阅读说明：本技术 处理铜冶炼过程中环集烟气的系统和方法 (System and method for treating flue gas collected in copper smelting process ) 是由 张小明 袁剑平 唐斌 刘旸 谢远根 于 2018-06-13 设计创作，主要内容包括：本发明公开了一种处理铜冶炼过程中环集烟气的系统和方法,系统包括：富氧侧吹熔炼炉、倾转溜槽和冰铜熔体储罐,富氧侧吹熔炼炉包括熔炼炉本体、铜精矿入口、二次风口、一次风口、熔炼渣出口、冰铜熔体出口和小渣室烟气出口,熔炼炉本体内限定出熔炼空间,熔炼空间包括反应区和熔池区,熔池区包括熔炼区和沉降区,熔炼区包括第一熔渣层和第一熔体层,沉降区包括第二熔渣层；铜精矿入口和二次风口在反应区；一次风口在第一熔渣层；熔炼渣出口和小渣室烟气出口在第二熔渣层；冰铜熔体出口在第一熔体层；倾转溜槽与熔炼渣出口相连,上方设第一烟罩；冰铜熔体储罐与冰铜熔体出口相连,上方设第二烟罩；第一烟罩和第二烟罩中的至少之一与二次风口相连。(The invention discloses a system and a method for treating collected flue gas in a copper smelting process, wherein the system comprises the following steps: the oxygen-enriched side-blown smelting furnace comprises a smelting furnace body, a copper concentrate inlet, a secondary air port, a primary air port, a smelting slag outlet, a matte melt outlet and a slag chamber flue gas outlet, wherein a smelting space is defined in the smelting furnace body, the smelting space comprises a reaction zone and a molten pool zone, the molten pool zone comprises a smelting zone and a settling zone, the smelting zone comprises a first slag layer and a first melt layer, and the settling zone comprises a second slag layer; the copper concentrate inlet and the secondary tuyere are arranged in the reaction zone; the primary tuyere is arranged on the first slag layer; the smelting slag outlet and the smoke outlet of the small slag chamber are arranged on the second smelting slag layer; the matte melt outlet is arranged on the first melt layer; the tilting chute is connected with a smelting slag outlet, and a first smoke hood is arranged above the tilting chute; the matte melt storage tank is connected with the matte melt outlet, and a second smoke hood is arranged above the matte melt storage tank; at least one of the first hood and the second hood is connected to the overfire air opening.)

1. A system for treating flue gas collected in a copper smelting process, comprising:

an oxygen-enriched side-blown smelting furnace comprising:

the smelting furnace comprises a smelting furnace body, wherein a smelting space is defined in the smelting furnace body, the smelting space comprises a reaction zone and a molten pool zone from top to bottom, the molten pool zone comprises a smelting zone and a settling zone which are horizontally arranged, the smelting zone comprises a first molten slag layer and a first molten slag layer from top to bottom, the settling zone comprises a second molten slag layer and a second molten slag layer from top to bottom, a baffle is arranged between the first molten slag layer and the second molten slag layer, a distance exists between the bottom end of the baffle and the first molten slag layer, and the first molten slag layer is communicated with the second molten slag layer;

a copper concentrate inlet, said copper concentrate inlet being disposed in said reaction zone;

the secondary air port is arranged in the reaction zone;

the primary tuyere is arranged on the first slag layer;

a smelting slag outlet, wherein the smelting slag outlet is arranged on the second smelting slag layer;

the matte melt outlet is arranged on the first melt layer;

the small slag chamber flue gas outlet is arranged on the second slag layer;

one end of the tilting chute is connected with the smelting slag outlet, and a first smoke hood is arranged above the tilting chute;

the matte melt storage tank is connected with the matte melt outlet, and a second smoke hood is arranged above the matte melt storage tank;

wherein at least one of the first hood and the second hood is connected to the overfire air opening.

2. The system of claim 1, comprising a plurality of said secondary tuyeres horizontally spaced apart in said reaction zone.

3. A system according to claim 2 further comprising a secondary air duct including a secondary air main connected to at least one of the first hood and the second hood and a secondary air branch connected to the secondary air opening.

4. The system of claim 3, wherein the secondary air manifolds are arranged in one-to-one correspondence with the secondary air ports.

5. A system according to claim 3 or 4, wherein the main overfire air duct and the branch overfire air duct are provided with shut-off valves.

6. The system of claim 1, further comprising:

the third smoke hood is arranged above the smelting slag outlet;

and the acid making device is respectively connected with the third smoke hood and the small slag chamber smoke outlet.

7. The system of claim 6, further comprising:

and one end of the flue gas main pipe is respectively connected with the third smoke hood and the small slag chamber flue gas outlet, and the other end of the flue gas main pipe is connected with the acid making device.

8. The system of claim 1, further comprising:

the slag ladle is connected with the other end of the tilting chute, and a fourth smoke hood is arranged above the slag ladle;

and the desulphurization device is connected with the fourth smoke hood.

9. A method for processing flue gas collected in a copper smelting process by using the system according to any one of claims 1 to 8, characterized in that copper concentrate, primary air and secondary air are supplied to the oxygen-enriched side-blown smelting furnace for smelting processing, so as to obtain smelting slag, matte melt and small slag chamber flue gas, the smelting slag is output through the tilting chute, the flue gas above the tilting chute is collected by the first hood, the matte melt is stored by the matte melt storage tank, and the flue gas above the matte melt storage tank is collected by the second hood, and the flue gas in the first hood and/or the flue gas in the second hood are supplied to the oxygen-enriched side-blown smelting furnace for use as secondary air.

10. The method of claim 9, further comprising: and supplying the smoke in the third smoke hood and the small slag chamber smoke to the acid making device for acid making treatment.

11. The method of claim 9, further comprising: the smelting slag is supplied to the slag ladle through the tilting chute, and the flue gas in the fourth smoke hood above the slag ladle is supplied to the desulfurization device for desulfurization treatment.

Technical Field

The invention belongs to the field of flue gas treatment, and particularly relates to a system and a method for treating collected flue gas in a copper smelting process.

Background

Sulfur dioxide is a major atmospheric pollutant in copper smelting. In oxygen-enriched side-blown smelting, sulfur dioxide can escape into the air when the melt is poured out of the smelting furnace, thus harming the health of operators, acidifying and corroding the surrounding environment and buildings. Therefore, it is necessary to perform a ring-set treatment of these escaping fumes. However, the traditional annular collection flue gas treatment process sends all annular collection flue gas after annular collection treatment to an annular collection desulfurization system for treatment, and the annular collection flue gas has large quantity, more impurities, large sulfur dioxide concentration fluctuation and higher treatment cost.

Meanwhile, in the oxygen-enriched side-blown smelting process, part of sulfides in the copper concentrate react with the primary smelting air to release a large amount of heat, so that the other part of high-valence sulfides in the copper concentrate is heated and decomposed to generate elemental sulfur (monomer sulfur). After the monomer sulfur is volatilized along with the flue gas, the monomer sulfur can be separated along with the temperature reduction in the sulfuric acid purification process. The monomer sulfur has high viscosity and is easy to adhere to an intercooler in a purification process, so that the normal production of equipment is hindered. Therefore, secondary air needs to be introduced in the oxygen-enriched side-blown smelting process, and oxygen in the secondary air is utilized to perform chemical reaction with the monomer sulfur to eliminate the monomer sulfur. However, the introduction of the secondary air requires the provision of a secondary air blower, which increases the production equipment and energy costs.

Therefore, the existing technology for treating the smoke collected in the copper smelting process needs to be further improved.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. To this end, it is an object of the present invention to propose a system and a method for treating the flue gases collected in a copper smelting process. The system cancels the use of a secondary air blower, remarkably reduces the flue gas treatment capacity of the desulfurization device, effectively utilizes partial sulfur dioxide of the circularly collected flue gas to prepare acid, reduces the equipment cost and the energy consumption, and has remarkable economic benefit.

In one aspect of the invention, the invention provides a system for treating flue gases collected in a copper smelting process, the system comprising, in accordance with an embodiment of the invention:

an oxygen-enriched side-blown smelting furnace comprising:

the smelting furnace comprises a smelting furnace body, wherein a smelting space is defined in the smelting furnace body, the smelting space comprises a reaction zone and a molten pool zone from top to bottom, the molten pool zone comprises a smelting zone and a settling zone which are horizontally arranged, the smelting zone comprises a first molten slag layer and a first molten slag layer from top to bottom, the settling zone comprises a second molten slag layer and a second molten slag layer from top to bottom, a baffle is arranged between the first molten slag layer and the second molten slag layer, a distance exists between the bottom end of the baffle and the first molten slag layer, and the first molten slag layer is communicated with the second molten slag layer;

a copper concentrate inlet, said copper concentrate inlet being disposed in said reaction zone;

the secondary air port is arranged in the reaction zone;

the primary tuyere is arranged on the first slag layer;

a smelting slag outlet, wherein the smelting slag outlet is arranged on the second smelting slag layer;

the matte melt outlet is arranged on the first melt layer;

the small slag chamber flue gas outlet is arranged on the second slag layer;

one end of the tilting chute is connected with the smelting slag outlet, and a first smoke hood is arranged above the tilting chute;

the matte melt storage tank is connected with the matte melt outlet, and a second smoke hood is arranged above the matte melt storage tank;

wherein at least one of the first hood and the second hood is connected to the overfire air opening.

According to the system for treating the collected flue gas in the copper smelting process, the concentration of sulfur dioxide in the flue gas collected by the first smoke hood above the tilting chute and the concentration of sulfur dioxide in the flue gas collected by the second smoke hood above the matte melt storage tank are low, so that the flue gas collected by the first smoke hood above the tilting chute and/or the flue gas collected by the second smoke hood above the matte melt storage tank can be reused as secondary air for the enriched side-blown smelting furnace, oxygen in the flue gas collected by the first smoke hood and/or the second smoke hood is fully utilized to react with the monomer sulfur generated by decomposition of part of high-valence sulfides in the copper concentrate in the enriched side-blown smelting furnace to eliminate the monomer sulfur, and compared with the prior art, a secondary air blower needs to be arranged when the secondary air is introduced, the use of the secondary air blower can be omitted, the purchase and operation costs of equipment are reduced, and the energy consumption is reduced. Meanwhile, because of recycling the part of the flue gas, the flue gas treatment capacity of a subsequent desulphurization device is remarkably reduced, and the treatment cost of flue gas desulphurization is reduced. Therefore, the invention provides a traditional transformation process for treating the circular flue gas of the enrichment side-blown smelting furnace, no additional equipment is required, the transformation difficulty is small, the investment cost is low, the operability is strong, and the effect is obvious.

In addition, the system for treating the collected flue gas in the copper smelting process according to the embodiment of the invention can also have the following additional technical characteristics:

in some embodiments of the invention, a plurality of the secondary tuyeres are included, the plurality of secondary tuyeres being horizontally spaced apart in the reaction zone. Therefore, the method is beneficial to improving the removal rate and the removal effect of the sulfur monomer in the oxygen-enriched side-blown smelting furnace.

In some embodiments of the present invention, the system for treating ring-up flue gas in a copper smelting process described above further includes a secondary air duct including a main secondary air duct and a branch secondary air duct connected to at least one of the first hood and the second hood, the branch secondary air duct being connected to the secondary air opening. Therefore, the use of the secondary air blower can be eliminated.

In some embodiments of the present invention, the secondary air branch pipes are arranged in one-to-one correspondence with the secondary air ports. Therefore, secondary air in the secondary air main pipe can be uniformly delivered into the oxygen-enriched side-blown smelting furnace.

In some embodiments of the invention, the secondary air main pipe and the secondary air branch pipe are provided with cut-off valves. Therefore, the secondary air quantity introduced into the oxygen-enriched side-blown smelting furnace is favorably adjusted.

In some embodiments of the present invention, the above system for treating flue gas collected in a copper smelting process further comprises: the third smoke hood is arranged above the smelting slag outlet; and the acid making device is respectively connected with the third smoke hood and the small slag chamber smoke outlet. Therefore, the recycling of the smoke in the third smoke hood and the smoke in the small slag chamber can be realized, and the production benefit is improved.

In some embodiments of the present invention, the above system for treating flue gas collected in a copper smelting process further comprises: and one end of the flue gas main pipe is respectively connected with the third smoke hood and the small slag chamber flue gas outlet, and the other end of the flue gas main pipe is connected with the acid making device. Therefore, the recovery efficiency of the third smoke hood smoke and the small slag chamber smoke is improved.

In some embodiments of the present invention, the above system for treating flue gas collected in a copper smelting process further comprises: the slag ladle is connected with the other end of the tilting chute, and a fourth smoke hood is arranged above the slag ladle; and the desulphurization device is connected with the fourth smoke hood. Therefore, the desulfurization treatment of the flue gas in the fourth smoke hood can be realized.

In a further aspect of the invention, the invention provides a method for treating flue gas collected in a copper smelting process, which is implemented by using the above system for treating flue gas collected in a copper smelting process, and according to an embodiment of the invention, the method comprises the following steps:

supplying copper concentrate, primary air and overgrate air to smelt in the oxygen-enriched side-blown smelting furnace to carry out smelting treatment so as to obtain smelting slag, copper matte melt and small slag chamber flue gas, the smelting slag passes through the chute that verts outputs, and the flue gas that verts the chute top is collected by first petticoat pipe, the copper matte melt by copper matte melt storage tank stores, and the flue gas that copper matte melt storage tank top is collected by the second petticoat pipe, and with the flue gas in the first petticoat pipe and/or the flue gas in the second petticoat pipe supply to use as the overgrate air in the oxygen-enriched side-blown smelting furnace.

According to the method for treating the collected flue gas in the copper smelting process, the concentration of sulfur dioxide in the flue gas collected by the first smoke hood above the tilting chute and the concentration of sulfur dioxide in the flue gas collected by the second smoke hood above the matte melt storage tank are low, so that the flue gas collected by the first smoke hood above the tilting chute and/or the flue gas collected by the second smoke hood above the matte melt storage tank can be reused as secondary air for the enriched side-blown smelting furnace, oxygen in the flue gas collected by the first smoke hood and/or the second smoke hood is fully utilized to react with the monomer sulfur generated by decomposition of part of high-valence sulfides in the copper concentrate in the enriched side-blown smelting furnace to eliminate the monomer sulfur, and compared with the prior art, a secondary air blower needs to be arranged when the secondary air is introduced, the use of the secondary air blower can be omitted, the purchasing and operating costs of equipment are reduced, and the energy consumption is reduced. Meanwhile, because of recycling the part of the flue gas, the flue gas treatment capacity of a subsequent desulphurization device is remarkably reduced, and the treatment cost of flue gas desulphurization is reduced. Therefore, the invention provides a traditional transformation process for treating the circular flue gas of the enrichment side-blown smelting furnace, no additional equipment is required, the transformation difficulty is small, the investment cost is low, the operability is strong, and the effect is obvious.

In addition, the method for treating the collected flue gas in the copper smelting process according to the embodiment of the invention also has the following additional technical characteristics:

in some embodiments of the present invention, the method for treating flue gas collected in a copper smelting process further comprises: and supplying the smoke in the third smoke hood and the small slag chamber smoke to the acid making device for acid making treatment. Therefore, the recycling of the smoke in the third smoke hood and the smoke in the small slag chamber can be realized, and the production benefit is improved.

In some embodiments of the present invention, the method for treating flue gas collected in a copper smelting process further comprises: the smelting slag is supplied to the slag ladle through the tilting chute, and the flue gas in the fourth smoke hood above the slag ladle is supplied to the desulfurization device for desulfurization treatment. Therefore, the desulfurization treatment of the flue gas in the fourth smoke hood can be realized.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic structural view of a system for treating flue gas collected in a copper smelting process according to one embodiment of the present invention;

FIG. 2 is a schematic structural view of a system for treating an exhaust gas collected during a copper smelting process according to yet another embodiment of the present invention;

FIG. 3 is a schematic structural view of a system for treating an accumulation flue gas in a copper smelting process according to yet another embodiment of the present invention;

FIG. 4 is a schematic structural view of a system for treating flue gas collected in a copper smelting process according to yet another embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In one aspect of the invention, the invention provides a system for treating flue gases collected in a copper smelting process, according to an embodiment of the invention, with reference to fig. 1-2, the system comprising: an oxygen-enriched side-blown smelting furnace 100, a tilting chute 200 and a matte melt storage tank 300.

According to an embodiment of the present invention, the oxygen-rich side-blown smelting furnace 100 includes: the smelting furnace comprises a smelting furnace body 11, a copper concentrate inlet 101, a secondary tuyere 102, a primary tuyere 103, a smelting slag outlet 104, a matte melt outlet 105 and a slag chamber flue gas outlet 106.

According to an embodiment of the invention, a smelting space 12 is defined in a smelting furnace body 11, the smelting space 12 comprises a reaction zone 13 and a molten bath zone 14 from top to bottom, the molten bath zone 14 comprises a smelting zone 15 and a settling zone 16 which are horizontally arranged, the smelting zone 15 comprises a first molten slag layer 151 and a first molten slag layer 152 from top to bottom, the settling zone 16 comprises a second molten slag layer 161 and a second molten slag layer 162 from top to bottom, a baffle 17 is arranged between the first molten slag layer 151 and the second molten slag layer 161, the bottom end of the baffle 17 is spaced from the first molten slag layer 152, the first molten slag layer 152 is communicated with the second molten slag layer 162, a copper concentrate inlet 101 and a secondary tuyere 102 are arranged in the reaction zone 13, a primary tuyere 103 is arranged in the first molten slag layer 151, a molten slag outlet 104 is arranged in the second molten slag layer 161, an ice copper melt outlet 105 is arranged in the first molten slag layer 152, a small slag chamber flue gas outlet 106 is arranged in the second molten slag layer 161, and is suitable for carrying out smelting treatment on the copper concentrate under the action of primary air and secondary air so as to obtain smelting slag, a matte melt and small slag chamber flue gas. In the smelting process of the copper concentrate, slag floats on the copper concentrate, the obtained melt is in the lower layer, and primary air is introduced into the first slag layer to ensure that the copper concentrate which is not completely reacted in the first slag layer continuously reacts, so that the amount of the obtained matte melt is increased. Along with the reaction, the smelting slag in the first slag layer after reacting with the primary air enters the second slag layer, and is discharged out of the oxygen-enriched side-blown smelting furnace through a smelting slag outlet, and the obtained melt is discharged out through a matte melt outlet. Through set up the baffle that there is the distance with first fuse-element layer in bottom between first fuse-element layer and second fuse-element layer, can realize that the smelting slag in the first fuse-element layer enters into the second fuse-element layer through the baffle lower extreme after further reacting with the air, realizes going forward of reaction, guarantees simultaneously that copper concentrate smelts fully as far as possible.

According to one embodiment of the present invention, a plurality of secondary tuyeres 102 may be included and horizontally spaced apart in the reaction zone. Preferably, a plurality of secondary tuyeres may be arranged at even intervals on the water level in the reaction zone. Therefore, secondary air introduced into the oxygen-enriched side-blown smelting furnace through the secondary air port can be ensured to be more uniform, so that the efficiency and the effect of removing the monomer sulfur in the reaction zone are higher.

According to a further embodiment of the present invention, the system for treating flue gases collected in a copper smelting process further comprises a secondary air duct (not shown). The secondary air pipe comprises a secondary air main pipe (not shown) and a secondary air branch pipe (not shown) which are connected, the secondary air main pipe is connected with at least one of the first smoke hood and the second smoke hood, and the secondary air branch pipe is connected with the secondary air opening. Therefore, the smoke in the first smoke hood and/or the smoke in the second smoke hood can be conveyed to the oxygen-enriched side-blown smelting furnace through the secondary air port after being divided by the secondary air branch pipe through the secondary air main pipe. It should be noted that there are a plurality of secondary air branch pipes, the diameters of the plurality of secondary air branch pipes may be the same or different, and the flue gas in the first smoke hood and/or the second smoke hood is shunted from the secondary air main pipe and enters the secondary air branch pipes, and then enters the oxygen-enriched side-blown smelting furnace through the secondary air port. According to one embodiment of the invention, the secondary air branch pipes are arranged in one-to-one correspondence with the secondary air ports. Therefore, the smoke in the first smoke hood and/or the second smoke hood can be uniformly sent to the oxygen-enriched side-blown smelting furnace, and the removal rate and the removal effect of the monomer sulfur in the oxygen-enriched side-blown smelting furnace are improved.

According to a further embodiment of the invention, shut-off valves (not shown) are provided on the main overfire air duct and the branch overfire air ducts. Specifically, only one shut-off valve can be arranged on the secondary air main pipe, and the supply and the shut-off of the smoke are realized by controlling the shut-off valve; the stop valves can be only arranged on the secondary air branch pipes, and the opening and the closing of each secondary air branch pipe can be selected by controlling the stop valves on the secondary air branch pipes, so that the direction and the flow of secondary air entering the oxygen-enriched side-blown smelting furnace are adjusted.

According to an embodiment of the present invention, one end of the tilt chute 200 is connected to the slag outlet 104, and the first hood 21 is provided above the tilt chute 200. The matte melt storage tank 300 is connected with the matte melt outlet 105, and a second smoke hood 31 is arranged above the matte melt storage tank 300. Wherein at least one of the first hood 21 and the second hood 31 is connected to the secondary air opening 102. The utility model discloses a smelting slag, including the rotation chute, the rotation chute is equipped with. The matte fuse-element that oxygen boosting side blown smelting furnace gained is sent to matte fuse-element storage tank and is stored after matte fuse-element export discharge, also can take a lot of flue gases this moment out, can collect the flue gas of matte fuse-element storage tank top through the second petticoat pipe that sets up in matte fuse-element storage tank top, and the sulfur dioxide's of this part flue gas concentration is lower, also can the reuse in oxygen boosting side blown smelting furnace as the overgrate air and use equally. It should be noted that the flue gas in the first smoke hood and the flue gas in the second smoke hood can be respectively used as secondary air to be recycled in the oxygen-enriched side-blown smelting furnace, and the two parts of flue gas can be mixed and then recycled in the oxygen-enriched side-blown smelting furnace.

According to the system for treating the collected flue gas in the copper smelting process, the concentration of sulfur dioxide in the flue gas collected by the first smoke hood above the tilting chute and the concentration of sulfur dioxide in the flue gas collected by the second smoke hood above the matte melt storage tank are low, so that the flue gas collected by the first smoke hood above the tilting chute and/or the flue gas collected by the second smoke hood above the matte melt storage tank can be reused as secondary air for the enriched side-blown smelting furnace, oxygen in the flue gas collected by the first smoke hood and/or the second smoke hood is fully utilized to react with the monomer sulfur generated by decomposition of part of high-valence sulfides in the copper concentrate in the enriched side-blown smelting furnace to eliminate the monomer sulfur, and compared with the prior art, a secondary air blower needs to be arranged when the secondary air is introduced, the use of the secondary air blower can be omitted, the purchase and operation costs of equipment are reduced, and the energy consumption is reduced. Meanwhile, because of recycling the part of the flue gas, the flue gas treatment capacity of a subsequent desulphurization device is remarkably reduced, and the treatment cost of flue gas desulphurization is reduced. Therefore, the invention provides a traditional transformation process for treating the circular flue gas of the enrichment side-blown smelting furnace, no additional equipment is required, the transformation difficulty is small, the investment cost is low, the operability is strong, and the effect is obvious.

According to an embodiment of the invention, referring to fig. 3, the system for treating the collected flue gas in the copper smelting process further comprises a third hood 41 and an acid making device 400, wherein the third hood 41 is arranged above the smelting slag outlet 104, and the acid making device 400 is respectively connected with the third hood 41 and the small slag chamber flue gas outlet 106 and is suitable for carrying out acid making treatment on the flue gas in the third hood and the small slag chamber flue gas. The concentration of the sulfur dioxide in the flue gas at the position of the smelting slag outlet is higher, and the flue gas can be used for preparing acid after being collected by the third smoke hood. The sulfur dioxide concentration of the small slag chamber flue gas is also higher, and the small slag chamber flue gas can be used for preparing acid. The two flue gases are used for preparing acid, so that the economic benefit of an enterprise can be obviously improved. According to an embodiment of the invention, the system for treating the collected flue gas in the copper smelting process further comprises a flue gas main pipe, one end of the flue gas main pipe is respectively connected with the third smoke hood and the small slag chamber flue gas outlet, and the other end of the flue gas main pipe is connected with the acid making device. Therefore, the acid making of the smoke in the third smoke hood and the smoke in the small slag chamber can be realized more conveniently, and the economic benefit of an enterprise is improved.

According to an embodiment of the invention, referring to fig. 4, the system for processing the collected flue gas in the copper smelting process further comprises a plurality of slag ladles 500 and a desulphurization device 600, wherein the slag ladles 500 are connected with the other end of the tilting chute 200, a fourth smoke hood 51 is arranged above the slag ladles 500, and the desulphurization device 600 is connected with the fourth smoke hood 51 and is suitable for feeding the flue gas in the fourth smoke hood above the slag ladles into the desulphurization device for desulphurization treatment. Concretely, the smelting slag is transferred to the cinder ladle through the chute that verts, trades another cinder ladle after a cinder ladle fills with, and the sulfur dioxide's of the flue gas of cinder ladle top concentration is low, can carry out desulfurization treatment after fourth petticoat pipe is collected, and flue gas after desulfurization treatment can directly be arranged outward after up to standard. Compared with the existing scheme of desulfurization treatment after all the flue gas is circularly collected, the flue gas volume of desulfurization treatment in the scheme of the application is obviously reduced, the concentration fluctuation of sulfur dioxide is small, and the treatment cost is low. The inventor finds that the concentration of sulfur dioxide in the flue gas at the two positions is the highest because the smelting slag outlet and the small slag chamber are directly connected with the furnace body; when the smelting slag flows into the tilting chute through the fixed slag chute, an interaction reaction occurs, so that the concentration of sulfur dioxide in the smoke in the first smoke hood is inferior, and the concentration of sulfur dioxide in the smoke in the second smoke hood is almost the same as that of the smoke in the first smoke hood; flue gas among the fourth petticoat pipe, because of the sulfur dioxide that contains in it volatilizees out from the smelting slag, and the petticoat pipe is in the cinder ladle top, and is not confined to can sneak into a large amount of air in resulting in the flue gas, and then make the sulfur dioxide concentration of flue gas minimum among the fourth petticoat pipe. Namely, the farther from the oxygen-rich side-blown smelting furnace in the process, the lower the concentration of sulfur dioxide contained in the flue gas.

In a further aspect of the invention, the invention provides a method for treating flue gas collected in a copper smelting process, which is implemented by using the above system for treating flue gas collected in a copper smelting process, and according to an embodiment of the invention, the method comprises the following steps:

s100: supplying the smoke in the first smoke hood and/or the smoke in the second smoke hood to the oxygen-enriched side-blown smelting furnace to be used as secondary air

In the step, specifically, copper concentrate, primary air and secondary air are supplied to an oxygen-enriched side-blown smelting furnace for smelting treatment, so that smelting slag, a matte melt and smoke of a small slag chamber are obtained, the smelting slag is output through a tilting chute, the smoke above the tilting chute is collected by a first smoke hood, the matte melt is stored by a matte melt storage tank, the smoke above the matte melt storage tank is collected by a second smoke hood, and then the smoke in the first smoke hood and/or the smoke in the second smoke hood are supplied to the oxygen-enriched side-blown smelting furnace for use as the secondary air. The inventor finds that the concentration of sulfur dioxide in the flue gas in the first smoke hood and the second smoke hood is low, the oxygen content is high, therefore, the flue gas in the first smoke hood and/or the flue gas in the second smoke hood can be reused as secondary air in an oxygen-enriched side-blown smelting furnace, the amount of the flue gas subjected to subsequent desulphurization treatment is remarkably reduced, the cost of the subsequent desulphurization treatment is reduced, and meanwhile, compared with the prior art, the use of a secondary air blower can be eliminated, and the cost of equipment purchasing and equipment operation is reduced.

According to the method for treating the collected flue gas in the copper smelting process, the concentration of sulfur dioxide in the flue gas collected by the first smoke hood above the tilting chute and the concentration of sulfur dioxide in the flue gas collected by the second smoke hood above the matte melt storage tank are low, so that the flue gas collected by the first smoke hood above the tilting chute and/or the flue gas collected by the second smoke hood above the matte melt storage tank can be reused as secondary air for the enriched side-blown smelting furnace, oxygen in the flue gas collected by the first smoke hood and/or the second smoke hood is fully utilized to react with the monomer sulfur generated by decomposition of part of high-valence sulfides in the copper concentrate in the enriched side-blown smelting furnace to eliminate the monomer sulfur, and compared with the prior art, a secondary air blower needs to be arranged when the secondary air is introduced, the use of the secondary air blower can be omitted, the purchasing and operating costs of equipment are reduced, and the energy consumption is reduced. Meanwhile, because of recycling the part of the flue gas, the flue gas treatment capacity of a subsequent desulphurization device is remarkably reduced, and the treatment cost of flue gas desulphurization is reduced. Therefore, the invention provides a traditional transformation process for treating the circular flue gas of the enrichment side-blown smelting furnace, no additional equipment is required, the transformation difficulty is small, the investment cost is low, the operability is strong, and the effect is obvious.

According to an embodiment of the present invention, the method for treating the collected flue gas in the copper smelting process further comprises:

s200: the flue gas in the third smoke hood and the flue gas in the small slag chamber are supplied to an acid making device for acid making treatment

In the step, the smoke in the third smoke hood and the smoke in the small slag chamber are supplied to an acid making device for acid making treatment. The inventor finds that the sulfur dioxide concentration in the smoke in the third smoke hood and the smoke in the small slag chamber is higher, and the smoke can be used for acid making, so that the grading treatment of the smoke is achieved, the smoke at each position in the copper concentrate smelting process is fully utilized, the smoke quantity of the subsequent desulfurization treatment can be reduced, extra economic benefits can be brought to enterprises, and compared with the prior art, the effect is obvious.

According to an embodiment of the present invention, the method for treating the collected flue gas in the copper smelting process further comprises:

s300: the flue gas in the fourth smoke hood is supplied to a desulphurization device for desulphurization treatment

In the step, after the smelting slag is supplied to the slag ladle through the tilting chute, the flue gas in the fourth smoke hood above the slag ladle can be supplied to the desulfurization device for desulfurization treatment. Concretely, the smelting slag is transferred to the cinder ladle through the chute that verts, trades another cinder ladle after a cinder ladle fills with, and the sulfur dioxide's of the flue gas of cinder ladle top concentration is low, can carry out desulfurization treatment after fourth petticoat pipe is collected, and flue gas after desulfurization treatment can directly be arranged outward after up to standard. Compared with the existing scheme of desulfurization treatment after all the flue gas is circularly collected, the flue gas volume of desulfurization treatment in the scheme of the application is obviously reduced, the concentration fluctuation of sulfur dioxide is small, and the treatment cost is low. The inventor finds that the concentration of sulfur dioxide in the flue gas at the two positions is the highest because the smelting slag outlet and the small slag chamber are directly connected with the furnace body; when the smelting slag flows into the tilting chute through the fixed slag chute, an interaction reaction occurs, so that the concentration of sulfur dioxide in the smoke in the first smoke hood is inferior, and the concentration of sulfur dioxide in the smoke in the second smoke hood is almost the same as that of the smoke in the first smoke hood; flue gas among the fourth petticoat pipe, because of the sulfur dioxide that contains in it volatilizees out from the smelting slag, and the petticoat pipe is in the cinder ladle top, and is not confined to can sneak into a large amount of air in resulting in the flue gas, and then make the sulfur dioxide concentration of flue gas minimum among the fourth petticoat pipe. Namely, the farther from the oxygen-rich side-blown smelting furnace in the process, the lower the concentration of sulfur dioxide contained in the flue gas. It should be noted that the features and advantages of the above system for treating flue gas in a copper smelting process are also applicable to the method for treating flue gas in a copper smelting process, and are not described herein again.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.