阅读说明：本技术 一种从金属废料中强化还原回收铁的富氧侧吹炉 (Oxygen-enriched side-blown converter for recovering iron from metal waste through enhanced reduction ) 是由 孙佳震 祁栋 杜红兵 盛海燕 杨勇 于 2021-11-09 设计创作，主要内容包括：本发明公开了一种从金属废料中强化还原回收铁的富氧侧吹炉,属于熔池熔炼炉技术领域。它包括炉身,所述炉身内部通过铜水套分隔成水平并列的氧化段和还原段,炉身底部设有电热前床；所述氧化段底部高于还原段底部,炉身底部形成台阶状熔池；所述氧化段和还原段之间的铜水套上设有贯穿的溢流孔；所述还原段底部通过设置的流出口与电热前床连通。通过铜水套在炉身内部形成水平并列的氧化段和还原段,在同一个炉子中同时存在氧化气氛和还原气氛；在氧化段,完成原料辅料的分解和熔化；在还原段可造强还原气氛,能够进一步强化对铁废料中铁的还原回收；电热前床能够维持熔体温度,有效处理底部金属因结炉而导致死炉的问题。(The invention discloses an oxygen-enriched side-blown converter for recovering iron from metal waste through enhanced reduction, and belongs to the technical field of molten pool smelting furnaces. The furnace comprises a furnace body, wherein the interior of the furnace body is divided into an oxidation section and a reduction section which are horizontally parallel by a copper water jacket, and an electric heating front bed is arranged at the bottom of the furnace body; the bottom of the oxidation section is higher than that of the reduction section, and a step-shaped molten pool is formed at the bottom of the furnace body; a through overflow hole is formed in the copper water jacket between the oxidation section and the reduction section; the bottom of the reduction section is communicated with the electric heating forebed through an outflow port. Forming an oxidation section and a reduction section which are horizontally parallel by sleeving molten copper in the furnace body, wherein the oxidation atmosphere and the reduction atmosphere exist in the same furnace; in the oxidation section, the decomposition and melting of the raw materials and auxiliary materials are completed; strong reducing atmosphere can be created in the reduction section, and the reduction recovery of iron in the iron waste can be further enhanced; the electric heating fore bed can maintain the temperature of the melt, and effectively solves the problem that the bottom metal is dead due to furnace accretion.)

1. An oxygen-enriched side-blown converter for recovering iron from metal waste by forced reduction comprises a converter body and is characterized in that the interior of the converter body is divided into an oxidation section and a reduction section which are horizontally parallel by a copper water jacket, and the bottom of the converter body is provided with an electric heating front bed;

the top of the oxidation section is provided with an oxidation section charging hole, and the top of the reduction section is provided with a reduction section charging hole;

the bottom of the oxidation section is higher than that of the reduction section, and a step-shaped molten pool is formed at the bottom of the furnace body;

a through overflow hole is formed in the copper water jacket between the oxidation section and the reduction section;

the side surface of the oxidation section is provided with a plurality of oxidation section primary air ports, and the side surface of the reduction section is provided with a plurality of reduction section primary air ports, wherein the oxidation section primary air ports and the reduction section primary air ports are both lower than the overflow hole;

the bottom of the reduction section is communicated with an electric heating forehearth through an outflow port, the electric heating forehearth is a standing and settling section, a pig iron discharge port is arranged at the bottom of the electric heating forehearth, a slag discharge port is arranged at the end part of the electric heating forehearth, and the height of the slag discharge port is lower than that of an overflow hole.

2. An oxygen-enriched side-blown converter for the enhanced reduction recovery of iron from scrap metal as claimed in claim 1 wherein the side of said oxidation zone is provided with an oxidation zone secondary tuyere which is higher than the overflow port.

3. An oxygen-enriched side-blown converter for the enhanced reduction recovery of iron from scrap metal in accordance with claim 1 wherein the side walls of the oxidation and reduction stages are each formed by copper water jackets.

Technical Field

The invention relates to an oxygen-enriched side-blown converter for recovering iron from metal waste through enhanced reduction, and belongs to the technical field of molten pool smelting furnaces.

Background

An oxygen-enriched side-blown molten pool smelting furnace, called an oxygen-enriched side-blown furnace for short, mainly comprises a furnace hearth, a furnace body, a furnace top, a steel frame and the like. The furnace hearth is built by water-resistant materials, a furnace body is arranged above the furnace hearth, the interior of the furnace hearth is used as a molten pool, the furnace body is generally composed of a copper water jacket, and a steel frame is used for providing a supporting function. A layer of copper water jacket on the side surface of the furnace body is provided with a plurality of primary air ports for blowing oxygen-enriched air into the melt slag layer; a plurality of secondary air ports are arranged on the second layer of copper water jacket on the side surface of the furnace body and used for blowing a certain amount of air into the furnace so as to fully combust combustible components in the smoke; the water jackets above the three layers of copper water jackets and the furnace top are generally composed of steel water jackets, and the steel water jackets on the furnace top are not provided with a charging hole.

The raw materials and the fuel are uniformly mixed in proportion and are added from a charging hole at the top of the furnace through a conveying device, the materials entering the furnace fall into a molten pool after high temperature, a primary air port arranged on the side surface of a furnace body introduces oxygen-enriched compressed air into a melt slag layer, the melt of the materials violently rolls in the furnace under the stirring action of the oxygen-enriched compressed air, the smelting and oxidation slagging processes can be rapidly completed, and the generated slag and the melt are siphoned and discharged through a slag discharging hole.

The prior oxygen-enriched side-blown converter has the following defects: (1) the oxygen-enriched side-blown converter cannot form an oxidizing atmosphere and a reducing atmosphere in the converter at the same time, and can only form the oxidizing atmosphere and the reducing atmosphere in a plurality of times, so that the production efficiency is reduced, and the reducing environment is a weak reducing atmosphere and cannot form a strong reducing atmosphere; (2) the problem of furnace death caused by furnace accretion of the bottom metal is serious.

Therefore, the oxygen-enriched side-blown converter for recovering iron from metal waste through enhanced reduction is designed, the oxygen-enriched side-blown converter can simultaneously have oxidation and reduction atmospheres, the production efficiency is improved, and metal at the bottom of a furnace pool is not easy to form a converter.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the utility model provides an oxygen-enriched side-blown converter for recovering iron from metal waste by forced reduction, which solves the problems of low metal recovery production efficiency and easy furnace bonding of the existing oxygen-enriched side-blown converter.

The technical problem to be solved by the invention is realized by adopting the following technical scheme:

an oxygen-enriched side-blown converter for recovering iron from metal waste by forced reduction comprises a converter body, wherein the inside of the converter body is divided into an oxidation section and a reduction section which are horizontally arranged in parallel through a copper water jacket, and the bottom of the converter body is provided with an electric heating front bed;

the top of the oxidation section is provided with an oxidation section charging hole, and the top of the reduction section is provided with a reduction section charging hole;

the bottom of the oxidation section is higher than that of the reduction section, and a step-shaped molten pool is formed at the bottom of the furnace body;

a through overflow hole is formed in the copper water jacket between the oxidation section and the reduction section;

the side surface of the oxidation section is provided with a plurality of oxidation section primary air ports, and the side surface of the reduction section is provided with a plurality of reduction section primary air ports, wherein the oxidation section primary air ports and the reduction section primary air ports are both lower than the overflow hole;

the bottom of the reduction section is communicated with an electric heating forehearth through an outflow port, the electric heating forehearth is a standing and settling section, a pig iron discharge port is arranged at the bottom of the electric heating forehearth, a slag discharge port is arranged at the end part of the electric heating forehearth, and the height of the slag discharge port is lower than that of an overflow hole.

As a preferable example, the side surface of the oxidation section is provided with an oxidation section secondary air opening which is higher than the overflow hole.

As a preferred example, the side walls of the oxidation section and the reduction section are both formed by copper water jackets.

An oxidation section and a reduction section which are horizontally arranged in parallel are arranged in the furnace body, the bottom of the oxidation section is higher than the bottom of the reduction section, a step-shaped molten pool is formed at the bottom of the furnace body, an electric heating front bed is arranged at the bottom of the furnace body, and materials enter the electric heating front bed from the oxidation section and the reduction section in sequence.

And in the oxidation section, oxygen-enriched air is blown into the oxidation section molten pool from a primary air port of the oxidation section, the oxygen-enriched air wraps the added furnace burden to play a role of stirring, so that the melt is bubbled and expanded, a smelting reaction is carried out in the air port area of the oxidation section molten pool, the decomposition and melting of raw material and auxiliary materials are completed, and the material in a molten state overflows from the oxidation section molten pool of the previous stage through an overflow hole in the copper water jacket and enters the reduction section molten pool of the next stage.

And in the reduction section, nitrogen carries pulverized coal and blows the pulverized coal into a reduction section molten pool from a primary air port of the reduction section, the charged molten material and the reduced coal charged from a charging port of the upper reduction section are wrapped to play a role in stirring and reducing, the metal oxide is further reduced into metal under the action of carbon and carbon monoxide under the action of high temperature, and the metal phase and the slag phase are mixed together and flow into an electric heating forehearth through an outflow port of the reduction section.

The electric heating forehearth is heated by an electrode arranged in the electric heating forehearth, the temperature of a melt in a furnace body of the electric heating forehearth is maintained, so that a metal phase and a slag phase have time to stand and separate, produced pig iron is discharged from a pig iron discharge port at the bottom of the furnace, and slag is siphoned and discharged from a slag discharge port; the electric heating forehearth is also provided with a safety port, when the furnace is shut down, all furnace slag in the furnace can be discharged from a furnace slag discharge port, and all melt is discharged from the safety port.

The invention has the beneficial effects that:

(1) an oxidation section and a reduction section which are horizontally parallel are formed by sleeving molten copper in a furnace body, the oxidation atmosphere and the reduction atmosphere exist in the same furnace, and a charging opening is divided into an oxidation section charging opening and a reduction section charging opening, so that the oxidation section and the reduction section are distinguished from each other from the charging opening;

(2) bubbling and expanding the melt in the oxidation section, and carrying out smelting reaction in a tuyere area of a molten pool to finish the decomposition and melting of raw materials and auxiliary materials;

(3) in the reduction section, nitrogen is used as coal-carrying air to convey the pulverized coal, so that a strong reduction atmosphere is created, a stirring reduction effect is achieved, the metal oxide is further reduced into metal under the action of carbon and carbon monoxide under the high-temperature effect, and the reduction recovery of iron in the iron waste can be further enhanced;

(4) the electric heating forehearth can maintain the temperature of the melt, so that the metal phase and the slag phase have time to stand and separate, and the electric heating forehearth can supplement heating, thereby effectively solving the problem that the bottom metal causes furnace death due to furnace formation.

Drawings

FIG. 1 is a schematic side view of the interior of the present invention;

fig. 2 is a schematic top view of the interior of the present invention.

In the figure: the device comprises a furnace body 1, a copper water jacket 2, overflow holes 201, an oxidation section 3, an oxidation section charging hole 301, an oxidation section primary tuyere 302, an oxidation section secondary tuyere 303, a reduction section 4, a reduction section charging hole 401, a reduction section primary tuyere 402, an outflow hole 403, an electric heating front bed 5, a pig iron discharge hole 501, a slag discharge hole 502, electrodes 503, a material level line 6 and a metal phase and slag phase layer line 7.

Detailed Description

In order to make the technical means, the original characteristics, the achieved purpose and the efficacy of the invention easy to understand, the invention is further described with reference to the specific drawings.

Example 1

As shown in figures 1 and 2, the oxygen-enriched side-blown converter for recovering iron from metal waste by forced reduction comprises a furnace body 1, wherein the interior of the furnace body 1 is divided into an oxidation section 3 and a reduction section 4 which are horizontally arranged in parallel by a copper water jacket 2, and the bottom of the furnace body 1 is provided with an electric heating front bed 5;

the top of the oxidation section 3 is provided with an oxidation section feed inlet 301, and the top of the reduction section 4 is provided with a reduction section feed inlet 401;

the bottom of the oxidation section 3 is higher than the bottom of the reduction section 4, and a step-shaped molten pool is formed at the bottom of the furnace body 1;

a through overflow hole 201 is arranged on the copper water jacket 2 between the oxidation section 3 and the reduction section 4;

a plurality of oxidation section primary air ports 302 are arranged on the side surface of the oxidation section 3, a plurality of reduction section primary air ports 402 are arranged on the side surface of the reduction section 4, wherein the oxidation section primary air ports 302 and the reduction section primary air ports 402 are lower than the overflow holes 201; the primary tuyere 302 of the oxidation zone is positioned in the middle of the solution in the oxidation zone 3, and the primary tuyere 402 of the reduction zone is positioned in the middle of the solution in the reduction zone 4.

The bottom of the reduction section 4 is communicated with an electric heating forehearth 5 through an outflow port 403, the electric heating forehearth 5 is a standing and settling section, a pig iron discharge port 501 is arranged at the bottom of the electric heating forehearth 5, a slag discharge port 502 is arranged at the end part of the electric heating forehearth 5, and the height of the slag discharge port 502 is lower than that of the overflow hole 201.

The side walls of the oxidation section 3 and the reduction section 4 are both formed by copper water jackets 2.

Example 2

The side of the oxidation section 3 is provided with an oxidation section secondary air port 303, and the oxidation section secondary air port 303 is higher than the overflow hole 201. The other structure is the same as embodiment 1.

When the oxygen-enriched side-blown converter is in a working state, the material level line 6 is slightly higher than the height of the overflow hole 201, the material in a molten state in the oxidation section 3 overflows from the overflow hole 201 and enters the reduction section 4, the metal phase and the slag phase in the reduction section 4 flow into the electric heating forehearth 5 through the outflow hole 403 of the reduction section 4, and the metal phase and the slag phase are kept stand and layered in the electric heating forehearth 5 to form a metal phase and slag phase layering line 7.

A plurality of secondary air ports 303 of the oxidation section are arranged on the copper water jacket 2 on the side surface of the furnace body 1 and used for blowing a certain amount of air into the furnace so as to fully combust combustible components in the smoke.

The working principle is as follows:

an oxidation section 3 and a reduction section 4 which are horizontally arranged in parallel are arranged in a furnace body 1, the bottom of the oxidation section 3 is higher than the bottom of the reduction section 4, a step-shaped molten pool is formed at the bottom of the furnace body 1, an electric heating fore bed 5 is arranged at the bottom of the furnace body 1, and materials enter the electric heating fore bed 5 from the oxidation section 3 and the reduction section 4 in sequence. An oxidation section 3 and a reduction section 4 which are horizontally parallel are formed in a furnace body 1 through a copper water jacket 2, the same furnace has oxidation atmosphere and reduction atmosphere, the charging openings are divided into an oxidation section charging opening 301 and a reduction section charging opening 401, raw material auxiliary materials are normally added into the oxidation section charging opening 301, and reduced coal is added into the reduction section charging opening 401, so that the oxidation section 3 and the reduction section 4 are distinguished from the charging openings, and the reduction section 4 can use nitrogen as coal-carrying air to convey pulverized coal to strengthen the reduction atmosphere;

in the oxidation section 3, oxygen-enriched air is blown into a molten pool of the oxidation section 3 from a primary air port 302 of the oxidation section, the added furnace burden is wrapped, the stirring effect is achieved, the melt is bubbled and expanded, the smelting reaction is carried out in the air port area of the molten pool of the oxidation section 3, the decomposition and melting of raw materials and corresponding auxiliary materials are completed, and the materials in the molten state overflow from the molten pool of the oxidation section 3 in the previous step to enter the molten pool of the reduction section 4 in the next step through an overflow hole 201 in a copper water jacket 2.

And in the reduction section 4, nitrogen carries pulverized coal and is blown into a molten pool of the reduction section 4 from a primary tuyere 402 of the reduction section, the wrapped and added molten material and the reduced coal added from a feed inlet 401 of the upper reduction section play a role in stirring and reduction, metal oxides are further reduced into metal under the action of carbon and carbon monoxide under the action of high temperature, and the metal phase and slag phase are mixed together and flow into the electric heating forehearth 5 through an outflow opening 403 of the reduction section 4. And in the reduction section 4, nitrogen is used as coal-carrying air to convey the pulverized coal, so that a strong reduction atmosphere is created, a stirring reduction effect is achieved, the metal oxide is further reduced into metal under the action of carbon and carbon monoxide under the high-temperature effect, and the reduction recovery of iron in the iron waste can be further enhanced.

The electric heating forehearth 5 is heated by an electrode 503 arranged in the electric heating forehearth 5, the temperature of a melt in a furnace body of the electric heating forehearth 5 is maintained, so that a metal phase and a slag phase have time to stand and separate, produced pig iron is discharged from a pig iron discharge port 501 of the furnace bottom, and slag is siphoned and discharged from a slag discharge port 502; the electric heating forehearth 5 is also provided with a safety port, when the furnace is shut down, all slag in the furnace can be discharged from the slag discharge port 502, and all melt is discharged from the safety port. The electric heating fore bed 5 can maintain the temperature of the melt, so that the metal phase and the slag phase have time to stand and separate, and the electric heating fore bed 5 can supplement heating, thereby effectively solving the problem that the bottom metal is dead due to furnace formation; the method can carry out harmless, reduction and resource recovery treatment on the high-silicon flotation tailings (used as raw materials), wherein the high-silicon flotation tailings are tailings generated by directly cyaniding gold after precious metals are extracted by gold hydrometallurgy, and the tailings are remained after pyrite concentrate products are obtained by adopting a flotation process.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.