阅读说明：本技术 一种用于处理含固危险废物的焚烧装置及方法 (Incineration device and method for treating solid hazardous waste ) 是由 李亚辉 周明川 朱云峰 孙峰 徐伟 张婧 任君朋 于 2019-11-06 设计创作，主要内容包括：本发明公开了一种用于处理含固危险废物的焚烧装置,包括：燃烧室,其内壁设有耐火材料；燃烧室自上而下依次包含拱顶段、直筒段以及锥底段；直筒段两端分别与拱顶段和锥底段连通。喷嘴,其数量为一个且设置于拱顶段,用于向燃烧室中喷射浆体状的所述含固危险废物、燃料以及富氧气体。激冷室,其与燃烧室的锥底段连接处设有冷却单元；该激冷室内壁设有激冷辅助单元；该激冷室上部侧壁设有气相出口,底部设有液固排放口。本发明还公开了一种应用上述焚烧装置回收含固危险废物中金属元素的方法。本发明的装置及方法既可有效回收含固危险废物中的金属元素,又可实现安全环保的气体排放。(The invention discloses an incineration device for treating solid hazardous waste, comprising: a combustion chamber, the inner wall of which is provided with a refractory material; the combustion chamber sequentially comprises an arch top section, a straight cylinder section and a cone bottom section from top to bottom; two ends of the straight cylinder section are respectively communicated with the arch top section and the cone bottom section. And the nozzles are arranged on the crown section and are used for spraying the solid hazardous waste, the fuel and the oxygen-enriched gas into the combustion chamber in a slurry form. The cooling unit is arranged at the joint of the chilling chamber and the conical bottom section of the combustion chamber; the inner wall of the chilling chamber is provided with a chilling auxiliary unit; the side wall of the upper part of the chilling chamber is provided with a gas phase outlet, and the bottom of the chilling chamber is provided with a liquid-solid discharge port. The invention also discloses a method for recovering metal elements in solid hazardous waste by applying the incineration device. The device and the method can effectively recover the metal elements in the solid hazardous waste and realize safe and environment-friendly gas emission.)

1. An incineration device for treating solid hazardous waste, comprising:

a combustion chamber, the inner wall of which is provided with a refractory material; the combustion chamber sequentially comprises an arch top section, a straight cylinder section and a cone bottom section from top to bottom; two ends of the straight cylinder section are respectively communicated with the arch top section and the cone bottom section;

one nozzle in number and arranged on the crown section and used for spraying the solid hazardous waste, the fuel and the oxygen-enriched gas in a slurry state into the combustion chamber;

the cooling unit is arranged at the joint of the chilling chamber and the conical bottom section of the combustion chamber; the inner wall of the chilling chamber is provided with a chilling auxiliary unit; the side wall of the upper part of the chilling chamber is provided with a gas phase outlet, and the bottom of the chilling chamber is provided with a liquid-solid discharge port.

2. An incineration device for disposing of solid hazardous waste according to claim 1, characterised in that said nozzles are provided at the top of said arch section.

3. An incineration device for disposing of solid hazardous waste according to claim 2, characterised in that said nozzles project into said combustion chamber and are, in axial sequence from the inside outwards:

a first channel, in which an ignition gun is arranged;

a second passage for passing the fuel;

a third channel for introducing the solid hazardous waste in a slurry form;

and the fourth channel is used for introducing the oxygen-enriched gas.

4. An incineration device for treating solid hazardous waste according to any one of claims 1-3, characterised in that the cooling unit comprises a quench ring connected to a downcomer, which downcomer communicates at its upper end with the combustion chamber and at its lower end with the quench chamber.

5. An incineration device for treating solid hazardous waste according to any one of claims 1 to 3, characterised in that the quench auxiliary unit is a cooling jacket filled with cooling water, and a cooling water inlet is provided in the lower part of the side wall of the quench chamber.

6. An incineration device fwd for treating solid hazardous waste according to any one of claims 1-3, characterized in that a plurality of thermocouple ports are provided in the combustion chamber for mounting high temperature thermocouples for measuring and monitoring the temperature in the combustion chamber.

7. An incineration device for disposing of solid hazardous waste according to any one of claims 1-3, characterised in that the refractory material comprises, in order from the outside to the inside, a thermal barrier coating, a high temperature resistant layer and a corrosion resistant layer.

8. An incineration device for treating solid hazardous waste according to any one of claims 1 to 3, characterised in that the height of the straight cylinder section is 2-10 times the diameter of the combustion chamber.

9. A method for treating solid hazardous waste, characterized in that the method uses an incineration device according to any one of claims 1-8, comprising the steps of:

spraying the slurry-shaped solid hazardous waste, fuel and oxygen-enriched gas into a combustion chamber through a nozzle in an atomized state for combustion so as to carry out oxidation reaction;

the metal oxide and gas generated by the oxidation reaction are mixed with water sprayed from the cooling unit at the joint of the combustion chamber and the chilling chamber, the mixture flows to the chilling chamber along the downpipe, and the metal oxide is further cooled by the chilling auxiliary unit in the chilling chamber and then discharged from a liquid-solid discharge port;

and gas generated by the oxidation reaction is cooled by the chilling chamber and then discharged through the gas-phase outlet.

10. The method as claimed in claim 9, wherein the reaction temperature of the combustion chamber is 1100-.

11. The method for treating solid hazardous waste according to claim 9, wherein the slurry is prepared from solid hazardous waste, water and surfactant; the fuel is a gaseous fuel.

Technical Field

The invention relates to the technical field of harmless treatment of hazardous wastes, in particular to an incineration device and method for treating solid hazardous wastes.

Background

In recent years, the disposal of hazardous waste has become a hot topic throughout the world. Hazardous waste can cause serious environmental and ecological problems if not properly disposed. Meanwhile, most dangerous wastes contain noble metal elements, so that the method has a high recovery value. Therefore, the method has remarkable economic and social significance for correctly treating the solid hazardous waste and recovering the metal elements in the solid hazardous waste.

CN108341644A discloses a method for solidifying heavy metals in a waste catalyst, which comprises grinding the waste catalyst to form powder, wherein the waste catalyst contains heavy metals; mixing a curing agent, an admixture, an auxiliary agent, the waste catalyst powder and water to obtain a mixture; sealing and aging the mixture; and pressing and forming the aged mixture to obtain a green brick, and curing the green brick to obtain a baking-free brick containing heavy metals, so that the hazardous waste is cured. The method does not carry out harmless treatment on the hazardous waste.

CN108456781A discloses a method for recovering multi-metal solid waste by smelting in a high-temperature rotary kiln, which comprises the steps of mixing hazardous waste and anthracite, introducing the mixture into the rotary kiln for high-temperature smelting, performing harmless treatment such as flue gas treatment and kiln slag treatment, and then recovering metal by refining. Such a treatment method has the following problems: firstly, the rotary kiln has poor sealing performance and the phenomenon of pollutant escape exists; secondly, the burned product is slowly cooled in a natural cooling mode, the generation temperature interval of the dioxin is 200-500 ℃, and the combustion product generates the dioxin in the cooling process, so that the problem of secondary environmental pollution exists.

CN108546569A discloses an entrained flow gasifier and a gasification method, the content of methane in the synthesis gas produced by the entrained flow gasifier and the gasification method is further increased, and the specific coal consumption and the specific oxygen consumption are further reduced. However, the method is mainly used for generating synthesis gas by coal gasification and is not suitable for treating solid waste.

Therefore, there is a need for a treatment apparatus and method for hazardous waste that is both safe and effective in recovering metallic elements, thereby significantly improving economic and social value.

The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

Disclosure of Invention

The invention aims to provide an incineration device which can effectively treat solid hazardous waste and reduce the risk of secondary pollution, thereby overcoming the defect of low harmless treatment efficiency caused by improper treatment of the solid hazardous waste in the prior art.

Another object of the present invention is to provide a method for treating solid hazardous waste by using the incineration device, which can effectively recover the metal elements in the solid hazardous waste.

To achieve the above object, according to a first aspect of the present invention, there is provided an incineration apparatus for treating solid hazardous waste, the apparatus comprising: the inner wall of the combustion chamber is provided with a refractory material, the combustion chamber sequentially comprises an arch top section, a straight cylinder section and a cone bottom section from top to bottom, and two ends of the straight cylinder section are respectively communicated with the arch top section and the cone bottom section; the nozzles are arranged on the arch top section and are used for spraying the solid hazardous waste, the fuel and the oxygen-enriched gas into the combustion chamber in a slurry shape; the cooling unit is arranged at the joint of the chilling chamber and the conical bottom section of the combustion chamber; the inner wall of the chilling chamber is provided with a chilling auxiliary unit; the side wall of the upper part of the chilling chamber is provided with a gas phase outlet, and the bottom of the chilling chamber is provided with a liquid-solid discharge port.

Further, in the above technical solution, the nozzle may be disposed at the top of the arch top section.

Further, among the above-mentioned technical scheme, in the nozzle stretched into the combustion chamber, the nozzle can be set to along the axial from inside to outside in proper order and be: a first channel, in which an ignition gun is arranged; a second passage for introducing fuel; a third channel for introducing solid hazardous waste in the form of a slurry; and a fourth passage for introducing oxygen-enriched gas.

Further, in the above technical solution, the cooling unit may include a quench ring, the quench ring is connected to a downcomer, an upper end of the downcomer is communicated with the combustion chamber, and a lower end of the downcomer is communicated with the quench chamber.

Further, in the above technical solution, the chilling auxiliary unit may be a cooling jacket filled with cooling water, and the cooling water inlet is disposed at the lower portion of the sidewall of the chilling chamber.

Further, in the above technical scheme, a plurality of thermocouple interfaces can be arranged in the combustion chamber for installing high temperature thermocouples to measure and monitor the temperature in the combustion chamber.

Further, in the above technical scheme, the refractory material may be configured to include a thermal insulation coating, a high temperature resistant layer, and an abrasion resistant layer in sequence from outside to inside.

Further, in the above technical solution, the height of the straight cylinder section may be 2-10 times of the diameter of the combustion chamber.

According to a second aspect of the invention, there is provided a method of treating solid hazardous waste, the method using an incineration plant as hereinbefore described and comprising the steps of: spraying the slurry-shaped solid hazardous waste, fuel and oxygen-enriched gas into a combustion chamber through a nozzle in an atomized state for combustion so as to carry out oxidation reaction; the metal oxide and gas generated by the oxidation reaction are mixed with water sprayed from the cooling unit at the joint of the combustion chamber and the chilling chamber, the mixture flows to the chilling chamber along the downpipe, and the metal oxide is further cooled by the chilling auxiliary unit in the chilling chamber and then discharged from a liquid-solid discharge port; and gas generated by the oxidation reaction is cooled by the chilling chamber and then discharged through the gas-phase outlet.

Further, in the above technical scheme, the reaction temperature of the combustion chamber can be controlled to be 1100-.

Further, in the technical scheme, the slurry can be prepared from solid hazardous waste, water and a surfactant; the fuel may be a gaseous fuel.

Compared with the prior art, the invention has the following beneficial effects:

1) the invention adopts closed feeding and closed combustion, and can effectively prevent pollutants from escaping in the burning process by controlling the negative pressure in the furnace;

2) through the arrangement of the cooling unit, the combustion product can be quickly cooled to below 200 ℃ by adopting a water chilling mode, so that the generation of dioxin is fundamentally avoided, and the recovery rate of solid substances containing metal elements is improved; the cooling effect can be further improved through the arrangement of the chilling auxiliary unit, and the overtemperature in the furnace can be effectively avoided.

3) The fluidization mode is adopted, so that the incineration efficiency can be effectively improved on the premise of meeting the residence time of reactants;

4) the rotating equipment is few, the failure rate of the equipment is low, and the running cost can be effectively reduced.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood and to make the technical means implementable in accordance with the contents of the description, and to make the above and other objects, technical features, and advantages of the present invention more comprehensible, one or more preferred embodiments are described below in detail with reference to the accompanying drawings.

Drawings

FIG. 1 is a schematic view showing the construction of an incineration apparatus for treating solid hazardous waste according to the present invention.

Description of the main reference numerals:

1-upper shell, 10-combustion chamber, 11-arch top section, 110-refractory arch top section, 12-straight cylinder section, 120-refractory straight cylinder section, 13-cone bottom section, 130-refractory cone bottom section and 131-slag outlet;

2-lower shell, 20-chilling chamber, 201-gas phase outlet, 202-cooling water inlet, 203-liquid-solid discharge port and 204-cooling jacket;

3-a nozzle;

4-thermocouple interface;

5-a chilling ring;

6-a downcomer;

a-solid hazardous waste; b-fuel; c-oxygen-enriched gas.

Detailed Description

The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.

Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.

Spatially relative terms, such as "below," "lower," "upper," "above," "upper," and the like, may be used herein for ease of description to describe one element or feature's relationship to another element or feature in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the object in use or operation in addition to the orientation depicted in the figures. For example, if the items in the figures are turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the elements or features. Thus, the exemplary term "below" can encompass both an orientation of below and above. The article may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative terms used herein should be interpreted accordingly.

In this document, the terms "first", "second", etc. are used to distinguish two different elements or portions, and are not used to define a particular position or relative relationship. In other words, the terms "first," "second," and the like may also be interchanged with one another in some embodiments.

As shown in fig. 1, an incineration apparatus for treating solid hazardous waste according to an embodiment of the present invention is mainly composed of a nozzle 3 and an incinerator composed of a combustion chamber 10 and a quench chamber 20. The combustion chamber 10 is enclosed by an upper shell 1, the chilling chamber 20 is enclosed by a lower shell 2, and the upper shell and the lower shell are hermetically connected or integrally formed. The inner wall of the combustion chamber 10 is provided with refractory materials, and the combustion chamber 10 sequentially comprises an arch top section 11, a straight cylinder section 12 and a cone bottom section 13 from top to bottom. The two ends of the straight cylinder section 12 are respectively communicated with the arch top section 11 and the cone bottom section 13. The height of the straight barrel section 12 is 2 to 10 times, preferably 4 to 8 times, the diameter of the combustion chamber 10. Accordingly, each section of inner wall is provided with a refractory material, see refractory dome section 110, refractory cylinder section 120 and refractory cone bottom section 130 in fig. 1.

Further, in one or more exemplary embodiments of the present invention, the refractory material includes a thermal insulation coating, a high temperature resistant layer, and an abrasion resistant layer in order from the inner wall of the incineration furnace to the combustion chamber (i.e., from the outside to the inside).

Preferably, but not by way of limitation, in one or more exemplary embodiments of the invention, a plurality of thermocouple ports 4 are provided in the combustion chamber 10 for mounting high temperature thermocouples to measure and monitor the temperature within the combustion chamber 10.

As further shown in FIG. 1, the quench chamber 20 is located below the slag notch 131 of the combustion chamber 10, and a cooling unit is provided at the connection of the quench chamber 20 and the conical bottom section 13 of the combustion chamber 10. Preferably, but not limitatively, the cooling unit may employ a quench ring 5, the quench ring 5 being provided at the bottom of the cone bottom section 13. A downcomer 6 is connected below the quench ring 5. The upper end of the downcomer 6 communicates with the combustion chamber 10 through a slag outlet 131 and the lower end communicates with the quench chamber 20. The solid and gas generated by combustion from the combustion chamber 10 are mixed with atomized water sprayed from the chilling ring 5 at the joint of the combustion chamber 10 and the chilling chamber 20, flow to the chilling chamber 20 from the descending pipe 6, and the solid is discharged from a liquid-solid discharge port 203 at the bottom of the incinerator after the chilling chamber 20 is fully cooled. The side wall of the upper part of the chilling chamber 20 is provided with a gas phase outlet 201, and gas generated by combustion is discharged through the gas phase outlet 201 after being subjected to water bath in the chilling chamber 20 and is discharged after being subjected to subsequent treatment. The incinerator is under negative pressure, so that the escape of pollutants can be effectively avoided.

Further, in one or more exemplary embodiments of the present invention, in order to avoid the over-temperature of the quench chamber 20, a quench auxiliary unit may be disposed on the inner wall of the quench chamber 20, preferably but not limited to, a cooling jacket 204, and the quench auxiliary unit may be cooled by cooling water, which is injected through a cooling water inlet 202, and the cooled cooling water may be recycled or may be directly overflowed to the quench chamber 20. Preferably, but not by way of limitation, the cooling water inlet 202 is provided at a lower portion of the sidewall of the quench chamber 20. Of course, other cooling methods in the art may be used as long as they can assist in cooling the furnace.

Preferably, but not limitatively, in one or more exemplary embodiments of the present invention, in addition to the downcomer 6, a riser (not shown in the figure) may be provided outside the downcomer 6, which may effectively extend the cooling time and improve the cooling efficiency. A gas-collecting hood (not shown) may be provided at the bottom of the riser to effectively concentrate the gas.

As further shown in fig. 1, the embodiment of the present invention employs a single nozzle structure, and the nozzle 3 is provided at the dome section 11, preferably at the top of the dome section 11, for injecting the solid hazardous waste a, the fuel B and the oxygen-enriched gas C in the form of slurry into the combustion chamber 10. Slurry containing solid hazardous waste A, fuel B (gas fuel can be adopted) and oxygen-enriched gas C (air or oxygen-enriched air can be adopted) enter a nozzle 3, the nozzle 3 extends into a combustion chamber 10, the nozzle 3 is sequentially provided with a first channel, a second channel, a third channel and a fourth channel (the channels are not shown in the figure) from inside to outside along the axial direction, an ignition gun is arranged in the first channel, the second channel is used for introducing the fuel B, the third channel is used for introducing the slurry containing solid hazardous waste A, and the fourth channel is used for introducing the oxygen-enriched gas C. Different channels in the nozzle 3 are sprayed into a combustion chamber 10 of the incinerator from top to bottom, the slurry-shaped solid-containing hazardous waste A is fully atomized under the action of the shearing force of the oxygen-enriched gas C, and is fully mixed with the oxygen-enriched gas C and the fuel B to carry out combustion reaction, the combustion temperature is 1100-1500 ℃, the combustion pressure is-0.1-1 MPa, the retention time is more than 2s, and the oxygen concentration of the oxygen-enriched gas is 18-100 vol%.

The slurry solid hazardous waste A is prepared from solid hazardous waste, water and surfactant, the slurry, fuel and oxygen-enriched gas enter the incinerator after being atomized by the nozzle 3, and the nozzle 3 extends into the combustion chamber at the top of the incinerator and is sprayed from top to bottom. The nozzle 3 is provided with a plurality of channels from inside to outside along the axial direction, and the oxygen-enriched gas, the slurry and the fuel continuously enter, so that the uniform atomization of the slurry is ensured, and the slurry, the fuel and the oxygen-enriched gas are uniformly mixed.

The following examples 1-3 are device examples.

Example 1

Embodiment 1 employs a single nozzle configuration with the nozzle 3 disposed at the top of the dome section 11 for injecting copper-containing hazardous waste in slurry form, fuel, and oxygen-enriched air into the combustion chamber 10. The method comprises the following steps that slurry containing the copper hazardous waste, fuel (adopting gas fuel) and oxygen-enriched air enter a nozzle 3, the nozzle 3 extends into a combustion chamber 10, the nozzle 3 is sequentially provided with a first channel, a second channel, a third channel and a fourth channel from inside to outside along the axial direction, an ignition gun is arranged in the first channel, the second channel is used for introducing the fuel, the third channel is used for introducing the copper hazardous waste in the form of slurry, and the fourth channel is used for introducing the oxygen-enriched air. Different channels in the nozzle 3 are sprayed into a combustion chamber 10 of the incinerator from top to bottom, the slurry-shaped dangerous waste containing copper is fully atomized under the action of the shearing force of the oxygen-enriched air, and is fully mixed with the oxygen-enriched air and the fuel to carry out combustion reaction, the combustion temperature is 1150 ℃, the combustion pressure is-0.005 MPa, the retention time is 2.5s, and the oxygen concentration of the oxygen-enriched air is 21 volume percent.

After the hazardous waste containing copper is treated by the incineration device in the embodiment 1, the recovery rate of metal reaches about 95%, and the discharged gas meets the requirement of environmental protection.

Example 2

Embodiment 2 still adopts the single nozzle structure of embodiment 1, and the same parts are not described herein again, which is different from embodiment 1: the combustion temperature was 1200 ℃.

After the copper-containing hazardous waste is treated by the incineration device in the embodiment 2, the recovery rate of metal reaches about 96%, and the discharged gas meets the environmental protection requirement.

Example 3

Embodiment 3 still adopts the single nozzle structure of embodiment 1, and the same parts are not described herein again, which is different from embodiment 1: the combustion temperature was 1250 ℃.

After the hazardous waste containing copper is treated by the incineration device in the embodiment 3, the recovery rate of metal reaches about 97%, and the discharged gas meets the requirement of environmental protection.

In one or more embodiments of the method for treating solid hazardous waste of the present invention, as illustrated in FIG. 1, the method uses the specific incineration device described above and comprises the following steps: the solid hazardous waste A, the fuel B and the oxygen-enriched gas C in the form of slurry are sprayed into a combustion chamber in an atomized state through a nozzle 3 to be combusted for oxidation reaction. The slurry can be prepared from solid hazardous waste, water and surfactant, and the fuel can be gas fuel. The reaction temperature of the combustion chamber can be controlled at 1100-1500 ℃, the pressure can be controlled at-0.1-1 MPa, the retention time is more than 2s, and the oxygen concentration of the oxygen-enriched gas is controlled at 18-100% by volume. The metal oxide and gas generated by the oxidation reaction are mixed with water sprayed from the cooling unit at the joint of the combustion chamber 10 and the chilling chamber 20, the mixture flows to the chilling chamber 20 along the descending pipe 6, the metal oxide is further cooled by the chilling auxiliary unit in the chilling chamber 20 and then is discharged from the liquid-solid discharge port 203, and the gas generated by the oxidation reaction is cooled by the chilling chamber 20 and then is discharged through the gas-phase outlet 201.

The cooling unit can adopt the mode that the chilling ring 5 is connected with the descending pipe 6 in the device embodiment, and also can adopt the mode that the chilling ring 5 is connected with the descending pipe 6 and the ascending pipe; the chilling auxiliary unit can adopt a cooling jacket 204 mode to cool the furnace through cooling water. The cooling water sprayed by the chilling ring can quickly cool the metal oxide and the gas to below 200 ℃, so that the generation of dioxin can be avoided, and the secondary pollution is effectively avoided.

In addition, the solid hazardous waste a may be one or more of copper-containing hazardous waste, bismuth-containing hazardous waste, iron-containing hazardous waste, molybdenum-containing hazardous waste, zinc-containing hazardous waste, chromium-containing hazardous waste, beryllium-containing hazardous waste, and lead-containing hazardous waste. The fuel B is various fuels commonly used in the art, and may be, for example, natural gas, liquefied petroleum gas, fuel oil, etc., and preferably a gaseous fuel is used.

The surfactant may employ at least one of cationic surfactants, anionic surfactants, and zwitterionic and nonionic surfactants, which are conventional in the art. As the cationic surfactant, for example, alkyl ammonium salts, amino alcohol fatty acid derivatives and the like can be used. As the anionic surfactant, for example, alkylbenzenesulfonate, alpha-olefin sulfonate, phosphate ester and the like can be used. As the zwitterionic surfactant, for example, alanine or the like can be used. Examples of the nonionic surfactant include fatty acid amide derivatives and polyvalent alcohol derivatives.

The following examples 4-6 are process examples.

Example 4

Example 4 the incineration plant of the foregoing example 1 with a daily capacity of 10 tons of copper-containing hazardous waste was used and comprised the following steps: the copper-containing hazardous waste in the form of slurry, fuel and oxygen-enriched air are injected into the combustion chamber through the nozzle 3 in an atomized state to be combusted for carrying out oxidation reaction. The slurry is prepared from copper-containing hazardous waste, water and a surfactant, wherein the surfactant is alkyl ammonium salt, and the fuel is gas fuel. The reaction temperature of the combustion chamber is controlled at 1150 ℃, the pressure is controlled at-0.005 MPa, the residence time is 2.5s, and the oxygen concentration of the oxygen-enriched air is controlled at 21 percent by volume. The copper-containing oxide and gas generated by the oxidation reaction are mixed with water sprayed from the cooling unit at the joint of the combustion chamber 10 and the chilling chamber 20, the mixture flows to the chilling chamber 20 along the descending pipe 6, the copper-containing oxide is further cooled by the chilling auxiliary unit in the chilling chamber 20 and then is discharged from the liquid-solid discharge port 203, and the gas generated by the oxidation reaction is cooled by the chilling chamber 20 and then is discharged through the gas-phase outlet 201.

After the hazardous waste containing copper is treated by the method of the embodiment 4, the recovery rate of metal reaches about 95 percent, and the discharged gas meets the requirement of environmental protection.

Example 5

Embodiment 5 still adopts the method of embodiment 4, and the same parts are not described herein again, which is different from embodiment 4: the daily treatment capacity is 15 tons, and the reaction temperature of the combustion chamber is controlled to be about 1200 ℃.

After the hazardous waste containing copper is treated by the method of the embodiment 5, the recovery rate of metal reaches about 96 percent, and the discharged gas meets the requirement of environmental protection.

Example 6

Embodiment 6 still adopts the method of embodiment 4, and the same parts are not described herein again, which is different from embodiment 4: the daily treatment capacity is 20 tons, and the reaction temperature of the combustion chamber is controlled to be about 1250 ℃.

After the hazardous waste containing copper is treated by the method of the embodiment 6, the recovery rate of metal reaches about 97 percent, and the discharged gas meets the requirement of environmental protection.

The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. Any simple modifications, equivalent changes and modifications made to the above exemplary embodiments shall fall within the scope of the present invention.