CN116837214A - Method for treating zinc-copper-containing hazardous waste by using suspension magnetization roasting furnace - Google Patents
Method for treating zinc-copper-containing hazardous waste by using suspension magnetization roasting furnace Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 52
- 239000000725 suspension Substances 0.000 title claims abstract description 43
- 239000002920 hazardous waste Substances 0.000 title claims abstract description 42
- TVZPLCNGKSPOJA-UHFFFAOYSA-N copper zinc Chemical compound [Cu].[Zn] TVZPLCNGKSPOJA-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 230000005415 magnetization Effects 0.000 title claims description 24
- 239000000463 material Substances 0.000 claims abstract description 90
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 51
- 239000003546 flue gas Substances 0.000 claims abstract description 51
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 47
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000002893 slag Substances 0.000 claims abstract description 37
- 238000003723 Smelting Methods 0.000 claims abstract description 36
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000007789 gas Substances 0.000 claims abstract description 30
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 30
- 239000011701 zinc Substances 0.000 claims abstract description 30
- 238000002156 mixing Methods 0.000 claims abstract description 26
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052802 copper Inorganic materials 0.000 claims abstract description 22
- 239000010949 copper Substances 0.000 claims abstract description 22
- 230000004907 flux Effects 0.000 claims abstract description 19
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910052683 pyrite Inorganic materials 0.000 claims abstract description 17
- 239000011028 pyrite Substances 0.000 claims abstract description 17
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 17
- 239000000428 dust Substances 0.000 claims abstract description 10
- 239000004744 fabric Substances 0.000 claims abstract description 10
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 9
- 230000023556 desulfurization Effects 0.000 claims abstract description 9
- 230000009467 reduction Effects 0.000 claims description 60
- 230000008569 process Effects 0.000 claims description 21
- 238000001816 cooling Methods 0.000 claims description 16
- 238000003825 pressing Methods 0.000 claims description 15
- 238000009853 pyrometallurgy Methods 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000010791 quenching Methods 0.000 claims description 9
- 230000000171 quenching effect Effects 0.000 claims description 9
- 238000000498 ball milling Methods 0.000 claims description 8
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 8
- 125000000864 peroxy group Chemical group O(O*)* 0.000 claims description 8
- 239000002994 raw material Substances 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 4
- 230000018044 dehydration Effects 0.000 claims description 2
- 238000006297 dehydration reaction Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 238000002844 melting Methods 0.000 claims 1
- 230000008018 melting Effects 0.000 claims 1
- 239000000843 powder Substances 0.000 claims 1
- 239000002699 waste material Substances 0.000 abstract description 26
- 229910052751 metal Inorganic materials 0.000 abstract description 14
- 238000011084 recovery Methods 0.000 abstract description 14
- 239000002184 metal Substances 0.000 abstract description 13
- 239000007787 solid Substances 0.000 abstract description 4
- 238000005272 metallurgy Methods 0.000 abstract description 2
- 238000005266 casting Methods 0.000 abstract 1
- 239000013078 crystal Substances 0.000 abstract 1
- 238000001914 filtration Methods 0.000 abstract 1
- 238000012216 screening Methods 0.000 abstract 1
- 230000009471 action Effects 0.000 description 6
- 239000004615 ingredient Substances 0.000 description 6
- 230000007246 mechanism Effects 0.000 description 6
- 239000000155 melt Substances 0.000 description 6
- 238000004064 recycling Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 231100001261 hazardous Toxicity 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- 238000009854 hydrometallurgy Methods 0.000 description 2
- 239000002910 solid waste Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000011133 lead Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- -1 simultaneously Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/001—Dry processes
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/02—Roasting processes
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B15/00—Obtaining copper
- C22B15/0002—Preliminary treatment
- C22B15/001—Preliminary treatment with modification of the copper constituent
- C22B15/0013—Preliminary treatment with modification of the copper constituent by roasting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B15/00—Obtaining copper
- C22B15/0026—Pyrometallurgy
- C22B15/0028—Smelting or converting
- C22B15/003—Bath smelting or converting
- C22B15/0039—Bath smelting or converting in electric furnaces
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B19/00—Obtaining zinc or zinc oxide
- C22B19/20—Obtaining zinc otherwise than by distilling
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B19/00—Obtaining zinc or zinc oxide
- C22B19/30—Obtaining zinc or zinc oxide from metallic residues or scraps
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B4/00—Electrothermal treatment of ores or metallurgical products for obtaining metals or alloys
- C22B4/04—Heavy metals
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Metallurgy (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Organic Chemistry (AREA)
- Geology (AREA)
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Abstract
The invention relates to a method for treating zinc-copper-containing hazardous waste by using a suspension magnetizing roasting furnace, which belongs to the field of nonferrous metal metallurgy, and specifically comprises the steps of crushing, screening and press-filtering zinc-copper-containing solid hazardous waste materials, feeding the materials into the suspension magnetizing roasting furnace through a screw feeder, removing free water and crystal water from the materials in a preheating section of the suspension roasting furnace, reducing the materials, mixing the reduced gases containing zinc steam with a flux, and smelting the materials; adding silica and pyrite to regulate slag, and crushing slag produced after smelting into glassy harmless slag; and after the metallic phase copper matte is discharged, ingot casting is carried out, zinc-containing steam is cooled to form zinc powder for recovery, cooled flue gas is discharged after dust removal, desulfurization and denitrification treatment by a cloth bag, and dust collected by the cloth bag is returned to the suspension roasting furnace, so that no waste is discharged.
Description
Technical Field
The invention relates to the field of nonferrous metal metallurgy, in particular to a method for treating zinc-copper-containing hazardous waste by using a suspension magnetization roasting furnace.
Background
The nonferrous metal smelting industry in China has various processes, various waste types are generated, links are quite different, and the problems of unclear monitoring information of dangerous waste, such as difficult identification of waste generation nodes, unclear pointing of the waste types, unclear pollution characteristics and the like, are caused in the smelting process, so that misjudgment of management is caused.
The production amount of nonferrous metal smelting solid wastes in China is huge, and the nonferrous metal smelting solid wastes mainly come from the pyrometallurgy, wet method and regenerative smelting of copper, lead, zinc and aluminum. The dangerous waste is usually high in heavy metal content and various in metal types, and if the dangerous waste is poured randomly or is not normally disposed, secondary pollution is very easy to cause, and ecological environment and human health are threatened.
At present, technologies such as pyrometallurgy, hydrometallurgy and the like are mainly adopted for recycling metals in nonferrous smelting wastes, and in view of the current situation that the existing nonferrous metal hazardous wastes contain a plurality of metal elements, the traditional single pyrometallurgy and hydrometallurgy cannot effectively extract a plurality of valuable metals, and the existing nonferrous metal hazardous wastes are basically sintered or palletized into a furnace, so that the preparation efficiency is low. Therefore, a technology capable of recycling multiple metals simultaneously is urgently needed, recycled materials are reused to the greatest extent, dangerous wastes are effectively treated, and recycling cost is reduced.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for treating zinc-copper-containing hazardous waste by using a suspension magnetization roasting furnace, which comprises the following steps:
(1) Treating raw materials: crushing the zinc-copper-containing hazardous waste into powdery materials through ball milling, and removing moisture in the materials through filter pressing by a filter press;
(2) Preheating and roasting: feeding powdery material into a system pipeline through a feeding system of a suspension roasting furnace, mixing the powdery material with hot flue gas generated by a combustor arranged in a main furnace in the pipeline to perform preliminary preheating and dehydration, reducing the temperature of the flue gas, and feeding the preheated powdery material into the main furnace for further heating;
(3) And (3) reduction roasting: the preheated powdery material from the main furnace enters a reduction chamber, and zinc steam is obtained after reduction roasting treatment;
(4) Smelting by an ore smelting furnace fire method: in the blanking pipe of the suspension roasting furnace at the front end of the submerged arc furnace, flux is fed through a screw feeder, so that the flux is mixed with the material subjected to reduction roasting, the mixed material is put into the submerged arc furnace, and the material is heated to a molten state through electrode heating, so that molten slag and matte are separated, and copper matte is obtained.
(5) And (3) cooling flue gas: mixing zinc steam subjected to reduction roasting treatment with flue gas generated in the smelting process of an ore smelting furnace, and then mixing with cold air for cooling treatment to obtain zinc powder; the materials after the reduction roasting enter an ore-smelting furnace for further pyrometallurgy, and the cooled flue gas is discharged after dust collection, desulfurization and denitrification treatment by a cloth bag.
(6) Slag treatment: and (5) carrying out water quenching on the slag discharged from the submerged arc furnace to obtain water quenched slag.
The suspension roasting furnace is operated by a main induced draft fan so that the whole system operates in a negative pressure state, the whole system controls a smoke gas operation path through negative pressure, and the negative pressure control range is-5 to-10 kpa.
In the step (1), the particle size of the powdery material in the powdery material is-200 meshes, and the particle size accounts for 50+/-5% of the total mass of the material.
In the step (1), after filter pressing, the water content of the powdery material is reduced to below 10%.
In the step (2), the temperature of the material after preliminary preheating is 250-300 ℃.
In the step (2), the temperature of the main furnace is 900-1200 ℃.
In the step (2), the frequency of a main induced draft fan of the suspension roasting furnace is adjusted to control the atmosphere in the suspension roasting furnace to be a peroxy environment, and all the adhering water can be removed in the process;
in the step (3), the reduction roasting temperature is at least 950 ℃, and the reduction roasting time is 0.5-2 h.
In the step (3), the reduction roasting process is neededTo be introduced directly into the reducing gas, the gas can be CO or H 2 One or a mixture of both of them.
In the step (4), the flux is pyrite and silica, the mass of the pyrite is 6-8% of that of the material, and the mass of the silica is 4-6% of that of the material.
In the step (4), the flue gas in the submerged arc furnace is 1200-1350 ℃.
By adopting the technical scheme of the invention, the suspension magnetization roasting-submerged arc furnace is adopted to treat dangerous waste, so that the dangerous waste is reduced in advance, the suspension magnetization roasting furnace has strong adaptability to materials, so that various solid dangerous wastes can be pretreated and roasted by using the suspension magnetization roasting, the submerged arc furnace is also a mature technology for treating powdery materials, simultaneously, metal can be well separated and settled from slag, and the recovery rate of valuable metal is improved.
Compared with the prior art, the method for treating zinc-copper-containing hazardous waste by using the suspension magnetizing roasting furnace has the beneficial effects that:
(1) The suspension magnetization roasting-submerged arc furnace is adopted to treat dangerous waste, so that the dangerous waste is reduced in advance, the use of solid reducing agent is reduced by using gas for reduction in advance, and the suspension magnetization roasting furnace has strong adaptability to materials, so that various solid dangerous wastes can be pretreated and roasted by using suspension magnetization roasting;
(2) No waste is generated after treatment, so that the recycling of dangerous waste is realized, and finally, products such as copper matte, zinc powder, water quenching slag and the like can be obtained;
(3) The treatment cost is low, and the system automation degree is high.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
Example 1
A method for treating zinc-copper-containing hazardous waste by using a suspension magnetization roasting furnace is shown in a flow chart as shown in figure 1, and comprises the following steps:
(1) Treating raw materials: crushing zinc-copper-containing hazardous waste into powdery materials with the mass ratio of 50% by ball milling, removing water in the materials by controlling a pressing mechanism of a filter press in the filter press, and reducing the water content to below 10% after filter pressing by the filter press;
(2) Preheating and roasting: preheating and dehydrating zinc-copper-containing hazardous waste with the water content below 10% under the action of hot flue gas, reducing the temperature of the flue gas, keeping the preheating temperature at 250 ℃, controlling the flue gas running path through negative pressure, controlling the negative pressure to be within-6 kpa, controlling the atmosphere to be a peroxy environment, and removing all the attached water in the process;
(3) And (3) reduction roasting: the temperature range of the reduction roasting is 1000 ℃, and the reduction roasting time is controlled to be 0.5h; zinc steam is obtained after reduction roasting treatment; in the reduction roasting process, a direct introduction of reducing gas is needed, and the gas is CO and H 2 Mixing the gases;
(4) Smelting by an ore smelting furnace fire method: mixing the copper-containing dangerous waste material after reduction treatment with flux ingredients, wherein the flux is pyrite and silica, the mass of the pyrite is 7.5% of that of the material, the mass of the silica is 5% of that of the material, putting the mixed material into a submerged arc furnace at 1200 ℃ to heat the material to a molten state, and then heating the melt by using an electrode to separate slag matte, thereby obtaining qualified matte.
(5) And (3) cooling flue gas: mixing the zinc-containing flue gas after the reduction roasting treatment with the submerged arc furnace flue gas, and then carrying out cooling treatment to obtain a final zinc powder product; the roasted material enters an ore-smelting furnace for further pyrometallurgy, and the cooled flue gas is discharged after dust collection, desulfurization and denitrification treatment by a cloth bag.
(6) Slag treatment: and (5) carrying out water quenching on the slag discharged from the submerged arc furnace to obtain water quenched slag.
93% of the zinc-copper hazardous waste is disposed of in this example, the copper recovery is 82.24% and the zinc recovery is 81.36%.
Example 2
A method for treating zinc-copper-containing hazardous waste by using a suspension magnetization roasting furnace comprises the following steps:
(1) Treating raw materials: crushing zinc-copper-containing hazardous waste into powdery materials with the mass ratio of 50% by ball milling, removing water in the materials by controlling a pressing mechanism of a filter press in the filter press, and reducing the water content to below 10% after filter pressing by the filter press;
(2) Preheating and roasting: preheating and dehydrating zinc-copper-containing hazardous waste with the water content below 10% under the action of hot gas, reducing the temperature of flue gas, keeping the preheating temperature at 250 ℃, controlling the flue gas running path through negative pressure, controlling the negative pressure control range to-7.5 kpa, controlling the atmosphere to be a peroxy environment, and removing all the attached water in the process;
(3) And (3) reduction roasting: the control temperature range of the reduction roasting is 1050 ℃, and the reduction roasting time is controlled to be 1h; zinc steam is obtained after reduction roasting treatment; in the reduction roasting process, a direct introduction of reducing gas is needed, and the gas is CO and H 2 Mixing the gases;
(4) Smelting by an ore smelting furnace fire method: mixing the copper-containing dangerous waste material after reduction treatment with flux ingredients, wherein the flux is pyrite and silica, the mass of the pyrite is 7.5% of that of the material, the mass of the silica is 5% of that of the material, putting the mixed material into a submerged arc furnace at 1200 ℃ to heat the material to a molten state, and then heating the melt by using an electrode to separate slag matte, thereby obtaining qualified matte.
(5) And (3) cooling flue gas: mixing the zinc-containing flue gas after the reduction roasting treatment with the submerged arc furnace flue gas, and then carrying out cooling treatment to obtain a final zinc powder product; the roasted material enters an ore-smelting furnace for further pyrometallurgy, and the cooled flue gas is discharged after dust collection, desulfurization and denitrification treatment by a cloth bag.
(6) Slag treatment: and (5) carrying out water quenching on the slag discharged from the submerged arc furnace to obtain water quenched slag.
In this example 97% of the hazardous zinc and copper waste was disposed of, copper recovery was 84.56% and zinc recovery was 84.98%.
Example 3
A method for treating zinc-copper-containing hazardous waste by using a suspension magnetization roasting furnace comprises the following steps:
(1) Treating raw materials: crushing zinc-copper-containing hazardous waste into powdery materials with the mass ratio of 50% by ball milling, removing water in the materials by controlling a pressing mechanism of a filter press in the filter press, and reducing the water content to below 10% after filter pressing by the filter press;
(2) Preheating and roasting: preheating and dehydrating zinc-copper-containing hazardous waste with the water content below 10% under the action of hot gas, reducing the temperature of flue gas, keeping the preheating temperature at 250 ℃, controlling the flue gas running path through negative pressure, controlling the negative pressure control range to-8.6 kpa, controlling the atmosphere to be a peroxy environment, and removing all the attached water in the process;
(3) And (3) reduction roasting: the control temperature range of the reduction roasting is 1200 ℃, and the reduction roasting time is controlled to be 1.5h; zinc steam is obtained after reduction roasting treatment; in the reduction roasting process, a direct introduction of reducing gas is needed, and the gas is CO and H 2 Mixing the gases;
(4) Smelting by an ore smelting furnace fire method: mixing the copper-containing dangerous waste material after reduction treatment with flux ingredients, wherein the flux is pyrite and silica, the mass of the pyrite is 7.5% of that of the material, the mass of the silica is 5% of that of the material, putting the mixed material into a submerged arc furnace at 1200 ℃ to heat the material to a molten state, and then heating the melt by using an electrode to separate slag matte, thereby obtaining qualified matte.
(5) And (3) cooling flue gas: mixing the zinc-containing flue gas after the reduction roasting treatment with the submerged arc furnace flue gas, and then carrying out cooling treatment to obtain a final zinc powder product; the roasted material enters an ore-smelting furnace for further pyrometallurgy, and the cooled flue gas is discharged after dust collection, desulfurization and denitrification treatment by a cloth bag.
(6) Slag treatment: and (5) carrying out water quenching on the slag discharged from the submerged arc furnace to obtain water quenched slag.
In this example, 95% of the hazardous zinc and copper waste was disposed of, with a copper recovery of 82.15% and a zinc recovery of 83.24%.
Example 4
A method for treating zinc-copper-containing hazardous waste by using a suspension magnetization roasting furnace comprises the following steps:
(1) Treating raw materials: crushing zinc-copper-containing hazardous waste into powdery materials by ball milling, wherein the powdery materials are 200 meshes and have a mass ratio of 50%, removing water in the materials by controlling a pressing mechanism of a filter press in the filter press, and reducing the water content to below 10% after the materials are subjected to filter pressing by the filter press;
(2) Preheating and roasting: preheating and dehydrating zinc-copper-containing hazardous waste with the water content below 10% under the action of hot gas, reducing the temperature of flue gas, keeping the preheating temperature at 250 ℃, controlling the flue gas running path through negative pressure, controlling the negative pressure control range to-7.2 kpa, controlling the atmosphere to be a peroxy environment, and removing all the attached water in the process;
(3) And (3) reduction roasting: the control temperature range of the reduction roasting is 1200 ℃, and the reduction roasting time is controlled to be 2 hours; zinc steam is obtained after reduction roasting treatment; in the reduction roasting process, a direct introduction of reducing gas is needed, and the gas is CO and H 2 Mixing the gases;
(4) Smelting by an ore smelting furnace fire method: mixing the copper-containing dangerous waste material after reduction treatment with flux ingredients, wherein the flux is pyrite and silica, the mass of the pyrite is 7.5% of that of the material, the mass of the silica is 5% of that of the material, putting the mixed material into a submerged arc furnace at 1200 ℃ to heat the material to a molten state, and then heating the melt by using an electrode to separate slag matte, thereby obtaining qualified matte.
(5) And (3) cooling flue gas: mixing the zinc-containing flue gas after the reduction roasting treatment with the submerged arc furnace flue gas, and then carrying out cooling treatment to obtain a final zinc powder product; the roasted material enters an ore-smelting furnace for further pyrometallurgy, and the cooled flue gas is discharged after dust collection, desulfurization and denitrification treatment by a cloth bag.
(6) Slag treatment: and (5) carrying out water quenching on the slag discharged from the submerged arc furnace to obtain water quenched slag.
93.5% of the zinc-copper hazardous waste is disposed of in this example, the copper recovery is 81.25% and the zinc recovery is 82%.
Example 5
A method for treating zinc-copper-containing hazardous waste by using a suspension magnetization roasting furnace comprises the following steps:
(1) Treating raw materials: crushing zinc-copper-containing hazardous waste into powdery materials by ball milling, wherein the powdery materials are 200 meshes and have a mass ratio of 50%, removing water in the materials by controlling a pressing mechanism of a filter press in the filter press, and reducing the water content to below 10% after the materials are subjected to filter pressing by the filter press;
(2) Preheating and roasting: preheating and dehydrating zinc-copper-containing hazardous waste with the water content below 10% under the action of hot gas, reducing the temperature of flue gas, keeping the preheating temperature at 250 ℃, controlling the flue gas running path through negative pressure, controlling the negative pressure control range to-7.5 kpa, controlling the atmosphere to be a peroxy environment, and removing all the attached water in the process;
(3) And (3) reduction roasting: the control temperature range of the reduction roasting is 1050 ℃, and the reduction roasting time is controlled to be 1h; zinc steam is obtained after reduction roasting treatment; in the reduction roasting process, a direct introduction of reducing gas is needed, and the gas is CO and H 2 Mixing the gases;
(4) Smelting by an ore smelting furnace fire method: mixing the copper-containing dangerous waste material after reduction treatment with flux ingredients, wherein the flux is pyrite and silica, the mass of the pyrite is 7% of that of the material, the mass of the silica is 5% of that of the material, putting the mixed material into a submerged arc furnace at 1200 ℃ to heat the material to a molten state, and then heating the melt by using an electrode to separate slag matte, thereby obtaining qualified matte.
(5) And (3) cooling flue gas: mixing the zinc-containing flue gas after the reduction roasting treatment with the submerged arc furnace flue gas, and then carrying out cooling treatment to obtain a final zinc powder product; the roasted material enters an ore-smelting furnace for further pyrometallurgy, and the cooled flue gas is discharged after dust collection, desulfurization and denitrification treatment by a cloth bag.
(6) Slag treatment: and (5) carrying out water quenching on the slag discharged from the submerged arc furnace to obtain water quenched slag.
In this example 96% of the hazardous zinc and copper waste was disposed of with a copper recovery of 83.36% and a zinc recovery of 84%.
Example 6
A method for treating zinc-copper-containing hazardous waste by using a suspension magnetization roasting furnace comprises the following steps:
(1) Treating raw materials: crushing zinc-copper-containing hazardous waste into powdery materials by ball milling, wherein the powdery materials are 200 meshes and have a mass ratio of about 50%, removing water in the materials by controlling a pressing mechanism of a filter press in the filter press, and reducing the water content to below 10% after the materials are filtered by the filter press;
(2) Preheating and roasting: preheating and dehydrating zinc-copper-containing hazardous waste with the water content below 10% under the action of hot gas, reducing the temperature of flue gas, keeping the preheating temperature at 250 ℃, controlling the flue gas running path through negative pressure, controlling the negative pressure control range to-7.5 kpa, controlling the atmosphere to be a peroxy environment, and removing all the attached water in the process;
(3) And (3) reduction roasting: the control temperature range of the reduction roasting is 1050 ℃, and the reduction roasting time is controlled to be 1h; zinc steam is obtained after reduction roasting treatment; in the reduction roasting process, a direct introduction of reducing gas is needed, and the gas is CO and H 2 Mixing the gases;
(4) Smelting by an ore smelting furnace fire method: mixing the copper-containing dangerous waste material after reduction treatment with flux ingredients, wherein the flux is pyrite and silica, the mass of the pyrite is 6% of that of the material, the mass of the silica is 4.5% of that of the material, putting the mixed material into a submerged arc furnace at 1200 ℃ to heat the material to a molten state, and then heating the melt by using an electrode to separate slag matte, thereby obtaining qualified matte.
(5) And (3) cooling flue gas: mixing the zinc-containing flue gas after the reduction roasting treatment with the submerged arc furnace flue gas, and then carrying out cooling treatment to obtain a final zinc powder product; the roasted material enters an ore-smelting furnace for further pyrometallurgy, and the cooled flue gas is discharged after dust collection, desulfurization and denitrification treatment by a cloth bag.
(6) Slag treatment: and (5) carrying out water quenching on the slag discharged from the submerged arc furnace to obtain water quenched slag.
93% of the zinc-copper hazardous waste is treated in the embodiment, the copper recovery rate is 82.01%, and the zinc recovery rate is 81.98%.
Claims (10)
1. A method for treating zinc-copper-containing hazardous waste by using a suspension magnetization roasting furnace, which is characterized by comprising the following steps:
(1) Treating raw materials: crushing the zinc-copper-containing hazardous waste into powdery material by ball milling, and removing the moisture in the powdery material by filter pressing;
(2) Preheating and roasting: feeding powdery material into a system pipeline, mixing the powdery material with hot flue gas in a main furnace of a suspension roasting furnace to perform preliminary preheating and dehydration, reducing the temperature of the flue gas, and feeding the preheated powdery material into the main furnace of the suspension roasting furnace for further heating;
(3) And (3) reduction roasting: the preheated powdery material from the main furnace enters a reduction chamber, and zinc steam is obtained after reduction roasting treatment;
(4) Smelting by an ore smelting furnace fire method: feeding flux into a blanking pipe of a suspension roasting furnace at the front end of an ore furnace through a screw feeder, mixing the flux with the materials subjected to reduction roasting, and putting the mixed materials into the ore furnace, heating to a melting state, so that melt slag and matte are separated, and copper matte is obtained;
(5) And (3) cooling flue gas: mixing zinc steam subjected to reduction roasting treatment with flue gas generated in the smelting process of an ore smelting furnace, and then mixing with cold air for cooling treatment to obtain zinc powder; the materials after the reduction roasting enter an ore-smelting furnace for further pyrometallurgy, and the cooled flue gas is discharged after dust collection, desulfurization and denitrification treatment by a cloth bag;
(6) Slag treatment: and (5) carrying out water quenching on the slag discharged from the submerged arc furnace to obtain water quenched slag.
2. The method for treating zinc-copper-containing hazardous waste by using a suspension magnetization roasting furnace according to claim 1, wherein the suspension roasting furnace is operated by a main induced draft fan to enable the whole system to operate in a negative pressure state, and the whole system controls a flue gas operation path through negative pressure, and the negative pressure is controlled within a range of-5 to-10 kpa.
3. The method for treating hazardous waste containing zinc and copper by using a suspension magnetization roasting furnace according to claim 1, wherein in the step (1), the particle size of the powdery material in the powdery material is-200 meshes, and the particle size is 50+/-5% of the total mass of the powdery material.
4. The method for treating zinc-copper-containing hazardous waste by using a suspension magnetization roasting furnace according to claim 1, wherein in the step (1), the water content of the powdery material is reduced to below 10% after the filter pressing.
5. The method for treating zinc-copper-containing hazardous waste by using a suspension magnetizing roasting furnace according to claim 1, wherein in the step (2), the temperature of the powder-containing material after preliminary preheating is 250-300 ℃, and the temperature of a main furnace of the suspension roasting furnace is 900-1200 ℃.
6. The method for treating zinc-copper-containing hazardous waste by using a suspension magnetizing roasting furnace according to claim 1, wherein in the step (2), the frequency of a main induced draft fan of the suspension roasting furnace is adjusted to control the atmosphere in the suspension roasting furnace to be a peroxy environment, and all the attached water can be removed in the process.
7. The method for treating zinc-copper-containing hazardous waste by using a suspension magnetization roasting furnace according to claim 1, wherein in the step (3), the reduction roasting temperature is at least 950 ℃, and the reduction roasting time is 0.5-2 h.
8. A method for treating hazardous waste containing zinc and copper by using a suspension magnetization roasting furnace according to claim 1, wherein in the step (3), a reducing gas is introduced through the reducing roasting process, and the gas is CO and H 2 One or a mixture of both of them.
9. The method for treating zinc-copper-containing hazardous waste by using a suspension magnetization roasting furnace according to claim 1, wherein in the step (4), the flux is pyrite and silica, the mass of the pyrite is 6-8% of that of the material, and the mass of the silica is 4-6% of that of the material.
10. The method for treating zinc-copper-containing hazardous waste by using a suspension magnetization roasting furnace according to claim 1, wherein in the step (4), the flue gas in the submerged arc furnace is 1200-1350 ℃.
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| CN202310599965.6A CN116837214A (en) | 2023-05-25 | 2023-05-25 | Method for treating zinc-copper-containing hazardous waste by using suspension magnetization roasting furnace |
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