CN112695203A - Efficient and environment-friendly recovery method of copper slag - Google Patents
Efficient and environment-friendly recovery method of copper slag Download PDFInfo
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- CN112695203A CN112695203A CN202011438722.7A CN202011438722A CN112695203A CN 112695203 A CN112695203 A CN 112695203A CN 202011438722 A CN202011438722 A CN 202011438722A CN 112695203 A CN112695203 A CN 112695203A
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- copper slag
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- 239000010949 copper Substances 0.000 title claims abstract description 89
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 86
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 86
- 239000002893 slag Substances 0.000 title claims abstract description 84
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000011084 recovery Methods 0.000 title claims abstract description 24
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 54
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 35
- 239000000843 powder Substances 0.000 claims abstract description 34
- 239000007789 gas Substances 0.000 claims abstract description 32
- 229910052742 iron Inorganic materials 0.000 claims abstract description 16
- 238000006243 chemical reaction Methods 0.000 claims abstract description 15
- 238000007885 magnetic separation Methods 0.000 claims abstract description 15
- 239000002440 industrial waste Substances 0.000 claims abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 12
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052911 sodium silicate Inorganic materials 0.000 claims abstract description 12
- 239000004115 Sodium Silicate Substances 0.000 claims abstract description 11
- 238000000498 ball milling Methods 0.000 claims abstract description 11
- 238000002156 mixing Methods 0.000 claims abstract description 9
- 238000006722 reduction reaction Methods 0.000 claims abstract description 8
- 238000000227 grinding Methods 0.000 claims abstract description 7
- 238000000926 separation method Methods 0.000 claims abstract description 7
- 238000001035 drying Methods 0.000 claims abstract description 6
- 238000001914 filtration Methods 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 239000004571 lime Substances 0.000 claims description 7
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 6
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 6
- 239000011261 inert gas Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 5
- 238000004064 recycling Methods 0.000 claims description 4
- 230000007613 environmental effect Effects 0.000 claims 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 8
- 229910052840 fayalite Inorganic materials 0.000 abstract description 8
- 229910052710 silicon Inorganic materials 0.000 abstract description 8
- 239000010703 silicon Substances 0.000 abstract description 8
- 230000006378 damage Effects 0.000 abstract description 3
- 230000003311 flocculating effect Effects 0.000 abstract description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 17
- 229910052751 metal Inorganic materials 0.000 description 12
- 239000002184 metal Substances 0.000 description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 9
- 150000002739 metals Chemical class 0.000 description 9
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 8
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 5
- 239000000377 silicon dioxide Substances 0.000 description 5
- 229910052725 zinc Inorganic materials 0.000 description 5
- 239000011701 zinc Substances 0.000 description 5
- 238000003723 Smelting Methods 0.000 description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 description 4
- 229910017052 cobalt Chemical group 0.000 description 4
- 239000010941 cobalt Chemical group 0.000 description 4
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical group [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 229910002091 carbon monoxide Inorganic materials 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- -1 fetters Substances 0.000 description 3
- 235000012239 silicon dioxide Nutrition 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 229910052681 coesite Inorganic materials 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000002386 leaching Methods 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229910052682 stishovite Inorganic materials 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 229910052905 tridymite Inorganic materials 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 229910020453 SiO2+2NaOH Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- NKWPZUCBCARRDP-UHFFFAOYSA-L calcium bicarbonate Chemical compound [Ca+2].OC([O-])=O.OC([O-])=O NKWPZUCBCARRDP-UHFFFAOYSA-L 0.000 description 1
- 229910000020 calcium bicarbonate Inorganic materials 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical class [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a high-efficiency environment-friendly recovery method of copper slag, which comprises the following steps: 1) drying the copper slag, grinding the copper slag into powder, and filtering the powder through a sieve to obtain copper slag powder; 2) adding a sodium hydroxide solution into the copper slag powder, uniformly mixing, reacting in a hot ball mill at 153-210 ℃, pouring out and standing after preset time, and performing solid-liquid separation to obtain sodium silicate and filter residue; 3) and (3) putting the filter residue obtained in the step (2) into a roasting machine, heating to a roasting temperature, adding industrial waste gas CO gas into the roasting machine, carrying out reduction reaction, pouring out after a preset time, and carrying out magnetic separation to obtain iron and slag. According to the invention, sodium hydroxide solution is added into the copper slag to match with the hot ball milling, so that the destruction of the fayalite structure is accelerated, sodium silicate can be generated by reaction with sodium hydroxide, silicon element is recovered, and the generation of flocculating gel silicon can be avoided.
Description
Technical Field
The invention relates to a copper slag recovery process, in particular to a high-efficiency environment-friendly copper slag recovery method.
Background
The copper slag is slag generated in the copper smelting process, mainly generated in the copper concentrate manufacturing and milling smelting process, and typical components of the copper slag comprise 30-40% of Fe, 0.2-5% of Cu, 35-40% of SiO2, A12 (the contents of h and Ca0 are below 10%, and a small amount of metal elements such as zinc, fetters, diamonds and the like, so that the content of iron in the copper slag is very high.
However, at present, the utilization rate of copper in copper slag in China is less than 12%, the utilization rate of iron is more than 1%, most of copper slag is piled up in a slag yard, land is occupied, the environment is polluted, huge waste of resources is caused, and the copper slag is an important factor for hindering the continuous development of copper smelting enterprises. If can all recycle the iron in the copper slag, not only solved the environmental pollution problem that the copper slag is piled up, can also provide a new raw and other materials for the ironmaking trade simultaneously, reduce the ironmaking cost, make copper smelting enterprise realize the requirement of sustainable development and recycling economy, but most direct adoption concentrated sulfuric acid of current copper slag recovery method leaches many times, produce flocculation gel silicon, and valuable metal recovery effect is unsatisfactory, and most only recovery valuable metal of current copper slag recovery method, and ignore silicon element.
Disclosure of Invention
The invention provides a high-efficiency environment-friendly recovery method of copper slag to overcome the defects in the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme: a high-efficiency environment-friendly recovery method of copper slag comprises the following steps:
1) drying the copper slag, grinding the copper slag into powder, and filtering the powder through a sieve to obtain copper slag powder;
2) adding a sodium hydroxide solution into the copper slag powder, uniformly mixing, reacting in a hot ball mill at 153-210 ℃, pouring out and standing after preset time, and performing solid-liquid separation to obtain sodium silicate and filter residue;
3) putting the filter residue obtained in the step 2 into a roasting machine, heating to a roasting temperature, adding industrial waste gas CO gas into the roasting machine, performing reduction reaction, pouring out the filter residue after a preset time, performing magnetic separation to obtain iron and slag, wherein the key point of recovering iron and copper from copper slag is to destroy the fayalite structure in the copper slag to separate iron and silicon oxides, before destroying the fayalite structure, grinding the copper slag, increasing the contact area of the fayalite structure with a sodium hydroxide solution to accelerate the reaction, and the main component of the fayalite is FeO & SiO2The method comprises the following steps of (1) utilizing the characteristic that silicon dioxide reacts with sodium hydroxide and ferrous oxide does not react with the sodium hydroxide, reacting the silicon dioxide to generate sodium silicate, namely formula (1), wherein the sodium silicate is also called water glass, has wide industrial application, recovers silicon elements while destroying the structure so as to destroy the fayalite structure, reacts in a hot ball mill, accelerates the destruction of the fayalite structure and avoids the generation of flocculent gel silicon, and after the sodium silicate is separated from filter residues, industrial waste gas CO is utilized to reduce iron and other valuable metals, namely formula (2), wherein M is copper, zinc, iron and cobalt;
the equation is as follows:
SiO2+2NaOH＝Na2SiO3+H2O (1)；
MO+CO→M+CO2 (2)；
CO2+Ca(OH)2＝CaCO3↓+H2O (3)。
preferably, the method also comprises a step 4 of introducing the gas generated in the step 3 into lime, wherein the gas inlet flow rate is 2-4mL/min, and the generated CO is2The lime is used for recycling, see formula (3).
Preferably, in the step 1, under the condition of microwave irradiation, hot ball milling reaction is carried out, the microwave frequency is 2500-4000 GHz, and ferrosilicic acid in the copper slag is greatly destroyed by utilizing microwave reinforcement and strengthened alkali dissolution reaction.
Preferably, in the step 1, inert gas capable of discharging air is added into the furnace while the hot ball milling reaction is performed, the stability of the ferrous oxide is poor, the ferrous oxide is easy to perform oxidation reaction with air, and the inert gas is added to reduce the air content and ensure the stability of the ferrous oxide.
Preferably, the particle size of the copper slag powder in the step 1 is 150-350 meshes.
Preferably, the solid-liquid mass volume ratio of the copper slag powder to the sodium hydroxide solution is 1 g: 4-7 ml.
Preferably, the ball milling time is 0.5-2.5 h.
Preferably, the roasting temperature is 400-780 ℃, the gas inflow rate of the industrial waste gas CO gas is 6-8mL/min, and the reduction time is 1-3 h.
Preferably, the magnetic separation intensity is 4000-.
Compared with the prior art, the invention has the beneficial effects that: 1. adding a sodium hydroxide solution into the copper slag to match with the hot ball milling, accelerating the damage of the fayalite structure, reacting with sodium hydroxide to generate sodium silicate, recovering silicon elements and avoiding the generation of flocculating gel silicon;
2. reducing valuable metals by using industrial waste gas carbon monoxide, and recovering the valuable metals while avoiding the carbon monoxide emission to pollute the environment;
3. lime is used to prevent newly generated carbon dioxide gas from polluting the environment.
Detailed Description
The present invention will be described in detail with reference to examples.
Example 1
The invention provides a high-efficiency environment-friendly recovery method of copper slag, which comprises the following steps:
1) drying the copper slag, grinding the copper slag into powder, and filtering the powder through a sieve to obtain copper slag powder, wherein the particle size of the copper slag powder is 150 meshes;
2) adding a sodium hydroxide solution into the copper slag powder, wherein the solid-liquid mass volume ratio of the copper slag powder to the sodium hydroxide solution is 1 g: 4ml of sodium silicate and filter residue are obtained after uniform mixing, reaction is carried out in a hot ball mill after mixing, the temperature is 153 ℃, pouring and standing are carried out after the preset time of 0.5h, and solid-liquid separation is carried out;
3) and (3) putting the filter residue obtained in the step (2) into a roasting machine, heating to 400 ℃, adding industrial waste gas CO gas into the roasting machine while raising the temperature to the roasting temperature, carrying out reduction reaction, pouring out after the preset time of 1h, and separating by magnetic separation to obtain iron and slag, wherein the magnetic separation strength is 4000GBS, and the magnetic separation time is 40 min.
Example 2
A high-efficiency environment-friendly recovery method of copper slag comprises the following steps:
1) drying the copper slag, grinding the copper slag into powder, and filtering the powder through a sieve to obtain copper slag powder, wherein the particle size of the copper slag powder is 200 meshes;
2) adding a sodium hydroxide solution into the copper slag powder, wherein the solid-liquid mass volume ratio of the copper slag powder to the sodium hydroxide solution is 1 g: 5.5ml of sodium silicate and filter residue are obtained after uniform mixing, reaction in a hot ball mill is carried out after mixing, the temperature is 180 ℃, pouring and standing are carried out after the preset time of 2 hours, and solid-liquid separation;
3) and (2) putting the filter residue in the step (2) into a roasting machine, heating to 538 ℃, adding industrial waste gas CO gas into the roasting machine while raising the temperature to the roasting temperature, wherein the air inlet flow rate of the industrial waste gas CO gas (the component is carbon monoxide) is 7mL/min, carrying out reduction reaction, pouring out after the preset time is 2h, and separating by magnetic separation to obtain iron and slag, wherein the magnetic separation strength is 6000GBS, and the magnetic separation time is 78 min.
Example 3
A high-efficiency environment-friendly recovery method of copper slag comprises the following steps:
1) drying the copper slag, grinding the copper slag into powder, and filtering the powder through a sieve to obtain copper slag powder, wherein the particle size of the copper slag powder is 350 meshes;
2) adding a sodium hydroxide solution into the copper slag powder, wherein the solid-liquid mass volume ratio of the copper slag powder to the sodium hydroxide solution is 1 g: 7ml of sodium silicate and filter residue are obtained after uniform mixing, reaction is carried out in a hot ball mill after mixing, the temperature is 210 ℃, pouring and standing are carried out after the preset time of 2.5 hours, and solid-liquid separation;
3) and (3) putting the filter residue obtained in the step (2) into a roasting machine, heating to 780 ℃, adding industrial waste gas CO gas into the roasting machine while raising the temperature to the roasting temperature, wherein the air inlet flow rate of the industrial waste gas CO gas is 8mL/min, carrying out reduction reaction, pouring out after the preset time of 3h, and carrying out magnetic separation to obtain iron and molten slag, wherein the magnetic separation strength is 8000GBS, and the magnetic separation time is 95 min.
Comparative example 1
A method for recovering copper slag comprises the following steps: adding the copper slag into a concentrated sulfuric acid solution, standing for 3 hours, repeatedly leaching for 3 times, and carrying out solid-liquid separation to obtain filtrate and filter residue of valuable metals.
The recovery methods of the same batch and same weight of copper slag are respectively used for recovering valuable metals by using the recovery methods of example 1, example 2, example 3 and comparative example 1, the element content components of the copper slag are shown in table 1, and the content components after recovery are shown in table 2:
TABLE 1
| Copper (%) | Iron (%) | Zinc (%) | Cobalt (%) |
| 3.21 | 46.32 | 4，12 | 0.23 |
TABLE 2
| Content (%) | Example 1 | Example 2 | Example 3 | Comparative example 1 |
| Copper (Cu) | 2.58 | 3.05 | 2.89 | 1.51 |
| Iron | 43.87 | 44.62 | 44.21 | 41.56 |
| Zinc | 3.26 | 3.89 | 3.64 | 2.06 |
| Cobalt | 0.11 | 0.19 | 0.14 | 0.07 |
As can be seen from table 2, example 2 is the most preferred embodiment, the valuable metals leached directly with concentrated sulfuric acid have lower contents than the present invention, and the flocculating gel silica is produced by leaching directly with concentrated sulfuric acid.
Example 4
This embodiment is substantially the same as embodiment 2 except that:
step 4, introducing the gas generated in the step 3 into lime, wherein the gas inlet flow rate is 3mL/min, and generating industrial waste gas CO2The lime is utilized for recycling, and the industrial waste gas CO is avoided2Environmental pollution, and CO recovery by lime2，Calcium bicarbonate is produced.
Example 5
This embodiment is substantially the same as embodiment 2 except that:
in the step 1, under the condition of microwave irradiation, hot ball milling reaction is carried out, the microwave frequency is 3000GHz, and iron silicate in copper slag is greatly destroyed and the reaction is accelerated by utilizing microwave strengthening and alkali-melting strengthening dissolution reaction.
Example 6
This embodiment is substantially the same as embodiment 5 except that:
inert gas capable of discharging air is added into the furnace while the hot ball milling reaction is carried out, the stability of the ferrous oxide is poor, the ferrous oxide is easy to carry out oxidation reaction with the air, the inert gas is added, the air content is reduced, and the stability of the ferrous oxide is ensured.
The recovery method of valuable metals in the same batch and weight of copper slag is respectively used for recovering valuable metals in the recovery methods of example 2, example 5 and example 6, the element content components of the copper slag are shown in table 1, and the content components after recovery are shown in table 3;
TABLE 3
| Content% | Example 2 | Example 5 | Example 6 |
| Copper (Cu) | 3.05 | 3.07 | 3.11 |
| Iron | 44.62 | 45.12 | 45.87 |
| Zinc | 3.89 | 3.95 | 4.01 |
| Cobalt | 0.19 | 0.19 | 0.20 |
As can be seen from table 3, the highest content of valuable metals was recovered by adding an inert gas while performing the thermal ball milling reaction under the microwave irradiation condition.
The above additional technical features can be freely combined and used in superposition by those skilled in the art without conflict.
The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the patent and protection scope of the present invention should be subject to the appended claims.
Claims (9)
1. The efficient and environment-friendly recovery method of copper slag is characterized by comprising the following steps:
1) drying the copper slag, grinding the copper slag into powder, and filtering the powder through a sieve to obtain copper slag powder;
2) adding a sodium hydroxide solution into the copper slag powder, uniformly mixing, reacting in a hot ball mill at 153-210 ℃, pouring out and standing after preset time, and performing solid-liquid separation to obtain sodium silicate and filter residue;
3) and (3) putting the filter residue obtained in the step (2) into a roasting machine, heating to a roasting temperature, adding industrial waste gas CO gas into the roasting machine, carrying out reduction reaction, pouring out after a preset time, and carrying out magnetic separation to obtain iron and slag.
2. The method for efficiently and environmentally recovering the copper slag according to claim 1, further comprising a step 4 of introducing the gas generated in the step 3 into lime under normal pressure, wherein the gas inlet flow rate is 2-4 mL/min.
3. The method for efficiently and environmentally recycling the copper slag according to claim 1, wherein in the step 1, the hot ball milling reaction is performed under the microwave irradiation condition, and the microwave frequency is 2500-4000 GHz.
4. The method for recovering the copper slag with high efficiency and environmental friendliness according to claim 3, wherein in the step 1, inert gas capable of exhausting air is added into the furnace while the hot ball milling reaction is performed.
5. The method for recovering the copper slag in an efficient and environment-friendly manner as claimed in claim 1, wherein the particle size of the copper slag powder in the step 1 is 150-350 meshes.
6. The efficient and environment-friendly recovery method of copper slag as claimed in claim 5, wherein the solid-liquid mass volume ratio of the copper slag powder to the sodium hydroxide solution is 1 g: 4-7 ml.
7. The efficient and environment-friendly recovery method of copper slag as claimed in claim 1, wherein the ball milling time is 0.5-2.5 h.
8. The method for recovering the copper slag in the environment-friendly and efficient manner as claimed in any one of claims 1 to 7, wherein the roasting temperature is 400-780 ℃, the inlet flow rate of the industrial waste gas CO gas is 6-8mL/min, and the reduction time is 1-3 h.
9. The method for recovering the copper slag with high efficiency and environmental protection as claimed in claim 1, wherein the magnetic separation strength is 4000-8000GBS, and the magnetic separation time is 40-95 min.
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- 2020-12-07 CN CN202011438722.7A patent/CN112695203A/en active Pending
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