CN111850295A - Method for processing African low-grade copper-cobalt ore - Google Patents
Method for processing African low-grade copper-cobalt ore Download PDFInfo
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- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
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- C22B3/06—Extraction of metal compounds from ores or concentrates by wet processes by leaching in inorganic acid solutions, e.g. with acids generated in situ; in inorganic salt solutions other than ammonium salt solutions
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- C22B15/00—Obtaining copper
- C22B15/0063—Hydrometallurgy
- C22B15/0065—Leaching or slurrying
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Abstract
The invention discloses a method for treating African low-grade copper-cobalt ores, relates to the technology of non-ferrous metal hydrometallurgy, and aims to solve the problems that the production cost is high and part of procedures are not suitable for African national conditions.
Description
Technical Field
The invention relates to a non-ferrous metal hydrometallurgy technology, in particular to a method for processing African low-grade copper-cobalt ore.
Background
In African countries, a large number of investors have been introduced in recent years because of their abundance in natural resources, particularly mineral resources. However, with the entrance of more and more investors, the high-grade copper-cobalt ore is less and less, while the low-grade copper-cobalt ore has higher production and operation cost and higher grade ore, so that a treatment method suitable for the low-grade copper-cobalt ore in african countries is needed.
The treatment of the low-grade copper-cobalt ore in African countries is divided into three essential steps, wherein the first stage is crushing and ore grinding, the second stage is leaching, and the third stage is extraction and electrodeposition; the existing production mode is that a crusher and a ball mill are used for crushing and grinding ores, and a resin electrodeposition tank is used for electrodeposition, so that the production cost is high, and part of procedures are not suitable for African national conditions.
Therefore, a new solution is needed to solve this problem.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for processing African low-grade copper-cobalt ores, which is lower in production cost and meets the environmental requirements of the African copper-cobalt ore processing.
The technical purpose of the invention is realized by the following technical scheme: a method for processing African low-grade copper-cobalt ore comprises the following steps: 1) transporting low-grade raw ores from a raw ore storage yard to a raw ore bin by a loader, arranging a heavy plate feeder at the bottom of the raw ore bin to feed into a jaw crusher for coarse crushing, conveying the coarsely crushed materials to a middle storage yard by a belt conveyor, and naturally stacking the materials into an ore pile by adopting single-point discharging; 2) the materials accumulated in the middle storage yard are unloaded onto another belt conveyor through a plate feeder, the materials are conveyed to a semi-automatic mill by the belt conveyor, ground by the semi-automatic mill, discharged to an ore pulp pump pool, pumped to a hydrocyclone by a slurry pump for classification, settled sand generated by the hydrocyclone is sent to an overflow ball mill for regrinding, the ore discharge of the overflow ball mill and the ore discharge of the semi-automatic mill share one ore pulp pump pool, stubborn stones generated by the hydrocyclone are concentrated and then returned to the semi-automatic mill for regrinding, and overflow liquid generated by the hydrocyclone is sent to a pre-leaching deep dewatering cone concentrator through a slurry pump; 3) the overflow liquid of the pre-leaching dewatering cone thickener is directly recycled as return water, the bottom flow of the pre-leaching dewatering cone thickener automatically flows into a stirrer, is mixed with raffinate of an extraction workshop for pulping and then is pumped to a stirring leaching tank of an acid leaching workshop; 4) continuously stirring the stirring leaching tank, pumping the mixed ore pulp into the acid leaching stirring leaching tank when the concentration of the mixed ore pulp in the stirring leaching tank reaches 33%, and then carrying out forward-flow continuous leaching by the multistage stirring leaching tank, wherein concentrated sulfuric acid is added into the acid leaching stirring leaching tank and the multistage stirring leaching tank in the process; 5) pumping the leached ore pulp into a washing thickener by a pump to carry out four-stage CCD countercurrent washing, simultaneously, respectively adding flocculating agents into a plurality of washing thickeners to ensure the sedimentation effect, automatically flowing overflow liquid of the washing thickeners into a leaching stock solution pool, pumping the washed overflow liquid into a tailing pond by a underflow pump, piling tailings in the tailing pond, and pumping clear liquid in the tailing pond back to a first-stage washing thickener; the extraction stock solution of the extraction stock solution pool is treated by 2-section extraction and 1-section back extraction, after 2-section extraction, the raffinate automatically flows into a raffinate clarification tank, the clarified raffinate enters a dehydration stirring tank before extraction for pulping of dehydration concentration underflow before extraction, a loaded organic phase enters an organic phase circulation tank and is then pumped to a back extraction section, the loaded copper organic phase enters a back extraction section mixing chamber to be mixed with an electric barren solution for back extraction, and copper in the organic phase is back extracted under high acidity so that copper ions are transferred from the organic phase to a water phase; 6) the copper sulfate solution in the water phase automatically flows into an electric liquid accumulation circulating pool after being clarified and deoiled, and is conveyed into a high-efficiency resin electrodeposition tank through a conveying pump to be electrodeposited until the concentration of copper ions reaches 30-35 g/L; 7) continuously electrodepositing the electric barren solution electrodeposited to 30-35g/L in the step 6) to 5-10g/L by using a cyclone electrodeposition tank, and sending the solution after electrodeposition to a back extraction section to form closed cycle; 8) and (3) returning the supernatant in the tailing pond to the washing operation in the step 5), periodically extracting a small part of the magnesium oxide to neutralize and precipitate cobalt to obtain cobalt hydroxide so as to recover a small amount of cobalt metal ions in the solution.
By adopting the technical scheme, the consumption of steel balls is reduced and the stock of ores for 4 months is reduced by adopting a mode of combining a jaw crusher, a semi-autogenous mill and an overflow ball mill in the steps 1) and 2), and the consumption of the steel balls is less because the semi-autogenous mill mainly uses the ores as a medium, so that the method is more suitable for the local operating environment in Africa compared with the mode of jaw crushing and direct ball milling adopted in the prior art; it should be further noted that, in the prior art, there is a certain requirement for the dryness of ores, and non-continent countries divide dry seasons and rainy seasons, so that a large amount of ores need to be stored in dry seasons, and the ores need to be covered in a rainproof manner, the stored ore amount can guarantee production tasks in rainy seasons and a period of time after the rainy seasons, and according to 3 months of stockpiling amount in a stockyard, the stockpiling yard needs to have ore amount storage for at least 7 months before the rainy season comes, i.e. the ore amount needs to be stockpiled for 4 months more, which causes corresponding increase of mining investment, and conversely, the method of combining a jaw crusher, a semi-autogenous mill and an overflow ball mill is adopted in the application, so that the wet ores mined in african rainy seasons can be adapted, thereby reducing the stockpiling amount of 4 months, and greatly reducing the mobile capital and capital occupation cost of 4 months in enterprises;
Step 3) the dewatering deep cone thickener reuses overflow liquid before leaching, so that the utilization rate of water resources is improved, the sewage discharge is reduced, and the operation requirement of an African lean water environment is met; the raffinate in the extraction workshop is used as the mixed pulping acid, so that the utilization efficiency of the raffinate is effectively improved, and the equipment operation cost is reduced;
step 4) fully stirring the overflow liquid through the stirring leaching tank and the multi-stage stirring leaching tank, thereby effectively improving the concentration uniformity of the overflow liquid; concentrated sulfuric acid is added in the stirring process to improve the concentration of acid radicals in the overflowing liquid, so that a large amount of metal substances are ensured to enter an ion free state;
step 3), step 4) and step 5) carry on the concentrated, washing of ore pulp through the way that the deep cone thickener of dehydration before soaking and washing thickener carry on four-stage CCD countercurrent flow washing, have avoided the traditional a large amount of filter press filtration to cause the slag quantity large, manpower high in labor intensity and high disadvantage of the failure rate, have greatly raised the production efficiency, save the human cost;
step 5) adopting 2-stage extraction and 1-stage back extraction to effectively ensure that copper ions enter the aqueous phase solution in the form of a copper sulfate solution on the premise of separating impurities;
step 6) and step 7) adopt the way that the electrodeposition tank of resin combines with eddy current electrodeposition tank, obtain the copper of electrodeposition, the liquid is sent to the back extraction process after the electrodeposition, has reduced the load of the back extraction organic phase, has raised the extraction efficiency, has saved the extractant consumption, has reduced the extractant consumption;
Step 8), supplying the supernatant in the recycled tailing pond to a washing thickener, further improving the extraction rate of copper, improving the utilization rate of water resources and reducing the emission of polluted water; and magnesium oxide is added periodically to recover precipitated cobalt, so that the extraction of metal cobalt is realized.
The invention is further configured to: screening low-grade raw ores in the raw ore storage yard in the step 1) by using an ore screening machine, and then sending the screened low-grade raw ores to a raw ore bin, wherein the screening specification is 1-3% in grade and the granularity is 0-500 mm; the coarse crushing granularity of the jaw crusher is 0-250 mm.
The invention is further configured to: the grinding granularity of the semi-automatic grinding machine in the step 2) is 80 percent with the granularity of 0-3 mm and the concentration of 75 percent, and the grinding granularity of the overflow type ball mill is 70 percent to 75 percent with the granularity of 0-0.074mm
The invention is further configured to: the underflow concentration of the thickener of the step 3) is controlled between 60 and 65 percent, and is preferably 65 percent.
The invention is further configured to: the leaching temperature of the acid leaching agitation leaching tank and the multistage agitation leaching tank in the step 4) is normal temperature, the leaching time is 4-6h, and the pH value of the leaching end point is 1.5-2.
The invention is further configured to: the washing water for washing the thickener in the step 5) is part of raffinate from a raffinate clarifying tank, and the washing water ratio is 2-3: 1.
The invention is further configured to: the high-efficiency resin electrodeposition tank in the step 6) electrodeposits the copper sulfate solution until the concentration of copper ions is 30-35g/L, preferably 35g/L, and the current density is 200-300A/m2Preferably 300A/m2。
The invention is further configured to: in the step 7), a rotational flow electrodeposition tank is used for electrodepositing the copper sulfate solution from 30-35g/L to 5-10g/L, preferably 10g/L, and the current density is 400-600A/m 2, preferably 500A/m 2.
In conclusion, the invention has the following beneficial effects: 1. the consumption of steel balls is reduced by adopting a mode of combining a jaw crusher, a semi-automatic mill and an overflow ball mill, so that the production cost is reduced;
2. the mode of combining the jaw crusher, the semi-autogenous mill and the overflow ball mill is adopted, and the device can adapt to wet ores mined in African rainy seasons, so that the ore stock in 4 months is reduced, and the mobile capital and capital occupation cost of enterprises in 4 months are greatly reduced;
3. the pre-leaching dewatering cone thickener recycles overflow liquid, improves the utilization rate of water resources, reduces sewage discharge and is beneficial to the operation requirement of an African lean water environment;
4. the raffinate in the extraction workshop is used as the mixed pulping acid, so that the utilization efficiency of the raffinate is effectively improved, and the equipment operation cost is reduced;
5. The ore pulp is concentrated and washed in a mode of carrying out four-stage CCD countercurrent washing by a pre-leaching deep cone thickener and a washing thickener, so that the defects of large slag amount, high labor intensity, high failure rate and the like caused by the filtration of a large number of traditional filter presses are overcome, the production efficiency is greatly improved, and the labor cost is saved;
6. 2-stage extraction and 1-stage back extraction are adopted, so that the copper ions are effectively ensured to enter the aqueous phase solution in the form of a copper sulfate solution on the premise of separating impurities;
7. the method is characterized in that the resin electrodeposition tank and the rotational flow electrodeposition tank are combined to obtain electrodeposited copper, and the liquid after electrodeposition is sent to a back extraction process, so that the load of a back extraction organic phase is reduced, the extraction efficiency is improved, the usage amount of an extractant is saved, and the consumption of the extractant is reduced;
8. the supernatant in the recycled tailing pond is supplied to a washing thickener, so that the extraction rate of copper is further improved, the utilization rate of water resources is improved, and the emission of polluted water is reduced; magnesium oxide is added periodically to recover precipitated cobalt, so that the extraction of metal cobalt is realized;
9. after being screened, the ore is sent into a jaw crusher to avoid the damage of ore with overlarge grain diameter or the interference of the jaw crusher;
10. part of the raffinate of the recycling raffinate clarification tank is supplied to the washing thickener, so that the utilization rate of water resources is improved on one hand, and the utilization rate of sulfate ions is improved on the other hand.
Drawings
FIG. 1 is a schematic diagram of a process system according to the present invention;
FIG. 2 is a diagram of a specific implementation process system of the invention, and the diagram shows that the ore treatment amount is 3750t/d, the water content of the rainy season ore is 10%, and the water content of the dry season ore is 3%.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
A method for processing African low-grade copper-cobalt ore, as shown in figure 1 and figure 2, comprises the following steps:
1) screening low-grade raw ores from a raw ore storage yard by using a screening machine, and then transferring the low-grade raw ores to a raw ore bin by using a loader, wherein the screening specification is 1-3% in grade and 0-500mm in granularity; a heavy plate feeder is arranged at the bottom of a raw ore bin and fed into a jaw crusher for coarse crushing, the coarse crushing granularity is 0-250 mm, the coarsely crushed materials are conveyed to a middle storage yard by a belt conveyor, and a single-point discharging mode is adopted for natural stacking to form an ore pile.
2) Unloading the materials accumulated in the middle storage yard onto another belt conveyor through a plate feeder, conveying the materials to a semi-autogenous mill through the belt conveyor, grinding the materials through the semi-autogenous mill until the granularity is 0-3mm and accounts for 80 percent and the concentration is 75 percent, discharging the materials to a pulp pump pool, and pumping the materials to a hydrocyclone through a slurry pump for classification; sending settled sand generated by the hydrocyclone into an overflow ball mill for regrinding, wherein the grinding granularity is 0-0.074mm and accounts for 70% -75%, the ore discharge of the overflow ball mill and the ore discharge of a semi-autogenous mill share one ore pulp pump pool, returning stubborn stones generated by the hydrocyclone to the semi-autogenous mill for regrinding after being concentrated, and sending overflow liquid generated by the hydrocyclone into a pre-leaching deep cone thickener through a slurry pump.
3) The overflow liquid of the pre-leaching deep cone thickener is directly recycled as return water, the underflow concentration of the pre-leaching deep cone thickener is controlled to be 60-65%, preferably 65%, the overflow liquid automatically flows into a stirrer, and is mixed with raffinate in an extraction workshop for pulping and then pumped to a stirring leaching tank in an acid leaching workshop.
4) And continuously stirring the stirring leaching tank, pumping the mixed ore pulp into the acid leaching stirring leaching tank when the concentration of the mixed ore pulp in the stirring leaching tank reaches 33%, and continuously leaching the mixed ore pulp by using the multistage stirring leaching tank in a forward flow manner at normal temperature for 4-6h, wherein concentrated sulfuric acid is added into the acid leaching stirring leaching tank and the multistage stirring leaching tank in the process, and the pH value of the leaching end point is 1.5-2.
5) Pumping the leached ore pulp into a washing thickener by using a pump, introducing washing water, carrying out four-stage CCD (charge coupled device) countercurrent washing according to the washing water ratio of 2-3:1, simultaneously adding flocculating agents into a plurality of washing thickeners to ensure the sedimentation effect, automatically flowing overflow liquid of the washing thickeners into a leaching stock solution pool, pumping the overflow liquid into a tailing pond after washing, piling tailings in the tailing pond, and pumping clear liquid in the tailing pond back to a first-stage washing thickener;
the extraction stock solution of the extraction stock solution pool is treated by 2-section extraction and 1-section back extraction, after 2-section extraction, the raffinate automatically flows into a raffinate clarification tank, part of the clarified raffinate enters a dehydration stirring tank before extraction for pulping of dehydration concentration underflow before extraction, the other part of the clarified raffinate enters a washing concentrator as washing water, a loaded organic phase enters an organic phase circulation tank and then is pumped to a back extraction section, the loaded copper organic phase enters a back extraction section mixing chamber to be mixed with an electric barren solution for back extraction, and copper in the organic phase is back extracted under high acidity, so that copper ions are transferred from the organic phase to a water phase.
6) The copper sulfate solution in the water phase flows into an electric liquid circulating pool after being clarified and deoiled, and is conveyed into a high-efficiency resin electrodeposition tank through a conveying pump, electrodeposition is carried out until the concentration of copper ions reaches 30-35g/L, preferably 35g/L, and the current density is 300A/m-2Preferably 300A/m2。
7) Continuously electrodepositing the electric barren solution electrodeposited to 30-35g/L in the step 6) to 5-10g/L, preferably 10g/L by using a rotational flow electrodeposition tank, wherein the current density is 400-2Preferably 500A/m2And the liquid after electrodeposition is sent to a back extraction section to form closed circulation.
8) And (3) returning the supernatant in the tailing pond to the washing operation in the step 5), periodically extracting a small part of the magnesium oxide to neutralize and precipitate cobalt to obtain cobalt hydroxide so as to recover a small amount of cobalt metal ions in the solution.
The application has the following beneficial effects: step 1) and step 2) adopt the mode of jaw breaker, semi-autogenous mill and overflow ball mill combination, have reduced the consumption of steel ball, and reduced the ore reserve of 4 months, it should be said that, because the semi-autogenous mill mainly uses the ore as the medium, so the consumption of steel ball is less, compared with adopting jaw breaking and ball mill mode directly in the prior art, more suitable for the local operational environment of Africa; it should be noted that, in the prior art, there is a certain requirement for the dryness of ores, and non-continent countries are divided into dry seasons and rainy seasons, so that a large amount of ores need to be stored in dry seasons, and the ores need to be covered in a rainproof manner, the stored ore amount can guarantee the production task in the rainy seasons and a period of time after the rainy seasons, and according to 3 months of stockpiling amount in a stockyard, the stockyard needs to have at least 7 months of ore amount storage before the rainy season comes, i.e. the stockpiling amount needs to be increased by 4 months, which causes the corresponding increase of mining investment.
Step 3) the dewatering deep cone thickener reuses overflow liquid before leaching, so that the utilization rate of water resources is improved, the sewage discharge is reduced, and the operation requirement of an African lean water environment is met; the raffinate in the extraction workshop is used as the mixed pulping acid, so that the utilization efficiency of the raffinate is effectively improved, and the equipment operation cost is reduced.
Step 4) fully stirring the overflow liquid through the stirring leaching tank and the multi-stage stirring leaching tank, thereby effectively improving the concentration uniformity of the overflow liquid; and concentrated sulfuric acid is added in the stirring process to improve the concentration of acid radicals in the overflow liquid, so that a large amount of metal substances are ensured to enter an ion free state.
And 3), 4) and 5) concentrating and washing the ore pulp in a four-stage CCD (charge coupled device) countercurrent washing mode by a pre-leaching dewatering cone thickener and a washing thickener, so that the defects of large slag amount, high labor intensity, high failure rate and the like caused by the filtration of a large number of traditional filter presses are overcome, the production efficiency is greatly improved, and the labor cost is saved.
And step 5) adopting 2-stage extraction and 1-stage back extraction, and effectively ensuring that copper ions enter the aqueous phase solution in the form of a copper sulfate solution on the premise of separating impurities.
And 6) and 7) adopting a mode of combining a resin electrodeposition tank and a rotational flow electrodeposition tank to obtain electrodeposited copper, and conveying the liquid after electrodeposition to a back extraction process, so that the load of a back extraction organic phase is reduced, the extraction efficiency is improved, the use amount of an extractant is saved, and the consumption of the extractant is reduced.
Step 8), supplying the supernatant in the recycled tailing pond to a washing thickener, further improving the extraction rate of copper, improving the utilization rate of water resources and reducing the emission of polluted water; and magnesium oxide is added periodically to recover precipitated cobalt, so that the extraction of metal cobalt is realized.
The specific embodiments are only for explaining the present invention, and the present invention is not limited thereto, and those skilled in the art can make modifications without inventive contribution to the present embodiments as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (8)
1. A method for processing African low-grade copper-cobalt ore is characterized by comprising the following steps: the method comprises the following steps:
1) transporting low-grade raw ores from a raw ore storage yard to a raw ore bin by a loader, arranging a heavy plate feeder at the bottom of the raw ore bin to feed into a jaw crusher for coarse crushing, conveying the coarsely crushed materials to a middle storage yard by a belt conveyor, and naturally stacking the materials into an ore pile by adopting single-point discharging;
2) the materials accumulated in the middle storage yard are unloaded onto another belt conveyor through a plate feeder, the materials are conveyed to a semi-automatic mill by the belt conveyor, ground by the semi-automatic mill, discharged to an ore pulp pump pool, pumped to a hydrocyclone by a slurry pump for classification, settled sand generated by the hydrocyclone is sent to an overflow ball mill for regrinding, the ore discharge of the overflow ball mill and the ore discharge of the semi-automatic mill share one ore pulp pump pool, stubborn stones generated by the hydrocyclone are concentrated and then returned to the semi-automatic mill for regrinding, and overflow liquid generated by the hydrocyclone is sent to a pre-leaching deep dewatering cone concentrator through a slurry pump;
3) The overflow liquid of the pre-leaching dewatering cone thickener is directly recycled as return water, the bottom flow of the pre-leaching dewatering cone thickener automatically flows into a stirrer, is mixed with raffinate of an extraction workshop for pulping and then is pumped to a stirring leaching tank of an acid leaching workshop;
4) continuously stirring the stirring leaching tank, pumping the mixed ore pulp into the acid leaching stirring leaching tank when the concentration of the mixed ore pulp in the stirring leaching tank reaches 33%, and then carrying out forward-flow continuous leaching by the multistage stirring leaching tank, wherein concentrated sulfuric acid is added into the acid leaching stirring leaching tank and the multistage stirring leaching tank in the process;
5) pumping the leached ore pulp into a washing thickener by a pump to carry out four-stage CCD countercurrent washing, simultaneously, respectively adding flocculating agents into a plurality of washing thickeners to ensure the sedimentation effect, automatically flowing overflow liquid of the washing thickeners into a leaching stock solution pool, pumping the washed overflow liquid into a tailing pond by a underflow pump, piling tailings in the tailing pond, and pumping clear liquid in the tailing pond back to a first-stage washing thickener;
the extraction stock solution of the extraction stock solution pool is treated by 2-section extraction and 1-section back extraction, after 2-section extraction, the raffinate automatically flows into a raffinate clarification tank, the clarified raffinate enters a dehydration stirring tank before extraction for pulping of dehydration concentration underflow before extraction, a loaded organic phase enters an organic phase circulation tank and is then pumped to a back extraction section, the loaded copper organic phase enters a back extraction section mixing chamber to be mixed with an electric barren solution for back extraction, and copper in the organic phase is back extracted under high acidity so that copper ions are transferred from the organic phase to a water phase;
6) The copper sulfate solution in the water phase automatically flows into an electric liquid accumulation circulating pool after being clarified and deoiled, and is conveyed into a high-efficiency resin electrodeposition tank through a conveying pump to be electrodeposited until the concentration of copper ions reaches 30-35 g/L;
7) continuously electrodepositing the electric barren solution electrodeposited to 30-35g/L in the step 6) to 5-10g/L by using a cyclone electrodeposition tank, and sending the solution after electrodeposition to a back extraction section to form closed cycle;
8) and (3) returning the supernatant in the tailing pond to the washing operation in the step 5), periodically extracting a small part of the magnesium oxide to neutralize and precipitate cobalt to obtain cobalt hydroxide so as to recover a small amount of cobalt metal ions in the solution.
2. The method for processing the African low-grade copper-cobalt ore according to claim 1, characterized in that: screening low-grade raw ores in the raw ore storage yard in the step 1) by using an ore screening machine, and then sending the screened low-grade raw ores to a raw ore bin, wherein the screening specification is 1-3% in grade and the granularity is 0-500 mm; the coarse crushing granularity of the jaw crusher is 0-250 mm.
3. The method for processing the African low-grade copper-cobalt ore according to claim 1, characterized in that: the grinding granularity of the semi-automatic grinding machine in the step 2) is 0-3 mm and accounts for 80%, the concentration is 75%, and the grinding granularity of the overflow ball mill is 0-0.074mm and accounts for 70-75%.
4. The method for processing the African low-grade copper-cobalt ore according to claim 1, characterized in that: the underflow concentration of the thickener of the step 3) is controlled between 60 and 65 percent, and is preferably 65 percent.
5. The method for processing the African low-grade copper-cobalt ore according to claim 1, characterized in that: the leaching temperature of the acid leaching agitation leaching tank and the multistage agitation leaching tank in the step 4) is normal temperature, the leaching time is 4-6h, and the pH value of the leaching end point is 1.5-2.
6. The method for processing the African low-grade copper-cobalt ore according to claim 1, characterized in that: the washing water for washing the thickener in the step 5) is part of raffinate from a raffinate clarifying tank, and the washing water ratio is 2-3: 1.
7. The method for processing the African low-grade copper-cobalt ore according to claim 1, characterized in that: the high-efficiency resin electrodeposition tank in the step 6) electrodeposits the copper sulfate solution until the concentration of copper ions is 30-35g/L, preferably 35g/L, and the current density is 200-300A/m2Preferably 300A/m2。
8. The method for processing the African low-grade copper-cobalt ore according to claim 1, characterized in that: in the step 7), a rotational flow electrodeposition tank is used for electrodepositing the copper sulfate solution from 30-35g/L to 5-10g/L, preferably 10g/L, and the current density is 400-600A/m 2, preferably 500A/m 2.
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| CN113388741A (en) * | 2021-06-11 | 2021-09-14 | 紫金矿业集团股份有限公司 | Method for comprehensively recovering copper and cobalt from copper oxide cobalt ore |
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