CN102719671A - Method and device for deeply removing copper of nickel thiocarbonate from nickel-containing solution - Google Patents
Method and device for deeply removing copper of nickel thiocarbonate from nickel-containing solution Download PDFInfo
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- CN102719671A CN102719671A CN2012102341622A CN201210234162A CN102719671A CN 102719671 A CN102719671 A CN 102719671A CN 2012102341622 A CN2012102341622 A CN 2012102341622A CN 201210234162 A CN201210234162 A CN 201210234162A CN 102719671 A CN102719671 A CN 102719671A
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Abstract
The invention discloses a method and device for deeply removing copper of nickel thiocarbonate from a nickel-containing solution. Substantially, the nickel thiocarbonate after pulping is used as a copper removal agent; and the copper removal agent is automatically added through a mechanical mixing pump and is uniformly mixed with the nickel-containing solution in a pipeline reactor to remove copper. The method can realize continuous copper removal in the closed environment, the copper removal efficiency is high, and the concentration of the liquid cooper after copper removal is lower than 3mg/l. The copper-nickel ratio in the copper removal slag is greater than 15, thereby completely meeting the production requirements.
Description
Technical field
The present invention relates to copper nickel hydrometallurgy field, particularly the technological method and the device of degree of depth separating copper nickel from copper nickel mixing solutions.
Background technology
Copper nickel is as the similar element of chemical property, and high efficiency separation becomes the difficult problem on the domestic and international metallurgical boundary of long-term puzzlement.In China's electricity nickel standard (GB/T6516-1997Ni9996) foreign matter content is required very strictness, particularly the content requirement to impurity copper is lower than 0.01%.This just requires before electro deposited nickel, the impurity copper in the nickle electrolysis anode solution to be carried out the degree of depth and removes.To this difficult problem, China classifies this research as key research projects twice in " eight or five " and the ninth five-year plan, and has once attempted the whole bag of tricks, is not well solved always.So in the time of 2004, Jinchuan company orients towards the whole country and carries out the copper removal project bid, and the copper content in the solution behind the copper removal is loosened to 3mg/L by 2mg/L, except that copper nickel mass ratio in the copper ashes then is reduced to 15 by 20.
Thiocarbonic acid SOH nickel is a kind of special efficient Tong Shiji that removes that designs to degree of depth copper removal from nickle electrolysis anode solution.When thiocarbonic acid SOH nickel joins in the nickle electrolysis anode solution behind the uniform mixing, can the copper in the solution be reduced to below the 3mg/L, meanwhile can make except that copper nickel ratio in the copper ashes to be higher than 15, reach the requirement of the qualified electric nickel of industrial production fully.Therefore, thiocarbonic acid SOH nickel can be used as a kind of Tong Shiji that removes efficiently fully and is used for industrial production.
All the time, Jinchuan company adopts nickel ore concentrate to add the anode sludge and removes copper technology, adds fresh in the anolyte in boiling copper removal groove after deironing and has certain active nickel sulfide concentrate (Ni
3S
2) with the anode sludge (mainly containing S), make trace copper in the anolyte be precipitated as CuS and remove by filter.When utilizing this method copper removal and since nickel sulfide concentrate and the anode sludge to mix decoppering agent density bigger, and needs can satisfy the requirement of large-scale continuous copper removal.The principal feature of this method is: decoppering agent adds from the top of copper removal groove; Because density is bigger, in decoppering agent decline process, constantly mix contacting, when treating that it drops to certain position with solution; Since the reaction continue carry out; Remove copper ashes density and diminish, just can discharge from the riser at copper removal groove top, thereby accomplish whole copper removal process with solution.This method is to add the anode sludge to nickel ore concentrate specially to remove process for copper, is guaranteeing under the production-scale situation decoppering agent to be mixed preferably with solution.But because itself there is defective in this technology, cause behind its copper removal the copper ashes amount of output big, nickeliferous height in the copper ashes, nickel-copper ratio reaches 2:1, can't directly return the copper production system, therefore must not no longer adopt " copper ashes chlorine soaks-the electrolysis decopper(ing) entirely " method, and copper nickel is separated.It is tediously long that this removes process for copper, and cost is high, and complicated operation is prone to cause environmental problem, but also cause precious metal to disperse.
Thiocarbonic acid SOH nickel copper removal can become alternative existing nickel ore concentrate and add the anode sludge except that process for copper.Because the physicochemical property of thiocarbonic acid SOH nickel are different from nickel ore concentrate and add the anode sludge.Thiocarbonic acid SOH nickel has high reactive behavior and lower density owing to be newborn synthetic.If also adopt the similar operation mode, guaranteeing industrial scale, promptly do not reduce treatment capacity, when the slave unit top adds thiocarbonic acid SOH nickel copper removal,, reach every 75m because solution flow is very big
3/ h, decoppering agent will certainly be taken out of by solution fast, causes the reaction times too short, and copper removal does not reach requirement.Therefore be necessary to develop a kind of can the adaptation to the copper-removing method of thiocarbonic acid SOH nickel characteristic and supporting device.
Summary of the invention
To above-mentioned situation; The method and the device that the purpose of this invention is to provide a kind of thiocarbonic acid SOH nickel degree of depth copper removal from solution containing nickel; Utilize in the pipeline reactor material can the thorough mixing reaction and do not have back-mixing; And thiocarbonic acid SOH nickel is easy to by pulp and the fireballing characteristics of copper-stripping reaction, proposes in pipeline reactor, to adopt the method for thiocarbonic acid SOH nickel degree of depth copper removal from solution containing nickel, and its concrete operations step is following:
The method of a kind of thiocarbonic acid SOH nickel degree of depth copper removal from solution containing nickel: solution containing nickel is adjusted the pH value, and the heating back is mixed with thiocarbonic acid SOH nickel slurry and is injected in the pipeline reactor, reacts copper removal;
The diameter d of described pipeline reactor (cm), length L (m), the flow V (m of mixing solutions
3/ h) relation with residence time t (min) is Vt=60 π (d/200)
2L, and residence time t is 15～60min.
The preceding pH value with solution containing nickel of reaction is adjusted to 2.0～6.5 in the aforesaid method, and is heated to 60 ℃ ~ 90 ℃.
Described thiocarbonic acid SOH nickel slurry preparation method is:
(1) the pH value with solution containing nickel transfers to 3.0 ~ 7.0, is 0.3～1.0 to add thio-carbonate solution by the mol ratio of nickel in thio-carbonate and the solution containing nickel then, and stirring reaction 5～30 minutes, obtains thiocarbonic acid SOH nickel slurry;
(2) or with obtaining thiocarbonic acid SOH nickel slurry in the step (1) carry out filtering separation earlier and obtain solid sulfur for nickelous carbonate, then with solid sulfur for nickelous carbonate and solution containing nickel or water mixing pulp, obtain thiocarbonic acid SOH nickel slurry;
Described thio-carbonate solution is Na
2CS
3, Na
2CS
4, Na
2CS
5, Na
2C
2S
5, K
2CS
3, K
2CS
4, K
2CS
5, K
2C
2S
5In one or more mixture.
When reacting in the aforesaid method: is 1.1～1.5 to mix solution containing nickel and thiocarbonic acid SOH nickel slurry by the mol ratio of the copper in thio-carbonate and the solution containing nickel, is re-introduced in the pipeline reactor, reacts.
Described solution containing nickel is a nickle electrolysis anode solution, NiSO
4, NiCl
2, Ni (NO
3)
2The mixture of one or more in the solution.
The device that above-mentioned method is supporting; Comprise thiocarbonic acid SOH nickel slurry tank, thiocarbonic acid SOH nickel slurry feed pump, solution containing nickel feed pipe, solution containing nickel fresh feed pump and pipeline reactor; Described thiocarbonic acid SOH nickel slurry tank through thiocarbonic acid SOH nickel slurry feed pump be connected to the solution containing nickel feed pipe with mix sulphur for nickelous carbonate slurry and solution containing nickel, mixed thiocarbonic acid SOH nickel slurry and solution containing nickel export pipeline reactor to through the solution containing nickel fresh feed pump.
Be provided with pipeline mixing device in the described pipeline reactor, described pipeline mixing device is a cellular grid, in order to strengthen thiocarbonic acid SOH nickel slurry and solution containing nickel hybrid reaction.
Technical superiority of the present invention
(1) because entire reaction course is in pipeline, to carry out; Have under the certain flow rate condition at fluid; And the flow mixing device of pipeline interval existence, can guarantee the reaction of decoppering agent and solution thorough mixing, therefore can eliminate fully because of the low detrimentally affect that causes of thiocarbonic acid SOH nickel density;
(2) since in present method the decoppering agent that uses be easy to pulp as thiocarbonic acid SOH nickel, can add getting final product as required with pump through dominant discharge, together be injected in the pipeline with nickle electrolysis anode solution then and get final product through the mechanically mixing pump.This operating method can make the copper removal operating process become very simple, can realize fully that decoppering agent adds the robotization of process, reduces labour intensity greatly.
(3) whole process is in closed reactor, to react, and can reduce calorific loss greatly.
Description of drawings
Fig. 1 is the structural representation of the corollary apparatus of the inventive method;
Wherein, 1 is thiocarbonic acid SOH nickel slurry tank, and 2 is thiocarbonic acid SOH nickel slurry feed pump, and 3 is the solution containing nickel feed pipe, and 4 is the solution containing nickel fresh feed pump, and 5 is pipeline reactor, and 6 is pipeline mixing device.
Embodiment
Be intended to further specify the present invention below in conjunction with embodiment, and unrestricted the present invention.
Referring to Fig. 1; The corollary apparatus of the inventive method comprises thiocarbonic acid SOH nickel slurry tank 1, thiocarbonic acid SOH nickel slurry feed pump 2, solution containing nickel feed pipe 3, solution containing nickel fresh feed pump 4 and pipeline reactor 5; Thiocarbonic acid SOH nickel slurry tank 1 through thiocarbonic acid SOH nickel slurry feed pump 2 be connected to solution containing nickel feed pipe 3 with mix sulphur for nickelous carbonate slurry and solution containing nickel, mixed thiocarbonic acid SOH nickel slurry and solution containing nickel export pipeline reactor 5 to through solution containing nickel fresh feed pump 4.Be provided with pipeline mixing device 6 in the pipeline reactor 5, pipeline mixing device 6 is a cellular grid, in order to strengthen thiocarbonic acid SOH nickel slurry and solution containing nickel hybrid reaction.
Embodiment 1
Being that the pH value of the nickle electrolysis anode solution of 70g/l transfers to 4.0 with nickel concentration earlier, is 0.3 ratio and Na then in the mol ratio of nickel in thio-carbonate and the electrolytic solution
2CS
3Solution hybrid reaction 10 minutes, the thiocarbonic acid SOH nickel slurry that obtains thio-carbonate concentration and be 0.5mol/l is as decoppering agent; Be that the nickle electrolysis anode solution pH of 0.5g/l transfers to 4.5 with copper concentration then, temperature is heated to 60 ℃; Be 1.3 mixed then by the mol ratio of the copper in thio-carbonate in the decoppering agent and the nickle electrolysis anode solution, the input speed of control thiocarbonic acid SOH nickel slurry feed pump is 1.56m
3/ h is injected in the solution containing nickel feed pipe, mixes the back with nickle electrolysis anode solution with 76.56m
3The input speed of/h [is the flow V (m of mixing solutions
3/ h)] and being injected into diameter 40cm through the solution containing nickel fresh feed pump, length is in the pipeline reactor of 305m, feed liquid residence time in pipeline reactor is 30 minutes.Reaction is accomplished in the electrolytic solution of back copper concentration and is reduced to 0.002g/L, except that copper nickel ratio in the copper ashes is 25.
Embodiment 2
Being that the pH value of the nickel sulfate solution of 70g/l transfers to 5.0 with nickel concentration earlier, is 0.4 ratio and Na then in the mol ratio of nickel in thio-carbonate and the electrolytic solution
2CS
3Solution hybrid reaction 20 minutes, the thiocarbonic acid SOH nickel slurry that obtains thio-carbonate concentration and be 1.2mol/l is as decoppering agent; Be that the nickle electrolysis anode solution pH of 0.6g/l transfers to 5.0 with copper concentration then, temperature is heated to 65 ℃; Be 1.4 mixed then by the mol ratio of the copper in thio-carbonate in the decoppering agent and the nickle electrolysis anode solution, the input speed of control thiocarbonic acid SOH nickel slurry feed pump is 0.82m
3/ h is injected in the solution containing nickel feed pipe, mixes the back with nickle electrolysis anode solution with 75.82m
3The input speed of/h [is the flow V (m of mixing solutions
3/ h)] and being injected into diameter 30cm through the solution containing nickel fresh feed pump, length is in the pipeline reactor of 268m, feed liquid residence time in pipeline reactor is 15 minutes.Reaction is accomplished in the electrolytic solution of back copper concentration and is reduced to 0.0018g/L, except that copper nickel ratio in the copper ashes is 22.
Embodiment 3
Being that the pH value of the nickle electrolysis anode solution of 70g/l transfers to 5.0 with nickel concentration earlier, is 0.4 ratio and Na then in the mol ratio of nickel in thio-carbonate and the electrolytic solution
2C
2S
5Solution hybrid reaction 15 minutes, the thiocarbonic acid SOH nickel slurry that obtains thio-carbonate concentration and be 0.8mol/l is as decoppering agent; Be that the nickle electrolysis anode solution pH of 0.5g/l transfers to 4.8 with copper concentration then, temperature is heated to 60 ℃; Be 1.2 mixed then by the mol ratio of the copper in thio-carbonate in the decoppering agent and the nickle electrolysis anode solution, the input speed of control thiocarbonic acid SOH nickel slurry feed pump is 0.82m
3/ h is injected in the solution containing nickel feed pipe, mixes the back with nickle electrolysis anode solution with 75.82m
3The input speed of/h [is the flow V (m of mixing solutions
3/ h)] and being injected into diameter 35cm through the solution containing nickel fresh feed pump, length is in the pipeline reactor of 329m, feed liquid residence time in pipeline reactor is 25 minutes.Reaction is accomplished in the electrolytic solution of back copper concentration and is reduced to 0.0022g/L, except that copper nickel ratio in the copper ashes is 27.
Embodiment 4
Being that the pH value of the nickle electrolysis anode solution of 70g/l transfers to 5.2 with nickel concentration earlier, is 0.6 ratio and Na then in the mol ratio of nickel in thio-carbonate and the electrolytic solution
2CS
5Solution hybrid reaction 12 minutes refilters and obtains thiocarbonic acid SOH nickel solid, then solid and nickel sulfate solution is mixed with that to obtain thio-carbonate concentration be that the thiocarbonic acid SOH nickel slurry of 1.5mol/l is as decoppering agent; Be that the nickle electrolysis anode solution pH of 0.45g/l transfers to 4.2 with copper concentration then, temperature is heated to 63 ℃; Be 1.5 mixed then by the mol ratio of the copper in thio-carbonate in the decoppering agent and the nickle electrolysis anode solution, the input speed of control thiocarbonic acid SOH nickel slurry feed pump is 0.18m
3/ h is injected in the solution containing nickel feed pipe, mixes the back with nickle electrolysis anode solution with 75.18m
3The input speed of/h [is the flow V (m of mixing solutions
3/ h)] and being injected into diameter 50cm through the solution containing nickel fresh feed pump, length is in the pipeline reactor of 383m, feed liquid residence time in pipeline reactor is 60 minutes.Reaction is accomplished in the electrolytic solution of back copper concentration and is reduced to 0.0016g/L, except that copper nickel ratio in the copper ashes is 17.
Being that the pH value of the nickel chloride solution of 70g/l transfers to 4.5 with nickel concentration earlier, is 0.8 ratio and K then in the mol ratio of nickel in thio-carbonate and the electrolytic solution
2CS
3Solution hybrid reaction 15 minutes refilters and obtains thiocarbonic acid SOH nickel solid, and then solid and aqueous solution being prepared thio-carbonate concentration is that the thiocarbonic acid SOH nickel slurry of 1.8mol/l is as decoppering agent; Be that the nickle electrolysis anode solution pH of 0.7g/l transfers to 4.0 with copper concentration then, temperature is heated to 66 ℃; Be 1.2 mixed then by the mol ratio of the copper in thio-carbonate in the decoppering agent and the nickle electrolysis anode solution, the input speed of control thiocarbonic acid SOH nickel slurry feed pump is 0.55m
3/ h is injected in the solution containing nickel feed pipe, mixes the back with nickle electrolysis anode solution with 75.55m
3The input speed of/h [is the flow V (m of mixing solutions
3/ h)] and being injected into diameter 45cm through the solution containing nickel fresh feed pump, length is in the pipeline reactor of 158m, feed liquid residence time in pipeline reactor is 20 minutes.Reaction is accomplished in the electrolytic solution of back copper concentration and is reduced to 0.0022g/L, except that copper nickel ratio in the copper ashes is 30.
Being that the pH value of the nickel nitrate solution of 70g/l transfers to 5.0 with nickel concentration earlier, is 1.0 ratio and K then in the mol ratio of nickel in thio-carbonate and the electrolytic solution
2C
2S
5Solution hybrid reaction 15 minutes, the thiocarbonic acid SOH nickel slurry for preparing concentration and be thio-carbonate and be 1.0mol/l is as decoppering agent; Be that the nickle electrolysis anode solution pH of 0.55g/l transfers to 4.2 with copper concentration then, temperature is heated to 70 ℃; Be 1.22 mixed then by the mol ratio of the copper in thio-carbonate in the decoppering agent and the nickle electrolysis anode solution, the input speed of control thiocarbonic acid SOH nickel slurry feed pump is 0.79m
3/ h is injected in the solution containing nickel feed pipe, mixes the back with nickle electrolysis anode solution with 75.79m
3The input speed of/h [is the flow V (m of mixing solutions
3/ h)] and being injected into diameter 35cm through the solution containing nickel fresh feed pump, length is in the pipeline reactor of 197m, feed liquid residence time in pipeline reactor is 15 minutes.Reaction is accomplished in the electrolytic solution of back copper concentration and is reduced to 0.0025g/L, except that copper nickel ratio in the copper ashes is 26.
Embodiment 7
Being that the pH value of the nickle electrolysis anode solution of 70g/l transfers to 4.9 with nickel concentration earlier, is 0.7 ratio and Na then in the mol ratio of nickel in thio-carbonate and the electrolytic solution
2CS
4Solution hybrid reaction 30 minutes, the thiocarbonic acid SOH nickel slurry for preparing concentration and be thio-carbonate and be 1.3mol/l is as decoppering agent; Be that the nickle electrolysis anode solution pH of 0.52g/l transfers to 4.0 with copper concentration then, temperature is heated to 90 ℃; Be 1.3 mixed then by the mol ratio of the copper in thio-carbonate in the decoppering agent and the nickle electrolysis anode solution, the input speed of control thiocarbonic acid SOH nickel slurry feed pump is 0.61m
3/ h is injected in the solution containing nickel feed pipe, mixes the back with nickle electrolysis anode solution with 75.61m
3The input speed of/h [is the flow V (m of mixing solutions
3/ h)] and being injected into diameter 25cm through the solution containing nickel fresh feed pump, length is in the pipeline reactor of 514m, feed liquid residence time in pipeline reactor is 20 minutes.Reaction is accomplished in the electrolytic solution of back copper concentration and is reduced to 0.0025g/L, except that copper nickel ratio in the copper ashes is 26.
Embodiment 8
Being that the pH value of the nickle electrolysis anode solution of 70g/l transfers to 5.0 with nickel concentration earlier, is 0.5 ratio and Na then in the mol ratio of nickel in thio-carbonate and the electrolytic solution
2CS
3Solution hybrid reaction 20 minutes refilters and obtains thiocarbonic acid SOH nickel solid, then solid and nickel sulfate solution is mixed with that to obtain thio-carbonate concentration be that the thiocarbonic acid SOH nickel slurry of 1.6mol/l is as decoppering agent; Be that the nickle electrolysis anode solution pH of 0.65g/l transfers to 4.5 with copper concentration then, temperature is heated to 65 ℃; Be 1.4 mixed then by the mol ratio of the copper in thio-carbonate in the decoppering agent and the nickle electrolysis anode solution, the input speed of control thiocarbonic acid SOH nickel slurry feed pump is 0.67m
3/ h is injected in the solution containing nickel feed pipe, mixes the back with nickle electrolysis anode solution with 75.67m
3The input speed of/h [is the flow V (m of mixing solutions
3/ h)] and being injected into diameter 32cm through the solution containing nickel fresh feed pump, length is in the pipeline reactor of 235m, feed liquid residence time in pipeline reactor is 15 minutes.Reaction is accomplished in the electrolytic solution of back copper concentration and is reduced to 0.0021g/L, except that copper nickel ratio in the copper ashes is 28.
Claims (8)
1. the method for thiocarbonic acid SOH nickel degree of depth copper removal from solution containing nickel is characterized in that: solution containing nickel is adjusted the pH value, and the heating back is mixed with thiocarbonic acid SOH nickel slurry and is injected in the pipeline reactor, reacts copper removal.
2. according to the method for a kind of thiocarbonic acid SOH nickel degree of depth copper removal from solution containing nickel described in the claim 1, it is characterized in that: the diameter d of described pipeline reactor pipeline (cm), length L (m), the flow V (m of mixing solutions
3/ h) relation with residence time t (min) is Vt=60 π (d/200)
2L, and residence time t is 15～60min.
3. according to the method for a kind of thiocarbonic acid SOH nickel degree of depth copper removal from solution containing nickel described in the claim 1, it is characterized in that: the pH value of solution containing nickel is adjusted to 2.0～6.5, and is heated to 60 ℃ ~ 90 ℃.
4. according to the method for a kind of thiocarbonic acid SOH nickel degree of depth copper removal from solution containing nickel described in the claim 1, it is characterized in that: described thiocarbonic acid SOH nickel slurry preparation method is:
(1) the pH value with solution containing nickel transfers to 3.0 ~ 7.0, is 0.3～1.0 to add thio-carbonate solution by the mol ratio of nickel in thio-carbonate and the solution containing nickel then, and stirring reaction 5～30 minutes, obtains thiocarbonic acid SOH nickel slurry;
(2) or with obtaining thiocarbonic acid SOH nickel slurry in the step (1) carry out filtering separation earlier and obtain solid sulfur for nickelous carbonate, then with solid sulfur for nickelous carbonate and solution containing nickel or water mixing pulp, obtain thiocarbonic acid SOH nickel slurry;
Described thio-carbonate solution is Na
2CS
3, Na
2CS
4, Na
2CS
5, Na
2C
2S
5, K
2CS
3, K
2CS
4, K
2CS
5, K
2C
2S
5In one or more mixture.
5. according to the method for a kind of thiocarbonic acid SOH nickel degree of depth copper removal from solution containing nickel described in the claim 1; It is characterized in that: is 1.1～1.5 to mix solution containing nickel and thiocarbonic acid SOH nickel slurry by the mol ratio of the copper in thio-carbonate and the solution containing nickel; Be re-introduced in the pipeline reactor, react.
6. according to the method for a kind of thiocarbonic acid SOH nickel degree of depth copper removal from solution containing nickel described in claim 1 or 4, it is characterized in that: described solution containing nickel is a nickle electrolysis anode solution, NiSO
4, NiCl
2, Ni (NO
3)
2The mixture of one or more in the solution.
7. the supporting device of method of each described thiocarbonic acid SOH nickel of claim 1-5 degree of depth copper removal from solution containing nickel; It is characterized in that; Comprise thiocarbonic acid SOH nickel slurry tank, thiocarbonic acid SOH nickel slurry feed pump, solution containing nickel feed pipe, solution containing nickel fresh feed pump and pipeline reactor; Described thiocarbonic acid SOH nickel slurry tank through thiocarbonic acid SOH nickel slurry feed pump be connected to the solution containing nickel feed pipe with mix sulphur for nickelous carbonate slurry and solution containing nickel, mixed thiocarbonic acid SOH nickel slurry and solution containing nickel export pipeline reactor to through the solution containing nickel fresh feed pump.
8. device according to claim 7 is characterized in that, is provided with pipeline mixing device in the described pipeline reactor, and described pipeline mixing device is a cellular grid, in order to strengthen thiocarbonic acid SOH nickel slurry and solution containing nickel hybrid reaction.
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| CN105821206A (en) * | 2016-05-10 | 2016-08-03 | 中国恩菲工程技术有限公司 | Solution purifying system and method |
| CN105838883A (en) * | 2016-05-10 | 2016-08-10 | 中国恩菲工程技术有限公司 | System and method for treating lead-bearing solution |
| CN105950887A (en) * | 2016-05-10 | 2016-09-21 | 中国恩菲工程技术有限公司 | System and method for treating cadmium-bearing solution |
| CN105950867A (en) * | 2016-05-10 | 2016-09-21 | 中国恩菲工程技术有限公司 | System and method for treating copper-bearing solution |
| WO2017193724A1 (en) * | 2016-05-10 | 2017-11-16 | 中国恩菲工程技术有限公司 | System and method for treating copper-containing solution |
| WO2017193726A1 (en) * | 2016-05-10 | 2017-11-16 | 中国恩菲工程技术有限公司 | Solution purification system and method |
| WO2017193725A1 (en) * | 2016-05-10 | 2017-11-16 | 中国恩菲工程技术有限公司 | System and method for treating cadmium-containing solution |
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