CN113278817A - Impurity removal method for cobalt ore and crude cobalt salt sulfuric acid leaching solution and application thereof - Google Patents
Impurity removal method for cobalt ore and crude cobalt salt sulfuric acid leaching solution and application thereof Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22B23/00—Obtaining nickel or cobalt
- C22B23/04—Obtaining nickel or cobalt by wet processes
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Abstract
The invention provides an impurity removal method for cobalt ore and crude cobalt salt sulfuric acid leaching solution and application thereof, and relates to the technical field of mineral smelting. Firstly, adding an oxidant into a cobalt ore and a crude cobalt salt sulfuric acid leaching solution, and oxidizing ferrous ions in the leaching solution into trivalent ions to obtain a solution A; then, the pH value of the solution A is adjusted to 3.5-4.0 by using ammonium bicarbonate, so that Fe in the solution A3+Hydrolysis to produce positively charged Fe (OH)3A colloid; meanwhile, the silicon element in the solution A is agglomerated under the acidic condition to form a negatively charged colloid, and then Fe (OH)3The colloid and the silica gel colloid are coagulated to achieve the purpose of removing silicon; in addition, the reaction temperature is 75-85 ℃, and the redundant ferric ions are converted into alum to obtain the ammoniojarosite which is separated from the leaching solution. The impurity removal method can effectively improve the filtering fluidity of the cobalt ore and the crude cobalt salt sulfuric acid leaching solution, and creates good extraction conditions for the subsequent cobalt extraction process.
Description
Technical Field
The invention relates to the technical field of mineral smelting, in particular to an impurity removal method for cobalt ore and crude cobalt salt sulfuric acid leaching solution and application thereof.
Background
The metallic cobalt is widely applied, but the cobalt resource is poor, and only accompanied with other metal ores, and the individual cobalt ore deposit is almost not available. At present, cobalt is extracted by adopting a wet method, after ores and crude cobalt salt are leached by sulfuric acid, leachate not only contains cobalt sulfate, but also contains a large amount of silicon in the form of silicate (silica gel) and divalent ferrous sulfate, the silicate (silica gel) in the leachate can cause great difficulty for the subsequent cobalt extraction process, and the problem is mainly shown that the silica sol blocks filter cloth pores during solution filtration to reduce the filtration efficiency, so that the subsequent production is seriously influenced. The prior desiliconization method for cobalt ore and crude cobalt salt sulfuric acid leaching solution mainly comprises a coagulation desiliconization method, a reverse osmosis method, a centrifugal exchange method, an electrocoagulation method, an extraction method and the like. However, these methods not only use large amount of chemicals, but also have unsatisfactory silicon removal effect, and the silicon removal rate is only 60-70%.
Therefore, it is necessary and urgent to improve the existing silica removal method for cobalt ore and crude cobalt salt sulfuric acid leachate, and to develop a treatment method capable of effectively removing silicon and iron elements in cobalt ore and crude cobalt salt sulfuric acid leachate, and improving the filtration performance of leachate.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The first purpose of the invention is to provide an impurity removal method for cobalt ores and crude cobalt salt sulfuric acid leachate, wherein the impurity removal method has good silicon removal and iron removal efficiency, can effectively improve the filtration fluidity of the cobalt ores and the crude cobalt salt sulfuric acid leachate, and creates good extraction conditions for the subsequent cobalt extraction process.
The second objective of the present invention is to provide an application of the impurity removal method for cobalt ore and crude cobalt salt sulfuric acid leaching solution, which can be widely applied in the process of metal cobalt extraction.
In order to achieve the above purpose of the present invention, the following technical solutions are adopted:
the invention provides an impurity removal method for cobalt ore and crude cobalt salt sulfuric acid leaching solution, which comprises the following steps:
(a) providing cobalt ore and a crude cobalt salt sulfuric acid leaching solution, and then adding an oxidant into the leaching solution for oxidation reaction to obtain a solution A;
(b) and adjusting the pH value of the solution A to 3.5-4.0 by using ammonium bicarbonate, carrying out neutralization reaction at the temperature of 75-85 ℃, and then carrying out solid-liquid separation to obtain the cobalt ore after impurity removal and a crude cobalt salt sulfuric acid leaching solution.
Further, the cobalt ore and crude cobalt salt sulfuric acid leaching solution is a leaching solution with silicon element content of 1.3-1.8 g/L;
preferably, the pH value of the cobalt ore and the sulfuric acid leaching solution of the crude cobalt salt is 1.5-2.5.
Further, the oxidant in the step (a) comprises at least one of hydrogen peroxide, sodium chlorate, potassium chlorate or air-introduced oxidation; sodium chlorate is preferred.
Furthermore, the addition amount of the oxidant is Fe in the leaching solution2+40-60 wt% of the mass.
Further, the temperature of the oxidation reaction in the step (a) is 60-65 ℃, and the time of the oxidation reaction is 1.5-2.5 h.
Further, the time of the neutralization reaction in the step (b) is 3-5 h.
Further, the oxidation reaction in the step (a) is carried out under the condition of stirring, and the stirring speed is preferably 300-350 r/min;
preferably, the neutralization reaction in the step (b) is carried out under the condition of stirring, and the stirring speed is preferably 300-350 r/min.
Further, the separation method of solid-liquid separation comprises at least one of air flotation, filtration and pressure filtration, and preferably filtration.
Further, the method comprises the following steps:
(a) providing cobalt ore and a crude cobalt salt sulfuric acid leaching solution, and then adding an oxidant into the leaching solution at the temperature of 60-65 ℃ for oxidation reaction for 1.5-2.5 hours to obtain a solution A;
the addition amount of the oxidant and Fe in the leaching solution2+The mass ratio of (A) to (B) is 0.4-0.6: 1;
(b) adjusting the pH value of the solution A to 3.5-4.0 by using ammonium bicarbonate, carrying out neutralization reaction for 3-5 h at the temperature of 75-85 ℃, and then filtering to obtain the cobalt ore after impurity removal and a crude cobalt salt sulfuric acid leaching solution.
The invention provides an application of the impurity removal method of the cobalt ore and the crude cobalt salt sulfuric acid leaching solution in the metal cobalt extraction process.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a method for removing impurities from cobalt ore and crude cobalt salt sulfuric acid leaching solution, which comprises the steps of firstly adding an oxidant into the cobalt ore and crude cobalt salt sulfuric acid leaching solution, and oxidizing ferrous ions in the leaching solution into trivalent ions to obtain solution A; then, the pH value of the solution A is adjusted to 3.5-4.0 by using ammonium bicarbonate, so that Fe in the solution A3+Hydrolysis to produce positively charged Fe (OH)3Colloid:
fe (OH) on the surface of solid particles of Fe (OH)3The molecules are ionized under an acidic condition to generate FeO ions, and the reaction formula is as follows:
Fe(OH)3+H+→FeO-+H2o; thereby making Fe (OH)3Becoming a colloid with positive electricity.
Meanwhile, the silicon element in the solution A is mainly SiO3 2-In the form of SiO3 2-Under acidic conditions silicic acid is formed, which is insoluble in water and agglomerates to form a gum nucleus. The silicic acid molecules on the surface of the gel nucleus dissociate into ions: h2SiO3→HSiO3 -+H+And ion HSiO3 -H remaining on the surface to form potential-determining ions as counter ions+One part enters the compact layer, and the rest is distributed in the diffusion layer, and the structural formula of the diffusion layer is as follows:
[H2SiO3]m·yHSiO3 -·(Y—Z)H|zH+it is clear that silica gel is a negatively charged colloid.
Further, in the solution A of the present application, positively charged Fe (OH)3The colloid and the silica gel colloid with negative electricity are interacted and coagulated, thereby achieving the purpose of reducing silicon and removing silicon; in addition, the temperature of the neutralization reaction carried out by the impurity removal method is 75-85 ℃, redundant ferric ions reach the condition of forming alum under the conditions of the temperature and the pH value to generate loose and easily-filtered ammonium jarosite, and then iron is separated from the leachate. The impurity removal method for the cobalt ore and the crude cobalt salt sulfuric acid leaching solution has good silicon removal and iron removal efficiency, can effectively improve the filtration flow property of the cobalt ore and the crude cobalt salt sulfuric acid leaching solution, and creates good extraction conditions for the subsequent cobalt extraction process.
The impurity removal method for cobalt ore and crude cobalt salt sulfuric acid leaching solution provided by the invention can be widely applied to the process of extracting metal cobalt.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
According to one aspect of the invention, a method for removing impurities from cobalt ore and a crude cobalt salt sulfuric acid leaching solution comprises the following steps:
(a) providing cobalt ore and a crude cobalt salt sulfuric acid leaching solution, and then adding an oxidant into the leaching solution for oxidation reaction to obtain a solution A;
(b) and adjusting the pH value of the solution A to 3.5-4.0 by using ammonium bicarbonate, carrying out neutralization reaction at the temperature of 75-85 ℃, and then carrying out solid-liquid separation to obtain the cobalt ore after impurity removal and a crude cobalt salt sulfuric acid leaching solution.
The invention provides a method for removing impurities from cobalt ore and crude cobalt salt sulfuric acid leaching solution, which comprises the steps of firstly adding an oxidant into the cobalt ore and the crude cobalt salt sulfuric acid leaching solution,oxidizing ferrous ions in the leaching solution into trivalent ions to obtain a solution A; then, the pH value of the solution A is adjusted to 3.5-4.0 by using ammonium bicarbonate, so that Fe in the solution A3+Hydrolysis to produce positively charged Fe (OH)3Colloid:
fe (OH) on the surface of solid particles of Fe (OH)3The molecules are ionized under an acidic condition to generate FeO ions, and the reaction formula is as follows:
Fe(OH)3+H+→FeO-+H2o; thereby making Fe (OH)3Becoming a colloid with positive electricity.
Meanwhile, the silicon element in the solution A is mainly SiO3 2-In the form of SiO3 2-Under acidic conditions silicic acid is formed, which is insoluble in water and agglomerates to form a gum nucleus. The silicic acid molecules on the surface of the gel nucleus dissociate into ions: h2SiO3→HSiO3 -+H+And ion HSiO3 -H remaining on the surface to form potential-determining ions as counter ions+One part enters the compact layer, and the rest is distributed in the diffusion layer, and the structural formula of the diffusion layer is as follows:
[H2SiO3]m·yHSiO3 -·(Y—Z)H|zH+it is clear that silica gel is a negatively charged colloid.
Further, in the solution A of the present application, positively charged Fe (OH)3The colloid and the silica gel colloid with negative electricity are interacted and coagulated, thereby achieving the purpose of reducing silicon and removing silicon; in addition, the temperature of the neutralization reaction carried out by the impurity removal method is 75-85 ℃, redundant ferric ions reach the condition of forming alum under the conditions of the temperature and the pH value to generate loose and easily-filtered ammonium jarosite, and then iron is separated from the leachate. The impurity removal method for the cobalt ore and the crude cobalt salt sulfuric acid leaching solution has good silicon removal and iron removal efficiency, can effectively improve the filtration flow property of the cobalt ore and the crude cobalt salt sulfuric acid leaching solution, and creates the following cobalt extraction processGood extraction conditions are provided.
It should be noted that other carbonates can also achieve the same purpose as ammonium bicarbonate, such as sodium carbonate and calcium carbonate, and that some alkalis can also achieve the same purpose as ammonium bicarbonate, such as magnesium oxide, calcium oxide, and calcium hydroxide.
In a preferred embodiment of the invention, the cobalt ore and crude cobalt salt sulfuric acid leaching solution is a leaching solution with a silicon element content of 1.3-1.8 g/L;
in the above preferred embodiment, the pH of the cobalt ore and the crude cobalt salt sulfuric acid leach solution is 1.5 to 2.5.
In a preferred embodiment of the present invention, the oxidizing agent in step (a) comprises at least one of hydrogen peroxide, sodium chlorate, potassium chlorate and air oxidation; sodium chlorate is preferred.
In a preferred embodiment, the hydrogen peroxide in the oxidant has high purity and high price, and the oxidant has low purity, contains excessive P ions, is difficult to remove in the subsequent process, and is easy to fail. Potassium chlorate is also the same reason, and can introduce potassium ion, influences product quality. The air is introduced for long time and the efficiency is low. Therefore, sodium chlorate has the advantages of small dosage and relatively low cost compared with other oxidants, and is the optimal choice.
In the above preferred embodiment, the amount of the oxidant added is Fe in the leachate2+40-60 wt% of the mass.
In a preferred embodiment, the amount of Fe in the leachate is controlled by the amount of the oxidizing agent added3+Total amount of Fe (OH) produced3The sol and all of the silica sol are polymerized, thereby removing the silica gel and improving the filtering performance. If Fe (OH) is formed3The amount of sol does not reach and all silica sol polymerizes, which can cause filtration difficulties. Experiments prove that when the addition amount of the oxidant is Fe in the leaching solution2+40-60 wt% (in the oxidation process) of Fe2+The ion content is directly related to the amount of the oxidant, when Fe2+When the content of the oxidant is more than 1g/L, the content is 40wt percent, and when the content is Fe2+Less than 1g/L, increasing the amount of oxidant, up to 60 wt.%) can be added into the leaching solutionThe divalent iron ions are fully oxidized into trivalent ions, so that the silica gel is polymerized and removed.
In a preferred embodiment of the present invention, the temperature of the oxidation reaction in step (a) is 60 to 65 ℃, and the time of the oxidation reaction is 1.5 to 2.5 hours.
In a preferred embodiment, the temperature of 60 to 65 ℃ is an optimal temperature for forming ferric hydroxide, and the oxidation at the optimal temperature for 1.5 to 2.5 hours can fully oxidize ferrous ions in the leachate into trivalent ions.
In a preferred embodiment of the present invention, the time of the neutralization reaction in the step (b) is 3 to 5 hours.
In a preferred embodiment of the present invention, the oxidation reaction in step (a) is performed under stirring conditions, and the stirring speed is preferably 300 to 350 r/min;
in a preferred embodiment of the present invention, the neutralization reaction in step (b) is performed under stirring, and the stirring speed is preferably 300 to 350 r/min.
In a preferred embodiment of the present invention, the separation method of solid-liquid separation comprises at least one of air flotation, filtration and pressure filtration, preferably filtration.
In a preferred embodiment of the invention, the method comprises the steps of:
(a) providing cobalt ore and a crude cobalt salt sulfuric acid leaching solution, and then adding an oxidant into the leaching solution at the temperature of 60-65 ℃ for oxidation reaction for 1.5-2.5 hours to obtain a solution A;
the addition amount of the oxidant and Fe in the leaching solution2+The mass ratio of (A) to (B) is 0.4-0.6: 1;
(b) adjusting the pH value of the solution A to 3.5-4.0 by using ammonium bicarbonate, carrying out neutralization reaction for 3-5 h at the temperature of 75-85 ℃, and then filtering to obtain the cobalt ore after impurity removal and a crude cobalt salt sulfuric acid leaching solution.
According to one aspect of the invention, the method for removing impurities from the cobalt ore and the crude cobalt salt sulfuric acid leaching solution is applied to the extraction process of metal cobalt.
The impurity removal method for cobalt ore and crude cobalt salt sulfuric acid leaching solution provided by the invention can be widely applied to the process of extracting metal cobalt.
The technical scheme of the invention is further illustrated by taking cobalt ore and a crude cobalt salt sulfuric acid leaching solution (the content of silicon element in the leaching solution is 1.51g/L, and the pH value of the leaching solution is 2.0) as an example, and combining the examples and the comparative examples.
Example 1
An impurity removal method for cobalt ore and crude cobalt salt sulfuric acid leaching solution comprises the following steps:
(a) providing 1000ml of cobalt ore and a crude cobalt salt sulfuric acid leaching solution, and then adding sodium chlorate into the leaching solution at the temperature of 60 ℃ and the speed of 320r/min for oxidation reaction for 2.5 hours to obtain a solution A;
the addition amount of the sodium chlorate and Fe in the leaching solution2+Is 0.4: 1;
(b) adjusting the pH value of the solution A to 3.5 by using ammonium bicarbonate, carrying out neutralization reaction for 4 hours at 75 ℃ and 320r/min, wherein the final pH value after the reaction is 3.5, and then filtering to obtain the cobalt salt sulfuric acid leaching solution after impurity removal.
Example 2
An impurity removal method for cobalt ore and crude cobalt salt sulfuric acid leaching solution comprises the following steps:
(a) providing 1000ml of cobalt ore and a crude cobalt salt sulfuric acid leaching solution, and then adding sodium chlorate into the leaching solution at the temperature of 62 ℃ and the speed of 320r/min for oxidation reaction for 1.5h to obtain a solution A;
the addition amount of the sodium chlorate and Fe in the leaching solution2+Is 0.6: 1;
(b) adjusting the pH value of the solution A to 3.8 by using ammonium bicarbonate, carrying out neutralization reaction for 5 hours at the temperature of 75-85 ℃ and at the speed of 300-350 r/min, wherein the final pH value is 3.8 after the reaction, and then filtering to obtain the cobalt salt sulfuric acid leaching solution after impurity removal.
Example 3
An impurity removal method for cobalt ore and crude cobalt salt sulfuric acid leaching solution comprises the following steps:
(a) providing 1000ml of cobalt ore and a crude cobalt salt sulfuric acid leaching solution, and then adding sodium chlorate into the leaching solution for oxidation reaction for 2 hours at 65 ℃ and 320r/min to obtain a solution A;
the addition amount of the sodium chlorate and Fe in the leaching solution2+Is 0.4: 1;
(b) adjusting the pH value of the solution A to 4.0 by using ammonium bicarbonate, carrying out neutralization reaction for 3 hours at 80 ℃ and 320r/min, wherein the final pH value is 4 after the reaction, and then filtering to obtain the cobalt salt sulfuric acid leaching solution after impurity removal.
Example 4
This example is the same as example 3 except that the neutralization reaction time in step (b) is 4 hours.
Example 5
This example is the same as example 3 except that the neutralization reaction time in step (b) is 5 hours.
Example 6
This example is the same as example 3 except that the neutralization reaction time in step (b) is 1 hour.
Example 7
This example is the same as example 3 except that the neutralization reaction time in step (b) is 2 hours.
Experimental example 1
In order to show that the desiliconization method for the cobalt ore and the crude cobalt salt sulfuric acid leaching solution can effectively remove silicon and iron elements in the cobalt ore and the crude cobalt salt sulfuric acid leaching solution and improve the filtering performance of the leaching solution, the cobalt ore and the crude cobalt salt sulfuric acid leaching solution treated by the desiliconization method in the embodiment 3-7 are subjected to effect analysis, and specific results are as follows:
from the data, the leachate treated by the silicon removal method in the embodiment 3 of the application is filtered after reacting for 3 hours, the filtering speed is fast and the filtering can be finished after 11 minutes, the iron content in the filtrate is less than or equal to 0.01g/L, and the silicon content is less than or equal to 0.10 g/L. When the reaction time is longer than 3 hours, the solution filtration rate and the ferrosilicon mass concentration do not change obviously. Taken together, the appropriate reaction time was determined to be 3 hours after the addition of ammonium bicarbonate. The filtrates of examples 6 and 7, in which the reaction time was less than 3 hours, had high contents of Si and Fe and poor filtration properties.
Example 8
This example removes the amount of sodium chlorate added in step (a) and the amount of Fe in the leachate2+Is 0.5: 1, the same as example 3.
Example 9
This example removes the amount of sodium chlorate added in step (a) and the amount of Fe in the leachate2+Is 0.2: 1, the same as example 3.
Example 10
This example removes the amount of sodium chlorate added in step (a) and the amount of Fe in the leachate2+Is 0.3: 1, the same as example 3.
Comparative example 1
In this embodiment, except for the step (b): the procedure of example 3 was repeated except that the pH of the solution A was adjusted to 4.0 with ammonium bicarbonate, the solution was subjected to neutralization reaction at 60 ℃ and 320r/min for 3 hours, the final pH after the reaction was 4, and then the solution was filtered to obtain cobalt ore and a crude cobalt sulfate leachate from which impurities were removed.
Comparative example 2
In this embodiment, except for the step (b): "example 3 is otherwise the same as example 3 except that the pH of the solution A was adjusted to 4.0 by ammonium bicarbonate, the neutralization reaction was carried out at 65 ℃ and 320r/min for 3 hours, the final pH after the reaction was 4, and then filtration was carried out to obtain the cobalt ore and the crude cobalt sulfate leachate after the impurities were removed.
Comparative example 3
In this embodiment, except for the step (b): the procedure of example 3 was repeated except that the pH of the solution A was adjusted to 4.0 with ammonium bicarbonate, the solution was subjected to neutralization reaction at 70 ℃ and 320r/min for 3 hours, the final pH after the reaction was 4, and then the solution was filtered to obtain cobalt ore and a crude cobalt sulfate leachate after impurity removal.
Comparative example 4
In this embodiment, except for the step (b): "example 3 is the same as example 3 except that the solution A is adjusted to pH 2.0 by ammonium bicarbonate, neutralized at 80 ℃ for 3 hours at 320r/min, and filtered to obtain the cobalt ore and the crude cobalt sulfate leachate after impurity removal, wherein the final pH value after reaction is 2.0.
Comparative example 5
In this embodiment, except for the step (b): "example 3 is the same as example 3 except that the solution A is adjusted to pH 3.0 by ammonium bicarbonate, neutralized at 60 ℃ for 3 hours at 320r/min, and filtered to obtain the cobalt ore and the crude cobalt sulfate leachate after impurity removal, wherein the final pH value after reaction is 3.0.
Experimental example 2
In order to show that the method for removing silicon from cobalt ore and crude cobalt salt sulfuric acid leaching solution can effectively remove silicon and iron elements in cobalt ore and crude cobalt salt sulfuric acid leaching solution and improve the filtering performance of the leaching solution, the cobalt ore and crude cobalt salt sulfuric acid leaching solution treated by the method for removing silicon in examples 3 and 8-10 and comparative examples 1-5 are subjected to effect analysis, and specific results are as follows:
as is clear from the comparison between the effects of the above examples 3 and 8 to 10, in examples 9 and 10, the amount of sodium chlorate added was equal to the amount of Fe in the leachate2+Is 0.2: 1 or 0.3: 1, the difficulty of filtration, indicates that Fe (OH) is produced3The amount of sol did not reach the polymerization degree of all silica sol, while in example 8 the amount of sodium chlorate added and the amount of Fe in the leachate2+Is 0.5: embodiment 1 has the same effect as embodiment 3, and the effect of embodiment 3 is better in view of overall economy.
As can be seen from the comparison of the effects of example 3 and comparative examples 1 to 5, in the embodiment of comparative examples 1 to 3, in which the neutralization reaction temperature is below 75 ℃, the iron content in the filtrate is high, which indicates that ferric iron ions do not reach the alum forming condition and ammoniojarosite cannot be formed. Comparative examples 4, 5 the embodiment where the pH of the neutralization reaction was below 3.5, the difficulty of filtration, illustrates that silica gel did not polymerize with the iron colloid at pH below 3.5.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. An impurity removal method for cobalt ore and crude cobalt salt sulfuric acid leaching solution is characterized by comprising the following steps:
(a) providing cobalt ore and a crude cobalt salt sulfuric acid leaching solution, and then adding an oxidant into the leaching solution for oxidation reaction to obtain a solution A;
(b) and adjusting the pH value of the solution A to 3.5-4.0 by using ammonium bicarbonate, carrying out neutralization reaction at the temperature of 75-85 ℃, and then carrying out solid-liquid separation to obtain the cobalt ore after impurity removal and a crude cobalt salt sulfuric acid leaching solution.
2. The method for removing impurities from a cobalt ore and crude cobalt salt sulfuric acid leach solution according to claim 1, wherein the cobalt ore and crude cobalt salt sulfuric acid leach solution is a leach solution with a silicon content of 1.3-1.8 g/L;
preferably, the pH value of the cobalt ore and the sulfuric acid leaching solution of the crude cobalt salt is 1.5-2.5.
3. The method for removing impurities from a cobalt ore and a crude cobalt salt sulfuric acid leaching solution according to claim 1, wherein the oxidant in the step (a) comprises at least one of hydrogen peroxide, potassium chlorate, sodium chlorate or air oxidation; sodium chlorate is preferred.
4. A process according to claim 3, wherein the amount of said oxidising agent added is Fe in the leach solution2+40-60 wt% of the mass.
5. The method for removing impurities from a cobalt ore and a crude cobalt salt sulfuric acid leaching solution according to claim 1, wherein the temperature of the oxidation reaction in the step (a) is 60-65 ℃, and the time of the oxidation reaction is 1.5-2.5 hours.
6. The method for removing impurities from a cobalt ore and a crude cobalt salt sulfuric acid leaching solution according to claim 1, wherein the time for the neutralization reaction in the step (b) is 3-5 hours.
7. The method for removing impurities from a cobalt ore and a crude cobalt salt sulfuric acid leaching solution according to claim 1, wherein the oxidation reaction in the step (a) is performed under the condition of stirring, and the stirring speed is preferably 300-350 r/min;
preferably, the neutralization reaction in the step (b) is carried out under the condition of stirring, and the stirring speed is preferably 300-350 r/min.
8. An impurity removal method for cobalt ore and crude cobalt salt sulfuric acid leach solution according to claim 1, wherein the separation method of solid-liquid separation comprises at least one of air flotation, filtration and pressure filtration, preferably filtration.
9. A method according to claim 1, wherein the method comprises the following steps:
(a) providing cobalt ore and a crude cobalt salt sulfuric acid leaching solution, and then adding an oxidant into the leaching solution at the temperature of 60-65 ℃ for oxidation reaction for 1.5-2.5 hours to obtain a solution A;
the addition amount of the oxidant and Fe in the leaching solution2+The mass ratio of (A) to (B) is 0.4-0.6: 1;
(b) adjusting the pH value of the solution A to 3.5-4.0 by using ammonium bicarbonate, carrying out neutralization reaction for 3-5 h at the temperature of 75-85 ℃, and then filtering to obtain the cobalt ore after impurity removal and a crude cobalt salt sulfuric acid leaching solution.
10. Use of a method according to any one of claims 1 to 9 for the removal of impurities from a cobalt ore and a crude cobalt sulphate leach solution in a cobalt metal extraction process.
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| CN113862491A (en) * | 2021-10-11 | 2021-12-31 | 金川集团股份有限公司 | Method for synchronously removing iron, manganese, aluminum and silicon from high-silicon cobalt salt leaching slurry |
| CN115679117A (en) * | 2022-11-18 | 2023-02-03 | 金川集团股份有限公司 | Method for reducing cobalt content of iron-removing tailings of cobalt raw material leaching solution |
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