Iron removing device and method for nickel-cobalt raffinate
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A technology of raffinate and nickel-cobalt, which is applied in the field of hydrometallurgy, can solve the problems of heavy burden of follow-up process treatment, limited iron removal effect, high cost, etc., and achieves significant cost-effectiveness, reduced consumption of auxiliary materials, and strong process stability.
Inactive Publication Date: 2020-08-14
ZHEJIANG IND & TRADE VACATIONAL COLLEGE
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[0003] The purpose of the present invention is to provide a method for removing iron from nickel-cobalt raffinate, to solve the technical problems of high cost, serious pollution, limited iron removal effect and heavy burden of follow-up process in the iron removal process
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[0031] The invention provides a method for removing iron from nickel-cobalt raffinate, and the method for removing iron comprises the following steps;
[0032] Step 1, oxidation of Fe in the raffinate 2+ According to the nature of the leaching solution, select the corresponding nickel salt or cobalt salt. When Fe2+0.05-0.12g / L, the oxidation is considered complete; (if the leaching solution mainly contains Ni, choose nickel salt) as the oxidant, oxidant nickel salt or cobalt The origin of the salt is crude nickel hydroxide or hydroxide in Africa. Due to air oxidation during long-distance transportation, some nickel (cobalt) exists in a trivalent (high price) chemical state, which has strong oxidizing properties. During the reaction with raffinate, Fe can be rapidly oxidized 2+ , and a large amount of Ni is produced by leaching 2+ (Co 2+ ), thereby increasing the concentration of nickel (cobalt) metal ions in the raffinate. At the same time, because the nickel (cobalt) salt...
Embodiment 2
[0051] Embodiment 2 is the same as embodiment 1.
[0052] A certain cobalt ore leachate contains Co21g / L and total Fe5.2g / L (of which Fe 2+ 5.1g / L), Ni1.2g / L, and a small amount of other impurities.
[0053] Step 1, put an appropriate amount of crude cobalt hydroxide into the raffinate, control the reaction temperature at 50°C, and the reaction time for 5h. After the reaction is completed, Fe 2+ 0.07g / L, pH1.8.
[0054] Step 2: The iron removal section adopts 7 iron removal tanks for continuous operation with air exposure, the reaction temperature is controlled at 55°C, the total reaction time is 13 hours, and the mixed slurry with a mass concentration of 50% is used as a neutralizing agent.
[0055] Among them, the first stage adopts 4 iron removal tanks, and the slurry weight ratio quicklime:limestone=1:5; the second stage adopts 3 iron removal tanks, and the slurry weight ratio quicklime:limestone=1:1.5.
[0056] Step 3, one-stage iron removal 1 # Iron removal tank pH2....
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Abstract
The invention discloses an iron removing device and method for a nickel-cobalt raffinate. The iron removing device comprises an oxidation tank, a first-section iron removing tank, a first-section filter press, a second-section iron removing tank, a second-section filter press, an iron removing post liquid tank and a dilution tank, a raffinate inlet is formed in one side of the top of the oxidationtank, a nickel salt or cobalt sale addition port is formed in the other side of the top of the oxidation tank, a liquid outlet of the lower part of the oxidation tank communicates with a liquid inletof the first-section iron removing tank through a pipeline, a liquid outlet of the lower part of the iron removing tank communicates with a liquid inlet of the first-section filter press through a pipeline, and a liquid outlet of the first-section filter press communicates with a liquid inlet of the second-section iron removing tank through a pipeline. The oxidation property of crude nickel hydroxide is utilized, the crude nickel hydroxide is both an oxidant and valuable mineral material in the iron removing process, the zero cost of oxidant consumption in the iron removing process is achieved, meanwhile due to the consumption of acid in the self leaching process, the consumption of a neutralizer used in subsequent neutralization and hydrolysis iron removal is also greatly lowered, and the cost-effectiveness is remarkable.
Description
technical field [0001] The invention relates to the technical field of hydrometallurgy, in particular to iron removal equipment and a method for removing iron from nickel-cobalt raffinate. Background technique [0002] Nickel-cobalt ore is leached in hydrometallurgy to produce a leaching solution mainly containing Ni or Co ions. The leaching solution is generally first extracted from copper and then iron is removed. After the iron removal reaches the standard, it is sent to the nickel-cobalt extraction section. The liquid after extracting copper from the leaching liquid is generally called raffinate, and the raffinate contains main metal (Ni or Co) generally 20-25g / L, sulfuric acid 20-35g / L, and iron is generally mainly ferrous iron. 2-10g / L, the current common iron removal process is to first oxidize ferrous iron with hydrogen peroxide, and then use jarosite (sodium) jarosite or goethite to remove it, but the above methods have disadvantages, for example: first , it is dif...
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