Wet method for cobalt extraction

Jinchuan Nonferrous Metal Company extracting cobalt from cobalt residue, the process is used: acid leaching - sodium jarosite process iron extracted impurity P507 -P204 extraction separation of cobalt, nickel - cobalt oxalate precipitation - the production of cobalt oxide powder.
The process adopted by the Chengdu Electric Metallurgical Plant uses N235 to extract cobalt from the nickel slag leaching solution, remove impurities by ion exchange, and recover metal cobalt by electrowinning.
When Sumitomo Corporation of Japan recovers cobalt from cobalt-nickel ore leaching solution, it uses a neutralization precipitation method to remove iron and sulphur, and hydrogen sulfide removes copper , zinc , and tertiary carbon monocarboxylic acid to separate nickel and cobalt, and then converts it into chloride.
The literature [1] introduced the process: neutralization and iron removal - ammonia leaching separation - distillation separation of cobalt, nickel, nickel in the form of basic nickel carbonate precipitation, filtration, washing, drying, calcination into nickel oxide, and finally hydrogen Reduction to metallic nickel; cobalt is precipitated as cobalt hydroxide. Nickel and cobalt recovery rates can reach 95% to 96%.
In [2], for the refractory cobalt-containing waste containing copper, zinc, fission, nickel and other elements, the principle process of “reducing leaching-chemical decontamination-P204 deep decontamination-P507 extraction and separation of nickel and cobalt” is used to produce cobalt oxalate. The cobalt recovery was 95.61%.
Literature [3] introduced a new process for extracting cobalt oxide from the removal of cobalt slag from nickel electrolysis anolyte. After addition of cobalt sulfate reducing residue dissolved sodium jarosite process iron, P204 and extracted impurity extraction separation of cobalt, nickel, magnesium, calcium ammonium fluoride in addition, cobalt oxalate precipitation, calcination step, is not less than the total recovery of cobalt 92%, the total nickel recovery rate is not less than 95%.
Document [4] describes the process of extracting cobalt oxide from Co. Mn spent catalyst waste with a cobalt mass fraction of 9.44%. After the waste is dissolved in acid, excess ammonia water is added, and Mn 2 + is precipitated under the action of 10% hydrogen peroxide at pH=10 to form MnO(OH) 2 precipitate, and Co 2 + forms Co(NH 3 ) 4 2+ complex ions. To further remove traces of Mn from the solution, CoS was precipitated in a buffer system of pH = 3 with Na 2 S as a precipitant, and MnS hardly precipitated under these conditions. In the final CoS precipitation, the mass fraction of Mn is less than 0.6%, the mass fraction of other impurities is less than 0.5%, and the recovery rate of cobalt is above 92%. The CoS was dissolved in nitric acid at 70 to 80 ° C under a small reflux, filtered, and the filtrate was precipitated with oxalic acid at 80 ° C to precipitate cobalt, and calcined to obtain cobalt oxide.
According to the properties of lithium- ion secondary battery cathode material- aluminum- cobalt membrane raw material, the literature [5] proposed to decompose LiCoO 2 in sulfuric acid and hydrogen peroxide system. The reaction is:
2LiCoO 2 +3H 2 SO 4 +2O 2 =Li2SO 4 +2CoSO 4 +4H 2 O+O 2 ↑
The process of recovering cobalt is as follows: alkali leaching acid solution purifying cobalt, cobalt is recovered in the form of cobalt oxalate, and the direct recovery rate of cobalt is 95.7%.
Zhan Kezhen [6] used nitric acid and sulfuric acid to dissolve valuable metals such as Cu, Ni and Co in the waste residue. The leaching rate of Cu and Ni was over 99%, and the leaching rate of Co was 87%. The leachate was separated by iron powder replacement method, the iron was removed by the method of iron powder, the calcium removal by the NaF method, the deep removal of P204, and the separation of nickel and cobalt by P507. The recovery rates of Cu, Ni and Co were over 94%.
Uganda's first biological oxidation extraction plant, Kasese, was commissioned in 1999 to process concentrates containing 80% pyrite. After the first stage oxidation, the second stage oxidation was carried out with a medium iron-oxidizing strain, and the cobalt recovery rate was 92%.
The metallurgical laboratory of Beijing Research Institute of Mining and Metallurgy studied chlorine and cobalt leaching of copper-cobalt alloy, electrolysis copper removal, and TBP extraction and iron removal. The results show that copper recovery rate is high and cobalt loss is small.
Liao Chunfa of the Southern Institute of Metallurgy studied the process of extracting cobalt oxide from copper-iron-cobalt alloy slag, and determined the process conditions of alloy smelting, silicon removal, electrolytic refining, removal of impurities such as iron and copper, and alloy smelting can effectively remove the alloy. Silicon; electrolytic refining not only achieves the purpose of dissolving the alloy, but also has the effect of purifying and removing copper. The copper can be recovered in the form of sponge copper with a purity of 92.5% and a yield of over 99%.
For the leaching of cobalt from copper-cobalt alloy, at present, a sulfuric acid pressure leaching process or an electrolysis process is often used abroad. Finland's OMG is the world's first cobalt production company to process copper-cobalt alloys. The specific processing technology is unknown. Another company dealing with copper-cobalt alloys is the Chambishi cobalt smelter in Zambia, which uses a sulfuric acid pressure leaching process to produce CuSO 4 , CoSO 4 solution. Since the pressure leaching output is small and the equipment is demanding, there are few manufacturers.
Note:
[1] He Xianda, Guo Xueyi, Li Ping, et al. Recovery of nickel, cobalt and fission from synthetic diamond catalyst pickling solution [J]. Hydrometallurgy, 2005, 24(3): 150-154.
[2] Xie Fubiao. Production practice of comprehensive recovery of valuable elements in cobalt raw materials [J]. Mining and Metallurgy, 2001, 10 (3): 61-74.
[3] Qin Yunan. A new process for extracting cobalt oxide from electroless nickel-containing cobalt residue [J]. China Molybdenum Industry, 2001, 25(1): 43-46.
[4] Xia Wentang, Shi Haiyan. Experimental study on the leaching of cobalt and copper from cobalt, copper and cobalt alloys with non-polluting oxidants [J]. Mining and Metallurgy, 2006, 15 (3): 27-30.
[5] Zhong Haiyun, Li Jian, Chai Liyuan, Research on the recovery of cobalt from lithium ion secondary battery cathode scrap-aluminum cobalt film [J]. Rare metals and hard alloys, 2001, 1 (1): 1-4.
[6] 谌可颂. Research on recovery of cobalt, nickel and copper from waste slag [J]. Hunan Nonferrous Metals, 2006, 22 (6): 24-29.

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