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Recovery of cobalt from cobalt secondary resources in preparation of cobalt tetroxide

Author: SongFu
Tutor: LiXinHai
School: Central South University
Course: Metallurgical Engineering
Keywords: Cobalt secondary resources Waste lithium -ion battery Scrap carbide CoCO3 Co3CO4
CLC: TF816
Type: Master's thesis
Year: 2010
Downloads: 160
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Abstract


Country every year due to the lack of resources of cobalt , nickel and cobalt ore and deep processing of foreign exchange to import resources . World cobalt consumption growth trend. China has become the world 's cobalt consumption . Recovery of cobalt from cobalt secondary resources , to achieve the the secondary resource recycling industrialization has imminent . Precursor of Lithium tetroxide drill waste lithium ion secondary batteries , waste carbide material , such as the preparation of secondary resources recycling cobalt cobalt ; solution after COCl2 with CoSO4 addition to iron , in addition to calcium , P204 extraction impurity the P507 extraction preparation of high purity cobalt chloride solution process and impurity effects . Waste lithium ion battery material using sodium hydroxide in addition to aluminum, sulfuric acid leached cobalt the hydrolyzable the Shen aluminum CoSO4 solution was prepared ; carbide powder using the calcined oxide , sodium hydroxide and the leaching of tungsten trioxide , hydrochloric acid, sulfuric acid leaching cobalt prepared CoSO4 solution . The results show that , immersed cobalt sulfate material from the lithium-ion optimal conditions : reaction temperature 80 ° C , reaction time 3 h , the hydrogen peroxide dosage coefficient 3.0 , sulfuric acid coefficients 2.4 Co leaching rate of more than 97% . Sodium hydroxide in the tungsten the leaching carbide oxide optimal conditions : the alkali dosage coefficient 2.6 , solid-liquid ratio 1:4 , reaction time 2.0h, the reaction temperature of 100 ° C , the leaching rate of up to 98 % or more . Cobalt in sulfuric acid leaching cobalt residue optimal conditions : leaching temperature of 100 ° C , the solid-liquid ratio of 1:4 the acid dosage factor of 1.8 , leaching time of 2 h . Cobalt leaching rate of more than 98% . Cobalt chloride solution prepared precipitate CoCO3, and Co3O4 powder after calcination was prepared . Lithium cobalt oxide Co3O4 powder particle size and morphology of the increasingly stringent requirements , this paper studied the reaction pH , reaction time , stirring speed of cobalt carbonate morphology and particle size ; tetroxide cobalt particle size and tap density of calcined process related factors were investigated . The results show that the reaction pH, reaction time , stirring speed of the impact of the morphology and particle size of cobalt carbonate significantly improve response time and reduce the mixing speed , the main factors to reduce the pH will help improve the of cobalt carbonate granularity and improve morphology ; affect the Co3O4 physical indicators in a certain range in a certain regularity , wherein the calcination temperature , the calcination time affect Co3O4 granularity and the tap density of the key factors .

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CLC: > Industrial Technology > Metallurgical Industry > Nonferrous metal smelting > Heavy metals smelting > Cobalt
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