Selective Precipitation of Cobalt by Activated Magnesium Oxide
In the process of cobalt extraction from Congo(Kinshasa)copper-cobalt polymetallic symbiotic ore,active magnesium oxide was selected to precipitate cobalt in cobalt containing solution and to prepare crude cobalt hydroxide.The kinetics of hydroxide precipitation in solution was discussed.The effects of particle size of magnesium oxide,the amount and method of adding magnesium oxide,reaction time and temperature on precipitation of iron,cobalt and manganese were investigated.The results show that the impurity iron in the simulated cobalt solution can be quickly removed by adding 30％hydrogen peroxide.Active magnesium oxide with particle size less than 45 μm is added to the simulated cobalt containing solution according to the addition amount of 0.68/1 and multiple additions by reaction at room temperature for 6 h,and the obtained primary precipitation can meet the requirements of industry standards for grade Ⅰ and secondary precipitation can meet the requirements of grade Ⅲ.The process has the advantages of low cost and high practicability,and can effectively improve the efficiency of magnesium oxide cobalt deposition.
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