Extraction method for removing calcium and magnesium from copper-cobalt ore leachate

Abstract

The process of extracting Co and eliminating Ca from copper-cobalt ore includes obtaining mixture leachate with soluble sulfate of Co, Ni, Ca and Mg; and extracting the mixture leachate with organic solvent, which comprises organic matter bis(2-ethyl hexyl) phosphoric acid or ”�2- ethyl hexyl phosphonate ester in 15-25 vol% and kerosene in 75-85 vol%. The organic solvent extracting procedure includes two steps, the first step of transferring Ca into the organic phase while leaving Co, Ni and Mg in the water phase, and the second step of transferring Co to the organic phase while leaving Ni and Mg in the water phase. The process can obtain cobalt sulfate solution with Co content up to 90-100 g / l, Ca ion content lowered to 0.01 g / l, Ni ion content lowered to 0.005 g / l, and Mg ion content lowered to 0.1 g / l and suitable for producing T-cobalt oxide and cobalt salt.

Description

technical field [0001] The invention relates to a method for extracting cobalt, in particular to a method for extracting and removing calcium and magnesium from a copper-cobalt ore leaching solution. Background technique [0002] The acid-dissolved leaching solution of copper-cobalt ore is generally purified and removed by a combination of traditional chemical precipitation purification and solvent extraction. The process is: a solution containing cobalt and impurities Ni, Fe, Ca, Mg, Cu, Mn, Zn, etc. First remove iron by oxidation and neutralization, remove calcium and magnesium by reagent precipitation, and then remove impurities and separate cobalt and nickel by solvent extraction. [0003] Reagent precipitation removes calcium and magnesium. The current general method is to add sodium fluoride or ammonium fluoride to form insoluble fluoride precipitates between calcium and magnesium and fluorine, which are removed by filtration. The disadvantages of this method are: (1)...

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: (1) the solubility of sodium fluoride is small, the reaction time is long, heating is required, the energy consumption of the reaction is large, and the precipitation and filtration performance of the fluoride generated is poor; (2) sodium fluoride or ammonium fluoride is expensive, The cost of purifying and removing calcium and magnesium is relatively high; (3) due to the relatively small solubility product of cobalt fluoride in water, when sodium fluoride or ammonium fluoride precipitation method is used to remove calcium and magnesium, a certain amount of cobalt also generates cobalt fluoride precipitation into the slag, resulting in a reduction in the yield of cobalt; (4) fluorine in the wastewater, resulting in difficulties in wastewater treatment

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