Method for preparing nickel salt through direct leaching of nickel oxide at normal pressure
A nickel oxide, normal pressure technology, applied in the direction of nickel sulfate, nickel halide, etc., to achieve the effect of reducing costs, simplifying the production process, and reducing the introduction of impurities
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Embodiment 1
[0020] Take 5g of nickel oxide and place it in a 250ml beaker, add 30ml of 1.84M sulfuric acid solution, stir and react for 1h at a temperature of 50°C, and gradually generate a large amount of yellow-green solid; add 5ml of concentrated sulfuric acid to continue the reaction for 1h; After completion, filter and wash the filter residue with distilled water to weak acidity, then heat and dissolve with 30ml of distilled water to form a clear nickel sulfate solution. The quality of the unreacted black solid raw material was 3.8g, and the nickel ion content in the solution was 30g / L.
Embodiment 2
[0022] Take 5g of nickel oxide and place it in a 250ml beaker, add 30ml of 5.5M sulfuric acid solution, stir and react for 1h at a reaction temperature of 100°C, and gradually generate a large amount of yellow-green solid; add 4ml of concentrated sulfuric acid to continue the reaction for 1h; After the reaction is completed, filter and wash the filter residue with distilled water to weak acidity, then heat and dissolve with 30ml of 2% hydrogen peroxide aqueous solution to form a clear solution. The quality of the unreacted black solid raw material was 1.7 g, and the nickel ion content in the solution was 80 g / L.
Embodiment 3
[0024] Take 5g of nickel oxide and put it in a 250ml beaker, add 30ml of 9.2M sulfuric acid solution. Under the condition that the reaction temperature was 80°C, the reaction was stirred for 1 h, and a large amount of yellow-green solid was gradually formed, and 3 ml of concentrated sulfuric acid was added to continue the reaction for 1 h. After the reaction was completed, there was basically no black solid raw material remaining, filtered, and the filter residue was washed with distilled water to weak acidity, and the solid residue was directly heated and dissolved with 30ml of 5% hydrogen peroxide aqueous solution to form a clear solution. The nickel ion content in the solution is 121g / L.
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