Experimental Study on the Recovery of Zinc from P204 Zinc-Containing Raffinate
P204 extractant is an organic phosphorus compound commonly used for separating and extracting zinc,with high extraction efficiency and selectivity.The experiment uses the zinc precipitation process to recover zinc from P204 zinc-containing raffinate.The results show that when the pH is not less than 8.5,zinc completely precipitates and the zinc content in the filtrate decreases to below 1 mg/L.When the acid soluble pH of the zinc slag is 2.0,the zinc content of the leaching slag is not greater than 0.1％.The impurity content in the acid soluble solution of zinc slag is relatively high,and a new type of agent,sodium dimethyl dithiocarbamate,can be used to remove impurities.The dosage of sodium dimethyl dithiocarbamate is 1.5 times the theoretical amount,and the dosage of sodium nitrite is 1 time the theoretical amount,which can achieve synchronous removal of Cu,Cd,Ni,and Co,meeting the requirements of zinc electroplating for impurities,and the solution of sodium dimethyl dithiocarbamate purification-oil removal is electrodeposited,and the quality of most zinc ingots obtained meet the indicator requirements of No.1 zinc(zinc content not less than 99.99％).
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