Extraction and Separation of Iron,Aluminum and Nickel from Electroplating Sludge by P204 Stepwise Extraction Process
Extraction and separation of iron,aluminum and heavy metal nickel from electroplating sludge by P204 stepwise extraction process was studied.The effect of pH on the extraction process was discussed.The results show that the leaching solution of electroplating sludge after pretreatment with sulfuric acid was rich in nickel,and the insoluble substances were mainly calcium sulfate and silicon.Using 20％P204+80％sulfonated kerosene as organic phase,the extraction rates of Fe and Al can reach 99.9％and 97.6％,respectively,while the nickel loss rate is less than 2％under the conditons of VO/VA=1/1,electroplating sludge leaching solution nitial pH=0.9.When the pH of the raffinate is adjusted to 4.5,VO/VA=1/1,and the organic phase is 15％P204+85％sulfonated kerosene,the nickel extraction rate can reach 98％after four-stage extraction.The nickel-rich solution is obtained by four-stage strripping with 2 moL/L sulfuric acid,and nickel sulfate crystals with 22％nickel mass fraction are obtained by evaporation and crystallization.
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