硫化砷渣中砷浸出特性研究＊

摘要

Through the horizontal oscillation toxicity characteristic leaching experiment,leaching of arsenic in arsenic sulfide residue under different liquid pH and Ca/As ratio (molar ratio )conditions was studied.The experimental results showed that different pH and Ca/As ratio of the leaching liquid have great influence on As leaching concentration.When pH of the solution was in the 1.01 to 13.12 range,with the increase of pH value of leaching solution,the concentration of As in the leaching solution firstly decreased and then increased.When pH was equal to 1 1 .9 1 ,the concentration of arsenic reached the minimum value of 4.27g/L. When the Ca/As ratio increased,the leaching concentrations of As increased firstly and then decreased. When Ca/As was equal to 1.405,the concentration of arsenic had maximum value of 31.674g/L. Overall,when the Ca/As ratio was in the 0.187 to 5.619 range,by adding CaO,macroeconomic perform-ance is to promote As dissolution from arsenic sulfide residue.%通过水平振荡毒性浸出试验，研究了硫化砷渣在不同的pH值和n（Ca）／n（As）下As的浸出。结果表明：浸出液pH值和n（Ca）／n（As）的不同，会对As的浸出质量浓度产生较大影响，pH在1.01～13.12范围内时，随着pH值的增大，浸出液As的质量浓度先减小后增加，在pH＝11.91时，达到最小值4.27 g／L；而随着n（Ca）／n（As）的增加，As的浸出质量浓度先增大后减小，在n（Ca）／n （As）＝1.405时出现最大值，As浸出质量浓度为31.674 g／L。但总体来说n（Ca）／n（As）在（0.187～5.619）范围内，加入CaO宏观表现为促进硫化砷渣中As的溶出。