【摘要】 以高砷锌烟灰为原料,采用低温硫酸化焙烧工艺,使烟灰中的砷以As₂O₃形式挥发逸出,经收尘系统收集。锌、铟、锗等有价金属在焙烧过程中转变为硫酸盐,实现了与砷的分离。考察了硫酸用量、温度、焙烧时间对脱砷的影响。结果表明,硫酸用量1.2倍理论量,温度300℃,焙烧时间3 h,焙烧过程砷的脱除率达78.28%。焙砂浸出时进入溶液中的少量砷与溶液中同时被浸出的少量铁一起通过氧化水解形成砷铁渣沉淀。砷铁渣与原矿混合后再经硫酸化焙烧,砷的脱除率达70.39%。更多还原

【Abstract】 The low-temperature sulfation roasting process was chosen to make the arsenic in arsenic-rich zinc dust volatilized out as As₂O₃ and collected by dust collection system.Zinc,indium and germanium were transformed into sulfates to achieve the separation with arsenic.The factors investigated under batch test conditions included amount of sulfuric acid,roasting temperature and time.The optimum amount of sulfuric acid,roasting temperature and time were found to be 1.2 times the theoretical amount,300 ℃ and 3 h respectively,under these conditions the arsenic removal ratio reached 78.28%.A small amount of arsenic leached into the solution during the calcination leaching process was precipitated with iron by oxidative-hydrolysis precipitation.Arsenic-iron slag was mixed with the zinc dust and roasted again,the removal ratio of arsenic reached 70.39%.更多还原