Method for treating electroplating sludge containing Cr, Fe and Ca

The invention relates to amethod for treating electroplating sludge containing Cr, Fe and Ca, and belongs to the technical field of electroplating sludge treatment. According to the method, a medium-low temperature alkaline roasting and hydrothermal methodcombined technique is adopted to recover valuable metal Cr, andthe particle size of the sludge is changed by a hydrothermal method, and furthermore the removal of chromium in the electroplating sludge is improved. According to the method, iron is recycled and high-purity iron oxide red pigment is prepared while the electroplating sludge is subjected to dechromisation treatment, and the operation steps are simple. 本发明涉及一种含Cr、Fe、Ca的电镀污泥的处理方法，属于电镀污泥的处理技术领域。一种含Cr、Fe、Ca的电镀污泥的处理方法，采用中低温碱性焙烧和水热法联用工艺，回收有价金属Cr，而且通过水热法改变污泥颗粒尺寸，进而增加电镀污泥中铬的脱除。本发明在对电镀污泥脱铬处理的同时也对铁进行了回收并制得高纯度氧化铁红颜料，操作步骤简单。