皮革厂含铬污泥铬回收及资源化利用

Chrome recovery and recycling of tannery sludge containing chromium

以滨州某皮革厂产生的含铬污泥为研究对象,采用酸浸-加碱-氧化的方法提取污泥中的铬,通过实验探究获得最佳反应条件,铬回收率达到92.6%。回收得到的的铬盐红矾钠(Na_2Cr_2O_7)可回用于制革产业中制备铬鞣剂。铬回收后污泥中的铬含量为10.88 mg·g^(-1),浸出毒性低于危险废物鉴别标准。

In this study, chromium sludge produced by a tannery in Binzhou was taken as the research object.The acid leaching-alkalifying-oxidizing method was adopted to extract chromium from the sludge.Through the experiment, the best reaction conditions were determined, and the chromium recovery rate reached 92.6%.The recovered chromic salt of sodium dichromate （Na2Cr2O7） can be reused in the preparation of chrome tanning agent in the tannery.In addition, the content of chromium remaining in the sludge was 10.88 mg·g-1, and the leaching toxicity was lower than the hazardous waste identification standard.