利用工业酒精处理铬渣

Study on utilization of denatured alcohol for chromium slag treatment

利用工业酒精处理铬渣,使毒性大的Cr6+还原为毒性小的Cr3+,再用氨水中和,将Cr3+以Cr(OH)3的沉淀形式进行回收,从而达到铬渣的安全堆放。对Cr6+的解毒效果进行了单因素试验,得到最佳工艺条件:每10 g铬渣用酒精3 mL,酸度为0.5 mol/L,反应温度为40℃,反应时间为1 h。

Denatured alcohol was used to dispose the chromium slag and reduce the toxic Cr （Ⅵ） to less toxic Cr （Ⅲ）. When ammonium water （NH3·H2O） was added to the trivalent chromium solution, Cr（OH）3 was precipitated and recycled, which was safe to heap on the chromium slag. A single factor experiment was carried out to study the detoxifcation effect on Cr （VI）. The optimum condition for the process is 3 mL denatured alcohol per 10 g chromium slag, with an acidity （H＋） of 0.5 mol/L, a reaction temperature of 40℃, and a reaction time of 1 h.