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一、前言以废高温合金及废不锈钢为原料生产电解镍(钻)必须除去其中所含的铬。湿法净化除铬一般用中和法,生产中常有以下两种处理方法:(1)和铁在一道工序去除,即先氧化水解除铁,继而中和水解除铬,并利用Fe(OH)_3胶体的吸附作用以加速Cr(OH)_3的聚沉,反应终点pH值为4.7～4.9,可达到深度净化除铬。生成的铁铬渣(混合渣)含Ni(Co)量随
First, the preface to waste high-temperature alloy and scrap stainless steel as raw material for the production of electrolytic nickel (diamond) which must remove the chromium contained. In addition to the general use of wet purification of chromium and neutralization, production often have the following two kinds of treatment: (1) and iron in a process to remove, that is, the first oxidative hydrolysis of iron, then neutralize the hydrolysis of chromium, and the use of Fe (OH) _3 colloidal adsorption to accelerate the precipitation of Cr (OH) _3, the end of the reaction pH value of 4.7 to 4.9, in-depth purification can be achieved in addition to chromium. The resulting iron chromium slag (mixed slag) with Ni (Co) content with