铬铁矿氧化焙烧工艺的判定和评价

铬铁矿氧化焙烧工艺分为有钙焙烧、少钙焙烧和无钙焙烧3种。但是，由于铬盐生产厂家原料配比是保密的，所以很难判定其生产工艺是有钙焙烧还是无钙焙烧。经过多年的生产实践，总结出铬铁矿氧化焙烧工艺的判定条件，即：浸出残渣的配钙系数（氧化钙实际配入量与理论配入量的比值）、浸出残渣中6价铬的含量、浸出液中可溶性二氧化硅和三氧化二铝的浓度、碱的利用率、浸出渣产生量，为实现铬盐的产业结构调整提供帮助。

Determination and evaluation on oxidizing-roasting process of chromite

Oxidizing-roasting process of chromite is divided into calcium roasting,less calcium roasting,and non-calcium roasting.However,the raw material ratio of chromate manufacturers is confidential,so it is very difficult to determine that the production process is a calcium roasting or non-calcium roasting.After years of production practice,the determination condition of oxidizing-roasting process was summarized,that is,leaching residue of calcium distribution coefficient(the ratio of calcium oxide actual loaded and theory loaded),hexavalent chromium content in leaching residue,concentration of soluble SiO2 and Al2O3 in the leaching solution,alkali utilization ratio,and leaching residue quantity.The research is helpful to realize the adjustment of the industrial chromate structure.