水泥回转窑和RH炉用镁铬残砖中铬价态分析

Analysis on chemical valence of chromium in residual MgO-Cr_2O_3 bricks for cement rotary kilns and RH furnaces

为了弄清含铬耐火材料是否在使用过程中都会形成六价铬化合物,采用XRD、XPS和ICP等手段分析了水泥回转窑烧成带用镁铬残砖及RH炉(浸渍管)用镁铬残砖中Cr6+的存在情况。结果表明:水泥回转窑烧成带用镁铬残砖中有六价铬化合物存在,并且含量较高;RH炉(浸渍管)用镁铬残砖中没有发现六价铬化合物。这表明,并非在所有应用环境中含铬耐火材料都会生成六价铬化合物。

In order to investigate whether hexavalent chromium is formed in all Cr2O3-containing refractories during service,XRD,XPS and ICP were used to determine the chemical valence of chromium in residual MgO-Cr2O3 bricks for firing zone of cement rotary kilns and RH furnaces （snorkel）.The results show that Cr6＋is detected in the residual MgO-Cr2O3 bricks for cement rotary kilns,but not in the bricks for RH fur-naces,indicating that hexavalent chromium does not form in all applications of Cr2O3-containing refractories.