The effect of calcium oxide and chlorine-containing reagents on extraction of indium during rotary-kiln processing of cakes

摘要

The paper gives the results of studying the effect of calcium oxide and chloride added to clinker after rotary-kiln processing of the indium residue containing cake from electrolyte zinc production on extraction of this metal at the rotary-kiln processing conditions. Indium extraction degree is shown to grow by 5 percent after adding calcium oxide (up to CaO/Fe(II) = 0,8 ratio) under carbothermic reduction in the temperature range of 1100-1300 deg C. Indium extraction increases up to 35-48 percent after replacing a part of calcium oxide by calcium chloride in the introduced additions (0,23 percent CaCl_2 to clinker weight). In this case the design chlorine content in the sublimates increases up to 0,3 percent.