关键词: 铜渣, 直接还原, 铁钼合金

Abstract: In a copper smelter in Hubei Province， the iron grade and molybdenum grade are 35.37% and 0.30% respectively. The iron mainly exists in the form of magnetite and forsterite， and the molybdenum mainly exists in the form of oxide，forming chemical bond with Si and Fe in the slag. If direct magnetic separation is used to recover iron and conventional flotation is used to recover molybdenum， neither iron nor molybdenum can be effectively recovered. In order to maximize the recovery and reuse of iron and molybdenum resources in copper slag， ferromolybdenum alloy was prepared by smelting direct reduction process with coal powder as reducing agent， calcium oxide and alumina as slag making agent， so as to recover iron and molybdenum from copper slag. The effects of reduction temperature， reduction time， amount of coal powder， amount of calcium oxide and amount of alumina on the recovery and grade of Fe and Mo in the alloy were discussed. The results showed that the recovery of Fe and Mo in the alloy is 89.03% and 98.44% respectively， and the grade is 91.70% and 0.86% respectively under the optimized conditions of reduction temperature of 1 400 ℃， reduction time of 60 min， coal powder consumption， calcium oxide consumption and alumina consumption respectively 20%， 20% and 10% of copper slag.

Key words: copper slag, direct reduction, ferromolybdenum alloy