Characteristics of Water Quenched Copper-containing Slag and Separation of Iron and Silicon from It

A mineralogical study of water quenched copper-containing slag was carried out with XRD,SEM,chemical analysis,etc.Fayalite is the major phase and copper exists in matte in the slag.The slag is amorphous,and its structure compact.The matte phase is not fully crystallized,its particle size is below 5 μm,iron and silicon exist mainly in fayalite,beneficiating method can not separate Fe and Si effectively.A new technology of rapid solid-phase reduction and high temperature smelting was proposed,and experiments were carried out.The experimental results show that the high copper and iron recovery rates can be achieved under the conditions of basity at 0.5,final smelting temperature of slag above 1300℃,smelting and separation temperature above 1350℃,and addition of additive,they are 93% and 87%,respectively.The iron and copper left in slag is less than 5% and 0.10% respectively.It means that the slag can be used as construction material,and the process can separate iron and copper,and the comprehensive utilization of copper slag can be achieved.