METHOD FOR RECOVERING VALUABLE COMPONENTS FROM MIXED SLAG CONTAINING ZINC AND IRON

摘要

A method for recovering valuable components from mixed slag containing zinc and iron, comprising the following steps: S1, adding zinc smelting slag into a heat preservation device or into a smelting reaction device from which slag may flow out, adding one or more of lead smelting slag, blast furnace slag, steel slag and iron alloy slag so as to form mixed slag, heating the mixed slag to a molten state so as to form reaction slag, monitoring the reaction slag in real time, and obtaining the slag after a reaction is completed by regulating and controlling the temperature of the reaction slag and the specific value of alkalinity CaO/SiO₂; and S2, performing sedimentation separation on the slag obtained in step S1 to obtain smoke dust containing a ferrous silicate mineral phase, a copper-rich phase and an iron-rich phase, generate smoke dust containing the components of zinc, lead, indium and bismuth, and migrating and enriching gold and silver components to enter the copper-rich phase; and carrying out recovery processing for all phases. With the described method, the copper contained in slag may be lowered (the copper contained in the slag being less than 0.1 wt%); valuable components may be recovered efficiently and low-copper content materials containing iron are obtained; the metal recovery rate is high, the production cost is low, environmental friendliness is achieved, and the economic returns are high.