Comprehensive Processing of Saline Aluminum-Containing Slag

A method is developed for processing saline aluminum-containing slag based on leaching and electrolysis of solid residue after leaching in molten fluoride with preparation of a deoxidizing alloy for steel. Saline solution is evaporated with preparation of a covering and/or covering-refining flux. In the course of pilot plant tests, optimum process conditions are clarified for aqueous leaching of saline aluminum-containing slag, and a test batch of alloy-deoxidizing agent is obtained that is used at the Electrostal Heavy Engineering Plant. The best results are achieved with the following leaching regime: temperature 60°C, size 150 μm, duration 80 min, and S:L = 2:1. Current efficiency 87%.