Method and system for processing red mud

Abstract

The invention discloses a method and system for processing red mud. The method comprises the steps that (1) the red mud, reduction coal, a calcium system additive, a binding agent and water are mixed, and a mixed material is obtained; (2) the mixed material is subjected to pellet pressing, and a mixed pellet is obtained; (3) the mixed pellet is supplied to a feeding area of a rotary hearth furnace and made to sequentially pass a preheating area, a medium-temperature area and a high-temperature area of the rotary hearth furnace to be subjected to reduction, and an obtained metallized pellet is discharged through a discharging area; (4) the metallized pellet is supplied to a gas melt separation furnace to be subjected to melt separation processing, and metallic iron and melt separation slag are obtained; (5) the melt separation slag and quartz are mixed and then subjected to casting molding, and molded slag is obtained; and (6) the molded slag is subjected to nucleating-crystallization processing, so that microcrystal glass is obtained. According to the method for processing the red mud, the iron in the red mud is effectively extracted, in addition, the melt separation slag obtained in the melt separation process and the quart are mixed, molded and then subjected to nucleating-crystallization processing, and the microcrystal glass higher in economic value can be obtained.

Description

technical field

[0001] The invention belongs to the technical field of metallurgy, in particular, the invention relates to a method and system for processing red mud. Background technique

[0002] With the development of my country's alumina industry, the discharge and harm of red mud has become an urgent problem to be solved. How to effectively use red mud is imminent. At present, the annual production of red mud in the world has exceeded 70 million tons, and the amount of red mud produced in my country's alumina production process exceeds 15 million tons per year, all of which are stored in the open air, and most of the dams of the storage yard are constructed with red mud. With the development of the aluminum industry and the reduction of the grade of bauxite ore, the amount of red mud will increase, and red mud is an alkaline substance, which is easy to alkalize the land and pollute groundwater. Therefore, the comprehensive utilization of red mud is becoming increasingly...

Images