Method for comprehensively utilizing alumina red mud

Abstract

The invention relates to a method for processing the content of alkali in alumina red mud. The method comprises the following steps of: 1, pulping the alumina red mud, and feeding slurry into a dealkalization reaction tank; 2, dealkalizing: adding a dealkalizing agent into the red mud slurry, uniformly stirring, rapidly reacting the dealkalizing agent in the reaction tank, and carrying out solid-liquid separation after reacting; 3, roasting and reducing: reducing the dealkalized red mud by adopting an iron oxide roasting and reducing process; and 4, magnetically separating: feeding the red mud into a magnetic separator by using a mortar pump so that the red mud is separated into magnetic red mud and non-magnetic red mud, feeding the magnetic red mud into a ball mill to be ball-milled, after filter-pressing and drying the non-magnetic red mud, taking the non-magnetic red mud separated through magnetic separation for two times as medium and fine sands for dry mortar, for later use, and exciting and activating components of SiO2 and AL2O3 in the red mud by adding alkaline materials, such as carbide slag or limestone powder and the like. The method disclosed by the invention has the characteristics of simple process and low investment, so that the alkali content in the red mud is greatly reduced.

Description

technical field [0001] The invention belongs to the field of industrial waste residue reuse, and in particular relates to a method for comprehensive utilization of alumina red mud. Background technique [0002] Red mud is the polluting waste that is removed when the aluminum industry extracts alumina. Generally, for every 1 ton of alumina produced, 1.0 to 2.0 tons of red mud is incidentally produced. my country is a big producer of alumina. In 2009, it produced more than 23 million tons of alumina, accounting for about 30% of the world's total output, and produced nearly 30 million tons of red mud. At present, the comprehensive utilization of red mud in my country is less than 4.0%, and the accumulated stockpile reaches 200 million tons. With the increase of alumina production in my country and the gradual reduction of bauxite products, the annual output of red mud will continue to increase. It is estimated that by 2015, the cumulative stockpiles of red mud will reach 350 ...

AI Technical Summary

Problems solved by technology

With the increase of alumina production in my country and the gradual reduction of bauxite products, the annual output of red mud will continue to increase. It is estimated that by 2015, the cumulative stockpiles of red mud will reach 350 million tons. The large stockpiles of red mud, It not only occupies land, wastes resources, but also easily causes environmental pollution and potential safety hazards

In view of this, many research institutions at home and abroad are actively carrying out research and development on the comprehensive utilization of red mud, and have also achieved some results, but so far none of them can truly achieve large-scale industrial application, let alone any Achievements The utilization of red mud exceeds 30%