Red mud comprehensive utilization process

Abstract

The invention belongs to the field of industrial waste residue recycling, and particularly relates to a comprehensive utilization process of red mud. The method comprises the following steps: performing grading pretreatment on red mud slurry according to particle sizes to obtain coarse-particle red mud slurry and fine-particle red mud slurry; performing primary magnetic separation on the coarse-particle red mud slurry to obtain magnetic red mud and non-magnetic red mud I; adding a reducing agent and coal gangue into the magnetic red mud, mixing, extruding and granulating, shaping and screening, drying and preheating, reducing and roasting, water-quenching, ball-milling, carrying out secondary magnetic separation, and carrying out solid-liquid separation to obtain fine iron powder and non-magnetic red mud II; the non-magnetic red mud II is used for preparing a cementing material, and the non-magnetic red mud I is used for preparing ceramsite; the fine-particle red mud is used for preparing the red mud micro powder. According to the method, fine iron powder, the cementing material, the red mud micro powder and the ceramsite are produced through grading pretreatment, and comprehensive utilization of the red mud is achieved.

Description

technical field [0001] The invention belongs to the field of industrial waste residue reuse, and in particular relates to a red mud comprehensive utilization process. Background technique [0002] Red mud is the tailings produced in the process of producing alumina from bauxite. It is reddish brown because it contains a large amount of hematite, so it is called red mud. Red mud is a strong alkaline pollution source, which belongs to Class II general industrial solid waste. Red mud is mostly stored in the form of stockpiling, and the leakage of red mud accumulated by wet method will cause soil and water pollution, endangering the health of surrounding animals, plants and human beings. In dry accumulation, after the surface of the red mud is dehydrated and weathered, after air-drying, due to the extremely fine particle size, the dust flying with the wind is likely to cause air pollution. [0003] The main characteristics of red mud are strong alkalinity, complex composition ...

AI Technical Summary

Problems solved by technology

The red mud storage yard has brought huge economic burdens to enterprises, and at the same time caused serious environmental safety hazards

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