Red mud modification method, modified product and its application in adsorption of brilliant blue dye

Abstract

The invention relates to a red mud modification method, a modified product and its application in absorbing brilliant blue dye, and the red mud modification method, the steps of which include pretreatment and LDO synthesis. The beneficial effects of the present invention are: by reusing the red mud, an LDO adsorbent with a larger specific surface area and capable of accommodating a large amount of anionic dyes is prepared, the preparation process requires less additional materials, the process is simple, and the success rate is high. And LDO has a high adsorption and removal rate for simulated wastewater. For 50mg / L brilliant blue dye simulated wastewater, the removal rate of 0.1gLDO can reach more than 98%, which is far higher than the highest removal rate of red mud38 %, 22% of roasted red mud and 89% of LDH; especially for 400mg / L simulated wastewater, the highest adsorption capacity of LDO can reach 170mg / g, which has a high use value.

Description

technical field [0001] The invention belongs to the research field of adsorbent materials, and in particular relates to a red mud modification method, a modified product and its application in absorbing brilliant blue dyes. Background technique [0002] Red mud (Red Mud, referred to as RM) is the waste residue produced in the alumina production process. Because of its red appearance, it is called red mud. At present, an average of 1-2 tons (dry weight) of red mud is discharged for every 1 ton of alumina produced. In recent years, my country's alumina industry has developed rapidly. According to the annual report released by Aluminum Corporation of China, my country's alumina production in 2011 was 38.81 million tons, accounting for about 30% of the world's total output, and the red mud produced was more than 40 million tons. ; At present, the comprehensive utilization rate of red mud in my country is only 4%, and the cumulative stockpiles have reached 250 million tons. With...

AI Technical Summary

Problems solved by technology

With the annual increase of alumina production in my country and the gradual decrease of bauxite grade, the annual production of red mud will continue to increase. The long-term accumulation of a large amount of red mud not only occupies land resources, but also brings many ecological and environmental problems. and security risks

How to solve the environmental, safety and resource waste problems caused by its large stockpiling is currently a hot topic in academic and industrial research.

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