Process for preparing arsenic-removing composite materials from red mud

Abstract

The invention discloses a process for preparing composite materials for removing arsenic from red mud. The process is characterized by comprising the steps of (1) adding the red mud slurry as raw materials to a diluted hydrochloric acid solution, heating to 80 DEG C-90 DEG C, and stirring; (2) after stirring, then cooling the mixture, filtering pickled red mud solids and filtrate, and then washing red mud solids with water; and (3) adding a reducing agent into red mud solids washed with water in step (2), carrying out a reduction reaction, and filtering after the reduction reaction is completed to obtain the obtained composite material for removing arsenic. Since the industrial red mud waste is used as the raw materials, the process disclosed by the method is environment friendly; the convenient preparation process is convenient and rapid and is conducive to large-scale production, and the obtained composite material has an excellent arsenic removal effect.

Description

technical field [0001] The invention relates to the field of material engineering, in particular to a process for preparing arsenic-removing composite materials by utilizing industrial red mud waste residues. Background technique [0002] Arsenic and its compounds are one of the main pollutants in industrial wastewater. Symptoms of acute arsenic poisoning include nausea, vomiting, metallic taste in the mouth, severe abdominal pain, etc. In severe cases, dizziness, gastrocnemius spasm, cyanosis and even Shock, in severe cases, symptoms of central nervous paralysis, painful spasms of limbs, loss of consciousness, etc. [0003] Red mud is the polluting waste slag discharged when the aluminum industry extracts alumina. Generally, for every ton of alumina produced, 1.0 to 2.0 tons of red mud are incidentally produced. As the world's fourth largest producer of alumina, China discharges millions of tons of red mud every year. A large amount of red mud cannot be fully and effectiv...

AI Technical Summary

Problems solved by technology

However, iron is ferromagnetic, and nano-iron particles will aggregate without a carrier, reducing the specific surface area of ​​the reaction, thereby reducing the efficiency of arsenic treatment

In addition, in the prior art, raw materials such as iron salt need to be purchased, and the preparation cost of nano-iron particles is relatively high, which is not conducive to its promotion and application in the field of arsenic removal.

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