Method for preparing porous adsorption material by using microwave low-temperature pore-forming activated granular red mud

Abstract

The invention provides a method for preparing a porous adsorption material by using microwave low-temperature pore-forming activated granular red mud. The method comprises the following steps: taking a bonding agent which is 2-10 percent of mass of the red mud, uniformly mixing red mud wastes and the bonding agent, kneading into grains by using a granulator or by a hand and activating the red mud grains for 5-30 minutes at an activation temperature of 80-500 DEG C by utilizing microwaves to obtain the porous adsorption material. The red mud is activated by utilizing the selective heating and resonant sintering effects of the microwaves on iron and other matters in the red mud. The porous adsorption material prepared by the method has a pore volume of more than 0.0826 ml / g and a specific surface area of 18.62-24.25 m2 / g, and the grain size can be different as required. The produced porous adsorption material has the characteristics of fine grain, high porosity, large surface area, strong hydroscopicity, good temperature-resistant stability and low cost and has the great advantage in aspect of wastewater adsorption and treatment.

Description

technical field [0001] The invention relates to the technical field of utilization of nonferrous metallurgical waste residues, in particular to a method for preparing porous adsorption materials by microwave low-temperature pore-forming and activating granular red mud. Background technique [0002] Red mud is a very fine-grained strong alkaline solid waste produced during the production of alumina from bauxite. For every ton of alumina produced, about 0.8 to 1.5 tons of red mud are produced. my country is a big producer of alumina. In 2009, it produced 23.78 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 rate of red mud in my country is only 4%, and the cumulative stockpiles have reached 200 million tons. 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 ...

AI Technical Summary

Problems solved by technology

However, due to key problems such as separation / granulation difficulties, activation difficulties, unclear adsorption / desorption mechanism, and low efficiency, industrialization cannot be realized.