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

A porous adsorption material, red mud technology, applied in chemical instruments and methods, adsorption water/sewage treatment, inorganic chemistry, etc. problems, to achieve good water resistance strength, rich pores, and shorten the treatment process.

Inactive Publication Date: 2013-02-06
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] According to the binder being 8% of the mass of red mud (dry weight ratio w / w), the red mud waste slag and cement with a water content of 40% after being filtered from the alumina plant are mixed evenly, and then kneaded by hand until the particle size is 5~ 10mm granular, the red mud particles are activated by microwave with an energy specific power of 0.5w / g at an activation temperature of 80°C for 30 minutes to obtain a porous adsorption material. The pore volume is 0.0887 ml / g, and the specific surface area is 19.32m 2 / g.

Embodiment 2

[0023] According to the binder being 2% of the mass of red mud (dry weight ratio w / w), mix the red mud residue with a water content of 20% filtered by the alumina plant and polyacrylamide evenly, and then use a granulator to knead to the particle size It is in the granular form of 0.1-5mm, and the red mud particles are activated by microwave with an energy specific power of 0.2w / g at an activation temperature of 200°C for 10 minutes to obtain a porous adsorption material. The pore volume is 0.0924 ml / g, and the specific surface area is 21.12m 2 / g.

Embodiment 3

[0025] According to the binder being 10% of the red mud mass (dry weight ratio w / w), the red mud waste slag filtered by the alumina plant with a water content of 50% and cement are evenly mixed, and then kneaded by a granulator until the particle size is 1 ~5mm granular, the red mud particles are activated by microwave with an energy specific power of 10w / g at an activation temperature of 500°C for 5 minutes to obtain a porous adsorption material. The pore volume is 0.0947 ml / g, and the specific surface area is 23.15m 2 / g.

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/10B01J20/28B01J20/30C02F1/28
Inventor 巨少华卢帅丹彭金辉张利波
Owner KUNMING UNIV OF SCI & TECH
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