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Method for activating fly ash by high-temperature microwave

A technology of microwave activation and fly ash, which is applied to the removal of aluminum chloride, aluminum halide, and solid waste, can solve the problems of secondary pollution of waste slag, large amount of additives, and long calcination time to reduce energy consumption. Low consumption, high energy utilization rate, beneficial to the effect of reuse

Inactive Publication Date: 2011-01-19
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The key to extracting aluminum and other valuable elements from fly ash is to reduce the activation energy consumption of fly ash and ensure the extraction rate. The large amount of input and other problems not only increase the cost, but also generate a large amount of waste residue to form secondary pollution, thus restricting the large-scale application of these technologies in industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Adjust the calcium oxide (CaO) of fly ash: aluminum oxide (Al 2 o 3 ) to a mass ratio of 0.27, and ground to a fineness of less than 75 microns, preheated to 150°C, then loaded with microwaves, calcined at 800°C for 60 minutes, quenched, crushed, and hydrochloric acid with a concentration of 20% by mass, at 100°C After leaching for 30 minutes, the leaching rate of aluminum element was 75.4%.

Embodiment 2

[0036] Adjust the calcium oxide (CaO) of fly ash: aluminum oxide (Al 2 o 3 ) to a mass ratio of 0.35, and ground to a fineness of less than 75 microns, preheated to 600°C, then loaded with microwaves, calcined at 1000°C for 5 minutes, quenched, pulverized, and hydrochloric acid with a concentration of 25% by mass, at 75°C After leaching for 30 minutes, the leaching rate of aluminum element was 85.1%.

Embodiment 3

[0038] Adjust the calcium oxide (CaO) of fly ash: aluminum oxide (Al 2 o 3 ) to a mass ratio of 0.35, and ground to a fineness of less than 75 microns, preheated to 400°C, then loaded with microwaves, calcined at 900°C for 60 minutes, quenched, pulverized, and hydrochloric acid with a concentration of 20% by mass, at 120°C After leaching for 10 minutes, the leaching rate of aluminum element was 91.22%.

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Abstract

The invention relates to the technical field of changing solid wastes into useful things, in particular to a method for activating fly ash by high-temperature microwave. The method comprises the following steps: (1) adjusting the mass ratio of calcium oxide to aluminum oxide in the fly ash; (2) evenly mixing the calcium oxide with the aluminum oxide, and grinding the obtained mixture until fineness is less than 75 micrometers; (3) controlling water content of the mixture at less than 1%; (4) preheating the mixture; (5) calcining the preheated mixture by the high-temperature microwave; (6) quenching, sintering and grinding clinker until the fineness is less than 75 micrometers; and (7) extracting with hydrochloric acid or sulfuric acid to obtain aluminum chloride solution or aluminum sulfate solution. The method of the invention has the positive effects that by the characteristics of high energy utilization rate of external microwave field and direct action of energy on materials, the fly ash can be treated in a shorter time, thus realizing efficient activation of the fly ash, being beneficial to extraction of the aluminum oxide with extraction rate of more than 75%, lowering energy consumption and promoting reutilization of the fly ash.

Description

【Technical field】 [0001] The invention relates to the technical field of converting solid waste into useful or harmless things, in particular, it relates to a method for activating fly ash by using high-temperature microwaves. 【Background technique】 [0002] China is one of the countries with the largest coal resources in the world. Coal accounts for more than 70% of the structure of energy consumption, with a consumption of 2 billion tons. Coal will continue to be the main energy source in my country for a long time to come. [0003] About 98% of my country's coal utilization is achieved through combustion, and a large amount of fly ash is produced during the coal combustion process, and fly ash accounts for 10-40% of the raw coal mass. There are about 100 million tons of fly ash accumulated in my country every year, and the cumulative accumulation has exceeded 2.7 billion tons. Fly ash has become one of the industrial wastes with the largest accumulated storage and land o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/56B09B3/00
Inventor 于建国乔秀臣
Owner EAST CHINA UNIV OF SCI & TECH