Method for extracting aluminum oxide from fly ash based on ammonium sulfate activation process

A technology of fly ash and ammonium sulfate, applied in alumina/aluminum hydroxide and other directions, can solve the problems of large equipment investment, long process chain, material melting and sticking to the wall, etc., so as to improve the extraction rate and purity, and solve the problem of melting and sticking. , the effect of shortening the process chain

Active Publication Date: 2012-07-18
CHINA SHENHUA ENERGY CO LTD +2
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Problems solved by technology

[0008] In the process of extracting alumina by acid leaching or sintering alkali fusion, in order to remove impurities in the solution, the Bayer method in the alumina industry is basically used to remove impurities, resulting in a long process chain, large equipment investment, and energy consumption. At the same time, whether it is the mixing of fly ash and activating material at high temperature or the calcination of alum

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  • Method for extracting aluminum oxide from fly ash based on ammonium sulfate activation process
  • Method for extracting aluminum oxide from fly ash based on ammonium sulfate activation process
  • Method for extracting aluminum oxide from fly ash based on ammonium sulfate activation process

Examples

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Effect test

Embodiment 1

[0062] (1) Fly ash and ammonium sulfate (NH 4 ) 2 SO 4 Mixing granulation, see figure 1

[0063] 2130Kg fly ash (containing Al 2 o 3 48.2%) and 2640Kg (NH 4 ) 2 SO 4 (the molar ratio is 1:2), mix evenly, grind to reach the specified particle size (20 micron particles account for 80%), add 600Kg of water, adopt industrial drum or drum granulator to uniformly granulate, and mix the particles with spherical shape The particle size is 5mm in diameter, and more than 80% of the qualified particles are qualified. Obtain 5360Kg of granulated finished product.

[0064] (2) Roast the particles in a two-stage fluidized roasting system, see figure 2

[0065] The granulated finished product enters the low-temperature fluidized roasting system through the silo and special material feeding device, and undergoes low-temperature roasting to remove all the moisture on the surface of the granules.

[0066] The dehydrated powder coming out of the low-temperature roasting fluidized be...

Embodiment 2

[0074] (1) Fly ash and ammonium sulfate (NH 4 ) 2 SO 4 Mixing granulation, see figure 1

[0075] 2130Kg fly ash (containing Al 2 o 3 48.2%) and 6600Kg (NH 4 ) 2 SO 4 (the molar ratio is 1:5), mix evenly, grind to reach the specified particle size (20 micron particles account for 80%), add 1500Kg of water, use industrial drum or drum granulator to uniformly granulate, and mix the particles with spherical shape The particle size is 3mm in diameter, and more than 80% of the qualified particles are qualified. Obtain granulated finished product 10210Kg.

[0076] (2) Roast the particles in a two-stage fluidized roasting system, see figure 2

[0077] The granulated finished product enters the low-temperature fluidized roasting system through the silo and special material feeding device, and undergoes low-temperature roasting to remove all the moisture on the surface of the granules.

[0078] The dehydrated powder coming out of the low-temperature roasting fluidized bed ...

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Abstract

The invention relates to a method for extracting aluminum oxide from fly ash based on an ammonium sulfate activation process. By adopting roasting of the fly ash and ammonium sulfate, combined impurity removal and a two-section fluidized roasting system, the problem of high corrosion of equipment in the background technology is solved; a process chain of a main flow is shortened; through the roasting system, the roasting process is low in energy consumption, economic and low in cost by using methods such as two-section cyclic fluidized roasting and dense phase transportation; and the technical problem of material melting, wall sticking, caking or ring forming is solved.

Description

technical field [0001] The invention relates to a method for extracting alumina from fly ash based on an ammonium sulfate activation process. Background technique [0002] Thermal power generation occupies a dominant position in my country's power generation structure, and coal-fired thermal power generation occupies an absolute proportion in thermal power generation. Fly ash is a solid waste discharged from coal-fired power plants. [0003] In recent years, with the development of the power industry, the emission of fly ash has increased sharply. According to the report of China Coal Industry Association in January 2009, the total coal production in my country in 2008 was 2.716 billion tons, most of which were used for power generation , the annual discharge of fly ash in my country has exceeded 200 million tons, and the cumulative stockpiles have exceeded 2.5 billion tons, occupying a large amount of arable land and polluting the environment on a large scale. Therefore, ca...

Claims

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Application Information

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IPC IPC(8): C01F7/02
Inventor 郭新锋曾伟钱永康郭坤丁建亮高璇梁兴国杨超
Owner CHINA SHENHUA ENERGY CO LTD
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