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Method for preparing clean coal, ammonium fluorosilicate byproduct and sodium metaaluminate product from coal gangue

A technology of ammonium fluorosilicate and sodium metaaluminate, applied in the preparation of alkali metal aluminate/alumina/aluminum hydroxide, the petroleum industry, silicon halide compounds, etc., can solve problems such as ecological damage and environmental pollution, and achieve Effects of reduced reaction energy consumption, shortened process flow, and shortened reaction time

Inactive Publication Date: 2015-07-22
GUIZHOU YUANSHENG POTASSIUM TECH
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] The present invention aims to provide a method of using coal gangue to prepare ammonium fluorosilicate and sodium metaaluminate by-products of clean coal, so as to solve the serious environmental pollution and ecological damage caused by the massive accumulation of coal gangue. This method Using microwave technology to distribute and extract silicon, iron, aluminum, and carbon elements to achieve comprehensive utilization. Compared with other high-temperature methods, it has more prospects for industrialization.

Method used

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  • Method for preparing clean coal, ammonium fluorosilicate byproduct and sodium metaaluminate product from coal gangue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Crush the coal gangue to 80 mesh and the additive fluosilicic acid with a concentration of 15% according to the mass volume of 1t: 1.5m 3 The ratio is mixed, placed in a microwave reactor to control the temperature of the material at 90°C, the microwave power is 2kw, and the microwave frequency is 200MHz for the reaction. The reaction time is 20min. After the reaction, the solid and liquid are separated to obtain the solid a. 50% sulfuric acid is 1t according to mass volume: 0.2m 3 The ratio of microwave acidification reaction is carried out, the acidification temperature is controlled at 150°C, the microwave power is 2kw, the microwave frequency is 300MHz, and the acidification reaction time is 20min to obtain solid b. The gas produced by microwave reaction and microwave acidification passes through the ammoniated absorption tower to obtain fluorine For ammonium silicate products, solid b and sodium hydroxide with a concentration of 10% are 1t:1m according to the mass ...

Embodiment 2

[0022] Crush the coal gangue to 80 mesh and the additive fluosilicic acid with a concentration of 15% according to the mass volume of 1t: 1.5m 3 The ratio is mixed, placed in a microwave reactor to control the temperature of the material at 90 ° C, the microwave power is 5kw, and the microwave frequency is 1000MHz for the reaction. The reaction time is 20 minutes. After the reaction, the solid and liquid are separated to obtain the solid a. 70% sulfuric acid is 1t according to mass volume: 0.7m 3 The ratio of microwave acidification reaction is carried out, the acidification temperature is controlled at 150°C, the microwave power is 5kw, the microwave frequency is 915MHz, the acidification reaction time is 30min, and the solid b is obtained. The gas produced by microwave reaction and microwave acidification passes through the ammoniated absorption tower to obtain fluorine For ammonium silicate product, the solid b and the sodium hydroxide with a concentration of 20% are 1t:4m ...

Embodiment 3

[0024] Crush the coal gangue to 100 mesh and add the auxiliary agent fluosilicic acid with a concentration of 25% according to the mass volume of 1t: 1m 3 The ratio is mixed, placed in a microwave reactor to control the temperature of the material at 100 ° C, the microwave power is 10kw, and the microwave frequency is 2500MHz for the reaction. The reaction time is 30 minutes. After the reaction, the solid and liquid are separated to obtain the solid a. 80% sulfuric acid is 1t according to the mass volume: 0.6m 3 The ratio of microwave acidification reaction is carried out, the acidification temperature is controlled at 200°C, the microwave power is 10kw, the microwave frequency is 2450MHz, the acidification reaction time is 30min, and the solid b is obtained. The gas produced by microwave reaction and microwave acidification passes through the ammoniated absorption tower to obtain fluorine For ammonium silicate product, solid b and sodium hydroxide with a concentration of 25% ...

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Abstract

The invention discloses a method for preparing clean coal, an ammonium fluorosilicate byproduct and a sodium metaaluminate product from coal gangue. The method comprises the following steps: microwave reaction, microwave acidification, ammoniation absorption and neutralization. Compared with domestic existing methods of acid dissolution, high-temperature calcinations and the like, the reaction time is greatly shortened, the reaction energy consumption is greatly reduced, a technological process is shortened, the whole processing process is low-carbon and environment-friendly, and environment-friendly efficient comprehensive development and utilization of the coal gangue is truly realized.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of energy, in particular to a method for preparing ammonium fluorosilicate and sodium metaaluminate by-products of clean coal by using coal gangue. Background technique [0002] my country is the largest coal producing and consuming country in the world. Coal mines emit a large amount of gangue, which is about 15%-20% of the raw coal output of coal mines. It is one of the largest industrial solid wastes in my country at present. It is regarded as "industrial waste" with three hazards of gas, liquid and solid. It accounts for about 1 / 4 of the national industrial waste discharge. At present, the total stock of coal gangue in the country has reached more than 3 billion tons, forming more than 1,500 gangue hills, and the discharge is still increasing year by year. A large amount of coal gangue is discarded, occupying a large area of ​​land. The escape or leaching of sulfide in coal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/04C01B33/10C10L9/02
Inventor 邹锡洪薛希仕任伟陈世毅
Owner GUIZHOU YUANSHENG POTASSIUM TECH
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