Method for producing water class with high mole ratio by coal gangue acid-leaching residue

A high modulus water glass, acid leaching slag technology, applied in the removal of silicate, alkali metal silicate, solid waste, etc., can solve the problems such as no public reports of high modulus water glass, and achieve production efficiency High and good filtration performance, ensuring the effect of silicon yield

Active Publication Date: 2012-02-08
KUNMING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] After literature search, there is no public report on the direct prod

Method used

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  • Method for producing water class with high mole ratio by coal gangue acid-leaching residue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1: Take Al 2 o 3 , SiO 2 Acid slag with a mass content of 3.67% and 81.32% was used as raw material.

[0033] 1. The first alkali solution

[0034]Set the alkali solution reaction to water glass modulus of 2, take 2000g of acid residue in a 10000ml three-necked flask, add 2168g of alkali and 3832g of water to make a solution with a liquid-solid ratio of 3:1, and put the three-necked flask into a water bath Inside, control the temperature in the three-necked flask to 95°C, react under normal pressure for 1h, filter while hot, replace with 1000ml of water, incorporate into the filtrate, and wash the filter cake three times with 9000ml of water. The first lotion is used for the next alkali preparation, the second lotion is used for the insufficient part, and the rest is used for the next alkali solution washing. Obtain filtrate 5210ml, weight is 6148g, is 2.41 after analyzing filtrate water glass modulus, SiO 2 The content is 1351g, and the dissolution rate ...

Embodiment 2

[0042] Example 2 : Take Al 2 o 3 , SiO 2 Acid slag with a mass content of 6.0% and 83.7% was used as raw material.

[0043] 1. The first alkali solution

[0044] Set the alkali-dissolving reaction to water glass modulus of 2, take 2000g of acid slag in a 10000ml three-necked flask, add 2232g of alkali and 4768g of water to make a solution with a liquid-solid ratio of 3.5:1, and put the three-necked flask into a water bath Inside, control the temperature in the three-necked flask to 92°C, react for 1.5h, filter while hot, replace with 1000ml of water, incorporate into the filtrate, and wash with 9000ml of water three times. The first lotion is used for the next alkali preparation, the second lotion is used for the insufficient part, and the rest is used for the next alkali solution washing. Obtain filtrate 6310ml, weight is 7005g, is 2.12 through analysis filtrate water glass modulus, SiO 2 The content is 1410g, and the dissolution rate of silicon is 84.2%.

[0045] 2. ...

Embodiment 3

[0052] Example 3 : Take Al 2 o 3 , SiO 2 Acid slag with a mass content of 7.8% and 75% was used as raw material.

[0053] 1. The first alkali solution

[0054] Set the alkali solution reaction to water glass modulus of 2, take 2000g of acid residue in a 10000ml three-necked flask, add 2000g of alkali and 6000g of water to make a solution with a liquid-solid ratio of 4:1, and put the three-necked flask into a water bath Inside, control the temperature in the three-necked flask to 90°C, react for 2.0 hours, filter while hot, replace with 1000ml of water, incorporate into the filtrate, and wash with 9000ml of water three times. The first lotion is used for the next alkali preparation, the second lotion is used for the insufficient part, and the rest of the lotion is used for the next alkali solution washing. Obtain filtrate 7750ml, weight is 8835g, is 2.20 through analysis filtrate water glass modulus, SiO 2 The content is 1278g, and the dissolution rate of silicon is 85.2...

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Abstract

The invention relates to a method for producing water class with a high mole ratio by coal gangue acid-leaching residues, and belongs to the technical field of resource utilization of coal-series solid wastes. Coal gangue acid-leaching residues with not more than 8% of Al2O3 and not less than 75% of SiO2 are adopted as raw materials, and the method comprises the following steps: preparing caustic soda according to the molar ratio of SiO2 in the acid residues, adding water to adjust the liquid solid ratio of the reaction, performing an alkali dissolution reaction at a temperature of 90-95 DEG C and a normal pressure, after the reaction is finished, filtering when the solution is hot so as to obtain water class with a low mole ratio, adding coal gangue acid-leaching residues into the water class with a low mole ratio, performing a mole-increasing reaction under a same operation condition, after the reaction is finished, filtering when the solution is hot so as to obtain water class with a high mole ratio. In the method, the water glass produced during alkali dissolution has a low mole ratio, which ensures a high dissolution rate of silicon during alkali dissolution and good filtration and washing performance of the filter cake; the increase of the mole ratio of the water glass from alkali dissolution is realized by continuing adding acid residues; after the mole-increasing reaction, acid residues are filtered and directly returned for alkali dissolution without the need of washing. The invention has a mild reaction condition, a simple process, and convenient operations, does not involve high-temperature high-pressure equipment, and also solves the problem of low mole ratio of water glass prepared by coal gangue.

Description

technical field [0001] The invention relates to a method for producing high-modulus water glass by utilizing coal gangue acid leaching residue, and belongs to the technical field of resource utilization of coal series solid waste. Background technique [0002] my country is a developing country that uses coal as the main energy source. Coal accounts for more than 70% of primary energy consumption. Coal gangue is solid waste discharged during the coal mining process and coal washing process. An associated black-gray rock with low carbon content and harder than coal. Its main component is Al 2 o 3 , SiO 2 , also contains varying amounts of Fe 2 o 3 , CaO, MgO, Na 2 O, K 2 O.P 2 o 5 , SO 3 and trace elements. Its emission is equivalent to about 10% of the coal output of the year. At present, 4.5 billion tons have been accumulated and it covers an area of ​​about 120,000 hectares. It is currently one of the largest industrial and mining solid wastes in my country. Coa...

Claims

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Application Information

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IPC IPC(8): C01B33/32B09B3/00
Inventor 夏举佩张召述秦岭谷立轩
Owner KUNMING UNIV OF SCI & TECH
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