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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. Good, guarantee the yield of silicon, guarantee the effect of washing effect

Inactive Publication Date: 2014-07-30
KUNMING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] After literature search, there is no public report on the direct production of high modulus water glass by using coal gangue acid leaching residue

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 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. Choose coal gangue acid leaching residue containing Al2O3≤8%, SiO2≥75% as raw material, mix caustic soda according to the molar amount of SiO2 in the acid residue, add water to adjust the reaction liquid-solid ratio, and carry out the reaction at 90-95°C and normal pressure. Alkali dissolution reaction, after the reaction is completed, filter while it is hot to obtain low modulus water glass, add coal gangue acid leaching residue to the low modulus water glass, and carry out mold lifting reaction under the same operating conditions, after the reaction is completed, filter while it is hot , to obtain high modulus water glass. The modulus of the water glass produced during the alkali dissolution of the method is low, which ensures the high dissolution rate of silicon and the good filtration and washing performance of the filter cake during the alkali dissolution. The improvement of the alkali soluble water glass modulus is realized by continuously adding acid slag. The acid slag after the mold is filtered and returned directly to the alkali solution without washing. The invention has mild reaction conditions, simple process, convenient operation, does not involve high temperature and high pressure equipment, and simultaneously solves the problem of low modulus of water glass prepared from 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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Patent Type & Authority Patents(China)
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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