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Method for preparing laminated crystalline sodium disilicate by alta-mud

A technology of sodium disilicate and layered crystallization, applied in the direction of silicate, alkali metal silicate, etc., can solve the problems of limited product promotion and application, difficult operation, high production cost, etc., to overcome the high cost of raw material consumption , short process flow and low production cost

Inactive Publication Date: 2005-05-11
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Comprehensive analysis existing method, no matter above-mentioned which kind of method still adopts the method that solid phase or liquid water glass are commonly used to prepare layered crystalline sodium disilicate, its production cost is all higher, has limited the popularization and application of product; In addition, If quartz sand and caustic soda are used to prepare layered crystalline sodium disilicate, it is necessary to leach SiO under pressure of 0.8-1.0Pa and high temperature. 2 , the process is complicated and the operation is difficult

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Use 500g of bentonite produced in Xuanhua, Hebei Province as raw material, SiO 2 Content 57.12%, Al 2 o 3 Content 13.46%, Fe 2 o 3 Content 4.88%, free water 8%. Disperse bentonite with tap water in the dispersing tank and cross 100 mesh sieves to separate plant and mineral impurities, adjust bentonite: water=1: 4, add decomposition aid 10g in the mortar under stirring, After decomposing for 30 minutes, add 200ml of 93% concentrated sulfuric acid dropwise, raise the temperature to 90°C after adding, leaching for 2 hours under constant temperature conditions, filter while hot, wash the filter residue with water until the pH value is 4-5, and discharge it, that is, the active silicon residue is ready for use . The filtrate is used for papermaking black liquor treatment. Add 1500g of water into a leaching flask with an effective volume of 3000ml, and then add active silicon slag under stirring. Slowly add caustic soda into the leaching flask to dissolve with a modulus ...

Embodiment 2

[0034] Use 500g of Hebei Hanxing third-line bentonite as raw material, SiO 2 Content 48.6%, Al 2 o 3Content 13.06%, Fe 2 o 3 Content 5.92%, free water 8.9%. Use tap water to disperse bentonite in a dispersion tank and pass through a 100-mesh sieve to separate plant and mineral impurities, adjust bentonite: water = 1:5, add 8g of decomposition aid to the mortar under stirring, decompose for 40min, then add concentrated sulfuric acid dropwise 40ml, after adding, raise the temperature to 90°C, leaching for 2 hours under constant temperature conditions, filter while hot, wash the filter residue with water until the pH value is 4-5, and discharge it, that is, active silicon residue for later use. The filtrate is used for papermaking black liquor treatment. Add 1500g of water into a leaching flask with an effective volume of 3000ml, and then add active silicon slag under stirring. With the modulus as 2, calculate the amount of caustic soda and slowly add it to the leaching flas...

Embodiment 3

[0036] Make raw material with the bentonite of 300g Leping, Jiangxi Province, SiO 2 Content 68.26%, Al 2 o 3 Content 12.31%, Fe 2 o 3 Content 2.32%, free water 6.7%. Use tap water to disperse bentonite in a dispersion tank and pass through a 100-mesh sieve to separate plant and mineral impurities, adjust bentonite: water = 1:5, add 12g of decomposition aid to the mortar under stirring, decompose for 30min, then add concentrated sulfuric acid dropwise After adding 35ml, raise the temperature to 90°C, leaching for 2 hours at a constant temperature, filter while it is hot, wash the filter residue with water until the pH value is 4-5, and discharge it, that is, active silicon residue for later use. The filtrate is used for papermaking black liquor treatment. Add 1500g of water into a leaching flask with an effective volume of 3000ml, and then add active silicon slag under stirring. The modulus is 2, calculate the amount of caustic soda and slowly add it to the leaching flask ...

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PUM

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Abstract

A production of lamellar crystalline sodium disilicate from bentonite is disclosed. It is carried out by activating SiO2 by decomposing assistants, leaching out metal ions in raw material by inorganic acid, adding industrial NaOH into material pulp with bentonite: water=100: 400 by mol ratio SiO2: Na2O=2:1, reacting at temperature 100deg.C for 1-2 hrs, filtrating, concentrating, methanol devitrifying, drying and thermal treating to convert crystalline form at 400-790deg.C. Its advantages include simple process, low cost and high utilization.

Description

technical field [0001] The invention relates to a method for preparing layered sodium silicate (layered crystalline sodium disilicate) by using bentonite, and belongs to the technical field of preparation of washing aids in inorganic chemistry. Background technique [0002] In the technical field of inorganic chemistry, sodium tripolyphosphate (STPP) is recognized as an excellent detergent builder due to its good compatibility with other components of laundry detergent. However, with the rapid growth of detergent production, large-scale use of STPP has resulted in greater pollution to the environment, and it is considered to be the most important source of pollution for water eutrophication, so some developed countries in the world have adopted a comprehensive ban on the use of STPP. STPP measures, and successively found out the detergent builder materials to replace STPP, the more commonly used are 4A zeolite, sodium metasilicate, layered crystalline sod...

Claims

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Application Information

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IPC IPC(8): C01B33/32
Inventor 杨久义刘艳春张士莹
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY