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Filtering refining technology for liquid-state sodium silicate

A liquid sodium silicate, process technology, applied in silicate, alkali metal silicate and other directions, can solve the problems of reducing product purity, short filtration cycle, insufficient filtration accuracy, etc., to improve product purity and quality, improve Filtration volume and filtration speed, the effect of prolonging the filtration cycle

Inactive Publication Date: 2015-12-02
山东龙港硅业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) The filtration accuracy is not enough, and the product contains insoluble silicate small molecule impurities such as iron, aluminum, calcium, magnesium, etc., which reduces the purity of the product and affects the use of downstream customers
[0006] (2) Due to the high concentration and high viscosity of liquid sodium silicate, the filtration speed is slow and the filtration cycle is short, which greatly affects the production capacity and increases the production cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A liquid sodium silicate filtration refining process, the process comprises the following steps:

[0028] (1) At a temperature of 80-95°C, add a flocculant to the crude liquid sodium silicate, stir for 30 minutes under air flow, and let stand for 15 hours to obtain a flocculant;

[0029] (2) At a temperature of 80-95°C, add a filter aid to the flocculant liquid, the amount of the flocculant added is 0.2‰ of the weight of the liquid sodium silicate crude product, and filter through the filter device;

[0030] (3) When filtering, when the pressure difference between the inside and outside of the filter device is greater than 0.2MPa, a booster pump can be installed at the outlet of the filter device to increase the pressure at the outlet of the filtrate, thereby maintaining the inside and outside of the filter device during filtration. The pressure difference is always less than 0.2MPa until the end of filtration to obtain sodium silicate clear liquid and filter residue. ...

Embodiment 2

[0032] A liquid sodium silicate filtration refining process, the process comprises the following steps:

[0033] (1) At a temperature of 80-95°C, add a flocculant to the crude liquid sodium silicate, stir for 40 minutes under air flow, and let stand for 14 hours to obtain a flocculant;

[0034] (2) At a temperature of 80-95°C, add a filter aid to the flocculant liquid, the amount of the flocculant added is 0.5‰ of the weight of the crude liquid sodium silicate, and filter through a filter device;

[0035] (3) When filtering, when the pressure difference between the inside and outside of the filter device is greater than 0.2MPa, a booster pump can be installed at the outlet of the filter device to increase the pressure at the outlet of the filtrate, thereby maintaining the inside and outside of the filter device during filtration. The pressure difference is always less than 0.2MPa until the end of filtration to obtain sodium silicate clear liquid and filter residue.

Embodiment 3

[0037] A liquid sodium silicate filtration refining process, the process comprises the following steps:

[0038] (1) At a temperature of 80-95°C, add a flocculant to the crude liquid sodium silicate, stir for 50 minutes under air flow, and let stand for 13 hours to obtain a flocculant;

[0039] (2) At a temperature of 80-95°C, add a filter aid to the flocculation solution. The amount of the flocculant added is 0.7‰ of the weight of the crude liquid sodium silicate. When adding a filter aid to the flocculation solution, first part of the filter aid The filter agent is pre-coated on the surface of the flocculant, and after 10 minutes, the remaining filter aid is mixed with the flocculant, and filtered through a filter device;

[0040] (3) When filtering, when the pressure difference between the inside and outside of the filter device is greater than 0.2MPa, a booster pump can be installed at the outlet of the filter device to increase the pressure at the outlet of the filtrate, ...

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PUM

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Abstract

The invention belongs to the technical field of sodium silicate production, and particularly relates to a filtering refining technology for liquid-state sodium silicate. The technology comprises the following steps that 1, a flocculating agent is added in crude liquid-state sodium silicate at 80-95 DEG C, then the mixture is stirred for 30-60 minutes and stood for 10-15 hours, and flocculation liquid is obtained; 2, filtering aid is added in the flocculation liquid, and filtering is performed with a filtering device; 3, during filtering, when the internal and external pressure difference of the filtering device is larger than 0.2 MPa, the pressure at a filtering liquid outlet is increased, the internal and external pressure difference of the filtering device is maintained to be smaller than 0.2 MPa during filtering until filtering is finished, and then clear sodium silicate liquid and filter residues are obtained. According to the filtering refining technology for the liquid-state sodium silicate, the product purity and quality are improved, the filtering amount and filtering speed are effectively increased, the filtering cycle is prolonged, the production efficiency is improved to the utmost extent, the manufacturing cost is lowered, and benefits are brought to enterprises.

Description

technical field [0001] The invention belongs to the technical field of sodium silicate production, in particular to a process for filtering and refining liquid sodium silicate. Background technique [0002] Sodium silicate is the most widely developed product among inorganic silicon compounds. As a basic inorganic chemical raw material, it is used to produce various silicate products such as white carbon black, zeolite molecular sieve, silica gel, silica sol, sodium metasilicate, etc.; In the light industry, it is an indispensable raw material for detergents such as washing powder and soap, and it is also a water softener and sedimentation aid; it is used in dyeing, bleaching and sizing in the textile industry; it is widely used in casting and grinding wheels in the machinery industry Manufacturing and metal preservatives, etc.; used in the construction industry to manufacture quick-drying cement, acid-resistant cement, waterproof oil, soil curing agent, refractory materials...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/32
Inventor 王敬伟赵贝贝聂梓新
Owner 山东龙港硅业科技有限公司
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