Production method for polysilicic acid

A production method, polysilicic acid technology, applied in chemical instruments and methods, silicon compounds, inorganic chemistry, etc., can solve the problems of high specific consumption of regenerant, high cost of wastewater treatment, and large amount of wastewater discharge, so as to ensure effective control, The effect of reducing wastewater treatment costs

Active Publication Date: 2013-04-17
SHANGHAI XINANNA ELECTRONICS TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] In view of the above-mentioned shortcoming of the prior art, the purpose of the present invention is to provide a kind of polysilicic acid production method, be used to solve the deionized water consumption in the prior art, the specific consumption of regeneration agent is large, the water glass utilization rate is low, waste water The problems of high discharge, high cost of wastewater treatment and high content of residual metal elements in polysilicate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Preparing cycle cycles (column preparation)

[0037] 1) Add R-H strong acid resin (001×7 resin) to a DN50 exchange column to a height of 1.5m (called exchange column A); add R-H acrylic resin to a DN50 exchange column to a height of 1.0m (called exchange column B). The resin exchange capacity of the two exchange columns is ≈15 moles, and the volume of the resin layer is ≈5 L (R-H).

[0038] 2) Take the modulus as 3.4, SiO 2 The content is 6g / 100ml dilute water glass solution 35L (1.37 times the total amount of resin exchange), sequentially flow countercurrently through the exchange column B, and then flow through the exchange column A to obtain 19L polysilicic acid a and 15.6L alkaline recovery solution b (of which Residual resin layer 0.4L, the following conditions are the same), at this time the volume of the resin layer becomes ≈6L.

[0039] 3) Use 6L (equivalent to 1.0 times the volume of the resin layer) of deionized water to spray and rinse the exchange column B...

Embodiment 2

[0050] Preparing cycle cycles (column preparation)

[0051] 1) Add R-H strong acid resin (001×7 resin) to a DN50 exchange column to a height of 1.5m (called exchange column A); add R-H acrylic resin to a DN50 exchange column to a height of 1.0m (called exchange column B). The resin exchange capacity of the two exchange columns is ≈5 moles, and the volume of the resin layer is ≈5L (R-H).

[0052] 2) Take the modulus as 3.4, SiO 2 35L of dilute water glass solution with a content of 6g / 100ml (1.37 times the resin exchange capacity), flowed countercurrently through the exchange column B and flow through the exchange column A, respectively, to obtain 7L polysilicic acid a (part of metal element <1ppm) and 27.6L Alkaline recovery solution b, at this time the volume of the resin layer becomes ≈6L.

[0053] 3) Spray and rinse exchange column B and exchange column A with 6L deionized water in sequence to obtain 6L rinse solution c, which is used as deionized water to dilute concentr...

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PUM

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Abstract

The invention provides a production method for polysilicic acid. The method comprises the following steps: using excessive water glass to improve the resin exchange efficiency through the cation exchange; reducing the regenerant specific consumption and improving the finished product purity through collocation of weak acid type cation exchange resin and strong acid type cation exchange resin; backwards flowing the water glass to guarantee the flow smoothness through the weak acid type cation exchange resin; using exchanged flushing liquid to dilute concentrated water glass in order to improve the utilization rate of the water glass and reduce the waste water emission; and using collected acid residual liquid and generated flushing liquid for the next cycle of resin regeneration in order to further reduce the consumption of acid for regeneration and reduce the waste water neutralization cost. The method has the advantages of low regenerant specific consumption, high finished product purity, low consumption of de-ionized water and low waste water treatment cost, and has very remarkable commercial value.

Description

technical field [0001] The invention belongs to the field of production of inorganic fine chemicals, in particular to a method for producing polysilicic acid as a raw material for the manufacture of silica sol (including silicon dioxide abrasives for semiconductor crystal gardens and other chemical mechanical polishing), more precisely It is a method to save the amount of deionized water, reduce the amount of regenerant, improve the utilization rate of water glass, and control the content of polysilicate metal elements. Background technique [0002] There are many production methods currently used to manufacture silica sol, including water glass ion exchange method, water glass electrodialysis method, water glass acid direct neutralization method, silica gel high temperature dissolution method, elemental silicon dissolution method and organosilicon hydrolysis method, However, commercialization uses a large number of water glass ion exchange methods, silica gel high-temperatu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/143
Inventor 潘忠才张正陆莉鹰
Owner SHANGHAI XINANNA ELECTRONICS TECH
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