Unlock instant, AI-driven research and patent intelligence for your innovation.

Method of producing electronic grade fluoride salt from fluorosilicic acid and fluorosilicate

A technology using fluorosilicic acid and fluorosilicate, which is applied in the shape preparation of alkali metal fluorides and alkali metal halides, and can solve the problems of consumption of strategic resources fluorite, high cost of hydrofluoric acid, and consumption of potassium resources. , to achieve good social benefits, reduce the cost of raw materials, and improve the efficiency of production enterprises

Pending Publication Date: 2019-12-20
徐小岗
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The usual method of international and domestic production of electronic grade potassium fluoride is to neutralize potassium hydroxide or potassium carbonate with hydrofluoric acid. Hydrofluoric acid is mainly produced by the reaction of fluorite and sulfuric acid. The original process needs to consume valuable strategic The resource fluorite, the cost of hydrofluoric acid is also quite high, and it also consumes a lot of potassium resources

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method of producing electronic grade fluoride salt from fluorosilicic acid and fluorosilicate
  • Method of producing electronic grade fluoride salt from fluorosilicic acid and fluorosilicate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment I

[0049] 1. The potassium fluoride liquid after alkali hydrolysis of fluosilicic acid, potassium fluosilicate and potassium hydroxide was settled for 48 hours, cooled to a temperature of 20-25 degrees, and the supernatant was filtered by a 0.5 μm PE microfiltration method under low pressure ; Preliminary separation of solids such as silicon dioxide;

[0050] 2. The potassium fluoride liquid with a concentration of about 25% separated above is passed through a plate-type concentration method, and the concentration of the hot potassium fluoride liquid is increased to a concentration of more than 50%, and the temperature of the potassium fluoride liquid is maintained at above 50 degrees. The device is shown in the figure represented by;

[0051] 3. The above-mentioned hot potassium fluoride liquid with a concentration of more than 50% is subjected to high-temperature recrystallization, and the temperature of the liquid is kept at about 60 degrees to obtain transparent regular oval ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for producing an electronic-grade fluoride salt from fluosilicic acid and a fluosilicate. The method comprises the following steps: carrying out alkaline hydrolysis onfluosilicic acid, the fluosilicate and an alkali to obtain a fluoride salt liquid, settling, cooling and filtering; primarily separating an obtained solid; carrying out plate type concentration on the fluoride salt liquid processed through separation to increase the concentration of the hot fluoride salt liquid to 50% or above, and maintaining the temperature to be 50 DEG C or higher; carrying out high-temperature recrystallization on the hot potassium fluoride liquid with the concentration of 50% or hgiher, keeping the temperature of the liquid in a range of 50-55 DEG C to obtain transparent regular oval and square crystals, drying and packaging to obtain the electronic-grade fluoride salt; wherein an obtained mother liquor is used for producing industrial-grade potassium fluoride. Themethod is low in cost, low in investment, free of wastewater discharge, and is safe; and potassium fluoride obtained through the method can meet the requirements of 99.99% electronic-grade potassium fluoride enterprises.

Description

technical field [0001] The invention relates to the technical production field of electronic-grade fluoride salt, in particular to a method for producing electronic-grade fluoride salt by using fluorosilicic acid and fluorosilicate. Background technique [0002] The mass fraction of electronic-grade potassium fluoride is greater than 99.99%, oval and square, and large crystal particles of 1-3mm; [0003] Potassium fluoride is widely used in various glass etching, food preservation, electroplating, wood preservatives, welding fluxes, agricultural pesticides and pesticide intermediates, pharmaceutical industry raw materials, and organic fluorinated raw materials, catalysts, absorption Agents, extraction of non-ferrous metals related to semiconductors, aerospace, guided missiles, etc. [0004] Electronic-grade potassium fluoride is mainly used to extract high-purity non-ferrous metal tantalum and niobium, which can improve the high-end performance of semiconductors, and are us...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C01D3/02C01D3/22
CPCC01D3/02C01D3/22C01P2006/80C01P2004/22C01P2004/20
Inventor 徐小岗
Owner 徐小岗