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

Purification method of silicon dioxide

A technology of silicon dioxide and purification method, applied in the direction of silicon dioxide, silicon oxide, etc., can solve the problems of residual impurities and insufficient purification effect, and achieve the effect of good purification effect.

Inactive Publication Date: 2020-10-09
福建通源硅业有限公司
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a method for purifying silica, which has the advantage of better purification effect, and solves the problem that the existing silica preparation method does not have a good purification effect, and some impurities will remain in the In the purified silica, these impurities need to be further reduced

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for purifying silicon dioxide, comprising the steps of:

[0020] 1) Material preparation stage: the raw material silica powder is obtained from quartz rock by ball milling, put the silica powder into a container for standby, particle size: 100-110 mesh, hydrofluoric acid, oxalic acid and concentrated nitric acid are respectively pressed The proportions were dissolved in the corresponding water, and manually stirred for 2 minutes to prepare a hydrofluoric acid solution with a concentration of 2%, a solution of oxalic acid with a concentration of 3%, and a concentrated nitric acid solution with a concentration of 30% for later use;

[0021] 2) Acid leaching to remove impurities: Mix 2% hydrofluoric acid solution, 3% oxalic acid solution, 30% concentrated nitric acid solution with silica powder, among which 2% hydrofluoric acid solution The mixed solution of acid solution, oxalic acid solution with a concentration of 3% and concentrated nitric acid solution with a...

Embodiment 2

[0027] A method for purifying silicon dioxide, comprising the steps of:

[0028] 1) Material preparation stage: the raw material silica powder is obtained from quartz rock after ball milling, put the silica powder into a container for standby, particle size: 110 mesh-120 mesh, hydrofluoric acid, oxalic acid, and concentrated nitric acid are respectively pressed The proportions were dissolved in the corresponding water, and manually stirred for 2 minutes to prepare a hydrofluoric acid solution with a concentration of 2%, a solution of oxalic acid with a concentration of 3%, and a concentrated nitric acid solution with a concentration of 30% for later use;

[0029] 2) Acid leaching to remove impurities: Mix 2% hydrofluoric acid solution, 3% oxalic acid solution, 30% concentrated nitric acid solution with silica powder, among which 2% hydrofluoric acid solution The mixed solution of acid solution, oxalic acid solution with a concentration of 3% and concentrated nitric acid soluti...

experiment example

[0036] When the liquid-solid ratio is 4:1, the removal rate of impurities is the highest. In actual experiments, the liquid-solid ratio should be at least 1:1 to ensure that the viscosity and friction loss of the mixed solution will not be too large, which will increase the operating cost.

[0037] It can be seen by comparing the surface of silica particles before and after acid leaching with a high-power scanning electron microscope. The acid leaching treatment can remove most of the impurities and debris on the surface of the silica particles, and hydrofluoric acid will etch the silica to form pores of different sizes. It makes it easier for the acid liquid to enter the interior of the particles and remove the impurity inclusions. This method can make the removal rates of iron, aluminum, calcium and phosphorus impurities reach 99.99%, 14.02%, 73.27% and 60.00% respectively. The total amount of impurities after acid leaching The decline is obvious.

[0038] The beneficial eff...

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

PropertyMeasurementUnit
particle size (mesh)aaaaaaaaaa
Login to View More

Abstract

The invention relates to the technical field of silicon dioxide, and discloses a silicon dioxide purification method which comprises the following steps: 1) a material preparation stage; and 2) acid leaching and impurity removal. According to the method, a mixed solution of a hydrofluoric acid solution with the concentration of 2%, an oxalic acid solution with the concentration of 3% and a concentrated nitric acid solution with the concentration of 30% is named as a mixed solution; the liquid-solid ratio of the mixed solution to silicon dioxide powder is 4:1; then a stirrer is used for stirring, a leaching reaction is performed under the condition that the acid leaching time is set to be 4h, the acid leaching temperature is 30 DEG C and the stirring rotating speed is 150r / min, then, an impurity removal solution after the reaction is obtained, and is subjected to suction filtration and washing, and drying is performed in a constant-temperature drying oven having a temperature of 80 DEGC to obtain purified silicon dioxide. The purification method greatly reduces the impurities of iron, aluminum, calcium and phosphorus in the silicon dioxide, achieves the purpose of better purification effect, and is simple in process, mild in condition and suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of silicon dioxide, in particular to a method for purifying silicon dioxide. Background technique [0002] Silica is used in the manufacture of flat glass, glass products, foundry sand, glass fiber, ceramic glaze, sandblasting for anti-rust, sand for filtration, flux, refractory materials, and the manufacture of lightweight air cell concrete. Silica is widely used , relatively rare crystals in nature can be used to manufacture important components of the electronics industry, optical instruments and handicrafts. [0003] Existing silicon dioxide preparation methods, such as a method for purifying silicon dioxide disclosed in Chinese invention CN 103435049 A, have a simple process and mild conditions, and can remove lithium, sodium, potassium, aluminum and titanium in silicon dioxide. and other impurity elements, but in the actual use process, the purification effect of the existing silica preparation method...

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
Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/18
CPCC01B33/18C01P2006/80
Inventor 许荣明
Owner 福建通源硅业有限公司