Novel process for purifying and washing ultra-fine silicon dioxide by employing membrane separation technology

A technology of ultra-fine silica and solid-liquid separation, applied in the direction of inorganic chemistry, silicon compounds, chemical instruments and methods, etc., can solve the problems of high labor intensity, many repetitions, long cycle, etc., and achieve good effect and anti-pollution Strong, long-lasting effect

Inactive Publication Date: 2008-07-23
HUNAN JINMA NEW MATERIAL TECH CO LTD
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  • Application Information

AI Technical Summary

Problems solved by technology

Due to the small particle size of ultra-fine silica, it is easy to suspend in the solution and mix with ionic impurities. The traditional plate and frame filter press method and centrifugal separation method have long cycle and repeated problems in solid-liquid separation and sufficient washing of particles. Many times, high labor intensity, low efficiency and poor effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] After the quartz sand is ultra-finely ground, D 50 =2μm, the pulping concentration is 25%, after acid leaching with sulfuric acid, hydrochloric acid and strong reducing agent, pH=3, at this time the solution mainly contains Fe 2+ Plasma impurities, diluted with water, the concentration is 5%, transferred to the circulation tank, under the pressure of less than 1MPa, continuously pass through the inorganic ceramic membrane with a diameter of 0.5μm, made of alumina, with a diameter of Φ41mm, and 19 channels. With the addition of 2 volumes of deionized water, Fe 2+ Plasma impurities are gradually discharged, and the tail liquid is detected to contain Fe by color reaction. 2+ ions, the pH of the solution was tested with a digital pH meter to be 7.0, and the mass percent concentration after concentration was 40%. After drying, the silicon dioxide recovery rate was measured to be 99.5%.

Embodiment 2

[0014] Prepare sodium silicate into a water glass solution, then pickle in 5% sulfuric acid (28-32°C, 8 hours), then heat up to 80°C, stir, adjust the pH value to 5-7, and mature for 20 minutes to obtain Amorphous silica gel, add 4 volumes of H 2 After O is diluted, the concentration is 5%, and it is transferred to the circulation tank. Under the pressure of less than 1 MPa, it continuously passes through the inorganic ceramic membrane with a pore size of 0.01 μm and made of alumina. With the addition of 2 times the volume of deionized water, H + , SO 4 2- Plasma impurities are gradually discharged, and the pH of the solution is tested with a digital pH meter. The pH of the solution is 7.0. After concentration, the mass percentage concentration is 25%. After drying and dispersing, an ultrafine silica powder is obtained with a purity of 99.89%. The average particle size is 0.230 μm.

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PUM

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Abstract

The invention provides a new technology for washing and purifying superfine silicon dioxide with an applied membrane separation technology, and discloses a new method for the efficient washing and purification and the solid-liquid separation and concentration of the superfine silicon dioxide powder, which effectively improves the phenomena of long washing cycle, low efficiency and poor product quality of traditional washing methods like a plate and frame filter press and a centrifuge. The superfine substance separation technology is based on the membrane filtering effect of a porous ceramics medium, and adopts an efficient 'cross flow' filtering type, which leads the superfine silicon dioxide powder suspending liquid to be treated with sufficient washing, solid-liquid separation and realize the purification purpose of the powder. The method is an ideal method for the moment for efficiently washing and purifying the superfine silicon dioxide powder.

Description

technical field [0001] The design of the invention relates to a new method for high-efficiency washing and purification and solid-liquid separation and concentration of ultrafine silica powder. Background technique [0002] Ultrafine silica powder refers to micron, submicron, and nanoscale silica with a particle size of less than 0.1mm. The application fields of ultra-fine silica are (1) used in adhesives, sealants, glass fiber reinforced plastics and silicone rubber with reinforcing, thickening and thixotropic properties; (2) used in coatings and inks as matting agents and enhancers Thickener; (3) Applied in the food industry, it can absorb and desorb the ingredients in food processing, so that the ingredients can be evenly mixed into the food, and keep the natural nutrients. It is mainly used as an adsorbent and thickener for food ingredients. And gelling agent, food anti-moisture and anti-caking agent, food powder dispersant; (4) When applied to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/037
Inventor 张宇平蔡有兴易琳琪李舟李浩
Owner HUNAN JINMA NEW MATERIAL TECH CO LTD
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