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Method used for preparing flake-like silicon dioxide powder

A silicon dioxide and powder technology, which is applied in the field of preparing flaky silicon dioxide powder, can solve the problems of small average diameter and thickness of flaky powder, insignificant flaky characteristics, and difficulties in large-scale production, and achieve regular crystal morphology, Perfect grain development and high powder uniformity

Active Publication Date: 2015-07-29
贵州天合国润高新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional preparation method of flaky silica powder has problems such as expensive raw materials, small average diameter-thickness ratio of flaky powder, insignificant flaky characteristics, complex process, difficulty in large-scale production, and high manufacturing cost.

Method used

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  • Method used for preparing flake-like silicon dioxide powder
  • Method used for preparing flake-like silicon dioxide powder
  • Method used for preparing flake-like silicon dioxide powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: with NH 4 NO 3 , phosphorus pentachloride and aluminum difluoride as additives to prepare flaky silica powder

[0027] with SiO 2 The bauxite ore is used as a raw material, and the bauxite ore is dried at 300 ° C for 1 hour, and the bauxite ore is crushed into a powder with a particle size of 0.1mm, and 0.05wt.% NH is added to the bauxite ore powder 4 NO 3 , 1wt.% phosphorus pentachloride and 6wt.% aluminum difluoride are uniformly mixed by means of stirring or ball milling to obtain a mixed powder. The mixed powder is packed in an airtight container, and the volume of the mixed powder accounts for 40% of the volume of the airtight container. The calcination is carried out in an atmosphere containing halogen, the calcination temperature is 600° C., the atmosphere pressure is 0.1 MPa, and the calcination time is 2 hours. During the calcination process, the formed silicon halide is hydrolyzed to obtain silicon dioxide and hydrogen halide. The atmosphere c...

Embodiment 2

[0028] Embodiment 2: Preparation of flaky silica powder with ammonium sulfate, phosphorus trifluoride and ferric fluoride as additives

[0029] with SiO 2 The zircon sand is used as a raw material, and the zircon sand is dried at 400°C for 2 hours, and the zircon sand is broken into a powder with a particle size of 0.3mm, and 0.08wt.% ammonium sulfate, 0.8wt.% ammonium sulfate and 0.8wt. % phosphorus trifluoride and 5wt.% ferric fluoride are uniformly mixed by means of stirring or ball milling to obtain a mixed powder. The mixed powder is packed in an airtight container, and the volume of the mixed powder accounts for 50% of the volume of the airtight container. The calcination is carried out in an atmosphere containing halogen, the calcination temperature is 1100° C., the atmospheric pressure is 0.2 MPa, and the calcination time is 6 hours. During the calcination process, the formed silicon halide is hydrolyzed to obtain silicon dioxide and hydrogen halide. The atmosphere ...

Embodiment 3

[0030] Example 3: Preparation of flaky silica powder with ammonium carbonate, phosphorus tribromide and niobium fluoride as additives

[0031] with SiO 2 The fly ash is used as raw material, and the fly ash is dried at 500°C for 3 hours, and the fly ash is broken into a powder with a particle size of 0.5mm. Add 0.06wt.% ammonium carbonate, 0.5wt.% Phosphorus tribromide and 4.5wt.% niobium fluoride are uniformly mixed by means of stirring or ball milling to obtain a mixed powder. The mixed powder is packed in an airtight container, and the volume of the mixed powder accounts for 60% of the volume of the airtight container. The calcination is carried out in an atmosphere containing halogen, the calcination temperature is 1200° C., the atmospheric pressure is 0.4 MPa, and the calcination time is 5 hours. During the calcination process, the formed silicon halide is hydrolyzed to obtain silicon dioxide and hydrogen halide. The atmosphere containing hydrogen halide is a mixed gas...

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Abstract

The invention provides a method used for preparing flake-like silicon dioxide powder, and belongs to the technical field of powder particle size and morphology control. According to the method, bauxitic clay ore powder containing SiO2 is taken as a raw material; an activator, a dispersant, and a crystal grain morphology control agent are added into the raw material for uniform mixing; an obtained mixed powder is subjected to calcining in atmosphere containing halogen, and obtained silicon halide is subjected to hydrolysis so as to obtain silicon dioxide and halogen hydride; after calcining, the valve of a sealed reaction container is unsealed, so that high pressure gas in the sealed reaction container is delivered into a gas-solid separator with a larger volumn via expansion so as to realize gas-solid separation of silicon halide with gas phase and obtain the flake-like silicon dioxide powder, wherein the gas-solid separator is provided with a water cooling jacket. Thickness of the flake-like silicon dioxide powder is less than 0.2 <mu>m, and average diameter-to-thickness ratio is higher than 50. Reaction temperature of the method is relatively low; the method is simple; energy consumption is low; production cost is low; and the diameter-to-thickness ratio of the flake-like silicon dioxide powder can be adjusted.

Description

technical field [0001] The invention belongs to the technical field of powder preparation and powder shape control, and particularly provides a method for preparing flaky silicon dioxide powder. Background technique [0002] At present, flaky silica is a kind of silica with a two-dimensional planar structure, its radial scale is micron scale, and its thickness scale is nanoscale or submicron scale. The functions that it does not have, showing strong dispersion, adhesion, significant shielding effect and ability to reflect light, have broad applications in the fields of industry, cosmetic raw materials, coating films, pearlescent pigments, biomedical and composite material reinforcement. Application prospect. In the industrial field, taking advantage of the transparent and low hygroscopicity of flaky silica and its good adhesion to the substrate, it is used as a filler for materials, and it also has a thickening effect when added to water-soluble polymers. In the field of p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/18
Inventor 章林
Owner 贵州天合国润高新材料科技有限公司
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