Method for preparing silicon dioxide micropowder by using pulverized fuel ash extracted aluminum residue as raw material and silicon dioxide micropowder

A technology for extracting aluminum and silicon dioxide from fly ash, which is applied in the direction of silicon dioxide and silicon oxide, can solve the problems of long production cycle and complicated reaction steps, and achieve the effect of short operation cycle and simple process operation

Active Publication Date: 2014-05-21
CHINA SHENHUA ENERGY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The present invention aims to provide a method for preparing silica micropowder using fly ash aluminum extraction residue as raw material and silica micropowder to solve the complex reaction steps in the prior art when preparing silica from fly ash aluminum extraction residue , the problem of long production cycle

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The aluminum extraction residue from fly ash was ball milled for 5 minutes to make the average particle size reach 3 μm. Sodium hydroxide and fly ash aluminum extraction residue are mixed according to the mass ratio of 0.5:1, placed in a muffle furnace, and calcined at 900°C for 1 hour to obtain a calcined product;

[0036] The above-mentioned calcined product was ball milled for 2 minutes to make the average particle size reach 5 μm. Adding hydrochloric acid with a concentration of 10wt% to the calcined product according to the mass ratio of the calcined product to hydrochloric acid of 1:1, after stirring at a stirring speed of 1000r / min for 5h, filtering to obtain the filtrate;

[0037] The above-mentioned filtrate was washed with water until the pH value was equal to 7, then centrifuged at 4000r / min for 5min, and dried at 70°C for 10h to obtain silica powder.

Embodiment 2

[0039] The aluminum extraction residue from fly ash was ball milled for 15 minutes to make the average particle size reach 0.5 μm. Sodium hydroxide and fly ash aluminum extraction residue are mixed according to the mass ratio of 2:1, placed in a muffle furnace, and calcined at 900°C for 5 hours to obtain a calcined product;

[0040] The above-mentioned calcined product was ball milled for 5 minutes to make the average particle size reach 3 μm. Add hydrochloric acid with a concentration of 30wt% to the calcined product according to the mass ratio of the calcined product to hydrochloric acid of 1:5, and filter after magnetic stirring at a stirring speed of 2000r / min for 2h to obtain a filtrate;

[0041] The above-mentioned filtrate was washed with water until the pH value was equal to 7, then centrifuged at 3000r / min for 15min, and dried at 170°C for 5h to obtain silica powder.

Embodiment 3

[0043] The aluminum extraction residue from fly ash was ball milled for 10 minutes to make the average particle size reach 2 μm. Sodium hydroxide and fly ash aluminum extraction residue are mixed according to the mass ratio of 1:1, placed in a muffle furnace, and calcined at 700 ° C for 3 hours to obtain a calcined product;

[0044] The above calcined product was ball milled for 10 min to make the average particle size reach 1 μm. According to the calcined product and hydrochloric acid mass ratio 1:3, add the hydrochloric acid that concentration is 15wt% to the calcined product, after the stirring velocity is 500r / min magnetic stirring 10h, filter, obtain filtrate;

[0045] The above-mentioned filtrate was washed with water until the pH value was equal to 7, then centrifuged at 2000r / min for 10min, and dried at 80°C for 12h to obtain silica powder.

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Abstract

The invention discloses a method for preparing silicon dioxide micropowder by using pulverized fuel ash extracted aluminum residue as a raw material and the silicon dioxide micropowder. The method for preparing the silicon dioxide micropowder by using the pulverized fuel ash extracted aluminum residue as the raw material comprises the following steps: step one. mixing sodium hydroxide and the pulverized fuel ash extracted aluminum residue, and calcining so as to obtain a calcination material; and step two. adding hydrochloric acid to the calcination material, reacting, filtering and drying so as to obtain the silicon dioxide micropowder. The method is characterized in that sodium silicate and sodium metaaluminate can be formed by mixing and calcining the sodium hydroxide and the pulverized fuel ash extracted aluminum residue; meanwhile, other carbon-containing substances in the pulverized fuel ash extracted aluminum residue can also be converted into carbon oxide so as to be removed; after the hydrochloric acid to the calcination material, aluminium chloride, sodium chloride soluble salt and silicon dioxide precipitates are generated by reaction, so that silicon dioxide is separated out; and the silicon dioxide micropowder with relatively high purity can be obtained by filtration and drying. The method is simple in technological operation, relatively short in operating period and suitable for large-scale recovery and production of large-scale silicon dioxide micropowder.

Description

technical field [0001] The invention relates to the field of silica preparation, in particular to a method for preparing silica micropowder using fly ash aluminum extraction residue as a raw material and the silica micropowder. Background technique [0002] Silica micropowder, as a widely used micropowder raw material, has excellent properties such as good temperature resistance, acid and alkali corrosion resistance, controllable particle size distribution, high insulation, low expansion, stable chemical properties, and high hardness. It is widely used in special Ceramics, chemical industry, electronics, plastics, advanced paint, rubber, national defense and other fields. Since entering the 1990s, my country's electronics industry has developed rapidly, and the scale of the circuit board industry has risen to the second place in the world, and has participated in world competition. As a result, the demand for silica powder products soared. Although my country's quartz rese...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/18
Inventor 郭昭华李飞王永旺严春杰王洪权张晓煜王强韩军
Owner CHINA SHENHUA ENERGY CO LTD
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