New method for preparing silicon dioxide by utilizing rice hull ash

A technology of silicon dioxide and rice husk ash, which is applied in the direction of silicon dioxide and silicon oxide, can solve the problems of difficulty in dissolving silicon, high energy consumption, and limited source of raw materials, so as to ensure product quality, reduce production energy consumption, and save The effect of equipment investment

Inactive Publication Date: 2011-01-12
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The above methods have problems such as difficulty in dissolving silicon with silica sand as raw material, high temperature rea

Method used

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  • New method for preparing silicon dioxide by utilizing rice hull ash
  • New method for preparing silicon dioxide by utilizing rice hull ash

Examples

Experimental program
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Effect test

Embodiment 1

[0031] by SiO 2 with NH 4 The molar ratio of F is 1:15. Weigh 2 kg of acid-washed rice husk ash and ammonium fluoride solution with a concentration of 4 mol / L and add it to the reaction kettle. The heat source is adjusted to 140°C for constant temperature heating, and the reaction is stirred under reflux for 3 hour, filtered while hot, the filtrate was added to ammonia water with a concentration of 30wt%, and precipitated, aged at 60°C for 1h, filtered, washed, and dried at 120°C for 12 hours to obtain spherical silica with an average particle size of 60nm. The yield was 96.9%.

Embodiment 2

[0033] The concentration of ammonium fluoride was changed to 3 mol / L, and the other conditions were as in Example 1, and spherical silica with an average particle diameter of 65 nm was obtained with a yield of 93.8%.

Embodiment 3

[0035] change SiO2 2 with NH 4 The molar ratio of F was 1:8, and other conditions were as in Example 1, and spherical silica with an average particle diameter of 65 nm was obtained with a yield of 84.6%.

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Abstract

The invention discloses a new method for preparing silicon dioxide by utilizing rice hull ash, comprising the following steps: neutralizing and dissolving the soluble impurities in the rice hull ash by utilizing a sulfuric acid solution; adding an ammonium fluoride solution in proportion; heating and dissolving to generate ammonium fluosilicate and discharge ammonia; modulating the concentration of the ammonia water to be 10-30wt% by the ammonia generated in the water recovering reaction; placing into a seal stillpot; regulating the temperature to be 50-90 DEG C; adding the ammonium fluosilicate solution into the ammonia water in proportion; separating out the sedimentation; ageing for 0.5-3h; filtering and performing solid-liquid separation; returning the filter liquor to a silicon dissolving procedure for recycling after the filter liquor concentration is adjusted; and washing and drying the filter cakes to obtain the silicon dioxide. The method of the invention takes the regenerated resource rice hull ash as a silicon source, and adopts constant-voltage low-temperature liquid phase dissolving silicon; and the reactant ammonium fluoride and the by-product ammonia can be recycled, which not only saves the energy consumption and lowers the cost, but also has no other by-product generation and no greenhouse gas emission, thus belonging to a low-carbon green new process.

Description

technical field [0001] The invention relates to a new method for preparing silicon dioxide from rice husk ash, in particular to a new method for using rice husk ash as a silicon source and ammonium fluoride as a solvent to prepare silicon dioxide and to recycle the solvent ammonium fluoride and by-product ammonia gas . Background technique [0002] 1. The use of biomass resources to produce silica is the trend of using renewable plant resources as raw materials [0003] At present, the world's energy and resource crisis makes the development and utilization of renewable resources a hot spot. Plant / crop-based renewable resources are the trend of research and utilization at home and abroad, especially in developed countries. It will become a supplement and substitute for non-renewable resources in the future, and change the current dependence on dwindling non-renewable resources. The entry of renewable resources into the raw material market has become an important part of th...

Claims

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Application Information

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IPC IPC(8): C01B33/12C01B31/08
Inventor 王子忱马晓宇朱燕超郭玉鹏丁雪峰赵旭
Owner JILIN UNIV
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