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Preparation method of silicon beads with high hydration activity

An active silicon and active technology, which is applied in the field of preparation of high hydration active silica beads, can solve the problems of concrete expansion and difficulty in application, and achieve the effect of improving performance

Inactive Publication Date: 2018-12-21
江苏恒大高性能材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the residual hydrogen peroxide in the silica fume will release oxygen, causing the concrete to expand, it is still difficult to apply the silica fume waste from polysilicon enterprises to cement concrete

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0014] Specific embodiment one, a preparation method of high hydration activity silica beads, characterized in that the steps are:

[0015] a. Add sodium silicate soda slag and polycrystalline silicon powder waste into the vertical mill at a weight ratio of 3-4:1 at the same time, and blow the hot air into the vertical mill with a temperature of 500℃ and carbon dioxide accounted for 15% (volume percentage) ;

[0016] b. The carbon dioxide gas in the vertical mill fully reacts with the sodium silicate slag, so that the sodium silicate hydrate in the sodium silicate slag is converted into sodium carbonate and silica, which is an ultrafine powder Direct reaction with gas phase, low crystallinity, high reaction activity;

[0017] c. The hot air entering the vertical mill simultaneously decomposes the hydrogen peroxide in the polysilicon powder waste into water and oxygen, and no longer causes the expansion of the concrete, so that the local oxidation of the polysilicon waste in the high...

specific Embodiment 2

[0021] Specific embodiment two, a preparation method of high hydration activity silica beads, the steps are:

[0022] a. Add sodium silicate soda slag and polycrystalline silicon powder waste into the vertical mill at a weight ratio of 3-4:1 at the same time, and blow hot air into the vertical mill with a temperature of 550℃ and carbon dioxide accounting for 18% (volume percentage) ;

[0023] b. The carbon dioxide gas in the vertical mill fully reacts with the sodium silicate slag, so that the sodium silicate hydrate in the sodium silicate slag is converted into sodium carbonate and silica, which is an ultrafine powder Direct reaction with gas phase, low crystallinity, high reaction activity;

[0024] c. The hot air entering the vertical mill simultaneously decomposes the hydrogen peroxide in the polysilicon powder waste into water and oxygen, and no longer causes the expansion of the concrete, so that the local oxidation of the polysilicon waste in the high-temperature gas improves...

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Abstract

The invention relates to the technical field of preparation of cement raw materials and in particular relates to a preparation method of silicon beads with high hydration activity. According to the method provided by the invention, sodium silicate hydrate in sodium silicate alkali dreg is transformed into sodium carbonate and silicon dioxide; silicon dioxide is ultrafine powder and directly reactswith a gas phase; the crystallization degree is relatively low and the reaction activity is relatively high; original silicon dioxide in the sodium silicate alkali dreg is a product obtained by quenching at 1300 to 1500 DEG C; high-temperature gas is decomposed into water and oxygen through hydrogen peroxide in a polycrystalline silicon powder raw material at the same time, and concrete is not expanded any more; the reaction activity of the polycrystalline silicon waste material is improved through local oxidization in the high-temperature gas. The granularity of the ground sodium silicate alkali dreg is mainly in a range of 10 to 30 mu m, and the granularity of the polycrystalline silicon waste material is mainly in a range of 1 to 3mu m; the ground sodium silicate alkali dreg and the polycrystalline silicon waste material are matched, so that final grain size gradation of a product is optimized and the performance of the silicon beads with high hydration activity is improved.

Description

Technical field [0001] The invention relates to the technical field of the preparation of cement raw materials, in particular to a method for preparing high-hydration active silica beads. Background technique [0002] With the further strengthening of environmental protection requirements, the comprehensive utilization of various industrial wastes has received extensive attention. Fly ash, slag, steel slag and other industrial wastes have attracted special attention due to their large emissions, and their comprehensive utilization rate has been continuously improved. The current comprehensive utilization rate of slag has reached 100%, and the comprehensive utilization rate of fly ash and steel slag has also been steadily increased. However, due to the relatively low output of some non-mainstream industrial waste residues, there is little research on its comprehensive utilization, and its discharge causes a serious burden on the environment. [0003] Sodium silicate soda slag is a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/24
CPCC04B7/243Y02P40/10
Inventor 蔡林虎蔡明金李科徐达军陆新
Owner 江苏恒大高性能材料有限公司
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