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Tobermorite and synthetic method thereof

A technology for hydrated calcium silicate and aeolian sand, applied in the field of calcium silicate hydrate and synthetic calcium silicate hydrate, can solve the problems of limitation, chemical composition of calcium silicate hydrate and differences in microscopic morphology, etc. The effect of high added value, good market application prospect and low cost

Active Publication Date: 2017-09-15
内蒙古仁创沙漠资源利用研究院有限公司
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  • Summary
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The types of raw materials and water-solid ratio of the hydrothermal synthesis method are relatively consistent with the actual situation. It is an ideal method for laboratory synthesis of calcium silicate hydrate with better crystallization. On the one hand, there are large differences according to the change of reaction conditions, which are limited in practical application.

Method used

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  • Tobermorite and synthetic method thereof
  • Tobermorite and synthetic method thereof
  • Tobermorite and synthetic method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] (1) Take 1100 kg of aeolian sand, add 660 kg of water to the continuous scrubbing and desilting machine, add 500 g of sodium silicate as an auxiliary agent for scrubbing, and scrub for 20 minutes to obtain 1000 kg of aeolian sand after scrubbing. After scrubbing and purifying the aeolian sand, the silicon dioxide content was detected to be 98%. After scrubbing, the aeolian sand is wet-milled with a stirring mill, using ceramic grinding medium balls with less wear and high hardness, and a diameter of 1-10mm, adding 2kg of sodium chloride additives to mix and then rinsing, wet-grinding The time is 50 minutes, and the particle size index of the aeolian sand powder after wet grinding reaches 8-10 μm;

[0059] (2) Take desulfurized gypsum (CaSO 4 2H 2 O content is 90%) 2500kg, add 150kg fixed carbon content and be 88%, particle size is 200 mesh coke powders (purchased from Shanxi Qingxu Coking Plant, article number is C90) and carry out thermal reduction treatment as reduc...

Embodiment 2

[0064] The calcium silicate board product was prepared by the method of Example 1, except that in step (4), the temperature of the second reaction was 180° C., and the calcium silicate board product S2 was prepared. Electron microscope photo of product S2 and figure 2 Similarly, the XRD pattern is as image 3 .

Embodiment 3

[0066] The calcium silicate board product was prepared by the method of Example 1, except that in step (4), the temperature of the second reaction was 190° C., and the calcium silicate board product S3 was prepared. Electron microscope photo of product S3 and figure 2 Similarly, the XRD pattern is as image 3 .

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Abstract

The invention relates to tobermorite and a synthetic method thereof. The method comprises the following steps: (a) preprocessing aeolian sand, wherein the particle size of a preprocessed aeolian sand body is 5-20 microns, and the SiO2 content is not lower than 90wt%; (b) carrying out thermal reduction on desulfurized gypsum in the presence of a reduction agent, and digesting obtained quick lime, so as to obtain lime slurry; (c) mixing the preprocessed aeolian sand body, the lime slurry and optional water to generate first reaction, so as to obtain a first reactant; and (d) adding an activating agent and optional water into the first reactant to generate second reaction, so as to obtain a second reactant containing tobermorite. The method is low in development cost and little in pollution, the organic combination of the sand industry and green materials is realized, and synthesized tobermorite is high in added value and has good market application prospects.

Description

technical field [0001] The present disclosure relates to the technical field of new material synthesis, in particular, to a method for synthesizing calcium silicate hydrate and the calcium silicate hydrate synthesized by the method. Background technique [0002] Calcium silicate hydrate is based on CaO-SiO 2 -H 2 The general term for the ternary compounds that exist in the O system. Due to the complexity and cleanliness of its composition and structure, there are various types of calcium silicate hydrate. Generally speaking, when the temperature is higher than 100°C (the pressure is higher than 1 standard atmospheric pressure), the hydrothermally synthesized calcium silicate hydrate is in a good crystallization state, mainly including xonotlite and tobermullite; when the temperature is lower than 100 At ℃, the crystallinity of calcium silicate obtained is generally poor. Tobermolite (6CaO 5SiO 2 ·6H 2 O) is a calcium silicate hydrate with high crystallinity, which has s...

Claims

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Application Information

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IPC IPC(8): C01B33/24
Inventor 张延大
Owner 内蒙古仁创沙漠资源利用研究院有限公司
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