Method for synthesizing tobermorite whiskers by sodium silicate

A technology of tobermullite and sodium silicate, which is applied in the direction of silicate and alkaline earth metal silicate, can solve the problems of irregular shape, high production cost and complicated synthesis process, so as to promote the production and improve the Purity, the effect of high purity

Active Publication Date: 2012-09-19
CENT SOUTH UNIV
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Problems solved by technology

The invention patent "Synthesis of acicular wollastonite powder using desilication lye" (application number 201010254879.4) discloses the preparation of desilication lye obtained in the process of pre-desilication of potassium-rich rock or fly ash or coal gangue. The method of acicular wollastonite powde

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  • Method for synthesizing tobermorite whiskers by sodium silicate
  • Method for synthesizing tobermorite whiskers by sodium silicate
  • Method for synthesizing tobermorite whiskers by sodium silicate

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[0024] Example 1: On SiO 2 Add caustic alkali with a concentration of 50g / L to the sodium silicate solution with a concentration of 20g / L, mix the mixed solution with milk of lime at a calcium-silicon molar ratio of 1, stir and mix well, then put it into the reaction kettle, and press 2°C / min The temperature was raised to 240°C at a speed of 3.2MPa, stirred at a constant temperature of 100rpm under a pressure of 3.2MPa for 6 hours, and then cooled to room temperature naturally, and the filter cake was obtained by filtering the slurry. After drying the filter cake, XRD analysis showed that the main phase was Needle soda limestone, while tobermorite is produced in lesser amount.

Example Embodiment

[0025] Example 2: On SiO 2 Add caustic alkali with a concentration of 100g / L to the sodium silicate solution with a concentration of 20g / L, mix the mixed solution with milk of lime at a calcium-silicon molar ratio of 1, stir and mix well, put it into the reaction kettle, and set the temperature at 2.5°C / min The temperature was raised to 240°C at a speed of 3.2MPa, stirred at a constant temperature of 200rpm under a pressure of 3.2MPa for 8 hours, and then naturally cooled to room temperature, the slurry was filtered to obtain a filter cake, and the filter cake was dried and analyzed by XRD. It was known that the product contained needle sodium Mollite and tobermullite, but compared with the solution without adding caustic alkali, the amount of soda limestone was significantly reduced, while the amount of tobermullite was greatly increased.

Example Embodiment

[0026] Example 3: On SiO 2 Add caustic alkali with a concentration of 100g / L to the sodium silicate solution with a concentration of 30g / L, mix the mixed solution with milk of lime at a calcium-silicon molar ratio of 1, stir and mix well, then put it into the reaction kettle, and press 3°C / min The temperature was raised to 240°C at a speed of 3.2 MPa, and the temperature was stirred at a speed of 200 rpm for 9 hours under a pressure of 3.2 MPa. After that, it was naturally cooled to room temperature, and the filter cake was obtained by filtering the slurry. The XRD analysis was performed after drying the filter cake. Composed of calcium stone and tobermorite.

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Abstract

The invention discloses a method for synthesizing tobermorite whiskers by sodium silicate, comprising the following steps of: preparing sodium silicate and caustic alkali into solution with a certain concentration; dissolving a chlorine-containing compound and an aluminum-containing compound according to a certain silicon-chlorine mol ratio and a certain silicon-aluminum mol ratio; mixing the prepared solution and lime milk according to a certain calcium-silicon mol ratio, using a dynamic hydrothermal method to perform constant-temperature and constant-pressure reaction in a reaction kettle; after reaction; and cooling and filtering the product to obtain the tobermorite whiskers. The method has a simple process and low energy consumption, and the purity of the synthesized tobermorite whiskers is high; the tobermorite whiskers prepared by the invention is needle-like, have complete crystallization surfaces, and can be applied in fields such as the building material, the petrifaction, the ceramic, the biological material, and the like. The comprehensive recovery of high-alkalinity sodium silicate waste liquid produced during the industrial production can be achieved. The method is suitable for industrial application.

Description

technical field [0001] The invention discloses a method for synthesizing tobermulite whiskers by using sodium silicate. It belongs to the technical field of inorganic non-metal material synthesis. Background technique [0002] Calcium silicate hydrate, also known as tobermullite, is the main component of calcium silicate insulation materials. The insulation materials composed of it have the characteristics of small bulk density, high temperature resistance and low thermal conductivity. Tobermullite is used as It is widely used as the main raw material of lightweight fireproof and thermal insulation building materials. In the field of biomaterials, tobermullite nanowires have the ability to rapidly induce the deposition of bone-like hydroxyapatite, and have good protein and cell adsorption functions, so as to improve the ability of bone formation and promote the process of bone repair. Restoration materials. [0003] During the comprehensive utilization of ores such as bau...

Claims

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Application Information

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IPC IPC(8): C01B33/24
Inventor 李光辉姜涛张元波张吉清范晓慧罗骏蒋昊郭宇峰杨永斌李骞陈许玲许斌朱忠平饶明军陈浩远曾精华
Owner CENT SOUTH UNIV
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