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Method for preparing calcium magnesium silicate powder

A calcium magnesium silicate, powder technology, applied in the direction of silicate, alkaline earth metal silicate, etc., can solve the problems of difficulty in large-scale promotion, low solid content of silica sol, high price, and achieve good powder dispersion and particle size. Small, low-cost effects

Inactive Publication Date: 2014-11-12
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the above-mentioned problems existing in the prior art, the present invention provides a kind of method for preparing calcium magnesium silicate powder, described this method will solve the low solid content of silica sol in the existing preparation method, the price is high, it is difficult to Technical Issues of Scale-Up

Method used

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Examples

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Effect test

Embodiment 1

[0021] According to the molar ratio of calcium nitrate: magnesium nitrate: sodium silicate: urea = 2:1:2:6, the calcium nitrate, magnesium nitrate and urea are completely dissolved in deionized water, and then the sodium silicate dissolved in water Pour it in, then heat it to 90°C with a magnetic stirrer, and after stirring continuously for 1 hour, move the solution directly into a high-temperature sintering furnace preheated to 650°C, burn violently with the evaporation of water, and obtain a fluffy foam product, which XRD and SEM images are as follows figure 1 and figure 2 As shown, it can be seen from the XRD figure that the product is basically calcium magnesium silicate Ca 2 MgSiO 7 Phase, as can be seen from the SEM image, the average particle size of calcium magnesium silicate powder is 0.1mm.

[0022]

Embodiment 2

[0024] According to the molar ratio of calcium nitrate: magnesium nitrate: sodium silicate: urea = 1:1:1:30, the calcium nitrate, magnesium nitrate and urea are completely dissolved in deionized water, and then the sodium silicate dissolved in the water Pour it in, then heat it to 100°C with a magnetic stirrer, and after stirring continuously for 0.3 hours, move the solution directly into a high-temperature sintering furnace preheated to 800°C, and burn violently with the evaporation of water to obtain a fluffy foam product, and the rest The implementation conditions are all the same as in Example 1, and the CaMgSiO with an average particle diameter of about 0.38mm is obtained. 4 pink.

[0025]

Embodiment 3

[0027] According to the molar ratio of calcium nitrate: magnesium nitrate: sodium silicate: citric acid = 2:2:2:3, the calcium nitrate, magnesium nitrate and citric acid are completely dissolved in deionized water, and then the silicon dissolved in the water Pour the sodium nitrate into it, then heat it to 95°C with a magnetic stirrer, and after 0.5 hours of continuous stirring, move the solution directly into a high-temperature sintering furnace preheated to 700°C, and burn violently with the evaporation of water to obtain a fluffy foam product , all the other implementation conditions are the same as in Example 1, and CaMgSiO with an average particle diameter of about 0.12mm is obtained. 4 pink.

[0028]

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Abstract

The invention relates to a method for preparing calcium magnesium silicate powder and belongs to the field of preparation of inorganic nonmetal superfine powder. The method comprises the following steps: firstly, weighing calcium nitrate, magnesium nitrate, sodium silicate and a reducer in a molar ratio being (1-2):(1-2):(1-2):(6-30); and then, fully dissolving calcium nitrate, magnesium nitrate and the reducer in deionizer water firstly, then, dissolving sodium silicate in water to prepare a sodium silicate aqueous solution, pouring the sodium silicate aqueous solution into the aqueous solution formed by calcium nitrate, magnesium nitrate and the reducer, then heating the aqueous solution by a magnetic stirrer to 90 DEG C-100 DEG C, continuously stirring for 0.3 hour-1 hour, and directly transferring the solution to a high temperature sintering furnace which is pre-heated to 650 DEG C-800 DEG C, wherein severe combustion happens along with water evaporation to obtain a fluffy foam-like product. By adopting sodium silicate which is relatively low in cost as a raw material, the method facilitates actual application. The prepared powder is good in dispersion and fine in granule. The equipment and the process are simple.

Description

technical field [0001] The invention belongs to the field of inorganic non-metal ultrafine powders, and in particular relates to calcium magnesium silicate, specifically a method for preparing calcium magnesium silicate powder. [0002] Background technique [0003] Long afterglow luminescent materials are materials that can absorb and store the energy of external light radiation during the day, and slowly release the stored energy in the form of visible light at night to achieve lighting effects. Compared with sulfide and aluminate long afterglow materials, silicate series long afterglow materials have good chemical stability and strong water resistance. The raw material SiO 2 It is cheap and easy to obtain, so the research and development of silicate-based phosphors have attracted widespread attention from all over the world. [0004] To obtain long afterglow materials, the preparation of the materials is the key. At present, the preparation of calcium magnesium silicat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/24
Inventor 江国健谢翠萍闵丽华王樱徐家跃申慧
Owner SHANGHAI INST OF TECH
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