A kind of layered strontium disilicate and its preparation method and application
A strontium silicate and layered technology, which is applied in the field of layered strontium disilicate and its preparation, can solve the problems of low purity and high impurity content of inorganic silicon-strontium composite materials, and achieve simple preparation process, low cost and energy saving Effect
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Embodiment 1
[0022] S1. Prepare a sodium silicate aqueous solution with a concentration of 0.01 mol / L and an aqueous strontium chloride solution with a concentration of 0.01 mol / L, respectively. Stir and mix the sodium silicate aqueous solution and strontium chloride aqueous solution according to the volume ratio of 1:1.2, then place the resulting mixed solution in a hydrothermal reaction kettle, raise the temperature to 260°C at a rate of 10°C / min, and stir for 2 hours , to obtain the hydrothermal reaction product;
[0023] S2. After cooling the hydrothermal reaction product to 50°C, filter it, and wash the obtained solid product with deionized water to neutrality, then dry it at 100°C for 4 hours, and then grind the dried product to a particle size D 90 0.4mm, layered strontium disilicate was obtained. After testing, the purity of the layered strontium disilicate is 95%. The SEM photo of the layered strontium disilicate is as figure 1 shown, from figure 1 It can be seen that it has a...
Embodiment 2
[0025] S1. Prepare a sodium silicate aqueous solution with a concentration of 0.5 mol / L and an aqueous strontium nitrate solution with a concentration of 0.5 mol / L, respectively. Stir and mix the sodium silicate aqueous solution and strontium nitrate aqueous solution according to a volume ratio of 1:4, then place the resulting mixed solution in a hydrothermal reaction kettle, heat up to 240°C at a rate of 5°C / min, and stir for 3 hours. Obtain hydrothermal reaction product;
[0026] S2. Cool the hydrothermal reaction product to 15°C and filter it, and wash the obtained solid product with deionized water to neutrality, then dry it at 100°C for 3 hours, and then grind the dried product to a particle size D 90 0.125mm, to obtain layered strontium disilicate. After testing, the purity of the layered strontium disilicate is 98%. It can be seen from the scanning electron microscope photo that the layered strontium disilicate has a layered structure.
Embodiment 3
[0028] S1. Prepare sodium silicate aqueous solution with concentration of 0.3 mol / L and strontium bromide aqueous solution with concentration of 0.3 mol / L respectively. Stir and mix the sodium silicate aqueous solution and strontium bromide aqueous solution according to the volume ratio of 1:2.5, then place the resulting mixed solution in a hydrothermal reaction kettle, raise the temperature to 210°C at a rate of 15°C / min, and stir for 4 hours , to obtain the hydrothermal reaction product;
[0029] S2. After cooling the hydrothermal reaction product to 30°C, filter it, and wash the obtained solid product with deionized water to neutrality, then dry it at 100°C for 2 hours, and then grind the dried product to particle size D 90 0.1 mm, layered strontium disilicate was obtained. After testing, the purity of the layered strontium disilicate was 97.6%. It can be seen from the scanning electron microscope photo that the layered strontium disilicate has a layered structure.
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