Method for preparing porous elemental silicon powder from natural aluminosilicate minerals
A technology of natural aluminosilicate and aluminosilicate, which is applied in silicon compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of by-product environmental pollution, poor pore structure uniformity, cumbersome preparation process, etc., and achieve the goal of preparing The method is simple, the source is extensive, and the effect of raw material cost is low
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[0020] The steps of the preparation method for preparing porous elemental silicon by using aluminosilicate natural ore are as follows:
[0021] 1) Remove impurities in aluminosilicate ore, such as MgO, CaO, etc.: fully crush aluminosilicate ore to 1000-10000 mesh, soak in 0.1-1mol / L dilute hydrochloric acid solution for 1-24h. Due to its loose structure and porous shape, aluminosilicate ores are easy to remove because the oxide impurities do not enter the interior of the mineral lattice. Therefore, fully immersing the ore in dilute hydrochloric acid can remove the oxide impurities in it, and obtain the main component of SiO 2 and Al 2 o 3 of powder.
[0022] Aluminosilicate ores are naturally occurring siliceous rocks, including but not limited to dickite, illite, kaolinite, anorthite, potassium mica, potassium feldspar, topaz, kyanite, sillimanite, etc. , whose main component is SiO 2 and Al 2 o 3 .
[0023] 2) Reaction between ore and metal reducing agent: After dryi...
Embodiment 1
[0030] Embodiment one: take dickite as raw material
[0031] 1) Take dickite and pulverize it, soak it in 1mol / L dilute hydrochloric acid solution for 1h, and obtain the main component of SiO 2 and Al 2 o 3 powder;
[0032] 2) Dried the dickite powder produced in step 1) and mixed it with magnesium powder at a molar ratio of 1:6, put it into a 650°C atmosphere tube furnace, fully calcined it for 4 hours in a vacuum environment, and took it out after cooling.
[0033] 3) Immerse the product obtained in step 2) in 0.5 mol / L dilute hydrochloric acid solution for 10 h with magnetic force stirring, pour off the supernatant and centrifuge. Pour in distilled water and ultrasonically clean for 10 minutes, then centrifuge and wash repeatedly. Seal the centrifuge tube with filter paper and dry it at 100° C. for 10 h to obtain porous elemental silicon.
Embodiment 2
[0034] Embodiment two: take dickite as raw material
[0035] 1) Take dickite and pulverize it, soak it in 1mol / L dilute hydrochloric acid solution for 1h, and obtain the main component of SiO 2 and Al 2 o 3 powder;
[0036] 2) Dried the dickite powder produced in step 1) and mixed it with magnesium powder at a molar ratio of 1:10, put it into an atmosphere tube furnace at 650°C, fully calcined it for 4 hours in a vacuum environment, and took it out after cooling.
[0037]3) Immerse the product obtained in step 2) in 0.1 mol / L dilute hydrochloric acid solution for 24 hours with magnetic force stirring, pour off the supernatant and centrifuge. Pour in distilled water and ultrasonically clean for 5 minutes, then centrifuge and wash repeatedly. Seal the centrifuge tube with filter paper and dry it at 100° C. for 10 h to obtain porous elemental silicon.
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