Green environmentally-friendly method for smelting high-purity silicon
A smelting method and high-purity technology, applied in chemical instruments and methods, silicon compounds, inorganic chemistry, etc., can solve problems such as loss of crystalline silicon and environmental pollution, and achieve the effects of low production cost, improved purity, and improved smelting effect.
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Embodiment 1
[0043] (1) Mix 100kg of silica mud, SiO 2 3.3 kg was placed in a blender and stirred thoroughly for 30 minutes to make it completely mixed evenly to obtain a premix.
[0044](2) Encrypt and shape the premixed material with a processing machine to make a block with a particle size within the range of 10-20 mm, and put it into a drying room for 12 hours to dry completely so that the moisture content by weight is ≤0.4%.
[0045] (3) Heating the dried block material through an intermediate frequency furnace to completely melt the block material to obtain silicon liquid.
[0046] (4) Add NaCl 2kg, Na 2 CO 3 5kg, limestone 4Kg, bentonite 4Kg, NaNO 3 2kg and MnO 2 1kg, after adding, heat the silicon solution to 1600°C for 2h.
[0047] (5) Remove the silicon slag, and repeat step (4) once.
[0048] (6) Remove the silicon slag, add Li to the silicon liquid 2 CO 3 5Kg, Na 2 O 2Kg, CaO 5Kg, CaCl 2 2 parts, BaO 1Kg, SiO 2 10Kg, heat the silicon solution to 1800°C for 2h. ...
Embodiment 2
[0053] (1) Mix 100kg of silica mud, SiO 2 2kg was placed in a mixer, fully stirred for 30 minutes to make it completely mixed evenly to obtain a premix.
[0054] (2) Encrypt and shape the premixed material with a processing machine to make a block with a particle size within the range of 10-20 mm, and put it into a drying room for 12 hours to dry completely so that the moisture content by weight is ≤0.4%.
[0055] (3) Heating the dried block material through an intermediate frequency furnace to completely melt the block material to obtain silicon liquid.
[0056] (4) Add 1kg of NaCl, Na 2 CO 3 8kg, limestone 3Kg, bentonite 4Kg, NaNO 3 5kg and MnO 2 1.25kg, after adding, heat the silicon solution to 1500°C for 3h.
[0057] (5) scrape off the silicon slag, and repeat step (4) twice.
[0058] (6) Remove the silicon slag, add Li to the silicon liquid 2 CO 3 3Kg, Na 2 O 2Kg, CaO 8Kg, CaCl 2 4 parts, BaO 2Kg, SiO 2 8Kg, heat the silicon liquid to 1900°C for 1h.
[...
Embodiment 3
[0063] (1) Mix 100kg of silica mud, SiO 2 2.5 kg was placed in a blender and stirred thoroughly for 30 minutes to make it completely mixed evenly to obtain a premix.
[0064] (2) Encrypt and shape the premixed material with a processing machine to make a block with a particle size within the range of 10-20 mm, and put it into a drying room for 12 hours to dry completely so that the moisture content by weight is ≤0.4%.
[0065] (3) Heating the dried block material through an intermediate frequency furnace to completely melt the block material to obtain silicon liquid.
[0066] (4) Add NaCl 3kg, NaCl to the silicon liquid 2 CO 3 3kg, limestone 8Kg, bentonite 3Kg, NaNO 3 2kg and MnO 2 1kg, after adding, heat the silicon solution to 1700°C for 1h.
[0067] (5) Remove the silicon slag, and repeat step (4) once.
[0068] (6) Remove the silicon slag, add Li to the silicon liquid 2 CO 3 8Kg, Na 2 O 4Kg, CaO 3Kg, CaCl 2 2 parts, BaO 1Kg, SiO 2 15Kg, heat the silicon so...
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