Preparation method of SiF4
A gaseous, mixture technology, applied in the direction of halogenated silicon compounds, halogenated silanes, etc., can solve the problems of high cost, high consumption of concentrated sulfuric acid and fluorite powder, high price of anhydrous hydrofluoric acid, etc., and achieve the effect of reducing the preparation cost.
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[0017] A SiF provided by the present invention 4 The preparation method comprises the following steps:
[0018] Step 101: mixing silicon-containing mineral raw materials or silicon-containing metal oxides with fluoride to obtain a mixture;
[0019] After the silicon-containing mineral raw material or silicon-containing metal oxide is mixed with the fluoride, a mixture to be reacted is obtained for subsequent preparation operations.
[0020] Step 102: reacting the mixture to obtain gaseous SiF 4 ;
[0021] After obtaining the mixture, react the mixture to obtain gaseous SiF 4 .
[0022] This method is used in the preparation of SiF 4 In the process, the raw materials used are silicon-containing mineral raw materials or silicon-containing metal oxides and fluorides, and the raw materials are much cheaper than traditional raw materials (concentrated sulfuric acid and fluorite powder or anhydrous hydrofluoric acid), thereby reducing SiF 4 preparation cost.
[0023] In addit...
Embodiment 1
[0036] Embodiment 1: with fly ash and NH 4 F as raw material to prepare high-purity SiF 4
[0037] Step 301: Fly ash (Al 2 o 3 · nSiO2 2 ) and NH 4 F mixed evenly to obtain a mixture;
[0038] Among them, NH 4 F accounts for the weight percent of mixture is 30%;
[0039] Step 302: Calcining the mixture at 600°C for 3 hours to obtain gaseous SiF 4 ;
[0040] Step 303: the gaseous SiF 4SiF with a purity of 99.0% was obtained after gas-liquid separation, concentrated sulfuric acid drying, molecular sieve adsorption and condensation purification. 4 gas.
[0041] In this example, the chemical reaction that takes place is as follows:
[0042] SiO 2 +4NH 4 F→SiF 4 ↑+4NH 3 ↑+2H 2 o
Embodiment 2
[0043] Embodiment 2: with coarse particle SiO 2 and CaF 2 Preparation of high-purity SiF as raw material 4
[0044] Step 401: Granular SiO with a particle size of 95-500 mesh 2 and CaF with particle size less than 7mm 2 Mix well to get a mixture;
[0045] Among them, CaF 2 The weight percentage that accounts for mixture is 40%;
[0046] Step 402: calcining the mixture at 1100°C for 2 hours to obtain gaseous SiF 4 ;
[0047] Step 403: the gaseous SiF 4 SiF with a purity of 99.9% was obtained after gas-liquid separation, concentrated sulfuric acid drying, molecular sieve adsorption and condensation purification. 4 gas.
[0048] In this example, the chemical reaction that takes place is as follows:
[0049] SiO 2 +2CaF 2 →SiF 4 ↑+2CaO
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