Preparation of silicon dioxide powder through molten salt method
A technology of molten salt method and powder, which is applied in the field of preparing crystalline SiO2 powder, which can solve the problems of high equipment requirements, high energy consumption, and low production efficiency, and achieve the effects of good crystallization performance, simple process, and fast synthesis speed
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Embodiment 1
[0021] Synthesis of Crystalline SiO by a Molten Salt Method 2 The powder method, the steps are as follows:
[0022] Measure tetraethyl silicate (10mL), isopropanol (40mL), and deionized water (10mL) in a volume ratio of 1:4:1, mix and stir evenly; add concentrated ammonia water drop by drop, until it is in a sol state, and continue stirring for 1h ; continue to add concentrated ammonia water drop by drop until obvious white precipitate appears, and continue to stir for 2 hours; the obtained precipitate is dried in an oven at 60 °C, and 5g NaCl+5g KCl is added to mix and grind evenly; the mixture is placed in a ceramic crucible and placed in a horse Heat treatment at 800°C for 2 hours in a Furnace; take it out after natural cooling, wash and dry with deionized water to obtain the product powder. The resulting SiO 2 The powder has good crystallinity and high purity, see figure 2 -a, powder morphology see image 3 -a.
Embodiment 2
[0024] Synthesis of Crystalline SiO by a Molten Salt Method 2 The powder method, the steps are as follows:
[0025] Measure tetraethyl silicate (10mL), isopropanol (40mL), and deionized water (10mL) in a volume ratio of 1:4:1, mix and stir evenly; add concentrated ammonia water drop by drop, until it is in a sol state, and continue stirring for 1h ; continue to add concentrated ammonia water drop by drop until obvious white precipitate appears, and continue to stir for 2 hours; the obtained precipitate is dried in an oven at 60 °C, and 5g NaCl+5g KCl is added to mix and grind evenly; the mixture is placed in a ceramic crucible and placed in a horse Heat treatment at 700°C in a Furnace for 2 hours; take it out after natural cooling, wash and dry with deionized water to obtain the product powder. The resulting SiO 2 Partially crystalline powder, see figure 2 -b, the powder particles are uniformly dispersed, with an average particle size of ~600nm, see image 3 -b.
Embodiment 3
[0027] Synthesis of Crystalline SiO by a Molten Salt Method 2 The powder method, the steps are as follows:
[0028] Measure tetraethyl silicate (10mL), isopropanol (40mL), and deionized water (10mL) in a volume ratio of 1:4:1, mix and stir evenly; add concentrated ammonia water drop by drop, until it is in a sol state, and continue stirring for 1h ;Continue to add concentrated ammonia water drop by drop until obvious white precipitate appears, and continue to stir for 2h; the obtained precipitate is dried in an oven at 60°C, and 10g KCl is added to mix and grind evenly; the mixture is placed in a ceramic crucible and placed in a muffle furnace Heat treatment at 800°C for 2 hours; take out after natural cooling, wash and dry with deionized water to obtain product powder. The resulting SiO 2 Partially crystalline powder, see figure 2 -c, powder particles have good dispersibility, uniform particle size, average particle size ~ 400nm, see image 3 -b.
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