Preparation method of high-purity silica sol
A silica sol, high-purity technology, applied in chemical instruments and methods, silicon compounds, inorganic chemistry, etc., can solve the problems of mechanical damage, semiconductor material pollution, high impurity content, etc., and achieve low cost, simple preparation steps, and high purity Effect
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example 1
[0018] First, weigh 150g of quartz sand, rinse it with clean water, pulverize it into a 120-mesh powder in a pulverizer, and then soak it in 23% hydrochloric acid for 50 minutes, and filter it with deionization. After rinsing the filtered material with water for 3 times, place it in an oven at 50℃ and dry it for 50min. After the drying is complete, place it in a calcination furnace. Under the protection of nitrogen, the calcination time is 50min and the temperature is 500℃. After the end, let it cool to room temperature naturally to obtain pure quartz sand powder; then weigh 40 g of pure quartz sand powder prepared above and 250 mL of 30% sodium hydroxide solution with mass fraction, mix and stir for 40 minutes, and then mix The turbid liquid was transferred to the reaction kettle, heated to 550°C, and the pressure of the reaction kettle was adjusted to 10MPa. When there was no precipitation in the reaction kettle, the temperature was lowered to 50°C, and 15% of the mixed liquid...
example 2
[0021] First, weigh 100g of quartz sand, rinse it with clean water, place it in a pulverizer and pulverize it into 100 mesh powder, and then soak it in 23% hydrochloric acid for 40 minutes, and filter it with deionization. After rinsing the suction filter twice with water, place it in an oven at 40℃ and dry it for 40min. After the drying is completed, place it in a calcination furnace. Under the protection of nitrogen, the calcination time is 40min and the temperature is 400℃. After calcination, let it cool to room temperature naturally to obtain pure quartz sand powder; then weigh 30 g of pure quartz sand powder prepared above and 200 mL of a 30% sodium hydroxide solution with a mass fraction of 30%, mix and stir for 30 minutes, and then The mixed turbid liquid is transferred to the reaction kettle, heated to 500°C, and the pressure of the reaction kettle is adjusted to 9MPa. When there is no precipitation in the reaction kettle, after cooling it to 45°C, add 10% hydrogen by ma...
example 3
[0023] First, weigh 120g of quartz sand, rinse it with clean water, place it in a pulverizer and pulverize it into 110 mesh powder, and then soak it in 23% hydrochloric acid for 45 minutes, and filter it with deionization. After rinsing the filtered material twice with water, it was placed in an oven at 45℃ and dried for 45min. After the drying was completed, it was calcined in a calcining furnace. Under the protection of nitrogen, the calcination time was 45min and the temperature was 450℃. After the calcination, let it cool naturally to room temperature to obtain pure quartz sand powder; then weigh 35 g of pure quartz sand powder prepared above and 210 mL of 30% sodium hydroxide solution with mass fraction, mix and stir for 35 minutes, and then The mixed turbid liquid is transferred to the reactor, heated to 520℃, and the pressure of the reactor is adjusted to 9MPa. When there is no precipitation in the reactor, after cooling it to 47℃, add 12% hydrogen by mass of the mixed li...
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