Method for preparing silicon dioxide micropowder by using pulverized fuel ash extracted aluminum residue as raw material and silicon dioxide micropowder
A technology for extracting aluminum and silicon dioxide from fly ash, which is applied in the direction of silicon dioxide and silicon oxide, can solve the problems of long production cycle and complicated reaction steps, and achieve the effect of short operation cycle and simple process operation
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Embodiment 1
[0035] The aluminum extraction residue from fly ash was ball milled for 5 minutes to make the average particle size reach 3 μm. Sodium hydroxide and fly ash aluminum extraction residue are mixed according to the mass ratio of 0.5:1, placed in a muffle furnace, and calcined at 900°C for 1 hour to obtain a calcined product;
[0036] The above-mentioned calcined product was ball milled for 2 minutes to make the average particle size reach 5 μm. Adding hydrochloric acid with a concentration of 10wt% to the calcined product according to the mass ratio of the calcined product to hydrochloric acid of 1:1, after stirring at a stirring speed of 1000r / min for 5h, filtering to obtain the filtrate;
[0037] The above-mentioned filtrate was washed with water until the pH value was equal to 7, then centrifuged at 4000r / min for 5min, and dried at 70°C for 10h to obtain silica powder.
Embodiment 2
[0039] The aluminum extraction residue from fly ash was ball milled for 15 minutes to make the average particle size reach 0.5 μm. Sodium hydroxide and fly ash aluminum extraction residue are mixed according to the mass ratio of 2:1, placed in a muffle furnace, and calcined at 900°C for 5 hours to obtain a calcined product;
[0040] The above-mentioned calcined product was ball milled for 5 minutes to make the average particle size reach 3 μm. Add hydrochloric acid with a concentration of 30wt% to the calcined product according to the mass ratio of the calcined product to hydrochloric acid of 1:5, and filter after magnetic stirring at a stirring speed of 2000r / min for 2h to obtain a filtrate;
[0041] The above-mentioned filtrate was washed with water until the pH value was equal to 7, then centrifuged at 3000r / min for 15min, and dried at 170°C for 5h to obtain silica powder.
Embodiment 3
[0043] The aluminum extraction residue from fly ash was ball milled for 10 minutes to make the average particle size reach 2 μm. Sodium hydroxide and fly ash aluminum extraction residue are mixed according to the mass ratio of 1:1, placed in a muffle furnace, and calcined at 700 ° C for 3 hours to obtain a calcined product;
[0044] The above calcined product was ball milled for 10 min to make the average particle size reach 1 μm. According to the calcined product and hydrochloric acid mass ratio 1:3, add the hydrochloric acid that concentration is 15wt% to the calcined product, after the stirring velocity is 500r / min magnetic stirring 10h, filter, obtain filtrate;
[0045] The above-mentioned filtrate was washed with water until the pH value was equal to 7, then centrifuged at 2000r / min for 10min, and dried at 80°C for 12h to obtain silica powder.
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