Process for preparing amorphous silica from kimberlite tailing
A technology of amorphous silicon dioxide and silicon dioxide, which is applied in the field of preparing soluble alkali metal silicate and amorphous powder, can solve the problems of long reaction time, economic infeasibility, and economic impact.
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Embodiment 1
[0079] 2.7 kg of kimberlite was treated with a 1:1 mixture of hydrochloric acid:water at 95-100°C under continuous stirring, maintaining a solid to liquid ratio of 1:4 for 3 hours, then the slurry was filtered and washed with tap water until Moist solid cake has no acid. The cake was dried in an oven at 100-110°C and used for the preparation of sodium silicate. To prepare sodium silicate, 0.64 kg of base was dissolved in 8 lit of water and placed in a stainless steel autoclave. To this autoclave, under continuous stirring, 2 kg of acid-treated kimberlite was added to prepare a homogeneous slurry. The reactor is heated at boiling temperature for 1 to 3.5 hours. After the reaction was complete, the slurry was filtered through a vacuum filter. Analysis of filtrate for SiO 2 and Na 2 O. Depending on the time of alkali digestion, SiO 2 / Na 2 O molar ratio is 3-3.6.
Embodiment 2
[0081] will contain SiO 2 =17.66%, Na 2 O = 5.64%; SiO with a coefficient of 3.24 2 / Na 2 199 g of sodium silicate of O was introduced into a stainless steel reactor equipped with a pitch blade stirrer and diluted to 640 ml to adjust the silica concentration to 55 g / liter. By adding soluble sodium salt, the Na of this solution + The ion concentration was adjusted to 22.3 g / liter. Prior to the initial neutralization process, the sodium silicate solution was heated and the temperature was raised to 70°C and 2.3N sulfuric acid was added at a controlled rate of 6.2ml / min over a period of 5 minutes. After 5 minutes, the acid addition was interrupted for 10 minutes. The remaining acid at the same concentration was then added at a rate of 3.6 ml / min until the pH of the reaction mixture was 4. The slurry was then stirred for an additional 5 minutes, filtered, washed until free of adhering anions, dried in an air circulating oven, and comminuted to a fine size. The properties of...
Embodiment 3
[0083] will contain SiO 2 =13.9%, Na 2 O = 4.78%; SiO with a coefficient of 3.2 2 / Na 2 201 g of sodium silicate of O was introduced into a stainless steel reactor equipped with a pitched blade stirrer and diluted to 466 ml to adjust a silica concentration of 60 g / liter. By adding soluble sodium salt, the Na of this solution + The ion concentration was adjusted to 22.7 g / liter. Prior to the initial neutralization process, the sodium silicate solution was heated and the temperature was raised to 70°C and 2.39N sulfuric acid was added at a controlled rate of 6.5ml / min over a period of 5 minutes. After 5 minutes, the acid addition was interrupted for 10 minutes. The remaining acid at the same concentration was then added at a rate of 2.8 ml / min until the pH of the reaction mixture was 4. The slurry was then stirred for an additional 5 minutes, filtered, washed until free of adhering anions, dried in an air circulating oven, and comminuted to a fine size. The properties of ...
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