Controllable preparation method of high-purity wollastonite fibers
A technology of wollastonite fiber and wollastonite, which is applied in the direction of silicate, alkaline earth metal silicate, etc., can solve the problem of difficult removal of impurities such as carbonate, achieve controllable length-to-diameter ratio, reduce dosage, The effect of shortening the production cycle
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preparation example Construction
[0018] A controllable preparation method of high-purity wollastonite fiber of the present invention comprises the following steps.
[0019] 1) Grinding natural wollastonite raw materials to obtain wollastonite powder with an average particle size of 40-80 mesh;
[0020] Wherein, the content of calcium silicate in the natural wollastonite raw material in step 1) is greater than 90%.
[0021] 2) Mix the wollastonite powder obtained in step 1) with additives, place in a stirred reaction vessel, and react for 30-120 minutes at normal pressure and room temperature -100°C to obtain a reaction product;
[0022] Wherein, the auxiliary agent in step 2) is one or more of acetic acid, hydrochloric acid and oxalic acid; the concentration of the auxiliary agent is 0.1-3 mol / L; the addition amount of the leaching auxiliary agent is 3-25 mL / g.
[0023] 3) Suction filter and wash the reaction product obtained in step 2) to obtain a solid product and a filtrate.
[0024] 4) Take a certain ma...
example 1
[0030] The main chemical composition of wollastonite in the present embodiment is, by weight percentage: CaO46%, SiO 2 52%, other 2%; the specific process is as follows:
[0031] 1) Take 100 g of the above 50 mesh wollastonite powder, prepare 830 mL of 0.1 mol / L hydrochloric acid solution, then pour the wollastonite powder into the hydrochloric acid solution, stir and react at room temperature for 55 min, and filter with suction after the reaction is completed to obtain filtrate and solid reactants;
[0032] 2) Take 50 grams of the above solid reaction product, add 650 mL of tap water, and add 8 grams of sodium hexadecylbenzenesulfonate, stir evenly at 100°C and sieve; to obtain wollastonite fibers of different particle sizes, the product Wash and dry separately to obtain high-purity wollastonite fibers with different aspect ratios;
[0033] 3) The content of wollastonite in the wollastonite fiber material obtained above is 99.6%, and the aspect ratio is controllable.
example 2
[0035] The main chemical composition of wollastonite in the present embodiment is, by weight percentage: CaO48%, SiO 2 50%, other 2%; the specific process is as follows:
[0036] 1) Take 80g of the above-mentioned 60-mesh wollastonite powder, prepare 760 mL of 0.1 mol / L acetic acid solution, then pour the wollastonite powder into the acetic acid solution, stir and react at 75 °C for 85 min, and suction filter after the reaction is completed Obtain filtrate and solid reactant;
[0037] 2) Take 60 grams of the above solid reaction product, add 540 mL of tap water, and add 3 grams of sodium cetylbenzenesulfonate and 2 grams of sodium cetyl sulfate, stir at 80 °C and sieve; Wollastonite fibers with different diameters are washed separately and dried to obtain high-purity wollastonite fibers with different length-to-diameter ratios;
[0038] 3) The content of wollastonite in the wollastonite fiber material obtained above is 98.7%, and the aspect ratio is controllable.
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