Method for preparing ultra-fine white carbon black and nano alumina by using kaolinite as raw material
A technology of nano-alumina and fine white carbon black, which is applied in the preparation of alumina/hydroxide, silicon oxide, etc., can solve the problem of low comprehensive utilization efficiency of kaolin, achieve high added value of products, good product indicators, and reduce corrosion and damaging effects
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[0044] Example: A method for preparing ultrafine white carbon black and nano alumina using kaolin as a raw material, which consists of the following process steps in sequence:
[0045] (1) calcination
[0046] The kaolin is calcined at 610℃ to dehydrate the kaolin contained in the kaolin to produce metakaolinite. The reaction formula is: Al 2 O 3 ·2SiO 2 ·2H 2 O→Al 2 O 3 ·SiO 2 +H 2 O;
[0047] (2) Extraction
[0048] Add the calcined kaolin to the hydrochloric acid solution at 95°C, then add sodium hexametaphosphate with 0.95% of the kaolin mass, and stir it, so that the chemical component alumina contained in the metakaolinite reacts with the hydrochloric acid to generate trichloride Aluminum, its reaction formula is: Al 2 O 3 +6HCl=2AlCl 3 +3H 2 O, so that silica can be dissolved from metakaolinite into amorphous silica, most of the amorphous silica exists in a colloidal state; wherein the mass percentage concentration of the hydrochloric acid solution is 20%, and the alumina T...
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