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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

Inactive Publication Date: 2008-08-27
中国高岭土有限公司
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing superfine white carbon black and nano-alumina with kaolin as raw material, so as to solve the problem that the comprehensive utilization efficiency of kaolin in the prior art is not high

Method used

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Embodiment

[0044] Embodiment: a kind of method using kaolin as raw material to prepare superfine white carbon black and nano-alumina, consists of following process steps successively:

[0045] (1) Calcination

[0046] Calcining kaolin at 610°C dehydrates kaolinite contained in kaolin to generate metakaolin, and its reaction formula is: Al 2 o 3 2SiO2 2 2H 2 O→Al 2 o 3 ·SiO2 2 +H 2 O;

[0047] (2) Leaching

[0048] Add the calcined kaolin to the hydrochloric acid solution at 95°C, then add sodium hexametaphosphate with a mass of 0.95% of the kaolin, and stir it, so that the chemical component alumina contained in metakaolin reacts fully with hydrochloric acid to form trichloro Aluminum, its reaction formula is: Al 2 o 3 +6HCl=2AlCl 3 +3H 2 O, so that silicon dioxide is dissolved from metakaolin to become amorphous silicon dioxide, and most of the amorphous silicon dioxide exists in a colloidal state; wherein, the mass percent concentration of hydrochloric acid solution is 20%...

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Abstract

Disclosed is a process for preparing superfine silica and nano-alumina by utilizing kaolin as raw materials. In the method, the kaolin is calcined, lixiviated and filtered, filter liquor containing silicon dioxide and a filter cake containing aluminum trichloride are obtained, then, the filter liquor and the filter cake are removed by impurity and post-treated, and finally the final product of the powder of the nano-alumina and the powder of the superfine silica are obtained. The process can prepare the superfine silica and the nano-alumina simultaneously, thereby achieving the comprehensive application of the kaolin, and the prepared two products are fine in product index and high in added value of products.

Description

technical field [0001] The invention relates to a method for preparing superfine white carbon black and nano-alumina by using kaolin as a raw material, and belongs to the technical field of preparation, purification and crystal form control of inorganic materials. Background technique [0002] Kaolin is an important non-metallic mineral resource, and it is called the four major non-metallic minerals together with mica, quartz and calcium carbonate. Kaolin is mainly composed of kaolinite minerals (kaolinite, dickite, pearlite, halloysite, etc.) in the crystal form of micro flakes, tubes, and laminations less than 2 microns. The ideal chemical formula is Al 2 o 3 -2SiO2 2 -2H 2 O, whose chemical composition is mainly composed of a large amount of Al 2 o 3 , SiO 2 and a small amount of Fe 2 o 3 、TiO 2 and a small amount of K 2 O, Na 2 Composed of O, CaO and MgO, pure kaolin contains SiO 2 46.51%, Al 2 o 3 was 39.53%. [0003] For a long time, most of the developm...

Claims

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Application Information

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IPC IPC(8): C01B33/113C01F7/30
Inventor 冯杰李勇张忠飞吴铭敏周竹发陈丽昆何琴朱明秀
Owner 中国高岭土有限公司
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