A kind of preparation method of layered functional material calcium sulfoaluminate

Abstract

The invention relates to a preparation method of calcium sulfoaluminate, a layered functional material. The preparation method comprises the following steps: (1) mixing a certain proportion of calcium sulfate, aluminum hydroxide and calcium oxide into a fully back-mixed explosive nucleation reactor , and add water higher than that of each material for mixing; (2) Use a fully back-mixed explosive nucleation reactor to synthesize sulfur under the conditions of a rotor speed of 4000-6000rpm, a voltage of 220-330V, and nucleation of 8-16min Calcium aluminate gel, then crystallize calcium sulfoaluminate gel at 90-150°C for 12-16h, cool down to 30-50°C, stir for 12-16h, then heat up to 90-150°C, cycle 3-5 times, can The layered functional material calcium sulfoaluminate is prepared. The advantage of the present invention is: the preparation method of the layered functional material calcium sulfoaluminate of the present invention, calcium sulfate, aluminum hydroxide and calcium oxide are nucleated and grown in a full back-mixing explosive nucleation reactor through a "one-pot method" , which effectively simplifies the preparation process of calcium sulfoaluminate, shortens the preparation time, simplifies the reaction operation, and improves the production efficiency.

Description

technical field [0001] The invention belongs to the technical field of layered functional inorganic materials, in particular to a method for preparing layered functional material calcium sulfoaluminate. Background technique [0002] Calcium sulfoaluminate has a layered structure, and its structural formula can be written as [Ca 2 Al(OH) 6 ](SO 4 )0 3 , which is the main component of sulphoaluminate cement, sulphoaluminate expansion agent, etc. The properties of quick hardening, dry strength and micro expansion of minerals are closely related to the crystal sister of anhydrous calcium sulfoaluminate. [0003] After retrieval, Feng Xiuji, Liao Guanglin, etc. according to the molar ratio of CaCO 3 :Al 2 o 3 : CaSO 4 . 2H 2 O=3:3:1 mixed raw materials, kept at 1350°C for 2 hours, cooled rapidly to obtain anhydrous calcium sulfoaluminate powder crystals; then according to the mass ratio C 4 A 3 S: PbCl 2 =5:100 mixed, put into a platinum crucible and heat up to 850°C...

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[0003] After retrieval, Feng Xiuji, Liao Guanglin, etc. according to the molar ratio of CaCO 3 :Al 2 o 3 : CaSO 4 . 2H 2 O=3:3:1 mixed raw materials, kept at 1350°C for 2 hours, cooled rapidly to obtain anhydrous calcium sulfoaluminate powder crystals; then according to the mass ratio C 4 A 3 S: PbCl 2 =5:100 mixed, put into a platinum crucible and heat up to 850°C for 24 hours, then heat up to 950°C for 48 hours to prepare anhydrous calcium sulfoaluminate single crystals with a size of 50-100µm; the reaction time of this preparation method is relatively short. Long, the raw materials are fed in batches, and the operation is more troublesome

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