Preparation method of layered functional material calcium sulphoaluminate

Abstract

The invention relates to a preparation method of layered functional material calcium sulphoaluminate. The preparation method comprises the following steps of: (1) mixing a certain proportion of calcium sulfate, aluminum hydroxide and calcium oxide in a full backmixing explosive nucleation reactor, and adding water more than the materials to mix; and (2) synthesizing calcium sulphoaluminate gel under the conditions that the revolving speed of a rotor is 4,000-6,000 rpm, the voltage is 220-330 V and the nucleating time is 8-16 min by adopting the full backmixing explosive nucleation reactor, then enabling the calcium sulphoaluminate gel to be crystallized for 12-16 h at 90-150 DEG C, cooling to 30-50 DEG C, stirring for 12-16 h, then heating to 90-150 DEG C, and circulating 3-5 times to prepare the layered functional material calcium sulphoaluminate. The preparation method of the layered functional material calcium sulphoaluminate has the advantages that the calcium sulfate, the aluminumhydroxide and the calcium oxide can nucleate and grow in the full backmixing explosive nucleation reactor through a 'one-pot method', the preparation process of the calcium sulphoaluminate is effectively simplified, the preparation time is shortened, the reaction operation is simplified, and the production efficiency is improved.

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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