Synthesis technique for high-purity C*S minera

Abstract

The invention relates to a synthesis technique for high-purity C*S mineral, water is added into ethyl orthosilicate for hydrolysis, n-propyl alcohol and Ca(No3)2 aqueous solution are mixed with hydrolyzed ethyl orthosilicate to form even solution, under the action of nitric acid as a catalyst, the solution is stirred and reacted to obtain sol, and gel is gradually formed and then calcined to obtain C3S mineral after evaporation drying. The C3S mineral, which is synthesized by using the inventive technique, can be found in X-ray diffraction pattern by means of diffraction analysis of X-ray that the characteristic peak of C3S is extremely obvious and peak strength is high, but the characteristic peak of C2S and f-CaO is quite weak and unobvious. Therefore, the C3S mineral which is synthesized by using the inventive technique has high purity. By comparing standard powder diffraction fiche (PDF fiche), it is found that the resultant high-purity C3S phase is the closest to a monoclinic system.

Description

technical field [0001] The invention belongs to the technical field of civil engineering materials, in particular to a synthetic high-purity C 3 S (tricalcium silicate) mineral technology. Background technique [0002] A large number of scientific studies at home and abroad have confirmed that Portland cement (hereinafter referred to as cement) is the best inorganic hydraulic gelling material so far, and the essence of its gelling performance is the most important mineral C in cement clinker. 3 The C-S-H (calcium silicate hydrate) gel produced by S hydration forms a network structure. Therefore, C 3 The hydration, coagulation, and hardening behaviors of S minerals, especially the differences in the microstructure of C-S-H hydration products formed under different conditions, will directly affect the performance of cement-based materials. Synthesis of high-purity C under laboratory conditions 3 S minerals and study C 3 The hydration of S single minerals and the formation...

AI Technical Summary

Problems solved by technology

Judging from the existing research results, since the raw materials are mixed in solid powder form, it may lead to uneven mixing of the reactants, difficulty in ion diffusion during the calcination process, high firing temperature, long time, and high energy consumption, especially for the final product. The content of f-CaO in medium is still high, and contains C 2 S

Therefore, a solid-phase method was used to synthesize C 3 S minerals have at least the following disadvantages: First, the purity of the final product obtained is not high. According to the relevant literature that can be consulted at present, the content of f-CaO is in the lowest range of 0.24-0.77%, and contains a small amount of C 2 S minerals; second, the calcination temperature is high, reaching 1600°C; third, the efficiency is low, and the calcination is repeated 3-5 times, and the amount of finished product obtained each time is very small

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