Aluminous cement containing nano calcium carbonate and preparation method thereof

Abstract

The invention relates to calcium aluminate cement containing nanometer-sized calcium carbonate and a preparation method thereof. The preparation method of the calcium aluminate cement containing nanometer-sized calcium carbonate is based on calcium aluminate used in prior refractory material by adding nano calcium carbonate powder and alumina micropowder. The invention solves the shortcoming of low mid-temperature strength in prior calcium aluminate, and particularly greatly improves the strength around 800 DEG C. The monolithic refractory containing the combined nanometer-sized calcium carbonate has a small change in cold strength under 800 DEG C and 1600 DEG C burning, and the strength of the cold state and the hot state is greatly increased compared with that of prior ordinary monolithic refractory containing the same quantity of CaO made by combining calcium aluminate cement. The invented nanometer-sized calcium aluminate cement containing calcium carbonate can be broadly used in producing refractory material such as refractory casting material, spray material, etc., and can greatly improve mid-temperature strength of material.

Description

technical field [0001] The invention belongs to the technical field of inorganic non-metallic materials. Specifically, the invention relates to calcium aluminate cement containing nano-calcium carbonate and a preparation method thereof. Background technique [0002] Calcium aluminate cement is an inorganic non-metallic cementitious material. It is mainly made of alumina-containing raw materials such as bauxite, iron bauxite or industrial alumina, and calcium oxide-containing raw materials such as limestone. After sintering or melting, It is made by crushing and fine grinding, and its main mineral phase is calcium aluminate (CA) and / or calcium dialuminate (CA) 2 ). Calcium aluminate cement is mostly produced by sintering method, and a small amount of high-purity calcium aluminate cement with alumina content higher than 70% is produced by electric melting method. Calcium aluminate cement is generally classified according to the alumina content, which is divided into ordinar...

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Problems solved by technology

[0006] The feature of the present invention is to use the advantages of fine particle size of nano-calcium carbonate powder, high activity of its decomposition product calcium oxide, and in-situ reaction with alumina to form calcium aluminate series high-melting point minerals, etc., to improve the disadvantage of low temperature strength of calcium aluminate cement , a new type of calcium aluminate cement containing nano-calcium carbonate was prepared