Method for preparing rapid hardening high-early-strength cement clinker

Abstract

The invention provides a method for preparing rapid hardening high-early-strength cement clinker. Limestone, monohydrallite milltailings, ordinary coal ash and gypsum serve as raw amterials, rapid hardening high-early-strength Belite sulphate aluminium cement clinker is calcined at the temperatures of 1350+ / -20 DEG C, the clinker comprises, by weight, 50-52% of C2S, 28-30% of C4A3S and 16-18% of C4AF and a small quantity of amorphous phase substances. According to the method, most of the used aluminous materials are monohydrallite milltailings which are industrial residues which are discharged by aluminium factories, the initial setting time of the obtained clinker is less than 5 minutes, more than 30MPa of the strength of 6 hours can be achieved, and at the same time, the 28d strength of the clinker can reach about 55 MPa.

Description

technical field

[0001] The invention relates to cement materials in the field of building materials, in particular to a method for preparing rapid-hardening early-strength Belite sulphoaluminate cement clinker. Background technique

[0002] my country's bauxite resources are relatively rich, but most of them belong to the diaspore type, and more than 80% of the bauxite has an aluminum-silicon ratio between 5 and 8. The Bayer process commonly used abroad cannot be used to produce alumina. According to the actual situation of my country's alumina mineral resources, to rationally utilize low-grade ore resources, Chinese scientific and technological workers proposed a new process route of "Ore Dressing-Bayer Process to Produce Alumina", and gradually promoted it in various aluminum companies in China, becoming At present, the most important production process in my country's alumina industry. The use of this new production process requires beneficiation of bauxite that is genera...

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