Preparation method of low-heat-consumption low-silicon-rate and high-strength silicate cement clinker

Abstract

The invention discloses a preparation method of a low-heat-consumption low-silicon-rate and high-strength silicate cement clinker. According to the preparation method, when a cement clinker is calcined on a new dry process line, the silicon rate of the clinker breaks a traditional range of a new dry process kiln and is decreased to be 2.0+ / -0.1, so that the content of flux minerals in the calcining of the clinker is increased, the content of liquid phase quantity is increased, the burnability of a raw material is improved, and the calcining coal consumption of the clinker is reduced; meanwhile, the saturation ratio of the clinker is increased, and aluminum rate is adjusted to be applicable to an operation state of a rotary kiln, so that the content of C3S in the clinker is increased, and the strength of the clinker is guaranteed; by virtue of optimization and improvement of a calcining process, the agglomeration in the kiln caused by high liquid phase quantity is prevented; the energy consumption and the emission load of CO2 are reduced, but the strength of the clinker is not reduced, and other properties of the clinker such as coagulation time, stability and contents of f-CaO and MgO meet the national standard.

Description

technical field [0001] The invention belongs to the field of cement manufacture, and in particular relates to a method for preparing Portland cement clinker with low heat consumption, low silicon rate and high strength. Background technique [0002] The preparation method of Portland cement clinker is as follows: after calculating the ingredients by controlling the clinker ratio, the limestone raw materials, clay raw materials, and iron correction raw materials are mixed according to a certain ratio and ground to a certain fineness. Calcined at high temperature and then cooled to obtain Portland cement clinker. [0003] The cement clinker obtained by calcination is a multi-mineral aggregate, and these minerals are composed of Al 2 o 3 , SiO 2 , CaO, Fe 2 o 3 Composed of four main oxides. Therefore, in actual production, it is necessary to control the ratio between the oxides, that is, the rate value, and the rate value has also become the main index for quality control...

AI Technical Summary

Problems solved by technology

Due to the low 3d strength of clinker, it is difficult to increase the amount of cement admixture, the advantage of 28d strength of clinker cannot be brought into play, and the consumption of clinker in cement preparation is high

[0007] Due to the low proportion of flux minerals during clinker calcination when using normal ingredients, the amount of liquid phase is significantly reduced, and the clinker sintering system requires high requirements, which makes clinker calcination difficult, clinker granulation is not good, clinker quality is unstable, and it is easy to This results in a lot of flying sand, low pass rate of f-CaO (free calcium oxide), low clinker 3d strength, and relatively high coal consumption during calcination

If the sinterability of the raw meal is simply improved by reducing the silicon rate, the silicate minerals in the clinker will be reduced, thereby affecting the strength of the cement clinker. When the silicon rate is too low, due to the excessive liquid phase, it is easy to appear Agglomeration, nodules, rings, etc., seriously affect the operation of the kiln

Images