A preparation method of Portland cement clinker with low heat consumption, low silicon rate and high strength

Abstract

The invention discloses a preparation method of portland cement clinker with low heat consumption, low silicon content and high strength. The value range is reduced to 2.0±0.1, thereby increasing the content of flux minerals during clinker calcination, increasing the content of liquid phase, and improving the sinterability of raw meal, thereby reducing the coal consumption of clinker calcination; at the same time, increasing the clinker saturation ratio and adjusting the aluminum ratio make It is adapted to the operating state of the rotary kiln, and the C3S content in the clinker is increased to ensure the strength of the clinker; and through the optimization and improvement of the calcination process, the agglomeration in the kiln caused by the high liquid phase content is prevented. The method of the invention reduces energy consumption and CO2 emission, but does not reduce the strength of the clinker, and other properties of the clinker such as setting time, stability, f-CaO and MgO content all meet the national standards.

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

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