RU1813754C - Process for manufacturing cement clinker - Google Patents

Abstract

The invention makes it possible to obtain Portland cement clinker according to a new method by roasting a coarsely ground raw mixture in a rotary kiln using a clay component of any material composition, the carbonate component is heated to 110-100 ° C before firing at a temperature rise rate of 1.2-7. 5 ° C for 1 s. The carbonate component is then mixed with the clay component previously calcined at a temperature of 900 ° C for 15 minutes, calcined to a sintering temperature and held for 20 minutes. Preheating the carbonate component eliminates the blockage of the decarbonization processes of the clay component by the melt and inhibits the melt diffusion process into the grain depth of the calcareous component. In this case, the firing process is intensified and energy consumption is reduced. 2 tables,

Description

The invention relates to the building materials industry, mainly to methods for producing Portland cement clinker.

The purpose of the invention is the intensification of the firing process and the reduction of energy costs.

The goal is achieved in that a method for the production of cement clinker, comprising preliminary separate heat treatment of the clay component at a temperature of 900 ° C and a carbonate component at a temperature of 1100-1200 ° C, followed by their firing, heat treatment of the carbonate component is carried out at a rate of temperature rise 1.2-2.75 ° C / s, with coarse components of the fraction up to 30 mm being subjected to heat treatment.

Examples of implementation.

The method has been tested on a raw mix of components of different material composition. As a carbonate component, the well-known coquina of Yevpatoria fraction 0-30 mm and the dense Chimkent marbled fraction 0-5 mm were used.

The chemical composition of limes is given in table. 1.

As the clay component, sand dune of the fraction 0-1 mm, loess 0, -1 mm, phosphoslag 0-30 mm and diabase fraction 0-1 mm can be used. The mixtures were corrected for the given values of KH and cinder. The calcareous component was heated in a reactor. The heating rate was 1; 2-7.5 ° C for 1 s.

The clay component (phosphoslag, diabase) was calcined in a muffle furnace for 15 min at a temperature of 900 ° C. Burnt00

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These components were mixed in a rotary laboratory oven and fired for 20 minutes at a temperature of 1450 ° C. Clinker formation completion was determined by CaO-free. The results are shown in table. 2.

From the table. 2 it follows that the accepted boundary values for the heating rate and temperature allow one to obtain clinker from pipe-grind raw components of different material composition at a high heating rate of the carbonate component at a rate of 1.0 ° C in 1 s and 8.0 ° C in 1 s .

The accepted boundary values for the heating rate and temperature are substantially

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reduce energy consumption and intensify the process of clinker synthesis.

Claims (1)

SUMMARY OF THE INVENTION A method for the production of cement clinker, comprising preliminary separate heat treatment of a clay component at 900 ° C and a carbonate component at 1100-1200 ° C, followed by their firing, which, in order to intensify the firing process and reduce energy consumption, heat the processing of the carbonate component is carried out at a rate of temperature rise of 1.2-2.75 ° C / s, and the coarsely ground fraction components up to 30 mm are subjected to heat treatment. twenty Table 1 Table 2 Continuation of the table. 2