SU614058A1 - Method of manufacturing cement clinker - Google Patents

Description

one

The invention relates to the cement industry, in connection with the technology of burning a granulated raw material mixture in kiln units equipped with convection calciners.

A dry method for the production of cement clinker is known, consisting in co-grinding of carbonate, clay and mineral oils and non-neutralizing components, heat treatment of the raw powder in baked heat exchangers and subsequent calcination in clinker in short rotary kilns tU.

The closest in technical essence and effect achieved to this invention is a method for producing cement clinker, shutting down the {Sh1: syng in the granulation of the raw mix, heat treating the obtained granules and subsequent calcining these granules and requesting a calciner during the rotation of the kiln 2.

However, the known methods have the disadvantages of increased heat consumption for firing and insufficiently high productivity of the kiln units.

The aim of the invention is to increase the productivity of the furnace, as well as to reduce the heat consumption for clinker burning.

This is achieved by granulating the raw material mixture, heat treating the obtained granules and applying it in a rotary kiln, while making a request. Before being fed into the furnace, it is mixed with solid fuel and a solid oxide oxidant.

The essence of the approach to the production of cement clinker is that when a mixture of solid fuel and solid oxidizer is fed into the rotary kiln, additional heat treatment of the non-decarbonated and partially decarbonized material falling through the calciner lattice takes place.

The proposed method for the production of cement clinker is as follows. jj The raw mix is granulated and fed to the lattice in the form of granules with a size of 5-20 mm with a moisture content of 12-15%. Vygat layer of granules on the grid regulate in the range of 150-200 mm. Gases from a rotary kiln with a temperature of about 1000 ° C are sucked from the top down through the bed of granules in the chamber adjacent to the oven. After that, they are cleaned of dust in cyclones and sucked in by the second exhauster from top to bottom through a layer of granules in the next chamber. The temperature of the material in the first chamber along the gas 400-800 ° C

IN the second 200-400 ° C. The material, heated to about 800 ° C and partially (by 25%) calcined, is fed from the grate into the oven with removable scrapers. The material falling through the grate in the amount of up to 15% of the consumption of dry raw material enters the chain conveyor, where coal is supplied — in an amount of 4% by weight of spillage, and also solid oxidizer — bleach. Chlorine lime P1Zh decomposed gives off atomic oxygen, which has a high oxidative capacity, and calcium chloride, which is a mineralizer. A mixture of spillage, a solid window shell, as well as dust collected from gases, is fed directly into a rotary kiln.

The implementation of the above method of clinker production will increase the productivity of new by 1.5% and reduce by 10% the heat consumption for clinker burning.

Claims (2)

1. Japanese Patent N 47-30404, C 04 B 7/44, 1972. 2. Tatarin V.I. and others. Cement industry abroad. Literature on construction, M., 1973.