SU606833A1 - Raw mixture for making binder - Google Patents

Description

(54). RAW MIXTURE TO RECEIVE A BINDER

conditional bauxites, slags and ashes of thermal power plants, containing А12Оз in the amount of not less than 35% and meeting the requirements of the metallurgical industry.

The carbonaceous additive is introduced into

the raw material mixture in order to create a uniform spab-reducing gaseous medium over the entire mass of granules of the raw material being burned, the mixture. At the same time, the simultaneous input of a KOMA correction component containing melt oxides and coal addition allows the sintering temperature of the raw mix to be reduced by 240-250 ° С, as compared with the sintering temperature of ferrous cement.

The reducing medium created due to the burning out of the carbon-containing additive in the firing process provides for the appearance in the crystalline lattice of calcium ferrites of surface and bulk defects caused by partial reduction, determines the high adhesive and strength properties of cement,

Three variants of raw mixtures were prepared from iron ore concentrate and limestone with additives of boxite and coal to obtain a shearer. The compositions of the resulting raw mixtures are given in table. one.

Raw mixtures were prepared by the wet method (moisture content of sludge - 379, grinding fineness on sieve No. 008 - 3%; and burned at 1050 ° С

After grinding the obtained clinkers to a specific surface area of 2,800 bytes, physical and mechanical tests were carried out on samples made from cement paste and hardening in air.

The test results are given in Table 1. 2

The proposed raw material mixture allows to obtain an effective mineral bond for unburned agglomeration of iron ore concentrates. The thinning obtained by low-temperature calcination (} 050 ° C) is characterized by high strength / adhesive properties.

Table 1

Compressive strength, kgf / cm, one day

table 2