SU833689A1 - Method of producing portlandcement clinker - Google Patents

Description

I

This invention relates to Portland cement.

Izvesgen is a method of producing psrtland cement clinker, which consists in preliminary separate heat treatment of the clay and carbonate components, followed by roasting C.

The closest to the present invention is a method for producing psrtland cement clinker by roasting a thermo-treated raw material mixture of composition,%: CaO-.51.70-80, 35; HRP 12.5 OZO, 5O; AbdOz 3, OO-ll, OOj, 20-7.00. The sintering temperature of the clinker is G2}.

A disadvantage of the known method of obtaining portland cement clinker is the high sintering temperature.

The purpose of the invention is to intensify the burning process.

This goal is achieved by the fact that in the method of obtaining portland cement clinker by roasting a thermally treated raw mixture of the composition, wt.%

CaO, 51.70-80.35; SiO, 12.5-OZ, 50; A & aO 3, OO-11, O; Fea O 2,2O-7, OO, heat treatment at. 1OOO-125OS is subjected to a part of the mixture of the composition: CaO 45, OO-59.9 r; S-iO. 4, O5-1O, 55; AUd Oj O, 1O-5.97} O 0.61-3.03 in the amount of 5O-8O%, and at 1OOO-120O ° C the remaining mixture of composition: CaO 6.7O20, 45; SiO2 8.45-19.95; AOjpa2.9O5, p3; 1.59-3.97 in kopichestche 2O-5O% with their subsequent mixing and firing at 130О-135ОС.

The advantages of the proposed method for obtaining the pores of the heads of the cement-free clinker are that it allows to significantly reduce the temperature of the formation of a highly mobile melt and thereby activate 1f (sintering processes. In addition, the intensification of mineral formation does not require any special additives materials conventional methods of separate blending and heating of its components.

Example, Preparing a raw mix to form a pietland-cement blade; ra in the form of 2 parts.

The chemical composition of raw mixes is presented in table. one,

According to the invention, part of the 1st raw mixture is heated to 1000 ° C and held at a temperature of 30 minutes, part of the 2nd raw mixture is heated to a temperature of 1150 C and held for 30 minutes.

After grinding, both parts of the mixture are mixed in a ratio, wt.%: 1 part of 5O. The mixture obtained is calcined at temperatures of jth; 1250 C, 13OOs, 1350 ° C and

1400.C with a stand at a given temperature of 30 minutes, then cooled in air.

The test results are presented in Table. 2

The test results presented in table. 2 show that the proposed method makes it possible to obtain cement clinker at a temperature of 135 ° C from natural raw materials.

A decrease in the sintering temperature of the clinker leads to an increase in the productivity of the rotary kiln with a dry production method by 10-12%, while the consumption of the fuel decreases by 10-11%. Table 1

table 2

Claims (3)

Claim The method of obtaining Portland cement clinker by firing a heat-treated raw mix of the composition, wt.%: CaO 51.70-80, 35; 0 ^ 12.50-30.50; “Ae ₂ 0 ₃ 3.00-11.0; F e ₂ 0 _g 2.20-7.00, olt. The result is that, in order to intensify the firing process, part of the mixture with the composition is subjected to heat treatment at 1000-1250 ° C: CaO — 45.00-59.90; Oz. 4.05-10.55; And VTs. About _Z 0,10-5,97; F 0 _e 0.61-3.03 in an amount of 50-80%, and at 1000-1200 ° C. The remaining mixture of the composition: CaO 6.70-20.45; S-fO ^ 8.45-. 19.95, AP ^ O-j - 2.90-5.03; Pe-jO ^ 1.59-3.97 in an amount of 20-50%, followed by their mixing and firing at 1300-1350 ° C.