SU759478A1 - Raw mixture for producing portlandcement clinker - Google Patents

Description

The invention relates to the production of binding materials, in particular to the composition of raw materials for the production of portland cement clinker, and can be used in the industry of building materials.

The compositions of raw mixes for obtaining Portland cement clinker are known, including lime and clay components, corrective additives and containing phosphogypsum O as a mineralizer.

The disadvantages of this mixture are the low speed of clinker-forming processes, the appearance of clinker 15 dusting and reduced cement strength.

Also known is the raw mix for obtaining Portland cement clinker, comprising 65-80 wt.% Lime-20 and 13-20 wt.% Clay components, 2-5 wt.% Corrective additives and 5-15 wt.% Mineralizer, consisting of phosphogypsum and electrostatic dust rotating rotary kilns at a ratio of from 0.5: 5 to 2: 1 [2]. This raw mix is the closest to the invention to the technical essence and the achieved effect. thirty

The disadvantages of the known raw material mixture are the low speed of the processes of clinker formation and reduced cement strength. '

The purpose of the invention is to intensify the processes of clinker formation and increase the strength of cement.

This goal is achieved by the fact that in the raw mix for obtaining Portland cement clinker containing limestone and clay components, a corrective additive, a mineralizer that includes phosphogypsum and electrostatic dust of rotary kilns, the mineralizer also contains dolomite flour at a ratio of phosphogypsum, electrostatic dust of rotary kilns and dolomite flour from 1: 8: 1 to 1:20:10 in the following ratio of components, wt.%:

Limestone component 22-32

Clay component 55-65

Corrective additive 1.5-3

Mineralizer 10-20

Using as a mineralizer a mixture of phosphogypsum, dust electrostatic precipitators of rotary kilns and dolomite flour in the indicated ratios allows to intensify the reactions of plant 759478

“RESULTS and crystallization of minerals from the melt and thereby the processes of clinker formation as a whole due to the increased electrical conductivity of the clinker liquid phase 1.5-2 times. As a result of the high mobility increases the amount of calcium cation and reduced different steps ^e crystals of tricalcium silicate 'of clinker, resulting in an increased strength of the resulting cement therefrom. When the specified limits are exceeded, interlayers of the melt of the sulphate-alkaline composition are formed in the sintered clinker grains, which, being forced out onto the surface of the clinker fluid, isolate the reacting solid phases from it. As a result, the rate of clinker formation processes decreases, as well as the strength characteristics of cements based on clinkers synthesized under the same conditions. 20

. PRI me R 1. From raw materials a wet method is used to prepare the raw material mixture at the following components, wt%:

Limestone component Clay component '

Corrective additive Mineralizer

The mineralizer contains phosphogypsum, dust and dolomite flour at a ratio of 1: 8: 1.

After drying the sludge to a residual moisture content of 5%, the raw material mixture is briquetted at a specific pressure of 400 kgf / day. 5 The obtained cylinders with a diameter and height of 20 mm are subjected to preliminary heat treatment at 900 ° C for 1 h to completely decompose the carbonate components. Then the briquettes are burned at 1400 ° C with isothermal aging for 10, 15 and 20 minutes. The rate of clinker formation is determined by the amount of undigested calcium oxide in the synthesized specs.

In tab. 1 is given the chemical composition of the raw materials used.

PRI mme R 2. Prepare raw

mixture containing, wt.%:

Limestone component 26 Clay component 57 Corrective additive 2 Mineralizer 15

The mineralizer contains phosphogypsum, dust and dolomite flour at a ratio of 1: 14: 4.

This raw material mixture is subjected to the same tests as the mixture in the example. one .

Example From raw materials prepare the raw material composition, wt.%:

Limestone component ‘22 Clay component 65.

Corrective additive 3

Mineralizer 10

The mineralizer contains phosphogypsum,

dust and dolomite flour at a ratio of 1:20:10.

The mixture is subjected to the same tests as in example 1, ’

Example 4. Prepare raw

ratio 23.5

55

1.5

20

25

a mixture of composition, wt.%:

Limestone component 32 Clay component 56 Corrective additive 2 Mineralizer 10

The mineralizer contains phosphogypsum, dust and dolomite flour at a ratio of 1: 15: 3.

The mixture is subjected to the same tests ^ as in example 1.

The test results of raw mixes, the compositions of which are given in examples 1-4, in comparison with the prototype are presented in table. 2,

The data in the table indicate a significant intensification of the processes of clinker formation, which makes it possible to obtain conditioned clinker with a significantly shorter (by 25%) firing time. This contributes to an increase in kiln performance and lower fuel consumption during the synthesis of klinkers. Cements obtained from the clinkers of the proposed composition are characterized by increased strength at all test periods.

Table 1

Components 5! 0 _g | αι _ζ ο ₃ Composition, wt.% \ ₂ 0 | ppt | ^Re g ° s | sao 7¾ | MDO | Ea ₂ 0 Limestone 3.25 0.91 0.37 51.84 0.06 1.00 - 41.92 Clayey 16,56 4.68 2.07 39.05 0.10 2.00 - 33.76 Corrective additive 10.58 4.86 72.97 7.50 7.50 - - Dust 13.00 3.84 2.11 40.50 5.40 1.40 1.75 6.55 24.63 Phosphogypsum 0.72 0.22 0.30 36.20 50.30 0.21 0.10 - - Dolomite flour 5.43 2.55 0.93 38.92 0.15 10.72 - -. 41.30

five

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table 2

Mix by Example Content of CaO _s ^ (%) in clinkers obtained at 1400 ° С with a holding, min The compressive strength of cement (kg / cm ^g ) through the day 10 | - one 20 ' one 28 one 0.98 0.85 ' ABOUT * h · - 344 405 535 2 1.05 0.62 0.2 357 410 548 3 1.16 0.93 0.5 347 396 528 four 1.19 0.76 0.4 350 408 542 Prototype 1.46 1.14 0.81 323 387 503

Claims (1)

Claim The raw mix for obtaining portland-20 cement clinker, containing limestone and clay components, a corrective additive and a mineralizer including phosphogypsum and dust of electric filters of rotary kilns, 2 ”, which in addition to dolomite flour at the ratio of phosphogypsum, dust electrostatic precipitators rotary kilns and dolomite flour from 1: 8: 1 to 1:20:10 in the following ratio of components, weight. %: Limestone component 22-32 Clay component 55-65 Corrective additive 1.5-3 Mineralizer 10-20