SU1608155A1 - Initial composition for producing white cement clinker - Google Patents

Abstract

The invention relates to the building materials industry, primarily to raw mixes for the production of cement clinker. The aim of the invention is to increase the compressive strength and lower the firing temperature. The proposed raw material mixture for the production of cement clinker contains, wt%: open-hearth slag 5.7-8.7

Tripoli 6.0-11.0

abrasive slurry bearing production 3.0-5.0

chalk the rest. The firing temperature is 1370-1380 ° C

compressive strength 60.3-61.3 MPA. 3 tab.

Description

The invention relates to the construction materials industry, mainly to the composition of raw materials for the production of cement clinker.

The purpose of the invention is to increase the compressive strength and reduce the firing temperature.

Waste bearing production is abrasive slurry. The sludge composition is heterogeneous and contains 55-60% metal, 22-26% cooling lubricant and 18-22% abrasive. The chemical composition of the metal SH 15 contains, wt%:

C1.32-2.65

0 / i1.32-3.46

S0,57-1,27

Mp0.25-0.31

Si0.24-0.48

S0.064-0.076

RM less than 0.03

Fe Else

The chemical composition in oxide terms of all components is presented in table. one.

But the granulometric composition of abrasive gsam consists of particles,%: 0-0.12 mm 48.0-60 0.2-1.00 mm 20.0-29.9 Less than 1.0 mm Else After heat treatment at 600-800 С within 30 minutes the sludge has a chemical composition, wt.%:

05

About 00

ate

Fe ,, 0 3, SiOa.

SG2.0z

Tio. Fe

MnO

25.00-80.00 15.00-17.00 1.00-2.00 0.60-1.20 0.10-0.20 4.00-10.00 0.40-1.11

This makes it possible to reduce the content of metallic iron and thereby regulate the content of iron oxides in the resulting clinkers. Abrasive slurry is used to reduce the (1) coefficient of thermal expansion and increase heat resistance. but it has no practical use. The open-hearth slag is a waste of steel production. The use of slag as a component for the production of cement clinker is known to reduce the calcining temperature from 1450-1500 to 1400-1450 ° C. The combined use of abrasive slurry and open-hearth slag is unknown. Chalk, used in the raw mix, and tripoli correspond to GOST.

The raw material mixture is prepared by the joint, local grinding of the mixture, its granules 1), and with subsequent burning in an electric furnace. I Example 1. For preparation (the batch injected into the mill 3 wt.% Of the waste production of bearings, pre-heat-treated at 600 s for 30 minutes, 5.7 wt.% Ground open-hearth slag, 85.30 wt.% Chalk and 6 wt.% Tripoli, ground to a residue on a 008 sieve, no more than 6-8%. Next, the ground mixture is poured with water to a moisture content of 15% and granulated in a granulator, after which it is sent for firing. The firing is performed in an electric furnace. sharply cooled in air and grind to a residue on a sieve 008 8.0%.

Testing of cement clinker for physical and mechanical properties is carried out in accordance with GOST. Other examples are made analogously to example 1 with a certain variation of the ingredients and are given in table 2.

In order to study the effect of joint use in the composition of the blend of open-hearth slag and heat-treated abrasive sludge, the process of assimilation of CaO in the case of ob-: The granules are calcined at 1000-1350 C for 30 minutes. The CaO content is determined by the ethylo-glycerate method. The results and compositions of the mixtures are given in Table 3.

The chemical composition of the obtained clinkers without preliminary thermal analysis

five

0

five

0

five

0

five

0

five

processing of abrasive sludge next,, wt.% g SaP 62-63; , 9.5-13; ACO, 3.4-3.7; SiOz 20.1-21.3; TiO 0.3-0.5; MnO 0.6-0.67; , 0.23-0.29; Fe 0.02-0.11, which corresponds to the calculation, wt.%: CjS 65-74; 1-6.6, calcium alumina-ferrites 16-18 .; ferrite qi 6-7.3. When using heat-treated abrasive sludge, the obtained clinkers have a chemical composition, wt.%: CaO 62-65; Fe2.0% 3.0- 4.6; 2.4-3.5; SiOz 21-22; TiO 0.3-0.6; MnO 0.5-0.6; 0.2-0.25. Thus, the proposed raw material mixture allows to reduce the firing temperature by 50-80 ° C, increase the tensile strength by 20-35% and, in addition, the open-hearth slag under investigation is not decisive in the process of clinker formation and it does to increase strength. Heating the abrasive slurry below provides a degree of oxidation of metallic iron by 80-87%, which leads to an increase in the content of the resulting clinkers. An increase in temperature above 800 ° C is impractical, since the oxidation state of metallic iron already reaches 99.5% at.

Claims (1)

Invention Formula The raw mix for producing cement clinker, including carbonate-containing, aluminum-containing, silica-containing (i and iron-containing components, characterized in that, in order to increase compressive strength and reduce the burning temperature, it contains chalk, aluminum-containing - and - or - containing roasting temperature, a chalk-containing alumina-containing -, - to reduce the firing temperature, carbon containing, chalk, alumina-containing -, - and - silica slag - tripoli and iron containing slag - abrasive psham bearing production, previously heat-treated at 600-800 s for 30 min, with the following ratio of ntov, may.%: Open-hearth slag Tripoli Abrasive bearing production 3.0-5.0 Small Else 5.7-8.7 6.0-11.0 table 2 Table 3