SU808421A1 - Raw mixture for producing cement clinker - Google Patents

Description

The invention relates to the industry of building materials, in particular to the technology of producing a blade with the use of associated products of complex processing of aluminum-containing material. The known raw mix for the production of cement clinker, including nepheline-belite sludge, carbonate rock, bauxite and cinder 1. The disadvantage of this raw mix is the increased consumption (4.5-8.5% of the scarce expensive bauxite, which negatively affects the cost of the clinker of the Volkhovsky mine of the mini-fab plant and the Pikalevo combine. The most close to the proposed is raw mix 2, including nepheline -white sludge, carbonic breed and corrective additive, for example, pyritic cinder with the following ratio of components, wt.%: Pethelino-belite slime 30-80 Carbonate breed 20-60 Corrective additive 0.01-1 Disadvantages of known cheese This mixture is a significant tendency of the raw material sludge to be stratified and precipitated due to the coarse-grained particle size distribution of the nepheline sludge residue on a sieve with a 0.08 mm opening of 78-90%, increasing the specific electric power consumption for grinding the raw mix in 14.6 kWh / t due to poor grindability of ifeelino-belite isham (increased microhardness of dicalcium silicate crystals) and reduced mechanical strength of the cement. In addition, clinker, the polite aty on the basis of a known raw material mixture, is characterized by a low alumina modulus (0.4-0.9), an insignificant amount of tricalcium aluminate (0.3-3.0%) and can be used for the production of non-general construction , but only special ferrous cements. The purpose of the invention is to increase the strength and reduce the energy consumption for grinding the raw mix. The goal is achieved by the fact that the raw mix for the production of cement clinker, including carbonate component, bleaches containing component and corrective iron-containing additive, contains as a bleaching component slag-belite slime in the following ratio of components, wt.%:. Corrective Additive 2-1-6 Slag-belite sludge 28-70 Carbonate component Remaining Slag-belite sludge / obtained as a waste from the processing of gelling domain slags for alumina / used in this mixture differs from nepheline-belite sludge by chemical-mineralogical and dispersible compositions

According to X-ray, petrograph, and phase analyzes, helenitic slag-belite sludge (finely dispersed isotropic material will contain 40-55% C2S in the p-form. Aluminates and calcium ferrite in a partially hydrated state, calcium carbonates from 1.3 to 23%. Sludge specific surface 4000-90QO-. Slag-belite slurry contains: high alumina content 2.8-11, .0% -, 1.5-3.5%; CaO 40.0-54, P %; Mor 6,012, 0%; CaF 1.0-2.5%; 5Сз 0-о, 5%; SiOj 20.0-27.0%, alumina module 1.6-3.6. As a corrective additive iron content can be used containing material with: GedOz 35.0-78.0%; 2.0-7.0%; SiOi 7.0-37.0%; SeO 0.2-3.0%; 50z 0.01-10 , 0%.

Known nepheline-belite sludge mainly contains: 85% С „5 in the form, alumina 2.2-2.8%; Fen O 2.4-3.8%, - CaO 55, 0-58, 0% / S i O and 29, 032, 0; MDO 1.5-2.5%; SO-j 0.2-0.45%; alumina modulus 0.7-0.95.

The introduction of slag-belite sludge makes it possible to improve the chemical and mineralogical composition of clinker, to increase the sedimentation stability of the sludge due to the finely dispersed granulometric composition of the sludge and to reduce

 () the specific consumption of electricity for grinding the proposed raw mix for. the expense of the fine granulometric composition of the sludge, as well as improving the quality of the cement produced by about 30-60% both in the initial (3-7 days) and subsequent (28 days) terms of hardening l / 13%.

Example. Slag-belite isham, obtained from the processing of gelenitic blast furnace slag to alumina, is metered in the required amount into the raw mill, where it is fed an average i 5 samples known to the Keregetas deposit, and iron-containing material as a corrective additive. After grinding and adjusting the saturation coefficient and alumina module, the raw meal is fed to a rotary kiln.

For comparison, raw mixtures based on nepheline-belite sludge from the Pikelev Combine Alumina are prepared.

The table presents the results of semi-industrial testing.

The table shows that the use of the proposed raw mix allows to improve the chemical and mineralogical composition of clinker, in particular, to increase the content of tricalcium silicate (CjA) from 0.3-3.0% to 5-9%, to reduce the specific power consumption by about 10% when grinding in a laboratory standard two-chamber mill, in addition to this quality, (strength) of cement will increase by 30-60% in the first (3-7 days), and in subsequent (28 days) curing times - by about 13%.

0, 0114.0 nyy 20 514.6 1015.5 Offered 211, 6 my 28 912.8 1613.8 0.9 3,0198288438 0.84 1,0154265415 0.44 0.3126180348 1.5 9275360489 1.2 6210345450 1.05204289436

the invention

Formula

Raw mix for cement clinker, including carbonate component, whites the component and corrective iron-containing additive, characterized in that, in order to increase the strength and reduce the energy consumption for grinding the raw mix, it contains slag-belite slurry with the following ratio of components ,weight.%:

Corrective iron-containing additive2-16 Slag-belite sludge28-70 Carbonate componentOther

Sources of information taken into account in the examination

1. Sychev M. M and others. Complex processing of nepheline sludge. Metallurgists, 1974, pp.51-55.

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2. Authors certificate of the USSR 327800, cl. G04 B, 7/35, 1970.

Claims (2)

The raw material mixture for producing cement clinker, including a carbonate component, a white-containing component and a corrective iron-containing additive, characterized in that, in order to increase strength and reduce energy consumption for grinding the raw material mixture, it contains Iron Corrective Additive Slag-Belite Slurry Carbonate Component 2-16 28-70 The rest as a whitish-containing component is slag-belite slurry with the following ratio of components, wt.%: