RU2322417C1 - Raw material mix for production of portland cement clinker - Google Patents

Abstract

FIELD: manufacture of building materials; production of portland cement.

SUBSTANCE: proposed raw material mix contains carbonate component, alumo-silicate component and waste of steel smelting process - electric steel smelting slag, mass-%: Al₂O₃, 2-8; CaO, 33-43; SiO₂, 20-30; Fe₂O₃, 13-25; the remainder being other components at the following ratio, mass-%: alumo-silicate component, 15-18; electric steel smelting slag, 10-30; the remainder being carbonate component.

EFFECT: economical efficiency.

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Description

The invention relates to the field of building materials and may find application in the production of Portland cement.

A known raw material mixture for producing sulfoferrite cement clinker, including a carbonate component, a glandular component, a gypsum-containing component and fuel ash from burning coal or brown coal (see RF patent No. 2151753, microliter С04В 7/02, publ. 2000) .

Also known is the raw material mixture adopted for the prototype for the preparation of Portland cement clinker, consisting of carbonate, aluminosilicate components and steelmaking waste in the form of open-hearth furnace dust and converter furnaces (see USSR author's certificate No. 381626, mcl C. 04B 7/02, publ. 1973 g.).

A disadvantage of the known solutions is a small amount of recyclable production waste; waste from electric steel production cannot be used.

The objective of the invention is the creation of a raw material mixture that provides cost-effective production of high-quality Portland cement clinker with a small number of components and proven technology using waste from electric steel production.

The objective is achieved in that the raw material mixture for producing Portland cement clinker, including a carbonate component, an aluminosilicate component, steelmaking waste, contains steelmaking slag of the composition, wt.%: Al ₂ O ₃ 2-8; CaO 33-43; SiO ₂ 20-30; Fe ₂ O ₃ 13-25; others - the rest, with the following ratio of components in wt.%:

Aluminosilicate component 15-18 Electric Steel Slag 10-30 Carbonate component rest

The use of electric steelmaking slag for the production of Portland cement clinker is known (see article Klassen V.K., Tekucheva E.V., Tynnikov I.M. et al. Dependence of clinker activity on the amount of metallurgical slag supplied to the cement rotary kiln from the cold end // XXI All-Russian Meeting of Heads of Plant Laboratories of Cement Plants. - M.: Education Information, 2005. - p.188-195). However, it is recommended to use it in an amount of 10-12% of all components. With an increase in the amount of slag, clinker quality decreases. To obtain the clinker specified in the article, in addition to the components of the claimed composition, an iron-containing component in the form of blast furnace dust or pyrite cinder is also used.

The introduction of electric steelmaking slag makes it possible to reduce the amount of raw materials with carbonate and aluminosilicate components, which allows, using local waste, to reduce the cost of cement production. Studies have shown that electric steelmaking slag in the inventive composition and ratio of components can replace the iron-containing component without reducing clinker activity. The use of electric steelmaking slag of the claimed composition as an iron-containing additive to obtain Portland cement clinker is not known from the prior art.

An example embodiment of the invention.

In the raw material mixture, the carbonate component is represented by chalk of the Stoilensky mining and processing plant, aluminosilicate - by clay of the Latnensky deposit and bauxites of the North-Onega bauxite mine, electric steel-smelting slag - by the slag of the Oskol electrometallurgical plant (OEMK). The technology for clinker and cement is traditional.

The compositions of the raw mixes and their strength characteristics are given in the table.

Composition number The composition of the raw mixes, wt.% Compressive strength, MPa carbonate component aluminosilicate component electric steel slag * 3 days 7 days 28 days one 72 eighteen 10 30.5 41.2 54.1 2 64 16 twenty 30.7 44.0 54.8 3 55 fifteen thirty 30,2 42.1 53,4 Portland cement brand 500 30,2 40.6 53,2 * Use slag composition: in example No. 1 Al ₂ O ₃ - 2, CaO - 43, SiO ₂ - 30, Fe ₂ O ₃ -15, others - 10, in example No. 2 Al ₂ O ₃ - 5, CaO - 43 , SiO ₂ - 20, Fe ₂ O ₃ - 25, others - 7, in example No. 3 Al ₂ O ₃ - 8, CaO - 33, SiO ₂ - 30, Fe ₂ O ₃ - 25, others - 4.

Strength characteristics are compared with standard Portland cement. The characteristics of the prototype in the source of information is not given.

As follows from the table, cement obtained using electric steelmaking slag from clinker of the specified composition has a strength characteristic at the level of standard Portland cement produced by the Oskolcement cement plant, clinker of which is obtained from a raw material mixture comprising: aluminosilicate component, carbonate component, iron-containing additive in the form of blast furnace dust or pyrite cinder.

The raw mix of the claimed composition provides an economical production of high-quality Portland cement clinker with a small number of components and proven technology using waste from electric steel production.

Claims (1)

The raw material mixture for producing Portland cement clinker, including a carbonate component, an aluminosilicate component, steelmaking waste, characterized in that it contains electric steelmaking slag composition, wt.%: Al ₂ O ₃ 2-8; CaO 33-43; SiO ₂ 20-30; Fe ₂ O ₃ 13-25; others - the rest, in the following ratio of components, wt.%: aluminosilicate component 15-18; electric smelting slag 10-30; carbonate component - the rest.