RU1822398C - Cement clinker raw mix and process for preparing the same - Google Patents

Abstract

The invention relates to the production of building materials, to the technology of cement clinker and may find application in the production of cement and products based on it. The inventive raw material mixture includes, by weight. o: dolomitic limestone, lignite-bauxite 3 42, wastes from enrichment of sulfide-magnetite. ore. The raw mix is prepared by co-grinding dolomitic limestone with sulphide-magnetite ore dressing wastes and then mixing them with preliminary lignite-bauxite. Advantageous effect: the composition and method of preparation of the raw mix provide a stable increase in the strength of cement stone and reduce the effect of extractive substances of wood on it. 2 s.p. Aly, 2 tablets next to

Description

The invention relates to the building materials industry, in particular to the technology of cement clinker, and may find application Ei in the production of cement and products based on it.

The closest in technical essence to the proposed object is a raw mixture for producing cement clinker, including, wt.%: Dolomitiziropan known to 47.0-51.0, lignite-bauxite 45-49.0, waste titanium-magnesium production 1, 5 and open rock of iron oxide basins based on silicon oxide 0.5-2.5.

A disadvantage of the known raw mix is the susceptibility of the finished cement to extractive

substances of wood, a decrease in the intensity of growth of the strength of cement stone or prolonged hardening.

The purpose of the invention is to reduce the effect of extractive substances of wood on the strength of cement stone, stabilizing its growth.

This goal is achieved in that the raw material mixture for producing cement clinker, including dolomitic limestone, lignite-bauxite, ferruginous and aluminosilicate components, contains, as ferrous and aluminosilicate components, the wastes of enrichment of sulfide-magnetofluid ores in the following ratio of components, May. :

Dolomitized

known for k53 - 57

SO Yu

Yu iCJ Yu 00

With

Litnite-bauxite 3 - 2 Sulfide-magnetite enrichment waste

RUD5-9

in this case, the raw material mixture is prepared by joint grinding of dolomitized limestone with wastes of enrichment of sulfide-magnetite ores and their subsequent mixing with

finely ground lignite bauxite. I

The chemical composition of the raw materials is given

in table 1.

We used dolomitic limestone of the Agapovsky deposit. Lignite-bauxite (Krasnookt Borskoe deposit) is a high-alumina rock, substandard for the aluminum industry due to the presence of lignite (low-angle wood). Sulphide-magnetite ore dressing waste is the tailings of the magnetic separation of ores from the Sokolovsko-Sarbaisky ore processing plant. The mineral base of the waste is formed, wt.%: Calcium silicates of aluminum, iron, magnesium 60-82, chlorites, calcite 5-8, magnetite 3-5, quartz 2-6, pyrite 2-10.

SUMMARY OF THE INVENTION

When firing the raw mix of the proposed chemical and mineral composition, a cement clinker is obtained containing, wt.%: CЈA4MS 54-60; C2S 13-15; 3 (CA) CaS04 10-8; MgO 3-5; ferrite phase 18-20 (represented mainly by multicomponent solid solutions). The presence of 3 (CA) Ca50 ,, the complicated composition of the Ferritic phase, a change in the fraction of other components of the obtained clinker distinguish it from the prototype. These changes in phase composition reduce the degree of negative effect of wood extractive substances on the strength characteristics of cement. Clinker phases of different hydration activity ensure a stable increase in the strength of cement stone during prolonged hardening. For these effects, a special preparation of the raw mix is necessary. The primary contact of dolomitized limestone with the waste from the enrichment of sulfide-magnetite py due to the close approximation of their particles favors the formation of CaCO3 (SO formed during pyrite oxidation reacts with CaO released after lime decarbonization), which forms in clinker 3 (CA) -CaSOy. The proposed method for preparing the raw material mixture accelerates the destruction of the crystal lattices of natural minerals, the formation of clinker phases. The uniform distribution of the fusible component (enrichment waste) in the mixture facilitates the mutual dissolution of the phases and the formation of solid solutions.

Example. Preparation of raw mixes. It is known that enrichment waste in a predetermined amount (Table 2) was jointly ground to a residue on a G 008 sieve, then the resulting mass was mixed with lignite-bauxite, previously ground to the same fineness. The mixture of example k was prepared by simultaneously mixing separately milled components.

Briquettes of raw mixes (D 30, N 10 mm) were fired in a silica electric furnace at 1270-1280 ° C. The firing mode is gradual, exothermic exposure 30 min. Speccom cooling in the air.

The resulting spices were crushed to a residue on a sieve G OOS - 2-52. Strength indicators of cements were determined on samples with a size of -10x10 60 mm prepared from a text of normal density (25-26%). D water and a solution of coniferous wood extract (concentration 0,) were used as a solder. A wood extract solution is used to simulate the effects of water-soluble substances released from wood aggregate in composite building materials (e.g. arbolite).

According to the table. 2 recognized the composition of the raw mixes in examples 1-3. In a clinker from a mixture with a lower content of sulfide-magnetite ore dressing waste (Example 5), the content of 3 (CA) -CaS04 is insignificant, which determines the increased exposure of cement to the effects of wood extractives. The same thing was noted in the preparation of the raw mix by mixing separately crushed components (example C). With an increase in the proportion of enrichment waste (Example 6), slightly hydraulic phases (CrA5 and DR.) Are formed in the clinker, which impair the strength properties of the cement.

The proposed composition and method of preparation of the raw mix allows

Claims (2)

1. The raw material mixture for the production of cement clinker, including dolomitized limestone, lignite side sieve, ferrous and siliceous components, characterized in that, in order to reduce the effect of wood extractive substances on the strength of cement stone and stabilize its growth, it contains, as a glandular and siliceous component, wastes from the sulphide-magnetite ore dressing in the following ratio of components, ma.e. and: 10 fifteen twenty 25 Lolomite known k53 - 57 Lignite-bauxite 3 Sulfide-magnetite ore dressing waste 5-9 2. A method of preparing a raw material mixture for producing cement clinker, comprising crushing dolomitic limestone, lignite-bauxite, ferruginous and siliceous components, characterized in that it has a chain to reduce the effect of extractive wood substances on the strength of cement stone and stability In view of growth, the dolomitized limestone is first crushed together with sulfide-magnetite ore dressing wastes, which are used as glandular and siliceous components, and then mixed with ritually ground lignite bauxite. T a 6 l and h z I table 2