RU2396435C1 - Composition of stowage mixture - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: invention refers to mining and can be implemented at development of mineral deposits with stowing mined space. Composition of stowage mixture containing milled granulated blast furnace slag, inert filler and water consists of the said acidic slag of fractions smaller, than 0.071 mm not less 90 wt %, as inert filler - wastes of concentration of wet magnet separation of ferrous quartzite containing fractions smaller, than 0.071 mm not less 90 wt %, additionally - super fluidising agent SP-1 at the following ratio of components, wt % said slag 22, said wastes 54.5, super fluidising agent SP-1 0.4 of slag contents, water - the rest.

EFFECT: raised strength, increased volumes of utilised anthropogenic wastes for considerable improvement of ecological medium.

1 ex, 2 tbl

Description

The invention relates to the mining industry and can be used in the development of mineral deposits with the laying of the developed space.

Known filling mixture, including cement, ground granulated blast furnace slag, aggregate and water in the following ratio of components, wt.%: Cement - 2; ground granulated blast furnace slag - 18.4; placeholder - 61.38; water is the rest [1].

The disadvantages of this mixture are the low ductility due to the insufficient content of the fine fraction, as well as the low strength of 3.0 MPa in 90 days of the constructed mass due to the use of aggregate with a tensile strength below the standard strength of the bookmark.

Closest to the proposed invention is the composition of the filling mixture, including cement, ground blast furnace granulated slag, inert aggregate and water. As an inert aggregate, this composition contains amorphous precipitates of neutralization of sulfuric acid by limestone, pre-treated with an aqueous solution of iron (III) sulfate Fe (OH) SO ₄ , in the following ratio of components, wt.%: Cement 4.0-6.8; ground blast furnace granulated slag 9.7-16.5; amorphous precipitation of neutralization of sulfuric acid with limestone 31.7-40.8; iron (III) hydroxosulfate 1.2-2.0; water - the rest [2].

The disadvantages of this composition are: the use as a binder of scarce material - cement and slag with a higher quality factor of 1.51 (table 1); multicomponent composition, complicating its preparation in industrial applications, as it will require the involvement of additional lines and operations to add each component; high water consumption requiring additional funds and equipment for drainage operations.

The objectives of the invention are: the exclusion of expensive cement and the use of slag of a lower grade with increasing strength;

reduction in the amount of water while maintaining the spreadability of the filling mixture;

reduction of the components of the mixture and increase in the volume of utilized industrial wastes to significantly improve the ecological environment of the region.

The problem is solved by the proposed composition of the filling mixture, which includes ground granulated blast furnace slag, binder, inert aggregate and water, and additionally contains a surface-active additive superplasticizer SP-1, and as an inert filler, waste enrichment of wet magnetic separation of ferruginous quartzite containing fractions less than 0.071 mm, not less than 90%, in addition, ground blast granulated acidic slag containing not less than 90% fractions of less than 0.071 mm is used as a binder, in the following ratio of components, wt.%:

blast furnace ground granulated acidic slag - 22;

enrichment waste of wet magnetic separation of ferruginous quartzites - 54.5;

superplasticizer SP-1 - 0.4 from the content of slag;

water is the rest.

Example. Granulated blast furnace slag was crushed in a ball mill to a particle size with a ratio of at least 90% of a class of less than 0.071, mixed with enrichment waste containing at least 90% of a fraction of less than 0.071 mm, and closed with water, to which SP-1 superplasticizer was previously added. The final mixture was mixed until a uniform consistency. Samples of 70 × 70 × 70 mm in size were prepared from the resulting mixture, which were kept in the climatic chamber for 2-3 days until the stripping strength of the samples was achieved. In the chamber, a temperature of 20 ± 20 ° С and a relative humidity of 90-95% were maintained, i.e. conditions close to the conditions of hardening of the array in the mine. After forming, the samples were again placed in a climatic chamber for further hardening for 90 days, after which the mechanical strength was determined using a hydraulic press. The following results were obtained: spreadability of the filling mixture - 165 mm, draft of the StroyTSNIL cone - 15 cm, mechanical strength - 7.0 MPa at the age of 90 days with a water content of 23.4%. Various formulations of filling mixtures were prepared and tested similarly.

Table 1 The chemical composition of blast furnace slag Quality Factor K CaO,% SiO ₂ ,% Al ₂ About ₃ ,% MgO,% MnO,% Other% Prototype 1.51 28.9 36.5 17.6 10.9 0.7 5.40 The claimed 1.23 40,4 42.7 5,4 6.7 0,026 4.78

Table 1 shows the chemical composition of blast furnace granulated slag, and in table 2 - the initial gross composition of the mixtures and the results of testing the mechanical strength of samples prepared from these mixtures.

Superplasticizer SP-1 based on the condensation product of naphthalene sulfonic acid and formaldehyde (sodium polynaphthalene methylene sulfonate or methylenebis (naphthalene sulfonate)) is produced according to TU 5870-005-58042865-05.

The hydraulic properties of blast furnace slag are evaluated according to GOST 3476-74 quality factor K, which is determined by the formulas:

with a content of magnesium oxide up to 10%

when the content of magnesium oxide is more than 10%:

For 1 grade K = 1.65, 2 grades K = 1.45, 3 grades - 1.2.

From table 2 it follows that the task is to increase the mechanical strength of the filling mixtures according to the prototype (4.35 MPa), reduce the volume of water while maintaining the consistency of the mixture suitable for transportation, is achieved by adding plasticizer SP-1 and provided that the fraction is less than 0.071 mm ,% in enrichment waste and ground blast furnace granulated slag not less than 90%.

Using the proposed technical solution completely eliminates the consumption of expensive cement for filling operations, and also allows to provide high technological properties of filling mixtures - spreadability and standard strength while reducing the volume of water, replacing slag with a lower grade, reduce the number of components of the mixture and increase the volume of utilized industrial waste for significant improving the ecological environment of the region.

Information sources

1. L.K. Vakhrushev, E.M. Denisov, K.Yu. Repp. The use of dump blast furnace slag for the preparation of a knitting filling mixture. Mountain Journal, 1979, No. 1, p. 39.

2. RF patent No. 2186989, published on 08/10/2002.

Claims (1)

The composition of the filling mixture, including ground granular blast furnace slag, an inert aggregate and water, characterized in that it contains the specified acidic slag containing fractions of less than 0.071 mm of at least 90 wt.%, As an inert filler - waste enrichment wet magnetic separation of ferruginous quartzite containing fractions less than 0.071 mm not less than 90 wt.%, additionally - superplasticizer SP-1, in the following ratio of components, wt.%:
specified slag 22 specified waste 54.5 superplasticizer SP-1 0.4 of the content of slag water rest