RU2445464C1 - Stowing mix - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: stowing mix, containing crushed granulated blast-furnace slag, an inert filler, water and ground limestone, includes the specified acid slag of III grade, containing particles of less than 3 mcm - at least 13%, the specified limestone, containing particles of less than 3 mcm - 45%, the inert filler is represented by rock refuse from wet magnetic separation of ferruginous quartzites and additionally - a superplasticiser SP-1, at the following ratio of components, wt %: specified slag - 12; specified filler - 60; specified limestone - 10; superplasticiser SP-1 - 0.5 of slag content; water - balance.

EFFECT: reduced consumption of binders, higher strength of massif at the age of 28 days, wastes recycling, reduced contamination of environment.

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 sand and water in the following ratio of components, wt.%: Cement - 1.4-2; ground granulated blast furnace slag - 18.8-19.9; placeholder - 62.8-63; water - the rest [1].

The disadvantages of this mixture are low strength (4.5 MPa at the age of 180 days), the use of cement and natural aggregate.

Known filling mixture, including cement, ground granulated blast furnace slag, aggregate - ground diabase, crushed straw and water in the following ratio of components, wt.%: Cement - 2,9-5,07; ground granulated blast furnace slag - 15.21-16.91; placeholder - 52.24-53.22; water - the rest [2].

The disadvantages of this mixture are also low strength (5.12 MPa at the age of 180 days) and the use of cement.

The closest to the invention is the composition of the filling mixture, including Portland cement, ground blast furnace granulated slag, inert aggregate, water and ground limestone, containing 80% of the particle size class 0,074 mm (74 μm). Inert aggregate contains 8.8% of dusty clay and silty particles, density 1.9 g / cm ³ [3].

The disadvantages of this composition are the use of a deficient binder material - cement and slag with a high quality factor of 2.1 (Table 1), low strength (2.8 MPa at the age of 28 days).

The task of the invention is the elimination of Portland cement and the use of slag of a lower grade, increasing the strength of the filling array and increasing the volume of utilized industrial waste to significantly improve the ecological environment of the region.

To solve this problem, a filling mixture has been proposed, including ground granulated blast furnace slag, an inert aggregate, water and ground limestone, which contains the specified acidic slag grade III containing particles of less than 3 μm of at least 13%, said limestone containing particles of less than 3 μm - 45 %, as an inert filler - waste enrichment wet magnetic separation of ferruginous quartzite and optionally superplasticizer SP-1, with the following ratio of components, wt.%: the specified slag - 12; specified placeholder - 60; specified limestone - 10; superplasticizer SP-1 - 0.5 of the content of slag; water is the rest.

The technical result is a reduction in the consumption of binders, an increase in the strength of the massif not lower than the standard (5 MPa) at the age of 28 days, utilization of waste from hydrometallurgical production, substandard limestone and waste from the enrichment of ferruginous quartzite, and reduction of environmental pollution.

Example.

Granular blast furnace acidic slag of the III grade, crushed to the content of particles: less than 1 micron - 4.3%; less than 3 microns - 12.6%; less than 5 microns - 17.2%, mixed with waste enrichment wet magnetic separation of ferruginous quartzites containing particles: less than 1 micron - 3.4%; less than 3 microns - 12.6%; less than 5 microns - 17.2%, and limestone, crushed to a particle content of less than 1 micron - 13.92%; less than 3 microns - 44.68%; less than 5 microns - 56.85%, and closed with water, to which the superplasticizer SP-1 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. The samples 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 28-90 days, after which the mechanical strength was determined using a hydraulic press. The following results were obtained: the draft of the StroyTsNIL cone was 11.5 cm, the mechanical strength was 8.8 MPa at the age of 28 days and 13.4 MPa at the age of 90 days with a slag content of 12% and water of 17.94%.

In the prototype, with a cement content of 0.22%, slag of 20.54% and water of 22.37%, mechanical strength is 2.8 MPa at the age of 28 days and 5.4 MPa at the age of 60 days, the sediment cone "StroyTSNIL" - 11, 5 cm

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.

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%

% CaO +% Al ₂ O ₃ + MgO

% SiO ₂ +% TiO ₂

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

% CaO +% Al ₂ O ₃ +10

% SiO ₂ +% TiO ₂ +% (MgO-10)

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

Table 1 The chemical composition of blast furnace slag Quality factor, K CaO,% SiO ₂ ,% Al ₂ O ₃ ,% MgO,% MnO,% Other% Prototype 2.1 37,4 31,0 24.0 4.1 0.4 3,1 The inventive composition 1.23 40,4 42.7 5,4 6.7 0,026 4.78

From table 2 it follows that the task of increasing the mechanical strength of the filling mixtures according to the prototype (2.8 MPa) is not lower than the normative at the age of 28 days while maintaining the consistency of the mixture suitable for transportation, is achieved by adding plasticizer SP-1, provided that the particle content is less than 1 micron in ground limestone at least 13.9%.

The use of the proposed technical solution completely eliminates the consumption of expensive cement for filling operations, and also ensures high technological properties of filling mixtures - mobility and standard strength under the age of 28 days with a decrease in water volume, replacement of slag with a lower grade and increase the volume of utilized industrial waste for significant improving the ecological environment of the region.

1. A.L. Trebukov. The use of hardening bookmarks in underground ore mining. - M .: Nedra, 1981, p.31.

2. RF patent No. 2270921, published February 27, 2006.

3. A.S. No. 673560, published 08/30/1991

Claims (1)

The filling mixture, including ground granulated blast furnace slag, an inert aggregate, water and ground limestone, characterized in that it contains the specified acidic slag grade III containing particles of less than 3 μm of at least 13%, the specified limestone containing particles of less than 3 μm - 45%, as an inert filler - waste enrichment wet magnetic separation of ferruginous quartzite and additionally - superplasticizer SP-1 in the following ratio of components, wt.%:
Specified Slag 12 Specified Placeholder 60 Indicated Limestone 10 Superplasticizer SP-1 0.5 of the content of slag Water Rest