SU1673560A1 - Mixture for stowing used-up workings - Google Patents

Abstract

The invention relates to the mining industry and can be used in the underground mining of mineral deposits with the laying of the goaf. The aim of the invention is to ensure the normative strength of the backfill array at the age of up to 60 days and the reduction of consumption in the perpetrators. The goal is achieved by the fact that the filling mixture for filling mine workings contains, in wt%: ground granulated slag 11.47 - 20.54

portland cement 0,22 - 1,83

inert aggregate 54.79 - 64.27

ground limestone to 1.37 - 4.18, water - the rest. The strength of the filling mass is 3.5–5.0 MPa at the age of 60 days with a decrease in the consumption of portland cement by 60–80%.

Description

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WITH

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

The purpose of the invention is to ensure the regulatory strength of the backfill array at the age of up to 60 days and the reduction of consumption in the sting - blast furnace granulated slag and Portland cement.

The stowing mixture contains blast-furnace granulated slag, Portland cement, inert aggregate, water, and ground limestone in the following ratio of components, wt%;

Ground blast

granulated slag 11,47-20,54

Portland Cement 0.22-1.83

Inert aggregate 54,79-64,27 Ground limestone k1,37-4,13

WaterEverything

Under laboratory conditions, five sets of backfill mixtures with a mobility of 11.4-11.7 cm immersion cone StroyCNIIL were tested. Each series included five compositions in which, with a stepwise reduction in the consumption of granulated slag from the blast furnace, the design consumption of portland cement was 60, 70, 80 and 90% offset by the addition of ground lime.

Example. The design consumption of portland cement, which is 1.20% for series I (50 kg / m5), was replaced by 60 (30 kg), 70 (35 kg), 80 (40 kg) and 90 (45 kg) ground limestone. In the II-V series of consumption of portland cement

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55.60.80 and 100 kg / m3 of tabs were given respectively.

Properties of the components of the filling mixture.

1. Domain granulated slag, crushed in a ball mill to a surface of 3000 + 200 cm2 / g, is characterized by the following chemical composition, wt%: SI0231.0; A 20z24.0; Ca037.4; MDO 4.1; MpOO, 4; REAOZZ ,. Modular slag characteristics: M0sn - 0.76; MWT - 0.77.

2. Guaranteed Portland cement brand 400.

3.80% ground limestone of a size of 0.074 mm.

4. Inner aggregate contains 8.8% of powdered clay, clay particles, density 1.9 g / cm3, bulk volume 1.1 t / m3.

The granulometric composition of the inert aggregate is given in table. one.

The preparation of compositions of the filling mixture with different contents of the starting components is carried out as follows.

Pre-dosed blast-furnace granulated slag, portland cement and lime are thoroughly mixed in dry form, then an appropriate amount of aggregate is added and the starting components are mixed again for 5 minutes. The flow of water in the mixture is regulated by the size of the StroyTsNIIL cone immersion in the range of 11.4-11.7 cm. For

Samples are fabricated using metal molds - cubes with a ribs size of 7.07 cm. Until the curing period has expired, the samples are stored in a moist environment. The strength of the samples for uniaxial compression is determined on a 10-ton PSU-10 press.

The ratio of the components of the studied compositions of the filling mixture and the results of testing samples for uniaxial compression are given in table. 2

From the data table. 2 that the optimal recipes correspond to filling mixtures with an 80% replacement of the design consumption of portland cement with ground limestone.

Claims (1)

Invention Formula Sealing mixture for filling the mine workings, containing ground granulated slag, portland cement, inert aggregate and water, characterized in that, in order to ensure the normative strength of the filling mass in the age of 60 days and reduce the consumption in the procession, the mixture additionally contains ground known to the following ratio of components, wt.%: Ground granulated slag Portland cement Inert aggregate Ground limestone to Water Table 1 11.47 0.45 .I3J4.27, 9.65 21.42 HjstcTHi bookmark mixture 2.38 5.14 11.6 26.50 17.43 5.1419.04 10.2 40.00