SU909213A1 - Composition for preventing endogenous fires - Google Patents

Description

(5) COMPOSITION FOR THE PREVENTION OF ENDOGENOUS FIRE

one

The invention relates to mining and can be used to prevent endogenous fires in the conditions of underground mining of deposits of combustible minerals.

It is known to use clay pulp of various consistency for the prevention of endogenous fires. The clay solution - pulp tampon voids in the collapsed rocks, cracks in the coal pieces and, covering the pieces of coal with the film, protects it from GI oxidation.

-one

The use of clay pulp for the prevention of endogenous fires in underground mining of fossil fuels has a number of drawbacks. Due to the weak adhesion to the coal surface and the long-term retention of fluidity and plasticity without curing under wet conditions, the pulp from clay does not form a sufficiently strong film on the pieces of coal;

exposure of coal with its subsequent oxidation. .

Closest to the proposed facility is a composition containing clay slurry, power plant ash, lime or gypsum, ground asbestos and Portland cement 2.

The introduction of additives increases viscosity, stability, and water loss of clay pulp, reduces its sludge,

10, but slightly speeds up the setting and hardening of the clay slurry and, thus, slightly reduces the oxidability of the coal.

15

A more reliable protection of coal against oxidation can be achieved by forming on the surface of coal particles, especially a freshly exposed, sufficiently strong film with its hardening in a shorter time.

The purpose of the invention is to increase the effectiveness of the prevention of endogenous fires by reducing the oxidizable g and

390921

coal and increase the cure rate of the composition.

This goal is achieved by the fact that the composition additionally contains liquid glass and ground granulated blast furnace slag in the following ratio of components, wt.%:

Clay11,2-16

Portland cement 1-2 Liquid glass 1.3-2.5 O Ground granulated blast-furnace slag 2, WaterEstal

Introduction of liquid glass and ground 15 granulated blast furnace slag to the clay-cement slurry increases the adhesion of the pulp to the coal surface, accelerates its curing, tampons pores and cracks, creates a durable film on the surface of the treated coal, since Portland cement, liquid glass and ground granulated blast furnace slag is a chemical and rapidly interacting substance with the formation of a durable material. Thus, under the action of liquid glass, the fluid (given by glass), the slag phase oxides of which CaO, SiOQ, MgO, AlqOi) and others become active and interact both with each other and with liquid glass-JQ oxides to form minerals such as aluminosilicates, tobermorite and others. In addition, free calcium oxide and the selection of the Composition with the lower limits of the ratio of components

Clay

Portland cement

Liquid glass

Ground granulated

blast furnace slag

Water

When hydrated, Portland cement hydrate calcium oxide in an aqueous medium instantaneously interacts with liquid glass, which speeds up the whole process of setting these components. Liquid glass also interacts with the kaolin part of the clay, especially with aluminum oxides. The presence of a rapidly hardening mixture of Portland cement, slag and liquid glass in the clay pulp accelerates its setting and hardening by accelerating the coagulation of the clay slurry, the more this mixture in the clay slurry, the faster its setting and hardening.

The test data of coal for oxidizability in terms of the rate of oxygen absorption by coal after treatment with clay-cement slurry with the addition of liquid glass and ground granulated blast furnace slag in comparison with similar indicators for coal not treated with antipyrogen and coal treated with alumina pulp are given in Table . one.

The use of this composition of clay and Portland cement with the addition of liquid glass from ground granulated blast furnace slag at the proposed ratio reduces the oxidability of the coal and prevents its spontaneous combustion.

0.178

12 h 20 min

Composition with intermediate component ratios

Clay

Portland cement

Liquid glass

Ground Slag

Water

Composition with upper component ratios

Clay

Portland cement

Liquid glass

Ground Slag

Claims (1)

Water Claim of the invention Composition for the prevention of endogenous fires, including clay, port, land cement and water, characterized in that, in order to increase the effectiveness of prevention of endotinous fires by reducing the oxidation of coal and increasing the rate of solidification of the composition, the composition additionally contains liquid glass and ground granulated domain went in the following ratios, weight .: Clay 11.2-16.0 Portland cement 1.0-2.0 Table continuation 0.116 8 h 15 min 0.087  h 35 min, Liquid glass 1.3-2.5 Ground granulated blast-furnace slag2,, 0 WaterErestal Sources of information taken into account in the examination 1.Lindenau NI and others. Origin, prevention and suppression of endogues, coal fires mines, m. Iedra, 1977, p. 306. 2, N. N. Lindenau, et al. Origin, prevention and suppression of endogenous fires in coal mines, M., Nedra, 1977, p. 188-232 (prototype).