SU1346816A1 - Composition or preventing endogenic fires - Google Patents

Abstract

The invention relates to mining. The purpose of the invention is to increase the effectiveness of prophylaxis by reducing the chemical activity of coal. The composition contains components in their following ratio, May. %: liquid glass 6.6-10.6, the rock burned 13.8-45.2, ferric chloride 0.8- 4.7, water - the rest. Ferric chloride is introduced into the composition as a coagulant with ground burned rock, reduces the alkalinity of the medium, and plays the role of a trivalent electrolyte. Due to this, the composition at high temperatures does not emit harmful gaseous substances. The composition is prepared in the form of a suspension. The burnt rocks of the mine shafts are first crushed, then grind on a ball or rod mill to a specific surface area of 2000 - 3000, then the resulting grinding is mixed with water and the components are introduced with subsequent mixing. The finished composition is treated with spraying devices in the surface of the broken coal and collapsed rocks. 2 tab. i (L with O5 bo

Description

The invention relates to mining and can be used to prevent endogenous fires in underground mines.

The aim of the invention is to increase the effectiveness of prophylaxis by reducing the chemical activity of coal.

The introduction into the solution of liquid glass and water of ground burned rocks of mine dumps and ferric chloride in the proposed amounts has a significant effect on the properties of the prophylactic composition. Thus, the particles of burning rock molten rock adsorb liquid glass solution onto their surface, reducing its fluidity. In addition, under the action of an alkaline medium created by liquid glass, the burnt rocks, having oxides SiO j, CaO, MgO, and others, chemically interact with the constituent components of liquid glass to form a material that has hardening. As a result, the adhesion of the composition to the coal is improved and a strong, not brittle, less soluble film is protected against oxidation on its surface.

The ferric iron introduced into the composition together with the ground burned rocks allows to reduce the alkalinity of the medium to a pH of 8.3. In this case, ferric chloride in the mixture plays the role of a trivalent electrolyte and coagulant and is bound in the process of chemical interaction into complex compounds, therefore at high temperatures the composition of the mixture does not emit harmful gaseous substances.

Comparative results of the properties of the known and proposed formulations are given in table. 1 and 2.

The technological properties of the inventive suspension formulation for the prevention of endogenous fires vary as follows. The density increases from 1.28 to 1.42 g / cm, the viscosity is 16-18, the onset of sedimentation begins in 12.5-41 s, the end of sedimentation after 6-20 s, the sedimentation rate ranges from 0.75 to 2.2 cm / s. Technological properties of the proposed composition for the prevention of endogenous fires in the form of a suspension from an aqueous solution of liquid glass, ground

Breeds and ferric chloride are generally improved and meet the requirements and prophylactic compositions (Table 1).

The results of coal oxidation, as measured by the change in the oxygen absorption rate constant by coal I over time, confirm the reliable protection of coal against oxidation and its subsequent spontaneous combustion. At the same time, in the initial periods (incubation period) after 44 hours, as compared with the aqueous solution of liquid glass, the oxidability of the coal decreases 1.3-2.5 times and amounts to 0.218-0.115 mt / h, and as compared with with a solution of liquid glass with the addition of CaCl1, the oxidability of coal decreases 2.4–4.8 times (Table 2).

The preparation of the proposed composition for the prevention of endogenous fires in the form of a suspension is carried out as follows.

The burnt rocks of the mine dumps are first crushed, then milled on a ball or rod mill to a specific surface area of 2000 - 3000. Liquid glass is used

with module 2.0-2.5, to obtain

the proposed composition of the desired consistency (T: g) in mixers such as ball or rod mills, as well as other types of mixers, ground burned rocks are mixed with water, then liquid glass and ferric chloride are introduced with subsequent mixing of all components until a homogeneous state. Ready preventive

the mixture in the form of a suspension is pumped through a pipeline to a clearing slab, through which the pipeline is continued, and holes are made from it into the tube-shaped space.

The branches along the entire length are equipped with spraying devices, with the help of which the surface of the broken coal and crushed rocks are treated with a prophylactic composition.

Claims (1)

Invention Formula Composition for the prevention of endogenous fires, including liquid glass, coagulant and water, characterized in that, in order to increase the effectiveness of prevention by reducing the chemical active 1346816 coal, it additionally contains milled, burnt rocks of mine dumps, and as coagulant, ferric chloride in the following ratio of components, May. 7 ,: was burning iron flowed 13.80 10.60 4.70 rest 1.34 was burning iron flowed 17.60 10.30 0.90 remaining 1.30 was burning iron flowed 29.70 8.70 1.60 rest 1.28 45.20 6.60 0.80 1.42 glass 28.3 rest m flowed burned iron 6.6-10.6 13.8-45.2 0.8-4.7 Rest Table 1 16.7 12.5 23.8 1.65 18.95 14.0 26.0 1.48 18.35 20.2 10.8 2,2018, 7 41.0 6.0 0.75 1.18 was burning iron flowed was burning iron flowed was burning iron flowed 13.80 10.6 4.70 rest 17J60. 10 ° 30 0.90 rest 29.70 8.70 1.60 rest 0.218 0.183 0.118 was burning iron glass glass 45.20 6.60 0.80 rest 28.3 rest 0.115 0,289 table 2 0.087 0.048 0.035 0.014 0.087 0.042 0.024 0.012 0.077 0.026 0.021 0,009 0.042 0.022 0.018 0,008 0.196 0.058 0.043 0,019 Liquid glass 5.0 Calcium Chloride 5.0 Water rest 0.559 0,268 0,129 0,058 0.029