SU1423747A1 - Method of preventing endogenic fires - Google Patents

Description

(21) 4166989 / 22-03

(22) 12/24/86

(46) 09/15/88. Bul 34

(71) All-Union Research Institute of Mining and Rescue

(72) A.I. Kozlyuk, N.V.Kaledin, N.A.Kue and A.S. Grebtsova

(53) 622.807 (088.8)

(56) USSR Author's Certificate No. 1149032, cl. E 21 F 5/00, 1985.

USSR author's certificate 1260532, cl. E 21 F 5/06, 1985.

USSR Author's Certificate No. 116300I, cl. E 21 F 5/00, 1983.

(54) METHOD OF PREVENTION OF ENDOGENOUS FIRES

(57) The invention relates to mining and can be used to prevent coal from spontaneous combustion.

in mines, cuts and coal warehouses. The purpose of the invention is to increase the effectiveness of preventing endogenous fires by reducing the oxidative activity of the rock mass. The rock mass is treated with an antipyrogen, which uses an aqueous solution of bischofite. The latter is a crystalline, non-toxic, highly hygroscopic substance of a grayish-brown color, readily soluble in water. At the ignition stage, the mechanism of protection of boron-containing compounds that are part of bischofite acts, which, when slowly heated in air, first swell in crystallization water to a frothy mass, then melt to form a vitreous impermeable film that prevents oxygen from reaching the coal surface and igniting it.

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The invention relates to mining, primarily to safety, and can be used to prevent the spontaneous combustion of coal in mines, cuts and coal depots.

The aim of the invention is to increase the effectiveness of preventing endogenous fires by reducing the oxidative activity of the rock mass.

To prevent spontaneous combustion of coal, b5ppophyt is used as an antipyrogen, Bitumen deposits are crystalline, non-toxic, strongly hygroscopic, grayish-brown, readily soluble in water.

The mineral composition of bischofite,%: Bishofit 95-98 Karnallit 1-5 Galit2-3

Kizerit1-2

Anhydrite 0.5-1

Borates1-2

Bromate2-3

The bischofit property of dissolving well in water allows it to be used to obtain the cheapest and most efficient method by transferring it to a liquid state underground and siphoning out in the form of a brine through a well. Bishofit brine is used to produce magnesium, bromine, boron and other substances.

Chemical Characteristics of bischofite brine, g / l: Mg C1 Bg B

SO, HCOj Ca

Na + K I An. + Cat.

PH, brine density at 1, 34 g / cm

The complex of inorganic salts — chlorides, sulfates, borates, and bromides — calcium, potassium, sodium, and others, which are part of bischofite, gives it the properties of an effective oxidation inhibitor.

The high inhibitory ability of the mineral can be explained by a combination of the strong moisture-absorbing properties of bischofite with the mechanism of synergistic

210-23P

420-450

5.0-5.6

0.05-0.5

1.32-1.40

0.415-0.425

0.4-0.5

0.3-0.5

440-460

brine density

five

0

five

Q

five

0

five

0

five

action of a complex of substances included in its composition.

By absorbing moisture from the air, bshpofit can increase its content in coal to 5–8%. Dissolving in the absorbed water, bischofite forms a film of salt solution that prevents evaporation of moisture from the coal and the access of oxygen to the coal surface. Moisture loss starts at a temperature well above that which causes the duration of the effect of bischofite as an oxidation inhibitor under conditions of low-temperature oxidation of coal.

A further increase in the temperature of the coal leads to the decomposition of the anti-pyrogen occurring with the absorption of heat, which significantly reduces the activity of the coal with respect to oxygen and slows down the process of its combustion due to the effect of at least two different effects of the blue-syngiosis mechanism.

one

One of them, acting at the ignition stage, is the defense mechanism of boron-containing compounds that are part of bischofite, which, when slowly heated in air, firstly swell in crystallization water to a foamy mass, and then melt (-lyO C) to form a vitreous impermeable film (matrix), preventing access of oxygen to the surface of the coal and its ignition.

Another inhibitory effect arising at the stage of the gas-phase oxidation process is caused by the release of hydrochloric and hydrobromic acids in the hydrolytic cleavage of chlorides and bromides of the hydrochloric acid, which are active in initiating an open circuit of the combustion chain, by reducing the concentration of high-energy OH radicals that contribute to the propagation of the chain reaction of the combustion chain, by reducing the concentration of high-energy OH radicals that contribute to the propagation of a chain-breaking combustion chain, by reducing the concentration of high-energy OH radicals that contribute to the propagation of a chain-breaking combustion chain, by reducing the concentration of high-energy OH radicals that contribute to the propagation of a chain-breaking combustion chain, by reducing the concentration of high-energy OH radicals that contribute to the propagation of a chain-breaking combustion chain, by reducing the concentration of high-energy OH radicals that contribute to the propagation of a chain-breaking combustion chain, by reducing the concentration of high-energy OH radicals that contribute to the propagation of a chain-breaking flame, it reduces the problems and the distribution of the chain reaction. .

Preventive work to prevent spontaneous combustion consists in injecting a bischofite aqueous solution into the formation.

The optimal concentration of bischofite solution that provides inhibitory efficacy is its 5% concentration.

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Claims (1)

The claims of the invention do not prevent the prevention of endogenous dog fires by reducing fires, including treating the mountain oxidative activity of rock mass with an antipyrogen, as an antipyrogen, so that an aqueous solution can be used as an antipyrogen. bigaofita.