SU953226A1 - Composition for preventing treating of coal seam - Google Patents

Description

The invention relates to mining and can be used for prophylactic treatment of coal seams; period of advance degassing of coal deposits carried out 3-5 years before the start of preparatory and treatment works.

A known composition for treating a coal seam used to increase its permeability, which is an emulsion, which includes an organic liquid, a surfactant and an aqueous acid solution [1].

However, the presence of mineral coal components in strong organic solvents is unacceptable with the existing mining technology in view of the damage to the health of people present in the mine workings.

Also known is a composition for treating a coal seam; consisting of a 0.5-10% hydrochloric acid solution and neutralization £ 2].

However, the known composition has a limited scope, i.e. it is effective only when used on high carbonate formations.

The aim of the invention is to increase the effectiveness of the composition on coals, in the ash of which there are e compounds of iron.

This goal is achieved in that the composition contains sulfosalicylic acid as an acid in the following ratio of components, wt.% 1

Sulfosalicylic acid 5-10

Water Else

The technology for using the composition is as follows.

An aqueous solution of sulfosalicylic acid with a concentration of 2Q 5-10% is injected through a well drilled, for example, from the surface to the coal seam. In this case, the mineral components of coal are dissolved (iron compounds of the CuFeS type j, FeClj type) with the formation of soluble ferrotrisallicate, which is pumped out after a sufficient time for the initial amount of acid to react.

The optimal concentration of the proposed composition was revealed by a laboratory experiment, the results of which are given in the table.

The concentration of sulfosalicylic acid in the composition before treatment,% Ash, % The residual content of iron compounds in ash,% Exposure time, days

8.3 62.47 1 7.7 56.06 thirty 3 9.3 56.37 thirty 5 7.1 ' 39.40 thirty 9 4.6 50.36 thirty 10 3,5 36.81 thirty

As can be seen from the table, the smallest ash content of coal corresponds to the concentration of 20 composition equal to 5-10 wt.%. > _F

The use of sulfosalicylic '·; acid in the proposed composition reduces the ash content of coal by 30-50% due to the dissolution of iron and pe. 25 of translating it into a soluble, colored complex of ferro-trisalliciate. This increases the gas permeability of the coal seam.

Dissolution of the proposed composition of pyrite (FeS <j), containing ³⁰ koto- ryh fire risk is caused by the condition of the formation, improves safety of mining abot in seams that are prone to spontaneous combustion. Dust formation is also reduced due to the wetting ability of sulfosalicylic acid.

In addition, the proposed composition has a coloring property, i.e. allows to identify the ways of spreading the solution through the formation, which facilitates the control of the treatment zone.

Thus, the use of the proposed composition provides effective prophylactic treatment of 45 all types of coal, in the ash of which there are iron compounds, by dissolving the latter, which will improve the quality of the produced coal, reduce spontaneous combustion of coal during its extraction, and facilitate control of the treated zone by coloring the reaction products and reduce dust formation due to the surface-active properties of sulfosalicylic acid.

Claims (2)

As can be seen from the table, the nominal ash content of coal corresponds to a composition of 5–10 wt.%. The use of sulfosalicylic acid in the proposed composition reduces the ash content of coal by 30–50% by dissolving the iron compounds and converting it into a soluble colored ferrotrisation complex. . This increases the gas permeability of the coal seam. Dissolving in the proposed composition of pyrites (FeSij), the content of which causes the fire hazardous state of the reservoir, contributes to the safety of mining operations in seams that are prone to spontaneous combustion. Dust generation is also reduced due to the wetting ability of sulfosalicylic acid. In addition, the proposed composition has a coloring property, i.e. Allows detection of the propagation path of the solution through the reservoir, which facilitates control of the treatment zone. Thus, the use of the proposed composition provides an effective prophylactic treatment of all grades of coal, in the ashes of which there are iron compounds, by dissolving the latter, which will improve the quality of the coal produced. reduce the spontaneous combustion of coal during its excavation, facilitate control of the treated area by staining the reaction products and reduce dust generation due to the surface-active properties of sulfosalicylic acid. Claims of the invention Composition for prophylactic treatment of a coal seam, including acid and water, characterized in that, in order to increase the effectiveness of the composition on coal, in whose ash are present. iron compounds, it contains sulfosalicylic acid as acid in the following ratio of components, wt.% Sulfosalicylic acid 5-10 Water Remaining Sources of information taken into account in the examination 1. US patent 3,971,535, cl. 252-8.55, publ. 1975. 2. Authors certificate of the USSR. 248601, cl. E 21 F 5/00, 1966 (prototype).