SU848058A1 - Method of treating brown coals - Google Patents

Description

I

The invention relates to the enrichment of brown coal, in particular, can be used in the coal, metallurgical and coke-chemical industries from this type.

There is a known method of processing low-caking coals, including rock collection, selective crushing and screening, enrichment and coking.} The disadvantage of it is significant loss of coal in waste and a low yield of low-ash concentrate.

There is also known a method of high-speed heat treatment of coal, including crushing, screening, drying, and 5 heating the coal in several stages to obtain solid pyrolyzed and liquid products.

The disadvantage of this method is the need to process all jj of the original coal, which is not economically viable.

Closest to the offer is a method of processing difficult

enriched coals containing a large number of intergrowths, including crushing, semi-coking, screening with washing in water to obtain classes 0-5 and 5-80 mm, and the class of 5-80 m in water in the drum separator is divided into light and heavy fractions f3.

The disadvantage of this method is the incomplete disclosure of intergrowths with a particle size of up to 80 mm, which does not improve the enrichment of coal and makes the enrichment process ineffective.

The purpose of the invention is to increase the efficiency of processing of brown coal due to the additional additional extraction of the combustible mass.

Claims (2)

This goal is achieved by the fact that the small heat treatment product, together with the heavy fraction of pneumatic separation, is subjected to additional heat treatment with an enrichment process using the gravity method. The drawing shows a scheme for the implementation of the proposed method for processing brown coal. It includes the operations of screening If crushing 2, “thermoelectric classification JlKH 3, air separation 4, heat treatment 5 and enrichment 6 by the gravity method. The proposed method is carried out as follows. Brown coal is divided into classes -50 and +50 mm. The class of +50 mm is crushed to -50 mm and, together with the undersize product of screening I, is directed to thermoelectric classification 2. At 350-400 with coal, the coal is acidified and divided by upward gas flow into classes -3 and +3 mm. A grade of -3 mm is carried away by the flow of gases, and grade 3-50 settles down. Dried coal of the class 3-50 mm is subjected to air separation 3, for example, in a screw section with countercurrent action. An enriched light fraction and a middling yellow fraction are obtained. Kdass of 0-3 mm thermoelectric classification 3 and a heat fraction separation 4 are heat treated 5 (semi-coking). Partially pyrolyzed coal is enriched 6 in an aqueous medium, for example, on a concentrated table. As a result, a low-ash concentrate is obtained from brown coal. The advantage of the proposed method of processing brown coal is that only a small class is subjected to heat treatment, which cannot be effectively separated by a pneumatic method. This increases the productivity of the installation, reduces the specific capital costs. Claims method of processing brown coal, including screening, crushing, heat treatment in a gaseous environment with simultaneous separation by size, separation by pneumatic separation with the production of light and heavy fractions, characterized in that in order to increase the efficiency of processing brown coal by extracting more combustible the masses, the fine product of heat treatment, together with a heavy fraction of pneumatic separation, are subjected to thermal treatment with subsequent separation by gravity. Sources of information taken into account in the examination G. L. Ulitsky. The economics of coal enrichment, M., Gosgortekhizdat, 1960, p.30. 2.Bruer G, G. and others. The Kansk-Achinsk basin is the fuel base of the country, Krasnoyarsk, pp. 25-26. 3, USSR Author's Certificate No. 339571, cl. C 10 V 53/00, 1971 (prototype). / 1gmay france ± C-; lAtoeste yfM