Method to prepare for dressing of difficult coals

FIELD: mining.

SUBSTANCE: method includes treatment of coal extracted from coal deposits for opening of its splices with rock. At the same time the coal is placed in layers at the intermediate storage, arranged on the southern slope of a knoll (mountain, hill) or a pit heap, the site of which has an angle of inclination 10-25°, exposed in spring-autumn periods to solar radiation with the number of "thawing-freezing" cycles with transition of temperature via 0°C equal to at least 7. Besides, the thickness of the coal layers is taken on the basis of the calculation sufficient for daily heating-cooling, and after thermal processing the coal is shipped from the warehouse for subsequent demineralisation.

EFFECT: increased opening of coal splices with rock.

2 dwg

 

The invention relates to mining, in particular to methods of preparation for the enrichment of the produced refractory coals.

The known method of preparation for the enrichment of refractory coals, including processing extracted from coal deposits method of crushing and grinding equipment [1] the Prototype. According to a known method, it follows that detection of intermediate fractions increases with decreasing particle size of the coal and has a maximum opening of splices in the class of 0.5-1 mm.

The disadvantage of this method is that the technical capabilities of crushing equipment can produce coal crushing from an economic point of view only to class - 8(6) mm

Another disadvantage is that coal crushing is carried out only by mechanical impact on the coal mass.

The technical challenge was to develop a way to reduce class crushing coal to increase disclosure of intergrowths of coal with the breed due to both mechanical and alternating thermal exposure of the coal mass.

The proposed method differs in that the mined coal is placed layers in the staging area, located on the southern slope of the hill (mountain, hill) or waste dump, Playground which has a tilt angle of 10-25 degrees, put in the spring and autumn lane the odes to the effects of solar radiation with the number of cycles "thawing-freezing" transition temperature of 0°C is not less than 7, the capacity of the coal layers is the rate that is sufficient for daily heating-cooling, and after heat treatment of the coal shipped from a warehouse for subsequent demineralization at the processing plant.

Introduced in the formula of the invention, a significant feature as that of the extracted coal is placed layers on an inclined surface of the intermediate warehouse, allows us to give the layer a significant area for exposure to solar radiation, and also grind the coal technical means during formation of the layer.

Another significant feature of that site interim storage feature on the southern slope of the hill (mountain, hill) or waste dump, provides the most exposure to the sun's radiation.

The next sign that the site interim storage has a tilt angle of 10-25°, allows the use of direct sunlight for best heating of the coal layer.

A significant sign that the coal layers are subjected to in the spring and autumn periods the effects of solar radiation with the number of cycles "thawing-freezing" transition temperature of 0°C is not less than 7, enables the internal disclosure of aggregates.

The next significant feature about the fact that the thickness of the layers is the rate that is sufficient for daily heating-cooling gap is to be placed, required for processing of coal layers in all their depth.

The essence of the method is illustrated by drawings, where figure 1 shows in plan an intermediate warehouse, figure 2 - section a-a in figure 1.

Conventions on the drawings: 1 - ground; 2 - interim storage of coal; 3 - the southern slope of a hill; 4 - layers of coal produced.

The method is as follows.

Area 1 under the interim storage of coal 2 is formed on the southern slope of 3 hills (mountain, hill) or of the dump with the angle of 10-25°. This arrangement interim storage of coal 2 allows the best use of solar radiation in the spring and autumn periods. Extracted from the field rebellious coal is placed on the platform 1 layers 4 with sufficient power for daily heating-cooling transition through 0°C. the Number of cycles defrost-freeze shall not be less than 7. This number of cycles is selected based on the results in EGGS SB RAS research [2]. After this heat treatment of the coal shipped from the intermediate storage area 2 for further demineralization on the concentrator. In the described technologies in rebellious angle is internal disclosure splices coal rock coal with cracks, cracked. In addition, loading and unloading operations with coal and move it Prohm is filling the warehouse 2 by technical means advanced pulverized coal, that significantly reduces the energy intensity of its subsequent destruction, crushing.

When processing coal with low moisture content of the coal layers additionally moisturize with sprinklers.

Advantages of the proposed method are:

- the use of solar radiation to reduce class crushing coal and increase disclosure splices;

- grinding of coal in the processes of loading and unloading and movement of its intermediate warehouse;

- reducing energy consumption in crushing and preparation for enrichment.

Sources of information

1. Kozlov V.A. study of the values of enrichment for different fractions of the Elga coal Deposit./ Kapustin // Horn. inform.-analyte. bull. - 2011, No. 5. - S-130. Conclusions.

2. Mattis, A.R., and other explosion-free processes for open-pit mining of solid minerals. - Novosibirsk: publishing house of the Siberian branch of the Russian Academy of Sciences, 2007, p.86.

Method of preparation for the enrichment of refractory coals, including the processing of mined coal to the disclosure of his intergrowths with the breed, characterized in that the coal is placed layers in the staging area, located on the southern slope of the hill (mountain, hill) or waste dump, Playground which has a tilt angle of 10-25 degrees, put in the spring and autumn periods the influence of the solar radiation with the number of cycles "thawing-freezing" transition temperature of 0°C is not less than 7, the capacity of the coal layers is the rate that is sufficient for daily heating-cooling, and after heat treatment of the coal shipped from a warehouse for subsequent demineralization.



 

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