Method of briquetting coal

 

The invention relates to the field of briquetting of minerals, in particular to the technology of briquetting coal and anthracite coal, and can be used in the coal mining and coal processing industry. Way to lead by pressing coal sludge clarifiers mines and coal processing plants, in which the resulting briquettes are sent to drying and subsequent cooling, after which the outer surface of the briquettes cause the protective coating to protect them from the harmful effects of the environment. The invention solves the problem of disposal of fine coal slurries class 0-1,0 mm accumulated in the sumps mines and coal processing plants, to simplify and cheapen the technology of briquetting coal without binding and to improve the environmental situation in the coal mining regions. 3 C.p. f-crystals, 1 Il., 1 PL.

The invention relates to the field of briquetting of minerals, in particular to the technology of briquetting coal and anthracite coal, and can be used in the coal mining and coal processing industry.

Known methods of briquetting coal and antratsitovsky (bitumen, coal tar pitch, sulfate distillery stillage, solid clay, cement), compressing the mixture pressure of 20-50 MPa, and subsequent cooling (see A. he was So “briquetting of minerals”, M: “Nedra”, 1989, S. 86, 92, 98, 101, 106).

The above methods have the following disadvantages.

First, the need to use the binder greatly complicates and increases the cost of the process of briquetting coal, because it determines the operations deep dewatering and thermal drying of raw coal to the minimum values for humidity, i.e., up to 2-3%.

Secondly, the need for thorough mixing of coal with a binder associated with the use of additional equipment, namely: malaxer and various metering devices.

Thirdly, the existing technology of briquetting coals and anthracites are not intended for use as a feedstock fine coal slurries class 0-1,0 mm from the mining and processing discharged into the lagoons of these enterprises, worsening ecological environment in mining areas.

The proposed solution is aimed at solving problems for disposal encoding volumes on the simplification and cheapening the technology of briquetting without binder and to improve the environmental situation in the coal mining regions.

The task is solved in that the extrusion is subjected to coal sludge clarifiers mines and coal processing plants, and the resulting briquettes are sent to drying and subsequent cooling, after which the outer surface of the briquettes cause the protective coating to protect them from the harmful effects of the environment.

Indeed, pressing coal slurries class 0-1,0 mm clarifiers mines and coal preparation plants containing clay and silt particles class 0-0,05 mm, without using a binder makes it possible to greatly simplify the technology of manufacturing briquettes, to lower their costs and to address the issues of improvement of ecological situation in the coal mining regions.

As an example, here is the characteristic parameters of coal slurries class 0-1,0 mm Central coal preparation plants “Abashevskaya” ,Novokuznetsk testing flotation waste in August 1997,

The table shows that the highest ash content have classes 0-0,05 mm and 0.05-0.1 mm, are clay and silt tone is investing. Performed research and experiments confirmed the industrial feasibility of the proposed method of disposal of sludge waste mines and coal preparation plants.

The comparison of the proposed technical solutions to the prototype allows us to conclude that it is significantly different from the prior art and the technology of briquetting coal introduction of new essential features listed above and meets the criteria of novelty, inventive step and is industrially applicable.

The proposed solution is illustrated in the drawing, where a flow diagram of the operation of the technology of briquetting coal sludge from septic tanks mines and coal preparation plants.

This method of briquetting coal sludge is implemented as follows.

From pits mines and coal preparation plants coal sludge class 0-1,0 mm benefit scoop excavator (not shown) and discharged to the drainage area and accumulate in the form of a conical piles, in which the discharge of excessive moisture, bringing humidity slurry product to 12-20%.

Next, the slurry trucks delivered directly to the place of his brication the amount converters in a hopper 1 (see the drawing), from which the sludge in a certain way poured into molds of the press 2 and the working body affect portions of the slurry pressure 30-80 MPa for 5-15 seconds, resulting in the formation of the briquettes some form, however, a greater pressure corresponds less time pressing. Prepared batch of briquettes is directed into the drying chamber 3, in which it dwells within one-half hours at a temperature of 120-180C. In the heat treatment of the clay and silt particles class 0-0,05 mm “are cemented and dried briquettes acquire sufficient mechanical strength for their transportability by any means of transport.

From the drying chamber briquettes are sent to the zone 4 and the exercise of their cooling to 20-25With, followed by in the shop 5 laminating the external surface of the bricks to prevent them from cracking and breaking under the influence of precipitation.

Claims

1. Method of briquetting coal, including drying, pressing and cooling, characterized in that the extrusion is subjected to coal sludge clarifiers coal mines and pleebo the following which at the outer surface of the briquettes cause the protective coating to protect them from the harmful effects of the environment.

2. The method according to p. 1, characterized in that the pressing send fine coal slurry humidity 12-20%, and the pressing is performed with the pressure of 30-80 MPa, within 5-15, depending on the pressure.

3. The method according to p. 1, characterized in that the drying of the pellets is carried out at a temperature of 120-180C for 1-1,5 hours

4. The method according to p. 1, wherein after cooling the briquettes their external surface is subjected to lamination.

 

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