Method for briquetting of coal sludges

FIELD: technological processes; metallurgy.

SUBSTANCE: invention may be used for recycling of chemical-recovery production wastes. Coal sludges are loaded in molds 1 of transporter 2 and supplied to furnace 3, where they are thermally treated. Briquetting is done without binding agent, and thermal treatment is carried out at the temperature of 330-390 °C for 120-40 minutes.

EFFECT: reduction of prime cost and increase of briquettes mechanical strength.

1 tbl, 1 dwg

 

The invention relates to the field of waste coke production, and in particular to methods of briquetting coal fusou, coal slurries and small classes of coal. These briquettes can be used as fuel for combustion in domestic and industrial furnaces, as well as for coking in the coking and metallurgical industries.

A method of obtaining coal briquettes (Patent RF 2059690, publ. 10.05.1996). In accordance with this method, coal or sludge is mixed with a solution derived alkali metal salts of sulfonic acids, pressing the mixture into pellets, drying the pellets, followed by coating the surface of the briquettes uglevodosoderjati water-resistant coating.

For reasons that impede the achievement of specified following technical result when using the known method are the use of binders, extrusion and drawing moisture-proof coating, which complicates the technology of briquetting and increases the cost of the briquettes.

There is also known a method of briquetting coal (patent RF №2233864, publ. 10.08.2004). In accordance with this method, the coal sludge clarifiers coal mines and coal preparation plants subjected to pressing, drying and cooling, after which the outer surface of the briquettes cause the protective coating.

For reasons impede the achievement of the specified lower technical result when using the known method is the large number of technological processes (pressing, drying, cooling), which increases the cost of the briquettes.

Closest to the present invention is a method of producing fuel briquettes (Patent RF №2227803, IPC 7 C10L 5/10, C10L 5/12, publ. 27.04.2004). In accordance with this method, the coal slurry and coal is mixed with a bonding material made of cement with lime, bitteroot and conduct heat treatment at a temperature of 120-150°C.

For reasons that impede the achievement of specified following technical result when using the known method include: (a) the use of a binder, which increases the cost of briquettes; b) heat treatment at a temperature of 120-150°which does not help to increase the mechanical strength of the briquettes, and only removes moisture.

The objective of the invention is to develop a simple and cheap method of briquetting coal fusou.

The technical result is to reduce the cost, increase the mechanical strength of the briquettes.

This task is achieved in that in the method of briquetting coal fusou, including downloading fusou in shape, briquetting and subsequent t is micescu processing, according to the invention briquetting carried out without a binder, and a thermal treatment is carried out at a temperature of 330-390°for 120-40 minutes, using the heat of exhaust flue gases.

The invention is illustrated in the drawing, which shows a flow chart of briquetting coal fusou.

The installation, which implement the inventive method, contains forms 1, conveyor furnace 2 and 3 for the briquetting process.

The inventive method of briquetting coal fusou is as follows.

Solid and plastic waste by-product coke production coal of fuse (hereinafter fuse) download in form 1 of the conveyor 2 and is served in the furnace 3, which is subjected to heat treatment. Briquetting is carried out at a temperature of 330-390°S, the residence time of fusou in the oven 120-40 minutes. With increasing temperature processing briquettes decreases the time of their stay in the oven (at a temperature of 330°the residence time in the furnace 120 minutes at a temperature of 390° - 40 minutes)and, therefore, reduces the cost, but at the same time there is a decrease in strength properties. The recommended range of temperature and residence time in the furnace is selected on the basis of experimental studies on the basis of minimum reduced cost and of sufficient strength required for that is cast briquettes.

The speed of movement of the conveyor 2 is determined by the residence time and temperature fusou in the furnace 3. Typically, the conveyor length L specified or calculated by the project. In addition, the temperature of the flue gases sent into the oven for briquetting (350°).

The temperature of the flue gases determine the time τ stay fusou in the oven (because(where σ - strength, t is the temperature), and the speed of movement of the conveyor is determined by the dependence of L

,

where ω - the speed of movement of the conveyor;

L is the length of the conveyor;

τ - stay fusou in the oven.

In the furnace 3 serves flue gases from the output of production of coke and then submit the form briquettes. Before filing forms with the briquettes in the oven the oven is heated flue gases to a temperature of flue gases. Currently, the flue gases after the coke oven battery with a temperature of about 350°released into the atmosphere through the pipe. The use of flue gas in the present method allows to utilize the heat released today into the atmosphere. Output conveyor unload the finished briquettes.

An example of a specific application of the method.

The table shows the test results of samples of coal-coke briquettes obtained by the present method when thermal processing is TCE in a muffle furnace in the laboratory.

No. sampleProcess temperature, °The process time minAsh content, %Volatile, %Volatile (without ash), %The fur. strength, kgThe fur. etc. after 24 h in water, kg
11803006,119,1-19,620,3-20,914-19
22402556,0of 16.3 to 16.4the 17.3-17,423,48,2
32801705,812,813,620
43301206,110,711,414,75
5350806,210,711,416,95,8
6390406,311,712,513
7450306,4of 8.7 to 8.8of 9.3 to 9.411
849530 7,0of 7.1 to 7.4of 7.6 to 7.98,2

Using the proposed method of briquetting coal fusou allows you to achieve simplification of the briquetting technology by eliminating the operation of mixing fusou with a binder, using the heat of exhaust flue gases and, consequently, to reduce the cost of fuel briquettes.

Method of briquetting coal fusou, including downloading fusou in form and subsequent heat treatment, characterized in that the briquetting carried out without a binder, and a thermal treatment is carried out at a temperature of 330-390°for 120-40 minutes



 

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