The method for producing briquettes from brown coal

 

(57) Abstract:

The invention relates to the production of briquettes from brown coals and can find application in mining and processing industry. The method includes electrochemical processing of brown coal in an aqueous solution of the sodium salt by passing an electric current with formation of a mixture of coal and humates, drying and briquetting at 85-95°C. Humates transferred to humic acid, treating the mixture of coal and humates hydrochloric acid to pH 4.0 to 4.5. The mechanical strength of the briquettes in compression is increased by 10.6-21.8 percent. table 1.

The invention relates to the production of briquettes from brown coals and can find application in mining and processing industry. Known methods of briquetting coal with the addition of a binder in the form of humic acids and their salts /1,2/. Method of briquetting coal /1,2/ includes processing of brown coal 0.1% solution of caustic soda or ammonia at 50-60oC and stirring until a homogeneous mixture. In this mixture injected water to a moisture content of 6-10% and add to the briquetted coal crushed to class 0-2 or < 0.5 mm the resulting mixture was thoroughly mixed and subjected to briquetting at a pressure of 200-600 kg/cm22/A. C. the USSR 64451 C 10 G 5/12, 1945; Khatuntsev L. L. "Physico-chemical phenomena in the process of briquetting solid fuels), Izd-vo an SSSR, 147 C./.

The disadvantages of the methods /1-2/ is a multistage process, due to the need of receiving at the first stage of humates on the second selection, the third injection into the coal supplied to briquetting, thorough mixing, and low mechanical strength of the briquettes.

The prototype of the present invention may be a method of obtaining a mechanically stable briquettes described in /3/, which are as follows. After electrochemical treatment of brown coal in the electrolyte solution (chloride and sodium sulfate) the resulting pasty mixture of coal and humates. The resulting mixture of coal and dry humates and bitteroot at 85-95oC, resulting in a gain briquettes with high mechanical strength /RF 1804093, C 10 G 5/04, 1996/.

The disadvantage of this method /3/ is limiting, i.e., the presence of limit values maximum mechanical strength of the briquettes in compression, which is caused by the technological parameters of the electrochemical process, in particular by the electrolysis time, t which decreases performance.

The invention consists in that with the purpose of increasing the mechanical strength of the briquettes to compress the mixture of coal and humates treated with hydrochloric acid to pH 4.0 to 4.5, i.e., humates, rather than selecting from a mixture of coal, transferred to humic acid, resulting in the mechanical strength of the briquettes in compression is increased by 10.6-21.8 percent.

To obtain briquettes was taken brown coal having the following characteristics (wt.%): Ad- 13,6, Wa- 6,6, Vdat- 53,1, Sd- 0,24, crushed to particles less than 2.5 mm

The original coal was processed by electrochemical method /4/ /RF 1648077, C 10 G 1/04/. I.e., to the original coal was added 33 ml of 5% solution of sodium chloride. The addition of the electrolyte solution is made so that the coal was in a pasty condition, but was not strong foaming. A portion of the coal was placed in the electrolytic iron cell, which was the cathode. The anode was applied to the platinum wire with a diameter of 0.45 mm Electrochemical processing in the near-cathode space was carried out for 3, 6, and 12 h at a constant voltage of 12.0 V and current of 1.0 A.

At the end of the electrolysis the mixture of coal and humates delila humates (option 1, table).

The second part was treated with 5% solution of hydrochloric acid so that the pH was equal to 4.0 to 4.5, i.e., humates were converted into humic acid. In this case, the role of the binder is performed humic acid (scheme 2, table).

Obtained for two variants of the mixture (with humates and humic acids) to dry a little to a moisture content of 20-22%, was heated to 85-95oC and then pricecialis when the pressure briquetting 510 kgf/cm2. The resulting pellets had a density of 940-980 kg/m3humidity 14-19%, ash content of 14.4%, the calorific value of 16.1 MJ/kg

The strength of the briquettes was determined not earlier than 4 hours after the manufacture of briquettes. The mechanical strength of the briquettes on the compression of the raw coal under similar conditions briquetting was 30,0 kg/cm2.

The test results briquettes are presented in the table.

From the table it is seen that the mechanical strength of the brown coal briquettes increases in the case of the use as a binder of humic acids (option 2) 10.6 - 21.8% compared with the mechanical strength of the briquettes obtained by using as a binder of humates (variant 1).

Thus the second method of producing briquettes provides a wide application of the method in the absence of the need for multi-step operations humic acids, their selection, further adding to the briquetted weight as a binder and reduce the time of electrochemical processing.

In General simplifies the process while increasing the mechanical strength of the briquettes in compression.

The method for producing briquettes from brown coal, including its electrochemical treatment in an aqueous solution of the sodium salt by passing an electric current with formation of a mixture of coal and humates, drying and briquetting at 85-95°C, characterized in that the humates transferred to humic acid, treating the mixture of coal and humates hydrochloric acid to a pH of 4.0 to 4.5.

 

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