Carbon briquette fabrication process

FIELD: manufacture of building materials.

SUBSTANCE: carbon briquettes based on ground carbon-containing starting material (peat, coals, and the like) are fabricated by mixing starting material with 30-50% of water, treating the mix on rotary cavitation apparatus in 5 to 50 operation cycles at 15 to 70°С and cavitator rotor speed 3000-12000 rpm, pouring out thus treated mix into special molds, wherein mix is dried in air flow at 15 to 100°С to form ready-to-use briquettes (after cooling, if needed).

EFFECT: simplified fabrication process and increased process efficiency.

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The invention relates to technologies of production of briquettes on the basis of the carbon materials (peat, coal and others) and can be used in road and industrial construction for fuel briquettes for household needs, manufacture of graphite electrodes, partial briquetting of coal charge for coking and other

Typically, when the production of carbon briquettes use binders (adhesives, glues and other), can join the separated particulate matter (body) and to maintain the strength of the composite under the action of external factors. Depending on operating conditions binders behave as a viscous material or as an elastic body. Widespread thermoplastic organic carbon bond - bitumens, pitches and resins, petroleum and coal origin.

The use of carbon binder for the production of asphalt mixes, graphite electrodes, strengthening of buildings and structures described in /1-4/.

A method of obtaining carbon briquettes for household needs and coking partially briquetted coal mining /5-6/, which consists in grinding coal, mixing the crushed coal charge with heated carbon binder, heating the obtained carbon mass to plastic state and e is pressing at pressures up to 20 MPa to form pellets and then cooled.

The disadvantage of this method is to use for making briquettes expensive carbon bond and presses, which often fail due to the buildup in them viscous carbon mixture and carburizing press parts with their subsequent destruction. This complicates the technology of production of carbon briquettes and significantly increases the cost of production.

A method of obtaining carbon briquettes from peat /7/, we adopted for the prototype, according to which the peat pulverize, diffuse, dried underflow in the dryer and pressed dried crumb in dvukhstadiinykh peat presses at a pressure of 1200 kg/cm2.

The disadvantage of this method (prototype) is associated with the necessity of screening of peat after grinding, the use of presses and high pressure, which greatly complicates the technology of production of briquettes.

The objective of the invention is to simplify the production of carbon briquettes and increase its effectiveness.

This is due to the fact that the method of obtaining carbon briquettes on the basis of chopped carbon carbon charge the charge is mixed with 30-50 wt.% water is treated in a rotary suction apparatus at a temperature of 15-70°within 5-50 cycles and the number of revolutions of the rotor of the cavitator 3000-12000 per minute, obtained water from leadnow mixture is poured into a special form, dried in a current of air at 15-100°before the formation of the briquettes, which, if necessary, cooled and used.

During cavitation, followed by luminescence, ionization and other water and carbon mass, the formed gas bubbles size 50-120 μm, leading to activation of water, removal of hydrocarbons adsorbed on the particles of the carbon material, and the formation of active centres on the surface /8/.

These cavitation bubbles filled with gas, steam or mixtures thereof. The collapse of the bubbles is accompanied by adiabatic heating of the gas (hydrocarbons) in them to a temperature of 10With /9/. Consequently, the heated water and carbon mixture, facilitating the removal of low-boiling compounds. In addition, when cavitation in water are formed radicalsand peroxide of hydrogen and hydrocarbon radicals, humic acids and carbon crystallites charge, contributing to a significant increase in reactivity of the water-carbon mixture.

Bubbles slam during the half cycles of compression, creating short-term (on the order of 10-6sec) pulse pressure (up to 103Mn/m2=104kgf/cm2and more). These pressure pulses, resulting in cavitation bubbles rise to the formation of radicals and active C is ntrol in the water-carbon mixture, which leads to their interaction with each other and forming a solid volumetric relationships. The accumulation of hydrogen peroxide leads to oxidation of humic acids and carbon charge on the mechanism associated with the formation of radicals and active particles, which increases the propensity for adhesion interaction of components in the resulting briquette. When removing water from water-carbon mixture exempt active centers of the crystallites and humic acid carbon mixture, which leads to increased stability of the links between carbon particles of the charge and the strength of the briquette.

The ratio of carbon charge/water is 70/30-50/50. The increase of this ratio more than 70/30 undesirable because it increases the viscosity of the water-carbon mixture, and the decrease of the ratio below 50/50 increases the energy consumption for the evaporation of water from the water-carbon mixture and the cost of production of briquettes.

The cavitation process water-carbon mixture is carried out when the number of revolutions of the rotor of the cavitator (CORK) 3000-12000 per minute. Reducing CORK below 3000 per minute is not possible to obtain water-carbon mixture with a high reactivity, which significantly reduces the strength of a briquette. Increase CORK more than 12000 per minute is limited to the state of technical development at the present time.

The number of cycles (CC) processing of water-carbon mixture is 5-50. In the C treatment is less than 5 is obtained briquettes with low strength. CC equal to 50 and below, enough for making briquettes with optimal strength. Increase CC more than 50 increases the energy consumption for the activation of the water-carbon mixture.

During cavitation of water-carbon mixture is heated from 15 to 70°that helps to remove a volatile component and its activation.

The essence of the proposed method is illustrated by examples.

Example. A mixture containing, wt.%: peat 30, lignin 10, Kansk-Achinsk brown coal 15, water 45, pulverized in a ball mill. Then the crushed water-carbon mixture is treated in a cavitation apparatus described in patent No. 2131087, MKI 6 F 23 To 5/12, F 23 D 11/34, when CORK 3500 per minute, the number of cycles 50 and a temperature of 15°C. When the cavitation processing temperature water-to-carbon mixture rises to 70°With the result that removed low-boiling compounds and reactivity of the mixture increases. The obtained water-carbon mixture is metered into the prepared form, on the conveyor, dried in a current of air at 80°before the formation of the briquettes are cooled and sent to the warehouse of finished products.

The resulting briquette cubic shape with a size of 5.8 cm × 5.8 cm × 5 cm with a compressive strength of 9.3 kg/cm2.

Similarly get cakes from mixes containing peat, lignite, petroleum coke and water. The results of determination of sod is Rania component in the briquettes, received after the cavitation treatment of water-carbon mixtures and by known techniques by pressing the carbon mass under pressure, the parameters of the cavitation characteristics of the briquettes are summarized in table. The table shows that the strength of the briquette crush strength after cavitation water-carbon mixture reaches of 16.9 kg/cm2. The briquettes obtained by known techniques by pressing carbon mixture, characterized by the crushing strength of up to 6 kg/cm2. Therefore, the proposed method outperforms well-known (prototype /7/) on the strength of the obtained carbon briquettes. In addition, the proposed method is easier known (prototype), as there are no stage sieving the crushed carbon mixture and pressing. In the absence of the need to use presses, high pressure in the proposed method, it is superior to known economic indicators: energy consumption, cost of the resulting product and other

Literature

1. Prudnikov IN the Production of petroleum bitumen, M.: Chemistry. 1983. 192 C.

2. Baked astray freight Durability of bitumen and bituminaria coatings. M.: Stroiizdat. 1981. 123 S.

3. Rudensky IM, ALEXANDER Rudensky Organic binders for road construction. M: Transport. 1984. 229 C.

4. Dol is the ATA L.V. Getting pitches in the schemes of deep oil processing // Chemistry and technology of fuels and oils. 1987. No. 7. P.8-9.

5. He was the A.T. Briquetting of coal with a binder. M.: Nedra. 1972. 216 S.

6. Vasiliev US, Dumanov A.G., Caftan US and other Industrial check the efficiency of the method of partial briquetting of coal charge with binder // coke and chemistry. 1985. No. 6. P.10-14.

7. Belinko MG, Petrovsky E.E. Technology peat production. M: 1968.

8. Grinnin Y.A., Zubrilov A.S., Zubrilov S. p., Afanasiev, S. p. // J. physical chemistry. 1996. So 70, No. 5. S-930.

9. The great Soviet encyclopedia. M: Soviet encyclopedia. 3rd ed. 1973. T. S-113.

The method of obtaining carbon briquettes on the basis of powdered carbon mixture, wherein the carbon mixture is mixed with 30-50 wt.% water is treated in a rotary suction apparatus at a temperature of 15-70°within 5-50 cycles and the number of revolutions of the rotor of the cavitator 3000-12000 per minute, obtained vodopadnoy mixture is poured into special molds, dried in a current of air at 15-100°before the formation of the briquettes, which, if necessary, cooled and used.



 

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