The method of obtaining the coke briquettes "koksbrik"

 

(57) Abstract:

Usage: as an energy source, a reducing agent for the electrothermal production of phosphorus, iron, steel, ferro-alloys, refractory products, sugar, and also as fuel for domestic and industrial furnaces. The essence of the invention: in the proposed method, including the mixture of coke breeze with 3-10 wt.% binder based on the derived sulfonic acids, briquetting the mixture, and subsequent heat treatment at 200-700oC for 10-120 min, for use mixing coke breeze particle size in the following ratio: 6-2,5 mm 15-25 wt.%, 2.5 to 1 mm 15-35 wt.%, less than 1 mm up to 100 wt.%, and briquetting is carried out at a pressure of 5 to 90 MPa; as a binder used lignosulfonate or sodium salt of methylenephosphonate that can be modified 10-30 wt.% kovovymi the residues of the distillation of tall oil. 1 C.p. f-crystals.

The invention relates to the technology of briquetting coke breeze, coke dust and sludge, in particular the production of coke briquettes. These briquettes can be used as an energy source, a reducing agent for the electrothermal production of phosphorus, iron production, art is SS="ptx2">

A method of obtaining coke briquettes, comprising a mixture of coke breeze with liquid bitumen, in which pre-add 4-6 wt. coke dust, then mixed with the modified 10-20 wt. powder urea concentrate the sulfite-alcohol stillage, briquetting the mixture on welceom press at pressures up to 20 MPa and the subsequent heat treatment of the briquettes at 500-600oC for 20-30 min, using coke breeze with a particle size of 5 mm and coke dust with a particle size: 0,05 10% 0,025-0,05 25% 0,01-0,025 35% and 0.025 30% [1]

The disadvantage of this method is associated with the complexity of implementation in practice, the exact ratio of these sizes of particles of coke dust.

The closest technical solution is known a method of obtaining a coke briquettes, comprising mixing the fines with a particle size: 3 mm to 20% of 0.5 mm 30-35% and 0.2 mm 50-75% binder based on the derived sulfonic acids (liquid or powdered lignosulfonate ammonium or calcium) in an amount of 3-10 wt. briquetting the mixture at a pressure of 100-200 MPa and subsequent heat treatment of the briquettes at 200-700oC for 10-120 min [2]

The disadvantage of this method are significant capital costs associated with installation of the press is the efficiency of the installation, as well as the compaction of the briquette leads to a significant reduction in its reactivity.

The invention solves the problem of reducing power consumption in energy production, reduce capital costs, increase productivity, improve quality indicators: reactivity, resistance to water, calorific value.

This task is solved in that in the proposed method, including the mixture of coke breeze with 3-10 wt. binder based on the derived sulfonic acids, briquetting the mixture, and subsequent heat treatment at 200-700oC for 10-120 min, for use mixing coke fines with a particle size in the following ratio: 6-2,5 mm 15-25 wt. 2.5 to 1 mm 15-35 wt. less than 1 mm to 100 wt. and briquetting is carried out at a pressure of 5 to 90 MPa; as a binder use derivatives of sulfonic acids, which can be modified 10-30 wt. kovovymi the residues of the distillation of tall oil.

The specified ratio of the particle size of the coke breeze, modified lignosulfonate, pressure, temperature, and time provide irreversible thermo-chemical reaction of the modified lignosulfonate in an environment of coke, which in turn will allow the floor the BA can be used derivatives of sulfonic acids, for example, technical lignosulfonates with different bases (ammonium, potassium, sodium, magnesium or sodium salt of methylenephosphonate modified kovovymi the residues of the distillation of tall oil, or oxidized tall oil pitch. The softening temperature of saponified tall oil pitch 50-55oC, oxidized tall oil pitch 94oC. modifying derivatives of sulfonic acids tall oil pitch simultaneously with the improvement of the water resistance increases and binding capacity.

Example. 1. As a source of raw materials used 10 kg of coke breeze with particle size: 6-2,5 mm 15 wt. 2.5 to 1 mm 15 wt. < 1 mm 70 wt. the moisture content of 8-9%

As a binder used 50% concentrate of lignosulfonate (sodium base), dry weight is 1 kg (10 wt.). Coke breeze stirred with lignosulfonate in the mixer type "Tornado".

After mixing, the mixture is fed to the briquetting in Wallaby press, where at a pressure of 90 MPa, the mixture is formed into briquettes pincushion shape size HH see Beyond the bricks get in the guides on the surface continuous hinge chain specially equipped conveyor, which passes through thermotime is 120 minutes

Next, the resulting coke briquettes on cooling trays are moved into the hopper. The obtained coke briquettes have a moisture content not more than 1-1,5% of the density of 1.25-1.3 g/cm3the ash content of 12-13% compressive strength not less than 80 kg/cm2the strength of the dropping of the residue on the sieve +25 mm 98-99% good thermal stability, as when burned to complete combustion retain their shape, good resistance to moisture, good reactivity.

Example 2. As a source of raw materials used 10 kg of coke breeze to sieve composition 6-2,5 mm to 20 wt. 2.5 to 1 mm to 20 wt. < 1 mm 60 wt. the moisture content of 8-9%

As a binder used 50% lignosulfonate (sodium base), modified saponified tall oil pitch, dry weight of lignosulfonate is 0.5 kg (5 wt.), peck 0.05 kg (10 wt.). The modification process was carried out by mixing the powdered lignosulfonate saponified tall oil pitch. Coke breeze stirred with modified lignosulfonate in the mixer type "Tornado".

After mixing, the mixture is fed to the briquetting in Wallaby press, where at a pressure of 20 MPa, the mixture is formed into briquettes pincushion shape size HH see Further briquette which passes through the heat chamber defined therein heating Elements, where is the heat treatment of the briquettes at a temperature of 300oC for 30 minutes

Next, the resulting coke briquettes on cooling trays are moved into the hopper. The obtained coke briquettes test results have humidity not more than 1-1,5% of the density of 1.25 g/cm3the ash content of 12-13% compressive strength not less than 90 kg/cm2the strength of the dropping of the residue on the sieve +25 mm 98-99% good thermal stability, as when burned to complete combustion retain their shape, good resistance to moisture, good reactive ability.

Example 3. As a source of raw materials used 10 kg of coke breeze to sieve composition 6-2,5 mm 25 wt. 2.5 to 1 mm 35 wt. < 1 mm 40 wt. the moisture content of 8-9%

As a binder used 50% lignosulfonate (sodium base), modified oxidized tall oil pitch, dry weight of lignosulfonate is 0.5 kg (5 wt.), peck 0.15 kg (30 wt.). The modification process was carried out by mixing the powdered lignosulfonate oxidized tall oil pitch. Coke breeze stirred with modified lignosulfonate in the mixer type "Tornado".

After mixing, the mixture is fed to the briquetting in VA is e briquettes are received in the guides on the surface continuous hinge chain specially equipped conveyor, which passes through the heat chamber defined therein heating Elements, where is the heat treatment of the briquettes at a temperature of 700oC for 10 minutes

Next, the resulting coke briquettes on cooling trays are moved into the hopper. The obtained coke briquettes test results have humidity not more than 1-1,5% of the density of 1.15 g/cm3the ash content of 12-13% compressive strength not less than 70 kg/cm2the strength of the dropping of the residue on the sieve +25 mm 95-96% good thermal stability, as when burned to complete combustion retain their shape, good resistance to moisture, good reactive ability.

Examples 4, 5, 6 are respectively from examples 1, 2, 3 that is used as a binder sodium salt of methylenephosphonate.

Thus, implementation of the proposed method of manufacture of coke briquettes from coke breeze provides in comparison with the known method the reduction of initial capital and operating costs. Reduced energy costs, emissions, increased performance, expanded scope, improve the consumer properties of the briquettes.

1. How palpability, the briquetting mixture and subsequent heat treatment of the briquettes at 200 700oC for 10 to 120 min, characterized in that for use mixing coke fines with a particle size in the following ratio: 6,0 2,5 mm 15 25 wt. 2,5 1,0 mm 15 35 wt% and less than 1 mm to 100 wt. briquetting is carried out at 5 to 90 MPa.

2. The method according to p. 1, characterized in that the binder used lignosulfonate or sodium salt of methylenephosphonate modified 10 to 30 wt. supplements bottoms of the distillation of tall oil.

 

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