Method of obtaining high-quality coke

FIELD: chemistry.

SUBSTANCE: invention relates to method of obtaining high-quality coke by application of borate on red-hot coke after discharge from coke furnaces with temperature 1050±50°C, with its extinguishing being carried out with water solution of borates with content of borates 3-10 g/dm3 in form of solution or pulp in quencher car under quenching tower for 90-120 sec, with tetraborate sodium pentahydrate, borax decahydrate, disodium octaborate tetrahydrate being used as borates.

EFFECT: increased quality of blast furnace coke by parameter of hot strength after reaction with CO2 and reduction of its reaction ability.

1 dwg, 3 tbl

 

The invention relates to the field of coke and blast-furnace production.

In modern production quality blast furnace coke must meet the requirements of the international standard ASTM: D5341-99 indicators CSR coke strength after reaction with CO2and CRI - reactivity.

In the production of coke improve its mechanical strength, mainly achieved through methods based on the preparation of the coal charge for coking by varying its vintage composition, compacting, briquetting, heat treatment and processing of various organic and inorganic additives, etc., However, the effectiveness of such technologies unsatisfactory due to the limited choice of coal grades, according to the measure of the strength of coke on the quality of applied charge, unsatisfactory ratio of the reactivity and strength of the obtained coke, etc.

More effective in this sense, technology improvements CSR and CRI by chemical processing of finished coke.

A method of processing blast furnace coke by applying a borate to pieces of metallurgical coke, characterized in that after discharge from the coke oven, stewing and sorting pieces of metallurgical coke having a temperature of 20-50°C, are treated by spraying with 2-20% aqueous solution of borate selected from the range: Tetra is oral sodium, the potassium tetraborate, calcium tetraborate, and for processing apply this solution volume to the amount of dry borate in the coke answered from 0.2 to 0.50% (wt.) in terms of Cox (RF patent 2336297 C1 IPC C10L 9/10, priority 05.07.2007).

The disadvantages of the known method of processing of metallurgical coke are:

- do not use heat of hot coke to melt borates on the surface of the coke with the improvement of its quality at the stage of quenching, an aqueous solution of borate on a cold coke not chemisorbents on the surface of the coke, and the moisture content in the blast furnace coke is regulated for class +40 mm - 5% to +25 mm - 6%. Re-wet processing of coke only reduces its quality;

not ensuring uniformity of treatment of all pieces of coke in the stream due to the lack of evaporation;

- the need for additional stages of secondary metallurgical coke in the stream after the stage of fighting.

Known way to improve the quality of metallurgical coke, comprising spraying at temperatures below 20°C to pieces metallurgical coke 2-20% aqueous solution of borate metal selected from the range of: sodium, potassium, calcium, containing 0.1-0.2 wt.% nonionic surfactants in the form of mono - and/or dialkylamino esters of polyethylene glycol in an amount to provide the content of the surfactant in Kok is e 0,0035-0,0070 wt.%, and as Borat metal selected from the range of: sodium, potassium, calcium ,use pentaborate one of the metals, and the solution is used in an amount to provide a dry content of pentaborate in the coke and 0.09-0.68 wt.% (RF patent 2445348 C1 IPC C10L 9/10, priority 21.03.2011).

The disadvantages of this method of processing of metallurgical coke are:

- do not use heat of hot coke to melt borates on the surface of the coke with the improvement of its quality at the stage of fighting;

- the need for additional stages of secondary metallurgical coke in the stream after stage fighting;

not ensuring uniformity of treatment of all pieces of coke in the stream due to the lack of evaporation;

- the complexity of the technological scheme of preparing and maintaining the concentration of the solution of borates and mono - and/or dialkylamino esters of polyethylene glycol.

Closest to the proposed method, the essence and the achieved result is chosen as the prototype of a method of processing blast furnace coke, which comprises applying to hot pieces of coke (t≥850°C) fine particulate inorganic compounds by spraying with a preheated gas stream (GB 1423187, publ. 28.01.1976, IPC C10L 5/00). According to a known method as inorganic compounds for the deposition of coke used boric to the slot or borates. When this happens deactivating coke in the reaction with oxygen (O2) and carbon dioxide (CO2) due to the formation of high temperature protective film from molten borate on the surface of the pieces of coke.

The disadvantages of this method are:

- the need for additional stages of secondary metallurgical coke after stage fighting;

lack of efficiency technologies, which is reflected in a slight decrease in reactivity (CRI) and a slight increase in the coke strength after reaction (CSR);

- economiccost technology, because the process of education on the coke surface protective film requires a high temperature (≥850°C);

- the complexity of the hardware design process of applying inorganic substances coke, heat treatment and monitoring the progress of the protective film on coke (the application of gas nozzles, spray powder borates, high temperature reactors, control devices, etc.);

- increased risk for the environment and health personnel use fine solid boric acid or borates at high temperatures.

The task to be solved by the invention, is to improve the quality of domain Kok is and the level of hot strength after reaction with CO 2(CSR) and reduce its reactivity (CRI) within the existing technology wet quenching.

The problem was solved due to the fact that the method of obtaining high-quality coke, coke with a temperature of 1050±50°C after discharge from the coke oven into the quenching car is quenched with an aqueous solution of borates with the content of 3-10 g/DM3borates (sodium tetraborate pentahydrate, borax desativada, disodium octaborate tetrahydrate) in the form of a solution and the pulp within 90-120 seconds directly into the quenching car, under the quenching tower.

To dissolve borates used process water with a temperature of 70-90°C.

Borates contained in the form of a solution and the pulp, when fighting first melted on the surface of the hot coke and the subsequent quenching remain in the pores and cracks of coke. Processed in the quenching car coke after extinguishing dissipates into classes with obtaining metallurgical coke.

It was established experimentally that the pore volume of a typical metallurgical coke wet quenching an average of 8.1*10-3ml/g (coke and chemistry. 2012. No. 1. S. 18-27). After filling in pores and cracks of coke borates with the formation of the solid film of glaze on the walls of the pores, cracks and the surface of the piece of coke pore volume decreases on average 2.3 times and is 3.5*10-3ml/year Thus, the volume, filled the reagent, is 4.6*10-3ml/g or 7.9*10-3g aqueous sodium tetraborate per 1 g of coke (10 kg per 1 ton of coke).

Theoretically, this corresponds to the value of the content of borates 2.5 g/DM3solution for quenching coke.

Practically in terms of production and taking into account losses optimal content of borate in aqueous solution in the processing of coke defined 3-10 g/DM3.

The content of the borate in aqueous solution of less than 3 g/DM3not enough to create a protective layer on the pore walls, cracks and the entire surface of the piece, and improve CSR and CR1 is not observed.

The content of the borate in aqueous solution over 10 g/DM3technologically and economically feasible.

Coke quenching water containing 3-10 g/DM3Borat in the form of a solution and the pulp is made within 90-120 sec. This time is enough to fill all of the pores of the coke with an aqueous solution of borates with the creation of the protective layer and reducing the temperature of the coke.

The claimed method of producing high quality coke implemented as follows (see diagram producing high quality coke with water and borate).

From sump 1 quenching tower 3 into the container 5 mixing pump hot water with a temperature of 70-90°C. In the tank hopper 7 with dispenser 6. From the hopper the powder borate (sodium tetraborate pentahydrate, borax Desyatov is DNA, disodium octaborate tetrahydrate) is served by the dispenser into the container for mixing and dissolution. The mixing of the water in the tank is performed by supplying steam into the lower part. The solution from the upper part of the vessel flows into the sump 1 quenching tower 3 and the pump 2 is fed to the quenching car 4 for quenching coke. The content of borates in the water sump is maintained at the level 3-10 g/DM3in the form of a solution and pulp.

In the process of quenching water containing 3-10 g/DM3Borat in the form of a solution and pulp, borates melted on the hot surface of the coke, and upon further cooling of coke solution of borates uniformly covers the surface of a piece of coke and penetrates into the pores and cracks. Such a protective layer reliably prevents the penetration and influence of oxidizing gases coke, accordingly reducing the reactivity index CRI and increasing measure of the strength of CSR blast furnace coke.

The claimed method of producing high quality coke with a temperature of 1050±50°C in the quenching car when its fighting in the quenching tower water containing 3-10 g/DM3Borat in the form of a solution and the pulp within 90-120 sec tested at Chelyabinsk plant for the production of chemical products" (LLC Mechel-coke") and JSC "muskox".

After sieving coke fractions were identified quality indicators CSR and CRI of metallurgical coke according to the andartu ASTM: D5341-99.

In tables 1-3 presents the test results of metallurgical coke. As can be seen from tables with relatively low levels of CSR and high performance CRI initial metallurgical coke coke quenching water containing 3-10 g/DM3Borat in the form of a solution and slurry, directly under the current production:

to increase the coke strength after reaction with CO2(CSR) 9.4 to 13.1% (Rel.);

to reduce reactivity (CRI) 5.3-11,9% (Rel.);

to improve the efficiency of the process by simplifying the processing of coke inorganic additive, which occurs when its fighting in conditions of high temperatures to produce a protective film;

to improve the efficiency of the process of smelting iron through the use of higher quality coke indicators of CSR and CRI, which allows to reduce the coke consumption for production of 1 ton of iron and reduce its cost.

The proposed method for obtaining high-quality coke differs from analogues that coke to a temperature of 1050±50°C after issuance of the furnace is quenched in the quenching car aqueous solution of borates with the content of 3-10 g/DM3in the form of a solution and slurry. When processing coke with plenty of water (4 m3per ton of coke) is filling all pores of the coke solution and pulp borates, then the water evaporates under the effect of high t is Imperator coke (1050±50°C), and borates remain in the pores of the coke. The temperature of the coke at the end of quenching is reduced to ~250°C.

Processing coke aqueous solutions of borates allows you to get the coke, which meets the international standards on quality indicators CSR>55-70% and CRI≤30-22 per cent, of coke, with moderation, and, accordingly, to expand the raw material base of coking.

Table 1
Quenching coke 10-water sodium tetraborate (N2B4O7-10 H2O)
Name OF,Concentration, g/DMThe quality of coke
The composition of the charge, %
Pecor-
Skye 2ZH
Tomusinskaja TO+OSSiberia OS+KSNeryungri K(2K)KDM 25, %M 10, %CRI, %CSR, %
403510105- 87,68,5of 31.8of 54.8
40351010510at 88.18,028,062,0
403510105388,47,830,059,0
*KD - katsoudas additive

Table 2
Quenching coke 5 water sodium tetraborate (N2B4O7-5H2O)
Name OF,Concentration, g/DM3The quality of coke
The composition of the charge, %
The collapse of the sky GZHBlacksmith-Kai GZH+W Tomusinskaja TO+KSSiberia OSNeryungri K(2K)KDM 25, %M 10, %CRI, %CSR, %
20202515155-86,58,935,548,9
202025151555,086,98,632,753,6
202025151557,086,58,032,054,5
*KD - katsoudas additive

87,5
Table 3
Coke quenching disodium octaborate the tetrahydrate (Na2B8O13-4H2O)
Name OF,Concentration, g/DM3The quality of coke
The composition of the charge, %
Taibinskaya, GZHPecor-
Skye, W
Tomasin Skye TO+KSDerujinsky, GZHNeryungri K(2K)KDM 25, %M 10, %CRI, %CSR, %
5163329116-84,59,235,548,0
516332911610,07,931,554,0
51633291163,086,58,333,652,5
*KD - katsoudas additive

The method of obtaining high-quality coke by applying Borat at the red-hot coke, characterized in that after the issuance of a hot coke from the coke ovens in the quenching car with a temperature of 1050±50°C quenching is conducted with an aqueous solution of borates with the content of 3-10 g/DM3in the form of a solution and pulp in the quenching car under the quenching tower for 90-120 seconds, at the same time as borates use sodium tetraborate pentahydrate, borax desativado, disodium octaborate tetrahydrate.



 

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