RU2186823C2 - Method of preparation of coal charge for coking - Google Patents

Abstract

FIELD: production of coke; by-product coke industry. SUBSTANCE: proposed method includes crushing, metering, mixing coals, introducing wastes of by-product coke process which are applied on rubber crumb of rubberized articles and additive thus obtained is introduced in charge in place of some coals at coals of gas-fat and -fat ranks to coals of -coke, lean-sintered and coke weak-sintered ranks to additives equal to (0.28-0.20):(0.70-0.74): (0.02-0.06). Rubber crumb of rubberized articles may be modified by treatment with wastes of by-product coke process and may be mixed with coke dust of coke dry quenching plant at ratio of 1:1:3 to 3:1:1, after which it is introduced in charge as additive. EFFECT: increased yield and improved quality of coke; enhanced mechanical strength of coke; extended raw material resources base; utilization of industrial carbon-containing viscous-flow coking wastes. 2 cl, 3 dwg

Description

 The invention relates to the production of coke, in particular to a method for preparing a coal charge for coking.

A known method of preparing a coal charge for coking, including crushing, dosing, mixing coals, separating fractions of a charge of coals of less than 1 mm, introducing a binder into it, dividing the coal charge into layers, introducing coal fuser between the layers of the coal charge, briquetting. The mixture obtained by crushing, dosing and mixing various coals of the composition,%: G-31, GZH-32, Zh-9, K-9, OS-19, mixed with briquettes (30 wt.% To the mixture), subjected to coking, get coke with a strength of P ₂₅ - 87.7%, P ₁₀ - 8.4% [US Pat. RU 1490133 A1, MKI ⁴ C 10 V 53/08; C 10 L 5/14; 12.22.86, Gulyamov Yu.M., Panchenko N.I., Balabanov V.A. and others. A method of preparing a coal charge for coking, BI 24, 1989].

 The disadvantages of this method are: the inability to stabilize the quality of the mixture due to the lack of dosing of tar containing waste, multi-operation technology with a briquetting stage, high production costs.

The closest in essence and the achieved result is a method of preparing a coal charge for coking, including crushing, dosing, mixing coal, separating fine fractions, introducing a binder - phthalopaque-containing waste into the charge. Before dosing, gas, fatty and lean sintering coals are separately accumulated, collectively and layer by layer in a ratio of 3: 1 they accumulate low-ash low-sintering ordinary coals and phthalic acid-containing wastes, each component is certified for ash, the output of volatile substances, gas, fatty, lean sintering and low-ash coal are dosed with phthalopec-containing wastes in the ratio (0.3-0.4): (0.55-0.58): (0.04-0.06), respectively. [Pat. RU 2135543 C1, MKI ⁶ C 10 V 53/08; 57/08 Khamidulin F.Z., Gainieva G.R., Pyankov B.F. and others. A method of preparing a coal charge for coking. BI 24, 1998].

The disadvantages of the method: only solid waste under normal conditions (t - 20-28 ^o C) is disposed of: precipitation from the bins of the resin processing shop with a softening point of 91 ^o C; pitch sediments of the chemical recovery shop with a softening point of 71 ^o C; still bottoms of the phthalic anhydride workshop with a melting point of 137-145 ^o C. Viscous flowing waste from the coke production is not disposed of, the yield and quality of coke does not increase.

 The objective of the invention is to increase the yield and quality of coke, increase its mechanical strength, reduce the cost of coke production, expand the coking raw material base, and utilize industrial carbon-containing viscous-flowing coking wastes.

This goal is achieved in that the method of preparing a coal charge for coking, including crushing, dosing, mixing the coals, introducing waste by-product of coke production according to the invention is characterized in that the waste of coke production is applied to rubber-containing crumbs and the obtained additive is introduced into the charge to replace part of the coal when the ratio of coals of grades GZH, Zh: coals of grades K, OS, KS: additives equal to (0.28-0.20): (0.70-0.74): (0.02-0.06). At the same time, the crumb of spent rubber products is modified by treating the waste of chemical plants of KHP, USTD dust in a ratio of 1: 1: 3 for 0.5-1.0 hours at a temperature of 20-30 ^o C. As the waste of coke production are used: coke dust, fus condensation compartments, sediments from cleaning coal tar storages, tar fraction storages, sediment from transportation and storage of pitch, polymers of the benzene compartment, pressing outflows, tarry waste from a biochemical plant, substandard coal tar, sediment from ammonia columns and storages of ammonia water, etc. (tab. 1).

 The characteristics of rubber crumb are presented in table. 2.

The technical result achieved using the proposed method is as follows:
- increases the yield of metallurgical coke, increases its mechanical strength;
- reduced the cost of the charge for the production of coke, and therefore, the cost of coke;
- expanding the possibility of using coking low-sintering coals due to sintering components of the additive (tar, pitch waste);
- reduced consumption of scarce coking coal;
- the raw material base of coking is expanding;
- disposed of viscous flowing waste KHP, coke dust USTK and waste rubber products.

 Verification of compliance of the claimed invention with the requirements of novelty was carried out taking into account all published inventions, technical and informational literature, and other sources. Comparison of the claimed technical solution with the prototype made it possible to establish its compliance with the criteria of the invention of "novelty."

 The significance of the distinctive features is achieved by replacing part of the coal in the charge with coking of industrial waste (used rubber, waste from chemical and coke shops of coke production), which makes it possible to expand the coking raw material base. The set of essential features: the properties of the sintering additive, determined by the physicochemical properties of rubber and waste, the percentage ratio of all components of the charge - allows us to solve the problem, which indicates the significant differences between the proposed invention and its satisfaction with this criterion.

 Signs that distinguish the claimed method from the prototype were not identified in other technical solutions when studying this area and provide the claimed solution with the criterion of "inventive step".

 A new technical result of the claimed method is a comprehensive large-scale disposal of all types of carbon-containing, including and viscous fluid waste in the existing coke production; in increasing the yield and quality of coke and increasing the yield of valuable chemical coking products - benzene, coal tar, increasing the proportion of low-caking coals in the charge for coking, the technology allows to obtain bulk material convenient for introduction into the coal charge.

 Examples confirming the proposed method of preparing a coal charge for coking are presented in table. 1, 2, 3.

Wastes of coke production (Table 1) were mixed with rubber crumb of spent rubber products (Table 2) with a fractional composition of 0-2.5 mm in a laboratory ball mill under normal conditions (t 20-30 ^o C) for 0.5-1 , 0 h with the addition of dust from the dry coke quenching unit (CTP) with the ratio of rubber crumb: waste from chemical shops: coke dust of the CCP equal to 1: 1: 3-3: 1: 1 (examples 1-9). Since an additive with a ratio of components of 3: 1: 1 increases the yield of volatiles of the mixture, the optimal ratio of components is taken 1: 1: 3.

When the mixing time is less than <0.5 h, the state of uniformity of the mass of the additive to the mixture is not achieved, the mixing time of more than 1 h is impractical - the mass of the additive does not change its state of aggregation, at temperatures above 30 ^o C there is an aggregation of rubber crumb and the modifying agent into large conglomerates > 5 mm.

 The tests were carried out by coking the base and experimental charges in a laboratory furnace with a charge of 2 kg in accordance with GOST 9521-74. The basic charge was composed of the components of the production coal charge of ZSMK OJSC. As test material, we used tire crumbs with a grain size of 0–2.5 mm, which was modified by mixing with waste from coke production and introduced into the coal charge instead of part of the coal component in an amount of 2 to 7 wt.%.

 Studies of the quality of the components of the charge, charge and coking products were carried out in accordance with existing methods: technical analysis GOSTs - 11014-81, 27589-91, 11022-95, 6382-91, 8606-93; plastic analysis of GOST 1186-87; elemental analysis GOST 27044-86, 24082-75; determination of coal coking ability GOST 9521-74; yield of coking chemicals GOST 18635-73.

 The results of the joint coking of coal, KHP waste, rubber crumb and coke dust USTK are presented in table. 3.

These data show that from the mixture composition: coals of grades GZh, Zh: coals of grades K, OS, KS: additive = 0.28-0.20: 0.70-0.74: 0.02-0.06, obtained coke, in yield and quality superior to coke from a gas mixture (examples 11-14). Coke from experimental blends was characterized by the following quality indicators: the output of gross coke was 78.3-78.7%, the yield of classes: +40 mm 77.1-80.0%, +25 mm - 92.0-94.3%, mechanical strength in terms of P ₂₅ and P ₁₀ was 89.6-93.7%, 6.0-6.6%, respectively, structural strength - P _s - 89.7-92.7% (examples 12-14).

 With an increase in the additive in the charge up to 7%, the coke quality indicators deteriorate (examples 15, 16).

 The yield of chemical coking products increased: resin and crude benzene (examples 11-14).

 Consequently, coke obtained from blends with a ratio of components: (coals of grades GZh, Zh): (coals of grades K, OS, KS): (additive) equal to (0.28-0.20): (0.70-0 , 74): (0.02-0.06), in terms of quality, it meets the requirements of the standards, with an increase in the output of gross coke, coke of classes +40 mm, +25 mm.

 The development of the claimed method will allow: qualified disposal of rubber-containing and coke-chemical wastes on site, reduce capital and operating costs for their disposal, increase the yield and quality of coke, reduce the cost of its production and the consumption of scarce coal. The economic effect of the implementation will be 4242 thousand rubles / year.

 The claimed method is industrially applicable at coke plants in the preparation of a coal charge for coking for the production of metallurgical coke.

Claims (2)

 1. A method of preparing a coal charge for coking, including crushing, dosing, mixing the coals, introducing wastes of coke production into the charge, characterized in that the waste of coke production is applied to the rubber crumb of spent rubber products and the additive obtained is introduced into the charge to replace part of the coal with the coal ratio grades GZh, Zh: coals of grades K, OS, KS: additive equal to (0.28-0.20) :( 0.70-0.74) :( 0.02-0.06).  2. The method according to claim 1, characterized in that the rubber crumb of waste rubber products is modified by processing by-product of coke production and mixed with coke dust from a dry quenching unit in a ratio of 1: 1: 3-3: 1: 1.

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