KR850001108B1 - Compsoition of binder for cokes - Google Patents

Abstract

Binder composition used in the manufacture of casting coke briquettes is prepared from pitch melt and coal tar by mixing and reforming the substances in the ratio of 1:1 or 2:3 to 60≰C. The pitch oil is a concentrate discharged from the absorbing oil used in light oil recovery from coke gas. The produced binder has a 25-44≰C softening point, less than 35% fixed carbon, more than 65% volatile matter, less than 0.12 % ash, less than 16% T.I., and less than 3% Q.I.

Description

Method for preparing a caking additive for the production of lump coke using casting oil and coal tar

The accompanying drawings are a schematic diagram of a apparatus for producing a lump coke for casting as a caking additive of the present invention.

* Explanation of symbols for main parts of the drawings

1: raw material storage tank 2: grinder

3: binder mixture liquid 4: mixer

5: coal tar tank 6: pitch oil tank

7: Coal tar transfer pump 8: Pit oil transfer pump

9: binder mixing tank 10: kneading machine

11: molding machine 12: dry distillation furnace

13: water cooler 14: water equipment

15: Cyclone and wet scrubber 16, 17, 18: conveying conveyor

The present invention relates to a method for preparing a binder used to prepare powdered coke of fine particles generated in the steel industry, again, as coke coke for casting.

In general, in order to manufacture the powdered coke of the fine particles generated in the steel industry as the coke coke again, the coke coke is manufactured by mixing the coke with the caking agent, and the soft pitch is used as the caking agent used here. Is expensive, so it is not economically flawed.

It is an object of the present invention to solve the conventional non-economic defects of the present invention and to provide an economical and effective binder as pit-healing and coal tar generated as by-products in the steel industry.

Pitch oil used in the caking preparation of the present invention is a waste product of washing oil obtained from coal tar in order to recover landscape oil contained in coke gas, which is sprayed from a diesel oil scrubber tower, which is a landscape oil recovery device, It is in constant contact with the rising gas to absorb the landscape oil in the gas.

At this time, the absorbed oil is separated from light oil by steam distillation operation in the distiller, and the absorbed oil is exchanged and cooled again to continuously circulate to the scrubber column top.

At this time, the absorbent oil gradually increases in viscosity from the continuous circulation cycle, and the aging phenomenon occurs that the absorption rate of the landscape oil decreases. In order to prevent this phenomenon, the aging material is concentrated and separated, and the absorbed oil is regenerated and concentrated separated. The material is excreted in water cooling.

The substance excreted from this absorbent oil is called pitch oil, and its properties are shown in Table 1.

TABLE 1

Using the above pit healing to explain the composition of the binder in detail,

In mixing and reforming coal tar generated from pitch oil and coke oven gas in a weight ratio of 1: 1 or 2: 3, the actual ratio is 500g of coal tar or 400g of pitch oil for 1kg of the final composition. 600 g of contar is mixed and reformed to form a binder.

The caking agent of the present invention (pitching oil + coal tar) thus prepared is a caking agent for producing cast coke coke with powdered coke as a main raw material. Is as follows.

TABLE 2

When explaining the embodiment of the goggles coke production using the caking additive of the present invention as described above in detail as follows.

EXAMPLE

First step: Peach milk solution The dry pulverized pit milk lump in the solid state is dried and stirred and heated to about 110 ° C. to become liquid.

Second step: Caking Preparation The first step of the pitch liquid is mixed with a collal liquid in a ratio of 1: 1 or 2: 3, and the entire solution is brought to and after 60 DEG C, thereby achieving good uniformity and completing the composition of the binder.

3rd step: Mixing powdered coke In the second step, the coking agent is added 80-85% of powdered coke as usual, and steam is injected at about 175 ℃, and the content of water is maintained while the mixture is maintained at 60-80 ℃. The mixture is evenly mixed at around 10 ° C.

Fourth step: molding and drying The mixture kneaded in the third step is molded and dried to a certain size in a molding machine to complete a product.

When described in detail by the accompanying drawings, the contents of the goggle coke using the binder of the present invention will be described.

Powdered coke for casting lump coke is generally used without crushing in view of particle size distribution, but for particle size of 25-10mm, it is crushed to 3mm or less by separate grinder (2) and mixed with the whole to be used as raw material.

Raw material is supplied from the raw material storage tank (1) to the mixer (4) in Sazen Yard, and is transferred to the mixing agent (9) by the coaltal pump (7) from the coaltal tank (5) and at the same time already pulverized. In the pit oil tank 6 melted and stored under the conditions, the feed pump 8 also collects in the binder mixing tank 9.

In the present invention, the coke binder of the powdered coke is stored in the binder mixture tank 9 of the coal tar pitch oil stored in the binder mixture tank 9 for use.

These liquids are always maintained at about 60 ° C-80 ° C for good mixing with the powdered coke and good fluidity in the next process, and these binders are charged into the mixer 4 to mix the powdered coke and the binder. 15. Mix thoroughly at 80:20.

At this time, the injection of steam of 175 ℃ to adjust the internal temperature to about 100 ℃ and the required time is about 7 minutes is good.

This mixture is introduced into the next kneader 10 and sufficiently trained carbon powder particles and a binder of the powdered coke in the rotational form of the raw material while maintaining the internal temperature at about 100 ° C. and mixing them as a binder on the surface of the carbon particles. Will be

The raw material mixed from the kneader 10 is transferred to the molding machine 11, where it is press-molded to about 200-2,000 kg / cm 2 in the mold to meet the required shape of the casting coke coke to produce a molding coke.

The molded coke is charged into the distillation furnace 12 by the conveying conveyors 16 and 17. The structure of the main furnace is divided into a distillation chamber and a combustion chamber so as to allow dry operation of the molded powder coke. It can be heated to 500-600 ° C and constructed as a suitable refractory material.

In the present invention, the molded coke charged into the distillation furnace 12 exits the distillation furnace 12 after about 2 hours to 3 hours of the drying time, and the heated forming coke is quenched immediately in the water cooler 13 to the final product. Is conveyed by the conveyor 18 and stored in the product yard.

Water required for quenching takes charge of the profit of the water facility (14). On the other hand, the gas generated in the dry distillation furnace 12 includes soot, etc., which is first treated by the cyclone and the wet scrubber 15 treated with the waste gas, and the treated gas can be used as fuel and burned as necessary. Dissipation can also prevent pollution.

The manufacturing process as described above is somewhat similar to the currently known sexual coke manufacturing process, the present invention is characterized in that for preparing the lump coke for casting from powdered coke as a caking agent and the coagulant formed as pit cure oil additives The experimental coarse manufacturing coke for casting formed from the powdered coke under the above conditions was satisfied as compared with the casting coke sphere, and the results of analyzing the obtained coke coke are shown in Table 3.

TABLE 3

In general, in the manufacture of ingot coke for casting, the basic raw materials are mixed with coarse coal 20-40%, weak coking coal 20-40%, anthracite coal, petroleum coke, and sulfuric compound 20-40%, and pitch 5-15%. In the present invention, the powdered coke is mixed with a binder prepared by mixing and modifying pitch oil and coalta, which are excreted in absorbent oil, so that the powdered coke is manufactured under molding distillation. Therefore, it is economical and has high industrial use value.

Claims (1)

A method of preparing a caking coke for castings using cast oil and coal tar, characterized in that the mixture is modified and reformed by forming pitch 1: 1 or 2: 2.

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