KR100228221B1 - Preparation of formed coke - Google Patents

Abstract

The present invention is a mixture of 60-70% by weight of powdered coke, 0-30% by weight of coal, 0-30% by weight of hard coal and 0-30% by weight of weak coal, pressure of 100-150kg / cm2 at 400-600 ° C. After molding to a molten metal, the present invention relates to a method for producing molded coke having excellent strength, characterized in that it is dried in an inert atmosphere.

Description

Manufacturing method of molded coke

The present invention relates to a method for producing molded coke, and more particularly, to a metallurgical and foundry coke by selectively adding a predetermined binder to the powdered coke produced in large quantities during steelmaking coke and molding under appropriate molding conditions. It relates to a manufacturing method.

Molded coke is formed into a certain shape and size by mixing an appropriate amount of coking coal, coal tar, pitch, heavy oil and other synthetic binders with con-caking coal or weakly-caking coal or powdered coke. Refers to the coke that has been dried.

The quality of the molding coke varies greatly depending on the manufacturing conditions, that is, the type and mixing ratio of the raw materials, the molding temperature, the molding pressure, and the drying conditions (temperature, atmosphere).

Japan's DKS method (Source: European Communities Report) cold forming by mixing 10% pitch and tar as caking material in 5-10% coking coal, 70-85% low volatility coal and 0-10% powdered coke. After that, the method of distilling at 1250-1300 ℃ is adopted.

Japanese Patent Publication No. 54-27001 discloses a method in which heavy petroleum hydrocarbons are mixed with 15% of volatile coal, petroleum coke and anthracite coal, molded at 149 ° C. and 34 kg / cm 2 and dried for 8 hours at 800 ° C.

In addition, Republic of Korea Patent Application No. 89-10063 is mixed with tar sludge in the powdered coke was heated for about 1 hour at 200 ℃ and then molded at a pressure of 150㎏ / ㎠ for 2-3 hours at 700-900 ℃ A method of carbonizing is described.

In order to use the molded coke instead of the existing blast furnace coke, the physical and chemical properties such as strength, abrasion resistance, density, and reactivity of the molded coke should be the same level as those of the conventional coke, and in particular, the molded coke is used for the blast furnace. In order to do so, it is known that high strength must be secured compared to existing blast furnace coke. However, the above known techniques could not produce a molded coke particularly excellent in strength compared to the blast furnace coke.

It is an object of the present invention to provide a method for producing molded coke with good strength.

In the method for producing molded coke of the present invention, coal pitch as a binder is mixed with powdered coke, weak coal and hard coal, and heated to 400-800 ° C., while applying a pressure of 50-150 kg / ㎠ at this temperature. It is characterized by consisting of a step of molding for about 30 minutes-1 hour, and drying the molded body for 1 hour to 2 hours in an inert atmosphere of 800-1000 ℃.

Hereinafter, the present invention will be described in detail.

The powdered coke used in the present invention preferably has a particle size distribution of 35 mesh or less as the powdered coke produced by the production of steel coke. Therefore, CDQ powdered coke having a large specific gravity of particles having a particle size distribution of 35 mesh or less among the powdered coke produced in steelmaking coke is most preferred. In the manufacturing of steel coke, coke powder produced in this range is selected as a standard body to have a uniform particle size distribution.

The hard coking coal used in the present invention acts as a caking material as well as a carbon material, because in the case of coking coal provides a caking force while fluidized at 400-600 ℃. The strong and weak coals preferably have a particle size distribution of 100 mesh or less.

In addition, even when only coal pitch is used as a binder without using strong coking coal, the effect of promoting the bonding of carbon materials by the high temperature press molding was very significant.

The raw material of the present invention is characterized by consisting of 60-70% by weight of coke, 0-30% by weight, 0-30% by weight of hard coal and 0-30% by weight of weak coal, and when mixed in this configuration It shows better strength. In the case of adding hard coal or pitch alone, when the binder content is about 30% by weight, the crush strength is the best and the reactivity reaches the general coke level. Moreover, when using pitch and hard coking coal together, it is preferable to add so that the weight of the pitch and hard coking coal may be 30 weight%. For example, when adding pitch and hard coking coal together, 10 weight% of hard coking coal may be added to 20 weight% of pitch, but when adding weak coking coal instead of strong coking coal, 20 weight% of weak coking coal. It is only necessary to add the desired crush strength and reactivity.

According to the shaping | molding method press-molded at 400-600 degreeC high temperature employ | adopted by this invention, the shaping | molding coke which has the intensity | strength which is much more excellent than the normal temperature pressurization can be manufactured.

The effects of the present invention will be described in more detail through examples.

Example 1-4

The weak coke and the hard coking coal were mixed with the coke as a base material in the composition of Table 1 below. The powdered coke used as coke produced in steelmaking was -36mesh (0.42mm) in particle size, and weak coal and strong coking were -100mesh (0.149mm) and used as standard. The coking coal used is coal with 17% volatiles and 6.94% ash, and weak coal with 34.8% volatiles and 7.4% ash.

These carbonaceous raw materials were sufficiently mixed in a powder mixer for 1 hour, and then coal pitches were mixed by weight and mixed while heating to 70 ° C-80 ° C. The mixture was heated to a temperature of 500 ° C. and press molded at a pressure of 100 kg / cm 2 for 1 hour. The specific gravity and porosity of the molded coke after drying for 1 hour at 800-900 ° C. were measured and the results are summarized in Table 2 in comparison with the general coke. Similarly, the collapse strength (kg / ㎠) and reactivity was also measured and the results are shown in Table 2. Reactivity was calculated as 100% after making it react for 2 hours by the flow volume 51 / min of CO2 at 1100 degreeC (weight loss / initial weight).

[Comparative Example 1-4]

The carbonaceous material of the same composition as in Example 1 was sufficiently mixed in a powder mixer for 1 hour, and then coal pitch was mixed by weight and mixed while heating to 70 ° C-80 ° C. The mixture was press molded for 1 hour at room temperature at a pressure of 100-150 kg / cm 2.

Specific gravity, porosity, crush strength (kg / cm 2) and reactivity of the molded coke prepared after drying for 1 hour at 800-900 ° C. were measured in the same manner as in Example 1, and the results are shown in Table 3.

As can be seen from the results of Tables 2 and 3 of the Examples and Comparative Examples, the specific gravity and the porosity of the molding coke vary greatly depending on the molding pressure and the molding temperature, in particular, the molding temperature. In the case of the molding, the apparent specific gravity is 0.9-1.0 g / cm 3 lower than that of ordinary coke and the porosity is 30-40%, which is much larger than that of ordinary coke. On the other hand, the coke formed at 500 ° C has an apparent specific gravity of about 1.2, which is higher than that of ordinary coke, and the porosity is about 19-22%, which is lower than that of ordinary coke.

The breakdown strength and reactivity of the molded coke for the mixing of raw materials and various molding conditions are as follows. The molded coke molded at room temperature shows much lower collapse strength than ordinary coke even if the molding pressure and time, dry distillation temperature and time are changed. As a result, the coke quality is very weak. On the other hand, when the molding temperature is 400-600 ° C., the crushing strength is about 2 times higher than that of the general coke at a molding pressure of 100 kg / cm 2 or more, and the reactivity is also similar to that of the general coke as 49-55%.

On the other hand, the component analysis results of the molded coke prepared by the present invention is shown in Table 4, which is a level satisfying the metallurgical coke quality standard.

Such a method for producing molded coke according to the present invention is a method capable of producing molded coke having high strength and proper reactivity required as metallurgical coke and satisfying quality standards.

Claims (1)

With respect to 60-70% by weight of coke, at least one or more kinds of coal pitch 0-30% by weight, hard coal 0-30% by weight and weak coal 0-30% by weight are optionally mixed at 100-150 ° C. After molding at a pressure of kg / ㎠, dried coke in an inert atmosphere, characterized in that the manufacturing method for forming coke.