KR20010019319A - Method for cokemaking with wasted tire - Google Patents

Abstract

PURPOSE: A production method of cokes is provided to obtain good strength and quality and recycle wasted tire by means of adding powdery tire as a substitute material without metallic component. CONSTITUTION: A method for preparing cokes with adding wasted tire is performed by using wasted tire powder, instead of weak coking coal having 60 or less of static carbon content and 30 or more of volatiles. The wasted tire has a particle diameter of 4mm or less. The wasted tire is combined into the cokes raw material in a combining rate of 7 or less since the tire powder is converted into liquid state during dry distillation and has good fluidity. Also, the tire powder reacts with other cokes to increase coking coal.

Description

Method for producing coke with waste tires {Method for cokemaking with wasted tire}

The present invention relates to a method for producing coke with the addition of waste tires, and more specifically, coke coke by adding waste tire powder from which metal components are removed by substituting weak coking coal having a fixed carbon content of less than 60 and a volatile content of 30 or more in coking coal. It relates to a coke production method using a waste tire to produce.

Coke, whose main component is carbon, is used as a reducing agent and fuel for reducing and melting iron ore. Steel coke is charged with raw coal into a carbonization chamber of coke furnace, and it is heated at a temperature of 1000 to 1300 ° C in both combustion chambers. Heated and dried to form an off-white hard crystal.

The raw coal used in the manufacture of coke is composed of an active ingredient that melts in dry distillation to promote coal-bonding and an inactive ingredient that does not melt in dry distillate.

In general, raw coal is classified into coal, high coking coal, coking coal, weak coking coal, and non-coking coal having a low content of active ingredient.

The quality of the coke produced is greatly influenced by the content of these coking coals. In the coke manufacturing process, various coking coals are mixed and used in consideration of economical efficiency.

On the other hand, wasted tires are simply incinerated, landfilled or used as civil engineering materials, or they are charged and processed into cement kilns and furnaces without being crushed and cut. Recently, methods of recycling waste tires without simply treating them as wastes have been studied. Among these methods, there is a method of using waste tire components as an additive raw material to prepare coke.

As a technique for producing coke using such waste tires, there are Japanese Patent Laid-Open No. 62-152040 and Japanese Laid-Open Patent Publication No. Hei 1-31296.

Japanese Laid-Open Patent Publication No. 62-142040 discloses a method of injecting waste tires into a coke oven as it is, and Japanese Laid-Open Patent Publication No. 1-131296 discloses a method of charging and treating only waste tires that have been crushed into a coke oven. Is starting.

However, the above methods have a problem in that the waste tires erode the furnace walls of the coke oven during the manufacturing process of the coke, and since the waste tires are used as they are, the iron wire injected into the waste tires is included in the coke ash, which is produced in the coke. Not only does this increase, but there is a problem that the coke tissue becomes non-uniform.

In addition, the above methods have a high usage of waste tires, so the strength of the manufactured coke product is greatly reduced, so the usage of waste tires should be limited. Moreover, since waste tires have a carbonization yield of about 40, the use of waste tires to replace hard coal coal There is also a problem of reducing the strength of the coke produced regardless of the particle size or content of the waste tire.

As another prior art for producing coke using waste tires, there is Japanese Patent Application Laid-open No. Hei 1 -31296. The present invention discloses a method of charging specific waste tires in the lower part of the coke oven carbonization chamber and the upper part of the charged carbon layer. However, in this method, since the softening temperature of the waste tire is lower than the softening temperature of the coal, the waste tire is attached to the carbonization chamber wall heated to about 1000 ℃ and dried as it is, preventing the coke from being discharged from the coke oven. There is a problem that heat transfer to the inside of the coke oven is reduced by carbon.

Although adding waste tires in the manufacture of coke is useful in terms of recycling resources, waste tires should be added within the range that does not adversely affect the quality of the coke produced or the coke furnace itself. There is a need to do so.

The present invention is to solve such a problem, the object of the present invention is a method for producing coke with excellent strength of coke produced by adjusting the particle size and the amount of the added waste tire powder in the coke production method added waste tire powder. To provide.

1 is a graph showing a change in coke strength according to the type of replacement coal according to the present invention,

2 is a graph showing the change in coke strength according to the content change of the waste tire powder according to the present invention,

3 is a graph showing the coke strength change according to the particle size change of the waste tire powder according to the present invention.

In order to achieve the above object, the present invention, in the coke raw coal consisting of coal coal, coking coal, semi-coking coal, weak coal and ordinary coal, the fixed carbon powder is less than 60 and the volatile matter is replaced by the weak coal coke 30 or more metal component is removed It provides a coke production method characterized in that the coke is prepared by blending the waste tire powder of 4mm or less to 7 or less.

Hereinafter, the present invention will be described in more detail.

The basic composition of the raw coal used in the coke production according to the present invention is as shown in Table 1.

Type of raw coal content() Fixed Carbon () Volatile Powder () Mittan A 11 60.60 30.30 Strength coal B 20 68.69 20.79 C 12 66.23 23.40 D 6 74.68 17.68 Semi-hard Coking Coal E 16 64.04 26.41 F 10 66.19 23.81 Weak coal G 7 56.54 33.45 Plain bullet H 7 61.73 25.26 I 9 54.12 34.73 J 2 86.80 11.65

In the present invention, in the composition of the raw coal of Table 1, the weak coking coal is replaced by waste tire powder. At this time, the weak coking coal is preferably less than 60 fixed carbon and more than about 30 volatile matter.

As such, the reason for selecting the weak coking coal that is replaced by the waste tire powder is that the fixed carbon content is less than 60 and the volatile content is about 30 or more.The non-coking coal containing the fixed carbon content of the waste tire is about 40 and the fixed carbon content is about 55 or more. This is because it is lower than the fixed carbon content of phosphorous coal. In other words, the higher the fixed carbon content of the raw coal to be replaced and the lower the volatile content, the more coke is included in the coke after carbonization and eventually the coke strength is lowered. Adding tires does not affect the quality of the coke.

In the present invention, the waste tire added together with the raw coal is used in the form of a powder in which the metal wire is removed after crushing. The waste tires are first crushed to about 100mm, coarsely crushed to about 50mm, and then the metal wire is removed by magnetic force, and then crushed to about 10mm to remove long fibers among the chemical fibers contained in the waste tires. A finely pulverized single fiber is used.

When the particle size of the waste tire powder is 0.5mm or less, the added waste tire powder is widely distributed in the coal mixture to increase the porosity, and the distance between the pores and the pores is short, which acts as a crack generating source. It will promote the breakage of the coke will reduce the strength slightly. As the size of the waste tire powder increases, the number of structural defects decreases, and the coking property of the fixed carbon powder and coal of the waste tire is improved by reacting with the surrounding raw coal during drying, thereby increasing the overall coke strength. However, when the particle size of the waste tire powder is 3 mm or more, large pores are formed in the coke, so the periphery of the pores is weak and the coke strength is lowered. Although the particle size of the waste tire powder is 3mm or more and the coke strength is lowered, the coke strength is higher than when the waste tire powder is not added up to 4mm or less. Therefore, the particle size of the waste tire powder added is preferably 4mm or less, more preferably 0.5 to 3mm.

It is preferable that the compounding quantity of the waste tire powder added to the raw coal is less than 7 with respect to the raw coal. The added waste tire powder changes into a liquidity with high flow during coke drying and sufficiently reacts with surrounding coal to improve cohesion with coal. However, when the blending ratio is 7 or more, the effect of improving the caking property does not appear.

The waste tire powder having the same particle size range is pre-mixed with some or all of the raw coal to make a coal mixture and directly charged into the coke oven, or the waste tire powder is added to the coal coal and a binder is added or not added. The coal briquettes are manufactured by mixing in the form of coal briquettes, and then mixed with the coal briquettes and charged into a coke.

Hereinafter, preferred embodiments of the present invention will be described.

Example 1

Example 1 was an experiment to confirm the relationship between the volatile matter and coke strength of the replacement coal when the waste tire powder in the raw coal composition.

First, the waste tire powder of 3 mm or less from which metal components are removed is mixed and mixed with each of the raw coals shown in Table 1, respectively, to prepare 10 kinds of coal briquettes, and then charged into a closed coke oven and cut off air. Coke was prepared by distilling at a temperature of 1300 ° C. The prepared coke is shown in Figure 1 by evaluating the strength according to the Japanese Industrial Standard JIS 2151 using a coke cold strength measuring device.

According to FIG. 1, the higher the volatile content of the replacement coal, the higher the strength, and the highest coke strength was obtained when the weak coking coal was replaced with the waste tire powder.

Example 2

Example 2 was an experiment to confirm the change in coke strength according to the content of the waste tire powder.

According to the experimental results of Example 1, when the coking coal is replaced with the waste tire powder, the coke strength is increased the most. Therefore, the coking coal is replaced with the waste tire powder of 2.7 mm or less in which the metal component is removed. Subsequently, the contents of the waste tire powder were changed and mixed. Hereinafter, the method for producing the coal blend, the method for producing coke, and the conditions for measuring coke strength are the same as in Example 1. Coke strength according to the content of the waste tire powder is shown in FIG.

According to FIG. 2, when the content of the waste tire powder replacing the weak coking coal is 5, the maximum strength is shown, and when the content of the waste tire powder is 7 or less, the overall strength is higher than when the waste tire powder is not added.

Example 3

Example 3 is an experiment to check the coke strength change according to the particle size change of the waste tire powder.

The addition amount of the waste tire powder from which the metal component replacing the weak coal was removed was fixed at 3 and mixed while changing the particle size of the waste tire powder. The composition of the blended coal is the same as that of the raw coal of Table 1 except for the weak coking coal, and the method for producing the coal blend, the method for producing coke, and the conditions for measuring coke strength are the same as in Example 1. Coke strength according to the particle size of the waste tire powder is shown in FIG.

According to FIG. 3, when the particle size of the waste tire powder is 5 mm, the coke strength is lower than when the waste tire powder is not added, but when the particle size of the waste tire powder is maintained at 4 mm or less, it is higher than that when the waste tire powder is not added. Coke strength was shown.

As described above, in the present invention, waste tires can be treated in large quantities by securing high-quality coke without degrading the strength of coke by adding waste tire powder by replacing weak coal of raw coal. It works.

Claims (1)

In the coke raw coal consisting of coal coal, coking coal, coking coal, weak coal, ordinary coal, A method for producing coke, characterized in that coke is prepared by mixing less than 4mm of waste tire powder having a metal component removed to 7 or less by replacing the weak coking coal having a fixed carbon content of less than 60 and a volatile content of 30 or more.