DE2123313A1 - Process for the production of metallurgical coke - Google Patents

Description

TELEPHONE: COLLECTIVE NO. S2 53 4T

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POSTAL CHECK ACCOUNT: MUNICH 911 3O

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S MDNCH EN 2,

Case 3046-30

NIPPON KOKAN KABUSHIKI KAISHA, Tokyo / Japan

Process for the production of metallurgical coke

The present invention relates to a method of making metallurgical coke and, more particularly, to an improved method to produce a strong, stable coke with excellent strength even in the case of coking coal.

The strength of coke is one of the important properties if it is to be used as metallurgical coke for the production of iron and the like. For this reason, many procedures were according to which this coke can be improved, proposed and put into practice. For example, it is well known that one has medium-hard pitch, which has about the chemical quality of coking coal, anthracite, oil coke, which is useful as an aggregate or ferrocoke made by mixing calcined iron ore with a coking coal to the coking coal or can add to mixed charcoal.

However, it is also known that the previously known methods the unfavorable disadvantages given below

109847/1352
BATH ORIGINAL

exhibit:

1.) The addition of pitch can increase the fluidity of the coal, when the operating speed of the furnace is low and the coking temperature is below 1200 C. if However, the temperature is higher than 1200 C, will thorn out Pitch carbon deposited on the furnace walls The reason why the thermal decomposition in the furnace becomes violent, which can affect the leakage of gases and the exhaust operation of the furnace. This fact promotes education bubbles in the coke causing a decrease in strength »

2.) The addition of inactive materials, such as anthracite, similar Coal, powder coke, oil coke, mineral materials or the like as the core material is useful for improvement the strength of a coal, which has a baking capacity and has fluidity. However, if a dc-r-like Coals that are poor in fluidity, such as a Canadian coal or an Australian coal, with other coals is mixed, the addition of the above-mentioned inactive materials should be limited, as this addition Caking capacity is also impaired

From the above it can be seen that the previously known Procedure cannot fully satisfy.

According to the invention, the above-mentioned disadvantages are to be overcome. According to the invention, the coke properties are increased by adding a wire-like or in the form of small pieces present metallic or non-metallic material Improved coking coal or mixed coals. It goes without saying that this method differs significantly from those previously known Procedure differs.

The object of the present invention is thus to provide a method for improving the strength of coke made from coking coal or mixed coals

1 0 9 8 A 7/1 3 5 2

ORIGINAL BATHROOM

create.

The inventive method enables with ease a baking power (caking power) that the mixed coals is own.

Another object of the present invention is to provide a method of enhancing coking of mixed coals to achieve at the coking stage and the breaking or breaking of the coke, which occurs in the removal, storage and Loading stages can occur to avoid.

According to the invention, metallic materials in the form of wires or small pieces include steel, stainless Steel, copper and the like and carbon fiber, high carbon synthetic resins and the like as wire-like or wire-like or in the form of small pieces non-metallic materials. When such materials are present, the rate of heat that is guided from the wall to the center of the furnace, accelerated, whereby the heat transfer is promoted. the Notable effects based on such heat transfer are as follows:

First of all, the above materials create a bond the cracks that can occur in the coke during the coking stage. Second, the coking is due to the heat transfer accelerated, as this material accelerates the transfer of heat to the coal next to it. Third, the Solidification of the coke advanced while the rate of coking increased with heat transfer will. Even if this speed is not increased, it can be expected that the graphitization by the compensation the thermal distribution is improved.

It has been found according to the invention that when the shape of the above mentioned wire-shaped or present in the form of small pieces Materials is within a certain range

10984 7/1352 BAD ORIGINAL

and these materials are added in a certain amount which maximizes the above-mentioned effects. I.e. the diameter of the material will be in a range from 0.1 mm to 0.8 mm and the length in a range from 2 mm to 150 mm chosen. Such materials should be in an amount of 0.01 to 0.5% by weight, preferably in an amount of 0.03 to 0.3% by weight, may be added.

It is not always necessary that the cross-section of the wire-like or wire-like materials be circular. If the dimensions are within the above-mentioned range, a small piece cut from sheet material, L as from sheet metal, can also be used. It will be understood that iron wire or sawdust are also suitable wire-like materials in accordance with the present invention.

The reason that the dimensions of the added materials, as noted above, is that if the material is too small it tends to be at the increased Temperature, i.e. at a temperature of more than 1300 C, whereas if the material is too large, it will melt results in poor compatibility with the mixed coals. The limitation on the length is based on similar ones Establish. If the material is too short, the material will tend to melt, and if it is too long it will difficult to control the grain size of the coke. If the material addition is below 0.01% by weight, sticking together will occur and the heat transfer deteriorates. On the other hand, if the amount is too much, it will generally result no difficulties. However, for economic reasons, the amount added should be specific to one Value can be limited. If, for example, the monthly amount of coke produced reaches 250,000 t / month, this would be an additional amount of 1% by weight 2500 t of the wire-like material per month is required. Even if the material is steel wire, which is readily available, it is not easy to get one like that

109847/13 5 2

to manufacture large quantities of iron wire. This is one reason why the amount added is reduced to less than 0.5% by weight is limited.

The properties of the coke produced according to the invention are, vac results from the following examples, excellent. I.e. drum strengths of about 1.0% (strength according to the drum index) and drop resistance 50 inrn of about 6% (fall index) can be achieved with ease «

Used carbohydrates:

Beatrice

: Low volatility coals from the USA T am ε

: Middle] volatile coals from the USA

Davis B Eagle S Vicary: Medium volatile coals from Canada

R. Moure

: Medium volatile coal from Australia It man Ö1 k οk c: InIaηdk οhie

Added wire-like materials: Diameter: 0.6mm Length: 60mm Amount added: about 0.17% by weight

Mixing ratio: as indicated in Tables I, II and III. Coking temperature: IJOO C

Base coals: common mixed coals without wire-like materials.

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103847/135

BATH ORIGINAL

Table II

Coal type

<y According to the invention Basic difference Difference

staggered coal staggered coal coal

(Fe)

(Cu)

(Cu)

Beatrice 7th 15 mm 89.4 Tarns 7th 25 mm 82.6 Davis B. 26th 50 mm 19.1 Eagle S 8th ST% - Vicary 10 75 mm 15.1 R. Moure 14th 50 mm 62.3 Oil coke 3 3 8 mm 82.7 Itman 7th 25 mm 94.4 Inland coal
higher qua
lity 18th 15 mm 96.8

90.4 89.0 + 0.4 + 1.4 I. 84.3 81.9 + 0.7 + 2.4 -0
I. 16.0 15.3- + 3.9 + 0.7 13.3 15.7 - 0.6 - 2.4 · ■ 61.0 60.7 + 1.6 + 0.3 83.6 82.8 - o, i + 0.8 94.2 94.1 + 0.3 + 0.1

97.3

96.0 +0.8

+ 1.3

Table III

Coal type

Errgem. Successful % TI,% offset- offset

With 3% With 6% (1) (2)

Bad luck bad luck basic dif-

te coal te coal versetz- versetzkohle renz renz
(Fe) (Fe) te coal te coal (Fe) (Fe)

6% bad luck bad luck Diffe Diffe renz renz + 2.3 + 2.0 + 1.0 + 4.0 - 7.3 - 5.1

Beatrice
Tanns
Davis B.
Eagle S
Vicary
R. Moure
Oil coke

Domestic coal higher
quality

Inland coal
lower
quality

7 15 mm

7 25 mm
26 50 mm

8 ST%
10 75 mm
14 50 mm

5 38 mm

89.8 82.5 25.2

26.6 70.8 84.6

90.7 82.6 22.5

20.5 67.6 85.2

14 25 mm 94.3 94.7

91.3 84.4 15.4

14.0 60.0 83.5

95.2

88.3 +1.5 +2.4

80.4 + 1.1 + 2.2

20.3 + 4.9 +

17.4 + 9.2

56.0 + 4.8

81.1 + 3.5

94.4 +1.0

- 1.4 - 2.6 + 3.2 + 4.0 + 0.7 + 2.4

+0.1

+ 0.8

9 15 mm 96.8 97.0

97.3

97.0

0.2

+ 0.4 + 0.3

Note: The column "TI" indicates the tests according to the drum index and the values marked "ST" are those obtained after the drop test.

The mean values for the drum strength and for the Drop resistance are given in Tables IV and V below.

Table IV

Drum test

Type:

Base coal Staggered coal difference

15 mm 25th mm % 50 mm % 88.8 % 81 , 6 % 20, 4th % 90.0 % 82 , 6 % 20, 6th % + 1.2 % + 1 , 0 +0, 3 Table V Fall test

Type: 75mm 50 ram 38mm 25mm 15mm

Base coal 13.3 % 57.5% 81.0 % 94.2 % 97.1 %

Staggered coal 19.9 % 65.5 % 82.9% 94.4% 97.0 %

Difference +6.3% +8.0 % +1.9% +0.2% -0.1 %

Note: "Offset coals" are the mixed coals obtained by adding the wire-like materials to the base carbons.

The mean particle sizes in the above-mentioned drop test are the following:

Base coals: 54.5 % Offset coals: 5 7.9% Difference: 3.4%

109S47 / 1352

The values given in the tables above were obtained with the aid of a test coke oven. The tables show that the results of the coal displaced according to the invention are better than those of the base coal. In particular, the fact that the mean grain size of the mixed coal is about 3 % superior to that of the base coal indicates the reduced fragility of the coke. It is generally well known that the results obtained with a test oven are inferior to those obtained with a real coke oven. This is based on the fact that the coking gas speed of the test coke oven is greater than that in an actual coke oven. Accordingly, the effects of adding wire-like or wire-like materials obtained using a real furnace are better than the results obtained using a test furnace.

Furthermore, no adverse effect due to the addition of the wire-like Har.eriali.en could be found on the appearance of the coke. That is, the tendency of separation is not observed and the formation of small holes is not prevented. The surface quality of the coke is also very good. Thus, the appearance of the coke is as good as that of the known coke.

109 8 47/1352

Claims (7)

- 11 claims 1.) Process for the production of metallurgical coke by coking coal in a coke oven, characterized in that one a wire-like or in the form of small pieces present metallic material to the coking coals, which in the Furnace are charged, added and mixed with it. 2.) A process for the production of metallurgical coke by coking coal in a coke oven, characterized in that a wire-like or non-metallic material present in the form of small pieces is added to the coking coals which are entered into the oven and mixed therewith. 3.) The method according to claim 1, characterized in that the added and admixed material made of steel, stainless Made of steel or copper. 4.) The method according to claim 2, characterized in that the added and mixed in material of carbon fibers or a high carbon synthetic resin. 5.) The method according to claim 1 or 2, characterized in that the diameter or the width of the added and mixed Material in the range from 0.1 to 0.8 mm and the length of this material in the range from 2 mm to 150 mm and the amount of this material added is 0.01 to 0.5% by weight. 6.) The method according to claim 5, characterized in that the added and admixed material from carving-shaped or wire-shaped scrap. 7.) The method according to claim 5 or 6, characterized in that the distribution of an added and mixed material is balanced or equalized. 109847/1352