JPS5925884A - Manufacture of coke - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for producing a coking coal mixture from one or more coking coals, wherein the coking coal mixture has a predetermined coking time during coking in a coke oven chamber; Production of coke, especially metallic coke and foundry coke, by adding granular metal to raw coal, filling it in the furnace chamber of a coke oven, compacting it as much as possible, turning it into coke here, and extruding it as a coke cake according to the coking time. Regarding the method.

In the context of the present invention, grain size refers to mainly medium to fine grain sizes in the range from a few millimeters to approximately 100 microns for metals.

In this case, the concept of [-granular-1] also includes cut pieces, ablated cut pieces, etc.

In the known method mentioned at the outset (German Patent No. 534 721), metals or compounds of the 4th and 5th periodic elements, in particular chromium, manganese or copper, are mixed as metals, and It is mixed in an amount much less than .5% by weight, ie in the range of 0.01 to 0.02% by weight. These metals only act as catalysts and reduce the sulfur content of the coke in sulfur-laden coals. Does not affect carbonization time. Adding metals to coke is still rarely mentioned. To increase the hardness and stability of metallic coke, steel,
It is known to mix pieces or particles of austenitic steel or copper, and in amounts of 0.01 to 0.5% by weight. Although the mixture of these materials appears to improve the heat transfer within the compacted raw coal mixture, it does nothing for the adjustment of carbonization time.

Rather, an improvement in graphite formation is expected. In the framework of all these known procedures, the carbonization time corresponds to the coking time of the raw coal mixture.

The object of the present invention, on the other hand, is to make it possible to carry out carbonization in a considerably shortened time using the method described at the outset, without impairing the quality of the produced coke in terms of stability and hardness. It is in.

In order to solve this problem, the present invention shows the following. That is, the raw coal mixture is mixed with aluminum in an amount of 0.3% by weight or more and the coke cake is extruded after a carbonization time that is at least 10% shorter than the coking time.

What the invention shows for the technical process is a difference between the carbonization time on the one hand and the coking time on the other hand. The carbonization time is, so to speak, the coking time that a coke cake (raw coal mixture) without aluminum added had. The object of the invention is therefore to apply a procedure in which granular aluminum is mixed in an amount of 0.3% by weight into the coal mixture used for carbonization, in order to shorten the carbonization time. The carbonization time can be reduced by up to 30% compared to the coking time of the raw coal mixture, which depends on the composition of the raw coal mixture on the one hand and on the amount of aluminum mixed in on the other hand. According to an advantageous embodiment of the invention, within the framework of the invention 0
．． Aluminum is mixed in an amount of 5 to 2.5% by weight. Those skilled in the art will find an upper limit experimentally for each raw coal mixture. Within the framework of the present invention, aluminum means
Technically pure aluminum and commercially customary light alloys mainly consisting of aluminum, such as those used, for example, in sheet metal, special profiles, containers, nozzles and packaging tubes. Surprisingly, the amount of aluminum added according to the invention does not impair the properties that the coke should have depending on the application.

The addition of aluminum to coal to be carbonized or coked is known per se (DE 743 743). However, carbonization in a coke oven is not shown here, but coking and sulfur treatment in a nitrogen stream to increase the yield of gas or gaseous benzine and tar. Aluminum is added in the passage as a catalyst and in addition to the primarily added heavy metal or heavy metal compound.

In detail, there are various other configuration possibilities within the scope of the invention. In particular, within the framework of the invention: 6- Aluminum in the form of finely cut aluminum foils and/or aluminum plates may be mixed. According to another proposal of the invention, powdered aluminum is mixed and the individual coal particles of the raw coal mixture are surrounded by a coating layer of aluminum powder. If powdered aluminum is used, the particle size will advantageously be less than 100 microns.

When producing blast furnace coke, according to the invention granular aluminum is mixed in in an amount of preferably 0.3 to 2% by weight. When producing foundry coke, 0.5 weight M%
It has proven advantageous to admix granular aluminum in an amount of preferably approximately 1% by weight. Within the framework of the invention, raw coke mixtures can be used which consist mainly or exclusively of high-volatile coal. Nevertheless, coke of high hardness and stability is obtained.

The advantages obtained are mainly as follows. Thus, in the process according to the invention, the carbonization time up to extrusion of the coke cake from the coke oven can be considerably shorter than the coking time determined by the raw coal mixture, without impairing the quality of the coke produced in terms of crushing and hardness. . Another advantage of increasing the aluminum content is that the coal becomes more dehydrated when brought to carbonization temperatures. Thereby, in the process according to the invention, methane and heavier hydrocarbons are used to produce hydrogen and coke. If the raw coal mixture consists primarily of high-volatile coal that cannot be converted into coke as it is, then within the framework of the invention, available coke is obtained. Within the framework of the invention, therefore, even coal that could not be used for coke up to now can be processed. In addition, the reaction of sulfur with aluminum is particularly advantageous. This reaction should only occur at temperatures above 600°C. When sulfur-laden coal is introduced into the raw coal mixture, the sulfur can thus be removed from the coke oven chamber as before until the temperature rises above 600°C. Due to the presence of aluminum, the large amount of hydrogen produced will even help eliminate this sulfur. The sulfur content of coke decreases.

Coke made according to the teachings of the present invention with reduced carbonization times contains metallic aluminum, which provides advantages when using the coke. When the humidity in the blast furnace is high, the aluminum in the coke is in liquid form. A reaction occurs between the pig iron and aluminum, which causes decomposition and produces aluminum sulfide. Aluminum sulfide penetrates into the slag and facilitates desulfurization treatment after removal from the blast furnace.

Next, the present invention will be explained using graphs.

The graph shows three different raw coal mixtures ■, ■ and ■
shows a group of curves related to On the horizontal axis, the aluminum content added to the raw coal mixture is shown in % by weight. On the vertical axis, the coking time, designated tl, is plotted. In addition, carbonization time t, -5%, t, -1
0% and t, -15% are filled in. These curves make it clear to what extent the carbonization time can be shortened compared to the coking time when the indicated amounts of aluminum are mixed.

[Brief explanation of the drawing]

9 - Figure is a graph showing a family of curves for three different raw coal mixtures ■, ■ and ■. Yon

Claims (8)

[Claims] (1) A coking coal mixture is made from one or more coking coals, and the coking coal mixture has a predetermined coking time during coking in a coke oven chamber, during which particulate metal is added to the coking coal. In a method for producing coke, especially metal coke and foundry coke, which is filled in the furnace chamber of a coke oven, coked there, and extruded as a coke cake according to the coking time, 0.3% by weight is added to the raw coal mixture. Aluminum in an amount of at least 10% more than the coking time
A process for the production of coke, characterized by extruding a coke cake after a short carbonization time. (2) A method according to claim 1, characterized in that aluminum is present in an amount of from 0.5 to up to 2.5% by weight. (3) The method according to claim 1 or 2, characterized in that the aluminum is in the form of finely cut aluminum foil and/or aluminum thin plate. (4) A method as claimed in claim 1 or 2, in which powdered aluminum is mixed and the individual coal particles of the raw material mixture are surrounded by a coating layer of aluminum powder. (5) The method according to claim 4, characterized in that the powdered aluminum has a particle size of 1 mm or less. (6) When manufacturing coke for blast furnaces, 0.3 to 2.0
6. Process according to claim 1, characterized in that granular aluminum is present in an amount of % by weight. (7) A process according to one of claims 1 to 5, characterized in that during the production of foundry coke, granular aluminum is used in an amount of at least 0.5% by weight, preferably approximately 1% by weight. . (8) A process according to claim 6 or 7, characterized in that the raw coal mixture consists mainly or exclusively of high-volatile coal.