LU82339A1 - PROCESS FOR PRODUCING METALLURGICAL COKE - Google Patents

Description

ίψ Claiming the priority of a patent application filed in Belgium on April 6, 1979 under No. 875.412! ^ ts ·. % i- Zvrv (in.

C 1950/7904.

! i [j: METALLURGICAL RESEARCH CENTER - I ·) CENTRUM V00R RESEARCH IN DE METALLURGIE,

Non-profit association - Vereniging zonder • winstoogmerk in BRUXELLES, (Belgium).

i ..........-. . ............ ........... ------ ——— 1 "; Proceeds to make metallurgical coke.

The present invention relates to a process for manufacturing metallurgical coke which can be used in particular as a constituent of the charge of blast furnaces.

The manufacture of metallurgical coke generally practiced at present consists in placing the raw materials, mainly coking coal, in carbonization cells and in heating these materials which, by distillation and agglutination, give products having the well known form of coke used in steel plants.

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There are currently economic difficulties in such manufacture because of the decrease in coking coal reserves and the increase in the price of these coals. These difficulties also become more acute due to the fact | the need to diversify the energy sources used in industry, in order to better adapt consumption to existing reserves.

For many years now, attempts have been made to remedy the difficulties and disadvantages described above, by using as high a percentage as possible of non-coking coal. Processes are thus known which consist in agglomerating fine coal, whether coking or not, for example in the form of balls or briquettes, optionally with the addition of solvents and / or binders, and of placing these raw agglomerates in a carbonization cell with coal. coking end.

The most frequent addition is pitch; however, this has the disadvantage of being expensive and its use as a binder in the manufacture of agglomerate based on fine coal is strongly felt in the price of i returns the metallurgical coke thus obtained, i

We looked for other materials with pro-! properties capable of playing the role of either a solvent or a binder.

Tests of replacement processes carried out by the applicant have shown that the metallurgical coke obtained in this way has good quality indices and makes it possible to increase the productivity of the coking oven, without harming the quality of the gas.

The present invention specifically relates to such a replacement process.

This process is based on the following considerations. It is known that coal tar is unsuitable for use as a solvent and / or binder in the presence of non-coking fine charcoal l dH · *** J * "~“ '"* ~"' “.......

! :. * i i i in order to manufacture metallurgical coke. However, during his research, the applicant made the completely unexpected observation that by subjecting the tar to a heat treatment, i give this material properties which make it suitable for such manufacture of metallurgical coke.

This observation is very important, not only by the new possibilities offered in the manufacture of metallurgical coke from coking coal or not, but. also for the recovery of coal tar and its constituent elements.

Consequently, the process which is the subject of the present invention, in which agglomerated or non-coking fine charcoal is agglomerated in order to then put the said agglomerated raw material into a cell i | carbonization with coking fine charcoal, is essentially characterized in that the agglomeration of fine charcoal is carried out in the presence of a solvent and / or binder comprising at least coal tar heated to a temperature between 200 ° C and 600 ° C, and preferably between 300 ° C and 450 ° C, for the time necessary and sufficient for there to be polycondensation.

According to one embodiment of the invention, the coal tar used as solvent and / or binder is constituted by the residual tar from the manufacture of metallurgical coke.

The heating of the coal tar is advantageously carried out by bringing it into contact with a heat source, in particular with a conventional heat exchanger or preferably with a vertical heat exchanger along which the tar descends by enveloping it in the form of 'a movie.

According to another embodiment of the invention, the heated tar is immediately mixed with the coal, to which it must serve as a solvent and / or binder and thus contributes to the heating of the said coal before the subsequent shaping of the mixture.

% i "4.- *" I!; j Μ! According to the invention, the residual products of the heating of coal tar to be used as solvent and / or binder to it are recovered with a view to either being burnt , either processed or sold, ”depending on their composition and the state of the market.

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Claims (6)

1. Process for manufacturing metallurgical coke; in which agglomerated fine coal is agglomerated or not to then put the said agglomerated raw in a carbonization cell with coking fine charcoal, characterized in that the agglomeration of fine charcoal is carried out in the presence of a solvent r and / or binder comprising at least one coal tar: 'heated to a temperature between 200 ° C and 600 ° C, and preferably between 300 ° C and 450 ° C, for the time necessary and sufficient for there to be polycondensation. 2. Method according to claim 1, characterized in that the coal tar used as solvent and / or! binder consists of the residual tar from the production of metallurgical coke. 3. Process according to either of the claims 1 and 2, characterized in that the heating of the coal tar is carried out by bringing it into contact with a source of heat, in particular with a classic heat exchanger. i 'r 4. Method according to claim 3, character ized in that the heating of the coal tar is carried out by bringing it into contact with a vertical heat exchanger along which the tar descends by enveloping it in the form of a film. 5. Method according to either of claims 1 to 4, characterized in that the heated tar is immediately mixed with the coal, to which it must serve as solvent and / or binder and thus contributes to the heating of said coal, before I the subsequent shaping of the mixture. T \, r 6. - 6. Method according to either of claims 1 to 5, characterized in that the residual products from the heating of coal tar to be used as solvent and / or binder are recovered with a view to either being burnt or treated , either sold. <r / »/ e c