LU81774A1 - IMPROVED PROCESS FOR THE MANUFACTURE OF METALLURGICAL COKE - Google Patents

Description

4 BL-2746 / vd

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Patent application, October 10, 1979 Designation of the Inventor (1) The undersigned ....... FREYLINGER Ernest., ... b.p .. 115.3.,. 46 rue du Cimetière.,

LUXEMBOURG

acting as cteŒlépDSHKi - representative of the depositor - (2) .... Center ... Research ... Metallurgical, -.Centr.uiu V.oor .... Research.-in Metallurgy, ... as .sociation ... without ... profit ... profit., vemnigfn.g .... sonder winstoogmerk, 47. rue Montoyer, MiiB -, 1040 BRUSSELS .............. ...................................

(3) of the invention relating to: ..... ".. Improved process ... for the manufacture of metallurgical c.oke designated as inventor (s): 1. Name and forenames ... ..MUNNI.X. René ........................................... .................................................. ...................

Address ............................. 7.2a. road. de ... Maas.tricht.r ... B ....... 4.65.1 ... B.atti.c.e ............

2. Surname and first names VIDAL Roland ........................................... .................................................. ... ...

Address 23 rue de Herve, B - 40 30 Griv.egnee ............................... ....

3. Full name ...... POOS ..Arthur ...................... ............. .................................................. .......................

Address ............................ 15. rue ..de Gr.ady, B. -, ... 49.2Û ... Embo.urg ........................... ...................

He affirms the sincerity of the aforementioned indications and declares to assume full responsibility for them.

Luxembourg i. 15 October 19.79 ...

f ............................

/ / (signajüre) / // 7 /> A 68026 * '/ / -r - / - (1) Last name, first names, company, address.

! I * BL-2746 / vd! C 1982/7910.

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3 PATENT OF INVENTION

v »i i i | · | METALLURGICAL RESEARCH CENTER - CENTRUM VOOR RESEARCH IN DE METALLURGIE,

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

Improved process for the manufacture of metallurgical coke.

The present invention relates to an improved process for the manufacture of metallurgical coke usable in particular as a constituent of the charge of blast furnaces.

! [j The manufacture of metallurgical coke generally! 'practiced at present consists of placing raw materials, mainly coking coal, in carbonization cells and heating these materials which, by distillation or agglutination, give a product having the properties very well known of the coke used in steel plants.

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The manufacture of coke, using the conventional process from coking coal, currently poses problems due to the significant growth in demand for coke, the decrease in the supply of coking coal and the increase in the price of these carbonates; these difficulties also become more acute because of the need to diversify the energy sources used in industry, with a view to better adapting consumption to existing reserves.

For many years now, attempts have been made to remedy the difficulties e: drawbacks mentioned above, by introducing into the charge 3u non-coking coal, in as high a percentage as possible.

Among the techniques which have been proposed, the processes consisting in agglomerating fine charcoal, for example in the form of balls or briquettes, and in baking these agglomerates in a carbonization cell are known.

In one version of these processes, the agglomerates consist of a mixture of coking coal and non-coking coal.

In another implementation, the agglomerates put in are only made of non-coking coals.

The aim of all research in this field is, both to obtain coke of satisfactory quality and size for the needs of blast furnaces, to reduce the cost of manufacturing this coke, by using as much of non-carbon as possible. coking, without reducing the productivity of the coking plant or adversely affecting the quality of the gas obtained.

With this in mind, and still with the aim of reducing the consumption of coking coal for the manufacture of coke, a method has also been proposed according to which use is made of little or no coking coal which is subjected to the following successive operations. : r 4 · 3.- lla) drying with or without preheating, b) compaction which has the effect of increasing the density of the coal, c) addition of a coking additive playing the role of solvent and / or binder.

This process, imagined in particular by the same applicant, makes it possible to use large quantities of non-coking-reliable coals, while producing good steel coke.

However, it appeared that in certain cases, the properties of the cokes thus produced could be further improved, and that in particular their index characterizing their resistance to cracking was likely to increase, which corresponds to a better quality of the coke.

The process of the invention is based on the observation that the quality of the coke increases when, to the mixture of coking coals, we add: - agglomerates made from non-coking coals, added with a coking agent, - synthetic coking materials produced from non-coking fine coals, added with a coking agent.

In the present invention, the word "compacted" can mean individually or in a mixture, balls, briquettes, broken chips, splits, granules, pancakes, etc.

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According to an advantageous variant, these fine non-coking coals have themselves been previously dried, compacted after addition of a solvent binder and the product of this compaction v crushed before being mixed with the coking coals to be subjected to carbonization.

According to another variant, the fine non-coking coals treated with an appropriate additive are introduced into the mixture to be coked, at a temperature above 60 ° C., which makes it possible to recover sensible heat for the benefit of the coke oven.

4.- For comparison, we can establish the table of characteristic values below, for different coals intended to be subjected to coking.

This double entry table gives, by way of example, values of the mechanical strength indices of coke, well known under the signs M ^ Q, M ^ q, I- ^ q "I20; and Ce Pour ^ es co ^ es produced from a good basic mixture and a mixture consisting of 60% of this coking mixture and 40% (non-coking coals, pretreated in different ways.

Recall that the quality of a steel coke is | all the better as the indices and have higher values j, and the indices 1 ^ and are low.

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I ^ “^ - v ^ charge density index-! coal ^^^ M40 M10 I20 approximate! A 80 8 18 79 0.7 B 67 15 28 69 0.7 C 65 7 17 80 0.9 D 78 11 22 76 0.7! E 76 9 19 78 0.8 "

Coke A is produced from 100% coal; coking of good quality, and the corresponding values of; different indices should be considered as ideal values, which it is advantageous to approach simultaneously for all indices.

Coke B is produced from a mixture comprising 60% of mixture A and 40% of non-coking fine coal. It can be seen that for this charging, the quality of the coke becomes clearly insufficient.

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Coke C is produced from a mixture comprising 60% of mixture A and 40% of non-coking coal, in compacted form after drying and addition of a coking agent.

It can be seen that the quality of coke has greatly improved, only the index Μ.Λ remains low.

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Coke D is produced from a mixture consisting of 60% of mixture A and 40% of the quality listed under C, but the latter having been crushed. We note that the index M ^ 0 has risen, while the other three indices are degraded.

Grade E represents one of the typical variants forming the subject of the process of the present invention; it consists of a mixture comprising 60% of mixture A and 40% of a carbon itself consisting of a mixture of dried non-coking coal, part of which is compacted after the addition of a solvent binder , and the other part is pretreated by coating with an aromatic solvent.

We can see that the 4 corresponding indices now simultaneously present values closer to those relating to grade A coal.

According to the invention, the coking agent can be used, either solid (and pulverulent) and mixed with non-coking fine charcoal, then heated with it, or liquid and coating the non-coking fine charcoal, which is at a temperature above that of fusion of the said agent.

As for fine non-coking coal, it can be either wet or dry, and in the latter case, cold or hot.

The term “coking agent” is understood to mean, in the present patent, materials which modify the melting and agglutination behavior of coals, such as for example aromatic hydrocarbons (coal tar, petroleum pit, pretreated coal tar, etc ...).

Claims (7)

1. A process for the manufacture of coke, characterized in that a mixture is prepared comprising: a) fine coking coal, b) agglomerates made from non-coking coals, added with a coking agent, c ) of synthetic coking materials produced from fine non-coking coals, added with a coking agent, and in that the said mixture is introduced as it is into the carbonization furnace. 2. Method su.vant claim 1, characterized in that the synthetic coking material listed under c) in claim 1 is itself compacted, then crushed before d * | be incorporated into the mixture. j 3. Method according to claims 1 or 2, ca-! characterized in that the agglomerated charlon and / or the synthetic coking material are included in the mixture, at a temperature above 60 ° C. ? 4. Method according to either of the claims | 1 to 3, characterized in that the non-coking coal is coated with a coking agent, preferably in the liquid state. . 5. Method according to one or other of claims 1 to 4, characterized in that the non-coking coal is dried. t fi 7.- " 6. Process for the manufacture of coke, characterized in that a mixture is prepared consisting of - fine coking coals, - agglomerates of non-coking coals, previously dried ”and added with a coking agent of the aromatic hydrocarbon type , - a synthetic coking material, produced from non-coking coals, coated with a coking agent. "* 6.- I - - • · R JVENDICATIONS 7. Processes as described above. 1-Â / É0Î tlL / pJ J /