DE407624C - Increase the baking ability of badly baked coals when coking - Google Patents

Description

Increase in the baking ability of poorly baked foals when coking. The invention relates to improvements in the manufacture of coke. There is It is well known that different types of coals are used either at all during the coking process no coke or such a coke whose strength for metallurgical processes, z. B. in the blast furnace process, is not sufficient; these are mainly the so-called not or badly baking coals.

To overcome this difficulty i. H. to badly baked To make coals more bakable when coking has been proposed, the finely divided Coal before heating for the purpose of coking a binder, such as tar or a Mixture of pitch and tar to be added.

In the formation of coke from finely divided coal are known to be Coal particles melted and then bake together into a uniform mass, which is spongy or foamy due to the gases released as a result of heating Quality assumes. If now finely divided charcoal for a long time at room temperature exposure to air or hotter during a shorter period of exposure Gases, especially oxidizing gases, reduce the surface of the carbon particles Experience has shown that it is in a state that causes the coal particles themselves to stick together then hindered or prevented when they are in intimate contact with one another at melting temperature be heated. The inventors have now found that certain types of coal in finely divided state have a particular tendency to lose their baking ability. The cause of this phenomenon was found to be that during heating to the Purpose of coking is mainly present in the interstices between the particles Air prevents baking. Attempts have therefore been made to produce a resistant Secure coke from naturally poorly baked coals by taking appropriate measures eliminate this adsorbed air. To this end, the procedure offered by the Patent 371043 and that. after the patent 39o656 a reference. Accordingly, it was attempted the finely distributed poorly baked coal, suspended in a watery cloudiness kept stirring with a liquid binder and aerating and thereby one to achieve loosening of the coal particles. It turned out that these flocculated masses, when pressed into briquettes, are essentially none Contained more air, so that now the carbon particles displaced the adsorbed ones Air were coated with the binder and from the briquettes so produced a more resistant coke for smelting purposes could be achieved. In cases where this procedure alone was not enough to counteract the resistance of the coal To overcome flocculation, were based on the method according to the patent 39o656 Cloudy acids added. Accordingly, the invention provides a method of increasing the ability to bake poorly baked coal when coking with the addition of a binder in that initially held in suspension to expel adsorbed air in water Particles of non-baking charcoal with the liquid or liquefied binder if necessary with the addition of a mineral acid, stirred vigorously, the flocculated Masses are separated from the water and formed into briquettes, whereupon the briquette be coked.

The quantity ratio of the binder to be used must be dimensioned in this way that it is just enough, a manageable briquette without gaps to achieve between the particles.

It is not essential that the briquette be any particular mechanical Possess resilience; you can therefore use soft or oily binders, such as Tar, which results in relatively soft briquettes.

Various types of non-bake charcoal have been found with success treated the new method, of which an exemplary embodiment is given below. According to this, a coal salary from Saar Vallev in France was taken as the basis and from it a more resistant coke is made for smelting purposes; this was previously with none of the known methods can be achieved. The greeting consisted of a mixture of Luster coal and matt coal with coal shale. The ash content was 2 -., A percent, but could be reduced to 9.12 percent by the swimming procedure. This Concentrate was sieved through a sieve with a mesh size of 0.2 mm. The sieved finer grains were treated in an acidic pulp containing 0.45 kg of sulfuric acid contained on the bin. The treatment took place in a cell with a stirrer, whereby a binder was added (read three parts pitch to two parts tar in one Amount of 5 percent binder on (read the total weight of the coal (fine and coarse) contained. Steam was let in - and the temperature of the slurry was brought to 90 ° C. After the finer coal particles were flaked, the coarse coal particles became with stirring added and so the entire mass flaked. Finally the water was drained and it was briquetted to the square inch under a pressure of two tons.

The coking was done by packing the briquettes in a clay port and heating in an electric furnace for two hours at a temperature which is gradual increased to io4o ° «urde. The coke produced had a breaking strength of 1094 kg to the square inch. This result was later confirmed by a factory experiment in a coke oven.

For comparison, the same concentrate was flaked in the same way only filtered and not briquetted; it showed a breaking strength of 467 kg the square inch (about 6.42 sq cm). If it was neither flocculated nor briquetted, this was the case the coke produced was not uniform and its homogeneity was insufficient to produce a To effect strength test.

In another experiment, a coke was obtained from a coal produced by the Ashington Colliery in Northumberland, which had a compressive strength of 1186 kg. was the square inch (about 6.42 sq cm).

Claims (1)

PATENT CLAIM: Application of the briquetting process according to patent 371043 and 39o656 on charcoal of low natural baking ability in order to reduce its baking ability to increase when coking.