DE875506C - Binder for hard coal briquetting - Google Patents

Description

Binder for hard coal briquetting The briquetting of Lean coal requires the use of binders. This is what serves still predominantly the residue from coal tar distillation, the coal tar pitch. Every effort is made to replace the coal tar pitch with other substances to be replaced with equally favorable or better properties, n, have not yet had the desired success.

According to the invention a new Bind # Emean is proposed for the Steinkohlenbrikettler = emanating from the residues of Pechhydrierung b. These solids-rich fractions, which are no longer suitable for the hydrogenation, are referred to as desludging. In its original state, the sludge removal is worthless for cli, - briquetting in many cases due to its changing nature due to the operation of the hydrogenation process, since the briquettes produced with it do not solidify sufficiently due to the low calibration point of the binding agent. If one distills the desludging to desludging residues, one arrives at a grindable product, which is able to supply the binding agent structure of the briquettes, but the binding force has decreased so much that in comparison to pure tar pitch a quantity requirement for the same is at least twice as high Strength is required.

It has now been found, surprisingly, that a composite of coal emptying pitch and desludging or coal tecpitch and desludging residue with desludging results in binders which, in their effects, are far superior to the individual components of binders, not only the possibility of converting difficult-to-separate waste materials into high-value products In addition, the briquetting of hard coal experiences an increase, # increase d # -r economy "- because., which 'Zrh, # hu4, - equals the binding force of a Erspatid ; s- #Ln - -imnci, m'ü', ttei .

The production of the binders on which the invention is based will be illustrated using an example. If a plant has Loöt coal tar and 120t desludging available per day, the following operations are carried out through i. Distillation in the tar bubbles. Application ioöt tar, 35 t desludging; Output --- 85 t mixed pitch, consisting of 65% -, Tee #, ech, 359/0 desludging residue.

2. Mixing production in, a heated sheet container with agitator # - 85t 'mixed pitch. (according to i) + 85 t dec, atmm # -ung- # ' 170 t briquette binder.

Practical experiments have shown that briquettes in the above example can be reduced by 15% in relation to the consumption of binding agent compared to pure coal tar pitch. This success is all the more remarkable as the tar pitch in this mixture is only 32%, while the remainder of 68 % is due to desludging.

The combination of distillation and mixing changed To adapt production conditions without further ado and at the same time to be too similar, favorable Results 25u come. The new binders can be used both in powder form as well as on the way; the liquid hot briquette e, tti, el = g can be used 3 this depends on the nature of the raw materials.

Claims (2)

PATENT CLAIMS: i. Coal tar pitch for briquetting coal, characterized by the addition of pitch distilled and possibly not de-oiled residues of pitch hydrogenation. 2. Process for the preparation of the binders according to claim i, characterized in that -the distillation of coal tar with desludging on pitch together ih & r bladder ... is carried out and that This tar pitch or mixture pitch original desludging in one with agitator provided heatable container is added.