Process for drying brown coal of high water content

Details Process for drying brown coal of high water content Process for drying brown coal of high water content

1986-11-05

1988-05-03

Hruskoci, Peter

Liquid purification or separation

Processes

Ion exchange or selective sorption

34 9, 34 12, 34 36, 44620, 209 3, 209 5, 209 10, 209 11, 210667, 210692, 210694, 210710, 210769, 210806, C02F 128

Patent

active

047418370

ABSTRACT:
For the purpose of increasing the efficiency during drying of brown coals having a high water content and for the purpose of facilitating the purification of process waste water resulting in a drying process according to Fleissner it is proposed to spray hot water onto the raw coal and to separate the proportion in fine grain having a maximum grain size of 5 mm, preferably of 1 mm. In the following, the proportion in fine grain is subjected to an adsorption stage (5), noting that after a reaction time of at least 1 min, preferably of 2 to 5 min, a major portion of the soluble substances burdening the waste water becomes adsorbed on this fine grain. Subsequently, the waste water is further purified after a flocculating step in a flocculating reactor (6) and after a separating step (8) for separating solid matter, for which purpose can be used sand filters (10), adsorbing resins and activated carbon. The separated process water can be used as feed water for a steam production in a combustion plant (13) and be partially used for rinsing the sand filters (10).

REFERENCES:
patent: 3763040 (1973-10-01), Timpe et al.
patent: 4303531 (1981-12-01), Kawabata et al.

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