Patent ID: 8424785

Claim:
A process for removing hot slag originating from coal gasification or synthesis gas production, i.e., from a slag water bath housed by a first pressure vessel to one or several transfer vessels provided for the slag and arranged in the direction of gravity flow below the slag water bath, a crushing unit and/or device for slag bulking being fitted below the said slag bath, comprising: maintaining a stream of slag and liquid from the slag bath to the transfer vessel; reversing the downward flow of slag/liquid suspension in the transfer vessel to provide a reversed stream, the reversed stream is flowing upwards, in part or in whole, in a circular space formed partially by a shell wall; and homogenizing the reversed stream over a part of or the whole cross-sectional surface of an intermediate chamber; wherein the reversal of the slag/liquid suspension and the stream homogenised in the intermediate chamber permit a partial or complete separation of the particles in accordance with the grain size or density, the coarser particles settling in the transfer vessel and the finer particles being entrained by the reversed stream and discharged from the vessel.