Process and apparatus for removing in particular in the synthesis gas extraction resulting slag from a slag bath tank

With a process for removing in particular in the synthesis gas extraction resulting slag from a container in a pressure vessel slag into a collection container for the slag, in the direction of gravity beneath the slag bath, wherein below the slag bath, if necessary, a means for breaking the slag and between the containers lock valve is provided, the appropriate procedures and systems of the subject species should be significantly improved at improving the slag deduction and avoid polluting vapors or fumes. This is achieved, that is below the sluice valve an upright with the liquid in the containers in contact, filled with a gas blowing space, in particular annular space, is provided, in which the pressure of the gas bubble is controlled by the gas supply in such a way that at least part of the slag-sluices / water collecting chamber located at the opening of the sluice valve, it flows in the direction of the slag bath against the direction of gravity.