Abstract: A gas permeable structural part, particularly for use in burning and sintering devices, for withdrawal preferably of hot gases from a layer of granular material with a group of rods arranged parallel to one another and spaced from one another, which rods form a gap respectively therebetween, the gap width being smaller than the diameter of the smallest material granule. The grid rods have the smallest possible cross-section, and extend as short as possible in a direction perpendicularly to the surface of the structural part, solely assuming the mechanical pressure of the material loading the grid rods without deformation.

Abstract: An installation for the burning and/or sintering and cooling of cement clinker, lime, magnesite, dolomite and similar materials in granular or crushed form, especially adapted as a small-scale cement mill or lime mill, having two movable materials carrying platforms arranged inside a burn chamber, in a staggered relationship, and an intermediate wall subdividing the burn chamber into a forehearth for the upper platform and a main hearth for the lower platform. Blowers supply combustion air, draw the used burn gases through air permeable back walls above the platform, recirculate them into the changing shaft to dry and preheat the materials, and cool the sintered materials in the cooling shaft. An aftersinter platform or rotating aftersinter kiln may be arranged between the lower platform and the cooling shaft.