The Role of Msx Genes in Mammalian Developmenta

A method for roasting finely divided iron sulphide material in a manner to obtain a coarse, substantially sulphur-free product, the sulphide material consisting of pyrrhotite or a finely divided materal derived from a pyritic material in which thermally splittable sulphur has been driven off by partial roasting for example. According to the method, the sulphide material is first agglomerated to a particle size distribution suitable for fluidizing purposes and then roasted and hardened in a fluidized bed, whereafter the material is removed from the bed in a hot state.