EFFECT OF THE REAL STRUCTURE OF CRYSTALS ON SULFATIZATION OF TANTALONIOBATES

It is shown that the thermodynamic driving force of the sulfatization reaction depends, to a significant extent, on the depth of decompositi on of the tantalite-columbite particles and the degree of coherence of the interface. By computer calculations it is determined that mechani cal activation of tantalite-columbite produces fine chemical inhomogen eities in the near-surface layer of the activated particles caused by elastic interaction of iron and manganese atoms with dislocations. The formation of these inhomogeneities is the reason for the fact reveale d earlier that it is fairly easy to selectively extract the group-A ca tions [manganese(II) and iron(II)] from tantaloniobates with a number of acid solutions.