HYDROMETALLURGICAL METHOD FOR THE REUSE OF SECONDARY ZINC OXIDES RICH IN FLUORIDE AND CHLORIDE.

摘要

The present invention relates to a method for eliminating halides, in particular chlorides and fluorides, from secondary zinc oxides, for example Waelz or Primus oxides, including the steps of (1) stripping the secondary zinc oxides with sodium carbonate and separating the dry matter from the base liquid, (2) leaching at least one portion of the dry matter from step 1 using H2SO4, preferably until reaching a pH of 2.5 to 4, and separating the dry matter from the acid liquid, and (3) treating the liquid from step 2 by adding Al³⁺ ions and PO4 ^3- ions and a neutralising agent in order to eliminate the residual fluoride, preferably until reaching a pH of < 4, and separating the liquid from the dry matter containing the fluorides. The present invention relates to a method for eliminating halides, in particular chlorides and fluorides, from secondary zinc oxides, for example Waelz or Primus oxides, including the steps of (1) stripping the secondary zinc oxides with sodium carbonate and separating the dry matter from the base liquid, (2) leaching at least one portion of the dry matter from step 1 using H2SO4, preferably until reaching a pH of 2.5 to 4, and separating the dry matter from the acid liquid, and (3) treating the liquid from step 2 by adding Al³⁺ ions and PO4 ^3- ions and a neutralising agent in order to eliminate the residual fluoride, preferably until reaching a pH of < 4, and separating the liquid from the dry matter containing the fluorides. The invention relates to compounds of the formula (I), where the symbols have the meaning given in the specification, for use in a method for treating cancer, to use of these compounds for the manufacture of a pharmaceutical composition for the treatment of cancer, and to methods of treatment for said diseases employing a compound of formula (I).