Abstract: A process for separating trivalent iron from an aqueous chloride solution comprising contacting the aqueous solution with an organic phase containing an organophosphoric compound as an extracting agent for trivalent iron and at least 40 percent in volume of a long chain aliphatic alcohol, separating the iron-loaded organic phase from the aqueous solution, and re-extractng the iron from the iron-loaded organic phase by contacting the latter with water or acidulated water so as to produce an aqueous iron chloride solution.Owing to the high alcohol content of the organic phase, iron can be re-extracted with a small amount of water.

Abstract: A substituted 8-hydroxyquinoline is added to the alphahydroxyoxime extractant, which allows extracting germanium at lower acidity and with a better yield.

Abstract: Germanium is separated from an aqueous solution by means of a substituted 8-hydroxyquinoline extractant.Re-extraction of germanium from the extractant is carried out above 40.degree. C. and with an organic phase: aqueous phase volume ratio less than 1, whereby obtaining a high re-extraction yield.

Abstract: A process for re-extracting trivalent iron and hexavalent molybdenum from an organic phase containing an organophosphoric compound.In a first step the organic phase is contacted with such a quantity of water that most of the iron and only a minor part of the molybdenum are re-extracted.In a second step the partially unloaded organic phase is contacted with such a quantity of water that most of the molybdenum contained therein is re-extracted.This two-step re-extraction process permits obtaining a high reextraction yield for both molybdenum and iron, while ensuring the production of a concentrated eluate.

Abstract: Battery-grade MnO.sub.2 is produced by(a) treating a MnCl.sub.2 solution with Cl.sub.2 and Mg(OH).sub.2 whereby obtaining a MgCl.sub.2 solution that contains a MnO.sub.2 precipitate; and said MgCl.sub.2 solution contains at least 85 g/l of magnesium(b) allowing to digest the precipitate in the MgCl.sub.2 solution in presence of Cl.sub.2 under pressure;(c) separating the digested precipitate from the solution; and(d) washing and drying the precipitate.Owing to step (b), operating conditions in step (a) may be such that a concentrated MgCl.sub.2 solution is obtained, which is important for the further processing of that solution by pyrohydrolysis.