Extraction processes are finding increasing application for the processing of uranium from raw materials. The high selectivity and the fluid aggregate state of the extraction agents give this method advantages over the previously known processes. This article gives data on the extraction of uranium from sulfate, nitrate, chloride and phosphate solutions and pulps, most frequently encountered in the hydrometallurgy of uranium. The extraction agents suitable for industrial use are the esters of carboxylic acids, the esters of phosphoric and phosphinic acids and also liquid cationexchange materials and anion-exchange materials, in a number of cases (in the exraction of uranium from colored solutions) have advantages over solid ion exchange materials. A system is described for the extraction of uranium from dense ore pastes.