METHOD OF REMOVING TUNGSTEN FROM MOLYBDATE SOLUTIONS Russian patent published in 2002 - IPC

FIELD: nonferrous hydrometallurgy. SUBSTANCE: when removing tungsten from solutions of molybdate by a method involving adjusting pH of solution and sorption of tungsten on anionite prepared by amination of polyacrylate matrix with polyethylene polyamine followed by desorption of tungsten, pH of solutions is adjusted to 7.1-8.1 and sorption of tungsten is effected on anionite prepared by amination of divinylbenzene cross-linked polyacrylate matrix with polyethylene polyamine. Proposed technique allows extensive removal of ammonium molybdate both at its low and high content. In this case, yield of tungsten-free molybdenum- containing product, as compared to conventional techniques, is raised by a factor of 1.5 to 2,4 depending on the initial tungsten content. Suitable working range of pH goes from 7.1 to 8.1 (instead of 7.3-7.9 as commonly is the case). EFFECT: simplified procedure and extended suitable pH range. 3 tbl, 3 ex