A method for separating molybdenum in tungstate solution by ion exchange

Abstract

The invention discloses a method for separating molybdenum from a tungstate solution through ion exchange. The method includes the steps that trithiocyanuric acid is added into the molybdenum-containing tungstate solution to carry out vulcanization reaction, so that a tungstate solution containing thiomolybdate is obtained; the tungstate solution containing the thiomolybdate is subjected to ion exchange by adopting weak-base anion-exchange resin so as to adsorb the thiomolybdate, and a tungstate solution is obtained; and the weak-base anion-exchange resin loaded with the thiomolybdate is desorbed by an alkaline desorption solution, so that a molybdate solution is obtained. According to the method, the separating effect of molybdenum in the high-tungsten low-molybdenum solution is good, tungsten loss is little, operation is simple, no hydrogen sulfide is released in the vulcanization process, a hydrogen sulfide recovery facility is not needed, no oxidant is used in the desorption process, molybdenum is easy to recover, the service life of the resin is prolonged, and industrial application is facilitated.

Description

technical field [0001] The invention relates to a method for removing molybdenum from a tungstate solution, in particular to a method of vulcanizing a small amount of molybdenum in a molybdenum-containing tungstate solution through a special vulcanizing agent, and then removing and recovering it through ion exchange, which belongs to the metallurgical technology of rare metals field. Background technique [0002] Tungsten and molybdenum belong to the same subgroup in the periodic table of elements, and due to the contraction of the lanthanide series, the tungsten and molybdenum ions and atomic radii are similar, making the chemical properties of tungsten and molybdenum similar, and it is difficult to separate, so the separation of tungsten and molybdenum has always been tungsten Difficulties in metallurgical processes. The existing separation methods of tungsten and molybdenum include chemical precipitation method, solvent extraction method, ion exchange method and so on. ...

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Problems solved by technology

[0004] Although many scholars have done a lot of research on the separation of tungsten and molybdenum, and some of them have realized industrialization, the problem they are currently facing is that the grade of tungsten and molybdenum concentrates is gradually decreasing, and people have put forward more new requirements for metal materials. The mineral raw materials to be processed by enterprises will also become more and more complex. For example, in the Shizhuyuan Mine, a comprehensive polymetallic mine in my country, m(Mo) / m(WO 3 ) is about 2%, m(Mo) / m(WO 3 ) up to 5% or more

In industry, if traditional vulcanizing agents such as Na 2 S and (NH 4 ) 2 S, etc. have the problem of high cost, and there will be toxic gas hydrogen sulfide emissions in the production process, which will deteriorate the production environment, and the environmental friendliness is poor, and hydrogen sulfide gas recovery facilities need to be added; the ion exchange method is used to separate tungsten and molybdenum. During the process, thiomolybdate cannot be desorbed from the resin with an alkaline solution, and oxidants such as hydrogen peroxide and sodium hypochlorite must be added for desorption. The heat released during the oxidation process and the oxidant itself will affect the resin, shorten the service life of the resin, and return it to the subsequent process bring adverse effects

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