Tungsten and molybdenum are the traditional superior resources of China. With the increasing consumption and continuous development and utilization of high quality tungsten and molybdenum resources, complex ore of lower grade and impurity has to been dealt with. It increases the difficulty of the beneficiation and metallurgy from the processing of raw material, especially for some similar elements, such as tungsten and molybdenum separation. On the other hand, with the rapid development of science and technology, the user puts forward higher requirements on the product purity. The traditional eliminating molybdenum method not only has the problems of long process, heavy pollution, high tungsten loss and higher cost, but also the molybdenum content has a narrow range in material liquid. And the depth of molybdenum also can not meet the new requirements. In recent years, rising of molecular design has deep into the chemistry and molecular engineering, chemical industry, medicine, mineral processing and other fields. People have started from the macroscopic field of material into the substance of the microscopic world. Molecular structure with the aid of computer design intelligent system, and the computer simulation and other modern means of science and technology, people have been able to synthesis with a certain properties of special reagent, used to solve specific practical problems. Because tungsten molybdenum with first IVB clan in the periodic table of elements, although there are some properties differences between them, but these differences are not very clear, simple use of these tiny differences are difficult to deep separation of tungsten, molybdenum and efficiently. Therefore，the study on the efficient and economic method of eliminating molybdenum from sodium tungstate solution deeply becomes  a major topic in the study of tungsten metallurgy.

 

Next, let’s have a look at several effective eliminating molybdenum methods proved through a large number of experiments. First of all, let's take a look at the first approach - selective precipitation of eliminating molybdenum from sodium tungstate solution. On the basis of predecessors' successful experience, starting from the specific system of tungsten smelting process, by quantum chemistry, structure chemistry and molecular design theory as the foundation, the nature of the differences in tungsten, molybdenum compounds as the basis, after a lot of analysis and research, design, synthesis and successfully trial-produced for from Na2W04 and (NH4) 2 w04 selective efficient except of molybdenum in the solution precipitator M1152a, etc. These reagents and tungstate solution of molybdenum has a strong affinity, can be simple and mild conditions make molybdenum precipitation down, the stability of the formation of refractory compounds with solution of tungsten, hardly so as to realize the effective depth of tungsten, molybdenum separation. Experiment in use process need to pay attention to the precipitation agent type, the precipitation agent for in addition to the influence on the effect of molybdenum. In order to guarantee good except the molybdenum effect, at the same time as far as possible to reduce the reagent cost, for M1152a, in addition to the molybdenum agent dosage in 3-4 times the amount of theory is advisable. Finally, consider the rate of tungsten recovery in the process of eliminating the molybdenum from sodium tungstate solution to choose the most effective precipitation.