Tungsten is an indispensable strategic metal and occupies an important position in strategic reserves. In view of the current resource situation, it is an inevitable trend for scheelite to replace black tungsten and the strategic choice for the sustainable development of the tungsten industry.
However, scheelite resources are poor and are accompanied by more impurities such as molybdenum and phosphorus. Tungsten and molybdenum belong to the VIB group in the periodic table. Due to the influence of lanthanide contraction, the properties of tungsten and molybdenum are very similar. The separation of molybdenum has become a key problem to be solved in tungsten metallurgy.
At present, the separation methods of tungsten and molybdenum are mostly based on the fact that tungsten is oxygen-philic and molybdenum is sulfur-philic. First, the alkaline sodium tungstate solution is adjusted to neutral or weak alkalinity with acid, and then S2_ or HS_ is added to make the molybdate ions in the solution preferentially converted into thiomolybdate ions. Then, the significant difference in the properties of thiomolybdate and tungstate is used to separate tungsten and molybdenum by precipitation, extraction, ion exchange adsorption and other means.
These methods are all based on the separation of tungsten and molybdenum generated by thiomolybdate, which can achieve deep removal of molybdenum in tungstate solutions with low molybdenum content (Mo/WO3<2%). However, when the molybdenum content is high (Mo/WO3>2%), the above methods still have problems in terms of molybdenum removal depth, molybdenum removal cost and environmental protection, and are difficult to meet the needs of industrial production.
In order to selectively extract and separate molybdenum from the high-phosphorus tungsten-molybdenum mixed solution, the high-phosphorus tungsten-molybdenum mixed solution can be treated by controlling the acid concentration and adding hydrogen peroxide, and then adding an extractant to achieve the extraction and separation of tungsten and molybdenum under high-phosphorus conditions, providing a simple and cost-effective extraction method for the industrial high-phosphorus tungsten-molybdenum leaching solution of tungsten-molybdenum ore.
The extraction and separation stage of tungsten and molybdenum has high requirements for equipment, which requires us to choose extraction equipment with stable performance, corrosion resistance, high extraction efficiency and good extraction effect. Zhengzhou Tiei Extraction launched the CWL-M series centrifugal extractor. This centrifugal extraction methods is different from the traditional liquid-liquid extraction method. It is a green extraction process developed based on the principles of cation exchange and complex extraction in metal extraction and the new CWL-M new extraction equipment.
If you want to know more about the CWL-M series centrifugal extractor, please contact us.
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