Tungsten Oxide

Sodium hydroxide decomposition is the main process for tungsten mineral raw materials. In the alkaline system, phosphorus, arsenic, silicon, molybdenum, tin and other elements contained in the mineral are leached to varying degrees and become the main impurities in the crude sodium tungstate solution. Some scholars have found that when sodium hydroxide decomposes tungsten ore, the calcium content of raw materials is beneficial to inhibit the leaching of impurities such as phosphorus, arsenic and silicon, and the leaching rate of these impurities decreases with the increase of calcium content. The results show that the oxy acids of phosphorus, arsenic and silicon can form insoluble compounds with calcium, and these precipitates can still exist stably under the condition that scheelite has been decomposed. Because of this, in the purification process of crude sodium tungstate solution, adding appropriate amount of Ca(OH) 2  can also remove the above three impurities. The precipitatio...

Hunan Shizhuyuan Tungsten Polymetallic Mining Area is a large deposit with a variety of minerals, with up to 143 kinds of mineral varieties. It is mainly composed of tungsten, tin, bismuth and molybdenum, and is rich in fluorite, copper, lead and zinc , sulfur, iron, gold, silver, beryllium, niobium, tantalum and other minerals, the economic value is difficult to estimate. Shizhuyuan ore mineral embedded in the complex size of the mineral industry is recognized by the most difficult mineral processing. The ratio of wolframite and scheelite ore is 3:7, and a lot of fluorite, molybdenum and bismuth are associated with it. In the early stage, shizhuyuan using the traditional method of heating and flotation to 733 oxidation of paraffin soap as a collector, the total recovery of tungsten ore is only 40-50%, a large number of waste of resources to make the economic benefits of the mine hesitant. In order to get rid of the waste of tungsten resources at an early date, at the...