According to different leaching agents, sodium salt decomposition can be divided into high pressure leaching of soda, high pressure leaching of sodium phosphate and high pressure leaching of sodium fluoride. The first two are commonly used process methods. Soda high-pressure leaching is widely used to treat scheelite, low-grade scheelite and wolframite. The technology is relatively mature, and this method is widely used abroad.
Sodium phosphate is used as a leaching agent. Under certain reaction conditions, the leaching rate of tungsten can reach 99.5%, and the effect on ore decomposition is obvious. For tungsten ore with high calcium content, adding a certain amount of sodium phosphate as an additive can improve the decomposition rate of tungsten ore. Although sodium fluoride can effectively decompose scheelite, the processing cost is too high and the environmental protection risk is difficult to be produced on an industrial scale.
Sodium Salt Decomposition Ion Exchange Method Flow Chart