Jianghai brand low potassium sodium ammonium chloride is industrial ammonium chloride as raw material through a variety of processes, which strictly control the potassium, sodium content refined. Low potassium sodium ammonium chloride is mainly used in the production of tungsten and molybdenum by ion exchange, and can also be used in electronics, electroplating solution, circuit board and other industries.
At present, the low potassium sodium ammonium chloride produced by our factory is mainly used in tungsten industry to produce ammonium paratungstate. Its production method is: ion exchange method. The process is described as follows: sodium tungstate solution is prepared from tungsten concentrate after high pressure alkali boiling. After ion exchange column adsorption, other impurity ions such as phosphorus, arsenic, silicon, iron and manganese are removed from the solution. The tungstate ion on the resin was washed with low potassium and sodium industrial ammonium chloride, and a high purity ammonium tungstate (NH4）2WO4 solution was obtained. Ammonium paratungstate can be prepared by evaporation and cooking of ammonium tungstate solution.
In the process of production of para-ammonium tungstate, and strictly control the impurity content, especially the low melting point of potassium, sodium, if the potassium content is more than 10 PPM of para-ammonium tungstate, and sodium content is more than 15 PPM, the production of tungsten sharply drop melting point and seriously reduce the life of the product.
According to the characteristics of the tungsten industry production demand, our company develop and produce the low potassium sodium refined type industrial ammonium chloride. There is several key control procedures: One is the amount of control for potassium, sodium; Second is the dissolved recrystallization residence time of control for material ; Third is to wash water control, etc. After strictly controling of each process, potassium ≤15 PPM , sodium≤30 PPM , ammonium chloride ≥ 99.5% . It met customers' normal production demand , at the same time, and solve the problem in controlling the impurity content of para-ammonium tungstate.