Tungsten Oxide

The crystalization method of evaporation and extraction method in the preparation of APT crystallization liquor treatment.  Leaving about 5% -10% of the WO3 and part of the S, P, As, Mo, K, Na and other impurities, resulting in it can not directly return to the process, in order to improve the  recycle of metal, it is necessary to set up auxiliary processes to recycle WO3 in the liquor. The residual alkali decomposition method is characterized by the use of tungsten concentrate decomposition of sodium tungstate in the process of recycle of residual NaOH solution with the liquor reaction, turn the WO 3  directly into Na 2 WO 4  solution, after remove the molybdenum solution into the main purification process and deal with Na 2 WO 4 , and also remove the phosphorus, arsenic, tin and other impurities, the transformation equation is: 2NaOH +(NH 4 ）2WO 4 ===Na 2 WO 4 + 2NH 4 OH 2NaOH +(NH 4 )2MoO 4 ===Na 2 MoO 4 +2NH 4 OH The...

The crystalization method of evaporation and extraction method in the preparation of APT will produce crystallization liquor, leaving about 5% -10% of the WO 3  and part of the S, P, As, Mo, K, Na and other impurities. Resulting in it can not directly return to the process of use , in order to improve the metal recycle, it is necessary to set up auxiliary processes to recycle WO 3  in the liquor. To contain large amounts of NH 4 Cl crystallization liquor of ammonium paratungstate , ion exchange method can be used to recycle tungsten concentrate and transformed into Na 2 WO 4  and return to the main process. Ammonium paratungstate crystallization liquor treatment of ion exchange need to adjust the pH value of hydrochloric acid to 3-4, through the weak alkaline anion exchange resin layer, where the tungsten, molybdenum and impurity phosphorus, arsenic, silicon with the same polyacid or heteropoly acid acid anion adsorption, the prese...

The crystalization method of evaporation and extraction method in the preparation of APT will produce crystallization liquor, leaving about 5% -10% of the WO3 and part of the S, P, As, Mo, K, Na and other impurities. Resulting in it can not directly return to the process of use , In order to improve the recycle of metal , it is necessary to set up auxiliary processes to recycle WO3 in the liquor. Hydrochloric acid adjustment method is a new occurrence of ammonium paratungstate crystallization liquor treatment process, it low cost, short process, and the equipment is simple. Hydrochloric acid method is mainly by using the reaction of strong acid against weak acid, adding suitable amount of hydrochloric acid into APT crystallization liquor, S 2-  is generated to H 2 S and volatilize from the liquor, tungsten is precipitated in the form of tungstic acid. Other few phosphorus, arsenic, tin and some impurities with most of cations like ...

The crystalization method of evaporation and extraction method in the preparation of APT will produce crystallization  liquor, leaving about 5% -10% of the WO 3  and part of the S, P, As, Mo, K, Na and other impurities. Since the APT crystallized  liquor contains a large number of impurity elements, it can not be directly returned to the process, in order to improve the metal recycle, it is necessary to set the auxiliary process to recycle the  of WO 3 . Due to the low energy consumption of membrane separation technology, it’s easy to achieve continuous operation and management, the process is easy to enlarge, the equipment is compact, it occupies a limited area and easy to use with other processes. In recent years, it widely attracted by the industry. Nano-Membrane filtration method is based on nano filtration equipment and put forward on the basis of great achievements. Nano membrane  filtration  was deve...