Sodium paratungstate is a colorless triclinic crystal that has similar structure to ammonium paratungstate composition. Its chemical formula is Na10 (H2W12O42) •27H2O, molecular weight is 3596.50, and proportion is 3.987 (at 14°C). Characteristics of Sodium Paratungstate 1. It dissolves in cold water. 2. It decomposes in hot water. It begins to lose water if it is heated to 100°C. 3. It is roughly equivalent to 12 aggregation state in solution. Metatungstate is available if continue to add acid to polymerization.…

Cobalt tungstate, also called cobalt tungsten oxide, is widely applied as dingal material in antiknock, catalyst, pigment additive and microwave dielectric ceramic. Its formula is CoWO4 and CAS No. is 12640-47-0. Producing Method Adopt sodium tungstate and cobalt chloride as raw materials to prepare nanometer tungstate cobalt powder by using lithium nitrate – sodium nitrate molten salt method. The mass ratio of the molten salt to the cobalt tungstate precursor is 6: 1. React at 210, 270 and 340 °C…

Cadmium tungstate is also known as cadmium tungsten oxide or CWO. Its CAS number is 7790-85-4, molecular formula is CdWO4, and molecular weight is 360.25. The cadmium tungsten oxide has a melting point of 1325°C and a density of 7.9g/cm3. The code of safety instructions is 60-61. The hazard code is 20/21/22-50/53. The dangerous mark is Xn, N. And the shipping number of dangerous goods is UN 2570 6.1/PG 3. Application The cadmium tungstate single crystal is a scintillation detector…

99.5% tungsten trioxide can be prepared by complex salt method. Why adopt complex salt method for the preparation of 99.5% WO3? Complex salt method to produce tungsten trioxide powder has the following advantages: 1. Low production costs, significant economic benefits. 2. For producing many types of tungsten trioxide powder, including coarse tungsten trioxide powder, medium tungsten trioxide powder, fine tungsten trioxide powder and ultrafine tungsten trioxide powder. 3. There is no special selectivity to tungsten ore so that it is…

99.95% tungsten trioxide can be prepared by normal temperature extraction – normal temperature reextraction method to obtain ammonium paratungstate (APT) and then heat APT to a certain temperature for tungsten trioxide powder. Producing Method The wolframite is pressure boiled to obtain sodium tungstate solution. After pretreatment, extract active tungsten from the solution with organic reagents (various amines). That means purification and transformation effect are available. The obtained pure tungsten solution is treated by evaporative crystallization to get high-purity APT. Then,…

99.9% tungsten trioxide is a yellow powder that is insoluble in water and soluble in alkali. It can be used to produce tungsten powder. Tungsten Trioxide Hydrogen Reduction Tungsten trioxide hydrogen reduction, a traditional high-volume production technology, is one of the producing methods of tungsten powder. The process is generally divided into two stages: 1. The first stage: Reduce tungsten trioxide to tungsten dioxide under 500~700°C. 2. The second stage: Reduce tungsten dioxide to tungsten powder under 700~900°C. The detailed…