Ammonium Metavanadate Fabricated by Selective Precipitation of Impurity Chemicals on Inorganic Flocculants

High purity ammonium metavanadate (NH4VO3) is the most vital chemical to produce V2O5, VO2, VN alloy, VFe alloy and VOSO4, which have some prospective applications for high strength steel, smart window, infrared detector and imaging, large scale energy storage system. NH4VO3 is usually produced by spontaneous crystalliza-tion from the aqueous solution due to its sharp dependence of solubility on the temperature. However, hazardous chemicals in industrial effluent, include phosphorate, silicate and arsenate, causing severe damage to the envir-onment. In this work, these impurities are selectively precipitated onto inorganic flocculants, while the vanadate dissolved in an aqueous solution keeps almost undisturbed. Therefore, high purity NH4VO3 is produced by the crystallization from the purified solution. By screening various flocculants and precipitating parameters, polyalu-minum sulfate with an optimal amount of 50 g/L, is demonstrated to selectively remove phosphorate, silicate and arsenate, corresponding to the removing efficiency of 93.39%, 97.11% and 88.31%, respectively. NH4VO3 from the purified solution holds a purity of 99.21%, in comparison with 98.33% in the product from the crude solution. This purifying technology cannot only produce NH4VO3 with high added value, but also reduce the environmen-tal pollution of waste liquid.

Automated summary

In this study, hazardous chemicals in industrial effluent, including phosphorate, silicate, and arsenate, are selectively precipitated onto inorganic flocculants, while the vanadate dissolved in an aqueous solution remains undisturbed. High purity NH4VO3 is produced by crystallization from the purified solution. Polyaluminum sulfate with an optimal amount of 50 g/L is demonstrated to selectively remove phosphorate, silicate, and arsenate with removing efficiencies of 93.39%, 97.11%, and 88.31%, respectively. The purity of NH4VO3 from the purified solution reaches 99.21%, compared to 98.33% in the product from the crude solution. This purification technology not only produces NH4VO3 with high added value but also reduces environmental pollution.