Ting-ting LI, Yan-bai S, Si-kai Z, Yao-yu Y, Rui L, Shu-ling G, Cong H, De-zhou W (2019) Leaching kinetics of scheelite concentrate with sodium hydroxide inthe presence of phosphateTrans. Gaur RPS (2006) Modern hydrometallurgical production methods for tungsten. īlovská V, Bělina P, Šulcová P (2013) Synthesis of tungstate pigments of the formula MNd 2W 2O 10 (M = Ni, Zn, Mn). KeywordsĮuropean Commission (2020) Communication from the Commission to the European Parliament, the Council, the European Economic and Social Committee and the Committee of the Regions Tackling the challenges in commodity markets and on raw materialĭvořáček J, Sousedíková R, Vrátný T, Jureková Z (2017) Global tungsten demand and supply forecast. The purified solution was beneficiated to prepare a high grade AMT ((NH 4) 6♴H 2O: 9, m.p.: 98.7 ☌, density: 2.16 g/cm 3), which serves as an intermediate for some defined industries. The leachate at optimal conditions was treated to obtain a pure tungstate solution. The calculated activation energy of 6.93 kJ/mol supported the proposed diffusion mechanism. During leaching, parameters such as leachant concentration, reaction temperature, and particle size on ore dissolution were examined. Thus, preparation of ammonium metatungstate (AMT) from a Nigerian wolframite ore by hydrometallurgical technique was examined in sulphuric and phosphoric acid. This exceptional property makes it to be of high interest by industrialists for use in the engineering and manufacturing industries. The increasing demand for pure tungsten and its compounds due to their high tensile strength makes them a versatile material in catalyst, heavy alloy, cemented carbide, among others.
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