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Based on the Na<jats:sub>2<\/jats:sub>O-TiO<jats:sub>2<\/jats:sub> phase diagram and experimentally obtained results, appropriate alkali-fusion temperature and molar ratio (MO<jats:sub>x<\/jats:sub>\/Na<jats:sub>2<\/jats:sub>O\u2009+\u2009MO<jats:sub>x<\/jats:sub>) were determined to prepare soluble vanadium, tungsten salts, and sodium titanate. As results, the extraction efficiency of vanadium and tungsten was &gt;99% and sodium titanate as feedstock for making TiO<jats:sub>2<\/jats:sub> was obtained under the following alkali fusion conditions: Temperature, 950\u2009\u00b0C; reaction time, 20\u2009min; molar ratio, 0.5. When the molar ratio (MO<jats:sub>x<\/jats:sub>\/Na<jats:sub>2<\/jats:sub>O\u2009+\u2009MO<jats:sub>x<\/jats:sub>) was less than 0.5, complete liquidized product (eutectic melt of the feedstock and Na<jats:sub>2<\/jats:sub>CO<jats:sub>3<\/jats:sub>) was obtained at the given conditions. This method, compared to conventional alkali roasting, is advantageous for rapid synthesis of water-soluble compounds for leaching of vanadium and tungsten, and for use as feedstock for the preparation of TiO<jats:sub>2<\/jats:sub> by hydrometallurgical route.<\/jats:p>","DOI":"10.1038\/s41598-019-48767-0","type":"journal-article","created":{"date-parts":[[2019,8,23]],"date-time":"2019-08-23T10:02:36Z","timestamp":1566554556000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":28,"title":["Alkali fusion using sodium carbonate for extraction of vanadium and tungsten for the preparation of synthetic sodium titanate from spent SCR catalyst"],"prefix":"10.1038","volume":"9","author":[{"given":"In-Hyeok","family":"Choi","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gyeonghye","family":"Moon","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jin-Young","family":"Lee","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rajesh Kumar","family":"Jyothi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2019,8,23]]},"reference":[{"issue":"4","key":"48767_CR1","doi-asserted-by":"publisher","first-page":"1061","DOI":"10.1002\/ep.12328","volume":"35","author":"Q Yan","year":"2016","unstructured":"Yan, Q. et al. 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