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Solid waste tionite generated in the sulfate process for TiO2 production is a secondary titanium resource with high silicon content. To recover titanium and remove silicon from the tionite, a process involving hydrothermal conversion, water washing, and acid leaching was proposed. To avoid Na2O loss, the formation of Na2TiSiO5 by-product was prevented by adding CaO. XRD, ICP-OES and FT-IR were used...
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