Abstract Ilmenite is major source of titanium dioxide production and contains high concentration of iron. It is crucial to selectively remove iron impurities during the titanium production process. The present study investigated the acid and flux fusion digestion techniques for complete dissolution of ilmenite and subsequent separation of iron and titanium by precipitation process. Analytical results indicated that the Na2HPO4/NaH2PO4·H2O, Na2B4O7 and LiBO2 flux fusion procedures were the most effective for complete dissolution of ilmenite mineral. The separation of Fe(II) and Ti(IV) from the phosphate fused solution by selective precipitation was studied using phenanthroline (phen), sodium tetraphenylborate (NaTPB) and 2-mercaptopyridine N-oxide sodium salt (NaPT) as precipitants. The combination of phen and NaTPB showed poor selectivity for the precipitation of either Ti(IV) or Fe(II) and both metals collectively precipitated under the investigated experimental conditions. Negligible selectivity was observed when only sodium tetraphenylborate was used. The selective separation of Fe(II) and Ti(IV) from fused solution using NaPT as precipitant was extremely successful with 100(1)% Fe(II) recovered in the precipitate (no titanium observed in precipitate) while 99.6(1)% Ti(IV) remained in the filtrate (no iron observed in the filtrate).

中文翻译：

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从钛铁矿中分离铁和钛的选择性沉淀研究

摘要 钛铁矿是生产二氧化钛的主要来源，含有高浓度的铁。在钛生产过程中选择性去除铁杂质至关重要。本研究调查了用于钛铁矿完全溶解和随后通过沉淀过程分离铁和钛的酸和熔剂熔融消化技术。分析结果表明，Na2HPO4/NaH2PO4·H2O、Na2B4O7 和LiBO2 熔剂熔合程序对钛铁矿完全溶解最有效。使用菲咯啉 (phen)、四苯基硼酸钠 (NaTPB) 和 2-巯基吡啶 N-氧化物钠盐 (NaPT) 作为沉淀剂，研究了通过选择性沉淀从磷酸盐熔融溶液中分离 Fe(II) 和 Ti(IV)。phen 和 NaTPB 的组合对 Ti(IV) 或 Fe(II) 的沉淀选择性较差，并且两种金属在所研究的实验条件下共同沉淀。当仅使用四苯基硼酸钠时，观察到的选择性可以忽略不计。使用 NaPT 作为沉淀剂从熔融溶液中选择性分离 Fe(II) 和 Ti(IV) 非常成功，在沉淀物中回收了 100(1)% Fe(II)（在沉淀物中没有观察到钛），而 99.6(1)% Ti(IV)保留在滤液中（在滤液中没有观察到铁）。