Alpha titanium bis(hydrogenphosphate) monohydrate, α-Ti(HPO)·HO, (α-TiP) is a precursor material utilized to obtain a broad range of important compounds having a great deal of applications ranging from ion-exchange chromatography, chemical catalysis to energy storage materials. The novel synthetic procedure developed in this study shows a higher conversion of titanium in ilmenite to α-TiP with a good purity. For the synthesis of TiPs, the direct use of natural ilmenite ore with commonly available chemicals such as KOH, HPO, HCl, and HCO highlights the significance of the present investigation. A mixture of ilmenite and KOH with a molar ratio of 1:4 was roasted at 800 for 4 h to concentrate all the titanium to potassium titanate and iron to iron oxide. A reaction between potassium titanate and iron oxide with 85% (/w) HPO acid results in a leachate rich in iron in the form of soluble iron phosphates and a white precipitate identified as α-TiP. Calcination of α-TiP at 800 produces titanium pyrophosphate, TiPO. Residual iron that co-precipitated with α-TiP was further removed by multiple washing steps with complexing acids; HPO or concentrated HCl. Washing with oxalic acid (HCO) produces a precipitate upon calcination identified as titanyl pyrophosphate, (TiO)PO. Flowcharts were developed and the chemical identities and the purity of the prepared α-Ti(HPO)·HO and (TiO)PO were tested with X-ray diffraction, X-ray fluorescence, thermogravimetric, and Raman spectroscopic techniques.

中文翻译：

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钛铁矿KOH焙烧、H3PO4浸出、煅烧生产α-Ti(HPO4)2·H2O、TiP2O7和(TiO)2P2O7


α-二（磷酸氢）钛一水合物，α-Ti(HPO)·H2O，(α-TiP) 是一种前体材料，用于获得广泛的重要化合物，具有广泛的应用，包括离子交换色谱、化学催化到储能材料。本研究开发的新型合成程序表明，钛铁矿中的钛转化为纯度良好的 α-TiP 的转化率较高。对于 TiP 的合成，直接使用天然钛铁矿矿石与常用化学品（如 KOH、H3PO、HCl 和 HCO）凸显了本研究的重要性。将摩尔比为 1:4 的钛铁矿和 KOH 的混合物在 800 ℃ 下焙烧 4 h，将所有的钛浓缩为钛酸钾，将铁浓缩为氧化铁。钛酸钾和氧化铁与 85% (/w) HP​​O 酸发生反应，产生富含可溶性磷酸铁形式铁的渗滤液，并产生白色沉淀物，称为 α-TiP。 α-TiP 在 800 ℃下锻烧生成焦磷酸钛 TiPO。通过使用络合酸的多次洗涤步骤进一步去除与 α-TiP 共沉淀的残留铁； HPO 或浓 HCl。用草酸 (HCO) 洗涤在煅烧后产生沉淀，确定为焦磷酸氧钛 (TiO)PO。制定了流程图，并通过 X 射线衍射、X 射线荧光、热重和拉曼光谱技术测试了制备的 α-Ti(HPO)·H2O 和 (TiO)PO 的化学特性和纯度。