通过 KOH 焙烧、H3PO4 沥滤和煅烧从钛铁矿中生产 α-Ti(HPO4)2-H2O、TiP2O7 和 (TiO)2P2O7

IF 4.8 2区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING
Ushan S. Kulathunga , Kusal D. Mendis , Ashen I. Mapa , Champa D. Jayaweera , Masaru Shimomura , Lalinda Palliyaguru , Pradeep M. Jayaweera
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引用次数: 0

摘要

一水α-Ti(HPO4)2-H2O(α-TiP)是一种前驱体材料,可用于获得从离子交换色谱法、化学催化到储能材料等多种重要化合物。本研究开发的新型合成程序显示,钛铁矿中的钛可转化为纯度较高的α-TiP。在合成钛铂的过程中,直接使用天然钛铁矿石和常见化学品(如 KOH、H3PO4、HCl 和 H2C2O4),凸显了本研究的重要意义。将摩尔比为 1:4 的钛铁矿和 KOH 混合物在 800°C 下焙烧 4 小时,将所有钛浓缩为钛酸钾,将铁浓缩为氧化铁。钛酸钾和氧化铁与 85%(重量比)的 H3PO4 酸反应后,会产生富含铁的浸出液,其形式为可溶性铁磷酸盐和白色沉淀物,被认定为 α-TiP。800°C 煅烧 α-TiP 会产生焦磷酸钛(TiP2O7)。与 α-TiP 共沉淀的残余铁通过使用络合酸(H3PO4 或浓盐酸)的多重洗涤步骤进一步去除。用草酸(H2C2O4)洗涤后,在煅烧过程中会产生沉淀,经鉴定为焦磷酸钛(TiO)2P2O7。制作了流程图,并用 X 射线衍射、X 射线荧光、热重和拉曼光谱技术检测了制备的 α-Ti(HPO4)2-H2O 和 (TiO)2P2O7 的化学特性和纯度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Production of α-Ti(HPO4)2·H2O, TiP2O7 and (TiO)2P2O7 from ilmenite by KOH roasting, H3PO4 leaching and calcination

Alpha titanium bis(hydrogenphosphate) monohydrate, α-Ti(HPO4)2·H2O, (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, H3PO4, HCl, and H2C2O4 highlights the significance of the present investigation. A mixture of ilmenite and KOH with a molar ratio of 1:4 was roasted at 800°C 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/w) H3PO4 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°C produces titanium pyrophosphate, TiP2O7. Residual iron that co-precipitated with α-TiP was further removed by multiple washing steps with complexing acids; H3PO4 or concentrated HCl. Washing with oxalic acid (H2C2O4) produces a precipitate upon calcination identified as titanyl pyrophosphate, (TiO)2P2O7. Flowcharts were developed and the chemical identities and the purity of the prepared α-Ti(HPO4)2·H2O and (TiO)2P2O7 were tested with X-ray diffraction, X-ray fluorescence, thermogravimetric, and Raman spectroscopic techniques.

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来源期刊
Hydrometallurgy
Hydrometallurgy 工程技术-冶金工程
CiteScore
9.50
自引率
6.40%
发文量
144
审稿时长
3.4 months
期刊介绍: Hydrometallurgy aims to compile studies on novel processes, process design, chemistry, modelling, control, economics and interfaces between unit operations, and to provide a forum for discussions on case histories and operational difficulties. Topics covered include: leaching of metal values by chemical reagents or bacterial action at ambient or elevated pressures and temperatures; separation of solids from leach liquors; removal of impurities and recovery of metal values by precipitation, ion exchange, solvent extraction, gaseous reduction, cementation, electro-winning and electro-refining; pre-treatment of ores by roasting or chemical treatments such as halogenation or reduction; recycling of reagents and treatment of effluents.
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