Rubidium and Potassium Extraction from Granitic Rubidium Ore: Process Optimization and Mechanism Study
Rubidium and Potassium Extraction from Granitic Rubidium Ore: Process Optimization and Mechanism Study
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DOI：
10.1021/acssuschemeng.7b04445
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发表时间：
2018-02
影响因子：
8.4
通讯作者：
Peng Xing;Chengya Wang;Bao-zhong Ma;Ling Wang;Zhang Wenjuan;Yong-qiang Chen
中科院分区：
文献类型：
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作者：
Peng Xing;Chengya Wang;Bao-zhong Ma;Ling Wang;Zhang Wenjuan;Yong-qiang Chen
到目前为止，人们对利用花岗岩铷矿提取铷知之甚少。本文研究了硫酸焙烧、还原分解和碱浸三种方法从花岗质铷矿中提取铷和钾的可行性。此外，本文还从矿物学和热力学的角度对萃取机理进行了研究。在最佳条件下，Rb和K的萃取率分别达到94%和92%以上。矿物学分析表明，Rb以类质同象的形式分散于云母（黑云母和白云母）和钾长石中。云母在硫酸焙烧过程中转化为硫酸盐。增加煤的用量、分解温度和时间有利于硫酸盐的分解。硫酸盐在还原分解过程中转化为氧化铝和硫酸钾。钾长石的基本结构在碱性成矿阶段基本不变。
Thus far, little is known about the use of granitic rubidium ore for the extraction of rubidium. Herein, we examined the extractability of rubidium and potassium from granitic rubidium ore via sulfuric acid baking, reductive decomposition, and alkaline leaching. In addition, the extraction mechanism was studied by using interdisciplinary approaches based on the mineralogy and thermodynamics. Under the optimum conditions, more than 94% and 92% of Rb and K were extracted, respectively. Mineralogical analysis suggests that the Rb is scatted in micas (biotite and muscovite) and potassium feldspar in the form of isomorphism. Micas were transformed into sulfates during the sulfuric acid baking process. Increasing the dosage of coal, the decomposition temperature, and the time was conducive to the decomposition of sulfates. The sulfates were transformed into aluminum oxide and potassium sulfate during the reductive decomposition process. The basic structure of potassium feldspar was unchanged in the stages of ba...