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Competency of chlorination roasting coupled water leaching process for potash recovery from K-feldspar: Mechanism and kinetics aspects
Korean Journal of Chemical Engineering ( IF 2.7 ) Pub Date : 2019-12-01 , DOI: 10.1007/s11814-019-0393-9
Sandeep Kumar Jena , Nilima Dash , Akshaya Kumar Samal , Pramila Kumari Misra

Potassium is an important mineral for biological functions. In this study, potassium was recovered from a low-grade potash mineral, feldspar through chlorination roasting followed by water leaching. NaCl and CaCl2 were used as additives for chlorination roasting independently The characterizations throughout the studies were carried out using a series of analytical and spectral techniques like XRD, SEM, FTIR, and Raman spectroscopy The effects of various experimental parameters such as particle size, roasting temperature, amounts of additives, and water leaching on potassium extraction were evaluated. Water leaching was found to be independent of leaching time, temperature, and agitator speed. During roasting, the formation of water-soluble phase was evident; this phase subsequently disappeared on water leaching. The potassium extraction kinetics in the presence of both the additives was satisfactorily corroborated by Ginstling-Brounshtein model. The activation energies for CaCl2 and NaCl roasting were calculated to be 90 and 122 kJ/mole, respectively. Under the same experimental conditions, 86% of potassium extraction (as potash value) was accomplished using CaCl2 as the additive, whereas the extraction in presence of NaCl was only up to 44%. The mechanism of potassium extraction was elucidated; the superior effectiveness of CaCl2 over NaCl in the extraction process was also explained.

中文翻译:

氯化焙烧耦合水浸工艺从钾长石中回收钾的能力:机理和动力学方面

钾是具有生物功能的重要矿物质。在这项研究中,钾是从低品位钾盐矿物长石中通过氯化焙烧和水浸法回收的。NaCl 和 CaCl2 独立用作氯化焙烧的添加剂 整个研究中的表征使用一系列分析和光谱技术,如 XRD、SEM、FTIR 和拉曼光谱 各种实验参数的影响,如粒度、焙烧温度评估了添加剂的量和钾提取过程中的水浸出。发现水浸出与浸出时间、温度和搅拌器速度无关。在焙烧过程中,水溶性相的形成很明显;该相随后在水浸出时消失。Ginstling-Brounshtein 模型令人满意地证实了两种添加剂存在下的钾提取动力学。CaCl2 和 NaCl 焙烧的活化能分别计算为 90 和 122 kJ/mole。在相同的实验条件下,86% 的钾提取(作为钾值)是使用 CaCl2 作为添加剂完成的,而在 NaCl 存在下的提取率仅高达 44%。阐明了提取钾的机理;还解释了 CaCl2 在萃取过程中优于 NaCl 的有效性。86% 的钾提取(以钾盐计)是使用 CaCl2 作为添加剂完成的,而在 NaCl 存在下的提取率仅高达 44%。阐明了提取钾的机理;还解释了 CaCl2 在萃取过程中优于 NaCl 的有效性。86% 的钾提取(以钾盐计)是使用 CaCl2 作为添加剂完成的,而在 NaCl 存在下的提取率仅高达 44%。阐明了提取钾的机理;还解释了 CaCl2 在萃取过程中优于 NaCl 的有效性。
更新日期:2019-12-01
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