Accumulation of Particles in an Annular Centrifugal Contactor Cascade and the Effect upon the Extraction of Nitric Acid

IF 2.5 4区工程技术 Q3 CHEMISTRY, ANALYTICAL

Separations Pub Date : 2024-05-23 DOI:10.3390/separations11060163

A. Baker, Alex Fells, Natalia Domenech-Garcia, Chris J. Maher, Bruce C. Hanson

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Abstract

Centrifugal contactors (CCs) are a technology candidate for the development of advanced reprocessing flowsheets. While they offer many advantages, such as process intensification, there are still uncertainties regarding their industrial deployment. The presence of particles in the process streams in particular may present a challenge to both performance and operability. Preliminary studies have been undertaken to evaluate the accumulation of particles in the contactors and the effect upon the extraction behaviour of nitric acid. Aluminium oxide (Al2O3) particles were suspended in the aqueous feed solution during the operation of a three-stage, 40 mm diameter CC cascade. The presence of insoluble solid particles in the aqueous feed, up to 7 g/L, were not observed to affect phase separation and entrainment under the experimental conditions investigated. The particles were centrifuged out of solution and accumulated as a thin cake/bed in the rotors of each stage. This work also illustrates that particles do entrain through the cascade. The predominant effect on the rate of accumulation was particle concentration in the aqueous feed solution, and increasing solids loading was observed to have an impact upon the extraction of nitric acid across the cascade.

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环形离心接触器级联中的颗粒积聚及其对硝酸萃取的影响

离心接触器（CC）是开发先进后处理流程的候选技术。虽然它们具有工艺强化等诸多优势，但在工业应用方面仍存在不确定性。特别是工艺流中颗粒的存在可能会对其性能和可操作性构成挑战。我们进行了初步研究，以评估颗粒在接触器中的累积情况及其对硝酸萃取行为的影响。在直径为 40 毫米的三级 CC 级联运行期间，氧化铝 (Al2O3) 颗粒悬浮在进料水溶液中。在所研究的实验条件下，水溶液进料中存在的不溶固体颗粒（最高达 7 克/升）不会影响相分离和夹带。这些颗粒从溶液中离心出来，在每个阶段的转子中堆积成薄饼/床。这项研究还表明，颗粒确实通过级联夹带。对积聚速度影响最大的是进料水溶液中的颗粒浓度，而且据观察，固体负荷的增加会对整个级联的硝酸萃取产生影响。

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来源期刊

Separations Chemistry-Analytical Chemistry

CiteScore

3.00

自引率

15.40%

发文量

342

审稿时长

12 weeks

期刊介绍： Separations (formerly Chromatography, ISSN 2227-9075, CODEN: CHROBV) provides an advanced forum for separation and purification science and technology in all areas of chemical, biological and physical science. It publishes reviews, regular research papers and communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. There are, in addition, unique features of this journal: Manuscripts regarding research proposals and research ideas will be particularly welcomed. Electronic files and software regarding the full details of the calculation and experimental procedure, if unable to be published in a normal way, can be deposited as supplementary material. Manuscripts concerning summaries and surveys on research cooperation and projects (that are funded by national governments) to give information for a broad field of users. The scope of the journal includes but is not limited to: Theory and methodology (theory of separation methods, sample preparation, instrumental and column developments, new separation methodologies, etc.) Equipment and techniques, novel hyphenated analytical solutions (significantly extended by their combination with spectroscopic methods and in particular, mass spectrometry) Novel analysis approaches and applications to solve analytical challenges which utilize chromatographic separations as a key step in the overall solution Computational modelling of separations for the purpose of fundamental understanding and/or chromatographic optimization