Recovery of Valuable Metals from Polymetallic Refractory Concentrate by a Sulfuric Acid Curing and Leaching Method

IF 2.5 4区工程技术 Q3 CHEMISTRY, ANALYTICAL Separations Pub Date : 2023-12-23 DOI:10.3390/separations11010007

Wei Jiang, Jilai Xue, Kaixi Jiang, Xunxiong Jiang, Shengdong Wang, Jinping Hu, Derek O Northwood, K. E. Waters, Hao Ma

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Abstract

Sulfuric acid curing and leaching is a promising technology for treating refractory ores. In this work, a refractory concentrate containing 3191 ppm uranium (U), 2135 ppm niobium (Nb), and 0.7% rare earth minerals (REMs) went through two stages: curing by high-concentration H2SO4 and leaching by low-concentration H2SO4. We investigated the behavior of those valuable metals during the two stages. For both curing and leaching, the operating parameters include the acid-to-solid ratio, time, temperature, and H2SO4 concentration. The recovery for U, Nb, and REMs was as high as 95%, 86%, and 73.5% using a curing acid-to-solid ratio of 1:1, curing temperature of 200 °C, curing time of 1 h, H2SO4 concentration of 98%, leaching liquid-to-solid ratio of 4:1, leaching time of 2 h, leaching temperature of 60 °C, and leaching H2SO4 concentration of 5 g/L. A “sulfuric acid curing–leaching-U extraction by N235–Nb recovery by resin adsorption–REMs’ recovery by resin adsorption” method was implemented, where the overall U, Nb, and REMs’ recovery reached 93.1%, 84.5%, and 69.6%, respectively.

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用硫酸固化和浸出法从多金属耐火精矿中回收贵金属

硫酸固化和浸出是处理难熔矿石的一项前景广阔的技术。在这项研究中，含有 3191 ppm 铀（U）、2135 ppm 铌（Nb）和 0.7% 稀土矿物（REMs）的难选冶精矿经过了两个阶段：高浓度 H2SO4 固化和低浓度 H2SO4 沥滤。我们研究了这些有价金属在这两个阶段中的表现。固化和浸出的操作参数包括酸固比、时间、温度和 H2SO4 浓度。在固化酸固比为 1:1、固化温度为 200 °C、固化时间为 1 小时、H2SO4 浓度为 98%、浸出液固比为 4:1、浸出时间为 2 小时、浸出温度为 60 °C、浸出 H2SO4 浓度为 5 克/升的条件下，U、Nb 和 REM 的回收率分别高达 95%、86% 和 73.5%。采用 "硫酸固化-浸出-N235 萃取-树脂吸附铌回收-树脂吸附 REMs 回收 "的方法，铀、铌和 REMs 的总体回收率分别达到 93.1%、84.5% 和 69.6%。

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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