High purity alumina production by leaching-ion exchange process: Design and flowchart proposal

被引：1

作者：

dos Santos, Luis Henrique do Nascimento ^{[1
]}

Pereira, Barbara da Rocha ^{[1
]}

Rosset, Morgana ^{[1
]}

Espinosa, Denise Crocce Romano ^{[1
]}

Botelho Junior, Amilton Barbosa ^{[1
,2
]}

机构：

[1] Univ Sao Paulo, Dept Chem Engn, Sao Paulo, Brazil

[2] MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA

来源：

MINERALS ENGINEERING | 2024年 / 217卷

关键词：

Hydrometallurgy; Bauxite; High purity alumina; Leaching kinetic; RARE-EARTH-ELEMENTS; EXTRACTION; RECOVERY; BEHAVIOR; BATCH; TI;

D O I：

10.1016/j.mineng.2024.108946

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Growing demand for high-purity Al2O3 for the electronic market and green energy production, allied with the need to decrease waste generation and dam use, will impact the future of mining, and new processes should be developed. The present study aimed to develop a hydrometallurgical process to obtain high-purity Al2O3 from bauxite. Among the samples studied, BX03 had the highest Al2O3 (63.8 %) and lowest Fe2O3 content (4.3 %). Different acids were evaluated - H2SO4, HCl, HNO3, and H3PO4 - and the H2SO4 reaction achieved all Al leaching with the best technical-economic analysis (TEA). Purification experiments were carried out with ion exchange resins in batch reactions. The best purification parameters were 4 h of contacting time and mass of resin/volume of solution ratio as 1/10 at 45 degrees C in two stages. The iminodiacetate resin (Lewatit TP 207) achieved the best results and removed all Fe ions without losses. High-purity Al2O3 was further obtained by precipitation with NH4OH after calcination. Considering the leaching step costs, the proposed process may achieve up to US$ 63,022.91 in profit.

引用

页数：11

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