Leaching Kinetics of the Pressure Decomposition of Wolframite with Sulfuric-Phosphoric Mixed Acid

IF 2.5 3区材料科学 Q3 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY

Journal of Sustainable Metallurgy Pub Date : 2024-08-21 DOI:10.1007/s40831-024-00899-y

Jigang He, Yiwei Luo, Tao Lu, Zhenqiang Wang, Xingyu Chen, Ailiang Chen, Xuheng Liu, Jiangtao Li, Lihua He, Fenglong Sun, Zhongwei Zhao

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Abstract

To further improve the decomposition efficiency of wolframite in sulfuric-phosphoric mixed acid, the leaching kinetics in pressurized system was studied. The effects of stirring rate, reaction temperature, sulfuric acid concentration, phosphoric acid concentration, and mineral particle size on the leaching process were investigated, and the data could be fitted by the Avrami equation with a fitting degree of 0.9824. When the stirring rate exceeds 500 r/min, the liquid phase mass transfer was relatively sufficient, and the apparent activation energy of the reaction was 41.98 kJ/mol, which indicated chemical reaction control. And the reaction characteristic parameter was 0.44, the influence index of mineral particle size was − 1.78, and the reaction order of sulfuric acid concentration and phosphoric acid concentration were 0.4 and 0.31, respectively. The kinetics equation of the pressure sulfuric-phosphoric acid decomposition wolframite was obtained. It provided a theoretical basis for the strengthening of practical decomposition of wolframite.

Graphical Abstract

Abstract Image

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钨矿与硫磷混合酸的压力分解浸出动力学

为了进一步提高黑钨矿在硫磷混合酸中的分解效率，研究了加压系统中的浸出动力学。研究了搅拌速率、反应温度、硫酸浓度、磷酸浓度和矿物粒度对浸出过程的影响，数据可用阿夫拉米方程拟合，拟合度为 0.9824。当搅拌速率超过 500 r/min 时，液相传质相对充分，反应的表观活化能为 41.98 kJ/mol，表明化学反应受控。反应特征参数为 0.44，矿物粒度的影响指数为-1.78，硫酸浓度和磷酸浓度的反应阶数分别为 0.4 和 0.31。得到了压力硫酸-磷酸分解黑钨矿的动力学方程。为加强黑钨矿的实际分解提供了理论依据。

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来源期刊

Journal of Sustainable Metallurgy Materials Science-Metals and Alloys

CiteScore

4.00

自引率

12.50%

发文量

151

期刊介绍： Journal of Sustainable Metallurgy is dedicated to presenting metallurgical processes and related research aimed at improving the sustainability of metal-producing industries, with a particular emphasis on materials recovery, reuse, and recycling. Its editorial scope encompasses new techniques, as well as optimization of existing processes, including utilization, treatment, and management of metallurgically generated residues. Articles on non-technical barriers and drivers that can affect sustainability will also be considered.