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The Novel Lixiviants for Maximizing Antimony Extraction from Tetrahedrite-Rich Concentrate: Mechanism and Kinetic Studies
Mineral Processing and Extractive Metallurgy Review ( IF 5 ) Pub Date : 2021-07-12 , DOI: 10.1080/08827508.2021.1952201
Sajjad Aghazadeh 1 , Hadi Abdollahi 1 , Mahdi Gharabaghi 1 , Mirsaleh Mirmohammadi 1
Affiliation  

ABSTRACT

In this paper, the synergistic effects of novel reagents including glycine and EDTA on alkaline dissolution of tetrahedrite were fully investigated for the first time. Sample was characterized in terms of its chemical, mineralogical and morphological properties using XRD, ICP, SEM and EDS analyses. The results showed that tetrahedrite concentrate obtained from froth flotation experiment constitutes 14.04% Sb, 19.01% Cu, 5.4% Ca, 4.5% Fe, 1.8% Mg, 14.5% S, 3.08% Si and 3.67% Zn. The effects of important factors such as initial concentrations of glycine and EDTA, and leaching temperature were studied. According to the results of dissolution experiment, copper extraction was not improved with the addition of glycine and EDTA to Na2S-NaOH solution media; however, antimony extraction was remarkably enhanced. The results of kinetic studies showed that antimony dissolution data fit well to diffusion through product layer for Na2S-NaOH-glycine and surface chemical reaction for Na2S-NaOH-EDTA. Therefore, new kinetic relationships in terms of leaching and SCM parameters were developed for the first time. For antimony experiment via Na2S-NaOH-glycine, activation energy and pre-exponential factors were obtained 13.31 kJ.mol.−1 and 0.0108 min.−1 with R2 = 99.99% and for antimony experiment via Na2S-NaOH-EDTA, these values were found to be 40.76 kJ.mol.−1 and 868.35 min.−1 with R2 = 99.44% in temperature range between 313 and 373 K. The residual findings of this paper proved that antimony extraction improves notably when EDTA and glycine lixiviants were added into Na2S-NaOH alkaline solution, highlighting that new lixiviants’ combination effects are higher and stronger than single Na2S-NaOH solution which can bring more antimony particles from solid tetrahedrite structure into solution phase.



中文翻译:

最大化从富四面体精矿中提取锑的新型浸出剂:机理和动力学研究

摘要

本文首次全面研究了甘氨酸和EDTA等新型试剂对四面体碱溶解的协同作用。使用 XRD、ICP、SEM 和 EDS 分析对样品的化学、矿物学和形态学特性进行表征。结果表明,泡沫浮选得到的四面体精矿的组成为:Sb 14.04%、Cu 19.01%、Ca 5.4%、Fe 4.5%、Mg 1.8%、S 14.5%、Si 3.08%、Zn 3.67%。研究了甘氨酸和EDTA初始浓度、浸出温度等重要因素的影响。溶出实验结果表明,在Na 2中加入甘氨酸和EDTA并没有提高铜的萃取率。S-NaOH溶液介质;然而,锑的提取得到了显着提高。动力学研究结果表明,锑溶解数据与Na 2 S-NaOH-甘氨酸通过产物层的扩散和Na 2 S-NaOH-EDTA的表面化学反应非常吻合。因此,首次开发了关于浸出和 SCM 参数的新动力学关系。对于通过Na 2 S-NaOH-甘氨酸的锑实验,获得了13.31 kJ.mol的活化能和指前因子。-1和 0.0108 分钟。-1R 2  = 99.99%,对于通过 Na 2 S-NaOH-EDTA 进行的锑实验,发现这些值为 40.76 kJ.mol。-1和 868.35 分钟。-1,在 313 和 373 K 的温度范围内, R 2 = 99.44%。本文的剩余研究结果证明,在 Na 2 S-NaOH 碱性溶液 中加入 EDTA 和甘氨酸浸出剂后,锑的提取率显着提高,突出了新浸出剂的复合效果比单一的Na 2 S-NaOH溶液更高更强,可以将更多的锑颗粒从固态四面体结构带入溶液相。

更新日期:2021-07-12
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