首页|从勃姆石-高岭石型高硅铝土矿中盐酸浸出铁的机理与动力学

从勃姆石-高岭石型高硅铝土矿中盐酸浸出铁的机理与动力学

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利用XRD、ICP-OES、TG/DSC、SEM、TEM和穆斯堡尔(Mössbauer)光谱研究来自俄罗斯阿尔汉格尔斯克地区Severoonezhsk铝矿中铝土矿的化学和矿物组成,发现该铝土矿的含铁矿物包括铝针铁矿(α-Fe1-xAlxOOH)、铝赤铁矿(α-(Fe1-xAlx)2O3)、正方铝针铁矿(β-Fe1-xAlxO(OH,Cl))和铬铁矿(FeCr2O4).在温度为100℃、HCl浓度为10％,固液比为1:10及浸出时间为60 min的条件下,盐酸浸出铝土矿的铁浸出率为82.5％,而铝的损失不到铝土矿中总铝含量的4.5％.铁浸出过程的动力学分析表明,温度为90～100℃时,扩散是浸出过程的速率限制环节.铝土矿浸出渣含有微量的α-Fe1-xAlxOOH和β-Fe1-xAlxO(OH,Cl),大部分铁呈FeCr2O4形态.除铁氧化物外,铝土矿盐酸浸出渣中铬和钙氧化物的含量也显著降低.含氯化铁的浸出液含有稀土元素(REE):6.8 mg/L Sc、4.1 mg/L Ce和2.3 mg/L Ga.
Mechanism and kinetics of iron extraction from high silica boehmite-kaolinite bauxite by hydrochloric acid leaching
The chemical and mineral compositions of bauxite recovered from the Severoonezhsk Bauxite Mine (Arkhangelsk region, Russia) were studied by XRD, ICP-OES, TG/DSC, SEM, TEM, and Mössbauer spectroscopy. The iron-containing minerals of the bauxites were found to comprise alumogoethite (α-Fe1-xAlxOOH), alumohematite (α-(Fe1-xAlx)2O3), alumoakaganeite (β-Fe1-xAlxO(OH,Cl)), and chromite (FeCr2O4). The efficiency of Fe extraction from the bauxite by HCl leaching was 82.5％ at 100 ℃, HCl concentration of 10％, solid/liquid ratio of 1:10, and the process duration of 60 min, with aluminum loss from the bauxites below 4.5％ of the total Al contents in the bauxite. Analysis of the kinetics of the iron leaching process proved diffusion to be the limiting stage of the process at 90-100 ℃. Bauxite residue after leaching presented traces of α-Fe1-xAlxOOH and β-Fe1-xAlxO(OH,Cl), and most of the iron content was in the FeCr2O4. In bauxite residue after HCl leaching, in addition to iron oxide, the contents of chromium and calcium oxides significantly decreased. The iron chloride liquor after leaching contained the rare earth elements (REE) of 6.8 mg/L Sc, 4.1 mg/L Ce and 2.3 mg/L Ga.

bauxiteacid leachingiron extractionkineticsMössbauer spectroscopy

Dmitry VALEEV、Denis PANKRATOV、Andrei SHOPPERT、Artem SOKOLOV、Alexandr KASIKOV、Alexandra MIKHAILOVA、Cristian SALAZAR-CONCHA、Ilia RODIONOV

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Laboratory of Sorption Methods,Vernadsky Institute of Geochemistry and Analytical Chemistry ofthe Russian Academy of Sciences,119334 Moscow,Russia

Department of Chemistry,Lomonosov Moscow State University,119991 Moscow,Russia

Department of Non-ferrous Metals Metallurgy,Ural Federal University,620002 Yekaterinburg,Russia

Tananaev Institute of Chemistry,Kola Science Centre of the Russian Academy of Sciences,184209 Apatity,Russia

Laboratory of Crystal Structure Studies,A.A.Baikov Institute of Metallurgy and Materials Science,Russian Academy of Sciences,119334 Moscow,Russia

Universidad Austral de Chile,Valdivia,Chile

Graphite Innovation and Technologies,Dartmouth NS,Canada

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铝土矿 酸浸 铁提取 动力学 穆斯堡尔光谱

aMinistry of Science and Higher Education of the Russian Federation(scientific topic

0137-2019-0023

2021

10.1016/S1003-6326(21)65721-7

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCDCSCDSCI
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2021.31(10)
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