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首页> 外文期刊>Chemical geology >Irreversibility of sorption of cobalt to goethite (α-FeOOH) and disparities in dissolution of aged synthetic Co-goethite
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Irreversibility of sorption of cobalt to goethite (α-FeOOH) and disparities in dissolution of aged synthetic Co-goethite

机译：钴对甲酸酯（α-FeOOH）的不可逆转性和老化合成合成型合成型合成型合成型合成的差异

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Abstract The behaviours of incorporated cobalt in goethite during desorption and dissolution is fundamental to our understanding of the best extraction techniques for maximum cobalt recovery. Here, Surface Complexation Modelling, desorption and dissolution of aged synthetic Co-goethite was investigated to demonstrate the transition between surface complexion, surface precipitation and structural incorporation in goethite with different amounts of cobalt found in oxic laterites. Surface Complexation Modelling of cobalt sorption on goethite reveals existence of both surface complexation and polynuclear complexes. Surface complexation starts at a low surface loading (≥0.004wt% Co) to form Fe(OH)2Co, and as uptake (0.03 to 0.2wt% Co) increases, two surfaces complexes, Fe(OH)2Co and (FeOH)2Co, are formed. Additional increases in concentration (0.45 to 1.7wt%) leads to the formation of poly-nuclear complexes (e.g., (FeOH)3Co2) co-existing with other complexes. Structural incorporation would be manifest if Co sorption was irreversible. We find that after four weeks of sorption about 55 to 70% of cobalt is reversible and the retention capacity increases with decreasing concentration. Samples formed at low loading show strong evidence of structural incorporation relative to those formed at high loading. In particular, the sample with 0.004wt% Co needs a 20% dissolution of goethite before 64% of its incorporated cobalt is released while samples with 1.74wt% Co requires a dissolution of 7.8% of goethite before liberating 66% of adsorbed cobalt. All the grades of Co-goethite dissolves incongruently with iron, however, the mode of formation should be considered when determining the leaching conditions for maximum recovery. In addition, the mixed Co-goethite grades show strong deviation from congruent dissolution and have a negative effect on the amount of cobalt and iron released during extraction. ]]>
机译：<！[cdata [ 抽象 在解吸和解散期间Geethite中的合并钴的行为是我们对最大的最佳提取技术的理解基础钴恢复。在此，研究了老化合成共霉淀粉的表面络合建模，解吸和溶解，证明了在玉米薄膜中具有不同量的钴的表面络合，表面沉淀和结构掺入之间的过渡。鹅料钴吸附的表面络合建模揭示了两种表面络合和多核配合物的存在。表面络合在低表面负载下开始（≥ 0.004 WT％CO）以形成Fe（OH） 2 CO，以及吸收（0.03至0.2 WT％CO）增加，两个表面复合物，FE（OH） 2 CO和（＆ FEOH） 2 CO，形成。浓度的额外增加（0.45至1.7 wt％）导致聚核复合物的形成（例如，（＆ meoh） 3 CO 2 ）与其他复合物共存。如果CO吸附是不可逆转的，则结构掺入将表现出来。我们发现，在四周的吸附后约55％至70％的钴是可逆的，并且保留容量随着浓度的降低而增加。在低负载下形成的样品显示相对于在高负载下形成的那些的结构掺入的强烈证据。特别地，具有0.004 wt％Co的样品需要20％的聚乙烯溶解，在其掺入的64％的钴之前释放，而样品为1.74 Wt％Co需要溶解7.8％的甲磺酸盐，然后释放66％的吸附钴。所有等级的共蛾用铁溶解，然而，当确定最大恢复时，应考虑形成模式。此外，混合的共同植物等级显示出强烈溶解的强烈偏差，对提取过程中释放的钴和铁的量产生负面影响。 ]]>

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