Development of alkaline electrochemical characteristics demonstrates soil formation in bauxite residue undergoing natural rehabilitation
Development of alkaline electrochemical characteristics demonstrates soil formation in bauxite residue undergoing natural rehabilitation
复制标题
碱性电化学特性的发展表明经过自然修复的铝土矿残渣中土壤的形成
DOI：
10.1002/ldr.2836
复制
发表时间：
2018-01
影响因子：
4.7
通讯作者：
Chuxuan Li
中科院分区：
文献类型：
--
作者：
Xiangfeng Kong;Tao Tian;Shengguo Xue;William Hartley;Longbin Huang;Chuan Wu;Chuxuan Li
采矿和矿物加工业产生了大量的多矿物废物，造成广泛地理位置的大片景观遭到破坏和退化。这些矿山废弃物景观的恢复对于氧化铝精炼厂等采矿和冶金业务的社会和经济可持续性至关重要。拜耳法提炼氧化铝的过程会产生大量的高碱性铝土矿残渣，对植物生长有害。迫切需要创新的方法来应对这一经济和环境挑战，其中之一是铝土矿残留物的土壤形成。矿物风化是铝土矿废渣场土壤形成和功能性发育的前提条件。本研究调查了自然变化的矿物学，zeta电位，等电点，表面质子化，活性碱性基团，以及相关的影响铝土矿渣处理区的恢复。碱性方解石，水石榴子石，方钠石矿物慢慢转化或溶解，随着风化时间的推移，水平下降。无定形和半无定形矿物也相应减少比表面积和吸附位点。新鲜残渣的Zeta电位曲线比老化残渣的Zeta电位曲线斜率大。新鲜残渣的等电点显著高于陈化残渣，陈化残渣的等电点显著低于陈化残渣，且随着陈化时间的延长，等电点显著降低。这些属性在矿物学和电化学特性，如碱性矿物的转化，表面质子化和活性碱性基团的减少，可以用来帮助评估土壤的形成状态在不同年龄的铝土矿残渣和相关的修复要求。
Mining and mineral processing industries have generated a large amount of polymineral wastes, causing the destruction and degradation of huge areas of landscapes at extensive geographical locations. Rehabilitation of these mine waste landscapes is critical to social and economic sustainability of mining and metallurgy operations, such as alumina refineries. The Bayer process to refine alumina generates large amounts of highly alkaline bauxite residues that are hazardous to plant growth. Innovative methodologies are urgently needed to address this economic and environmental challenges, one of which is soil formation from bauxite residues. Mineral weathering appears the prerequisite to the initiation of soil formation and development of functional soil properties in bauxite residue disposal areas. The present study investigated natural changes of mineralogy, zeta potential, isoelectric point, surface protonation, active alkaline groups, and associated implications for rehabilitation of the bauxite residue disposal area. Alkaline calcite, hydrogarnet, and sodalite minerals were slowly transformed or dissolved with declining levels over weathering time. Amorphous and semiamorphous minerals also decreased with a corresponding decrease in specific surface area and sorption sites. Zeta potential curve of fresh residue had steeper slope than those of aged residues. The isoelectric point of fresh residue was significantly higher, but those of aged residues were significantly lower, with a significant decrease of isoelectric point with increasing time. These attributes in mineralogy and electrochemical characteristics such as transformation of alkaline minerals, and decreases of surface protonation and active alkaline groups, may be used to help the assessment of soil formation status in the bauxite residues of different age and associated rehabilitation requirements.
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影响因子：
--
作者：
J. Wong;G. Ho
通讯作者：
J. Wong;G. Ho
影响因子：
4.7
作者：
D. Smart;S. Callery;R. Courtney
通讯作者：
D. Smart;S. Callery;R. Courtney
影响因子：
5.8
作者：
D. Higgins;T. Curtin;R. Courtney
通讯作者：
D. Higgins;T. Curtin;R. Courtney
DOI：
10.1038/sj.bdj.2010.84
发表时间：
2020-04
期刊：
BDJ
影响因子：
--
作者：
R. G. Alexander
通讯作者：
R. G. Alexander
铝土矿残渣自然风化过程后土壤成因的新预测因子
影响因子：
5.8
作者：
Feng Zhu;Shengguo Xue;William Hartley;Ling Huang;Chuan Wu;Xiaofei Li
通讯作者：
Xiaofei Li