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Hartley William

Bio: Hartley William is an academic researcher from Harper Adams University. The author has contributed to research in topics: Bauxite & Leaching (agriculture). The author has an hindex of 2, co-authored 2 publications receiving 71 citations.

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Journal ArticleDOI
TL;DR: In this paper, the authors focus on the origin and transformation of alkalinity in bauxite residues using typical industrial waste and propose key research directions with an emphasis on alkaline regulation by industrial waste, whilst also providing a scientific reference point for their potential use as amendments to enhance soil formation and establish vegetation on Bauxite residue disposal areas.
Abstract: Bauxite residue is a highly alkaline material generated from the production of alumina in which bauxite is dissolved in caustic soda. Approximately 4.4 billion tons of bauxite residues are either stockpiled or landfilled, creating environmental risks either from the generation of dust or migration of filtrates. High alkalinity is the critical factor restricting complete utilization of bauxite residues, whilst the application of alkaline regulation agents is costly and difficult to apply widely. For now, current industrial wastes, such as waste acid, ammonia nitrogen wastewater, waste gypsum and biomass, have become major problems restricting the development of the social economy. Regulation of bauxite residues alkalinity by industrial waste was proposed to achieve ‘waste control by waste’ with good economic and ecological benefits. This review will focus on the origin and transformation of alkalinity in bauxite residues using typical industrial waste. It will propose key research directions with an emphasis on alkaline regulation by industrial waste, whilst also providing a scientific reference point for their potential use as amendments to enhance soil formation and establish vegetation on bauxite residue disposal areas (BRDAs) following large-scale disposal.

103 citations

Journal ArticleDOI
TL;DR: In this paper, the dissolution of alkaline solids in bauxite residue (BR) and gypsum amendment, as well as their environmental behaviors, were determined through a 1-year simulated rainfall leaching experiment.

6 citations

Journal ArticleDOI
TL;DR: In this paper , the effect of mechanical grinding pretreatment on the transformation mechanism of bauxite solids to free alkali at the BR interface under acids leaching was investigated by monitoring the morphology, phase, and speciation transformations of Al and Si using primarily cross-section scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS) elemental mapping, XRD, X-Ray photoelectron spectroscope (XPS).

5 citations


Cited by
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Journal ArticleDOI
TL;DR: This review focuses on several typical processes for the management of bauxite residue alkalinity in recent decades around the world and describes the Bayer process in detail, where emphasis is put on the formation of alkaline substances in bauxites residue and its release process in long-term storage.

74 citations

Journal ArticleDOI
TL;DR: The results enhance the understanding of soil formation in bauxite residue and reveal the potential benefit of human intervention in ecological reconstruction at disposal areas.

66 citations

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TL;DR: In this article, a novel process employing natural biomass without addition of chemicals was proposed for remediation of red mud Hydrothermal carbonization (HTC) of local fallen leaves was conducted to obtain solution containing bio-acids (SBA) and hydrochar.

47 citations

Journal ArticleDOI
TL;DR: In this paper, the vertical characteristics of DOM in bauxite residue treated by PV (the combined addition of 2% phosphogypsum and 4% vermicompost, w/w) and BS (6% including 4% bagasse and 2% bran) with 2-year column experiments were investigated.

41 citations