Dealkalization processes of bauxite residue: A comprehensive review

Appropriate human intervention stimulates the development of microbial communities and soil formation at a long-term weathered bauxite residue disposal area.

Nitrogen removal from wastewater with high ammonia nitrogen comcentration via shorter nitrification and denitrification

Neutralization of red mud using bio-acid generated by hydrothermal carbonization of waste biomass for potential soil application

Insights into variations on dissolved organic matter of bauxite residue during soil-formation processes following 2-year column simulation.

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.

Industrial wastes applications for alkalinity regulation in bauxite residue: A comprehensive review

Integrating column leaching experiments and geochemical modelling to predict the long-term alkaline stability during erosion process for gypsum amended bauxite residue.

Hartley William

Papers

Industrial wastes applications for alkalinity regulation in bauxite residue: A comprehensive review

Integrating column leaching experiments and geochemical modelling to predict the long-term alkaline stability during erosion process for gypsum amended bauxite residue.

Conversion of alkaline characteristics of bauxite residue by mechanical activated pretreatment: Implications for its dealkalization.