Investigating bauxite residue flocculation by hydroxamate and polyacrylate flocculants utilising the focussed beam reflectance measurement probe February 2009 International Journal of …
Get MoreIn total, five bauxite residues were investigated which originated from Greece, Germany, Hungary and Russia (North Ural & North Timan) using a …
Get MoreBauxite Residue is a caustic spinoff of the Bayer manner of bauxite refining to supply alumina. The predominant chemical elements of pink mud are Fe 2 O 3, Al 2 O 3, TiO 2, SiO 2, and Na 2 O. Iron oxide is the only which offers it a darkish red color that's why it's also known as crimson dust.
Get MoreThe bauxite residue is thickened to a high-density slurry using an advanced thickener, flocculation, and dewatering filtration technologies. The thickened red mud slurry is pumped via pipeline to the storage area and spread in layers, allowing it to de-water through a combination of drainage and evaporative drying.
Get MoreThe waste of coal mining results in numerous piles, which produce acid mine drainage (AMD) and deteriorate water quality. Also ions from the refuse piles, including sulfate, ferric and ferrous iron are continuously leached from these coal-refuse piles. Bauxite residue, a byproduct from alumina refining process, has a relatively high pH. If bauxite residue is innovatively mixed …
Get MoreRed mud (bauxite residue) is an industrial solid waste generated in alumina refining from bauxite (Liu et al., 2014) containing a variety of transition metal oxides (Yoon et al., 2020). Due to the high alkaline, red mud is highly corrosive and harmful to the environment (Ozden et al., 2018).
Get MoreBauxite residue is a waste by-product in the alumina refining business. The more colloquial term for it is 'red mud' since it contains high concentrations of iron oxides. About 30 million tons of this red residue currently reside in tailings ponds in Gramercy, Louisiana, the home of Noranda Alumina's 3,300-acre Alumina Refinery site.
Get More"Using bauxite residue as the raw material for construction products is one potential solution we are investigating for bauxite residue. Finding viable uses for this by-product is a challenge for our industry globally, but we aim to reduce and even eliminate the need to store new bauxite residue in the longer term."
Get MoreBauxite residue is a by-product of the Bayer Process. It is primarily composed of the insoluble fraction of the bauxite ore that remains after extraction of the aluminium-containing components. Iron oxides (10 – 30%), titanium dioxide (2 – 15%), silicon oxide (5 – 20%) and undissolved alumina (0 – 20%) make up the residue, together with ...
Get MoreFor example, alumina output is the input to the aluminium smelter while bauxite residue output is the input to the recyclers. Techniques such as â in-situâ leaching, solution mining and biotechnologies will be investigated to achieve the above and pilot plant investigations among partners will be conducted.
Get MoreBR06 - Investigating the Leaching, Desilication and Precipitation of Aluminium Tri-Hydroxides from a Bauxite Residue-Bauxite By-Product Slag James M. Mwase1 and Jafar Safarian2 . 1. Postdoctoral Researcher. 2. Associate Professor. Institute of Materials Science and Technology, Norwegian University of Science and Technology, Trondheim, Norway
Get MoreThe global average of bauxite residue generated per tonne of alumina is between 1 and 1.5 tonnes; it is estimated that over 150 million tonnes of bauxite residue are produced annually – 5-6 million tonnes in Europe alone, and the majority of this waste is being landfilled.
Get MoreA careful and dedicated investigation of bauxite residue by EPMA and HRTEM revealed that there are several types of discrete REE phases contained in bauxite residue. The most abundant of them is a LREE ferrotitanate (REE,Ca,Na)(Ti,Fe)O 3 ) phase, that chemically resembles the naturally occurring loparite except for the absence of niobium.
Get MoreOpportunities for using bauxite residue in Portland cement clinker production 2 International Aluminium Institute: ‐aluminium.org Current IAI membership represents over 60 % of global bauxite, alumina and aluminium production.
Get MoreBauxite residue is the solid residue generated in the Bayer process for aluminum production. About 0.7 2 tons ... a systematic investigation was performed using HNO 3, …
Get MoreReduction of the high alkalinity of bauxite residue is a key problem to solve to make it suitable for plant growth and comprehensive utilization. In this study, phosphogypsum, a waste product from the phosphate fertilizer industry, was used to drive the alkaline transformation of the bauxite residue. Under optimal water washing conditions ...
Get MoreIf bauxite residue is innovatively mixed with the coal refuse, the issues associated with these two wastes (e.g., high and low pH values) may be solved. Also, the concentrations of leached ions will be reduced significantly. This study investigates the impacts of bauxite residue + coal refuse on the environment
Get Morethis study presents the direct examination of the bauxite residue flocculation with polyacrylate and hydroxamate flocculants, using the focussed beam reflectance measurement (fbrm) probe to …
Get MoreStructural investigation relating to the cementitious activity of bauxite residue red med.Cement and Concrete Res., 41:847-853. ... Bauxite residue, a highly alkaline solid waste, is …
Get More12%Research conducted on determination of rare earth in bauxites and bauxite residues collected from Greece [ 21] has shown similarities to our results. Leaching characteristic of red mud under different pH values with TCLP-1311 method was investigated to evaluate the mobility of elements.
Get MoreUS-11028461-B2 chemical patent summary.
Get MoreInvestigation of Hydrological Behaviour of In Situ Bauxite Residue for Closure and Rehabilitation Design. ... At Worsley Alumina Refinery, the first Bauxite Residue Disposal Area (BRDA 1) was constructed in 1984. Residue deposition continued with the various stages of embankment raising. BRDA 1 reached the final design height in 1995.
Get MoreBauxite residue is a highly alkaline waste that is produced in the alumina manufacture. As of 2018, the global inventory of bauxite residue had reached 4.6 billion tons, and it is still growing at a rate of about 150–200 million tons annually (Tian et al. 2019; Xue et al. 2020; O'Connor and Courtney 2020; Ke et al. 2021).
Get MoreDespite the studies in the literature about scandium extraction from bauxite residue, there is a lack of investigation about suppressing the synthesis of silica gel in the acid reaction.
Get MoreBauxite is a reddish-brown clay-like deposit containing iron, silicates and aluminium oxides, the latter comprising the largest constituents. At present, bauxite is so plentiful that only deposits containing a content of aluminium oxides greater than 45% are selected to …
Get MoreRevegetation on bauxite residue disposal areas is the most promising strategy to reduce its potential ecological risk during stacking or disposing. Migration of salt ions in bauxite residue is one of the major issues to stimulate soil formation to support plant growth. 21 residue samples were collected and the related parameters including exchangeable cations, soluble …
Get MoreA bauxite residue/brine mixture of 90/10 by volume exhibited a CO2 sequestration capacity of greater than 9.5 g/L when exposed to pure CO2 at 20 °C and 0.689 MPa (100 psig). Dawsonite and calcite formation were predicted to be the dominant products of bauxite/brine mixture carbonation. It is demonstrated that CO2 sequestration is augmented by ...
Get MoreSources of imported bauxite from 2013 to 2016 were: 46% from Jamaica; 30% from Brazil; 21% from Guinea; 2% from Guyana; and 1% from others (Bray, 2018). Due to this foreign dependence, aluminum has been designated a critical element that requires investigation to determine feasible domestic resources.
Get MoreIn the present work, the cementitious behavior of Bauxite-Calcination-method red mud calcined within the interval 400–900 °C has been investigated.
Get MoreThe purpose of present work was to provide mineralogical insight into the rare earth element (REE) phases in bauxite residue to improve REE recovering technologies. Experimental work was performed by electron probe microanalysis with energy dispersive as well as wavelength dispersive spectroscopy and transmission electron microscopy. REEs are found as discrete …
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