bauxite residue dioxide

The objective of this study was to investigate the mechanisms and extent of bauxite residue (red mud) neutralization at the residue surface in field impoundments as a result of long-term reaction with atmospheric CO 2 and addition of amendments to promote vegetation. The results showed that carbonation from atmospheric carbon dioxide …

reduces the pH to 9 by consuming OH-in bauxite residue (Xue et al. 2016a; Han et al. 2017; Higgins et al. 2018). The chemical and mineralogical properties of the com-bined bauxite residue are significantly different from those of the Bayer process bauxite residue. The combined bauxite residue has a lower content of Fe and a higher

Bauxite residue is a mixture of several simple and complex oxides that are originated either from bauxite ore itself or from Bayer process as a by-product. Bauxite residue generally contains a large fraction of hematite and other iron-bearing minerals like goethite. These minerals give the characteristic red color to bauxite residue hence the ...

Bauxite residue is the industrial solid waste discharged from the production of alumina by bauxite, which contains a certain amount of ferric oxide in a reddish-brown color, so it is also called "red mud", and is a typical non-ferrous metallurgical solid waste (Wang et al. 2018; Xue et al. 2022).The varieties of bauxite residue depend on the …

Bauxite residue (red mud), an alkaline slurry from alumina refining, is produced in large volumes and disposed of in large surface impoundments. The objectives of this study were to measure the extent of neutralization of bauxite residue by carbon dioxide as a function of C O2 partial pressure and to determine the geochemical reactions responsible for …

The process reduces bauxite residue by a remarkable 30% by eliminating iron values while simultaneously recovering a higher alumina yield, reducing the total organic content from bauxite during the alumina refining. ... REEs, and titanium dioxide. Vedanta Aluminium, a business of Vedanta Limited, is India's largest producer of …

This study investigates the neutralization of bauxite residue following the application of biomass as an alkali modifier by natural fermentation. Fresh bauxite residue samples were collected from Pingguo refinery (Aluminum Corporation of China). ... Fu J, Lowry GV (2010) Field evaluation of bauxite residue neutralization by carbon dioxide ...

Bauxite residue was exposed to carbon dioxide (C O 2) at partial pressures ranging from 10 − 3.5 to 1 atm and the residue pore-water pH was …

The two-step processing of bauxite residue via neutralisation and subsequent leaching establishes the effect of CO 2 gas as neutralisation reagent on the extraction efficiencies of metal recovery via acidic leaching. The minimum pH …

Bauxite residue (red mud) is a promising anthropogenic source of scandium because only at the aluminum plants of Ural region (Russia) nearly 150 tons of this trace metal appears in the waste dumps annually. This work describes a method of red mud carbonization by carbon dioxide that results on the one hand to scandium leaching and …

DOI: 10.1016/J.MINENG.2017.07.011 Corpus ID: 103231244; Neutralisation of bauxite residue by carbon dioxide prior to acidic leaching for metal recovery @article{Rivera2017NeutralisationOB, title={Neutralisation of bauxite residue by carbon dioxide prior to acidic leaching for metal recovery}, author={Rodolfo M. Rivera and …

BAUXITE RESIDUE. Bauxite residue is a waste product from the aluminium production process. Rich in iron and aluminium, bauxite residue is produced through the extraction …

Bauxite residue (Red mud) is produced in alumina plants by the Bayer process in which Al-containing minerals are dissolved in hot NaOH. The global residue inventory reached an estimated 3.5 billion tons in 2014, increasing by approximately 120 million tons per annum. The appropriate management of bauxite residue is becoming a …

Bauxite 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 – …

A key driver in achieving the goal is finding reuse opportunities for bauxite residue, which consists primarily of red mud and coarse sand. Alcoa is a founding member of the four-year ReActiv project, which is seeking to transform bauxite residue into a reactive material suitable for new cement products that have a low carbon dioxide …

The abstraction of alumina [Al 2 O 3] through the Bayer process is an economic way compared to other processes using bauxite residue, which may result in a relatively small proportion of alumina (Evans, 2016; Rai et al., 2020).The bauxite is crumpled, grinded and then assorted with caustic soda solution and impelled in claves …

The large amount of bauxite residue (red mud) -a highly alkaline by-product of the Bayer process of refining bauxite into aluminahas a relevant environmental impact and poses a challenge to the aluminum industry. In particular, the high alkalinity (pH~13) of red mud can cause adverse environmental consequences if no treatment is applied before final …

Bauxite residue was exposed to carbon dioxide (C O 2) at partial pressures ranging from 10 − 3.5 to 1 atm and the residue pore-water pH was measured until a steady state pH was achieved. Using pure C O 2 ( P C O 2 = 1 atm ), a steady state pH of 7.7 was established in 1 day while it took 9 days to reach a pH of 9.8 at P C O 2 = 10 − 3.5 atm .

Bauxite residue (BR) is generated as a by-product of the Bayer process. Approximately 1.2 tons of BR is generated per ton of alumina production but the quantity of bauxite residue depends upon on the quality of the processed bauxite ore and the processing parameter (Primary Aluminium Production).The annual generation of BR in …

Simultaneous carbon mineralization during neutralization of bauxite residue, a caustic alkaline by-product of alumina refining, was tested using laboratory batch and a field pilot study in contact with atmospheric CO 2.Since CO 2 sequestration is limited by the Ca concentration in the bauxite residue, extra Ca sources were added in a semi-soluble …

The results showed that carbonation from atmospheric carbon dioxide reduces the pH of red mud from 12.5 to about pH 9.3 at the surface of storage cells, …

Depending on the composition of the original bauxite, as well as the method and conditions of processing, 1 tonne of alumina produces 0.8–1.2 tonnes of bauxite residue. The global alumina production is estimated to be 150 million tonnes per year and, thus, generates an estimated 150 million tons of bauxite residue — of which less than …

The objective of this study was to investigate the mechanisms and extent of bauxite residue (red mud) neutralization at the residue surface in field impoundments as a result of long-term reaction with atmospheric CO2 and addition of amendments to promote vegetation. The results showed that carbonation from atmospheric carbon dioxide …

Bauxite residue produced from alumina refineries is a significant environmental risk for the surrounding environment including soil, vegetation and aquatic life, if not properly managed. ... waste carbon dioxide from ammonia production has been adopted in Kwinana (Australia) and accelerated carbonation using intensive farming methods (Aughinish ...

b. Production of bauxite residue The amount of bauxite residue produced by an alumina plant or refinery is primarily dependent on the sources of the bauxite and secondarily on the extraction conditions used by the plant. In the extreme, this can vary from 0.3 to as high as 2.5 tonnes of residue per tonne of alumina produced, though typically

Neutralisation of bauxite residue by carbon dioxide prior to acidic leaching for metal recovery. October 2017. Minerals Engineering 112:92-102. DOI: …

Red mud, also referred to as bauxite residue, is the largest process waste produced during alumina production from bauxite ore by the Bayer method. Approximately 1–2 tons of red mud are produced ...

About 0.7–2 tons of bauxite residue is generated for each ton of alumina produced 11, and the annual global production of bauxite residue is about 140 million tons 12, while 2.7 × 10 9 tons ...