Extracting silica and alumina from low-grade bauxite

Rayzman, Viktor L.; Aturin, Andrei V.; Pevzner, Ilya Z.; Sizyakov, V. M.; Ni, Leonid P.; Filipovich, Igor K.

doi:10.1007/s11837-003-0105-z

Cited by 26 publications

(4 citation statements)

References 1 publication

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“…The metal ions remaining in solution are then concentrated by solvent (water) evaporation before further treatment for the precipitation. When the mineral contains one major species, single MO particles are produced, but for more complex ore, composite materials can be obtained [35,36].…”

Section: Extraction From Oresmentioning

confidence: 99%

Nanocomposite and Nanofluids: Towards a Sustainable Carbon Capture, Utilization, and Storage

Nguele¹,

Nono²,

Sasaki³

2021

Advances in Microfluidics and Nanofluids

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Large volumes of unconventional fossil resource are untapped because of the capillary forces, which kept the oil stranded underground. Furthermore, with the increasing demand for sustainable energy and the rising attention geared towards environment protection, there is a vital need to develop materials that bridge the gap between the fossil and renewable resources effectively. An intensive attention has been given to nanomaterials, which from their native features could increase either the energy storage or improve the recovery of fossil energy. The present chapter, therefore, presents the recent advancements of nanotechnology towards the production of unconventional resources and renewable energy. The chapter focuses primarily on nanomaterials applications for both fossils and renewable energies. The chapter is not intended to be an exhaustive representation of nanomaterials, rather it aims at broadening the knowledge on functional nanomaterials for possible engineering applications.

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Section: Extraction From Oresmentioning

confidence: 99%

Nanocomposite and Nanofluids: Towards a Sustainable Carbon Capture, Utilization, and Storage

Nguele¹,

Nono²,

Sasaki³

2021

Advances in Microfluidics and Nanofluids

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“…Most of the researchers converted iron oxides to magnetite, which is a stable phase during water leaching and wet magnetic separation. The silica content in the leach solution can be decreased by adding MgO, CaO, and BaO during roasting or it can be removed by lime treatment of the leach solution [109]. Higher temperatures and increased residence times during sintering adversely affect the recovery of alumina due to complex phase formation.…”

Section: Aluminum Recovery From Bauxite Residue In View Of Iron Titamentioning

confidence: 99%

Recovery of Rare Earths and Other Valuable Metals From Bauxite Residue (Red Mud): A Review

Gerven

Blanpain

Pontikes

et al. 2016

J. Sustain. Metall.

262

140

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The long-term storage of bauxite residue (red mud) is harmful to the environment and the tailing ponds also cover large areas. At the moment there is no largescale utilization of bauxite residue. However, some bauxite residues contain considerable concentrations of rare-earth elements (REEs) and the recovery of these REEs together with(out) other metals and utilization of the generated residue in other applications (e.g., building materials) can solve the storage problem of bauxite residue. This paper reviews the recovery of REEs, possibly alongside other valuable metals, from bauxite residue. REEs can be recovered from bauxite residue by direct leaching or by smelting followed by leaching. The main disadvantages of direct acid leaching are the consumption of large amounts of acid for neutralization, the handling of large volumes of effluents, and the difficulty in using the bauxite residue after leaching. Recovery of iron prior to leaching can improve the economics of the process. However, high alumina in the bauxite residue increases the flux and acid consumption. Therefore, alumina needs to be removed by alkali roasting prior to smelting in order to decrease the flux and acid consumption. The alkali roasting-smeltingleaching process allows recovery of aluminum, iron, titanium, and REEs from bauxite residue. The residue generated in this process can be used in building materials and cementitious binders. Other processes with commercial potential are the Orbite, the pressure leaching, and the acid baking processes.

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“…In high silica bauxites, whose alumina minerals have a low liberation degree due to severe interlocking between the minerals, the thermo-chemical method has a considerable effect on the silica removal as a pre-treatment procedure [5]. This method has been tested by Saint Petersburg's VAMI Complex in a pilot scale [6]. The aim of bauxite heating is the formation of maximum amorphous silica, while formation of the mullite mineral is kept at its minimum value.…”

Section: Introductionmentioning

confidence: 99%

Improving Characterization of Low Grade Diasporic Bauxite to Be Utilize in Jajarm Alumina Plant

Shadloo¹,

Zarbayani²,

Jorjani

et al. 2013

Light Metals 2013

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Low grade diasporic bauxite in the Jajarm mine with an A/S (Al 2 O 3 /SiO 2 ) ratio of 2.3 is not usable in the Bayer process at Jajarm Alumina Complex. Due to the severe interlocking effect between the diaspore and aluminosilicate minerals (Chamosite and Kaolinite) and iron-containing minerals in a microcrystal matrix, the thermo-chemical treatment, which is independent from micro-mineralogy, was chosen for bauxite desilication. Five parameters affecting the process and their interactions were investigated using the Taguchi experimental design method. The results obtained showed that there was an interaction between the furnace temperature and the leaching time. Moreover, the optimum values for the parameters involved in the thermo-chemical treatment were determined to be a furnace temperature of 950 °C, a furnace residence time of 90 min, a leaching agent (soda) concentration of 150 g L -1 , and a leaching time of 120 min, where the solid content (in leaching) had no effect. Moreover, a model was proposed using the Dx7 software to predict the A/S ratio. The ratio was predicted to be 7.52 at the optimum conditions, whereas in the experiments carried out under the same conditions, it was obtained to be 6.96 ± 0.2, which means a 59% decrease in silica and an increase in the A/S ratio of up to 3 times with 80% weight recovery.

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Extracting silica and alumina from low-grade bauxite

Cited by 26 publications

References 1 publication

Nanocomposite and Nanofluids: Towards a Sustainable Carbon Capture, Utilization, and Storage

Nanocomposite and Nanofluids: Towards a Sustainable Carbon Capture, Utilization, and Storage

Recovery of Rare Earths and Other Valuable Metals From Bauxite Residue (Red Mud): A Review

Improving Characterization of Low Grade Diasporic Bauxite to Be Utilize in Jajarm Alumina Plant

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