Reaction behavior and mechanism of anatase in digestion process …
It can be revealed that CaO·2TiO 2 ·H 2 O changes into more stable CaTiO 3 which is hard to dissolve in hydrochloric acid. 3.4 Reaction mechanism of anatase in high-pressure digestion process In order to explore the reaction laws and its mechanism of titanium-containing mineral during high-pressure digestion process of diasporic bauxite ...
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In the treatment of boehmitic bauxites to achieve high target ratios, ideally requires: 1) fine milled bauxite, 2) optimal bauxite charge, 3) short residence times in digestion, 4) rapid settling in …
(PDF) THERMODYNAMIC PROCESS MODELING AND …
Jajarm bauxite is of the diaspore-chamosite type and its alumina to silica mass ratio is lower than other diaspore ores. Diaspore bauxite digestion in comparison with other …
Process for settling red mud in the digestion of bauxite
The invention provides novel water-soluble copolymers useful as flocculating agents, especially in flocculating the red mud formed during the Bayer process for the production of alumina from bauxite. The copolymers comprise anionic monomer units e.g. acrylic acid units in a mole percentage of less than 50% and acrylamide type units some of which are methylolated.
Microwave digestion of gibbsite and bauxite in sodium …
Therefore, based on the above theoretical research, a process for digesting gibbsite-boehmite bauxite is proposed using high digestion temperature (250 °C), short digestion time (5 min) and large ...
sbm/sbm pre digestion in bauxite mineral processing.md at …
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Digestion behavior and removal of sulfur in high-sulfur bauxite …
DOI: 10.1016/j.mineng.2020.106237 Corpus ID: 213466800; Digestion behavior and removal of sulfur in high-sulfur bauxite during bayer process @article{Liu2020DigestionBA, title={Digestion behavior and removal of sulfur in high-sulfur bauxite during bayer process}, author={Zhanwei Liu and Hengwei Yan and Wenhui Ma and Keqiang Xie and Bao-qiang Xu and Licong Zheng}, …
Desulfuration of high sulfur bauxite by oxidation roasting
Roasting temperature, phase transformation, microcrystal, specific surface area of high-sulfur bauxite, and the mechanism of the reaction during the roasting process were analyzed. The digestion ...
Reaction behavior and mechanism of anatase in digestion process …
Request PDF | Reaction behavior and mechanism of anatase in digestion process of diasporic bauxite | Based on the study of influence of temperature, digestion time, amount of CaO added and ...
Kinetics analysis for aluminum dissolution of west …
there are three minerals type of bauxite such as gibbsite, boehmite and diaspore (Bardossy and Aleva, 1990). Indonesia's bauxite mostly contains gibbsite and it requires relatively low digestion temperature for dissolving the alumina. Digestion is the core of Bayer process, which determine the yield of alumina. There are two main reactions
Modelling and optimization of digestion efficiency of …
digestion on the Bauxite charge, and, consequently, the Bauxite digestion efficiency has been investigated [20]. Mathematical modeling has been used to predict bauxite digestion efficiency in the Bayer process using statistical data [21]. Although several studies have been carried out on the parameters affecting the Bayer
Section 4.8 Operational Report 1. The Bayer Process
The Bayer process is a continuous process which may be separated into four simple steps: hydrothermal digestion, where the bauxite is heated in hot caustic soda solutions to dissolve …
Pre-desilication and digestion of gibbsitic bauxite with …
The effect of lime on the pre-desilication and digestion of gibbsitic bauxite in synthetic sodium aluminate liquor at different temperatures was investigated. The bauxite is comprised of gibbsite, aluminogoethite, hematite, kaolin, quartz, and minor boehmite. Lime increases the desilication efficiency of the bauxite during the pre-desilication process by …
Modelling and simulation of a diaspore tubular digestion process
The Bayer process for the production of alumina consists of three main stages: bauxite digestion with sodium hydroxide solution at high temperatures and pressures, precipitation of crystalline ...
Modelling and optimization of digestion efficiency of …
Low-grade bauxites, when required, are used in the Bayer process by simple and inexpensive pre-processing to remove or reduce aluminosilicate mineral content [1, 2].
(PDF) Smelting-reduction of bauxite for sustainable alumina …
149 BAYER PROCESS Alumina is mainly produced from bauxite ore through the well-known Bayer process, a hydrometallurgical process invented by Carl Josef Bayer in 1888-1892. 1 In this process bauxite ore is the main raw material and it is digested together with lime addition by a solution of caustic soda (NaOH).
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consumption of raw materials for different bauxite is calculated, and the optimized digestion process is suggested considering suppressed the quartz attack and boehmite reversion. …
A Novel Self-Stirring Tubular Reactor Used in Bauxite Digestion Process
A new process of diasporic bauxite concentrate preparation associated with tube digestion is presented, that strides over the existing technology in terms of better bauxite usage, lower energy ...
Removal Behavior of Carbonate in Bauxite Digestion Process …
The results show that when the mass concentration of carbonate in sodium aluminate solution is 25g·L-1, the optimum digestion conditions of alumina and removal conditions of carbonate were lime addition of 11% and reaction temperature of 270℃, and the corresponding digestion rate of alumina and removal rate of carbonate were 72.47% and ...
Boehmitic Reversion in a Double Digestion Process on a Bauxite …
Boehmitic Reversion in a Double Digestion Process on a Bauxite Containing Trihydrate and Monohydrate. Jean-Michel Lamerant, Jean-Michel Lamerant. Aluminium Péchiney, Alumina Technology, PO Box 54 - 13541 Gardanne Cedex-France ... View the article/chapter PDF and any associated supplements and figures for a period of 48 hours. …
Enhanced conversion mechanism of Al-goethite in gibbsitic bauxite …
Trans. Nonferrous Met. Soc. China 32(2022) 3077âˆ'3087 Enhanced conversion mechanism of Al-goethite in gibbsitic bauxite under reductive Bayer digestion process Guo-tao ZHOU, Yi-lin WANG, Tian-gui QI, Qiu-sheng ZHOU, Gui-hua LIU, Zhi-hong PENG, Xiao-bin LI School of Metallurgy and Environment, Central South University, Changsha 410083, China …
Effect of alumogoethite in Bayer digestion process of high …
The transformation law of goethite and its effect on the alumina recovery were investigated in order to determine the reason of low alumina recovery in Bayer digestion process of gibbsitic bauxite with high alumogoethite content.The results show that the goethite present in this kind of bauxite has no obvious change in the digestion temperature range of 110 ℃ to 240 ℃ with …
Study on Bayer Process-Double-Fluid Digestion of Flotation Bauxite …
PDF; Cite; Share facebook twitter google linkedin ... 41-45. Next Article Previous Article. Study on Bayer Process-Double-Fluid Digestion of Flotation Bauxite Concentrate[J]. Conservation and Utilization of Mineral Resources, 2003, (1): 41-45. doi: 10.3969/j.issn.1001-0076.2003.01.012 ... Study on Bayer Process-Double-Fluid Digestion of ...
Evolution of Tube Digestion Technology for Alumina …
Alumina refineries use primarily the "Bayer" process to extract alumina from Gibbsitic, Boehmitic or Diasporic bauxites. The Bayer process utilises a recirculating stream of caustic soda to …
The Desulfurization and Digestion Property of High …
prepared by roasting desulfurization and Bayer digestion process. The process was divided into three steps: grinding treatment, roasting desulfurization, and digestion experi-ment. Each kind …
[PDF] Removal of sulfur by adding zinc during the digestion process …
DOI: 10.1038/s41598-017-17499-4 Corpus ID: 3276229; Removal of sulfur by adding zinc during the digestion process of high-sulfur bauxite @article{Liu2017RemovalOS, title={Removal of sulfur by adding zinc during the digestion process of high-sulfur bauxite}, author={Zhanwei Liu and Wenhui Ma and Hengwei Yan and Keqiang Xie and Dunyong Li and Licong Zheng and …
Effect of bauxite and digestion conditions on iron in SGA
In order to minimize the content of iron in the liquor (DBO), the digestion process was carried out with two bauxite samples with recycles of red mud, fine and coarse part (sand), at different ...
Effect of Lime Addition on the Predesilication and Digestion Properties
Request PDF | Effect of Lime Addition on the Predesilication and Digestion Properties of a Gibbsitic Bauxite | IntroductionExperimental proceduresResults and DiscussionsConclusion Acknowledgements ...
(PDF) Chemical Processing of Bauxite: Alumina and Silica …
This Chapter provides an introduction to the Bayer process and how the mineral composition of bauxites affects the process variants and the principal parameters to be …
THERMODYNAMIC PROCESS MODELING AND SIMULATION OF A DIASPORE BAUXITE
Mälardalen Mälardalen University University Press Press Licentiate Licentiate Theses Theses No. 170 No. 170 THERMODYNAMIC PROCESS MODELING AND SIMULA... Author: Alaina Green 51 downloads 0 Views 1MB Size