Improving bio-desilication of a high silica bauxite by two …
The high silica bauxite was obtained from Shanxi Aluminum of Hejin, Shanxi province (China). The bauxite was crushed in a disc vibration grinder (RS 200; Retsch, Germany), sieved to isolate the 75- to 150-μm mineral powders, and cleaned based on the method of Sheng et al. (2008). ... Through flotation tests and mineral surface analysis, …
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Effect of Thermal Activation Temperature on Pre-desilication …
Compared with 650 and 700 °C, the pre-desilication results of low-grade bauxite after thermal activation at 600 °C had a significant improvement. Only after 30 min of leaching, the ratio of alumina to silica of low-grade bauxite can be increased from 2.39 to 6.78. This study may have a certain significance for selecting a suitable thermal ...
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Suspension calcination and alkali leaching of low-grade …
Silica is the most harmful impurity in alumina produc-tion; it increases the loss of both alkali and alumina. If the silica content in bauxite increases 10 kg per ton, 6.6 kg more sodium hydroxide will be consumed and 8.5 kg more alu-mina will be lost [7]. The desilication of high-silica bauxite
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Reverse flotation for removal of silicates from diasporic-bauxite
The diasporic-bauxite in China is characterized by a high content of Al 2 O 3 and SiO 2 and a low ratio of Al 2 O 3 to SiO 2 (m ... The diasporic-bauxite ores used in the flotation tests were supplied from Zhengzhou Henan China, and crushed to 0–3 mm by a jaw crusher and double-roller. In the X-ray powder diffraction analysis, it was found ...
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Advances in Beneficiation of Low-Grade Bauxite | SpringerLink
Aluminum industries use bauxite as the major raw material . Bauxite containing less than 50% Al 2 O 3 is called low-grade bauxite ore, which is generally used for the production of aluminum appliances such as abrasives, ceramics, and refractories . The presence of impurities, including silica, iron oxides, and calcium contribute to the …
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Investigation of Flotation Behaviors of Refractory High-Silica Bauxite …
Request PDF | Investigation of Flotation Behaviors of Refractory High-Silica Bauxite | High content of silica results in high soda consumption, which limits the use of high-silica bauxite in the ...
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Synchronous Desulfurization and Desilication of Low …
and High-Sulfur Bauxite by a Flotation Process Wencui Chai, Guihong Han, Yanfang Huang, Yijun Cao, and Jiongtian Liu Abstract The existence of sulfur and silica in bauxite influence the product quality of Bayer alumina. The synchronous desulfurization and desilication of low-grade and high-sulfur bauxite through reverse flotation processes
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Separation of silica from bauxite via froth flotation
Separation of silica from bauxite via froth flotation @article{Massola2009SeparationOS, title={Separation of silica from bauxite via froth flotation}, author={Camila Peres Massola and Arthur Pinto Chaves and J.R.F. de Lima and Christian Fonseca de Andrade}, journal={Minerals Engineering}, year={2009}, …
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Flotation techniques for separation of diaspore from bauxite …
In this work,the main flotation parameters of high silica bauxite (A/S 5.0) including particle size, pulp pH, collector dosage and dispersant dosage were studied. With an optimal condition of 33% ...
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Synchronous Desulfurization and Desilication of Low-Grade and High
The existence of sulfur and silica in bauxite influence the product quality of Bayer alumina. The synchronous desulfurization and desilication of low-grade and high-sulfur bauxite through reverse flotation processes were studied using modified starch as depressants in this work. The effects of depressant dosage, modified depressant dosage and collector …
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Effect of Thermal Activation on Phase Transformation and …
Alumina industry is an important portion of the national economy. However, with the gradual decrease of high-grade bauxite and the increasing demand for aluminum resources, the efficient and comprehensive utilization of low-grade bauxite became more important [1, 2].Due to the low mass ratio of alumina-silica (A/S), low-grade bauxite was …
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Light Metals 2016 | SpringerLink
Investigation of Flotation Behaviors of Refractory High-Silica Bauxite. Guihong Han, Lulu Liu, Yanfang Huang, Shuzhen Yang, Dianyuan Dang; Pages 11-14. Download chapter PDF Study on effective extraction of Al and Fe from high-iron bauxite through "calcification-carbonization" method. Zhang Weiguang, Zhang Ting'an, Lv Guozhi, Zhang Xuhua ...
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Research on the Desulfurization of High Sulfur Bauxite
Effects of particle size of the high-sulfur bauxite, flotation agent dosage, pulp pH main flotation parameters on the sulfur removal rate were mainly discussed. And the optimum conditions can be obtained. ... And the mass ratio of alumina (Al 2 O 3) to silica (SiO 2) (A/S) is 4.41. Especially, the total sulfur content is high to 5.61%.
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The processing of high silica bauxites
This paper reports a study that implements reverse flotation method to separate silica from West Kalimantan bauxite ores. The study is aimed to find the good …
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A study of bauxite tailing quality improvement by reverse flotation
Reverse flotation has been applied to process high silica bauxite in order to increase the bauxite qual ity, particularly fo r Chinese diaspore [4]. Xia et al [5] used Gemini cationic surfactant ...
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Investigation of Flotation Behaviors of Refractory High-Silica Bauxite …
High content of silica results in high soda consumption, which limits the use of high-silica bauxite in the production of Bayer alumina. In this work,the main flotation parameters of high silica bauxite (A/S 5.0) including particle size, pulp pH, collector dosage and dispersant dosage were studied. With an optimal condition of 33% solid density, particle …
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Removal of silicates from gibbsite-bauxite ore by using …
The results of XRF of flotation products show that increasing of alumina content and decreasing of silica content. The optimum pH range of bauxite flotation using DDA and AERO 3000C as collectors can be achieved at pH 4 – 10. From the results, flotation performance using DDA is better than AERO 3000C because get higher Al 2 O …
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Resource-Saving Technology for Nepheline Concentrate …
Abstract The article describes the lab-scale tests aimed at development of an efficient technology for nepheline concentrate production from high-silica nepheline-bearing raw material to be a non-bauxite import-substituting feedstock for the aluminum industry in Russia and in the other countries with limited or totally unavailable high-quality bauxite …
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Reverse flotation for removal of silicates from diasporic-bauxite
DA is one of the most used collectors in the reverse froth flotation of silicates from bauxite (Liu et al., 2015) and is also suitable for the reverse cationic flotation of high silica iron ore ...
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Alkali Methods for Alumina Extraction from the By-products of High …
More than 90% of bauxite resource in China is diasporic bauxite with the characteristics of a high alumina content (Al 2 O 3 >55%) and a low A/S (mass ratio of alumina to silica) of 5.0–8.0 . As the best quality ore has consumed, more than 70% of bauxite resource in China is characterized with middle-low grade (A/S<7) now in many …
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Flotation of low-grade bauxite using organosilicon cationic …
The processing of high silica bauxites—Review of existing and potential processes [J] Hydrometallurgy (2009) Hong ZHONG et al. Flotation separation of diaspore from kaolinite, pyrophylite and illite using three cationic collector [J] ... During bauxite flotation, flotation indexes decrease with increasing water circulation time, resulting in ...
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Mechanochemical Activation of Bauxite | SpringerLink
Separation of silica from bauxite via froth flotation. Minerals Enginnering, (2009), v. 22, n° 04, p. 315–318,. Google Scholar P. Smith. The processing of high silica bauxites — Review of existing and potential processes. ... Mechanochemical treatment of high silica bauxite with lime. Minerals Engineering, vol. 15, p.211–214, 2000 ...
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Research progress on desulfurization technology of high-sulfur bauxite
Flotation experimental study on desulfurization of a high-sulfur bauxite in Chongqing [J]. China Mining Magazine, 2017, 26: 315âˆ'319. (in Chinese) [63] YANG Guo-bin, ZHANG Zhou-wei, CHEN Li-rong. Desulfurization and desiliconization experiment by flotation on a high sulfur and high silica bauxite ore from Guizhou province [J].
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Leaching Kinetics of Thermally-Activated, High Silica Bauxite
Currently, bauxites with a high amount of reactive silica (about >8 %) and an A/S ratio of less than 6 are currently considered to be uneconomic to treat with the conventional Bayer process . Many approaches have been proposed to upgrade bauxites, for example by screening, flotation, magnetic separation and thermo-chemical methods …
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Separation of silica from bauxite via froth flotation
Separation of silica from bauxite via froth flotation. March 2009. Minerals Engineering 22 (4):315-318. DOI: 10.1016/j.mineng.2008.09.001. Authors: C.P. Massola. …
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Extraction of alumina and silica from high-silica …
In this paper, a novel process is proposed to extract Al 2 O 3 and SiO 2 from high-silica bauxite without residue discharge, that is, sintering bauxite with Na 2 CO 3 …
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Characterization and flotation of low-grade boehmitic bauxite …
Bauxite is the main raw material in primary aluminum production and its reactive silica content and mass ratio of Al 2 O 3 to SiO 2 (A/S) has a critical role in the economic viability of Bayer process. As a major source of the reactive silica, clay impurities should be removed from the ore as much as possible by a beneficiation method such as …
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Characterization and flotation of low-grade boehmitic bauxite …
Brinci and Gok [48] also upgraded the low-grade boehmitic bauxite by removing silica via floatation, resulting in a high-grade bauxite concentrate with an A/S ratio of 8.54. A Bauxite A/S ratio of ...
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Separation of silica from bauxite via froth flotation
This paper reports an innovative development: concentrating gibbsite via reverse froth flotation in order to obtain a metallurgical-grade bauxite concentrate. Tailings from an industrial plant have undergone attrition scrubbing and desliming; the quartz …
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Bauxite Beneficiation and Processing | Dry …
However, a high-grade bauxite contains up to 60% Al2O3, and many operating bauxite deposits are well below this, occasionally as low as 30-40% Al2O3. Because the desired product is a high purity Al2O3, the …
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