Separation of diaspore from bauxite by selective flocculation using hydrolyzed polyacrylamide. Wenli Liu Yue-hua Hu Wei Sun. Materials Science, Environmental Science. 2014. Selective flocculation is a new method to solve the problem of China's bauxite de-silication besides flotation and reverse flotation. The method of selective flocculation ...

Low-grade bauxite resources are abundant in China. However, the high content of silica can not meet the production requirments of alumina. Desiliconization experiments were carried out during the process of one roughing-one cleaning direct flotation in this work using diasporic high-silica bauxite as experimental ore samples, …

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 …

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 ...

Keywords: High-silica bauxite; Flotation; Al 2O 3 recovery; A/S Abstract 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

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 …

1. Introduction. Bauxite is the main source of aluminum metal, and one of its typical types is diasporic bauxite, of which the valuable mineral is diaspore and the main associated gangues are aluminosilicate minerals such as kaolinite, illite, and pyrophyllite [1].Diasporic bauxite is often of poor quality (the content ratio of alumina and silica is too …

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 ...

Various methods have been applied for bauxite desilication, including flotation desilication,3 biologic desilication,4,5 and desilication by roasting.6 Among these methods, roasting-alkali leaching desilication at atmospheric pressure1,2,7,8, – 9 is the most effective and widely used, because of its advantages of high silica removal ratio …

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% ...

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 …

The flotation-Bayer process has been widely applied in the alumina refineries, but it introduces large amounts of hazardous organic reagents and produces tailings totaling of about 25% of the initial bauxite ores in weight. 25,26 The lime Bayer process has been also employed to process a portion of high-silica bauxite, but it …

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 …

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

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 …

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.

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}, …

Investigation of Flotation Behaviors of Refractory High-Silica Bauxite. January 2016. Authors: Guihong Han. Zhengzhou University. Lulu Liu. Yanfang Huang. …

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 …

Request PDF | Investigation of Flotation Behaviors of Refractory High- Silica Bauxite: TMS/Light | High content of silica results in high soda consumption, which limits the use of high-silica ...

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

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 ...

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.

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 ...

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 …

Desiliconization experiments were carried out during the process of one roughing-one cleaning direct flotation in this work using diasporic high-silica bauxite as experimental …

The bauxite from Pará-Brazil is a mixture of minerals where gibbsite (Al(OH)3), kaolinite (Al4[Si4O 10](OH)8), quartz, hematite, goethite, rutile and octahedrite are the most important minerals.

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 …

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 …

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 …

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 ...

The high-silicon bauxite used in the experiment was from Guangxi province, China. The chemical compositions and minerals of the bauxite are shown in Table 1 and Fig. 1 respectively, and the corresponding mineral contents are listed in Table 2.In the high-silicon bauxite, the total content of Al 2 O 3 and SiO 2 is more than 58 %, and the main …

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].

: There are abundant diasporic bauxite resource in China. The gravity separation and flotation process are utilized for treating this kind of ore. When the ore grinding fineness is -200 mesh 80%, the qualified bauxite concentrate can be obtained, and it contains Al 2 O 3 71.62%, SiO 2 8.94%, and its Al 2 O 3 recovery rate is 75.43%, A/S …

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 ...

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 …

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 …