— The lithium-rich bauxite flotation tailings are obtained from the Sanmenxia bauxite in Henan Province. The chemical composition of the lithium-rich bauxite flotation tailing samples is presented in Table 1. As seen in Table 1, the Li 2 O content was 0.59%, and the main impurities were Al 2 O 3 and SiO 2. Sodium bicarbonate (AR purity) was ...
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— 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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— 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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— diasporic bauxite with Al to Si recovery ratio of 10 and alumina recovery of 86%. Recent research by the authors reported that reverse flotation can be applied to …
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— 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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It can be seen from Table 1 that the content of alumina and silica were 55.75 and 24.21%, respectively. The A/S ratio of the low-grade bauxite sample was about 2.30, and it was a typical low-grade bauxite with high alumina, high silica, and low A/S ratio.
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— Cationic reverse flotation of kaolinite from bauxite is an alternative to adequate high silica bauxites to the specifications of the Bayer process. However, the presence of clay minerals influences the slurries rheology decreasing the flotation performance. The objective of this work was to investigate the use of ultrasonic pre …
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— Section snippets Characterization of bauxite. 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).
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High-silica bauxite Flotation Desiliconization Introduction By 2015, the discovered bauxite reserves of China has reached to 4.71 billion tons according to the statistics [1, 2], mainly distributed in Shanxi, Guangxi, Guizhou and Henan Province [3]. However, most of bauxites are characterized
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— 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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— Reverse flotation has been applied to process high silica bauxite in order to increase the bauxite quality, particularly for Chinese diaspore [4]. ... Figure 4 shows the XRD pattern of (a) concentrate and (b) tailings of batch reverse flotation of washed bauxite tailings. Overall, both of concentrate and tailings contain similar minerals ...
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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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— 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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— 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…
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— By reverse flotation of the ore, a high-grade bauxite concentrate with A/S ratio 8.54 was obtained, however the Al2O3 recovery remained low at 42.87%. ... It was deduced that the separation of ...
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— 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 …
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— These fine particles are believed to have high content of silica which is detrimental to the process. ... to recover alumina content from washed bauxite tailing. The reverse flotation experiments ...
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High silica bauxites are usually considered to be those with reactive silica contents 1 in excess of ~8% by weight of the bauxite. "Economic processing" is meant to imply production of alumina ...
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— 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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— World reserves of bauxite include vast quantities of ore which at present are sub-economic due to high levels of reactive silica that cause expensive loss of caustic soda during Bayer processing.
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Closed-Circuit Desilication Test of Gravity Separation and Flotation for Bauxite According to the spiral chute roughing and concentration tests, the following closed-circuit process was used and shown in Figure 2, the results are shown in Table 3. Figure 2. The flow chart of gravity separation and flotation for bauxite ore. Table 3.
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— 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.
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silica from the bauxite, or some other form of pre-treatment that effectively renders the silica unreactive during the subsequent Bayer digestion. 2. Modify the process to produce a …
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— The effect of pH value on bauxite flotation was studied and the results are shown in Fig. 7. It can be seen from Fig. 7 that increasing the pH value from 7.5 to 11 improves the recovery of the concentrate greatly and the A/S first increases and then decreases. ... The processing of high silica bauxitesâ€"Review of existing and potential ...
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— 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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2 Experimental 2.1 Raw materials The high-silica bauxite sample used in this study had been described in our previous study, which has a high Al 2 O 3 content of 62.92%, a high SiO 2 content of 16.72%, a low A/S of 3.76, and a mineral composition dominated by diaspore (63.4%) and kaolinite (31.2%). 37 The particle size distribution of the high-silica …
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— However, oleic acid collectors are still widely used in bauxite flotation as the most commonly used collectors (Deng et al., 2015;Wang et al., 2017) due to their low cost, high collection capacity ...
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High Silica Bauxite Processing High silica bauxites - detailed process review, ... flotation process and removed from the rest of the ore. Unfortunately this liberation does
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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 … Expand. Save. Improved Flotation of Oolitic Hematite Ore Based on a Novel Cationic Collector.
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Keywords: bauxite, silica, reverse flotation, ratio of alumina to silica ... widely used in mineral processing because of its high selectivity and large processing capacity 4. Based on the
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