Flotation is particularly suitable for diasporic ores with a ... For this study, four low-grade, high-silica-containing bauxite samples were collected from different bauxite mines in Odisha. A petrographic study was carried out to understand the mineral composition of bauxite. The texture of the ore was
— This paper is one of a study that implements reverse flotation methods as an alternative beneficiation on bauxite processing. This study is aimed at decrease silica content and increase alumina content in bauxite so its qualified as feed of Bayer Process. The experiments were carried out in a 1375 mL of flotation cell tank.
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
High Silica Bauxite Processing High silica bauxites - detailed process review, ... flotation process and removed from the rest of the ore. Unfortunately this liberation does
— 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 ...
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 followed by two-step leaching with water and sulfuric …
— The reverse-flotation process cannot achieve effective separation of Al 2 O 3 and SiO 2 from high-ferrous bauxite [13] because high-ferrous bauxite is characterized by a high content of Al 2 O 3 ...
— 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.
— 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].
— 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 ...
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.
— 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 ...
Flotation could be used to remove quartz from lateritic bauxites, but in this case the fraction of the reactive silica removed compared to the cost of the treatment
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
— 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 ...
been on the average of 25% when treated by grinding and desliming but these high grade reserves are being depleted. The utilization of marginal quality bauxite ores has been ... Ore characterization indicates that gibbsite is the major aluminum mineral while kaolinite is the predominant silica gangue mineral. Bench flotation tests using ...
— Unlike bauxite ores found in other countries, more than 99% of the bauxite ores in China are diasporic-characterized by tough processing demands, high alumina and silica content, and low alumina to silica mass ratios (hereafter referred to as A/S). In 2003 China's bauxite mineral reserves stood at 2.545 Gt (Luo, 2006). Among these ores ...
— 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).
— The objective of this study is to characterize low-grade Seydişehir bauxite ore using chemical and mineralogical techniques, and to investigate its flotation …
Thermal activation of bauxite has been proposed to enable removal of organic carbon and reducing boehmite digestion temperature. However, there is limited published research about how thermally activated bauxite behaves at pre-desilication (<100 °C) conditions. Combining x-ray diffraction and scanning electron microscopy energy dispersive …
— 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 …
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 …
— 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 ...
— 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…
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 cannot ...
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 …
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.
— 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 ...
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 size of -74 …
— 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 …
— 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 …
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 …
— 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.
— 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 ...
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 …
— 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.
