The adsorption behavior of Pb2+ and Cd2+ ions on bauxite flotation tailings was investigated to demonstrate the adsorptivity of the bauxite flotation tailings. The adsorption percentage of Pb2+ and Cd2+ ions as a function of adsorbent dosage, solution pH value and shaking time were determined by batch experiments. The maximum …
This paper was to investigate the effect of particle size on diasporic-bauxite flotation. For this purpose, concentrate products of various size fractions were collected at different flotation times and forwarded to the testing of Al 2 O 3 and SiO 2 contents. Six flotation kinetic models were applied in the fitting of the experimental data in terms of Al …
Bauxite is the major alumina (Al 2 O 3 ) bearing ore used in the aluminum manufacturing industries. The bauxite containing less than 50% Al 2 O 3 is called low-grade bauxite ore which is commonly used for the alumina -based abrasives and refractories productions. The alumina -silica and alumina -ferrite complexes are the …
This book is the definitive reference in the field of aluminum production and related light metal technologies. ... Synchronous Desulfurization and Desilication of Low-Grade and High-Sulfur Bauxite by a Flotation Process. Wencui Chai, Guihong Han, Yanfang Huang, Yijun Cao, Jiongtian Liu; ... Alumina and Bauxite 2. Aluminum Alloys, Processing ...
Reverse flotation is one of the most effective methods to realize the desulfurization and desilication of low-quality bauxite [1, 2]. Reverse flotation of low-grade bauxite has been studied widely using quaternary ammonium salt as the collector of aluminosilicate minerals [3, 4].
When these parameters were optimized, the aluminum concentrate assaying 67.41% Al 2 O 3 with 66.84% recovery and 7.44 A/S ratio was obtained from the bauxite ore assaying 42.94% Al 2 O 3 with 2.48 A/S ratio. It was concluded that hydrochloric acid leaching proved an effective method for upgrading of flotation concentrate from a low-grade ...
During bauxite flotation, flotation indexes decrease with increasing water circulation time, resulting in the discharge of bauxite flotation wastewater as well as a …
The flotation properties of single minerals such as diaspore, kaolinite and pyrophllite in bauxites were investigated using RL as collector. The effects of regulators and unavoidable ions on flotation were studied. Based on the results of single minerals flotation, the separation experiments of mixed minerals and bauxite ore were carried out. The results …
An important result of recent bauxite flotation research was the opening in 2002 of the first bauxite mineral processing plant in China (and in the world) which uses direct flotation to prepare a bauxite concentrate for the Bayer process (Zhao et al., 2010). One million tons/yr of bauxite ore can be treated at this plant.
In book: Light Metals 2018 (pp.203-207) ... The results demonstrated that the classical first-order model was the most reasonable model to fit the diasporic-bauxite flotation process throughout ...
Request PDF | On Jan 1, 2019, Wencui Chai and others published Synchronous Desulfurization and Desilication of Low-Grade and High-Sulfur Bauxite by a Flotation Process | Find, read and cite all ...
Further studies of bauxite ore flotation were also conducted, and the reverse flotation separation process was adopted. The concentrates with the mass ratio of Al 2 O 3 to SiO 2 of 9.58 and Al 2 O 3 recovery of 83.34% are obtained from natural bauxite ore with the mass ratio of Al 2 O 3 to SiO 2 of 6.1 at pH value of 11 using the organosilicon ...
Bio-related techniques have been proved to be efficient and specific in eliminating impure minerals such as goethite, hematite and kaolinite from aluminum hydroxides in bauxite processing. In this study, the bacterium Paenibacillus polymyxa (P. polymyxa) mediated dissolution and flotation of bauxite were experimentally investigated. To disclose the …
The reverse flotation separation of kaolinite and diaspore has been achieved by using the collector dodecylamine (DDA) and depressant cationic polyacrylamide (CPAM) at pH 5.5–8.5. The flotation results have been explained by adsorption measurement, solution chemistry and density functional theory (DFT) …
Reverse flotation is one of the most effective methods to realize the desulfurization and desilication of low-quality bauxite [1, 2]. Reverse flotation of low …
The flotation desulfurization process is simpler, less investment and higher utilization of resources. Therefore, flotation process is more suitable for high-sulfur bauxite desulfurization . In this study, the high-sulfur bauxite was used as raw materials and the flotation was applied to separating sulfur minerals from bauxite.
The bauxite Fe O content was reduced from 7.66%. to 4.81-5.03%. In addition, the flotation performance decreased by diminishing the pH from 9.5 to 8.5 or increasing. the pH to 10.5. The milling ...
The bauxite flotation plants in China, most of which were built and put into production after 2009, retained good flotation indexes by discharging the backwater out of the recycling system and replacing it with fresh water. There are no reports on research and industrial applications of backwater treatment of bauxite flotation.
Closed-circuit flotation tests showed that reverse flotation de-silicating can be achieved by a new reagent scheme (DTAL, SFL and MIBC) to obtain a bauxite …
Bauxite Mineralogy. H. R. Hose. Search for more papers by this author. H. R. Hose. Search for more papers by this author. Book Editor(s): Don Donaldson. Search …
The Effects of Iron Ions in Backwater on Diaspore and Kaolinite Flotation. Figure 2 presents the flotation recoveries of diaspore and kaolinite under different …
To ensure that an appropriate production index is maintained, freshwater is added during bauxite flotation after the recycled water is discharged, and bauxite flotation wastewater is generated. Bauxite flotation wastewater is generally weakly alkaline (the pH is approximately 9.0) and mainly contains suspended solids, soluble …
Journals & Books; Search; ... 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. According to Fig. 7, the optimum flotation pH value is 11.
Zhang et al. [13] utilized a plate-packed flotation column (PFC) for fine bauxite, and the Al 2 O 3 recovery and grade increased by 2.11% and 1.85%, respectively, compared to the result obtained ...
During bauxite flotation, flotation indexes decrease with increasing water circulation time, resulting in the discharge of bauxite flotation wastewater as well as a waste of resources and great environmental safety risks. To determine how to return the wastewater back to the flotation process, this study aimed to identify the main …
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, …
3. Iron-rich bauxite processing and metallurgy. Iron-rich bauxite ore usually contains over 40 wt% iron oxide [11, 12], huge reserves are found in Australia, Guinea, Brazil, Laos, Vietnam and China, but they have not yet been used effectively.It is worth noting that more than 1.5 billion tons of iron-rich bauxite resources have been explored …
The desulfurization of high-sulfur bauxite via flotation is more difficult than conventional sulphide, since the finely disseminated sulphide in the high-sulfur bauxite …
The effect of Al3+ in backwater on the flotation of diaspore bauxite was investigated by micro-flotation tests and the underlying mechanisms were investigated by inductively coupled plasma (ICP) measurement, zeta potential measurements, solution chemistry analyses, and synchrotron near edge X-ray absorption fine structure …
The extent of Al 2 O 3 recovery from the concentrate represented how many useful resources could be recovered, and the mass ratio of Al 2 O 3 to SiO 2 (A/S) in the …
The optimum pH range of bauxite flotation using DDA as collectors can be achieved at pH 4 – 10. ... Nappier-Munn, T., 2006. Wills' Mineral Processing Technology. Queensland: Elsevier Science & Technology Books. Xiu, L., Zhong, H., Liu, G., & Wang, S. (2009): Utilization of soluble starch as a depressant for the reverse flotation of diaspore ...
2.2. Flotation tests. Single mineral flotation tests with diaspore and kaolinite were conducted in a 40 mL flotation cell, each using 3 g of mineral samples in 40 mL of distilled water.After the desired amount of reagents (pH controller or collector) was added, the pulp was agitated for 3 min.Since the pH of suspension was adjusted and the …
