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 ...
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 ...
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 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 …
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.
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 ...
Efforts are now being made to develop improved flotation technology for the efficient processing of low grade bauxite ores. Such resources are classified according …
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 …
This document will critically review existing and potential processes for the processing of high silica bauxites. High silica bauxites are usually considered to be those with reactive silica contents in excess of ∼ 8% by weight of the bauxite (reactive silica is …
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. As the economic reserves of high grade ores diminish, attention is turning to how these lower grade ores may be processed at reasonable cost. …
A high sulfur content is one of the challenges in the processing of refractory bauxites in China. The high carbon content of bauxite makes it more difficult to deal with. Desulfurization and decarbonization are the critical issues in the efficient exploitation of high-sulfur bauxite resources. An experimental study on the removal of sulfur and …
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.
Citation: Li Zhenyu. Study on the Flotation Desulfurization of High-sulfur Bauxite in Northwest[J]. Multipurpose Utilization of Mineral Resources, 2020, (6): 127-130. doi: 10.3969/j.issn.1000-6532.2020.06.021
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].
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 ...
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.
2. Flotation separation can be used to separate diaspore and kaolinite, using oxidized paraffin soap and tar oil as collectors in alkaline medium. The bauxite flotation concentrate grade contains 49.65% alumina, and the recovery rate is 45.3%. For the desiliconization process of high-silica bauxite, flotation is more effective.
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 …
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.
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, …
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 ... has a high content of alumina followed by high silica content. This type of bauxite is not optimally used because it cannot be used as feed ...
Besides the high alumina content, the bauxite from the north region contains mostly kaolinite as the silica mineral, while the deposits from the central-south ... The strategy is based on the insoluble silica flotation followed by magnetic separation and results in a concentrate containing 54% available alumina and at a recovery of 81.2%. In ...
This paper reports an innovative development: concentrating gibbsite via reverse froth flotation in order to obtain a metallurgical-grade bauxite concentrate. …
It is known that high grade bauxite, with an Al 2 O 3 to SiO 2 mass ratio greater than 10, can be processed directly by the Bayer process (Papanastassiou et al., ... Progress in flotation de-silica. Transactions of Nonferrous Metals Society of China, 13 (3) (2003), pp. 656-662. Google Scholar. Hu et al., 2002.
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 ...
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 time influence on the flotation indicates that the presence of slime can significantly affect the gibbsite concentration. Keywords: Bauxite; Gibbsite; Direct flotation; Hydroxamate.
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.
silica dissolved from bauxite during digestion, contributing to DSP formation. Soda demand for processing high-silica bauxites can amount to 20% of the cost of alumina production. The Al 2 O 3 /SiO 2 mass ratio in bauxite ore holds economic significance. High-grade bauxite ore with an Al 2 O 3 /SiO 2 ratio
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 …
silica ratio) of bauxite has fallen to below 5 in some Chinese refineries. ... in red mud could be reduced when Flotation is followed by the Bayer process. ... use the high iron bauxite comprehensively and to realize the maximum economic benefits. 5 References 1. Gui-min Luo, Jinq-ing Sun, Study on the ore washing process of karst deposit ...
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 ...
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
DOI: 10.1016/J.MINENG.2017.09.009 Corpus ID: 103558055; A review of pretreatment of diasporic bauxite ores by flotation separation @article{Gibson2017ARO, title={A review of pretreatment of diasporic bauxite ores by flotation separation}, author={Borbor A.K.K. Gibson and Darius G. Wonyen and Saeed Chehreh Chelgani}, journal={Minerals …
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 3 content, 61.4%. ... The processing of high silica bauxites—Review of existing and potential processes.
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 …
A substantial amount of bauxite tailings (BTs) at abandoned mine sites have been stored in waste reservoirs for long periods, leading to significant land occupation and environmental degradation. Although many studies of the resource utilization of BTs were conducted to address this challenge, there is still a lack of efforts to systematically …
