Study on quantitative structure–activity relationship of quaternary

Thus, bauxite reverse flotation process still has a long way to go before it can be put into commercial use, to which the design and development of high-selectivity collectors for aluminosilicate gangue minerals (mainly kaolinite) are very critical (Chen et …

Synchronous Desulfurization and Desilication of Low …

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

The role of cationic polyacrylamide in the reverse flotation …

Both direct flotation [6,7] and reverse flotation processes [3, 8, 9] have been developed for bauxite flotation. For direct flotation, diaspore can be floated with sodium oleate as collector at ...

A review of pretreatment of diasporic bauxite ores by flotation …

Therefore, diasporic bauxite ores (Al/Si < 6) have to be upgraded by pretreatment methods to meet the required quality for the Bayer process. Flotation separation (direct or reverse) followed by ...

Recent advances in reverse flotation of diasporic ores––A …

Over the last three years significant progress has been made in developing a viable reverse flotation technology to upgrade the Chinese diasporic bauxite to an alumina to silica mass ratio greater than 10, so that they can be used as feed to the well-known Bayer process. This review article summarizes the progress in fundamental …

Significance of particle aggregation in the reverse …

of the reverse flotation of low grade bauxite, efforts which include the development of new collectors as well as fundamental studies on the reverse flotation of kaolinite (Hu et al., 2001 ...

Effect of modified starches on depression of diaspore

Key words: starch; diaspore; reverse flotation; depressant 1 Introduction Cationic reverse flotation desilication is a key process for the effective utilization of Chinese diasporic bauxite in terms of the improvement of aluminum/silicon ratio (A/S), by which the gangue minerals, such as kaolinite, illite and pyrophyllite, are purposely ...

Effect of hydroxamic acid polymers on reverse flotation of bauxite …

The effect of hydroxamic acid starch (HAS) and hydroxamic acid polyacrylamide (HPAM) on the flotation of diaspore and kaolinite was investigated by flotation test. It is found that HAS depresses diaspore but activates kaolinite in acidic pulp, while HPAM activates both diaspore and kaolinite in the pH range of 2.0–10.5. The measurement of zeta potential …

Flotation Decarbonization and Desulfurization of a High-Sulfur Bauxite

In this study, butyl xanthate and terpenic oil were applied in the reverse flotation for the simultaneous decarbonization and desulfurization of high-sulfur bauxite. After the batch flotation and open-circuit flotation tests, it was found that the products meet the requirements of the Bayer method for industrial application.

Application of air-sparged hydrocyclone in reverse flotation …

In order to resolve the problem of fine particle flotation in the reverse flotation of bauxite, a new type of air-sparged hydrocyclone was designed, through …

(PDF) Studi Konsentrasi Pada Bauksit Asal Tayan Dengan …

This paper is one of a study that implements reverse flotation methods as an alternative beneficiation on bauxite processing. This study is aimed to increase alumina content in bauxite so its qualified as feed of Bayer Process (Al2O3> 51%, SiO2 10 ratio).

Significance of particle aggregation in the reverse …

The reverse flotation of kaolinite from bauxite ore at low pH with dodecylamine hydrochloride collector has been reported. However, resolving the mechanism of the reverse flotation process is ...

Mechanism of reverse flotation desilication for bauxite by …

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 concentrate (A/S > 10, Al2O3 recovery ...

A review of pretreatment of diasporic bauxite ores by flotation …

Diaspore pretreatment separation may be accomplished by direct or reverse flotation (Sheng-gui et al., 2007, Sanjun et al., 2013). The purpose of this study is to provide a comprehensive review of various conditions which affect the upgrading of diaspore by froth flotation as a pretreatment process. It will discuss how different …

A study of bauxite tailing quality improvement by reverse flotation

The reverse. flotation experiments were carried out at pH of 6 and 8; while the particle sizes were varied at -. 140+270 mesh and -270 mesh, using a batch and circuit configuration. The result of ...

A Theoretical Study of the Effect of Carboxyl Hydroxamic …

Liu, G. Zhong, H. Hu, Y. Zhao, S. and Xia, L., 2007 The role of cationic polyacrylamide in the reverse flotation of diasporic bauxite Minerals Engineering 20 1191 – 1199. CrossRef Google Scholar Lu, Y.P. Zhang, G.F. Feng, Q.M. and O, L.M., 2002 A novel collector RL for flotation of bauxite Journal of Central South University of ...

Advances in Beneficiation of Low-Grade Bauxite | SpringerLink

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 …

Synthesis and characterization of a novel collector for the

Fine high-sulfur bauxite flotation desulfurization is a great challenge presently. This study aims to synthesize nanoparticle collectors (NPCs) by emulsion polymerization to improve the abovesaid ...

Separation of silica from bauxite via froth flotation

By reverse flotation of the ore, a high-grade bauxite concentrate with A/S ratio 8.54 was obtained, however the Al 2 O 3 recovery remained low at 42.87%. Although the A/S rate achieved by the flotation was adequate for the Bayer process, Al 2 O 3 recovery was considered to be low for flotation process. It was deduced that the …

Reverse flotation for removal of silicates from diasporic-bauxite

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 ...

Study on quantitative structure–activity

Study on quantitative structure–activity relationship of quaternary ammonium salt collectors for bauxite reverse flotation @article{Hu2012StudyOQ, title={Study on quantitative structure–activity relationship of quaternary ammonium salt collectors for bauxite reverse flotation}, author={Yue-hua Hu and Pan Chen and Wei Sun}, journal={Minerals ...

Flotation of Low-Grade Bauxite Using Modified Humics as …

Flotation of low-grade bauxite is an effective way to improve the grade. Flotation experiments were carried out by using modified humics as depressant in this paper. The effects of pulp pH, collector dosage and depressant dosage were examined. Under the optimal flotation conditions with sodium oleate dosage of 2200 g/t, modified …

Separation of silica from bauxite via froth flotation

The role of cationic polyacrylamide in the reverse flotation of diasporic bauxite. Guangyi Liu Hong Zhong Yue-hua Hu Shenggui Zhao L. Xia. Materials Science, Chemistry. 2007; 69. Save. Related Papers. Showing 1 through 3 of 0 Related Papers. 43 Citations; 4 References; Related Papers;

Reverse flotation for removal of silicates from diasporic …

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 …

Advances in Beneficiation of Low-Grade Bauxite | SpringerLink

Anionic collectors are considered to be best for direct flotation and cationic collectors are used in reverse flotation technique [17, 23, 24]. Different types of depressant (sodium silicate, starch) are used in the flotation method to depress the silicate and iron impurities present in bauxite [ 22 ].

Study on quantitative structure–activity relationship of quaternary

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 concentrate (A/S > 10, Al2O3 recovery ...

Evaluation of quaternary phosphonium salt as the collector in bauxite

Therefore in present study, 1231, a common quaternary ammonium salt for bauxite reverse flotation, was screened for the comparison. Besides, only the classic system of bauxite reverse flotation was discussed in present study. More experiments are needed to further confirm the superiority of quaternary phosphonium salt for other …

Study on quantitative structure–activity relationship of amine

However, the design and selection of coal slurry flotation collectors lack theoretical guidance. In this paper, the quantitative structure–activity relationship (QSAR) model between the molecular structure descriptors of collectors and the flotation recovery and selectivity index is established by using pure kaolinite/clean coal flotation ...

Application of air-sparged hydrocyclone in reverse flotation of bauxite

Based on the characteristics of China's bauxite and cyclone separation, the cyclone-reverse flotation technique was experimentally carried out for the separation of low-grade bauxite, of which the ...

Solution chemistry of flotation separation of diasporic bauxite

The technological schemes of direct or reverse flotation separation of aluminum silicate minerals from bauxite were suggested. The fundamentals involved the technologies were studied. The relationship of collectors, dispersant and pH can be determined by solution chemical calculation in the direct flotation of bauxite by anionic collectors.

Recent advances in reverse flotation of diasporic ores––A …

The reverse flotation was able to upgrade the Chinese diasporic bauxite ores to an alumina to silica mass ratio of greater than 10 at an alumina recovery greater than 85%. It is hoped that this knowledge may lead to applications in other areas where gangue clay minerals are a problem such as potash, phosphate, iron ores and low rank …

Synchronous Desulfurization and Desilication of Low …

Reverse flotation of low-grade bauxite has been studied widely using quaternary ammonium salt as the collector of aluminosilicate minerals [3, 4]. To obtain a better desilication, sodium hexmetaphosphate or starch are usually added in the flotation system to depress diaspore [5, 6]. Among the currently available depressants, starch …

A review of pretreatment of diasporic bauxite ores by flotation …

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 ...

Flotation of low-grade bauxite using organosilicon cationic …

Further studies of bauxite ore flotation were also conducted, and the reverse flotation separation process was adopted. The concentrates with the mass ratio of Al2O3 to SiO2 of 9.58 and Al2O3 recovery of 83.34% are obtained from natural bauxite ore with the mass ratio of Al2O3 to SiO2 of 6.1 at pH value of 11 using the organosilicon cationic ...

Separation of silica from bauxite via froth flotation

This paper reports an innovative development: concentrating gibbsite via reverse froth flotation in order to obtain a metallurgical-grade bauxite concentrate. Tailings from an industrial plant have undergone attrition scrubbing and desliming; the quartz …

Effect of hydroxamic acid polymers on reverse flotation …

Abstract. The ffect ofhydroxamic acid starch (HAS) and hydroxamie acid polyacrylamide (HPAM) on the flota-tion f diaspore and kaolinite wasinvestigated by flotation test. Itis found that HAS depresses diaspore but acti-vates kaolinite inacidic pulp,while HPAM activates both diaspore andkaolinite the pH range of 2.0 -10. 5.