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 ...

The flotation−Bayer process is the most widely used method for physical pre-desilication, but is generates more tailings simultaneously (25% of the initial bauxite ores in mass fraction) [17]. ...

1. Introduction. In China, bauxite reserves are general diaspore resources with Al 2 O 3 /SiO 2 mass ratio ranging from 4 to 6 (Deng et al., 2016).To prepare for the feed of Bayer process (normally Al 2 O 3 /SiO 2 mass ratio is more than 8), flotation is an effective physical separation method commonly used to remove part of aluminosilicate …

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 …

Bauxite ore can be extracted from ore washing, flotation, magnetic separation, and chemical and physical methods to extract metal aluminum. Among them, flotation is a more commonly used method in bauxite beneficiation process in recent years. Ore washing is a simple and effective method to increase the aluminum-silicon …

Treatment technique for wastewater from bauxite flotation and an application for its reuse. December 2021. Journal of Cleaner Production 335 (5):130321. DOI: …

When corn starch was used as a depressant, flotation separation of the artificial mixed-mineral samples and the bauxite ore were conducted by using BDDA as a collector at pH around 9–10.

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 ...

Flotation. According to the difference in physicochemical properties of mineral particle surfaces, flotation is the method that selectively enriches the target minerals in the pulp at the gas-liquid interface and separates them from the pulp, thus realizing the mineral separation. It is also known as floating separation.

DOI: 10.1016/j.apsusc.2021.151964 Corpus ID: 244468639; Flotation enhancement of low-grade bauxite using oxalic acid as surface pretreatment agent @article{Li2021FlotationEO, title={Flotation enhancement of low-grade bauxite using oxalic acid as surface pretreatment agent}, author={Huaxia Li and Wencui Chai and Yijun Cao and Shichong …

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, …

Synchronous Desulfurization and Desilication of Low-Grade and High-Sulfur Bauxite by a Flotation Process. Wencui Chai, Guihong Han, Yanfang Huang, Yijun Cao, and …

This study proposed a green and effective lithium extraction process employing sodium bicarbonate solutions to leach lithium-rich bauxite flotation tailings. …

Bauxite Flotation Chaojun Fang 1, Ziyong Chang 2, Qiming Feng 1, Wei Xiao 1 ID, Shichao Yu 1, Guanzhou Qiu 1 ... The particles with the size of º 0.074 + 0.038 mm was used for flotation tests,

This study can be used to guide the application of backwater in the flotation of diaspore bauxite in industry. C 1s NEXAFS approximate energy ranges and primary absorption peaks [45].

X-ray fluorescence (XRF) analysis was used to determine the sample. chemical composition. Flotation was then accomplished by using hydroxamate as gibbsite collector, sodium silicate as. silicate ...

For low-grade bauxite the separation efficiency (Es) could be expressed as Es = % kaolinite recovery -% diaspore recovery. A larger Es reflected a better reverse flotation separation effect. The quaternary ammonium salts were used in the study, whose effects on the floatability of diaspore and kaonlinite at varied pH levels were given in Fig. 2.

The diasporic-bauxite ores used in the flotation tests were supplied from Zhengzhou Henan China, and crushed to 0–3 mm by a jaw crusher and double-roller. In the X-ray powder diffraction analysis, it was found that the composition of minerals in sample I were diaspore (53.4–53.8%), pyrophyllite (14.7–17.4%), illite (16.5–15.8% ...

Flotation of micro-fine minerals particle, particularly the application of NPCs in high-sulfur bauxite flotation is a new research direction. Therefore, in the study, St (Styrene) and BA (Butyl Acrylate) were chosen as the host monomers and NPCs were synthesized by emulsion polymerization. The characteristics of high-sulfur bauxite, …

Flotation experiments showed that packing-plates in the collection zone of a column can improve bauxite flotation performance and increase the smaller bauxite particles recovery. Using packing ...

Packing the medium in the collection zone of a column can improve bauxite flotation performance and enhance the separation of aluminum minerals from silicon …

The desulfurization of high-sulfur bauxite via flotation is more difficult than conventional sulphide, since the finely disseminated sulphide in the high-sulfur bauxite can lead to excessive particle entrainment, increase of froth, and low separation efficiency. ... The acidified high-sulfur bauxite used in this work was from different …

The Al/Si mass ratio of bauxite for feeding the Bayer process has to be more than 8. The Al/Si in diaspore is less than 6 and has to pretreat before feeding to the process. Flotation has been typically used to increase the mass ratio of Al/Si diaspore ores. This study reviewed how different flotation factors can effect on upgrading diaspore.

Key words: backwater treatment; bauxite flotation; polyaluminum ferric chloride; Box-Behnken design 1 Introduction Ore grade decreases because of the sharp and increasing demand of bauxite [1]. More than 98% of the bauxite ores in China are of the diasporic type, having characteristics of complex mineral composition, low A/S (mass …

For low grade diasporic bauxite with an Al 2 O 3 to SiO 2 mass ratio below 8, a sintering process (Jiang et al., 2002) or a combination of sintering and Bayer process (Chen and Peng, 1997) can be used. The sintering process is extremely energy-intensive and environmentally unfriendly, incurring a high alumina production cost.

In this investigation, the fine-grained bauxite ore flotation was conducted in a plate-packed flotation column. This paper evaluated the effects of packing-plates on recovering fine bauxite particles and …

The XRF result shows that the A/S of the bauxite sample is 3.36, and the content of sulfur is 2.87%. These results indicate that the ore used in this work belongs to low grade and high-sulfur diaspore bauxite. The XRD result indicates that the main valuable mineral is diaspore, the major sulfur and silicon minerals in the bauxite samples are ...

During bauxite flotation, flotation indexes decrease with increasing water circulation time, resulting in the discharge of bauxite flotation wastewater as well as a …

Abstract. During bauxite flotation, flotation indexes decrease with increasing water circulation time, resulting in the discharge of bauxite flotation …

Abstract: Bauxite is the main raw material for the alumina industry. Direct flotation is the most widely used method for bauxite beneficiation. In this study, a large number of direct flotation tests were carried out using several anionic reagents. The testing concluded that vegetable oil acid (VOA), naphthenic acid

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 …

The flotation−Bayer process is the most widely used method for physical pre-desilication, but is generates more tailings simultaneously (25% of the initial bauxite ores in mass fraction) [17]. ...

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.

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 …

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.

In reverse flotation system of diasporic bauxite with DAH as collector, high-dose SHMP is often used as depressant for diaspore. Although these hydrophilic SHMP molecules will cover all the Al active sites on kaolinite surface, there are still many Si sites exposed to flotation slurry to adsorb DAH collector molecules to make the kaolinite ...

Bauxite is the main raw material for the alumina industry. Direct flotation is the most widely used method for bauxite beneficiation. In this study, a large number of direct flotation tests were carried out using several anionic reagents. The testing concluded that vegetable oil acid (VOA), naphthenic acid (NA) and lauryl polyoxyethylene …

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 …