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 …

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 …

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 …

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

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 ...

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 …

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 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% ...

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 …

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.

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 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 …

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 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 ...

The process to refine metallurgical bauxite into alumina involves the following inputs: Bauxite ore. Caustic soda – sodium hydroxide chemical (NaOH) Energy (refining process requires both heat and pressure) Fresh water. The following outputs are generated: Alumina (Al2O3) Alumina refinery residues (ARR) or Red mud.

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, …

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.

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].

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 …

The flotation of diasporic bauxite is to separate diaspore (valuable mineral) from aluminosilicate minerals (gangue minerals, mainly including kaolinite, illite and pyrophyllite), and the microscopic interaction force between the two types of minerals and air bubbles determines the separation efficiency.

Flotation is known as a highly versatile method and it is widely used for mineral processing, and direct flotation is reported effective for desilication of bauxite (Wang et al., 2004; Pan et al ...

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.

A bauxite sample obtained from Dengfeng Mine of Henan province of China was used in this investigation. The results of X-ray diffraction patterns (XRD) analysis and multi-element chemical composition (tested by X-ray fluorescence (XRF)) of the samples are shown in Fig. 1 and Table 1, respectively.Foremost valuable mineral in the sample is …

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 …

Flotation can be a solution to concentrate bauxite and favor the Bayer process with a more adequate feed. Flotation is a mineral concentration process that aims to selectively …

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 ...

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

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.