Furthermore, some evidence indicates that double ring chelating compound is formed by chemical adsorption between the three oxygen atoms in COBA and the aluminium atom on the surface of diaspore. Thus, COBA may become a new type of selective collector for obverse flotation to remove Al Si minerals from bauxite.

Conclusions. In this paper, the influence of backwater Al. 3+. on the flotation of diaspore bauxite was studied. and the underlying mechanisms were investigated. It was found that backwater Al ...

There are 4.71 billion tons of bauxite ores reserves in China until 2015 [], and the majority is diaspore bauxite, which has a low ratio of alumina to silica (A/S).Diaspore bauxite was unsuitable for direct extraction of alumina with Bayer process and the Bayer-mineral processing method was developed to be a new approach to make better use of …

Bauxite flotation, an important part of the Bayer process with dressing, can improve the utilization rate of medium- and low-grade bauxite resources and contribute greatly to the sustainable development of the alumina industry. A large amount of water is needed for bauxite flotation, and most of this water can be recycled by adding a …

Enhanced Bauxite Recovery Using a Flotation Column Packed with Multilayers of Medium. Authors: Pengyu Zhang. Wencai Zhang. ia Tech (ia …

The results of XRF of flotation products show that increasing of alumina content and decreasing of silica content. 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 …

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 of bauxite using hydrolyzed polyacrylamide as flocculant was experimented and evaluated. The results of diaspore and kaolinite single mineral settling tests show that …

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 revealed the fundamental mechanisms. Bubble coalescence and break-up behaviors in the packed and unpacked flotation columns …

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, …

Bauxite flotation. Diaspore. Kaolinite. Collector adsorption. Active site. 1. Introduction.

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 collectors of aluminum minerals include fatty acids and sulfonates, and the adjusters include sodium hexametaphosphate, tannin, sodium pyrophosphate, soda ...

The objective of this study is to characterize low-grade Seydişehir bauxite ore using chemical and mineralogical techniques, and to investigate its flotation …

The major type of bauxite in China is low-grade diasporic bauxite, which is mainly composed of diaspore and kaolinite. Separation of silicate minerals by flotation technology can meet the requirements of Bayer process, but Na +, K + and Cl − deriving from mineral dissolution and entrainment in flotation water will inevitably mix in the …

Discharging waste water from the bauxite desilication process will bring potential environmental risk from the residual ions and organic compounds, especially hydrolyzed polyacrylamide. Characterization of the microbial community diversity in waste water plays an important role in the biological treatment of waste water. In this study, …

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 ...

Column flotation tests were performed on the bauxite ore to evaluate the impact of the packing medium on flotation performance. As shown in Table 3, without packing, 50.57% of Al 2 O 3 was

ABSTRACT. Effective desulfurization of high-sulfur bauxite is one of the major problems in the alumina production industry. To overcome this, a novel nanoparticle collector (NC) to improve the desulfurization performance during flotation process was synthesized via emulsion polymerization method, whereby lignin (natural polymer) was used as the host …

The collector for separating diasporic bauxite serves as a type of flotation reagent by adsorbing selectively on diaspore to make it hydrophobic enough to separate it from the aluminosilicates. Although the flotation process is considered economical in the desilication of Chinese diasporic bauxite, the existing collectors fail to separate these …

In this study, the bauxite ore for batch flotation test and diaspore and kaolinite samples for micro flotation test were obtained from Dengfeng, Henan Province, China. The valuable mineral and primary gangue mineral of bauxite ore are diaspore and kaolinite, respectively. Table 1 shows the chemical composition of this bauxite sample.

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 molecular structure of cationic surfactants is closely related to their flotation performance. In this paper, three cationic surfactants with different head group structures were selected as collectors of kaolinite, and the substituent effects were studied by the DFT method. The DFT calculation results showed that increasing the number of …

The open-circuit flotation results also show that a bauxite concentrate with m(Al2O3)/m(SiO2) over 9.3 and Al2O3 recovery over 76% can be obtained from diasporic-bauxite ore. The result of XRD of ...

eBook ISBN 978-3-319-48251-4 Published: 20 December 2016. Series ISSN 2367-1181. Series E-ISSN 2367-1696. Edition Number 1. Number of Pages XXVI, 1053. Topics Metallic Materials, Materials Engineering, Light Construction, Steel …

Abstract. 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. Acidification of high-sulfur bauxite resulting in changes in mineral ...

Results showed that when roasting at 650 °C for 120 s, the desulfurization efficiency was up to 76.98%, while the residual sulfur in the roasted ore was found to be 0.07%. HU et al [24] roasted high-sulfur bauxite ore at 600 °C for 60 min, and the dissolution test was performed at 240 °C and roasted for 60 min.

Column flotation tests were performed on the bauxite ore to evaluate the impact of the packing medium on flotation performance. As shown in Table 3, without packing, 50.57% of Al 2 O 3 was recovered …

Abstract. The low-grade bauxite, which is abundant in China, cannot be directly used in Bayer process. 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 …

The results show that the mass ratio of aluminum to silicate achieves 15.02 and the recovery of alumina in concentrate is 43.07% using 1627 as a collector. The 1627 is found to be a more effective and a promising collector for reverse flotation to remove aluminum-silicate minerals from bauxite.

Bauxite is one of the main raw materials in the alumina industry. 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 flotation desulfurization process. The physicochemical properties of high …

An innovative self-designed medium was packed in a bench-scale flotation column to study its influence on the flotation recovery of bauxite. Computational fluid dynamics (CFD) simulation was conducted …