The effect of amorphous silica on pulp rheology and copper flotation

Chen, Xumeng; Liu, Shiqi; Hadde, Enrico Karsten

doi:10.1016/j.mineng.2017.08.001

Cited by 26 publications

(17 citation statements)

References 24 publications

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“…A number of recent studies have reported a strong relationship between flotation performance and pulp rheology. In most cases, an increase in pulp viscosity impedes the flotation kinetics with higher reagent consumption, lower recovery, and poorer selectivity (Patra et al 2012;Wang et al 2015b, Zhang andChen et al 2017c). However, some studies have demonstrated that the recovery of coarse particles and particles with high specific gravity (e.g., gold) can benefit from a slight increase in pulp viscosity owing to the formation of more stable bubble-particle aggregates (Xu et al 2012a, Zhang and).…”

Section: Effects Of Clay Network Structures On Flotation Through the mentioning

confidence: 99%

Managing clay minerals in froth flotation—A critical review

Chen

Peng

2018

Mineral Processing and Extractive Metallurgy Review

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Clay minerals are widely present in various ore deposits as gangue minerals. The processing of high-claycontent ores is becoming a significant challenge for the mining industry owing to the poor flotation performance caused by the presence of clay minerals. Different types of clay minerals are typically present in ore bodies, and they cause several detrimental effects to flotation that require different treatments. In this article, a comprehensive review of the studies on understanding and mitigating the negative effects of clay minerals in flotation is presented. It starts with a review of the classification and structures of clay minerals commonly occurring in ore deposits and their properties that determine the behavior of clay minerals in flotation. It is followed by a critical review of two main negative effects of clay minerals on flotation, the recent research findings mainly from The University of Queensland group. The first negative effect is the coating of clay minerals on the surface of valuable minerals that decreases the floatability of valuable minerals. The second negative effect is the formation of network structures in the slurry. Depending on the type and strength of the network structure, it can cause either high pulp viscosity or increased gangue entrainment, which reduces the flotation recovery and flotation product grade, respectively. In this section, the mechanisms and key factors behind each negative effect are presented and critically discussed. Then, the approaches and techniques developed to mitigate the different negative effects of clay minerals are reviewed. To conclude, future directions for a more complete understanding of mechanisms and problem solving are recommended.

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Section: Effects Of Clay Network Structures On Flotation Through the mentioning

confidence: 99%

Managing clay minerals in froth flotation—A critical review

Chen

Peng

2018

Mineral Processing and Extractive Metallurgy Review

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“…Zhang and Peng (2015) found that clay minerals modified the pulp rheology depending on the type of clay minerals present. High pulp apparent viscosity was related to decreased gold flotation, and slightly increased pulp apparent viscosity by clay minerals enhanced gold flotation Chen et al (2017). found that amorphous silica caused a significant increase in the apparent viscosity of the pulp.…”

Section: Analysis Of Suspension Apparent Viscositymentioning

confidence: 88%

Effect of ultrafine kaolinite particles on the flotation behavior of coking coal

Xia

Peng

et al. 2020

Int J Coal Sci Technol

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Kaolinite, as a mineral in fine coal, has an important influence on the flotation of coal particles. In this study, the effects of ultrafine kaolinite particles on the flotation recovery of coal particles were investigated. Flotation tests were carried out using a mixture of coal particles and different amounts of ultrafine kaolinite particles. Combined with the Stefan-Reynold theory, the effect of liquid film drainage rate between coal bubbles in a kaolinite suspension was calculated. The yield of flotation clean coal increases quickly with the increasing content of ultrafine kaolinite particles. The ultrafine kaolinite particles can reduce the surface tension of the suspension, weaken the bubble coalescence, and stabilize the structure of the froth layer. In addition, the ultrafine kaolinite particles increase the apparent viscosity of the flotation pulp slightly. It is concluded that the role of ultrafine kaolinite particles on the positive effect of froth properties conceals the negative effect on the liquid film drainage rate between coal particles and bubbles caused by the kaolinite particles, which ultimately leads to an increasing yield of clean coal with an increasing content of kaolinite particles. This study is important for understanding the influence of ultrafine kaolinite on coal particle flotation.

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“…The actual turbidity increase may have resulted from the presence of fine kaolinite in the pulp, which is beneficial for the dispersion of diaspore or pyrite. Generally, the better the particles are dispersed in the pulp, the more helpful they are for flotation [36]. However, in the flotation test, with the addition of kaolinite, the recovery of pyrite was reduced.…”

Section: Hetero-aggregation Of Fine Minerals With Pyrite or Diasporementioning

confidence: 99%

Effects of Fine Minerals on Pulp Rheology and the Flotation of Diaspore and Pyrite Mixed Ores

et al. 2020

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In this study, the effects of four fine minerals, which were fine diaspore (FDIA), kaolinite, illite, and pyrophyllite (D50 is about 4.55 μm, D80 is about 10.78 μm), on the pulp rheology of the diaspore and pyrite mixed ores (D50 is about 120.53 μm, D80 is about 187.36 μm) and the recovery of pyrite were investigated through flotation tests, pulp rheology measurements, and sedimentation tests. It was found that fine minerals could change the pulp rheology and affect the pyrite recovery. The apparent viscosity of the mixed ores slurry increased with the addition of FDIA, kaolinite, and illite and the pyrite recovery decreased in varying degrees. When the addition was 15 wt.%, the recovery of pyrite decreased from 92.3% to 60.8%, 81.4%, and 84.7%, respectively. The addition of pyrophyllite had a significant deteriorating effect on flotation. When the addition of pyrophyllite was 5 wt.%, the pyrite recovery was reduced to 49.2%, and when the addition was further increased to 15 wt.%, the pyrite recovery reduced to 28.5%. However, the effect of pyrophyllite addition on the pulp rheology of the mixed ore was not remarkable. Pyrophyllite affected pyrite recovery not only by affecting the rheological behavior of the pulp, but also because pyrophyllite was adsorbed on the surface of pyrite and diaspore, producing hetero-aggregation, which made it difficult for the pyrite particles to collide with the bubbles effectively. This was the main reason for the reduction of pyrite recovery. Generally, the order in which the reduction of pyrite recovery was affected by the additions of fine minerals was pyrophyllite > FDIA > kaolinite > illite.

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The effect of amorphous silica on pulp rheology and copper flotation

Cited by 26 publications

References 24 publications

Managing clay minerals in froth flotation—A critical review

Managing clay minerals in froth flotation—A critical review

Effect of ultrafine kaolinite particles on the flotation behavior of coking coal

Effects of Fine Minerals on Pulp Rheology and the Flotation of Diaspore and Pyrite Mixed Ores

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