Effects of Ball Size on the Grinding Behavior of Talc Using a High-Energy Ball Mill

Kim, Hyun Na; Kim, Jin Woo; Kim, Min‐Sik; Lee, Bum Han; Kim, Jin Cheul

doi:10.3390/min9110668

Cited by 33 publications

(17 citation statements)

References 37 publications

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“…Many papers are reporting the effect of different parameters on grinding such as grinding media as ball, rod, and autogenous Yekeler et al, 2004), ball size (Kim et al, 2019), and dry or wet grinding (Feng and Aldrich, 2000). In these studies, showed that while rounder quartz particles (Ro=0.919) were obtained with ball-milled products it became angular in the case of rod milled products (Ro=0.915).…”

Section: Shape Characterization Of An Individual and Binary Mixture Omentioning

confidence: 99%

Effect of particle shape properties on selective separation of chromite from serpentine by flotation

Güven¹,

Serdengeçti²,

Tunç³

et al. 2020

Physicochem. Probl. Miner. Process.

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Although many studies have been conducted on the morphological variations and its effects on flotation recoveries of a single mineral system, a systematic study for the flotation behavior of mixtures of minerals has not dwelled much. In this study, th flotation behavior of chromite and serpentine minerals was investigated to distinguish and isolate the contribution of morphology in single and binary systems. For this purpose, the shape analyses for the minerals ground as single and mixture were performed, and their flotation behaviors determined with the micro-flotation experiments. Additionally, the zeta potential measurements were carried out in the presence of sodium oleate as a collector. The shape analysis of the ground samples showed that while the roundness values of chromite and serpentine (gangue) minerals as single were quite different, the particle shape of chromite favored serpentine in the mixture system which in turn suggested that the mineral with the high hardness value dominates the shape characteristics in binary grinding conditions. Accordingly, while the flotation characteristics of chromite in the mixture followed the same trend with the flotation of a single chromite system as a function of particle shape, almost a reverse trend was obtained for the shape and flotation of serpentine in the mixture compared to a single serpentine system. Thus, at roundness values of chromite particles from 0.797 to 0.732, the flotation recoveries of chromite in the mixture increased from 51.0% to 75.4%. On the other hand, likewise chromite, the flotation recoveries of serpentine increased from 20.0% to 37.3% proportional to the roundness range of 0.757 and 0.709. These findings in turn showed that the grinding conditions dictate the soft component to be monitored by the harder and denser component which dominates the angularity and floatability of the mixture.

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Section: Shape Characterization Of An Individual and Binary Mixture Omentioning

confidence: 99%

Effect of particle shape properties on selective separation of chromite from serpentine by flotation

Güven¹,

Serdengeçti²,

Tunç³

et al. 2020

Physicochem. Probl. Miner. Process.

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“…This tendency can be related essentially to the fitting errors of calculation and partially to the reduction of the crystallinity according to the duration of the grinding process. In previous studies (Takahashi 1957;Kim et al 2019;Hlavay et al 1978), it has been confirmed that, the intensity of peaks as well as their broadening are decreasing with the grinding time. It is explained by the creation of an amorphous layer (~ 30 nm) during the powdering process known as Beilby-Bowden layer (Bowden and Hughes 1937;Castro et al 2012).…”

Section: Discussionmentioning

confidence: 62%

Modal Analysis of Rock Forming Minerals: Contribution of XRD/Rietveld Analysis Compared to the Classic Point Counting Method

Samouh

Nishimoto

Yoshida³

et al. 2021

ACT

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The determination of the mineral composition of aggregates which constitute an important component of concrete is essential to understand and estimate the durability of structures. The modal (quantitative mineralogical) analysis of rocks is generally determined by point-counting method on thin sections or slabs. However, there is a difficulty of mineral identification depending not only on the experience and capability of the operator but also on the size of observable grains. In this study, XRD (X-Ray Diffraction)/Rietveld analysis is proposed as an alternative and a comparison study is performed for eight different rocks. The results show equivalent proportions to those of the point counting method for the major phases (minerals), although discrepancies are observed for the minor minerals. Complementary tests as XRF (X-Ray Fluorescence) and density measurements are also performed to pre-characterize and confirm the obtained modal analysis. For instance, the density calculations based on XRD/Rietveld analysis provide close values to the measured densities. Overall, this method can be an excellent alternative to the point counting method especially in the context of construction materials laboratory.

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“…The interaction between components results in the decrease of the specific energy of the mixture if compared with the mass average one of components in single breakage. Breakage resistance of hard anthracite decreases due to the addition of soft bituminous coal, and grinding energy efficiency of anthracite is also improved compared with that of single grinding.Minerals 2020, 10, 230 2 of 15 increased [1][2][3]. Statistical data indicate that the grinding process consumes about 70% of the total energy in mineral preparation plants [4].…”

mentioning

confidence: 99%

“…Minerals 2020, 10, 230 2 of 15 increased [1][2][3]. Statistical data indicate that the grinding process consumes about 70% of the total energy in mineral preparation plants [4].…”

mentioning

confidence: 99%

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Grinding Behaviors of Components in Heterogeneous Breakage of Coals of Different Ash Contents in a Ball-and-Race Mill

Duan

Zhao

et al. 2020

Minerals

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Coals used for power plants normally have different ash contents, and the breakage of coals by the ball-and-race mill or roller mill is an energy-intensive process. Grinding phenomena in mill of power plants is complex, and it is also not the same with ideal grinding tests in labs. The interaction among various coals would result in changes of grinding behaviors and energy consumption characterization if compared with those of single breakage. In this study, anthracite and bituminous coal of different ash contents were selected to be heterogeneously ground. Quantitation of components in products was realized using the relation between sulfur content of the mixture and mass yield of one component in the mixture. Product fineness t 10 of the component was determined, and split energy was calculated on the premise of specific energy balance and energy-size reduction model by a genetic algorithm. Experimental results indicate that breakage rate and product fineness t 10 of the mixture decrease with the increase of hard anthracite content in the mixture. Unlike the single breakage, t 10 of anthracite in heterogeneous grinding is improved dramatically, and bituminous coal shows the opposite trend. The interaction between components results in the decrease of the specific energy of the mixture if compared with the mass average one of components in single breakage. Breakage resistance of hard anthracite decreases due to the addition of soft bituminous coal, and grinding energy efficiency of anthracite is also improved compared with that of single grinding.Minerals 2020, 10, 230 2 of 15 increased [1][2][3]. Statistical data indicate that the grinding process consumes about 70% of the total energy in mineral preparation plants [4]. Hence, any improvement in the grinding process would lead to a significant reduction of energy required for mineral beneficiation. In China, nearly 60% of the raw coal is applied for electric power generation, and it should be ground to pulverized fuel (PF) for improving combustion efficiency [5]. Generally, ball-and-race mills or roller mills are used to produce the PF, of which >85% of fines are finer than 90 µm PF [6]. It is estimated that the spent energy in this process accounts for 0.5-2% of total electrical power of the coal power plant [7]. Though this proportion is not big, the total energy loss from coal power plants in China is tremendous given the total electric power generation capacity of China. Unfortunately, this issue has not been paid enough attention by electricity producers in China.Normally, the heat efficiency of boilers used in power plants is closely related to the properties of coals that are burnt inside, therefore, the boiler in a power plant is designed according to the quality of coal. Note that in some parts of the world, supplied raw coals are from various mines, and they show obvious differences in quality. Under this situation, coal blending prior to combustion in a boiler becomes very necessary to ensure an optimum heat efficiency. This, in turn, brings up chall...

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Effects of Ball Size on the Grinding Behavior of Talc Using a High-Energy Ball Mill

Cited by 33 publications

References 37 publications

Effect of particle shape properties on selective separation of chromite from serpentine by flotation

Effect of particle shape properties on selective separation of chromite from serpentine by flotation

Modal Analysis of Rock Forming Minerals: Contribution of XRD/Rietveld Analysis Compared to the Classic Point Counting Method

Grinding Behaviors of Components in Heterogeneous Breakage of Coals of Different Ash Contents in a Ball-and-Race Mill

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