Sequential microwave roasting and magnetic separation for removal of Fe and Ti impurities in low-grade pyrophyllite ore from Wando mine, South Korea

Kim, Bong Ju; Cho, Kang Hee; Chang, Bongsu; Kim, Hyun Soo; Lee, Sang Gil; Park, Cheon Young; Choi, Nag-Choul

doi:10.1016/j.mineng.2019.105881

Cited by 7 publications

(9 citation statements)

References 31 publications

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“…The study results indicated that Fe and Ti were removed from pyrophyllite with 86% and 68% efficiency, respectively, under 30 min of microwave irradiation and a magnetic field intensity of 2000 Gauss. Moreover, the study found that extending the microwave irradiation time and increasing the magnetic field intensity could improve impurity-removal efficiency, especially for paramagnetic Ti impurities [19]. This method can effectively upgrade low-grade pyrophyllite ore and clay minerals, which can then be exploited after removing impurities.…”

Section: Microwave Roasting and Magnetic Separationmentioning

confidence: 97%

“…For pyrophyllite, gravity separation techniques, flotation, magnetic separation, and leaching by ammonia and oxalic acid have been explored [1,8,18,28,34,35]. Furthermore, microwaves combined with sequential magnetic separation treatment have been used and considered as a promising method for upgrading low-grade pyrophyllite ore [19,36]. Under this background, the present study reviews the industrial applications of pyrophyllite and its required specifications in addition to reviewing the most effective and economical methods for enriching low-grade pyrophyllite ores.…”

Section: Gradementioning

confidence: 99%

“…Since high-grade pyrophyllite ores are rare globally, to be suitable for industry, lowgrade pyrophyllite ores must be enriched to remove impurities such as Fe and Ti and increase the alumina content [37][38][39]52]. Techniques for upgrading low-grade pyrophyllite ore vary depending on the characterization of the outcomes; these methods include physical separation techniques, chemical separation techniques, and separation techniques that combine the two [8,19]. Physical separation techniques include dry/wet magnetic separation, attrition-scrubbing, and flotation.…”

Section: Enrichment Of Low-grade Pyrophyllite Orementioning

confidence: 99%

“…The quality of pyrophyllite products is greatly affected by these impurities [18]. In addition, the presence of iron (Fe) and titanium (Ti) in pyrophyllite causes discoloration of the final product [19]. Accordingly, when pyrophyllite is used in the ceramic industry, this mineral stains the product's surface due to the presence of these impurities [12,20].…”

Section: Introductionmentioning

confidence: 99%

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Pyrophyllite: An Economic Mineral for Different Industrial Applications

Ali

Ahmed

et al. 2021

Applied Sciences

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Pyrophyllite (Al2Si4O10(OH)2) is a phyllosilicate often associated with quartz, mica, kaolinite, epidote, and rutile minerals. In its pure state, pyrophyllite exhibits unique properties such as low thermal and electrical conductivity, high refractive behavior, low expansion coefficient, chemical inertness, and high resistance to corrosion by molten metals and gases. These properties make it desirable in different industries such as refractory; ceramic, fiberglass, and cosmetic industries; as filler in the paper, plastic, paint, and pesticide industries; as soil conditioner in the fertilizer industry; and as a dusting agent in the rubber and roofing industries. Pyrophyllite can also serve as an economical alternative in many industrial applications to different minerals as kaolinite, talc, and feldspar. To increase its market value, pyrophyllite must have high alumina (Al2O3) content, remain free of any impurities, and possess as much whiteness as possible. This paper presented a review of pyrophyllite’s industrial applications, its important exploitable properties, and the specifications required for its use in industry. It also presents the most effective and economical techniques for enriching low-grade pyrophyllite ores to make them suitable for various industrial applications.

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Section: Microwave Roasting and Magnetic Separationmentioning

confidence: 97%

Section: Gradementioning

confidence: 99%

Section: Enrichment Of Low-grade Pyrophyllite Orementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Pyrophyllite: An Economic Mineral for Different Industrial Applications

Ali

Ahmed

et al. 2021

Applied Sciences

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“…While grade B, due to its high iron content, its industrial applications are limited, therefore needs treatment to remove iron because of its adverse effect on the final products. AGJSR Kim et al, 2019;Perepelitsyn et al, 2008). However, it can be used as a carrier for insecticides and as a dusting agent for the roofing and rubber industry where high purity is not required (Table 2).…”

Section: Industrial Evaluation Of Saudi Pyrophyllite Orementioning

confidence: 99%

Chemical and Mineralogical Characterization of Saudi-Pyrophyllite ore and its Potential Applications

Ali

2021

AGJSR

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Purpose: Due to the importance of pyrophyllite as an economical alternative to several minerals such as kaolin, talc, and feldspar in different industrial applications, there is an intention in Saudi Arabia to exploit pyrophyllite in the industry. Since there were no sufficient studies conducted to characterize pyrophyllite in Saudi Arabia, this paper aims to study the chemical and mineralogical characterization of Saudi pyrophyllite ore grades and propose its potential applications besides proposing beneficiation strategies for the low-grade one. Method: In this study, two different grades pyrophyllite ore samples, from a pyrophyllite deposit in western Saudi Arabia, were characterized for their potential applications. Microscopic studies, X-ray fluorescence (XRF), scanning electron microscope coupled with energy dispersive X-ray (SEM-EDX), X-ray diffraction (XRD) were used for chemical and mineralogical characterization of the studied samples. Results: Microscope and XRD results have shown that the ore samples (labeled grade A and grade B) consist mainly of pyrophyllite associated with quartz and feldspar in addition to minor amounts of muscovite, chlorite, and siderite as impurity minerals. Moreover, the results indicated that the impurities are oxide and sulfide minerals (i.e., pyrite, hematite). According to XRF analysis results, grade A contains high alumina (27.03% Al2O3) and low iron (0.4% Fe2O3) whereas; grade B contains a high iron content (2.06% Fe2O3) and lower alumina (24.05 % Al2O2). It is predicted that the grade A with high alumina content can be used directly in fillers, refractories, fiberglass, whiteware ceramics, white cement, porcelain, and cosmetic applications. As for grade B, high iron content limits its industrial applications. Therefore, it needs to be treated to remove ferrous impurities before supply to pyrophyllite market. Conclusion: Based on analytical results, grade A with high alumina content can be used directly in fillers, refractories, fiberglass, whiteware ceramics, white cement, porcelain, and cosmetic applications. Furthermore, grade B needs to upgrade due to high iron content before being used in the industry.

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