Characterization and removal of iron from pyrophyllite ore for industrial applications

Jena, Sandeep Kumar; Singh, Satyavir; Rao, D. Sreenivasa; Dhawan, Nikhil; Misra, Pratibha; Das, B.

doi:10.1007/bf03402427

Cited by 5 publications

(16 citation statements)

References 15 publications

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“…Moreover, several studies have used electrolysis, flotation, and electrification to remove sulfur, chlorine, iron, and titanium from non-metallic minerals [20,28,33]. 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].…”

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%

“…For example, pyrophyllite provides low thermal and electrical conductivity; high refractive behavior; a low expansion coefficient; high corrosion resistance; low bulk density; and low hot-load deformation [6]. Therefore, this mineral is widely used in the refractory, ceramic, fiberglass, pesticide, fertilizer, paper, paint, plastic, rubber, cement, building-material, and pharmaceutical industries [7][8][9]. Furthermore, since pyrophyllite has a lower coefficient of expansion and thermal conductivity compared to clay, pyrophyllite is suitable for refractory applications [10,11].…”

Section: Introductionmentioning

confidence: 99%

“…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]. Moreover, small amounts of iron lead to a decrease in the melting point of the refractory materials, affect the transparency of glass products, and reduce transmission in optical fibers [1,3,8]. Therefore, the most desirable percentage of iron in the pyrophyllite ore for use in industrial applications was determined in a previous study [8].…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, small amounts of iron lead to a decrease in the melting point of the refractory materials, affect the transparency of glass products, and reduce transmission in optical fibers [1,3,8]. Therefore, the most desirable percentage of iron in the pyrophyllite ore for use in industrial applications was determined in a previous study [8]. For example, in the refractory industry, the ore should contain less than 1% iron; in pottery and tile manufacturing, the ore should contain less than 0.5% iron; and in the paper industry, the ore should contain less than 1% iron [21].…”

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: Gradementioning

confidence: 99%

Section: Enrichment Of Low-grade Pyrophyllite Orementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

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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Effective utilisation of waste fines in preparation of high-basicity double-layer DRI pellets for minimisation of sticking

Mandal

Sinha

2016

Mineral Processing and Extractive Metallurgy

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Sinter of high basicity is well known for affecting the permeability of the burden in the lower portion of the blast furnace due to the formation of more viscous slag. The high-basicity pellets possess less weather resistance if hardened below 1200°C due to the presence of free lime particles. When hardened above 1200°C, the weather resistance increases with increasing sticking tendency among the pellets due to the formation of low-melting eutectics. In the present investigation, efforts were made to make composite-coated iron ore-fluxed pellets to minimise the problems mentioned above. Lime addition to the core of pellets varied from 5 to 100%. The composite pellets subsequently were fired at 1150, 1200 and 1250°C for 30 min. Increasing lime content in the pellets resulted in increasing crushing and drop strength of the green pellets. The percent of reduction and cold crushing strength were found comparable to the conventional pellets with varying lime content up to 30% (core basicity 4.68). Weathering resistance was also found increasing trends with increasing firing temperature. XRD analysis revealed the presence of free lime particles inside the core of composite pellets with increasing lime content. From the present work, it could be concluded that the composite-fluxed pellet made with 20% lime in the core (core basicity 3.0) has enough physical strength (187 kg), a high percentage of reduction (96%) and excellent weather resistance properties.

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