Suppression of floatability of pyrite in coal processing by carrier microencapsulation

Jha, Rani; Satur, Jacqueline; Hiroyoshi, Naoki; Ito, Mayumi; Tsunekawa, Masami

doi:10.1016/j.fuproc.2010.12.028

Cited by 16 publications

(5 citation statements)

References 17 publications

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“…At present, the M9 seam is being mined; however, previous studies and geological data indicate that the M9 coal seam is severely affected by the sedimentary environment of multiple transgressions and regressions . According to the sedimentological analysis, the marine environment is the main reason for the difference of morphological sulfur content. − Hence, there are some differences in mineralogical and elemental contents in these coal seams, which need to be further studied.…”

Section: Introductionmentioning

confidence: 99%

Mineralogy and Geochemistry of the M9 High-Sulfur Coal from the Renjiazhuang Mining District, China

Shen

Qin³

et al. 2022

ACS Omega

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According to coal lithotypes, the bottom, parting, roof, and 15 coal samples were collected by finely partitioning the M9 seam from the Renjiazhuang Mining District, Ningxia, China. Conventional chemical analysis, optical microscopy, scanning electron microscopy equipped with energy-dispersive X-ray spectrometry, X-ray diffractometry, inductively coupled plasma atomic emission spectrometry, inductively coupled plasma mass spectrometry, and atomic absorption spectrophotometry techniques were used on these samples to research the vertical variation between geochemistry and mineralogy in the high-sulfur coal. The weighted average content of total sulfur calculated from 15 coal samples is 3.07%, which belongs to the high-sulfur coal. However, the contents of morphological sulfur of 15 piles are significantly different: the contents of pyritic and organic sulfur are observed to range from 0.02 to 1.55% and from 1.88 to 3.91%. The results show that these differences are mainly controlled by marine conditions and the contents of organic matter and kaolinite. The mineralogy of the M9 coal is dominated by kaolinite, followed by dolomite, and it also contains minor amounts of illite, feldspar, pyrite, siderite, hematite, chalcopyrite, calcite, and marcasite. Moreover, pyrite is the main sulfide in coal, and agglomerated chalcopyrite and granular galena are partially visible. The forms of pyrite include fine-grained, spherical, irregular block-shaped, and clumps. Trace elements are mainly carried by pyrite and ash so that physical coal cleaning can be applied to partially remove them, while thalassophile elements Na, Ca, and Mg are closely related to organic sulfur, indicating that the coal blending can be used to decrease their contents.

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Section: Introductionmentioning

confidence: 99%

Mineralogy and Geochemistry of the M9 High-Sulfur Coal from the Renjiazhuang Mining District, China

Shen

Qin³

et al. 2022

ACS Omega

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“…Recently, carrier-microencapsulation (CME) technology has been developed (Jha et al 2011(Jha et al , 2008Satur et al 2007). The mechanism of CME is that when organic carriers (such as catechol) and metal ions (such as Ti 4+ and Si 4+ ) are added to the pulp, coordination compounds are formed on the mineral surface.…”

Section: Coal Pyrite Depressantsmentioning

confidence: 99%

“…The organic carrier is then oxidized and decomposed, and hydrophilic metal oxide/ hydroxide layers are formed by the released metal ions. Jha et al (2011) reported that the synthesized coordination compound Si(cat) 3 2− formed hydrophilic SiO 2 and Si(OH) 4 on pyrite surface (Eqs. ( 3) and ( 4)).…”

Section: Coal Pyrite Depressantsmentioning

confidence: 99%

Advances in depressants used for pyrite flotation separation from coal/minerals

Gan

Zhang

et al. 2022

Int J Coal Sci Technol

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Pyrite is separated from other minerals mainly by flotation. However, the hydrophilicity of pyrite is affected by many factors, causing it to easily enter the concentrate and consequently reduce the quality of concentrate. Highly efficient pyrite depressants can be selectively adsorbed on the surface of pyrite to improve its hydrophilicity, thereby increasing the flotation separation efficiency. Understanding the fundamental inhibition mechanism of depressants on pyrite is a prerequisite to improve the flotation desulfurization efficiency. The inhibition ability and mechanism of different types of pyrite depressants are reviewed in this manuscript. In recent years, molecular simulation has increasingly become a powerful tool to study the interaction between reagents and minerals, shedding new light on the adsorption mechanisms of reagents on mineral surfaces at the atomic and electronic levels. The properties of sulfide mineral and flotation reagents as well as the microscopic adsorption mechanistic studies of reagents on mineral surfaces based on quantum chemistry and molecular simulation are also reviewed.

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“…Researchers [5] , [6] , [7] , [8] have attempted to solve this problem via physical adjustment and chemical adjustment. The physical adjustment method is to change the surface properties of minerals through the action of physical means such as magnetic, electrical, acoustic, temperature regulation.…”

Section: Introductionmentioning

confidence: 99%