Drum leaching tests in iron removal from quartz using oxalic and sulphuric acids

Vegliò, Francesco; Passariello, B.; Bárbaro, M. B.; Plescia, P.; Marabini, A.M.

doi:10.1016/s0301-7516(98)00014-3

Cited by 69 publications

(57 citation statements)

References 17 publications

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“…These mica minerals usually contain impurity elements of Al, K, Fe, and Ti, etc., which could evidently reduce quality of quartz products [2,3]. High-efficiency separation of the muscovite from quartz ore has been focused on by researchers for a long time [4,5]. In recent years, fluorine-free flotation has been developed to separate muscovite with quartz [6,7], but the flotation technique is only suitable for separating liberated ores, although separation efficiency of muscovite and quartz is not high enough [8,9].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, pressure acid leaching with mixed agents consisting of acids and inorganic salts is deemed to be an effective method to dissolve and remove muscovite without using any fluorides [13,14]. Metallic ions in the inorganic salts are unacceptable in quartz purification because they would unavoidably drag in metallic impurities during processing, but the use of NH 4 Cl avoids the problem. Mixed leaching agents consisting of H 2 SO 4 and NH 4 Cl show great effects on removing trace muscovite from hydrothermal vein quartz with high leaching pressure and extremely low acid consumptions [15].…”

Section: Introductionmentioning

confidence: 99%

“…Metallic ions in the inorganic salts are unacceptable in quartz purification because they would unavoidably drag in metallic impurities during processing, but the use of NH 4 Cl avoids the problem. Mixed leaching agents consisting of H 2 SO 4 and NH 4 Cl show great effects on removing trace muscovite from hydrothermal vein quartz with high leaching pressure and extremely low acid consumptions [15]. Table 1 presents the impurity contents of ore and concentrate, and detailed process conditions [15].…”

Section: Introductionmentioning

confidence: 99%

“…Separation efficiency of the trace muscovite and quartz can reach 98.10% when total removal rate of impurity elements is about 84.0%. 4 Cl, 5 mL/g of L/S ratio, leaching temperature of 250 • C, leaching time of 6 h.…”

Section: Introductionmentioning

confidence: 99%

“…When the c(NH 4 Cl)/c(H 2 SO 4 ) ratio was 2/1, Al content obviously decreased with H 2 SO 4 concentration (0.025 mol/L to 0.300 mol/L), and remained approximately constant from 0.300 mol/L to 0.500 mol/L [16]. Hence, the quartz samples leached by the NH 4 Cl-H 2 SO 4 solution with low concentrations can be used for microscopic analysis so as to investigate dissolution behaviors of trace muscovite.…”

Section: Introductionmentioning

confidence: 99%

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Dissolution Behaviors of Trace Muscovite during Pressure Leaching of Hydrothermal Vein Quartz Using H2SO4 and NH4Cl as Leaching Agents

et al. 2018

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Dissolution behaviors of trace muscovite during pressure leaching of hydrothermal vein quartz using H 2 SO 4 and NH 4 Cl as leaching agents have been studied by means of optical and electronic microscopes. Phase transformations of pure muscovite during calcination and the pressure leaching were analyzed by powder X-ray diffraction (XRD) and thermal analysis (TG-DSC), which are used for indirectly discussing dissolution mechanisms of the trace muscovite. Structure damages of trace muscovite are caused by calcination, and further developed during pressure leaching of the quartz sand using H 2 SO 4 and NH 4 Cl as leaching agents. The trace muscovite is dissolved, and then efficiently separated from quartz sand by coupling effects of calcination and fluorine-free pressure leaching.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Dissolution Behaviors of Trace Muscovite during Pressure Leaching of Hydrothermal Vein Quartz Using H2SO4 and NH4Cl as Leaching Agents

et al. 2018

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Optimization of process parameters and dissolution kinetics of nickel and cobalt from lateritic chromite overburden using organic acids

Biswas

Chakraborty

Chaudhuri

et al. 2014

J of Chemical Tech & Biotech

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BACKGROUND: Leaching kinetics of the roasted (at 600• C) chromite overburden of Sukinda mines Orissa, India, was studied with optimized data generated through response surface methodology (RSM) coupled with Box-Behnken design (BBD). The effects of oxalic, citric and gluconic acid concentration (50-150 mmol L −1 ), reaction temperature (60 • to 80• C) and period (up to 3 h) on metal (nickel and cobalt) dissolution were examined.

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Removal of iron from ilmenite by KOH leaching-oxalate leaching method

Wang

Chu

et al. 2010

Rare Metals

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Oxalic acid was used for the removal of iron from the intermediates of ilmenite leached by KOH liquor. Various parameters, such as pH, temperature, initial oxalate concentration, and illumination were investigated. Meanwhile, it was found that orthorhombic crystal Ti 2 O 2 (OH) 2 (C 2 O 4 )⋅H 2 O formed as the leaching proceeded. Scanning electronic microscope (SEM) images implied that the formation of Ti 2 O 2 (OH) 2 (C 2 O 4 )⋅H 2 O with good crystallinity proceeded through three stages. Calcining Ti 2 O 2 (OH) 2 (C 2 O 4 )⋅H 2 O, anatase (350°C) or rutile (550°C) type TiO 2 was obtained, respectively. Element analysis found that the calcined product contained 94.9% TiO 2 and 2.5% iron oxide, but only about 1600 ppm dissolvable iron oxide was left, which indicates that oxalic acid was comparatively effective on iron oxide removal from the intermediates. Finally, an improved route was proposed for the upgrading of ilmenite into rutile.

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Drum leaching tests in iron removal from quartz using oxalic and sulphuric acids

Cited by 69 publications

References 17 publications

Dissolution Behaviors of Trace Muscovite during Pressure Leaching of Hydrothermal Vein Quartz Using H2SO4 and NH4Cl as Leaching Agents

Dissolution Behaviors of Trace Muscovite during Pressure Leaching of Hydrothermal Vein Quartz Using H2SO4 and NH4Cl as Leaching Agents

Optimization of process parameters and dissolution kinetics of nickel and cobalt from lateritic chromite overburden using organic acids

Removal of iron from ilmenite by KOH leaching-oxalate leaching method

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