High efficiency iron removal from quartz sand using phosphoric acid

Zhang, Zhizhen; Li, Jingsheng; Li, Xiaoxia; Huang, Houquan; Zhou, Lifen; Xiong, Tiantian

doi:10.1016/j.minpro.2012.09.001

Cited by 57 publications

(29 citation statements)

References 15 publications

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“…Figure 3b is an image of hematite (the mineral phase was determined by polarizing microscope within an electron probe microanalyzer) in quartz, and its composition (Table 2) shows that the secondary mineral contains elevated Fe (the Cr is from polishing powder). Generally, the iron in high-grade quartz is typically less than 1 ppm [31]. It is difficult to remove some filmy iron on the surface of quartz particles by conventional physical methods [32].…”

Section: Optical Microscope Analysismentioning

confidence: 99%

Mineralogy and Processing of Hydrothermal Vein Quartz from Hengche, Hubei Province (China)

2017

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Quartz occurs in many geological materials, and is used in numerous industrial fields as a raw material. Mineralogy and the processing of hydrothermal quartz were studied by optical microscope, electron probe microanalysis, scanning electron microscope, inductively coupled plasma-optical emission spectrometry, and inductively coupled plasma mass spectrometer. A combination of the geological occurrence of the quartz deposit, mineralogical studies, and the processing technologies of the hydrothermal quartz was accomplished. The results show that impurities within the quartz mainly include muscovite, hematite, apatite, and secondary fluid inclusions. The main chemical impurities are Al (353 µg·g −1 ), K (118 µg·g −1 ), Fe (61.2 µg·g −1 ), P (15.5 µg·g −1 ), Na (13.4 µg·g −1 ), Mg (11.8 µg·g −1 ), Ti (8.31 µg·g −1 ), and B (10.8 µg·g −1 ). Based on these results, a combined process consisting of calcination and fluoride-free pressure acid leaching was established to effectively decompose and dissolve the quartz, and remove gangue minerals and fluid inclusions. The calcination process not only removed volatile components; it also destroyed the crystal structure of gangue minerals and enhanced their release probabilities. The calcination process has a positive influence on the removal of impurity elements by the fluoride-free pressure acid leaching process. A total of 85.2 wt % and 84.0 wt % of impurity elements was removed using the leaching systems of HCl-NH 4 Cl and H 2 SO 4 -NH 4 Cl, respectively.

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Section: Optical Microscope Analysismentioning

confidence: 99%

Mineralogy and Processing of Hydrothermal Vein Quartz from Hengche, Hubei Province (China)

2017

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“…Regarding the iron leaching, hydrogen ions play an important role in the dissolution of iron oxides with inorganic acids. The H3PO4 in solution provides H + , that reacts with iron oxide, and the possible reaction according Zhang et al [12], might be:…”

Section: Resultsmentioning

confidence: 99%

“…Early works, phosphoric acid was reported as leaching iron in kaolin clay [11]. Similarly, the influence of phosphoric acid in iron removal from quartz sand bleaching was also studied [12]. Also, statistical analysis was conducted to determine the most influential factors in the dissolution with organics acids used as a leaching reagent to remove iron from a kaolin mineral [13,14].…”

Section: Introductionmentioning

confidence: 99%

“…Recently, the general concepts and fundamentals of the biological dissolution of iron from kaolin clays had been studied by Hosseini et al [15]. Among the organic and inorganic acids [6][7][8][9][10][11][12][13]16], the biological beneficiation, [15,17,18] a combination of both [19][20][21] and the anionic surfactants, the first are the most common reagents to remove iron oxides and oxyhydroxides contained in kaolin clay [22]. However, goethite species have been removed with anionic surfactants, increasing the whiteness index [23].…”

Section: Introductionmentioning

confidence: 99%

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Kinetics of Iron Leaching from Kaolinitic Clay, Using Phosphoric Acid

et al. 2016

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Abstract:Kaolin is important because it has many applications in the paper, paint-coating, functional filler, extender and pigment industries. This material needs to be bleached by iron leaching to be useful for these applications because this element can be the principal cause of its undesirable coloration. In this work, the kinetics of leaching of iron contained in kaolin clays from the community of Agua Blanca Iturbide, Hidalgo, Mexico, was studied. The leaching experiments were carried out using phosphoric acid as the reagent of leaching for the iron dissolution process. Temperature, acid concentration, and particle size were investigated to determine the most important kinetics parameters during iron leaching. It was determined that the rate of iron dissolution increases with increasing of phosphoric acid concentration, the temperature, and decreased particle size of clay. Data obtained showed that iron dissolution from kaolin clay is due to the diffusion of iron through the product layer. The results revealed that the activation energy of the process was 10.18 kJ¨mol´1.

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“…Titanium and chromium may melt and will color the glass. In addition, the silicon solar grade destined for the photovoltaic application required a very high purity of silica (>99.999%) with Fe must be less than 1 ppm (Xakalashe and Tangstad, 2011 Tuncuk and Akcil (2014); Suratman and Handayani (2014);and Zhang et al (2012). Those techniques are very efficient in removing metal impurities, but they are generally costly and have a considerable impact on the environment.…”

Section: Introductionmentioning

confidence: 99%

Bioleaching of Lodan quartz using Aspergillus ficuum

Handayani¹

2017

IMJ

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Depending on its purity, quartz has a wide application in industry. Fungi play an important role in the quartz purification. A bioleaching study of Lodan quartz sample from Rembang, Central Java was conducted to obtain a suitable raw material for industrial applications. The microbial process using selected-indigenous fungus of Aspergillus ficuum in terms of removing iron, aluminum, and other unwanted metals within quartz. The result was then compared to the chemical leaching using pure citric and oxalic acids. The bioleaching process removed the iron (Fe2O3) from the initial content (0.78%) in the original sand sample to reach a level of 0.013% Almost 98.3% iron was removed. The bioleaching test also removed the aluminum, manganese, chrome, and titanium to a very low level within the 12-day process. The iron content in this treated quartz met the standards for optical and high-quality glass. On the other hand, the chemical leaching using pure citric and oxalic acids concentrations were equal to those that were produced by A. ficuum could only removed 70.5% of iron around 0.23% iron and 0,29 % aluminium were still remained in the sand. This fact suggested that the bioleaching method is more effective than the chemical one using the organic acids. The use of fungi to remove iron from quartz has the potential to be an effective method for upgrading the content and the commercial value of the quartz. The experimental results of this study have provided significant opportunity to use biotechnological approach for producing the quartz as a feed material for the highquality glass industry.

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High efficiency iron removal from quartz sand using phosphoric acid

Cited by 57 publications

References 15 publications

Mineralogy and Processing of Hydrothermal Vein Quartz from Hengche, Hubei Province (China)

Mineralogy and Processing of Hydrothermal Vein Quartz from Hengche, Hubei Province (China)

Kinetics of Iron Leaching from Kaolinitic Clay, Using Phosphoric Acid

Bioleaching of Lodan quartz using Aspergillus ficuum

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