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Innovative process for the extraction of 99.99% high-purity quartz …

After acid leaching, the resultant quartz is washed with deionized water to reach a neutral pH and to remove surface impurities, yielding HPQ 1. After a subsequent grinding process, HPQ 1 is ground to a fineness below 5000 …

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Effect of quartz crystal structure transformations on the …

A comparison of impurity contents in different quartz samples after acid leaching is exhibited in Fig. 10. With the increase of the roasting temperature, the removal of impurities changed, and the extraction was the best at 900 °C; the lowest total impurity content was 70.6 μg/g, and the iron impurity content was reduced to 2.8 μg/g. ...

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The Effects of Calcination-Water Quenching on Quartz

The results show that the purification effects of grinding-calcination-water quenching-classification-acid leaching process and grinding-classification-acid leaching-calcination-water quenching ...

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Prepare and Mechanism of High Purity Quartz by Alkali …

Prepare of high-purity quartz using vein quartz by alkali corrosion and acid leaching processes was investigated in this study. Using alkali corrosion method, the impurities on the surface of quartz particles can be removed and the cracks on the quartz surface can be deepened and enlarged, accompanied by the existence of corrosion pits, which is …

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Prepare and Mechanism of High Purity Quartz by …

Prepare of high-purity quartz using vein quartz by alkali corrosion and acid leaching processes was investigated in this study. Using alkali corrosion method, the impurities on the surface of ...

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Separation mechanism of lattice-bound trace elements from quartz …

Subsequently, the obtained quartz concentrate was subjected to an acid mixture leaching procedure to extract its impurities and obtain high-purity quartz. The optimal conditions determined for the magnetic separation process were a solid concentration of 4% and slurry flow velocity of 0.12 m/s.

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Advanced Processing Techniques and Impurity …

Zhang et al. used phosphoric acid as the leaching agent for quartz sand under the conditions of 80 °C temperature, 10% solid-to-liquid ratio, quartz sand with a particle size of less than 100 mesh, and …

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The Effects of Calcination-Water Quenching on Quartz …

It was conducive to acid leaching, and the total amount of residual impurities is the least at this time. When the process was set before acid leaching, it played a direct auxiliary role in acid leaching. In addition to cracking the inclusions, the cracks only allowed the acid leaching agent to penetrate into the interior of quartz particles.

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Muuadh et al Quartz bleaching sulfuric acid

Zhou (2005) leached about 75% of coloring impurities including Al, Ti and Fe by using 28.6% HF acid at 120 °C. Zhang et al (2012) stated that phosphoric acid was a good leaching agent for iron removal from quartz sand because of …

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A Critical Review on the Mineralogy and Processing for High-Grade Quartz

High-purity quartz (SiO2) is an important material widely used in many industries, including semiconductor technology, telecommunication, and optics. The content and distribution of impurities in quartz significantly affect the processing methods. This paper provides an insightful review on the processing of high-purity quartz, covering the …

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Purification mechanism of microcrystalline graphite and …

Throughout the alkali autoclave-acid leaching process, quartz could be completely dissolved in the alkali autoclave reaction stage. Mica and kaolinite were dissolved and recrystallized to form hydrated sodium aluminosilicates, dominated by cancrinite and sodalite, which were removed by pickling. Iron (hydrogen) oxide could be …

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(PDF) Iron removal from red clay using oxalic acid leaching …

Additionally, leaching experiments were conducted with varying concentrations of oxalic acid, temperatures and times. After leaching, the red clay composition changed significantly: SiO₂ ...

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High Purity Quartz Sand: What Is It Used for and How to Get …

Method 2: Acid leaching. Acid leaching utilizes the characteristics that quartz is insoluble in acid (except HF) and other impurity minerals can to purify quartz sand. Dilute acid has a better effect on removing Al and Fe, and more acidic concentrated sulfuric acid, aqua regia, and hydrofluoric acid are used to remove Cr and Ti.

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Prepare and Mechanism of High Purity Quartz by Alkali

Prepare of high-purity quartz using vein quartz by alkali corrosion and acid leaching processes was investigated in this study. Using alkali corrosion method, the …

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Preparation of high-purity SiO2 by S-HGMS coupled with mixed-acid

Although the cost is high, in the purification of raw materials containing quartz, processing of high-purity quartz sand via acid leaching is the most effective and necessary method (Huang et al., 2013, Vapur et al., 2017). Different acids have different effects on the extraction of impurities (Pei et al., 2018, Yang et al., 2021b).

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Drum leaching tests in iron removal from quartz …

Keywords: quartz; iron removal; oxalic acid; leaching 1. Introduction Industrial minerals such as quartz, usually contain some iron, indeed many major deposits are contaminated by small amounts (0.5–3%) of iron …

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[PDF] Trace muscovite dissolution separation from vein quartz …

Effects of sulphuric acid and ammonia chloride on muscovite dissolution were studied in acid leaching of vein quartz under elevated temperature and pressure. The leaching processes have been studied in detail by analyzing sources of impurity minerals, optimizing leaching process, analyzing leaching kinetics of Al in muscovite …

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Quartz Processing | Equipment, Process Flow, …

5 Acid leaching. Acid leaching is the use of quartz insoluble in acid (except HF), other impurity minerals can be dissolved by acid, further purification of quartz. Acids commonly used for acid …

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Preparation of NaA Zeolite from High Iron and Quartz …

In this study, NaA zeolite was successfully synthesized from coal gangue with high contents of iron and quartz as the main raw material. The results show that most iron ions can be removed from coal gangue after calcination at 700 °C for 2 h, leaching in hydrochloric acid with a mass fraction of 20% for 7 h and a liquid-solid ratio of 3.5:1. …

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Resource, characteristic, purification and application of …

Oxalic acid is another acid used for acid leaching of quartz, which is a dicarboxylic acid and a medium-strength organic acid, whose chemical formula is HOOC …

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Calcination-fluorine-free and nitric acid leaching to remove …

It can be inferred that the quartz ore can produce cracks after calcination and water quenching, and the cracks will expose the impurities inside the quartz sand., can promote the effect of impurity removal by acid leaching. (3) The calcined quartz sand is acid-leached with 0.6mol/L oxalic acid, 08mol/L acetic acid and 0.6mol/L sulfuric acid ...

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Drum leaching tests in iron removal from quartz using …

Then, the objective is that of developing a commercially viable process for the removal of iron from quartz by acid leaching in the presence of reducing and/or complexing agents such as oxalic acid: the use of oxalic acid seems to be attractive, mainly for its better action on the iron removal with respect the mineral acids, and for less ...

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Purification Mechanism of Quartz Sand by Combination of …

Iron is a major impurity in quartz sand and must be strictly removed in many applications. However, the iron removal rate in most of the conventional purification process is not high enough. In this study, a fast, low-energy consuming, environment-friendly and simple process for purifying quartz is demonstrated by a combination of microwave …

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Purification Mechanism of Quartz Sand by Combination of …

Effect of microwave treatment time on the removal rate of element Fe and the residual element Fe in quartz matrix (Microwave treatment at 400 °C for different time; acid leaching with 2 mol/L HNO ...

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US5037625A

Quartz is purified by removing mineral impurities, particularly alkali metal impurities, from within the quartz crystal lattice structure. According to the disclosed process, quartz crystals are subjected to a pretreatment that removes surface bound impurities and then contacted with gaseous HCl at a temperature of from 800 DEG C. to 1600 DEG C. for a …

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Dissolution Behaviors of Trace Muscovite during Pressure Leaching …

In the conventional process of oxygen pressure acid leaching of quartz ore, purification of quartz sand depends on acid attack to mica minerals, resulting in high acid consumption and a long leaching time . The two problems lead to significant decreases in equipment life and production efficiency, and an obvious increase in …

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Kinetic Laws of the Hydrochloric Acid Leaching of the Slime from Quartz

Abstract The kinetics of atmospheric hydrochloric acid leaching of the iron-containing slime formed during quartz–leucoxene sandstone beneficiation is studied. The calculated activation energies indicate two temperature ranges of the slime leaching: a diffusion kinetic region at 40–70°C (Ea = 35.79–36.56 kJ/mol) and a kinetic region at …

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An experimental study of removing impurity from a …

Since quartz is insoluble in acid (except HF), acid leaching is often used to remove the iron film on the surface of quartz particles and iron impurities. The dissolving speed of mica and feldspar is higher than quartz in HF solution, therefore, HF can be used as the main chemical leaching agent for quartz purification (Zhou, 2005).

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A Critical Review on the Mineralogy and Processing for High …

High-purity quartz (SiO2) is an important material widely used in many industries, including semiconductor technology, telecommunication, and optics. The …