Innovative technology for the production of high-purity sand …
Under optimal leaching conditions, the SiO 2 purity of silica sand increased to 97.42%. Following a three-stage acid leaching process with 4 mol/LHCl +2 mol/LH 2 C …
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Under optimal leaching conditions, the SiO 2 purity of silica sand increased to 97.42%. Following a three-stage acid leaching process with 4 mol/LHCl +2 mol/LH 2 C …
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A leaching technology on samples of Algerian quartz sand deposit has been investigated in order to obtain high-purity silica (SiO(2)) as raw material intended for …
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When the roasting temperature increased from 750 to 825°C, the leaching rate from 56.3% to 69.7%. However, the slag roasted the temperature higher than 825°C lead to the decrease of leaching rate.
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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, …
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The effect of sulfuric acid volume on heap leaching of lanthanum from Indonesian silica sand for (a) The volume of sulfuric acid at 250 mL showed the highest extraction ability, and (b) High ...
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Under optimal leaching conditions, the SiO 2 purity of silica sand increased to 97.42%. Following a three-stage acid leaching process with 4 mol/LHCl +2 mol/LH 2 …
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An optimum silica recovery was achieved utilizing the leaching parameters of 0.250 M H 2 SO 4 concentration, 90 min leaching time, 60 ℃ temperature, and 150 …
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SiO 2 concentration increased from 96.3% in raw material to 98.3 and 98.8% after one-step and two-step leaching, respectively. Effectiveness of removing impurities increased from 54% by one step leaching method to 67.6% by two step leaching method.
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extraction (leaching) method was used in three main steps. Bengkulu be ach sand as precursors reac ted with. NaOH (alkaline fusion) at 95°C to form Na SiO, t hen addition of HCl to form Si (OH ...
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The aim of this study is to show how the design of experiments method (DOE) could be used as a practical method to model silica sand etching behavior during the leaching process. In the present work we have studied the etching effect on the particle granulometric size during a primary step of the leaching process on Algerian silica …
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The research (project) work covers the process of the purification of silica sand by the hydrofluoric acid leaching method for glass production. Fresh samples of silica sand were collected from the study area Zawan Jos South local government plateau state. The physical properties and chemical composition of the silica sand sample were determined.
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In this study, enrichment and extraction of lanthanum from Belitung silica sand was carried out using heap leaching, precipitation and complexation methods. Complexation with phytic acid with impurities metal ions on pregnant leach solution (PLS) from silica sand at room temperature was also investigated.
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To enhance the recovery of silica, the removal of impurities from the silica rock was investigated. The leached specimens were characterized by wet method, …
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Better results were obtained in this study with the sand of Maféré compared to the result obtained by Marouan Khalifa et al. (2019) in their process to produce high purity silica sand by heat ...
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The SiO 2 purity of high-grade silica reached 99.51% after acid leaching process. ... Innovative technology for the production of high-purity sand silica by thermal treatment and acid leaching process. Hydrometallurgy, 185 (2019), pp. 204-209. View PDF View article View in Scopus Google Scholar
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In this article, a leaching study, carried out on a quartz sample to obtain high-purity silica sands, has been presented. A leaching process by using oxalic acid …
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Iron Removal Process for High-Purity Silica Sands Production by Oxalic Acid Leaching. F. Vegliò B. Passariello C. Abbruzzese. Materials Science. 1999. In this …
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In our days obtaining silica sand with very high purity is a primordial stage in photovoltaic industry. The effects of acids on the removal of impurity from silica sand have been studied using leaching acids: mixture composed of HF/HCl/H 2 O with a volume composition of (1:7:24).The obtained material was characterized using
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The silica used in this work is a natural one from the region of Siliana in Tunisia. Prior to thermal annealing, silica was dipped in an acid mixture solution, HCl:HNO 3 (AS1) with a volume proportion of 2:1 to remove metallic impurities located at the surface of silica grains. Then it was abundantly rinsed with deionized water and dried under …
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The present research is related to characterize Tebessa Algerian silica sand with several techniques, to provide briquetting process and to exploit it in the silicon metal production project for photovoltaic application. Acid leaching was used to remove the impurities especially iron and aluminium found in the silica sand. Eight experiments …
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The recrystalizing process was conducted by water leaching and filtration. The derived nano particles (gel) ranged between 40-60 nm. TEM characterization showed that the products are homoge- neous, well dispersed and has specific surface area around 157 m2/g. ... Indonesia has a lot of silica sand resources and faces a challenge to increase …
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The most influencing parameters on silica leaching are leaching time and particles sand size. Our work consists of the study of etching behavior of silica with HF, since this acid can ...
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The aim of our research is to improve low-grade silica from quartz sand by removing impurities, especially aluminum and iron removal, using sulfuric acid leaching. In order to achieve the aim, the effect of reaction time and sulfuric acid concentration on the leaching process was investigated.
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Abstract This study was conducted to recover silica (desilication) as a valuable metalloid from waste foundry sand (WFS) by a leaching process and to find application for desilicated foundry sand (DFS). The leaching time applied was 5 h; 3 M of potassium hydroxide (KOH) was used as a leaching reagent. The agitation speed of …
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This study aimed to remove the contaminants in quartz sand by using an eco-friendly method and to obtain high-purity quartz. For this purpose, ultrasound-assisted acid leaching was applied. Equal amounts of a mixture of diluted hydrochloric and oxalic acids were used as the solvent. Response surface methodology (RSM) was used for …
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Subsequently, employing the "ultrasound-assisted fluorine-free acid leaching process," impurity elements were removed and high-purity silica was produced. Under optimal leaching conditions, the ...
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Abstract. The aim of this study is to show how the design of experiments method (DOE) could be used as a practical method to model silica sand etching …
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To obtain high-purity silica sands by using quartz vein ore from Dabie Mountain, Anhui province, China as raw material, this study investigated a quartz purification process that involves calcination, water quenching, flotation, acid leaching, and alcohol-deionised water cleaning procedures. The composition, particle size, phase, and …
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The production of high purity silica out of natural sand plays a critical role as a starting material in the industry of glass and high grade silicon. In this paper, we expose a novel processing method for the purification of sand silica. This method is a subsequent combination of thermal treatment and acid leaching.
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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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In the present work, we have tried to enhance the extraction rate of impurities from Algerian silica sand by means of sequential leaching process using several solvents like HF, HCl, H2SO4, NaOH. The study of leaching effect is followed by DRX and Backscattered Electron images analysis. Efficiency of the… Expand
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In our days obtaining silica sand with very high purity is a primordial stage in photovoltaic industry. The effects of acids on the removal of impurity from silica sand have been studied using leaching acids: mixture composed of HF/HCl/H 2 O with a volume composition of (1:7:24).The obtained material was characterized using Ultraviolet-Visible absorbance …
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