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 (UV-Vis) and Inductively Coupled Plasma Atomic Emission Spectroscopy (ICP-AES). ...
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sand leaching aluminum removal iron removal silica C 1 10.1/12061.2021.22626 Receied ate: 14.01.2021 ... ficiation o silica sand using a shaking table and magnetic separation increased the silica content to 98. and reduced the iron content to 0.05%. owever, these hys-
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purity silica which can be applied as important raw materials for special purposes. The aim of our research is to improve low-grade silica from quartz sand by removing impurities especially …
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The silica used is natural sand provided from the region of Siliana in Tunisia. The mean grain size of raw μG is 350 μm (45mesh). The color of sand silica originates from selective absorption by incorporated impurities forming the so-called color centers (Flörke et al., 2008; Makreski et al., 2004; Lin et al., 2017; Wazamtu et al., 2013; Jallad and Espada-Jallad, 2008) …
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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 optimizing, …
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A process for leaching silica sand to reduce the iron content thereof comprises the steps of drying- preheating the sand; vigorously mixing the preheated sand in a suitable intensive mixer, e.g. a rotating pan mixer, with sufficient sulphuric acid (e.g. 7.5 kg H2SO4/tonne sand) to keep the surface of each grain of sand coated with a thin film of sulphuric acid during mixing; and …
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This low content coupled with a remarkable percentage in silica of 97.98 %.The tests by attrition and leaching with 40 % of sulphuric acid show, on the one hand, significant results with a high ...
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This low content coupled with a remarkable percentage in silica of 97.98 %.The tests by attrition and leaching with 40 % of sulphuric acid show, on the one hand, significant results with a high ...
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Table 2. Physical analysis of silica sand from mine tailings (MT). Property Silica Sand (MT) Moisture content (%) at 105 C Clay content (%) pH Grain shape Specific gravity Appearance (colour) 0.40 14.25 4.28 Subangular 2.50 Grey to light brown colouration. . Figure 2. Water treated silica sand from MT (Scale: 4.86 cm × 13.02 cm).
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If the mineral surface is already contaminated, different leaching methodologies have been used for removal of impurities. In the case of iron contaminated quartz, leaching with oxalic acid (Taxiarchou et al., 1997), oxalic acid and sulphuric acids (Veglio et al., 1998), phosphoric acid (Zhang et al., 2012), microbes (Groudev and Groudeva, 1986; Strasser et al, …
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The application of sulfuric acid (H 2 SO 4) disclosed the highest silica recovery of 99.85% with significant reduction in the amounts of undesirable impurities present in the silica …
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When silica sand is present in metallic materials, it could serve as a source of crevice corrosion on such metals. ... two acids were utilised, nitric (HNO 3) and sulphuric (H 2 SO 4) ... Dudeney, A.W.L.; Pilurzu, S. Glass sand processing by oxalic acid leaching and photo catalytic effluent treatment. Miner. Eng. 2001, 14, 639–646. [Google ...
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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.
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Semantic Scholar extracted view of "Drum leaching tests in iron removal from quartz using oxalic and sulphuric acids" by F. Vegliò et al. ... 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 to remove low iron content from the ...
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The iron content of silica is one of the most important characteristic which is used in glass industries. In this paper, possibility of decreasing the iron content (Fe 2 O 3) in dry high intensity magnetic separator (DHIMS) middle product were …
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The results of this research can be a very significant opportunity to increase the value added of quartz sand from Sukabumi, which can enhance the quality of lowgrade silica to provide better raw materials for glass industries Keywords: beneficiation, quartz sand, leaching, aluminum removal, iron removal, silica 3/6 ( 111 ) 2021 UDC 541 DOI: 10 ...
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The American silica sand concentrator uses sodium petroleum sulfonate and kerosene as collectors under acidic conditions to separate biotite and iron ore, which reduces the content of Fe2O3 from 0.12% to 0.18% to …
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This kind of reactor was used in order to test experimental conditions close to USA and UK silica-sand leaching practice. In this last case, sulphuric acid solutions are in general used in a rotatory drum reactor with an acid consumption of about 12 kg/t at about 100°C. Then, the objective is that of developing a commercially viable process ...
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Silica sand was obtained from Bangka island while quartzite rocks from Rokan Hulu, Riau. Both samples have good SiO2 value about 98% and increase up to 99.7% after leached with sulfuric acid in...
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The most commonly used inorganic acids are sulphuric [11] and hydrochloric [12], [13], but these are generally costly and the ensuing effluents are environmentally unacceptable. ... Removal of iron from silica sand by leaching with oxalic acid. Hydrometallurgy (1997) S. Ubaldini et al. Removal of iron from quartz sands: a study by column ...
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A process for leaching silica sand to reduce the iron content thereof comprises the steps of drying- preheating the sand; vigorously mixing the preheated sand in a suitable intensive mixer,...
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:vii" . ELSEVIER Hydrometallurgy 46 (1997) 215-227 hydrometallurgy Removal of iron from silica sand by leaching with oxalic acid M. Taxiarchou, D. Panias, I. Douni, I. Paspaliaris, A. Kontopoulos * Laboratory of Metallurgy, National Technical UniversiO' of Athens P.O. Box 64056, GR 157-10 Zogrqfos, Greece Received 6 December 1996; accepted 28 February 1997 …
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Leaching treatment is a proper route to extract the silica. Sulphuric acid (H 2 SO 4), hydrochloric acid (HCl) and nitric acid (HNO 3) solutions are conventionally used in leaching treatment to ...
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Resources, Conservation and Recycling, 2003. This work concerns a process for the recovery of silica gel from blast furnace slag. It consists of a leaching of the slag with H 2 SO 4, separation of gypsum, precipitation of silica gel from the …
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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, …
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This low content coupled with a remarkable percentage in silica of 97.98 %.The tests by attrition and leaching with 40 % of sulphuric acid show, on the one hand, significant results with a high ...
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The silicon solar grade destined for photovoltaic applications required a high purity (>99,9999%), its cycle of production consists firstly of enriching the silica by acid leaching. Algerian silica sand by means of sequential leaching process using several solvents like HF, HCl, H2SO4, NaOH.
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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 …
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M. Taxiarchou et al. / Hydrometallurgy 46 (1997) 215-227 Table 1 Chemical analysis of dry silica sand 217 Component %
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Control of silica polymerisation during ferromanganese slag sulphuric acid digestion and water leaching
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