1999
DOI: 10.1021/ie990156b
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Iron Removal Process for High-Purity Silica Sands Production by Oxalic Acid Leaching

Abstract: 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 ore under study and to obtain a material suitable for fiber optic production has been evaluated. A characterization study has been carried out to establish the location of the iron impurities on the ore:  77 g/t was the maximum iron contamination, whereas, a final iron content <10 g/t (as Fe) has to be achieved for … Show more

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Cited by 63 publications
(30 citation statements)
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“…In addition, there are recorded efforts to improve iron removal from silica by using Cyclojet or pneumatic flotation cells [15,16]. The last step for iron removal from silica is leaching, and many works have been conducted to investigate iron removal from silica [17][18][19][20][21]. It should be mentioned that some efforts were made to remove iron from relatively low grade silica using different reagents (H 2 SO 4 , HCl, and oxalic acid) in leaching experiments [1,6,22,23].…”
Section: Enrichment Of Silica Used In the Glass Industrymentioning
confidence: 99%
“…In addition, there are recorded efforts to improve iron removal from silica by using Cyclojet or pneumatic flotation cells [15,16]. The last step for iron removal from silica is leaching, and many works have been conducted to investigate iron removal from silica [17][18][19][20][21]. It should be mentioned that some efforts were made to remove iron from relatively low grade silica using different reagents (H 2 SO 4 , HCl, and oxalic acid) in leaching experiments [1,6,22,23].…”
Section: Enrichment Of Silica Used In the Glass Industrymentioning
confidence: 99%
“…For a particular source of silica sand to be suitable for glass making, it must not only contain a very high proportion of silica but also should not contain more than strictly limited amounts of certain metallic elements [11]. Presence of iron in silica sand makes the resulting glass to be coloured and the iron level is consequently the most critical parameter in determining whether particular sand is good for making clear or coloured glass [36].…”
Section: Introductionmentioning
confidence: 99%
“…These activities have initiated studies directed towards utilization of this acid in hydrometallurgy for improvement of clays, kaolins, quartz and silica sands through dissolution of iron mineral impurities [5][6][7][8][9][10][11]. Remediation of metal-contaminated soils with oxalic acid producing fungi has also been contemplated [12].…”
Section: Introductionmentioning
confidence: 99%