1996
DOI: 10.1021/ie950427s
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Development of a Bleaching Process for a Kaolin of Industrial Interest by Oxalic, Ascorbic, and Sulfuric Acids:  Preliminary Study Using Statistical Methods of Experimental Design

Abstract: In the present work a preliminary study of iron removal from a yellow kaolin supplied by ECC International (Europe) Ltd. was performed using mainly oxalic and ascorbic acids in sulfuric acid solutions. The aim of the initial phase of research was to determine the effects of the main factors which can potentially influence the iron-removal process. Two-level fractional factorial experimentation was thus utilized to establish the main factors having an influence on the iron removal and to define a subsequent exp… Show more

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Cited by 39 publications
(21 citation statements)
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“…Extraction from low grade kaolin can be explained by a shrinking core model [15] in which: aA fluid + bB particle Product (2) If the reaction rate is controlled by diffusion through an inert product layer, the integrated rate equation is as follows [16]:…”
Section: Kinetic Analysismentioning
confidence: 99%
“…Extraction from low grade kaolin can be explained by a shrinking core model [15] in which: aA fluid + bB particle Product (2) If the reaction rate is controlled by diffusion through an inert product layer, the integrated rate equation is as follows [16]:…”
Section: Kinetic Analysismentioning
confidence: 99%
“…It forms different complexes with D2EHPA (H 2 A 2 ) such as Fe (OH)A 2 (HA) 2 and Fe(HA 2 ) 3 when it is extracted from aqueous phase having different acidities (Shuqiu and Chen, 1989).When iron is extracted from a highly acidic and loaded on the D2EHPA phase, its stripping from it is difficult even with concentrated H 2 SO 4 acid. In view of the previous difficulty, it is therefore desirable to examine the feasibility of using other reagents such as oxalic acid, which has been used on a large scale for the removal of iron stains from kaoline, quartz, and bauxite (Bonney, 1994;Ve g lio et al 1996;Ambikadevi and M. Lalithambika, 2000). The use of oxalic acid for removal of iron from alkyl pyrophosphoric acid has also been reported (Worthington and A. Magdics, 1984).…”
Section: Introductionmentioning
confidence: 99%
“…Consequently, several chemical methods have historically been applied to kaolin beneficiation in order to reduce these contaminants [2,[3][4][5].…”
Section: Introductionmentioning
confidence: 99%