Kaolin clay, consisting mainly of the mineral kaolinite, is widely used as a white pigment. Its main uses include pigmented paper coatings, paints, fillers and extenders for paper, plastics, inks …
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201361· The goal of this research was to remove iron oxide from Ibute-Nze kaolin by dissolving the clay mineral in an aqueous oxalic acid solution and optimizing the process.
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201761· The reductive leaching of iron from kaolin with sodium hydrosulfite (Na 2 S 2 O 4) is efficient and is currently applied by the kaolin industry (Thurlow 2001). However, the utilization of hydrosulfites for bleaching kaolin must be performed under strong acidic conditions (pH < 3), leading to high operating costs and negative environmental impacts.
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220· Kaolin brightness (whiteness) is the main performance parameter affecting its value. High-quality Kaolin products are widely used for papermaking, skin care, pottery, ceramics, and gardening. To effectively improve Kaolin brightness, purification methods are adopted. The purification aims to remove colored impurities (iron, titanium, etc.) and sandy minerals (quartz, …
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200791· In this work bioleaching of iron from a highly contaminated kaolin sample was carried out using two different strains of Aspergillus niger, and the effects of strain type, pulp density, and time of clay addition on the iron removal were investigated by employing a 2 3 full factorial design.
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201361· The goal of this research was to remove iron oxide from Ibute-Nze kaolin by dissolving the clay mineral in an aqueous oxalic acid solution and optimizing the process.
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Bolonio, David. “Iron Removal from Kaolin Waste Dumps by Chemical (Oxalic and Citric Acids) and Biological (Bacillus Strain) Leaching.” Clays and Clay Minerals, Springer Science+Business Media, .
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2013121· The commercial value of kaolin raw materials is greatly affected by the presence and content of iron-bearing impurities, which can have a detrimental …
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202488· Magnetic separators remove iron from kaolin. Enhances the purity and quality of kaolin. Improves the brightness of the final product. Essential for high-quality kaolin production. Flotation Flotation removes non-kaolin particles, enhancing purity. Specific chemicals are added to create froth, which separates impurities.
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61· This study reports a leaching process along with a novel physical pretreatment technique to remove iron impurities from kaolin using oxalic acid. A detailed examination of the physical properties of the minerals confirmed that almost none of the leaching-resistant iron oxides, specifically hematite, was completely interlocked with the clay minerals. Accordingly, a …
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201041· This paper studied the effects of different carbon and nitrogen sources on the removal of iron impurities from kaolin using dissimilatory Fe (III)-reducing bacteria (DIRB). Iron impurities in the kaolin were removed using glucose, sucrose, food-sugar, maltose and soluble starch as different carbon sources with removal efficiencies in the order: monosaccharide > …
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510· The present study deals with chemical leaching tests conducted on Batn El-Ghoul kaolin clay deposit, south Jordan. Mineral identification and …
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2025210· In the present study, to investigate the effects of acidic leaching on the iron removal from kaolin clay supplied by Cam-Ser Madencilik A.S., the 24 full factorial design of experiments and
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928· For kaolin with high magazine content, low whiteness, and high content of sandy and iron minerals, it will adopt comprehensive methods such …
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200681· The use of chlorination for iron and titanium removal from different clay and kaolin minerals, used in Argentinian ceramic industry, has been investigated to establish reaction mechanisms, precautions and optimal conditions to bleach the clays.
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77· Kaolin waste dumps contain a huge volume of material that cannot be commercialized due to the presence of variable amounts of iron minerals, which impart a …
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200681· The use of chlorination for iron and titanium removal from different clay and kaolin minerals, used in Argentinian ceramic industry, has been investigated to establish reaction mechanisms, precautions and optimal conditions to bleach the clays.
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2025531· Kaolin, a versatile material, is widely utilized owing to its distinctive mineralogical characteristics, mineral morphology, and chemical and physical properties. Whiteness, a critical factor in determining the commercial value of kaolin, is significantly influenced by its impurities. Consequently, impurity removal from kaolin has emerged as a primary research focus. These …
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79· Characterization and beneficiation studies for the removal of iron from a china clay from India - Volume 48 Issue 5
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525· The way for us to remove iron in kaolin clay As we all know, whiteness is the main performance parameter of kaolin. The higher the whiteness, the greater the value of its use. Natural kaolin often affects its whiteness due to impurities.
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928· For kaolin with high magazine content, low whiteness, and high content of sandy and iron minerals, it will adopt comprehensive methods such as gravity separation (sand removal), strong magnetic separation, or high gradient magnetic separation (iron and titanium minerals removal), chemical bleaching, flotation, etc.
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201541· Application of mineral bio-beneficiation to remove iron oxyhydroxides from kaolinite clays has been the center of interest in recent decades, and many research works over the world have been dedicated to study the potential of this approach for upgrading the clay whiteness and refractoriness while preserving the inherent specifications and therefore …
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2002111· In this study, the removal of Fe (III) impurities from low-grade clay by a mixed iron-reducing culture is described. Factors such as inoculum density, carbon source affecting the removal efficiency of Fe (III) were also investigated. To evaluate the quality of kaolin before and after the microbial treatment to remove iron, the chromaticity of kaolin was compared after …
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The commercial value of kaolin raw materials is greatly affected by the presence and content of iron-bearing impurities, which can have a detrimental effect on the whiteness and refractoriness of manufactured products. Because of the high cost and environmental impact of techniques currently used to remove these impurities, some effort is now targeted toward the development …
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331· The goal of this research was to remove iron oxide from Ibute-Nze kaolin by dissolving the clay mineral in an aqueous oxalic acid solution and optimizing the process. The chemical composition of
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201541· Secondly, A. niger isolated from a pistachio shell was applied to remove iron impurities from an Iranian kaolin sample. In order to study the effects of initial pH, sucrose and spore concentration on oxalic and citric acid production, and consequently iron dissolution, response surface methodology based on a five-level, three-variable central
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