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 …

model, improving acid concentration and leaching temperature could promotes the removal of iron from coal-series kaolin. Keywords: coal-series kaolin, leaching kinetics, iron removal rate, oxalic acid 1. Introduction Considering the numerous usage in ceramics, paper, paints, fiberglass, inks, pharmaceuticals, and

In this work, hydrochloric acid is used to remove iron impurities in the bauxite ore contained in the diasporite mineral located in the Sari region. ... 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 ...

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 …

Oxalic acid, or oxalate, is a compound in many plant foods. ... Oxalate can combine with other minerals in the body to form compounds such as calcium oxalate and iron oxalate. ... removing rust ...

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 ...

Acid Strength: Strong vs. Weak Acids. Acid strength refers to the tendency of a specific acid to dissociate into a proton and an anion.Strong acids completely dissociate, and the chemical formula for this process is HA → H+ + A−.On the other hand, weak acids only partially dissociate, with the formula being HA ⇌ H+ + A−. In terms of rust removal, …

Experimental Method. In this study, the recovery of precious metals from bauxite ore was examined by a two-stage leaching process. The stages of this process were Stage I: Removing iron to a large extent and revealing the solubility conditions of titanium by treating the bauxite ore with oxalic acid, Stage II: Determining the recovery …

Abstract. Read online. The graphical representation of global stability for a system, or Pourbaix diagram, was constructed to perform a thermodynamic study of iron removal from kaolin using oxalic acid as an oxidant.

A = Oxalic acid (g/L) B = Time (h) C = Temperature (° C) As observed in experiment 9, the oxalic acid concentration is lowered to 86 g/L. Also, the conditions of time and temperature have been changed to 5.4 h and 84° C, respectively. These changes were very favorable in the removal result, since it increased to a 44%. Because this …

Experiments were performed for three different fractions of particle size (−300 + 150 μm and −75 + 45 μm) in a 0.5 M oxalic acid solution and stirring speed of 300 rpm.The effect of particle size was studied at 50 °C.As seen in Fig. 3, the leaching rate increases as kaolin particle size decreases.This can be attributed to the increase in …

The filamentous fungus Aspergillus niger can produce large amounts of organic acids (especially oxalic acid) which can be used for the removal of the iron …

The filamentous fungus Aspergillus niger can produce large amounts of organic acids (especially oxalic acid) which can be used for the removal of the iron …

It was constructed a thermodynamic stability diagram to study the behavior of the process of iron removal from kaolin by using oxalic acid, as mentioned previously. A set of species relevant to the process were selected employing reported studies in the literature about iron removal reactions with oxalic acid [3, 7-9, 16, 18, 19].

Maximum oxalic acid production occurs at a pH of 6 –7. But when the pH is lower, citric acid predominates [21,23]. The use of oxalic acid produced by the fungal to dissolve iron impurities from kaolin has been the subject of many studies. The important factors for iron removal from kaolin in microbiological tests are the pH,

In another process (Groudev, 1999), the iron contaminants leached from kaolin at about 90 °C by hydrochloric acids and lixiviant containing oxalic acid …

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.

Biological processes have also been evaluated, most recently by Mandal and Banerjee (2004) who presented their results of a study on the use of Aspergillus niger and their cultural filtrates for removing iron from a China clay. Using oxalic acid, the dissolved iron can be precipitated from the leach solution as ferrous oxalate, which can be ...

A leaching process by using oxalic acid to remove low iron content from the … Expand. 62. Save. Removal of iron from quartz sands: A study by column leaching using a complete factorial design. ... Factorial experiments in the development of a kaolin bleaching process using thiourea in sulphuric acid solutions.

In the present study, oxalic acid was used as a leaching reagent to remove iron from a kaolin mineral. Statistical analysis was conducted to determine the most influential factors in the ...

This study reports a leaching process along with a novel physical pretreatment technique to remove iron impurities from kaolin using oxalic acid. A …

Iron Leaching of a Mexican Clay of Industrial Interest by Oxalic Acid. Effect of concentration of oxalic acid on n iron removal in third simplex. Figure 2. … Cameselle, M. J. Núñez and J. M. Lema, "Leaching of Kaolin Iron … » More detailed REMOVAL OF Fe FROM KAOLIN BY CHEMICAL LEACHING …. REMOVAL OF Fe FROM KAOLIN BY …

relatively low. Iron is the main metal impurity in kaolin samples. Oxalic acid was used as the leaching agent due to the fact that it has been reported as the best for extracting iron from kaolin when

Oxalic acid in organic and raw form is non-lethal. But sometimes it can have harmful effects on the body as well. 4. Other Uses. So, in addition to using the chemical for bleaching, and removing rust and stain, oxalic acid is mostly used as a reducing element in developing photographic film.

In the present study, oxalic acid was used as a leaching reagent to remove iron from a kaolin mineral. Statistical analysis was conducted to determine the most influential factors in the ...

Results: The results showed significant removal of iron oxide using oxalic acid from 1.92 to 0.60 % for ferric oxide and 2.62 to 1.05 % for titanifferous oxide in Alkaleri and 3.45 to 1.17% for ...

A 3-gallon bucket or plastic container (or larger) will be used to contain the water and Oxalic Acid mix. Pro Tip: Do not use a metal container because the acid will react with it. Mix 1-pound of Oxalic acid with 3 gallons of water. If you want a stronger solution then go with 2 gallons per 1-pound of Oxalic acid.

The filamentous fungus Aspergillus niger can produce large amounts of organic acids (especially oxalic acid) which can be used for the removal of the iron contained as impurity in kaolin.

6 subsequently. The following is a brief history of kaolin bioleaching using different kinds of bacteria and fungi. 3.1. Fungi Fungi which are used in leaching processes must be able to excrete ...

The effect of different organic acids and their concentration in iron removal from kaolin ore has been reported by Saikia et al . Results indicate that the iron removal efficiency of …