Statistical Treatment of Bleaching Kaolin by Iron Removal

  • Román Ángel Hernández Hernández Universidad Autónoma del Estado de Hidalgo
  • Felipe Legorreta García Universidad Autónoma del Estado de Hidalgo
  • Leticia Esperanza Hernández Cruz Universidad Autónoma del Estado de Hidalgo
  • Antonia Martínez Luévanos Universidad Autónoma de Coahuila
Keywords: Kaolin mineral, dissolution of iron, oxalic acid, factorial design

Abstract

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 dissolution of iron from the kaolin mineral. Our goal was ferric iron solubilization and its reduction to ferrous iron to improve the iron removal in the acid medium. Leaching experiments were conducted at atmospheric pressure. A two-level factorial design of the type 24 was utilized. The dependent variable was the percentage of dissolved iron, and the dependent variables in this study were acid concentration (0.35 and 0.50 M), temperature (75 °C and 100 °C), leaching time (2 and 4 h), and pH (1.5 and 2.5). An analysis of variance revealed that the effects of the factors temperature (b), pH (d), and the combined effects of temperature and time (bc) resulted in the maximum dissolution of iron of 88% at 100 °C, giving a kaolin mineral with a whiteness index 93.50%.

Author Biographies

Román Ángel Hernández Hernández, Universidad Autónoma del Estado de Hidalgo
Área Académica de Ciencias de la Tierra y Materiales
Felipe Legorreta García, Universidad Autónoma del Estado de Hidalgo
Área Académica de Ciencias de la Tierra y Materiales
Leticia Esperanza Hernández Cruz, Universidad Autónoma del Estado de Hidalgo
Área Académica de Ciencias de la Tierra y Materiales
Published
10-12-2017