Boric Acid Production from a Low-Grade Boron Ore with Kinetic Considerations
- *Corresponding Author:
- Mahdi H
College of Engineering
University of Tehran
E-mail: [email protected]
Received Date: April 29, 2017; Accepted Date: May 17, 2017; Published Date: May 22, 2017
Citation: Mahdi H, Davood M, Mohsen V, Behzad S (2017) Boric Acid Production from a Low-Grade Boron Ore with Kinetic Considerations. Mod Chem appl 5:218. doi: 10.4172/2329-6798.1000218
Copyright: © 2017 Mahdi H. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
The most important Iranian boron reserves are in the basin of Ghezel Ozan, a river in the West and Northwest area of Zanjan. In the present study, boric acid production from an Iranian low-grade borate ore by hydrometallurgical process was investigated. In order to produce boric acid, boron ore was reacted with sulphuric acid. The influence of four parameters on the course of reaction such as pH, temperature, liquid to solid ratio, and reaction time was examined. Optimum condition for leaching part was obtained in temperature of 90°C, reaction time of 2 hours, L/S ratio of 3, and pH of 1. Under these conditions, the recovery of boron acidic leaching was reported to be 92.21%. Neutralization of pulp was done by lime. Finally, boric acid was obtained by crystallization. The purity of produced boric acid was 99.56%. The data obtained from the acidic leaching kinetics indicated that the dissolution of boron ore is fluid film diffusion controlled reaction and the reaction activation energy equals to 11.6 kJ/mol. Enthalpy of activation and entropy of activation were 11.2 kJ/mol and -246.3 J/(mol.K) respectively.