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Kinetics of Boron Recovery from Boron-Rich Slag via Low-Temperature Soda Roasting
Jie Li1, Jinbiao Li2, Guolu Lv3
1School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China.
Abstract:
This study proposes an innovative process of low-temperature soda roasting followed by water leaching to extract boron and produce borax from boron-rich slag. To further enhance the leaching rate of boron, pretreatment of the boron-rich slag with the nucleating agent TiO2 was conducted. The effects of roasting temperature and Na2CO3 addition on the boron leaching rate, as well as the roasting kinetics of the TiO2-nucleated furnace-cooled slag, were investigated. The results indicate that at a roasting temperature of 700 °C for 150 min, the maximum boron leaching rate can reach 88.65%. The reaction of low-temperature soda roasting for TiO2-nucleated furnace-cooled slag to produce Na2B6O10 is controlled by interfacial chemical reaction, with an apparent activation energy of 88.677 kJ/mol.
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