Properties of boron-rich slag separated from boron-bearing iron concentrate

• Published in: Journal of Central South University 2018-04, Vol.25 (4), p.783-794
• Main Authors: Wang, Guang, Wang, Jing-song, Xue, Qing-guo
• Format: Article
• Language: English
• Subjects: Boron; Boron oxides; Concentrates (ores); Cooling rate; Crystal structure; Crystallinity; Crystallization; Engineering; Hydrometallurgy; Iron; Melting; Metallic Materials; Silicon dioxide; Smelting; Viscosity
• ISSN: 2095-2899; 2227-5223
• DOI: 10.1007/s11771-018-3783-y

In the present paper, the fundamental research on the properties of boron-rich slag melting separated from boron-bearing iron concentrate was performed. The melting and fluidity of B 2 O 3 -MgO-SiO 2 -FeO slag system, crystallization of separated boron-rich slag and factors on the extraction efficiency of boron-rich slag were systematically investigated. B 2 O 3 content would heavily affect the melting and fluidity property of boron-rich slag. Generally, FeO could improve the melting and fluidity property of boron-rich slag. Boron-containing crystalline phase mainly precipitated in temperature range from 1200 °C to 1100 °C. Higher smelting temperature and B2O3 reduction ratio were negative for the extraction of boron. The cooling rate of 10–20 °C/min was better for the crystallization of boron-containing crystalline phase. Based on the obtained experimental results, the optimum operating parameters for the development of pyrometallurgical boron and iron separation process and further boron-rich slag cooling process were proposed.