Recovery and reutilization of high-quality boron carbide from sapphire wafer grinding-waste.

Author(s) Li, X.; Gao, S.; Xing, P.; Dong, K.; Gao, B.; Feng, Z.
Journal J Environ Manage
Date Published 2018 Oct 15

Considerable amounts of high-quality boron carbide (BC) are discarded as J240 sapphire-wafer grinding waste (J240-W), which can be mostly recovered and reutilized after purification for environmental protection. This paper has developed a feasibility method that simultaneously removes the alumina (AlO) and iron (Fe) impurities from J240-W with microwave-assisted acid leaching strategy. The influence factors on the AlO leaching ratio, such as leaching temperature, sulfuric acid concentration, liquid-solid ratio and time, have been investigated and optimized. For comparison, the leaching of AlO with conventional and ultrasound-assisted methods has also been performed. The result indicates that the AlO leaching ratio at 80 °C with microwave assistance is 68.95%, much higher than that of conventional (23.66%) and ultrasound (53.13%) methods. Attributed to the unique heating mode of microwave, the AlO leaching ratio can rise to 95.28% at optimum condition, while the content of purified BC can reach to 98.22% with the residual AlO and Fe fall to 0.26% and 0.12%, respectively. The recovered BC with high purity and suitable particle size can be reutilized to manufacture W5 abrasive and W0.5 armor material, which is beneficial for environmental protection and resources reutilization.

DOI 10.1016/j.jenvman.2018.06.088
ISSN 1095-8630
Citation J Environ Manage. 2018;224:106112.

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