Comprehensive Utilization of Boron-Bearing Iron Concentrate Based on Carbon Composite Pellet Iron Nugget Technology

摘要

Boron compounds, chiefly borates, are commercially important and there are more than 300 end uses for borates. World consumption of borates was projected to reach 2.0 million metric tons of B_2O_3 by 2014, compared with 1.5 million metric tons of B_2O_3 in 2010. China makes an important contribution to the increasing of the total boron consumption in the world due to its large demand [1]. China has low grade boron resource. The traditional boron resource-szaibelyite ore of China is going to be exhausted with its grade becoming much lower. It is estimated that China will import about 1.5-2 million tons of boron minerals in 2020. Fortunately, there is 0.28 billion tons of low grade ludwigite deposit in Liaoning and Jilin province, which accounts for 57.88% boron reserve and 1% of the iron reserve in China, is the main alternate resource. It can't be directly utilized as any single kind of ore by traditional processing methods because of their low grades. The average boron and iron content of the ore is about 7.23 wt% and 30.65 wt%, respectively [2,3].