Removal of Phosphorus from High Phosphorus Iron Ores in Wushan Mountain by Crosscurrent Acid Leaching

Abstract:

In the process of resource utilization of high phosphorus iron ores, phosphorus should be removed first. Compared to other dephosphorization methods, selective leaching with acid has special advantages such as high dephosphorization ratio, low iron loss and so on. However, a large amount of acidic wastewater containing phosphorus was produced after acid leaching. Therefore, the rational use of acidic wastewater and decrease of acid consumption is crucial to remove phosphorus by acid leaching. In this paper, the thermodynamics of the acid leaching was studied according to the existence form of mineral constituents in high phosphorus iron ores from Wushan Mountain. Then, crosscurrent acid leaching was employed to remove phosphorus from high phosphorus iron ores in Wushan Mountain and the changes in dephosphorization ratio, iron loss and acid concentration was observed during the leaching. The results showed that the phosphorus in Wushan iron ores could be removed selectively by acid leaching. After three-stage crosscurrent leaching, the dephosphorization ratio exceeded 74% and the iron loss was under 2.1%. Meanwhile, the acid concentration was decreased to 0.65mol/l in leaching solution, which could be returned to selective leaching after precipitation of phosphorus and supplement of hydrochloric acid.

• Periodical: Solid State Phenomena (Volume 279)
• Pages: 222-229
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.279.222
• Online since: August 2018
• Authors: Xiao Yan Xiang, Wen Tang Xia*, Xiao Li Yuan, Jian Guo Yin, Juan An
• Keywords: Circulation, Crosscurrent Acid Leaching, Dephosphorization, High Phosphorus Iron Ores, Thermodynamics

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