Distribution of REE of Phosphate Concentrate in Wet-Phosphoric Acid Process
There exists the most important REE-bearing phosphorite deposit in Southwest of China. Due to the fact that the REE are present in the form of ions in the lattices of collophanite or carbonatfluorapatite, the REE can be enriched in phosphate concentrate by flotation method. The phosphate concentrate is the main raw materials to produce phosphoric acid, therefore, it is significant to further investigate the distribution rule of REE in wet process. In this paper, the single leaching and recycled leaching technology were carried out to investigate the effect of various parameter conditions on distribution of REE in products. The REE compositions of products were analyzed by Inductively Coupled Plasma Emission Mass Spectrometry (ICP-MS) method. It was found that the acidic value of leaching liquor was the main effect factor on the distribution of REE in products. In single leaching stage, P<,2>O<,5> concentration of leaching liquor slightly varied from 8％ to about 10％ when the excessive coefficient of sulphuric acid ranged from 1.03 to 1.05, and the distribution proportions of ΣREO in phosphoric acid solution was lower than 40％. However, in recycled leaching process (the condition similar to practical wet process), with an increase of P<,2>O<,5> concentration as well as the acidic value of leaching liquor, the distribution proportions of ΣREO in phosphoric acid solution could be decreased to 2.56％. That is to say that under the condition similar to practical wet process, more than 90％ of REE of phosphate concentrate became precipitation entering into the phosphogypsum product. This investigation will provide valid reference for reasonably recovering or reserving REE in wet- phosphoric acid process.
wet-phosphoric acid process distribution of REE single leaching recycled leaching rare earths
Jin Huixin(金会心) Li Junqi(李军旗) Wang Hua(王华) Mao Xiaohao(毛小浩)
Faculty of Materials and Metallurgical Engineering, Kunming University of Science and Technology, Ku Materials and Metallurgy Engineering College, Guizhou University, Guiyang 550003, China Faculty of Materials and Metallurgical Engineering, Kunming University of Science and Technology, Ku
国际会议
第五届国际稀土开发与应用研讨会(The Fifth International Conference on Rare Earth Decelopment and Applicatin)
包头
英文
78-84
2007-08-07（万方平台首次上网日期，不代表论文的发表时间）