Existing forms of phosphorus in high phosphorus oolitic hematite and its dephosphorization mechanism
YANG Shuang-ping1, LIU Hai-jin1, WANG Miao1, LIU Qi-hang1, ZHANG Pan-hui2
1. College of Metallurgical Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, Shaanxi, China; 2. Xi'an Electric Furnace Research Institute Co., Ltd., Xi'an 710061, Shaanxi, China
Abstract：Based on difficulty in dephosphorization caused by the complex mineral structure of high phosphorus oolitic hematite, the morphology and micro dephosphorization process of phosphorus in the mineral reduction process were studied to achieve the purpose of deep dephosphorization. The high phosphorus oolitic hematite with the iron grade of 44.78% and the phosphorus mass percent of 0.92% was used in the experiment. From the surface scanning electron microscope and mineral phase structure diagram, it is known that the minerals were inlaid and formed oolitic structure layer by layer, with quartz, oolitic mud and hematite wrapping together, and phosphorus was concentrated and distributed in the fluorapatite inside the oolitic. The dephosphorization mechanism of high phosphorus oolitic hematite was studied based on the scanning electron microscope (SEM) and energy spectrum analysis (EDS). The results show that the oolitic structure is destroyed during the reduction process when the content of YM-1 dephosphorization agent is 16%, resulting in the gradually precipitated and aggregated from the oolitic of iron, separating of gangue from iron particles, and phosphorus removed in different forms. After magnetic separation, the tailings and iron are completely separated, and almost all phosphorus elements were found in the tailings. After adding composite dephosphorization agent YM-1 for calcined magnetic separation, the iron grade of the iron concentrate is 90.16%, the iron recovery is 91.25%, the mass percent of phosphorus is 0.056%, and the dephosphorization rate is 93.91%. The indexes of iron concentrate powder meet the requirements of industrial smelting.
杨双平, 刘海金, 王苗, 刘起航, 张攀辉. 高磷鲕状赤铁矿磷的存在形态及脱磷机理[J]. 钢铁, 2021, 56(10): 65-73.
YANG Shuang-ping, LIU Hai-jin, WANG Miao, LIU Qi-hang, ZHANG Pan-hui. Existing forms of phosphorus in high phosphorus oolitic hematite and its dephosphorization mechanism[J]. Iron and Steel, 2021, 56(10): 65-73.
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2021, Vol. 56 
