干法煅烧改性中低品位磷矿石  

Modified Medium-Low Grade Phosphate Ores by Dry Calcination

作　　者：丁蕾蕾 郜华萍[1] 万欣 黄信达 王六生[2] 严建华 郜烨[4] Ding Leilei;Gao Huaping;Wan Xin;Huang Xinda;Wang Liusheng;Yan Jianhua;Gao Ye(Faculty of Environment Science and Engineering,Kunming University of Science and Technology,Kunming,Yunnan 650500;Yunnan Jianglin Group Co.,Ltd.,Yuxi,Yunnan 652600;State Key Laboratory of Clean Energy Utilization,Institute for Thermal Power Engineering,Zhejiang University,Hangzhou,Zhejiang 310027;Jackson State University,Jackson,Mississippi 39217,USA)

机构地区：[1]昆明理工大学环境科学与工程学院,云南昆明650500 [2]云南江磷集团股份有限公司,云南玉溪652600 [3]浙江大学热能工程研究所,能源清洁利用国家重点实验室,浙江杭州310027 [4]美国杰克逊州立大学,美国密西西比州杰克逊市39217

出　　处：《非金属矿》2020年第1期59-63,共5页Non-Metallic Mines

基　　金：云南省重点研发计划项目(2018IB026);昆明理工大学分析测试基金资助项目(2018M20172207017)

摘　　要：研究磷矿石品位提升的煅烧条件,分析中低品位磷矿石不同条件下的热分解产物,提出其中碳酸盐热分解机理,为中低品位磷矿石利用提供理论依据。结果表明:Ca^2+、Mg^2+以碳酸盐形式大量存在于中低品位磷矿石中,总质量分数约40%,在900 ℃下煅烧粒径为40~60 mm的中低品位磷矿石30 min,可以将90%以上的碳酸盐分解为CaCO3、MgO、CaO和CO2,使磷矿石w(CO2)<6%,w(P2O5)>29%,得到一等品磷矿石,可以满足磷矿石加工要求以用于生产。The calcination conditions for the upgrading of phosphate ores grade was studied.The thermal decomposition products of medium-low grade phosphate ores under different conditions was analyzed.The mechanism of carbonate thermal decomposition in phosphate rock is proved.All of the above provide theoretical basis for the utilization of medium-low grade phosphate ores.The results indicated that calcium and magnesium ions are abundant in the form of carbonate in medium-low grade phosphate ores and the total mass fraction of calcium and magnesium is about 40% by X-Ray Fluorescence.It is found that more than 90% of carbonates can be decomposed by calcining the phosphate ores with particle sizes of 40-60 mm,at 900 ℃ for 30 min.The mass fraction of CO2<6% and the mass fraction of P2O5>29% of phosphate ores,indicated that the first-class phosphate ores are obtained,which can be applied to the practical production of phosphorus-related products.

关 键 词：中低品位磷矿石 碳酸盐 热分解 品位提升 

分 类 号：TF046.2[冶金工程—冶金物理化学]