云南某高磷铁矿直接还原同步脱磷试验研究.docVIP

云南某高磷铁矿直接还原同步脱磷试验研究 （北京矿冶研究总院，北京102628；矿物加工科学与技术国家重点实验室，北京102628） 摘要：云南某铁矿属于高磷含有多种铁矿物的铁矿石，铁的品位为36.94%，磷的品位为0.93%。针对矿石中磷含量高铁矿物种类多的特点研究制定了直接还原焙烧同步脱磷工艺在无烟煤用量为40 kg/t脱磷剂HJ用量为200 kg/t焙烧温度为1150℃焙烧时间为40焙烧砂一段磨矿细度为-0.074 mm占75%一段磁场强度为95.5 KA/m二段磨矿细度-0.043 mm占80%二段磁场强度为67.67 kA/m的条件下，可获得铁品位为91.12%回收率为90.05%磷品位为0.14%的高铁。 Study of Direct Reduction and Synchronous Dephosphorization for High-phosphorus Hematite from Yunnan Xiao Wanqin (1.State Key Laboratory of Mineral Processing，Beijing 102628,China;2.Beijing General Research Institute of Mining and Metallurgy,Beijing 102628,China) ABSTRACT:The iron ore in Yunnna contains various iron minerals with higher phosphorus. The grade of Fe was 36.94%, and the grade of P was 0.93%. Aimed at the features of high content of phosphorus and various types of iron minerals, the technology of direct reduction roasting with dephosphorization synchronously was formulated. The iron concentrate with the Fe grade of 91.12% and Fe recovery of 90.05% with the P grade of 0.14% can be obtained under the conditions as following: anthracitic dosage was 40 kg/t, dosage of dephosphorizing reagent HJ was 200 kg/t, calcination temperature was 1150℃, calcination time was 40 min, the primary grinding fineness was 75% -0.074mm, first–staged magnetic field intensity was 95.5 KA/m, secondary grinding fineness was 80% -0.043mm, and second-staged magnetic field intensity was 67.67 kA/m. KEY WORDS: hematite limonite siderite direct reduction roasting dephosphorization 我国优质铁矿资源匮乏、复杂难选铁矿石利用率低以及国内铁矿石生产企业产能不足，致使国内铁矿石市场供不应求状态。国内多数大型钢铁企业不得不高价购买澳大利亚、巴西、印度等铁矿石。 本试验针对云南某铁矿开展选矿工艺研究，目标是获得高品位、高回收率、低杂质的精矿产品，为该矿石的开发利用提供技术参考。 1 试验原料 1.1 矿样 含有多种铁矿物的矿石主要呈嵌布呈鲕粒核心与赤铁矿紧密共生，原矿开展了多元素分析结果见表1铁磷的化学物相分析结果见表2和表3。 表1 原矿主要化学成分分析结果 components of raw ore 化学成分 Fe Mn V Cr SiO2 Al2O3 TiO2 含 量/% 36.94 0.43 0.048 0.012 14.65 6.20 0.18 化学成分 CaO MgO P S Na2O K2O 烧失 含 量/% 3.32 2.29 0.93 0.47 0.052 0.12 19.25 表2 原矿中铁的化学物相分析结果 相别 赤铁矿 褐铁矿 磁性铁 碳酸铁 硫化铁 硅酸铁 总量 铁含量/% 10.53 6.16 0.07 16.47 0.32 3.