难选高铁软锰矿流态化磁化焙烧-磁选浸出工艺  

Magnetic roastingvia fluidized bed and leaching procedure of refractory high-iron pyrolusite

作　　者：邵国强[1] 邹正[1] 朱庆山[1] SHAO Guoqiang;ZOU Zheng;ZHU Qingshan(Institute of Process Engineering,State Key Laboratory of Multiphase Complex Systems,Chinese Academy of Sciences,Beijing 100190,China)

机构地区：[1]中国科学院过程工程研究所,多相复杂系统国家重点实验室,北京100190

出　　处：《中国粉体技术》2024年第1期36-45,共10页China Powder Science and Technology

基　　金：国家自然科学基金项目,编号:22278404;中国科学院战略性先导科技专项(A类)项目,编号:XDA29040200。

摘　　要：【目的】提高难选高铁软锰矿的资源利用效率,缓解我国锰矿资源依赖进口的现状。【方法】采用流化床反应器作为焙烧装置,模拟发生炉煤气气体组分作为还原气体,对云南省某地区的难选高铁软锰矿进行流态化磁化焙烧。对还原后的焙烧矿进行磨矿-弱磁磁选,得到铁精矿和锰精矿。最后,对锰精矿中的锰进行酸浸浸出。【结果】在500℃流态化还原焙烧10 min,该难选高铁软锰矿即可达到最佳的还原状态效果,当样品的磨矿粒径<30μm的颗粒的质量分数为65%时,即可达到最佳的解离效果。选别后铁精矿铁品位和回收率分别为57.24%和76.55%,锰精矿锰品位和回收率分别为24.41%和73.84%,锰精矿的铁浸出率仅有1.94%。【结论】考察难选高铁软锰矿流态化磁化焙烧-磁选浸出规律,可以降低反应温度,缩短反应时间,低碳节能;抑制过还原反应的发生,可以提高铁资源利用率,降低浸出酸耗和除铁剂消耗。低能耗、低消耗和高利用率可以极大地提高难选高铁软锰矿的经济性,解决这部分资源难于利用的困境。Objective The supply of manganese ore in China is heavily dependent on imports with its relatively deficient manganese ore resources but large demands.However,a large number of refractory high-iron pyrolusite has not been effectively utilized.Low-temperature reduction can thermodynamically inhibit the generation of faujasite and ferromanganese spinel phases,solving the problem of over-reduction of high iron soft manganese ores from the source.In order to improve the resource utilization efficiency of refractory high-iron pyrolusites,the fluidized magnetic roasting was carried out for the refractory high-iron pyrolusite from Yunnan.We hope that the methods and results of our research can help to the utilization of such resources.Methods In this paper,Firstly,the raw ore particles with a particle size of 56-250μm were dried and dehydrated for 24 h at 105 C.After that,the pretreated particles were put into a fluidized bed reactor for the reduction reaction.Then,the roasted ore was ground and magnetically separated to obtain iron concentrate and manganese concentrate(tailings).The iron grade and man-ganese grade were analyzed by chemical titration to calculate the iron recovery rate and manganese recovery rate.Finlly,the leaching experiment of manganese concentrate was carried out to calculate the manganese leaching rate and iron leaching rate.Results and Discussion The results show that this procedure can lower the reaction temperature below the thermodynamic temper-ature of the over-reduction reaction,and the iron leaching rate of the manganese concentrate is only 1.94%.After magnetic sepa-ration,the iron grade of the concentrate is 57.24%,with a recovery rate of 76.55%,while the manganese grade of the tailing is 24.41%with a recovery rate of 73.84%.Conclusion The Yunnan high-iron pyrolusite used in the experiment is a case of refractory high-iron pyrolusite in China.The iron and manganese particles are associated,and the embedded particle size falls within the range of 15 to 40μm.The manganese-iron ratio of the

关 键 词：高铁软锰矿 流态化 磁化焙烧 锰精矿 铁精矿 

分 类 号：TD792[矿业工程—矿井通风与安全] TB4[一般工业技术]