CaO和Na2CO3用量对高磷鲕状赤铁矿石深度还原分选的影响

金属矿山 ›› 2019, Vol. 48 ›› Issue (02): 54-59.

CaO和Na₂CO₃用量对高磷鲕状赤铁矿石深度还原分选的影响

栗艳锋^1,2，韩跃新^1,2，孙永升^1,2，张琦^1,2

1. 东北大学资源与土木工程学院，辽宁沈阳 110819；2. 难采选铁矿资源高效开发利用技术国家地方联合工程研究中心，辽宁沈阳 110819

出版日期:2019-02-25 发布日期:2019-04-08
基金资助:
基金项目：国家自然科学基金项目（编号：51604063）。

Effects of CaO and Na2CO₃ Dosage on Beneficiation during Coal-based Reduction of High-phosphorus Oolitic Hematite Ore

Li Yanfeng^1,2， Han Yuexin^1,2， Sun Yongsheng^1,2， Zhang Qi^1,2

1. School of Resources and Civil Engineering, Northeastern University, Shenyang 110819， China；2. National-Local Joint Engineering Research Center of Refractory Iron Ore Resources Efficient Utilization Technology，Shenyang 110819，China

Online:2019-02-25 Published:2019-04-08

摘要/Abstract

摘要： 采用深度还原技术处理高磷鲕状赤铁矿可以取得良好的技术经济指标，但添加剂（如CaO和Na₂CO₃）在深度还原过程中的作用仍需深入研究。以鄂西某宁乡式高磷鲕状赤铁矿石为原料，考察还原温度、还原时间、碳氧摩尔比对还原指标的影响。结果表明，适宜的深度还原条件为还原温度1 523 K、还原时间30 min、碳氧摩尔比2.0，获得的还原物料铁金属化率为86.21%，还原物料经磁选获得的磁选精矿铁品位为91.69%、回收率为92.23%。在最佳还原条件下分别以CaO和Na₂CO₃为添加剂进行深度还原试验，采用化学成分分析和X射线衍射（XRD）探究了CaO和Na₂CO₃用量对高磷鲕状赤铁矿石深度还原分选指标、脱磷效果和物相转变的影响。结果表明，添加CaO和Na₂CO₃均可抑制深度还原过程中铁橄榄石的生成，有效降低精矿中磷含量，提高铁回收率；CaO可与物料中的SiO2和Al2O3反应生成硅灰石和钙铝黄长石等高熔点硅酸盐，不利于铁品位的提高；Na₂CO₃可与物料中的SiO₂和Al₂O₃反应生成钠长石等低熔点硅酸盐，有利于铁品位的提高。

关键词: 高磷鲕状赤铁矿, 深度还原, 添加剂, CaO, Na₂CO₃ 物相变化, 脱磷

Abstract: High-phosphorus oolitic hematite treated with coal-based reduction technology can have good technical-economic indicators， but the role of additives such as CaO and Na₂CO₃ in the reduction process still needs to be further studied. The influence of reduction temperature， reduction time， mole ratio of C to O on reduction index was investigated， taking high-phosphorus oolitic hematite from Western Hubei as research object. The results showed that the appropriate reduction conditions were the reduction temperature of 1523K， the reduction time of 30 min and mole ratio of C to O is 2.0， the metallization degree of the reduced products was 86.21%， the iron grade of magnetic separation was 91.69%， and the recovery was 92.23%. The effects of CaO and Na₂CO₃ dosage on separation indexes was investigated on the optimum coal-based reduction conditions， the chemical composition analysis and X-ray diffraction （XRD） were used to investigate dosage of CaO and Na₂CO₃ on separation index of high-phosphate oolitic hematite， dephosphorization and phase transition. The addition of CaO and Na2CO3 can inhibit the formation of fayalite in reduction process， effectively reduce the phosphorus content in concentrate and improve the iron recovery. CaO can react with SiO₂ and Al₂O₃ in the samples to form high-melting-point silicates such as wollastonite and gehlenite， which is not conducive to the improvement of iron grade. Na2CO3 can react with SiO₂ and Al₂O₃ in the samples to form low-melting-point silicate such as albite， which is conducive to the improvement of iron grade.

Key words: High-phosphorus oolitic hematite, Coal-based reduction, Additive, CaO, Na₂CO₃, Phrase changes, Dephosphorization

栗艳锋, 韩跃新, 孙永升, 张琦. CaO和Na₂CO₃用量对高磷鲕状赤铁矿石深度还原分选的影响[J]. 金属矿山, 2019, 48(02): 54-59.

LI Yan-Feng, HAN Yue-Xin, SUN Yong-Sheng, ZHANG Qi. Effects of CaO and Na2CO₃ Dosage on Beneficiation during Coal-based Reduction of High-phosphorus Oolitic Hematite Ore[J]. Metal Mine, 2019, 48(02): 54-59.

[1]	赵振兴, 白丽梅, 王美佳, 田益琳, 程子朦. 添加剂对六水氯化镁制备氧化镁及氧化镁水化产物的影响[J]. 金属矿山, 2024, 53(7): 255-.
[2]	连宵宵, 孙体昌, 寇珏, 郭晓霜. 高磷鲕状赤铁矿还原焙烧中脱磷剂CaCO3作用影响因素研究[J]. 金属矿山, 2023, 52(03): 120-126.
[3]	迟晓鹏, 张瑞莹, 翁威, 衷水平. 添加剂在电解锰中的应用及展望[J]. 金属矿山, 2023, 52(02): 77-84.
[4]	贺腾, 罗果萍, 张婧, 张国成, 纪祥辉. SiC 还原磷灰石气化脱磷的热力学机理研究[J]. 金属矿山, 2022, 51(08): 131-137.
[5]	李恩硕, 胡晨光, 苏航, 付佳伟. 钢渣中非稳定性物质微观结构和性能的研究现状与展望[J]. 金属矿山, 2022, 51(07): 250-258.
[6]	孔祥艳, 赵冰, 李艳军, 孙永升. 铜冶炼渣中铁的生物炭深度还原—磁选回收试验[J]. 金属矿山, 2022, 51(05): 110-116.
[7]	韦东, 郭泽, 张鹏飞, 路漫漫, 张汉泉. 鄂西某高磷鲕状赤铁矿煤基磁化焙烧—磁选试验研究[J]. 金属矿山, 2022, 51(04): 90-95.
[8]	郑金, 王洪凯李斌川, 陈建设, 刘奎仁, 韩庆, . 辽宁某氰化尾渣中铁、铅综合回收试验研究[J]. 金属矿山, 2021, 50(11): 115-120.
[9]	张凯丁亚卓. 某钒钛磁铁矿精矿深度还原铁颗粒长大特性研究[J]. 金属矿山, 2021, 50(11): 110-114.
[10]	陈泽坤孙体昌吴世超李宗蔚. 脱磷剂及焙烧温度对高磷鲕状赤铁矿石还原产物磨矿特性的影响[J]. 金属矿山, 2021, 50(11): 97-103.
[11]	王英硕 , 黄武胜 , 刘伟然 , 延黎 , 吴世超 , 孙体昌 . 回转窑直接还原工艺处理国外某高磷鲕状赤铁矿的工业试验[J]. 金属矿山, 2021, 50(04): 106-112.
[12]	吴世超 , 孙体昌 , 李正要, 徐承焱, 李小辉. 高磷铁矿石直接还原—磁选研究进展[J]. 金属矿山, 2021, 50(02): 58-64.
[13]	吴世超, 孙体昌, 杨慧芬. 国外某高磷鲕状赤铁矿直接还原—磁选降磷研究[J]. 金属矿山, 2019, 48(11): 109-114.
[14]	王强, 曲涛, 施磊, 杨斌, 戴永年. CaF₂对褐铁矿型红土镍矿真空焙烧及碳热还原的影响[J]. 金属矿山, 2019, 48(04): 76-81.
[15]	杨鑫龙, 冯雅丽, 李浩然. Na₂CO₃促进某硅质页岩中低价钒的钠化氧化作用研究[J]. 金属矿山, 2019, 48(03): 105-110.

扫码分享

CaO和Na₂CO₃用量对高磷鲕状赤铁矿石深度还原分选的影响

Effects of CaO and Na2CO₃ Dosage on Beneficiation during Coal-based Reduction of High-phosphorus Oolitic Hematite Ore

PDF (PC)

可视化

摘要/Abstract

引用本文

使用本文

参考文献

相关文章 15

编辑推荐

Metrics

本文评价

扫码分享