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.

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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

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