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  

Effect of Dephosphorizing Agent and Roasting Temperature on Grinding Characteristics of Reduction Production for High-phosphorus Oolitic Hematite Ore

作　　者：陈泽坤 孙体昌[1] 吴世超 李宗蔚 CHEN Zekun;SUN Tichang;WU Shichao;LI Zongwei(School of Civil and Resourse Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学土木与资源工程学院,北京100083

出　　处：《金属矿山》2021年第11期97-103,共7页Metal Mine

基　　金：国家自然科学基金项目(编号:51874017)。

摘　　要：为探究脱磷剂种类及用量、焙烧温度对高磷鲕状赤铁矿还原产物的磨矿特性的影响,以阿尔及利亚高磷鲕状赤铁矿为对象,采用筛分分析、化学分析及扫描电镜等手段研究还原产物可磨度、磨矿后铁和磷分布情况。结果表明:①还原产物磨矿产品颗粒粒度主要分布在+0.074 mm和-0.030 mm这2个粒级,-0.074+0.045 mm和-0.045+0.030 mm粒级含量较少。②随着脱磷剂用量的增加,还原产物的可磨度升高;不同种类的脱磷剂对还原产物可磨度的影响程度由大到小依次为CaCO_(3)+Na_(2)CO_(3)、CaCO_(3)、CaCO_(3)+CaF_(2)、CaF_(2)、Na_(2)CO_(3)。③不加脱磷剂时,+0.074 mm粒级磷主要存在于磷灰石以及部分铁中;加入CaCO_(3)、混合脱磷剂时,磷的分布较为集中,主要是以磷灰石的形式存在;加入Na_(2)CO_(3)时,磷的分布较为均匀,存在于脉石中与铁形成连生体;加入CaF_(2)后,磷的分布较为均匀,存在于脉石以及铁中,但脱磷的效果较差。④随着焙烧温度的升高,+0.074 mm粒级产率升高,其余粒级产率逐渐降低,还原产物的可磨度迅速降低;焙烧温度升高,+0.074 mm粒级铁品位和磷含量升高,铁和磷逐渐富集到粗粒级当中。In order to explore the effects of the types and dosage of dephosphorization agents and roasting temperature on the grinding characteristics of the reduction products of high-phosphorus oolitic hematite from Algeria,the grindability of the reduction products and the distribution of iron and phosphorus after grinding were studied by means of screening analysis,chemical analysis and scanning electron microscopy.The results showed that:①The particle size of the reduction products is mainly distributed in+0.074 mm and-0.030 mm,and the yield of-0.074+0.045 mm and-0.045+0.030 mm is small.②The grindability of the reduction product increased with the increase of the dosage of dephosphorization agents.The effects degree of different dephosphorization agents on the grindability of reduction products were CaCO_(3)+Na_(2)CO_(3),CaCO_(3),CaCO_(3)+CaF_(2),CaF_(2) and Na_(2)CO_(3) in descending order.③Phosphorus in the production above 0.074 mm mainly exists in apatite and part of iron without dephosphorization agents.The distribution of phosphorus is more concentrated,mainly in the form of apatite with CaCO_(3) or mixed dephosphorization agents.The distribution of phosphorus is more uniform and exists in gangue as aggregate with iron when Na_(2)CO_(3) is regarded as dephosphorization agent.The phosphorus is evenly distributed and exists in gangue and iron and the dephosphorization effect is poor with CaF_(2).④The yield of+0.074 mm grain increased,the other grain yield gradually decreased,and the grindability of the reduction product decreased rapidly with the increase of roasting temperature.The iron grade and phosphorus contents in+0.074 mm grain increased,and iron and phosphorus gradually enriched into coarse grain with the increase of roasting temperature.

关 键 词：高磷鲕状赤铁矿 还原焙烧 脱磷剂种类及用量 焙烧温度 铁、磷分布率 

分 类 号：TD925[矿业工程—选矿]