司家营铁矿磁铁矿与赤铁矿混合浮选交互影响研究

发布时间：2018-07-09 11:31

本文选题：磁铁矿 + 赤铁矿　；参考：《华北理工大学》2015年硕士论文

【摘要】：我国鞍山式贫赤铁矿储量大但嵌布粒度细,采用阴离子反浮选工艺微细粒级的铁矿物流失严重。以司家营矿铁矿石为研究对象,开展对磁铁矿和赤铁矿混合浮选中交互影响理论的研究,对提高微细粒赤铁矿资源的综合利用率具有一定的理论和实际指导意义。首先应用阴离子捕收剂GK-68和抑制剂淀粉对磁铁矿、赤铁矿、石英纯矿物和人工混合矿进行浮选分离试验。通过单矿物浮选试验发现,GK-68对磁铁矿的捕收性能要明显优于赤铁矿,淀粉对赤铁矿的抑制效果要明显优于磁铁矿;在CaO与淀粉的联合作用下,磁铁矿受淀粉抑制效果不好,浮选效果要比赤铁矿差。通过不同磁/赤比例的人工混合矿物浮选试验发现,浮选精矿铁品位与尾矿铁品位随着磁铁矿含量的增大而增高。在磁铁矿含量为51.41%的人工混合矿浮选试验中,单独添加淀粉,有一部分铁矿物随泡沫产品流失掉;在CaO与淀粉的联合作用下,磁铁矿与赤铁矿受抑制作用逐渐增强,精矿中铁矿物的含量逐渐增加。在上述试验的基础上,借助接触角、电动电位、吸附量以及红外光谱等多种现代表面测试技术对矿物间交互作用机理进行了探究。通过检测发现,在碱性介质中,捕收剂GK-68能使磁铁矿比赤铁矿更容易疏水上浮。GK-68在赤铁矿和磁铁矿表面的吸附均为化学吸附,并且在三种矿物表面的吸附程度大小关系为磁铁矿赤铁矿石英。淀粉与磁铁矿和赤铁矿的吸附均为化学吸附,还有氢键的作用,淀粉对三种矿物的抑制作用大小为赤铁矿磁铁矿石英。综合分析得出,在阴离子捕收剂GK-68浮选体系中,同赤铁矿相比,磁铁矿在GK-68较强的捕收作用以及淀粉较弱的抑制作用下,浮选性能较好,随尾矿流失严重,因此磁铁矿对赤铁矿的阴离子反浮选分离结果有很大影响。
[Abstract]:Anshan type poor hematite in China has large reserves but fine grain size, and the iron minerals of fine grain grade by anionic reverse flotation process are seriously lost. Taking Sijiaying iron ore as the research object, the research on the interaction theory of magnetite and hematite mixed flotation has certain theoretical and practical guiding significance for improving the comprehensive utilization ratio of fine hematite resources. Firstly, the flotation separation tests of magnetite, hematite, quartz pure mineral and artificial mixed ore were carried out by using anionic collector GK-68 and depressant starch. Through the flotation test of single mineral, it is found that GK-68 is superior to hematite in collecting property, starch is superior to magnetite in inhibiting hematite, and magnetite is not well inhibited by starch under the combined action of Cao and starch. Flotation is worse than hematite. It is found that the iron grade of flotation concentrate and the iron grade of tailings increase with the increase of magnetite content through the flotation experiments of artificial mixed minerals with different magnetic / red ratios. In the flotation experiment of artificial mixed ores containing 51.41% magnetite, some iron minerals were lost with foam products when starch was added alone, and the inhibition of magnetite and hematite gradually increased under the combined action of Cao and starch. The content of iron minerals in the concentrate increases gradually. On the basis of the above experiments, the mechanism of mineral interaction was investigated by means of contact angle, electric potential, adsorption capacity and infrared spectroscopy. It was found that the adsorption of magnetite on hematite and magnetite surface was chemisorbed by GK-68 in alkaline medium, and the adsorption of GK-68 on the surface of hematite and magnetite was easier than that of hematite. And the adsorption degree on the surface of the three minerals is magnetite hematite quartz. The adsorption of starch with magnetite and hematite is chemisorption and hydrogen bond. The inhibition effect of starch on the three minerals is hematite magnetite quartz. Comprehensive analysis shows that in the anionic collector GK-68 flotation system, compared with hematite, magnetite has a better flotation performance under the stronger collecting effect of GK-68 and the weaker inhibition of starch, and the flotation performance is serious with the loss of tailings. Therefore, magnetite has a great influence on the separation of hematite by anion reverse flotation.
【学位授予单位】：华北理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD951

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