鞍山式赤铁矿反浮选尾矿二次分选试验研究
发布时间：2018-10-10 12:49
【摘要】：鞍钢集团弓长岭选矿厂浮选车间入选矿石类型为鞍山式赤铁矿,其主要流程为弱磁-强磁-反浮选,混磁精矿反浮选后得到铁精矿产品。经“两粗-一精-三扫”反浮选作业后,反浮选尾矿的铁品位依然高达16%以上,尾矿中以细粒及微细粒的损失为主,作为短期内不可替代的矿产资源,损失和浪费严重。本文以弓长岭选矿厂反浮选尾矿为试验对象,进行铁矿物二次分选的试验研究。通过对入选原料的性质分析得出:原矿铁品位为16.65%,有用矿物主要有赤铁矿、磁铁矿等,脉石矿物以石英为主;原矿粒度组成适中但铁矿物分布不均,-38μm粒级产率34.02%、品位29.87%,金属分布率高达61.04%,可见对-38μm粒级中铁矿物的回收是提高试验铁回收率的关键。根据原矿性质分析并结合鞍山式赤铁矿的选别现状,初步拟定了“磁选富集-浮选提纯”的试验方案。在初步探索性试验的基础上,拟定了“磨矿-强磁-中磁”和“粗磨-强磁-细磨-中磁”两种磁选富集的方案,并对磨矿细度、磁场强度等对磁选效果有重要影响的参数进行了条件试验。综合考虑回收效果、运行成本等因素,磁选富集段选用一段磨矿流程,此时可得到回收率为81.05%,铁品位为41.71%的磁精矿,磁选尾矿品位仅4.66%。对磁精矿进行反浮选提纯作业,使用浮选机和浮选柱两种设备进行对比,确定了最佳的药剂用量、设备参数及各自的工艺流程。试验表明,在入浮品位为41.71%的情况下,经过浮选柱一粗一精一扫闭路作业,可得到品位为64.56%、浮选作业回收率为87.30%的铁精矿,比浮选机一粗两精两扫闭路作业得到的精矿品位和作业回收率分别高出0.52和1.12个百分点。实验室全流程数质量流程表明弓长岭选矿厂反浮选尾矿经“细磨-强磁-中磁-浮选柱一粗一精一扫反浮选”工艺,铁矿物得到有效回收。在二次分选原矿品位为16.65%的情况下,得到最终精矿品位为64.56%,全流程回收率达到70.76%,二次分选尾矿品位仅5.96%。由于半工业二次分选试验过程中出现强磁机堵塞现象,故将磁选富集段流程改为“弱磁-强磁”工艺。试验表明磨矿细度对二次分选系统效果有较大影响,因磁选流程及设备原因,半工业系统磁选尾矿品位远高于实验室试验中磁选尾矿品位。连续稳定试验结果表明,在原矿平均品位为17.94%条件下,经“磨矿分级-弱磁-强磁-浮选柱一粗一精一扫反浮选”流程后,得到品位为63.12%,全流程回收率为50.17%的最终精矿,全流程综合尾矿品位为10.43%。
[Abstract]:The ore type in flotation workshop of Gongchangling Concentrator of Angang Group is Anshan hematite, the main process is weak magnetic field, strong magnetic field reverse flotation, and iron concentrate product is obtained after reverse flotation of mixed magnetic concentrate. After the operation of "two coarse-one fine-three sweep" reverse flotation, the iron grade of tailings is still up to 16%. The loss of fine particles and fine particles is the main loss in tailings, which is an irreplaceable mineral resource in a short period of time. The loss and waste are serious. In this paper, the tailings of reverse flotation in Gongchangling Concentrator are taken as experimental objects, and the secondary separation of iron minerals is studied. By analyzing the properties of raw materials, it is concluded that the iron grade of raw ore is 16.65, the useful minerals are mainly hematite and magnetite, and the gangue minerals are mainly quartz; The ore size composition is moderate but the iron mineral distribution is uneven. The yield of -38 渭 m grain-grade is 34.02, the grade is 29.87 and the distribution rate of metal is as high as 61.04. It can be seen that the recovery of iron minerals in -38 渭 m grain-grade is the key to increase the recovery rate of tested iron. Based on the analysis of the properties of raw ore and the present situation of hematite separation in Anshan, the experimental scheme of "magnetic separation enrichment-flotation purification" was preliminarily drawn up. On the basis of preliminary exploratory test, two schemes of "grinding-strong magnetic-medium magnetic" and "coarse grinding-strong magnetic-fine grinding-medium magnetic" have been worked out, and the grinding fineness has been studied. The conditional tests were carried out on the parameters which have important influence on the magnetic separation effect, such as the magnetic field intensity. Considering the recovery effect, operation cost and other factors, the magnetic concentrate with recovery rate of 81.05%, iron grade of 41.71% and tailings grade of magnetic separation only 4.66 can be obtained by selecting one stage grinding process in the enrichment section of magnetic separation. The magnetic concentrate was purified by reverse flotation. The optimum dosage of the reagent, the parameters of the equipment and the respective technological process were determined by comparing the flotation machine with the flotation column. The results show that when the floatation grade is 41.71%, the iron concentrate with a grade of 64.56 and a recovery rate of 87.30% can be obtained by closed circuit operation. Compared with flotation machine, the concentrate grade and operation recovery are 0.52% and 1.12% higher than those obtained by closed circuit operation of one, two fine and two sweep flotation machines, respectively. The number and quality flow of laboratory whole process shows that iron minerals are recovered effectively by "fine grinding-strong magnetic-medium magnetic-flotation column-coarse-fine-sweep reverse flotation" process in reverse flotation tailings of Gongchangling Concentrator. When the grade of secondary separation is 16.65%, the final grade of concentrate is 64.56, the recovery rate of the whole process is 70.76, and the grade of secondary separation tailings is only 5.96. Due to the phenomenon of strong magnetic machine clogging in semi-industrial secondary separation test, the process of magnetic separation enrichment section is changed to "weak magnetic field and strong magnetic field" process. The results show that the grinding fineness has a great influence on the secondary separation system. Due to the process of magnetic separation and equipment, the tailings grade of the semi-industrial system is much higher than that of the magnetic separation tailings in laboratory tests. The results of continuous stability test show that under the condition of the average grade of raw ore being 17.94%, the final concentrate with a grade of 63.12 and a recovery rate of 50.17% is obtained by the process of "grinding classification, weak magnetic strength, strong magnetic flotation column, coarse, fine and reverse flotation". The comprehensive tailing grade of the whole process is 10.43.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD951
本文编号：2261827
[Abstract]:The ore type in flotation workshop of Gongchangling Concentrator of Angang Group is Anshan hematite, the main process is weak magnetic field, strong magnetic field reverse flotation, and iron concentrate product is obtained after reverse flotation of mixed magnetic concentrate. After the operation of "two coarse-one fine-three sweep" reverse flotation, the iron grade of tailings is still up to 16%. The loss of fine particles and fine particles is the main loss in tailings, which is an irreplaceable mineral resource in a short period of time. The loss and waste are serious. In this paper, the tailings of reverse flotation in Gongchangling Concentrator are taken as experimental objects, and the secondary separation of iron minerals is studied. By analyzing the properties of raw materials, it is concluded that the iron grade of raw ore is 16.65, the useful minerals are mainly hematite and magnetite, and the gangue minerals are mainly quartz; The ore size composition is moderate but the iron mineral distribution is uneven. The yield of -38 渭 m grain-grade is 34.02, the grade is 29.87 and the distribution rate of metal is as high as 61.04. It can be seen that the recovery of iron minerals in -38 渭 m grain-grade is the key to increase the recovery rate of tested iron. Based on the analysis of the properties of raw ore and the present situation of hematite separation in Anshan, the experimental scheme of "magnetic separation enrichment-flotation purification" was preliminarily drawn up. On the basis of preliminary exploratory test, two schemes of "grinding-strong magnetic-medium magnetic" and "coarse grinding-strong magnetic-fine grinding-medium magnetic" have been worked out, and the grinding fineness has been studied. The conditional tests were carried out on the parameters which have important influence on the magnetic separation effect, such as the magnetic field intensity. Considering the recovery effect, operation cost and other factors, the magnetic concentrate with recovery rate of 81.05%, iron grade of 41.71% and tailings grade of magnetic separation only 4.66 can be obtained by selecting one stage grinding process in the enrichment section of magnetic separation. The magnetic concentrate was purified by reverse flotation. The optimum dosage of the reagent, the parameters of the equipment and the respective technological process were determined by comparing the flotation machine with the flotation column. The results show that when the floatation grade is 41.71%, the iron concentrate with a grade of 64.56 and a recovery rate of 87.30% can be obtained by closed circuit operation. Compared with flotation machine, the concentrate grade and operation recovery are 0.52% and 1.12% higher than those obtained by closed circuit operation of one, two fine and two sweep flotation machines, respectively. The number and quality flow of laboratory whole process shows that iron minerals are recovered effectively by "fine grinding-strong magnetic-medium magnetic-flotation column-coarse-fine-sweep reverse flotation" process in reverse flotation tailings of Gongchangling Concentrator. When the grade of secondary separation is 16.65%, the final grade of concentrate is 64.56, the recovery rate of the whole process is 70.76, and the grade of secondary separation tailings is only 5.96. Due to the phenomenon of strong magnetic machine clogging in semi-industrial secondary separation test, the process of magnetic separation enrichment section is changed to "weak magnetic field and strong magnetic field" process. The results show that the grinding fineness has a great influence on the secondary separation system. Due to the process of magnetic separation and equipment, the tailings grade of the semi-industrial system is much higher than that of the magnetic separation tailings in laboratory tests. The results of continuous stability test show that under the condition of the average grade of raw ore being 17.94%, the final concentrate with a grade of 63.12 and a recovery rate of 50.17% is obtained by the process of "grinding classification, weak magnetic strength, strong magnetic flotation column, coarse, fine and reverse flotation". The comprehensive tailing grade of the whole process is 10.43.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD951
【引证文献】
相关会议论文 前1条
1 魏德洲;高淑玲;;铁矿石选矿技术进展[A];2008年全国金属矿山难选矿及低品位矿选矿新技术学术研讨与技术成果交流暨设备展示会论文集[C];2008年
，本文编号：2261827
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