昆钢大红山铁精矿提质及尾矿降铁选矿技术开发
发布时间：2018-08-30 16:44
【摘要】：随着我国钢铁行业的快速发展,国内对铁矿石的需求越来越大,而进口铁矿石价格居高不下,严重制约了钢铁产业的健康发展。加强我国铁矿石的开发利用,对钢铁产业的可持续发展具有重要作用。玉溪大红山矿业有限公司开发的铁矿矿产资源丰富,地质储量4.6亿吨铁矿石,平均地质品位36%,是昆明钢铁集团有限责任公司的主要铁矿石原料基地。大红山铁矿属于典型的古海相火山岩型铁矿,矿体赋存条件复杂多样,矿石性质复杂,铁矿物主要以微细粒的赤铁矿及磁铁矿为主,脉石矿物主要是硅酸盐和石英类矿物,含铁矿物嵌布粒度细,使金属铁的分选、提质和冶炼综合回收利用带来极大的困难。经过近十年的开采,矿石性质发生了很大变化,原矿铁品位下降到35%左右,随着生产的进行,易选的磁铁矿含量降低,难选的硅酸铁矿物含量增加,矿石分离与富集难度明显增大,2008年以前,大红山铁矿选矿总尾矿含铁品位高达14%～15%,损失在尾矿中的铁金属量巨大；同时,铁精矿中硅含量达到9%以上,造成后续冶炼成本的剧增。为了解决上述问题,实现矿产资源的综合利用,从选矿技术改进和尾矿综合利用两个方面着手,进行了二段强磁精矿的提质降硅试验研究、二段强磁尾矿降尾试验研究、一段强磁尾矿降尾试验研究和总尾矿继续降尾的试验研究。试验结果表明：(1)离心机对二段强磁精矿提质降硅有较好的效果。当给矿浓度在18%～26%之间时,品位为51%～55%的原矿通过离心机分选,可得到产率为57%～64%、回收率为71%～78%、品位高达64%～66%、SiO2含量降至4%左右的精矿。(2)二段强磁尾矿降铁采用强磁-离心机-摇床联合流程方案,可将二段强磁尾矿品位由26%～28%降至12.53%。(3)一段强磁尾矿降铁采用一粗一精一扫磁-重联合流程方案,可获得品位、产率分别为42.32%、37.72%的铁精矿,尾矿品位降低到6.46%。(4)总尾矿的降铁采用强磁-重选选别流程方案,可获得品位、回收率分别为53.11%、23.37%的铁精矿,尾矿品位降至9.21%。总体来说,大红山正是通过以上试验研究与应用,走上了铁矿资源的高效综合利用之路,生产规模及产品收入不断扩大,创造了大红山80%以上的经济效益,奠定了大红山矿未来发展的基础,对于国内复杂难采、选铁矿资源高效利用,降低能耗、减少尾矿排放量、保护环境提供了十分重要的示范作用。针对高硅酸盐的与脉石物理化学性质相当、复杂结构的贫、细、杂难选赤、褐铁矿,首次创新应用了强磁-振动螺溜-摇床-离心机重选的磁-重联合流程,适应贫、细、杂高硅酸盐难选矿的分选。通过试验研究,使尾矿品位从初期的15.34%降低到10.53%,每年可从尾矿中回收铁精矿100万t；同时,铁精矿硅含量从9%降至6.04%。论文通过试验研究,达到了提高精矿品位降低硅含量,同时,降低尾矿中铁含量的目标,实现矿产资源的综合利用。
[Abstract]:With the rapid development of China's iron and steel industry, the domestic demand for iron ore is increasing, while the high price of imported iron ore seriously restricts the healthy development of iron and steel industry. Strengthening the development and utilization of iron ore in China plays an important role in the sustainable development of iron and steel industry. Yuxi Dahongshan Mining Co., Ltd. has abundant iron ore resources, 460 million tons of iron ore reserves and an average geological grade of 36. It is the main iron ore raw material base of Kunming Iron and Steel Group Co., Ltd. Dahongshan iron ore belongs to the typical paleo-marine volcanic rock type iron ore, the ore body is complex and diverse, the ore nature is complex, the iron minerals are mainly fine hematite and magnetite, the gangue minerals are mainly silicate and quartz minerals. The fine grain size of iron-bearing minerals makes the separation, quality improvement and comprehensive recovery of metal iron bring great difficulties. After nearly ten years of mining, the ore properties have changed greatly, the iron grade of the raw ore has decreased to about 35%. With the development of production, the content of magnetite, which is easy to be separated, decreases, and the content of silicic iron ore, which is difficult to separate, increases. The difficulty of ore separation and enrichment is obviously increased. Before 2008, the iron grade of total tailings in ore dressing of Dahongshan Iron Mine was as high as 14% and the amount of iron metal lost in the tailings was huge. At the same time, the silicon content in iron concentrate reached more than 9%. Resulting in a sharp increase in the cost of subsequent smelting. In order to solve the above problems and realize the comprehensive utilization of mineral resources, from two aspects of the improvement of mineral processing technology and the comprehensive utilization of tailings, the experimental study on improving the quality and reducing the silicon content of the secondary strong magnetic concentrate and the tail-dropping test of the two-stage strong magnetic tailings are carried out. Experimental study on the tailings of Duan Qiang magnetic tailings and the continued tailings of the total tailings. The experimental results show that: (1) the centrifuge has a good effect on the improvement and reduction of silicon in the secondary strong magnetic concentrate. When the ore concentration is between 18% and 26%, the ore with a grade of 51% or 55% is sorted by centrifuge. A concentrate with a yield of 57%, a recovery rate of 71% and a recovery of 78% and a grade of up to 64% can be obtained. (2) the second stage of strong magnetic tailings for iron reduction is a combined scheme of high intensity magnetic centrifuge and rocking bed, and the content of SiO2 is reduced to about 4%. (2) in the second stage of the strong magnetic tailings, the process of iron reduction is combined with a strong magnetic centrifuge and a shaking bed. The grade of the second stage of strong magnetic tailings can be reduced from 26% to 12.53%. (3) the grade of the iron concentrate with 42.32% yield of 37.72% can be obtained by adopting a combined scheme of one coarse, one fine, one sweep magnetic-heavy process for reducing iron from the magnetic tailings of one Duan Qiang, and the results are as follows: (1) the grade of the second stage of the strong magnetic tailings can be reduced from 28% to 12.53%. The grade of tailings is reduced to 6.46. (4) the grade of iron concentrate is 53.11% and the tailing grade is 9.21% respectively. In general, it is through the above experimental research and application that Dahongshan has embarked on the road of efficient and comprehensive utilization of iron ore resources, the scale of production and product income has been continuously expanded, and has created more than 80% of the economic benefits of Dahongshan. It lays the foundation for the future development of Dahongshan Mine and provides a very important demonstration for the domestic complex and difficult mining, the efficient utilization of iron ore separation resources, the reduction of energy consumption, the reduction of tailings emissions and the protection of the environment. In view of the physical and chemical properties of high silicate and gangue, the complex structure is poor, fine, impurity difficult to be separated, limonite, and limonite, the first innovative application of high-magnetic-vibration-rocket-centrifuge gravity separation of magnetic-gravity combined flow, adapt to poor, fine, The separation of refractory minerals from hetero-high silicate. The tailing grade is reduced from 15.34% at the beginning to 10.53%, and the iron concentrate can be recovered from the tailings for 1 million t per year, and the silicon content of the iron concentrate decreases from 9% to 6.04%. Through experimental study, the aim of improving concentrate grade and reducing silicon content and iron content in tailings is achieved, and the comprehensive utilization of mineral resources is realized.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD951
本文编号：2213668
[Abstract]:With the rapid development of China's iron and steel industry, the domestic demand for iron ore is increasing, while the high price of imported iron ore seriously restricts the healthy development of iron and steel industry. Strengthening the development and utilization of iron ore in China plays an important role in the sustainable development of iron and steel industry. Yuxi Dahongshan Mining Co., Ltd. has abundant iron ore resources, 460 million tons of iron ore reserves and an average geological grade of 36. It is the main iron ore raw material base of Kunming Iron and Steel Group Co., Ltd. Dahongshan iron ore belongs to the typical paleo-marine volcanic rock type iron ore, the ore body is complex and diverse, the ore nature is complex, the iron minerals are mainly fine hematite and magnetite, the gangue minerals are mainly silicate and quartz minerals. The fine grain size of iron-bearing minerals makes the separation, quality improvement and comprehensive recovery of metal iron bring great difficulties. After nearly ten years of mining, the ore properties have changed greatly, the iron grade of the raw ore has decreased to about 35%. With the development of production, the content of magnetite, which is easy to be separated, decreases, and the content of silicic iron ore, which is difficult to separate, increases. The difficulty of ore separation and enrichment is obviously increased. Before 2008, the iron grade of total tailings in ore dressing of Dahongshan Iron Mine was as high as 14% and the amount of iron metal lost in the tailings was huge. At the same time, the silicon content in iron concentrate reached more than 9%. Resulting in a sharp increase in the cost of subsequent smelting. In order to solve the above problems and realize the comprehensive utilization of mineral resources, from two aspects of the improvement of mineral processing technology and the comprehensive utilization of tailings, the experimental study on improving the quality and reducing the silicon content of the secondary strong magnetic concentrate and the tail-dropping test of the two-stage strong magnetic tailings are carried out. Experimental study on the tailings of Duan Qiang magnetic tailings and the continued tailings of the total tailings. The experimental results show that: (1) the centrifuge has a good effect on the improvement and reduction of silicon in the secondary strong magnetic concentrate. When the ore concentration is between 18% and 26%, the ore with a grade of 51% or 55% is sorted by centrifuge. A concentrate with a yield of 57%, a recovery rate of 71% and a recovery of 78% and a grade of up to 64% can be obtained. (2) the second stage of strong magnetic tailings for iron reduction is a combined scheme of high intensity magnetic centrifuge and rocking bed, and the content of SiO2 is reduced to about 4%. (2) in the second stage of the strong magnetic tailings, the process of iron reduction is combined with a strong magnetic centrifuge and a shaking bed. The grade of the second stage of strong magnetic tailings can be reduced from 26% to 12.53%. (3) the grade of the iron concentrate with 42.32% yield of 37.72% can be obtained by adopting a combined scheme of one coarse, one fine, one sweep magnetic-heavy process for reducing iron from the magnetic tailings of one Duan Qiang, and the results are as follows: (1) the grade of the second stage of the strong magnetic tailings can be reduced from 28% to 12.53%. The grade of tailings is reduced to 6.46. (4) the grade of iron concentrate is 53.11% and the tailing grade is 9.21% respectively. In general, it is through the above experimental research and application that Dahongshan has embarked on the road of efficient and comprehensive utilization of iron ore resources, the scale of production and product income has been continuously expanded, and has created more than 80% of the economic benefits of Dahongshan. It lays the foundation for the future development of Dahongshan Mine and provides a very important demonstration for the domestic complex and difficult mining, the efficient utilization of iron ore separation resources, the reduction of energy consumption, the reduction of tailings emissions and the protection of the environment. In view of the physical and chemical properties of high silicate and gangue, the complex structure is poor, fine, impurity difficult to be separated, limonite, and limonite, the first innovative application of high-magnetic-vibration-rocket-centrifuge gravity separation of magnetic-gravity combined flow, adapt to poor, fine, The separation of refractory minerals from hetero-high silicate. The tailing grade is reduced from 15.34% at the beginning to 10.53%, and the iron concentrate can be recovered from the tailings for 1 million t per year, and the silicon content of the iron concentrate decreases from 9% to 6.04%. Through experimental study, the aim of improving concentrate grade and reducing silicon content and iron content in tailings is achieved, and the comprehensive utilization of mineral resources is realized.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD951
【共引文献】
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1 高扶朋;李登新;史振涛;;印刷线路板中电解溶解金属的研究[J];广东化工;2015年13期
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1 陈田庄;锌焙砂闪速还原焙烧产物选择性酸浸工艺研究[D];中南大学;2013年
2 岑贞粟;基于多特征时间点的针铁矿法沉铁过程动态模型研究[D];中南大学;2014年
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