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金属矿山 ›› 2020, Vol. 50 ›› Issue (05): 178-184.

• 矿物工程 • 上一篇    下一篇

酒钢尾矿悬浮磁化焙烧扩大连续试验研究

陈毅琳,唐晓玲,李艳军,刘金长,孙永升   

  1. 1. 酒钢集团宏兴钢铁股份有限公司,甘肃 嘉峪关 735100;2. 东北大学资源与土木工程学院,辽宁 沈阳 110819
  • 出版日期:2020-05-15 发布日期:2020-06-12
  • 基金资助:
    甘肃省科技重大专项项目(编号:19ZD2GB001)。

Expansion Continuous Experimental of Suspension Magnetization Roasting for JISCO Tailings

Chen Yilin,Tang Xiaolin,Li Yanjun,Liu Jinchang,Sun Yongsheng   

  1. 1. JISCO Group Hongxing Iron & Steel Co.,Ltd., Jiayuguan 735100, China;2. School of Resourses and Civil Engineering, Northeastern University, Shenyang 110819, China
  • Online:2020-05-15 Published:2020-06-12

摘要: 酒钢选厂强磁选工艺产生的铁尾矿品位较高,约为21.50%。尾矿大量堆存不仅占用土地、污染环境,还浪费了大量铁资源。为了研究利用悬浮磁化焙烧技术处理该类尾矿的可行性,缓解酒钢原料不足的矛 盾,对该尾矿进行了预富集—悬浮磁化焙烧—磁选—反浮选扩大试验研究。试验结果表明:①酒钢尾矿经一段弱磁—两段强磁预富集工艺分选,获得了铁品位26.01%、回收率82.71%的预富集精矿,预富集精矿中含铁 矿物主要为赤铁矿、磁铁矿和菱铁矿,脉石矿物主要为石英、白云石和重晶石。②预富集精矿在还原温度530 ℃、CO流量2.0 m3/h、N2流量3.0 m3/h、处理量99 kg/h的适宜悬浮焙烧工艺参数下,稳定试验连续运行了 48 h,取得了磁选管磁选铁精矿平均铁品位51.41%、铁回收率72.39%的技术指标。③酒钢总尾矿采用预富集—悬浮焙烧—磁选—反浮选全流程处理,最终可获得铁品位58.67%、铁回收率57.82%、SiO2含量6.48%的铁精 矿,综合尾矿铁品位12.00%,指标良好。该试验结果为酒钢下一步对该类尾矿资源的回收利用提供了技术依据。

关键词: 尾矿坝尾矿, 强磁预富集, 悬浮磁化焙烧, 磁选, 反浮选

Abstract: The iron grade of JISCO tailings from magnetic separation is about 21.50%. A large amount of tailings stockpilling in tailing dam not only occupied the lands and polluted the environment but also wasted iron resourses. In order to study the feasibility of the suspension magnetization roasting technology for the tailings utilization and relieve the pressure of shortage of raw material in JISCO, the pre-enrichment-suspension magnetization roasting-magnetic separation-reverse flotation expansion experiment research was conducted for the tailings. The test results showed that: ①The tailings are sorted by one-stage weak magnetic and two-stage strong magnetic pre-enrichment process to obtain a pre-enriched concentrate with iron grade of 26.01% and recovery rate of 82.71%. The main iron minerals in the pre-enriched concentrate are hemetite, magnetite and siderite. The major gangue minerals in the pre-enriched concentrate are quartz, dolomite and barite.②In the suitable process parameters condition of reduction temperature of 530 ℃, CO flow of 2.0 m3/h, N2 flow of 3.0 m3/h, treatment amount of 99 kg/h, the tests run stablely in 48 h and get the better technology indexes of average iron grade of 51.41% and average iron recovery rate of 72.39% after magnetic separation with magnetic tube. ③Iron concentrate could be obtained with iron grade of 58.67%, iron recovery rate of 57.82%, SiO2 content of 6.48%, and comprehensive tailing iron grade is of 12.00% in the whole process of pre-enrichment-suspension roasting-magnetic separation-reverse flotation, which provides technical basis for next stage recycling process of the tailings resources in JISCO.

Key words: Tailings in tailings dam, Strong magnetic pre-enrichment, Suspension magnetization roasting, Magnetic separation, Reverse flotation