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金属矿山 ›› 2020, Vol. 49 ›› Issue (09): 202-207.

• 综合利用 • 上一篇    下一篇

铜冶炼渣直接还原焙烧—磁选回收铜、铁试验研究

邱廷省,周丽萍,李国栋   

  1. 1. 江西理工大学资源与环境工程学院,江西 赣州 341000;2. 西北矿冶研究院,甘肃 白银 730900
  • 出版日期:2020-09-15 发布日期:2020-10-19
  • 基金资助:
    “十三五”国家重点研发计划项目(编号:2018YFC1903400)

Experimental of Copper and Iron Recovery from Copper Smelting Slag by Direct Reduction Roasting and Magnetic Separation

QIU Tingsheng,ZHOU Liping,LI Guodong   

  1. 1. Faculty of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China; 2. Northwest Research Institute of Mining and Metallurgy, Baiyin 730900, China
  • Online:2020-09-15 Published:2020-10-19

摘要: 铜冶炼渣中含有铜、铁等有价金属,其中铜金属可通过直接浮选回收,但铁的矿物组成复杂,很难直接通过磁选回收。以含铁38.76%、含铜2.26%的铜冶炼渣为研究对象,在矿石性质研究基础上,以烟煤为还原剂,通过直接还原焙烧—磁选工艺回收铜渣中的铜、铁。结果表明,铜冶炼渣、烟煤和还原助剂氧化钙以100∶25∶20的质量比混合,在焙烧温度1 200 ℃,焙烧时间80 min的条件下直接还原焙烧铜渣;焙砂在磨矿细度为-0.045 mm含量占80%,磁场强度为111 kA/m的条件下进行磁选试验,最终可获得铁品位为91.54%,铁回收率为90.54%,铜品位为6.06%、铜回收率为89.04%的含铜铁精矿,研究结果可为铜冶炼渣的回收利用提供依据。

关键词: 铜冶炼渣, 直接还原焙烧, 磁选, 综合回收

Abstract: Copper smelting slag contains valuable metals such as copper and iron. Copper metal could be recovered directly by flotation, but iron minerals are difficult to separate directly by magnetic separation due to complex minerals composition. In this paper, copper smelting slag containing 38.76% iron and 2.26% copper was taken as the research object. Based on the analysis of ore properties, copper and iron were recovered from the copper slag by direct reduction roasting and magnetic separation process when bituminous coal was used as the reducing agent. The results showed that the copper smelting slag, bituminous coal and CaO were mixed at a mass ratio of 100∶25∶20, and then roasted in 1 200 ℃ for 80 minutes. The roasted samples were ground to -0.045 mm accounted for 80%, and then subjected to magnetic separation at magnetic field intensity of 111 kA/m. Finally, concentrates with 91.54% iron-containing and 6.06% copper-containing was obtained. The corresponding recovery rates were 90.54% of copper and 89.04% of iron, respectively, which provides basis for the production and utilization of the copper smelting slag.

Key words: copper smelting slag, direct reduction roasting, magnetic separation, comprehensive recovery