金尾矿粗粒制备陶瓷原料—细粒胶结充填实验研究

Experimental Study of Ceramic Raw Material Preparation and Fine−grained Cemented Filling in Coarse Gold Mine Tailings

  • 摘要: 以金尾矿为主要原料,采用分级和磁选两种工艺对其进行了“粗细分级—粗粒制备陶瓷原料、细粒充填”技术实验研究。结果表明,采用Φ150 mm旋流器,在金尾矿给矿浓度为28.28%的条件下,实现了底流+325目92.83%、溢流−325目96.09%的有效分级。底流物料经过一段弱磁选—两段强磁选工艺后能够获得白度59.09%、氧化铁含量0.15%、产率58.98%的长石石英产品,有效地实现除铁提质增白效果,满足陶瓷用瓷石轻工行业标准要求。针对溢流物料,当灰砂比在1∶10、料浆质量浓度在65%以上时可满足胶结充填要求,28 d抗压强度为1 MPa。实验研究结果可为金尾矿资源化利用价值提供指导。

     

    Abstract: This study explores the “coarse−fine classifying, coarse particle for ceramic raw material preparation, and fine particle for filling” technology employing classification and magnetic separation process with the utilization of gold tailings as the primary raw material. The results indicated that the Φ150 mm cyclone effectively classifies the gold mine tailings with a feed concentration of 28.28%, achieving a bottom stream of +325 mesh at 92.83% and an overflow of −325 mesh at 96.09%. Subsequent to the process of initial weak magnetic separation and two stages of strong magnetic separation, a feldspar−quartz output with a whiteness of 59.09%, an iron oxide content of 0.15%, and a productivity of 58.98% can be obtained in the bottom stream material, which effectively achieves the quality improvement, iron removal, and whitening, meeting the light industry standards for ceramic−grade porcelain stone. For overflow material, with an ash−to−sand ratio of 1∶10 and a slurry concentration exceeding 65%, it can meet the requirements for cemented filling and achieve 28−day compressive strength of 1MPa. These outcomes provide valuable insights for enhancing the resource utilization of gold tailings.

     

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