煤系硬质高岭土提纯及溢流磁选增白试验研究

Experiment Study on Coal-measures Hard Kaolin Purifi cation and Overfl ow Magnetic Separation Whitening

以吉林白山煤系硬质高岭土为研究对象,原矿经磨矿后采用Φ75 mm、Φ50 mm、Φ25 mm、Φ10 mm 4级水力旋流器进行除砂提纯,对溢流产品进行磁选增白试验研究。结果表明,Φ75 mm旋流器粗选除砂,溢流经Φ50 mm、Φ25 mm、Φ10 mm旋流器提纯,高岭石实现较好富集,Φ10 mm旋流器对-2μm分级效果显著,三者最适宜的入料压力分别为0.20 MPa、0.30 MPa、0.65 MPa;Φ50 mm旋流器溢流最佳磁选工艺为1.2 T条件下进行2段磁选,煅烧白度为90.89%;Φ25 mm及Φ10 mm旋流器溢流进行1段磁选,最佳磁场强度分别为1.3 T、1.2 T,白度分别为91.18%、91.45%。

The coal-measures hard kaolin from Baishan of Jilin was taken as the research object, the purification process was implemented by Ф75 mm, Ф50 mm, Ф25 mm and Ф10 mm hydrocyclone, and the overflow product was taken as materials, experiments of the whitening was realized by magnetic separation. The results showed that Ф75 mm hydrocyclone was chosen as the main sand eliminator, the suitable pressure were 0.20 MPa, 0.30 MPa and 0.65 MPa respectively when separation equipment were Ф50 mm, Ф25 mm and Ф10 mm hydrocyclone, kaolinite achieved better enrichment and the classification effect of -2 μm was remarkable by Ф10 mm hydroeyclone. The best magnetic separation process of Ф50 mm hydrocyclone overflow was series magnetic separation under the condition of 1.2 T, and calcination whiteness was up to 90.89%; Ф25 mm and Ф10 mm cyclone should be processed once when the magnetic density were 1.3 T and 1.2 T respectively, and calcination whiteness was up to 91.18% and 91.45%.