拜耳法赤泥替代烧结法氧化铝生产中高铁矿石实践  

Practice of Using Bayer Process Red Mud to Replace SinteringProcess for High-Iron Content Ore in Alumina Production

作　　者：王松林 WANG Songlin(Zhongzhou Aluminum Co.,Ltd.,Aluminum Corporation of China Limited,Jiaozuo 454174,China)

机构地区：[1]中铝中州铝业有限公司,河南焦作454174

出　　处：《绿色矿冶》2024年第4期67-72,共6页Sustainable Mining and Metallurgy

摘　　要：拜耳法溶出赤泥中的铁矿物(铝针铁矿和赤铁矿)含量达到60%以上,可替代高铁矿石作为辅料调配烧结法熟料,提高氧化铝净溶出率。本文先从理论出发,并进行了实验室实验,分析采用赤泥配矿后烧结用矿品位的变化、熟料化学成分、熟料溶出指标以及熟料溶出沉降性能,并与高铁矿石配矿模式下的指标进行对比。实验结果表明,使用低温拜耳法赤泥调配烧结法熟料,熟料的氧化铝含量及铝硅比A/S有所下降,但氧化铝及氧化钠的标准溶出率基本相当,熟料溶出后粗液的吸光度有所降低,熟料溶出产生的赤泥的沉降压缩性能相当。因此,使用低温拜耳法赤泥调配烧结法熟料在工艺上可行。采用赤泥配矿后,生产实际现场通过调整熟料碱比和钙比、修正[F/A]控制范围、调整生料浆固定碳含量等措施,达到了烧结法氧化铝生产运行指标的优化提高,既降低了烧结法系统的用矿成本,又实现了赤泥的再利用,对国内低品位铝土矿烧结法氧化铝生产在提高氧化铝净溶出率方面具有一定的借鉴意义。The content of iron minerals(alumino goethite and hematite)in the red mud dissolved by the Bayer method reaches more than 60%,which can replace high iron ore as an auxiliary material to prepare sintering clinker and improve the net dissolution rate of alumina.In this paper,based on the theory,the laboratory experiment was carried out to analyze the change of sinter grade,clinker chemical composition,clinker dissolution index and clinker dissolution and sedimentation performance after red mud ore blending,and compared with the index of high iron ore blending mode.The experimental results show that the alumina content and aluminum-silicon ratio(A/S)of the clinker are reduced by using the low-temperature Bayer process red mud to prepare the sintering clinker,but the standard dissolution rates of alumina and sodium oxide are basically the same.The absorbance of the coarse liquid after the clinker dissolution is reduced,and the sedimentation and compression properties of the red mud produced by the clinker dissolution are comparable.Therefore,it is feasible to use low-temperature Bayer red mud to prepare sintering clinker.After adopting red mud ore blending,by adjusting the clinker alkali ratio and calcium ratio,correcting the[F/A]control range,adjusting the fixed carbon content of raw slurry and other measures in the actual production site,the optimization and improvement of the operation index of alumina production by sintering method is achieved,which not only reduces the ore cost of sintering system,but also realizes the reuse of red mud.It is of certain significance to improve the net dissolution rate of alumina in the production of alumina by sintering method of low grade bauxite in China.

关 键 词：拜耳法赤泥 烧结法 熟料 净溶出率 

分 类 号：TF821[冶金工程—有色金属冶金]