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为了对包头稀土尾矿中的铁进行回收,同时兼顾稀土、铌的富集,采用“煤基直接还原—弱磁选”对稀土浮选尾矿进行了铁的回收试验。考察了焙烧温度、保温时间、配碳比对直接还原产品的金属化率的影响,以及磁场强度对磁选产品铁的品位、回收率和产率的影响。研究发现:在磨矿粒度-200目,焙烧温度为1200℃,保温时间为2 h,固定C/O=1.00的条件下,采用煤基直接还原,得到金属化率86.59%的还原矿;再对还原矿采用磁选管以160 kA.m-1的磁场强度进行弱磁选,从TFe=25.40%的稀土尾矿获得的磁选产品全铁品位达到82.36%,产率为32.08%,回收率达82.91%,稀土、铌均在磁选渣中富集。
In order to recover the iron in Baotou rare earth tailing, taking into account the enrichment of rare earth and niobium at the same time, the iron recovery experiment was carried out on rare earth flotation tailings by adopting “coal-based direct reduction-weak magnetic separation”. The effects of calcination temperature, holding time and carbon ratio on the metallization of direct reduction products were investigated. The effects of magnetic field strength on the grade, recovery and yield of iron were also investigated. The results showed that the reduction rate of 86.59% metallization was obtained by coal-based direct reduction with grinding particle size of -200 mesh, calcination temperature of 1200 ℃, holding time of 2 h and fixed C / O = 1.00. The weak magnetic separation of magnetic reduction tube with magnetic field of 160 kA.m-1 was applied to the reduction ore. The total iron grade of the magnetic separation product obtained from rare earth tailings with TFe = 25.40% reached 82.36% and the yield was 32.08% Rate of 82.91%, rare earth, niobium are enriched in magnetic separation slag.