攀枝花硫酸渣内配碳球团成型试验研究

Research on forming experiment of Panzhihua pyrite residue pellets with carbon-containing

为分离回收攀枝花硫酸渣中的铁资源,以攀枝花硫酸渣为原料,煤粉为碳源,PVA为粘结剂,采用正交试验和单因素优化试验探索了粘结剂用量、含水量、压强、粒度组成等因素对硫酸渣内配碳球团机械强度性能的影响。研究表明:压强对硫酸渣内配碳球团强度性能的影响最大,其次为粘结剂用量、含水量,粒度组成的影响最小。试验获得了硫酸渣内配碳球团成型的适宜工艺为:粘结剂用量0.4%、含水量9%、压强10 MPa。此条件下球团的抗压强度为185.4 N/球、落下强度为42.5次/球,达到球团工业生产中对机械强度的要求。该研究成果将为硫酸渣中铁资源的还原分离回收提供参考,也为攀枝花钒钛磁铁矿资源综合利用率的提高奠定一定的基础。

In order to separate and recover iron resources of Panzhihua pyrite residue,using Panzhihua pyrite residue as raw material,pulverized coal as carbon source,and polyvinyl alcohol(PVA)as binding agent,the influences of the content of polyvinyl alcohol,the water content,the pressure and the particle size composition on the mechanical strength properties of pyrite residue carbon pellets were studied in this paper by orthogonal experiments and single factor optimization experiments.The research results show that the pressure has the greatest influence on the strength properties of pyrite residue carbon pellets,followed by the content of polyvinyl alcohol and water content,and finally the particle size composition.The appropriate process for forming pyrite residue carbon pellets was obtained including the content of polyvinyl alcohol of 0.4%,the water content of 9%,the pressure of 10MPa,and below 88μm particle size of 70%.Under these conditions,the compressive strength of pellets was 185.4 N/pellet and the falling strength was 42.5 times/pellet,which meet the requirements of mechanical strength in pellets industrial production.The research results will provide reference for the reduction,separation and recovery of iron resources from pyrite residue,and also lay a certain foundation for the improvement of the comprehensive utilization rate of Panzhihua vanadium titano-magnetite resources.