摘要:
以攀枝花钒钛磁铁矿尾矿为原料，聚乙烯醇为黏结剂，研究了粒度组成、水分含量、压力、聚乙烯醇含量、配碳量等因素对尾矿含碳球团强度的影响。研究表明：球团强度随粒度细化和水分含量提高呈先升后降，随PVA含量的增加而逐步提高；随压力升高，抗压强度呈“N”字型变化，落下强度先升后降；随配碳量的提高，抗压强度先升后降，落下强度逐渐降低。获得了制备钒钛磁铁矿尾矿含碳球团的优化工艺参数为：-75μm占40%，水分含量8%，压力8 MPa，PVA含量0.6%，配碳量15%。在此条件下制得球团的抗压强度185.4 N，落下强度42.5次，完全满足工业生产中对球团强度的要求。
关键词:
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钒钛磁铁矿 /
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尾矿 /
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球团 /
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抗压强度 /
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落下强度
Abstract:
Using Panzhihua vanadium-titanium magnetite tailings as raw materials and polyvinyl alcohol as binding agent,the influences of the particle size composition,the moisture content,the pressure,the content of polyvinyl alcohol and the carbon content on the strength of resulted pellets were studied in this paper.The results showed that the pellet strength increased firstly and then decreased with the grain size refinement and increase of the moisture content,and gradually increased with the increase of polyvinyl alcohol content.Besides,with the increase of the pressure,the compressive strength changed with "N" shape,and the drop strength increased firstly and then decreased.With the increase of carbon content,the compressive strength first increased and then decreased,and the drop strength gradually decreased.The optimized technology parameters obtained were that the tailings contain minus 75 μm was 40%,the moisture content 8%,the pressure 8 MPa,the content of polyvinyl alcohol 0.6% and the carbon content 15%.Under these conditions,the compression strength of the pellets was 185.4 N and the drop strength was 42.5 times,which was fully meet the requirements for pellet strength in industrial production.
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