摘要
攀枝花高钛型精矿（w（TiO2）〉12.5%）烧结技术经济指标差,一种w（TFe）=55%、w（TiO2）=9%、粒度小于0.074 mm粒级质量分数达到80%以上的中钛型精矿,按一定比例配入高钛型精矿烧结,能强化制粒、降低熔点、增加液相量而改善烧结矿性能指标,最突出的价值在于节约高价富矿粉的用量,降低烧结矿成本。该精矿化学成分、矿物组成与粒度分布、制粒性能、烧结性能与高钛型精矿有较大的差异,在实验室与烧结机上进行了系统的试验研究。结果表明,采用中钛型精矿替代部分高钛型精矿,混合料粒度组成改善,烧结速度加快,增产效果明显,每增加10%中钛型精矿,增产幅度达到5.35%,可弥补高钛型精矿烧结利用系数低的缺陷。采用中钛型精矿替代部分高钛型精矿,烧结矿矿物组成改善,铁酸钙体积分数呈增加趋势且高于基准期,钙钛矿呈减少趋势,硅酸盐也呈增加趋势,冶金性能变化不大。工业试验结果表明,采用25%中钛型精矿替代高钛型精矿,利用系数比基准期上升0.023 t/（m^2·h）,转鼓指数上升0.16%,固体燃耗下降,烧结总体效果优于高钛型精矿烧结。
As technical and economic indexes were worse with high titanium concentrate sintering,when a medium titanium concentrate of iron content 55%,TiO29%,-0.074 mm size fraction more than 80% matched into high titanium concentrate of TiO2 more than 12.5% sintering by suitable proportion what could strengthen granulation,lower melting point,increase amount of liquid phase and improve the sinter performance indexes so that the most prominent value was saving high price rich ore consumption and reducing sinter cost. The system experiment research was achieved in aboratory and sintering machine as chemical composition,mineral composition and particle size distribution of this medium titanium concentrate is more different comparing with high titanium concentrate. With medium titanium concentrate replacing part of high titanium concentrate sintering,experiment results in laboratory showed that mix partical size was improved,sintering speed accelerated,increasing yield effect was obvious,the rate of increasing output reached 5.35% by each increasing 10% medium titanium concentrate so that can make up the defects of low utilization coefficient of high titanium concentrate sintering.On the other hand,sinter mineral composition was improved,content of calcium ferrite increased and was higher than the reference period,perovskite showed a trend of decreasing,silicate content also increased,metallurgical properties had no change. With 25% medium titanium concentrate insteading of high titanium concentrate,the industrial test results showed that utilization coefficient rose 0.023 t/（m^2·h）,drum index increased 0.16%,solid fuel consumption decreased,so the sintering overall effect was superior than high titanium concentrate sintering.
作者
蒋大军
JIANG Da-jun(Ironmaking Plant, Panzhihua Vanadium Steel Co., Ltd., Panzhihua 617024, Sichuan, China)
出处
《钢铁》
CAS
CSCD
北大核心
2018年第5期18-24,67,共8页
Iron and Steel
关键词
中钛型精矿
制粒性能
烧结特性
矿物组成与结构
综合效果
medium titanium concentrate
prilling property
sintering characteristic
mineral composition and structure
comprehensive effect
