鞍钢烧结熔剂粒度和配比的优化研究

An Optimization of Particle Size and Sintering Ratio of Flux in Sintering Process of Anshan Iron and Steel Company

针对传统的熔剂高温性能评价方法存在的不合理、不全面问题,设计了烧结熔剂高温性能检测方法,对鞍钢常用烧结熔剂高温性能进行了检测,结果表明,鞍钢所用的4种生石灰中,生石灰3高温性能最优;所用4种石灰石中,石灰石2的高温性能最优。选用石灰石2进行石灰石粒度优化试验研究,石灰石的适宜粒度为-3 mm粒级占80%~85%,考虑到破碎加工成本,鞍钢石灰石粒度-3 mm粒级含量可控制为大于75%。选用生石灰3进行生石灰适宜配比研究,其配比应依据进口富矿粉配加比例适当调整,在鞍钢烧结原料和工艺条件下,生石灰适宜配比(Y)与粉矿配比(X)的数学对应关系为:Y=6.019 84-0.133 82X+0.002 82X^2(R^2=0.998 3)。研究成果应用于生产实践后,烧结利用系数提高,固体燃耗降低,成品率提高,配加石灰石的成本降低0.3元/t,经济效益巨大。

Aiming at the irrationality and incompletion of traditional evaluation method for high-temperature performance of flux,a new method was designed for testing high-temperature performance of the commonly used sintering flux in Ansteel Group. Test results showed that 3#quicklime had an optimum high-temperature performance among 4 kinds of quicklime commonly used in Ansteel Group,while 2#limestone presented to be optimum among 4 kinds of limestone. Then,the particle size optimization test with 2#limestone indicated that the limestone with 80% ~ 85% passing size of -3 mm is preferable. Considering the cost of crushing,the proportion of passing size-3 mm of limestone used in Ansteel can be controlled to be more than 75%. Later,3~# quicklime was selected in the test on quicklime blending proportion,with an appropriate adjustment based on the proportion ratio of added imported fine ore. According to the raw materials and technical conditions required for the sintering process in Ansteel Group,a mathematical relation between the appropriate proportion of quicklime and fine ore was found to be as Y = 6. 019 84-0. 133 82 X ＋ 0. 002 82 X^2（R^2= 0. 998 3）. This research result was then applied into practical production,leading to an increase in the sintering utilization coefficient,a reduction in the solid fuel consumption. There is not only an improvement in the rate of finished product,but also the cost of limestone is reduced by 0. 3 Yuan per ton,which can bring a great economic benefit to the company.