Test and industrial application of low silicon alkaline pellet with limestone under sieve
Calcium based fluxes are mixed with iron ore and finely grinded and added into pellets,which are rarely used in domestic ironmaking industry.Mixing ground limestone under sieve and iron ore powder into pellets can im-prove the homogenization level of calcium flux,enhance the activity of flux,improve the quality of pellets,and real-ize the secondary utilization of solid waste resources.Shougang Jingtang United Iron and Steel Co.,Ltd.carried out pelletizing test and industrial practice with limestone under sieve.The economy and grindability of grinding were evaluated through bond work index detection and filtration performance test.Through the balling and roasting tests,the impact trend of the mixed grinding of limestone under sieve and iron materials on the quality of pellets was ob-tained.The results show that the flux has a more uniform distribution of calcium after adding the mixture of lime-stone under sieve and iron ore powder,and is more closely combined with iron ore powder.The consolidation quality of pellet remains at a high level,with a compressive strength of over 3 196 N/P.The reduction performance has a trend of improvement,with the reduction expansion rate decreasing from 14.5％to 13.8％,and the reduction de-gree increasing from 84.8％to 86.9％.
limestone under sievealkaline pellethomogenization of flux distributionconsolidation qualitymetal-lurgical property
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