加拿大某精矿高配比烧结特性

doi:10.13228/j.boyuan.issn0449-749x.20130518

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摘要采用烧结杯试验、冶金性能检测及基础物化性能检测等多种方法研究了产自加拿大的某精矿的配矿烧结性能、烧结矿冶金性能及物化性质，对其烧结特点从物化性质方面进行了分析。结果表明:随精矿配比(质量分数)由24%增加到42%，烧结料层透气性阻力由857 Pa提高到1 150 Pa,垂直烧结速度由21.87 mm/min下降到18.38 mm/min，利用系数从1.14 t/(m2·h)降低到0.93 t/(m2·h)，转鼓强度由67.47%下降到64.13%，无烟煤固体燃耗由62.46 kg/t提高到70.42 kg/t，烧结成品矿还原性指数(RI)由82.31%下降到78.76%，低温还原粉化率(RDI＞3.15 mm)由70.71%下降到64.41%，烧结各项指标及烧结矿的冶金性能均出现较大幅度恶化。物化性质分析表明，加拿大精矿的主要矿物组成是镜铁矿和假象赤铁矿，矿物表面亲水性差，且粒度组成不合理，恶化混合料制粒；同时，该精矿的颗粒表面光滑致密，高温反应性能差,软化温度在1 450 ℃以上，烧结过程中难以形成足够液相。加拿大精矿制粒性能差导致烧结料层透气性阻力大造成烧结利用系数低，而较高的软化温度导致随着该矿配比的提高烧结矿转鼓强度降低。

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	潘建
	师本敬
	朱德庆
	李晓波

关键词 ：加拿大精矿, 高配比, 烧结性能, 物化性质, 制粒性能

Abstract：The sintering performance of Canada iron concentrate and metallurgical performance of sinter product was studied, the physic-chemical properties was investigated. The results show that the sintering indexes and metallurgical performance of sinter product both get some worse with the mixing rate of concentrate increasing from 24% to 42%. The permeability resistance of sinter bed increases from 857 Pa to 1 150 Pa ,the vertical sintering speed drops to 18.38 mm/min from 21.87 mm/min, the productivity declines from 1.14 t/(m2·h)to 0.93 t/(m2·h),the tumble index falls to 64.13% from 67.47%, the anthracite solid fuel consumptions increases to 70.42 kg/t from 62.46 kg/t, meanwhile, the reduction index(RI)and the reduction degradation index RDI＞3.15 mm for sinter product drops from 82.31% and 70.71% to 78.76% and 64.41%, respectively. This kind of concentrate was bad for granulating of mixture because of its major mineral-specularite and martite whose mineral surface has poor hydrophilicity-and unreasonable size composition, meanwhile, it is hard to generate enough liquid during sintering due to its dense and smooth surface and poor sintering capability-its softening temperature is more than 1 450 ℃. Therefore, poor granulating performance of Canadian concentrate leads to worse layer permeability then cause poor sintering performance, while high softening temperature results in the tumble index decreases when the mixing rate of concentrate increases.

收稿日期: 2013-09-18 出版日期: 2014-09-10

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引用本文:

潘建，师本敬，朱德庆，李晓波. 加拿大某精矿高配比烧结特性[J]. 钢铁, 2014, 49(9): 21-28. PAN Jian, SHI Ben-jing, ZHU De-qing, LI Xiao-bo. High Proportion Sintering Performance of Canadian Iron Concentrate. Iron and Steel, 2014, 49(9): 21-28.

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