首钢京唐降低烧结矿SiO2含量的研究及应用

Research and application on reducing SiO2 content in sinter in Shougang Jingtang

采用烧结杯试验方法对首钢京唐铁矿粉低SiO2烧结及优化措施进行研究,并进行工业试验及工业应用。结果表明,在京唐配料结构下,烧结矿SiO2质量分数由5.60%降至5.00%,烧结矿转鼓指数、成品率和粒度有所变差。粗化焦粉粒度对提高转鼓指数的效果最明显;提高混合料温度对烧结各项指标基本都有改善,尤其对提高成品率的效果最明显;提高料层厚度对降低燃耗等指标有利。在工业应用中,采取提高料层厚度30 mm、提高料温5-10℃、放宽燃料粒度（小于3mm比例）2%、降低镁质熔剂使用量以及优化配矿等措施,使京唐烧结矿的铁酸钙体积分数基本得到保证,达到45%以上,促使烧结矿产质量保持稳定且有改善。

Sintering pot tests were applied to study the low SiO2 sintering and optimization measures,and then industrial test and application were carried out.The results showed that the drum index,yield and grain size of sinter was deteriorated when the SiO2 mass fraction in sinter decreased from 5.60%to 5.00% under the match structure of iron ores in Jingtang.Coarsening coke powder size had obvious effects on improving sinter drum index.Each basic index of sinter were improved by increasing the temperature of blending material,especially for the sinter yield.It was beneficial for reducing the fuel consumption to increase the sintering material thickness.Moreover,in industrial practice,through improving the material thickness by 30 mm,raising temperature by 5-10 ℃,loosening the fuel particle size（〈3 mm）by 2%,decreasing the use of fluxes containing MgO and optimizing ore-blending,etc,the volume fraction of SFCA was up to above 45%,which prompted the sinter yield or quality to keep stable and to improve after reducing silicon.