摘要:
针对钛精矿粒度细,电炉冶炼损耗高的问题,着重对细粒级钛精矿烧结造块工艺进行了试验探索与研究。细粒级钛精矿烧结存在制粒效果差,燃耗高,生产效率低的问题。通过理化检测及物相分析,确定了钛精矿烧结的固结机理、烧结基本规律及制粒效果差的原因。优化制粒试验表明,通过添加熔剂,优化燃料配比及水分,并对钛精矿进行磨制处理后,钛精矿烧结混合料制粒效果得到改善。通过降低烧结料层,对磨制后的钛精矿造球并采用在料面分加燃料的方式进行烧结,烧结技术经济指标得到显著改善,钛精矿烧结+1 mm比例由50.3%提高至89.4%,利用系数由0.177 t/(m2·h)提高至0.712 t/(m2·h)。从烧结试验结果看,采用该方法进行钛精矿烧结,烧结过程钛精矿硫脱除率在40%左右,影响TiO2品位约3~4个百分点。
关键词:
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钛精矿 /
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烧结 /
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细粒级 /
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脱硫效率
Abstract:
In view of the problems of fine particle size and high loss during electric furnace smelting of ilmenite concentrate,the sintering process of fine ilmenite concentrate was studied in this paper.It has the disadvantages of poor granulating,high burnup and low production efficiency for sintering of fine ilmenite concentrate.By physical and chemical detection and phase analysis,the consolidation mechanism of titanium concentrate and the reasons for the poor granulating effect were determined.Experimental results show that by adding flux,optimizing ratio of fuel and water,and grinding the ilmenite concentrates,the granulating effect of the ilmenite concentrates is improved.Through reducing sintering material layer,pelletizing the grinded ilmenite concentrate and adopting fuel divided adding on surface of the material for sintering,the technical and economic indicators of sintering are improved significantly,with the ratio of particles of +1 mm increased from 50.3% to 89.4% and the utilization coefficient enhanced from 0.177 t/(m2·h) to 0.712 t/(m2·h),respectively.The desulfurization rate of ilmenite concentrate in the sintering process proposed in this paper is about 40%,influencing about 3%~4% of the TiO2 grade.