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酒钢球团烧结法新工艺烧结过程透气性研究
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摘要
本文针对酸性球团烧结新工艺工业生产中存在着烧结过程透气性差、成品烧结矿细粒级含量高的问题,通过对酸性球团烧结工艺原始料层透气性和普通烧结工艺原始料层透气性、酸性球团烧结工艺实际生产过程中料层温度变化和负压变化等的测定及对添加白云石、钒钛矿、萤石的酸性球团烧结矿矿相分析及粘结相粘度测试、配加白云石、钒钛矿工业生产试验、外滚生石灰改善酸性球团烧结过程透气性等试验,探讨了解决问题的途径。研究表明,由于酒钢酸性球团烧结工艺增加了造球工序,烧结料粒度组成远优于普通烧结工艺,但在烧结过程中透气性却比普通烧结工艺差,其原因主要是烧结过程中熔融带透气性较差;酒钢酸性球团烧结工艺烧结过程透气性差的根本原因是酸性球团烧结矿的粘结相以含铁硅酸盐为主,这种粘结相矿物熔滴区间宽,熔体粘度大,使得液相数量与烧结透气性的矛盾显得十分突出;在烧结料中配入一定量的TiO_2、CaF_2和MgO可显著降低其粘度。在此基础制定了相应的措施,在实际生产中进行了应用,取得了令人满意的结果。
JISCO(.Iiuquan Iron and Steel Company) had developed a new acid pellet sintering process, but there are still some problems to be dissolved, such as poor gas permeability and higher rate of fine material in product. These were studied through the experiments of gas permeaability of different processes, the changes of temperature and difference of pressure in different processes,mineralogy and viscocity of coherative phase with different additives, such as dolomite, titanium and vanadium oxides in sintering process. It was found that the original gas permeability of new acid pellet sintering process is prior to general sintering process ,but it becomes poorer in the sintering process because of the material fusion; The main cohesive phase is silicate with high viscosity, the viscosity of cohesive phase can be reduced and the metallurgical properties improved with the addition of TiO_(2) Cap_(2) and MgO in sinter. Based on these results, the measures are made and implemented in practical process. Satisfactory results were reached in JISCO sintering plant .
引文
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