材料期刊网

缚硫焦是在高硫炼焦煤中加入缚硫剂,使之“缚”住其中尽可能多的硫在炼铁时直接进入炉渣,减少生铁中硫的污染。用缚硫焦和高硫焦分别进行炼铁试验,结果表明:用缚硫焦在小高炉中炼出的铸造生铁,其合格率巳达到90％以上,取得的各项炼铁技术经济指标均显示出有一定的优越性。在炼铁试验中,曾分层从高炉中取出焦炭、矿石、熔剂、生铁和炉渣五种炉料的样品,经过大量分析,得出在分别用缚硫焦和高硫焦炼铁期间五种炉料中沿高炉高度方向的含硫量变化,从而比较清楚地掌握了硫在高炉内的活动规律。这对进一步研究提高缚硫效果以及生铁的硫化和脱硫机理,有一定的意义。

A high-sulphur-containing coking coal was mixed with alkaline material in order to"fix" its certain amount of sulphur after coking, such coke has been called the "fixing-sulphur" coke. This and another "high-sulphur" coke made from same coal were sepa-rately used in ironmaking under similar conditions for comparison. It was found thatthe "fixing-sulphur" coke showed better properties in ironmaking than the high-sulphurcoke in terms of all technological and economical indices. With "fixing-sulphur" coke,the contamination of sulphur was much less serious, 90％ of pig iron to be casting pro-duced up to the recognized standard. Samples of coke, ore, flux, molten iron and slag were taken from different positionsof blast furnace for sulphur analysis, a diagram of sulphur variation along longitudinaldirection of blast furnace was plotted. Such a diagram may help to control blast furnaceoperation from the point of view of sulphur elimination, although much further investi-gation will be needed in this direction.