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一、小引现代技术对钢的强度要求愈高,磷的危害就愈突出,因此高级钢种允许磷含量都很低。一般合金钢允许含磷≤0.02—0.035％,寒带用结构和建筑用钢已要求含磷≤0.01—0.015％,而超低磷钢甚至要求含磷≤0.001％。因此,为向炼钢车间提供低磷铁水,炉外去磷(或称铁水预脱磷)已成为生产发展的迫切需要。七十年代以后,各矿石出口国矿石含磷上升,最大的矿石进口国日本明确要求铁矿石含磷必须<0.06％,为此澳大利亚不得不将铁矿石粉碎酸浸去磷。另一方面日本等国也从技术战略考虑开始组织大规模的铁水去
First, the small lead generation technology on the higher the strength of steel, the more prominent the harm of phosphorus, so the high grade steel allows phosphorus content is very low. General alloy steel containing phosphorus ≤ 0.02-0.035%, cold with structure and construction steel has required phosphorus ≤ 0.01-0.015%, while the ultra-low-phosphorus steel even requires phosphorus ≤ 0.001%. Therefore, to provide low-phosphorus hot metal to the steelmaking plant, dephosphorization (or pre-dephosphorization of hot metal) has become an urgent need for production development. Since the 1970s, the ore ore in various ore-exporting countries has increased in phosphorus content. Japan, the largest importer of mineral ore, has demanded that iron ore be <0.06% of its phosphorus content. As a result, Australia had to leach iron ore to acidify it. On the other hand, Japan and other countries also started to organize large-scale hot metal to go from technical strategy considerations