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CaO—Al_2O_3基重熔渣首次用于工业性炉外精炼是根据法国专利进行的,至今已50余年了。由于这种方法对提高钢的纯净度和机械性能很有好处,所以至今仍被广泛采用。最初的做法是在出钢时往钢罐内加入3％的重熔渣,渣的组成为50％CaO,45％Al_2O_3。这样做的主要目的是为了使钢水脱硫和去除夹杂。经过处理,钢中硫含量可降低到0.005％。现在法国、意大利、苏联、西德和奥地利等国均广泛采用这种方法处理钢水。 50年代末和60年代初,由于用该法处理钢水成本高,且对车间组织工作要求高,所以应用的不太广泛。60年代中叶,与应用粉状脱硫剂(例如TN、SL和CAB法等处理钢水)的同时,该法又被广泛采用。
For the first time, CaO-Al 2 O 3 -based heavy slag has been used in industrial furnace refining for more than 50 years according to the French patent. Since this method is very good for improving the purity and mechanical properties of steel, it is still widely used. The initial practice was to add 3% remelted slag to the steel can during tapping. The composition of the slag was 50% CaO, 45% Al_2O_3. The main purpose of doing so is to desulphurize and remove inclusions in the molten steel. After treatment, the sulfur content in the steel can be reduced to 0.005%. Nowadays, molten steel is widely used in such countries as France, Italy, the Soviet Union, West Germany and Austria. In the late 1950s and early 1960s, it was not widely used because of the high cost of treating molten steel by this method and the high requirements for work-shop organization. The mid-60s, and the application of powdered desulfurizer (such as TN, SL and CAB method of treatment of molten steel), while the law has been widely used.