实验室钢液真空脱硫试验表明 ,组成为 6 5 %～ 85 %石灰和 1 5 %～ 35 %萤石的粉剂 ,粒度为 5mm以下 ,加入量在 3～ 8kg/t的条件下 ,可使初始硫含量为 0 0 0 35 %～ 0 0 0 6 5 %的钢液脱硫至 0 0 0 2 0 %以下 ,脱硫时间为 1 0～1 5min ,脱硫率在 6 0 %～ 80 %。 30 0tRH现场对管线钢的深脱硫试验表明 ,钢液平均初始硫含量为 0 0 0 30 %时 ,自转炉出钢至RH处理结束的脱硫效率平均可达到 4 6 7% ;RH处理结束钢水的平均硫含量为 0 0 0 1 6 %。 Laboratory molten steel vacuum desulfurization test showed that the composition of 65% ~ 85% lime and 15% ~ 35% of fluorite powder, the particle size of 5mm or less, the amount of 3 ~ 8kg / t conditions, the initial Desulphurization of molten steel with sulfur content of 0 0 0 35% ~ 0 0 0 6 5% to below 0 0 0 0 0 0 0 0 0 1 0 5 min, desulfurization rate 6 0% ~ 80%. The deep desulfurization test of pipeline steel at 30 0tR showed that the average initial sulfur content of the molten steel is 0 0 0 30%, the average desulfurization efficiency can reach 46.7% at the end of tapping from the converter to the end of RH treatment. The average sulfur content is 0 0 0 1 6%.