我厂在58年8～10月分内,用土铁浇铸的铸件连续产生严重的白口、炸裂、浇不到等现象。通过化验分析,土铁的含硫量高达0.4～1%以上。为了改变这种情况,我们采取了一些去硫的办法。在炉外用碳酸钠,在炉内加锰铁、石灰石和莹石进行脱硫。这样虽然铸件仍产生白口,但炸裂现象减少了,脱硫效果达到30～50%。后来由于没有灰口铁了,完全使用高硫白日铁熔铸,结果问题还很严重。以后我们根 I plant in 58 years from August to October, cast iron castings with iron continuous serious white mouth, burst, less than pouring and so on. Through laboratory analysis, soil iron sulfur content as high as 0.4 to 1%. In order to change this situation, we have taken some desulfurization measures. In the furnace with sodium carbonate, add ferromanganese in the furnace, limestone and fluorite for desulfurization. Although this castings still produce white mouth, but the phenomenon of burst reduced, desulfurization effect of 30 to 50%. Later, because there is no gray iron, the full use of high-sulfur cast iron day, the result is still very serious problems. After we root