戚墅堰机车车辆厂和上钢三厂将石灰石砂应用于铸钢工艺,对防止矽肺病发生,取得明显效果。戚墅堰机车车辆厂铸钢工艺,在1970年前使用含矽量高达96％的石英砂,12年间共发生矽肺病人35名,死亡9名。1970年以来,使用含矽约2％的石灰石砂,年产14000 Qishuyan rolling stock plant and the third plant on the limestone sand used in steel casting process, to prevent the occurrence of silicosis, and achieved significant results. Qishuyan Rolling Stock Works cast steel process, before the use of quartz containing up to 96% of silica sand in the past 12 years, a total of 35 patients with silicosis, 9 deaths. Since 1970, about 2% of limestone sand containing silicon has been used, with an annual output of 14,000