在“鞍钢宪法”光辉照耀下,我车间自1973年元月起,在中小件上推广应用了水玻璃粘土自硬砂,产品质量和效率都有较显著的提高。1974年2月起又学习上海地区先进经验,应用石灰石砂作原砂,配制水玻璃粘土自硬砂(以下简称石灰石粘土自硬砂)。通过几个月的实践,取得了较好的效果。四个多月中,已用石灰石粘土自硬砂生产了一千多吨铸钢件。一、特点用石灰石砂作原砂代替硅砂,消除了硅尘 In the “Anshan Iron and Steel” brilliant shining, my workshop since January 1973, small and medium-sized pieces of the promotion and application of water glass clay self-hardening sand, product quality and efficiency have a more significant increase. February 1974 and learn from Shanghai advanced experience, the application of limestone sand as raw sand, preparation of water glass clay self-hardening sand (hereinafter referred to as limestone clay self-hardening sand). Through a few months of practice, achieved good results. In more than four months, more than 1,000 tons of steel castings have been produced from hard sand using limestone clay. First, the characteristics of limestone sand as raw sand instead of silica sand, eliminating the silica dust