在冬季为了加速水玻璃芯硬化速度,经过试验与生产证实,在芯砂中加入催硬剂硫酸亚铁后,硬化速度加快,成本降低,工效提高,并保证了铸件质量。一、硫酸亚铁作催化剂的机理硫酸亚铁化学分子式为FeSO_4,工业用品应选用白色粉末,能溶于水,不溶于醇。硫酸亚铁加入水玻璃芯砂中进行如下反应。 FeSO_4+Na_2O·mSiO_2→Na_2SO_4+mSiO_2+FeO…………(1) Na_2O·mSiO_2+CO_2→Na_2CO_3+mSiO_2+Q(热量)…………(2) In winter, in order to accelerate the hardening rate of water glass core, it is verified through trial production and production that after the hardner ferrous sulfate is added to the core sand, the hardening speed is accelerated, the cost is reduced, the work efficiency is improved, and the casting quality is guaranteed. First, the mechanism of ferrous sulfate catalyst Ferrous sulfate chemical formula for the FeSO_4, industrial supplies should use white powder, soluble in water, insoluble in alcohol. Ferrous sulfate was added to the water glass core sand for the following reaction. FeSO 4 + Na 2 O mSiO 2 → Na 2 SO 4 + mSiO 2 + FeO (1) Na 2 O · mSiO 2 + CO 2 → Na 2 CO 3 + mSiO 2 + Q (heat)