Through analyzing for requirement of shell strength and various hardeners,good economical benefit has been achieved by using technology of NH4Cl and AlCl3 crystal mixed hardener with the same binder and refractory staff.

• 通过对型壳强度性能的要求与不同硬化剂的分析，在粘结剂和耐火材料不变的情况下，应用氯化铵与结晶氯化铝混合硬化工艺，取得较好的经济效果。