在国内的铸造生产中,配制型砂所需的粘土粉一般有两条供应途径:一是将粘土块烘干、球磨,自行制粉;另一条是直接外购袋装粘土粉。大量流水生产的铸造厂往往采用自行制粉的方法。但由于这种方法存在工序复杂、投资高、占地面积大、易受气候条件的响影、不利于生产发展等问题,因而在建设新厂和改造老广中逐步被淘汰。 In the domestic foundry production, preparation of sand required clay powder generally has two supply channels: First, the clay block drying, milling, self-milling; the other is the direct purchase of bagged clay powder. Large-scale production of foundries often use their own method of milling. However, this method has been gradually phased out in the construction of new plants and the transformation of old Guang-Guang due to the complicated procedures, high investment, large area and vulnerability to climatic conditions and adverse developments in production.