亚硫酸盐溶液是亚硫酸法造纸工厂的副产品,在苏联它是一种被广泛运用着的主要的坭芯粘结剂.我国铸造生产上所用的坭芯粘结剂,一般是桐油、豆油、糖浆、淀粉等,这些大都是比较昂贵的工业原料,或是日常不可缺少的食用品.随着社会主 Sulphite solution is a by-product of the sulphurous paper mill and in the Soviet Union it is a major co-binder used widely in the Soviet Union.Number core binders used in foundry production in our country are usually tung oil, soybean oil, Syrup, starch, etc., these are mostly more expensive industrial raw materials, or daily necessities .As the social