粘土做为止水材料,广泛应用于水井钻凿成井工艺中。这种止水方法简单,原料来源方便,价格低廉。在防氟改水工作中,长期以来人们也选用粘土做为止水材料,隔离高氟水向低氟水窜入,结果不甚理想,从吉林省五个县1500多眼水井调查中,发现有55.3％的水井含氟量均比成井初期有不同程度的提高,超过了饮用水规定标准,不能继续饮用。 Clay as a water stop material, widely used in well drilling technology. This method of sealing water is simple, convenient source of raw materials, low prices. In the anti-fluoride water work, for a long time people also choose clay as the water-stop material, isolated high-fluorine water to flee into the low-fluorine water, the result is not satisfactory, from 1500 counties in Jilin Province five wells survey found that 55.3% of the wells have the fluorine content than the initial well have increased in varying degrees, exceeding the drinking water standards, can not continue to drink.