论文部分内容阅读
一些文献报告用投加磷酸钙、磷酸及氢氧化钙降氟,或用磷酸钙、焦磷酸钙等制成滤料除氟;1979年美国ANDCO提供新的磷酸钙降氟法及相应成套设备,但在我们的重复实验中表明,该法降氟效果亦不甚满意。作者参考以往文献对磷酸钙降氟改水的一些步骤进行了改进。结果表明:改进后磷酸钙改水法降氟效果可靠、费用低廉、设备简单、便于操作、易于在广大城乡推广应用。
Some literature reports using dosing calcium phosphate, phosphoric acid and calcium hydroxide fluoride, or with calcium phosphate, calcium pyrophosphate filters made of fluoride; in 1979 the United States ANDCO provide new calcium phosphate fluoride method and the corresponding complete sets of equipment, However, in our repeated experiments show that the method of fluoride effect is not satisfactory. The author made reference to the previous literature to improve some steps of water-reducing calcium phosphate by water. The results show that the improved calcium phosphate water method has the advantages of reliable fluoride reduction, low cost, simple equipment, easy operation and easy popularization and application in the vast urban and rural areas.