To understand the running condition of defluoridation projects and fluorite concentration in drinking-water in Zhangjiakou City.

Preparation of water purifying agent from analcite rocks and study on its fluorine removal;

The influences of activation method of active magnesium oxide, activating conditions, generation conditions, fuorine absorbing capcity and various technological factors on fluorine removal were studied.

A fluorine removal method with water glass is described for a typical weak acid scrubbing system in an arrangement of empty tower-packed tower-two stage wet electrostatic precipitator,with emphasis on theoretic cal- culation of water glass addition amount,matters needing attention during operation,equipment running manage- ment and how to deal with system blocking.

Research of the treatmented zeolite and modification D401 resin removing fluorine;

Study of test of removing fluorine by model-Alstrong aeid cation exchange resin;

Using zeolite 5A° for carrier to adsorb Fe3+from solution of FeCl3,which the zeolite can be modified,modified zeolite′s properties of removing fluorine from water including fluoride was reported,and a new material of removing deeply fluorine based on ligand exchange and separation of solid-liquid was got.

Experimental study on defluorination of milk of lime replaces alcium chloride;

The process of coagulation defluorination with alumin-um sulfate is discussed, and the pH is 6.

Comparison of defluorination effect by bamboo charcoals with different manufactories was conducted in this study.

Study of technological conditions for fluoride removal from fluoride-containing wastewater in aluminum industry;

Discussion on technologies of fluoride removal from drinking water;

Effect of fluoride removal of modified activated alumina;