Immobilizated Technique of Harmful Metallic Element by Crystalline Ziroconium Phosphate

在250 ℃高压釜中，将HZr_2（PO_4）_3与金属元素（Mn，Cu，Zn，Cd，Pb）的溶液混合24小时，以防止有害金属元素的固定。固定化速率随固定化金属元素离子半径的增大而增大。固定化产物在去离子水和1 mol·dm ^ -HCl中160°C时有害金属元素的浸出率<-3>&lt; 10^<-6>gm·<-2>d^<-1>和&lt; 10^<-4>gm·<-2>d^<-1>。此外，还将本方法应用于常规技术难以固定的放射性废物Cs、Sr和稀土元素的固定化，以及其它已知的环境污染源元素的固定化。初步实验表明，HZr_2（PO_4）_3能有效地固定这些元素。

MIXTURES OF HZr_2(PO_4)_3 WITH THE SOLUTION OF METALLIC ELEMENT ( Mn, Cu, Zn, Cd AND Pb) WERE TREATED AT 250°C 24 HOURS IN AN AUTOCLAVE, IN ORDER TO INVESTIGATE THE IMMOBILIZATION OF HARMFUL METALLIC ELEMENTS. THE IMMOBILIZED RATE INCREASED WITH AN INCREASE OF IONIC RADIUS OF THE IMMOBILIZED METALLIC ELEMENT. THE HARMFUL METALLIC ELEMENT LEACHING RATES OF IMMOBILIZED PRODUCTS IN DEIONIZED WATER AND 1 mol-dm^<-3> -HC1 AT 160°C < 10^<-6> gm^<-2> d^<-1> AND < 10^<-4> gm^<-2> d^<-1>. FURTHERMORE, THE APPLICATION OF THE PRESENT METHOD WAS TRIED FOR THE IMMOBILIZATION OF Cs, Sr AND RARE-EARTH ELEMENTS WHICH ARE THE RADIOACTIVE WASTES AND ARE DIFFICULT TO IMMOBILIZE BY THE CONVENTIONAL TECHNIQUES, AND FOR THE IMMOBILIZATION OF OTHER ELEMENTS KNOWN AS THE SOURCES OF AN ENVIRONMENTAL POLLUTION. PRELIMINARY EXPERIMENTS REVEALED THAT THESE ELEMENTS WERE EFFICIENTLY IMMOBILIZED IN HZr_2(PO_4)_3.