磷灰石及其变体交换吸附阴离子的模式

研究磷灰石及其变体交换吸附阴离子的模式，可丰富矿物的阴离子交换吸附理论。本文采用静态振荡法及动态往交换法详细研究了磷灰石及其变体与F-、CO32-、OH-的离子交换性能。研究结果表明，磷灰石及其变体与含有F-、CO32-、OH-的溶液作用时，溶液中的阴离子可与它们结构中的阴离子发生交换作用；预先用适当浓度的H2SO4溶液浸泡磷灰石及其变体，伴随着固相中少量PO43-及Ca2 的化学溶蚀作用，SO42-可进入磷灰石及其变体的结构中。磷灰石及其变体中非PO43-阴离子（例如F-、CO32-、OH-、SO42－）的存在，是它们具有阴离子交换性能的根源所在，且随着这些阴离子含量的增加，其离子交换容量也相应增加。

A MODEL OF ANION EXCHANGE-ADSORPTION FOR APATITE AND ITS VARIETY

The theory of anion exchange-adsorption of some minerals can be enriched by studyingthe model for anion exchange-adsorption for apatite and its variety. This paper studies in detail theanion exchange properties of apatite and its variety with F-,CO32- and OH- by means of static-modeshaking and dynamic-mode exchange columns. From the results it can be seen that:during the in-teraction 0f apatite and its variety with a solution containing F-,CO32- and OH-,the exchange oc-curred of anions in the s0lution with those in the structure of the apatite and its'variety. By soak-ing the apatite and its variety by sulfuric acid solution with a suitable concentration, small amountsof PO43- and Ca2 in the solid phase were chemically dissolved,following the entry of SO42- into thestructure of the apatite and its variety. It is the existence of non-PO"- anions (e. g. F-,CO32-,OH-,SO42-) that apatite and its variety have the capacity of anion-exchange, which tends to in-crease with the enhancement of anion concentrations-