矿物—氨基酸水溶液的表面离子化及溶解作用研究

在矿物－氨基酸－水组成的多相体系中，矿物在氨基酸中的溶解作用是一个复杂的过程，其矿物的成分、结构和表面离子化是影响矿物溶解和络合的重要因素。水镁石、纤蛇纹石、硅灰石由于表面羟基化，在氨基酸水溶液中有较高的溶解度，溶解以配合作用为主；坡缕石、海泡石层状硅酸盐矿物表面羟基化作用较弱，与氨基酸的作用为配合作用和吸附作用并存，以后者为主；沸石矿物则以吸附作用为主。在中性氨基酸水溶液中，矿物的溶解度大小为：水镁石＞纤蛇纹石＞硅灰石＞海泡石＞坡缕石＞斜发沸石。

SURFACE IONIZATION AND DISSOLUTION OF MINERALS IN AMINO ACID SOLUTION

In the system of mineral-amino-water solution, the dissolution of fiber mineral dust is a complicated process that will be influenced obviously by the mineral's composition, structure and surface ionization. Brucite, chrysotile and wollastonite show great solubility and form complexes because of OH - ionization in water on the surface; surface OH - ionization of sepiolite and palygorskite is weaker, so the interface action between minerals and amino acid shows both adsorption and complexition, but mostly is adsorption. Clinoptilolite mainly shows adsorption. In neutral amino acid (valine), the sequence of dissolution rates of these fiber minerals is: brucite>chrysotile>wollastonite>sepiolite>palygorskite>clinoptilolite.