Dissolution of a complex borosilicate glass at 60 °C:: The influence of pH and proton adsorption on the congruence of short-term leaching

被引：0

作者：

Abraitis, PK ^{[1
]}

Vaughan, DJ ^{[1
]}

Livens, FR ^{[1
]}

Monteith, J ^{[1
]}

Trivedi, DP ^{[1
]}

Small, JS ^{[1
]}

机构：

[1] Univ Manchester, Dept Earth Sci, Manchester M13 9PL, Lancs, England

来源：

SCIENTIFIC BASIS FOR NUCLEAR WASTE MANAGEMENT XXI | 1998年 / 506卷

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D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The short-term dissolution behaviour of a complex borosilicate glass has been investigated by controlled pH leaching, surface titration and leach rate temperature dependence experiments. The results indicate that the rates, congruence and mechanisms of dissolution vary significantly with pH. At low pH, dissolution occurs via a proton-promoted mechanism which results in enhanced release of B and many network modifying elements (relative to Si). At 60 degrees C in high pH media, dissolution is essentially congruent. Here, dissolution is surface reaction controlled and occurs via a hydroxyl-promoted network dissolution process. Selective leaching is favoured at low and near-neutral pH. Congruent dissolution occurs in solutions of pH greater than that at the point of zero net proton charge.

引用

页码：47 / 54

页数：8