低温条件下长石溶解模拟实验研究

Simulated Experimental Study of Feldspar Dissolution in Low Temperature

为了研究有机酸和无机酸对长石的溶解能力以及不同有机酸对长石溶解能力的差异,笔者等在80℃条件下,在不同pH值(4、6和8)的分别含有盐酸、乙酸和草酸的溶液中,对碱性长石和斜长石进行了溶解模拟实验研究。实验结果表明:酸性(pH=4)和弱酸性(pH=6)条件下,乙酸对两种长石的溶解能力大于草酸,碱性条件(pH=8)下草酸的溶解能力最大,无论在酸性或碱性条件下,有机酸对长石的溶解能力均高于无机酸,酸性(pH=4)条件下,斜长石与碱性长石溶解量差别不大,在弱酸性(pH=6)和碱性(pH=8)条件下,斜长石的溶解量高于碱性长石。

In order to study the differences between the abilities of dissolution to feldspar of organic acids and inorganic acids and the differences between the abilities of dissolution to feldspar of different organic acids. Under conditions in the 80℃, Dissolution simulation study About alkali feldspar and plagioclase has been done in solution with different pH value （4, 6 and 8）, respectively, containing hydrochloric acid, acetic acid and oxalic acid. The experimental results show that： under the conditions of acid （pH = 4） and weak acid （pH = 6）, the dissolution ability of acetic acid to two kinds of feldspar is greater than oxalic acid. Under Alkaline conditions （pH = 8）, oxalic acid has the largest dissolution ability. Under either acid or alkaline conditions, the dissolution ability of organic acids to feldspar is greater than inorganic acid. Under acidic （pH = 4） conditions, dissolutions of plagioclase and alkaline plagioclase have little difference. Under the weak acid （pH = 6）, and alkaline （pH = 8） conditions, dissolution of plagioclase is higher than alkaline plagioclase.