铑在常态下难溶于王水等强酸，使用酸性溶液对耐强酸基体的车用陶瓷催化转化器中铑的完全溶出非常困难。采用微波消解法，研究了消解过程中酸的用量比例、消解温度及消解时间对铑溶出率的影响。结果表明，酸的用量比例对铑的溶出率影响不明显，溶解时间和消解温度对铑的溶出有显著影响。通过单因素试验分析，建立了一种新型耐强酸陶瓷催化转化器中铑元素的微波消解溶出方法，在消解时间为60 min，消解温度为212℃的条件下，铑的溶出率提高了25%。
Rh is normally difficult to be dissolved by strong acid, such as aqua regia. It’s even harder to dissolve rhodium totally from the ceramic catalyst converter with acid tolerance. In the present paper, the microwave-assisted digestion method was introduced to deal with this problem. The digesting conditions including the acid ratio, temperature and time were tested and optimized in order to enhance the dissolution. The results showed that both the microwave temperature and time had significant effects on the rate of Rh dissolution, while the acid ratio exerted only minor effects. The rate of Rh dissolution was increased at a digesting temperature of 212℃ for 60 min by 25%, compared to that achieved by the conventional methods.
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