A process of the present invention comprises dissolving rhodium black in sulfuric acid under heating, making the pH of the said sulfuric acid solution neutral or basic by adding an alkaline solution to the said sulfuric acid solution to precipitate rhodium as rhodium hydroxide, separating the rhodium hydroxide and dissolving it in nitric acid. The process is useful for preparing the rhodium nitrate solution which is not decomposed by heating or concentration to produce turbidity, and produces almost no changes when it is allowed to stand at room temperature for a long period of time. Since the rhodium nitrate solution has the excellent heat-stability and endurance for long term storage, the said solution can be employed as a useful rhodium source which does not decompose for a variety of applications.
本发明的过程包括在加热下将黑色
铑溶解在
硫酸中,通过向
硫酸溶液中加入碱性溶液使该
硫酸溶液的pH值中性或碱性,以沉淀
铑为
氢氧化铑,分离
氢氧化铑并将其溶解在
硝酸中。该过程有助于制备不会在加热或浓缩过程中分解产生浑浊的
铑硝酸盐溶液,并且在室温下长时间放置时几乎不会发生变化。由于
铑硝酸盐溶液具有优异的热稳定性和长期储存耐久性,因此该溶液可用作不分解的有用
铑源,适用于各种应用。