Determination of barium in copper anode slime by idometry combined with alkali fusion and barium chromate precipitation separation
LIU Fangmei, HUANG Yajuan
Zijin Copper Co., Ltd., FuJian Key Laboratory for Green Production of Copper and Comprehensive Utilization of Associated Resources, Shanghang 364204, China
Abstract：The content of barium in copper anode slime is one of the important technical indexes in the process of recovering precious metals from copper anode slime by Kaldor furnace, which directly affect the recoveries of precious metals such as gold and silver. The sample was treated in nickel crucible by alkali fusion with the mixed flux of sodium hydroxide and sodium carbonate. The refractory barium sulfate was converted into barium carbonate which could be easily dissolved in hydrochloric acid. After treatment by hot water leaching and filtration, the filtrate was abandoned so that most of the interfering ions were removed. The precipitate was dissolved with hydrochloric acid. Then masking agent of EDTA-calcium salt (CaY2-) was added to mask these ions such as iron, aluminum, lead, copper, nickel and zinc. Potassium dichromate was added to react with barium ion to form barium chromate precipitate, realizing the separation of barium from other impurities. The barium chromate precipitate was dissolved with hot hydrochloric acid (1+9) in the original beaker. The content of barium in sample was indirectly determined by iodometry. Thus, a method for determination of barium in copper anode slime was established by iodometry with alkali fusion and barium chromate precipitation separation. The experimental results showed that 0.50 g of copper anode slime sample could be completely decomposed with 6 g of the mixed flux of anhydrous sodium carbonate and sodium hydroxide (mass ratio of 1∶2) at 700 ℃ for 30 min. The effects of overnight aging at room temperature and aging in water bath at 95 ℃ for 2-3 h on the determination of barium were compared. It was found that the determination results of two methods were basically the same. The interference test showed that the interference of coexisting elements in the sample could be ignored. The contents of barium in copper anode slime samples were determined according to the proposed method. The relative standard deviations (RSD, n=7) of determination results were between 0.23% and 2.0%, and the recoveries were between 99% and 101%. Inductively coupled plasma atomic emission spectrometry (ICP-AES) was used for method comparison, and the determination results of the two methods were basically consistent.
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