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When it comes to palladium oxide, it must be relatively unfamiliar to everyone, so the next platinum palladium rhodium refining factory in Zhengzhou, China Jinquan for you to talk in detail about the palladium oxide fire refining raw materials, hurry to follow us to understand it.
Palladium oxide has the ability not to be easily oxidized, in the presence of metallic lead, palladium oxide can be dissolved in the molten metallic lead at a lower temperature to form an alloy. And copper, bismuth, rhodium and other metals have a strong affinity for oxygen compared to palladium oxide, so you can pass oxygen into the molten silver, so that the base metal impurities oxidation, and then in the form of oxide to make slag or volatile removed, while lead is formed lead oxide volatile, to get color in 95% to 99% of palladium oxide.
The raw material for fire refining of palladium oxide is mainly crude silver or precious lead (i.e. alloy of precious metal and lead, as lead is a good trapping agent for precious metal, in the process of melting, the precious metal is dissolved in the lead solution to form an alloy of lead and precious metal). The order of oxidation of each metal in lead is: rhodium, arsenic, lead, bismuth, copper, tellurium, selenium, rhodium, silver.
The difficulty of oxidation is also related to its content. Lead oxidizes first in noble lead, and as palladium oxide passes oxygen to arsenic, antimony and other metals to oxidize, its low-valent oxides volatilize into the flue gas, and the high-valent oxides and alkaline oxides cause slag. Bismuth in arsenic, antimony volatilization late start oxidation, and then add sodium nitrate or potassium nitrate to make copper, bismuth, tellurium and other slag.
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