Concrete implementation way of example A waste for tantalum block for making high purity tantalum ingot, the method of this method through the following steps in turn A, dispensing IVol. % 500 ml of nitric acid solution, to join the 5 - IOVol. % of hydrogen peroxide solution 500 ml, add 500 ml water, after the blending basin, stir and pour into cleaning solution volume occupied half of the wash basin volume can be, then pour waste tantalum block were solution soak live, pay attention to turn with the spatula stir constantly, about I hour replaceable soaking solution, the replacement sample taken after 10 to 15 times, The waste tantalum shall be washed with clean water after the manganese content is lower than 200ppm, and the waste tantalum shall be taken out and dried after changing water for 5-10 times. B. Put the washed and dried scrap tantalum into a vacuum furnace and heat it under the vacuum degree ICT2Pa.
After the temperature rises to 800°C, it is held for 2 hours to remove impurities with the invention discloses a method for preparing high purity tantalum ingots from scrap tantalum, which is characterized in that the method goes through the following steps successively to remove manganese by repeatedly soaking in dilute nitric acid solution containing hydrogen peroxide, and then washing and drying after the manganese content is lower than 200PPm. The dried scrap tantalum is heated to 800℃ in a vacuum furnace at 10-2pa and kept for 2 hours. Hydrogen at 0.1 atmosphere is filled into the furnace to make the scrap tantalum absorb hydrogen and break naturally. After sifting the broken scrap tantalum, add the required components and mix the powder according to the test results. The tantalum bar is purified by the internal ingot in the electronic bombarding furnace.
The scanning mode of the electronic bombarding furnace is progressive circular scanning from large circle to small circle and from outside to inside. The advantages of the invention have relatively little impact on the environment. The recovery of tantalum bar is improved and the purity can reach 99.9% -- 99.99%.
