Method for preparing ruthenium powder
A powder and crude ruthenium technology, applied in the field of preparing ruthenium powder, can solve the problem of high oxygen content and achieve the effect of less pollution and high quality
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Embodiment 1
[0047] Embodiments of the present invention are described below. figure 1 A flowchart representing an example.
[0048] The copper electrolytic precipitate is chlorinated and volatilized in a chlorine atmosphere, and sodium chloride is added for chlorination roasting, and the platinum group metal is made into a soluble salt, which is dissolved in water to make an aqueous solution. Add sodium bromate therein, make ruthenium become volatile ruthenium tetrachloride and carry out distillation, recover in the form of ruthenium chloride in the hydrochloric acid solution of 6mol / L.
[0049] Add 1050 g of ammonium chloride to 7 liters of hydrochloric acid solution containing 50 g / L ruthenium, heat at 90° C. for 2 hours, cool to room temperature naturally, and filter the precipitated ammonium hexachlororuthenate crystals with filter paper.
[0050] The ammonium hexachlororuthenate was put into a container made of high-purity alumina, and kept at 600° C. for 2 hours in a nitrogen atmos...
Embodiment 2
[0060] In Example 2, ruthenium powder was prepared in the same manner as in Example 1, except that 5 vol% hydrogen-hydrogen mixed gas was used in the first-stage calcination, and the second-stage calcination temperature was changed to 900°C. 99% by mass or more of the ruthenium powder passed through the sieve with an opening of 500 μm, and 98% by mass passed through the sieve with an opening of 180 μm. The chlorine content in the ruthenium powder was as low as 35 mass ppm, and the salt was sufficiently decomposed. The oxygen content was 230 mass ppm, which was sufficiently removed. In addition, there are few metal components other than ruthenium, and high-quality ruthenium is obtained.
Embodiment 3
[0062] Example 3 Except that 5% by volume of hydrogen-hydrogen mixed gas was used during the calcination of the first stage, and the calcination temperature of the first stage was changed to 500° C., and the holding time was changed to 10 hours, and the calcination temperature of the second stage was changed to 800 DEG C, the retention time is changed to 5 hours, and the ruthenium powder is prepared in the same way as in Example 1.
[0063] 99 mass % or more of the ruthenium powder passes through a sieve with a mesh size of 500 μm, and 99 mass % or more passes through a sieve with a mesh size of 180 μm. The chlorine content in the ruthenium powder is as low as 85 mass ppm, and the salt is sufficiently decomposed. The oxygen content It was sufficiently removed at 300 mass ppm. In addition, there were few metal components other than ruthenium, and high-quality ruthenium was obtained.
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