Synthesis method of platinum nitrate solution
A synthesis method and technology of platinum nitrate, applied in the field of preparation process of platinum nitrate solution, can solve the problems of nitrogen oxide emission, low removal rate of impurities in platinum nitrate, incomplete removal of nitrate, etc.
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Embodiment 1
[0023] Preparation of nitric chloride-free platinum acid: put 10g of platinum powder in a flask, add platinum powder: aqua regia = 1g: 4.5mL, add aqua regia and start stirring, keep the temperature at 50°C to start the dissolution reaction, stop heating after 3 hours, and cool After reaching room temperature, 30% sodium hydroxide solution was added to the obtained first product under stirring condition, and the pH value of the solution was adjusted to 10. Then at 40°C, hydrazine hydrate solution was slowly added dropwise thereto to obtain the supernatant as a colorless and transparent solid-liquid mixture. After filtering and washing until the conductivity of the filtrate was 7 μs / cm, the filter cake was taken with deionized water. Thoroughly stir and mix evenly, remove the filtrate by suction filtration, and repeat washing like this for 5 times until the conductivity of the filtrate is 7 μs / cm. The obtained filter cake was mixed evenly with 120mL of 36% hydrochloric acid, dis...
Embodiment 2
[0028] Preparation of nitric-free chloroplatinic acid: put 10g of platinum powder in a flask, add aqua regia according to platinum powder: aqua regia = 1g: 6mL and start stirring, keep the temperature at 50°C to start the dissolution reaction, stop heating after 3 hours, and cool to After room temperature, 30% sodium hydroxide solution was added to the obtained first product under stirring condition, and the pH value of the solution was adjusted to 10. Then, at 60°C, hydrazine hydrate solution was slowly added dropwise thereto, and the supernatant obtained was a colorless and transparent solid-liquid mixture, which was filtered and washed until the conductivity of the filtrate was 10 μs / cm, and then the filter cake was taken. The obtained filter cake was mixed evenly with 120mL of 36% hydrochloric acid, dissolved and reacted with 100mL of 30% hydrogen peroxide at 50°C to obtain a chloroplatinic acid solution, filtered, and the filtrate was evaporated and concentrated for 2 hour...
Embodiment 3
[0033] Preparation of nitric-free chloroplatinic acid: put 10g of platinum powder in a flask, add aqua regia according to platinum powder: aqua regia = 1g: 8mL and start stirring, keep the temperature at 50°C to start the dissolution reaction, stop heating after 3 hours, and cool to After room temperature, 30% sodium hydroxide solution was added to the obtained first product under stirring condition, and the pH value of the solution was adjusted to 10. Then, at 60°C, hydrazine hydrate solution was slowly added dropwise thereto, and the supernatant obtained was a colorless and transparent solid-liquid mixture. After filtering and washing until the conductivity of the filtrate was 8 μs / cm, the filter cake was taken. The obtained filter cake was mixed evenly with 100 mL of 36% hydrochloric acid, dissolved and reacted with 120 mL of 30% hydrogen peroxide at 40°C to obtain a chloroplatinic acid solution, filtered, and the filtrate was evaporated and concentrated for 2 hours to obtai...
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