| 摘要 |
A fast and efficient industrial scale process for producing metal nitrate solutions by metal dissolution using nitric acid which overcomes NO gas treatment requirements by reacting the NO gaseous by-products with oxygen within the reaction vessel. The method is particularly useful for copper, silver, indium and thallium nitrate production. The process comprises provision of the said metal in solid particulate form, provision of nitric acid in aqueous solution, reaction of the metal with the nitric acid in a reaction medium having a headspace containing oxygen, where the metal particles are agitated in the nitric acid by means of an impeller to produce a turbulent admixture of the nitric acid with the headspace containing oxygen, the headspace being maintained above atmospheric pressure, and being replenished with gaseous oxygen to maintain a headspace oxygen concentration of 21% or greater by volume, the temperature being maintained in the range 20 deg C to the boiling point of the nitric acid. |
