| 摘要 |
<p>This invention is a chemical process for decomposing an aqueous complex precious metal salt into an insoluble oxide precipitate, which is altered to an anhydrous oxide or is reduced to a metal, comprising the neutralizing and changing of a primary inorganic acid solution to a secondary solution of formic acid, and decomposing the formic acid, by the addition of hydrogen peroxide, which produces carbonic acid, in which a precious metal salt precipitates as a hydrate oxide, which then is altered by heat to become an anhydrous oxide, or is reduced to a metal by mixing said hydrate oxide into a formic acid solution and boiling said mixture to dryness in an atmosphere, devoid of oxygen. This process is based on the novel consideration that inter-molecular water is integrally locked into the molecular structure of aqueous salts, which has applications in every aspect of wet-la b chemistry, particularly, the analyses and extraction of precious metals from aqueous ac id solutions.</p> |
