Patents by Inventor Antonio Roca

Antonio Roca has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Process for improving the extraction yield of silver and gold in refractory ores
    Patent number: 4654079
    Abstract: A process for the extraction of silver and gold from refractory ore is disclosed. The process includes first grinding the refractory ore. This ground refractory ore is subsequently treated with an alkali solution of a stoichiometric excess amount of sulphide in relation to the amount of gold and silver contained in the refractory ore, to thus form a pulp containing a gold and silver sulfide. The pulp and alkaline solution ore are aerated to oxidize the excess sulfide to sulfate and then a mixture of the pulp and cyanide liquor are formed. Finally this mixture is aerated to obtain a final gold and silver product.
    Type: Grant
    Filed: March 5, 1985
    Date of Patent: March 31, 1987
    Assignee: Nunez, Roca, Espiell, Universidad de Barcelona
    Inventors: Carlos Nunez, Antonio Roca, Fernando Espiell