The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 10, 2009
Filed:
Apr. 25, 2006
Jaakko Poijärvi, Ulvila, FI;
Raimo Nupponen, Espoo, FI;
Tuula Mäkinen, Espoo, FI;
Jaana Romppanen, Helsinki, FI;
Jaakko Poijärvi, Ulvila, FI;
Raimo Nupponen, Espoo, FI;
Tuula Mäkinen, Espoo, FI;
Jaana Romppanen, Helsinki, FI;
Outotec Oyj, Espoo, FI;
Abstract
The invention relates to a method for the treatment of material containing at least one valuable metal and arsenic to form a valuable metal-depleted scorodite sediment and a pure aqueous solution to be discharged from the process. According to the method, the valuable metals are first removed from the material to be treated and then arsenic precipitation from the solution is performed in two stages. By means of the method, the aim is to obtain as low a valuable metal content as possible in the scorodite sediment that will be formed. Likewise, the arsenic and valuable metal content of the aqueous solution that is formed during arsenic precipitation also remains so low that the water can be released into the environment.