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Empresa Auxiliar de la Industria SA
Original Assignee
Empresa Auxiliar de la Industria SA
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Filing date
Publication date
Application filed by Empresa Auxiliar de la Industria SAfiledCriticalEmpresa Auxiliar de la Industria SA
Priority to ES540604ApriorityCriticalpatent/ES540604A0/en
Publication of ES8602546A1publicationCriticalpatent/ES8602546A1/en
Publication of ES540604A0publicationCriticalpatent/ES540604A0/en
The process is carried out in two phases: (a) lixiviation with inorganic acid, e.g. sulphuric, hydrochloric or mixts. in amount of 0.05-0.7 kg acid per kg sludge. The solid/liquid ratio in the reactor is 1/1 to 1/20, and the time is 0.5-4 h; (b) alkaline pptn. of the dissolved metals in the supernatant acid by treatment with NaOH, KOH or Ca(OH)2 to give pH 8-12. The ppted metal hydroxides are separated by filtration, leaving an aq. lye which can be used in washing the lixiviated sludge or in the actual lixiviation process.
ES540604A1985-02-211985-02-21
PROCEDURE FOR THE DEMETALIZATION OF URBAN AND INDUSTRIAL WATER TREATMENT SLUDGE.
GrantedES540604A0
(en)
Removal of organic and inorganic carbonaceous materials from zinc silicate flotation concentrate and having additional effect of purifying the magnesium and water in process of zinc production
Method for extraction of nickel and/or cobalt from nickel and/or cobalt oxide ores by heap leaching with a dilute sulphuric acid solution, prepared from sea water, at ambient temperature