A process for the treatment of electric and other furnace...

C - Chemistry – Metallurgy – 22 – B

Patent

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Details

C22B 3/06 (2006.01) C22B 3/20 (2006.01) C22B 3/46 (2006.01) C22B 7/02 (2006.01) C22B 11/00 (2006.01) C22B 19/30 (2006.01)

Patent

CA 2590927

The present invention is a method of recovering valuable metals from a quantity of furnace dust consisting the following steps. A first leaching step wherein the furnace dust is leached at atmospheric pressure in a first leaching solution to produce a first leach liquor and a first leach residue, the first leaching solution consisting of an aqueous mineral acid solution. The first leach liquor is then separated from the first leach residue. A second leaching step is then performed wherein the first leach residue is atmospherically leached in a second leaching solution to form a second leach liquor and a second leach residue, the second leaching solution comprising a solution of aqueous HCl with a reductant. The second leach liquor is then separated from the second leach residue. A zinc precipitation step is then performed wherein zinc is precipitated from the second leach liquor by treating the second leach liquor with a quantity of alkali, the quantity of alkali selected to adjust the pH of the second leach liquor sufficiently to precipitate out the zinc in the form of a zinc salt in a third residue leaving a third liquor and then separating the third residue containing zinc from the third liquor.

Procédé de récupération de métaux précieux dans une quantité de poussières de four : première lixiviation sous pression atmosphérique en première solution donnant une première liqueur et un premier résidu, la première solution étant une solution aqueuse d'acides minéraux ; séparation première liqueur/premier résidu ; seconde lixiviation, atmosphérique, sur premier résidu en seconde solution donnant une seconde liqueur et un second résidu, la seconde solution comprenant une solution de HCl aqueux et un réducteur, puis séparation seconde liqueur/second résidu ; précipitation de zinc depuis la seconde liqueur par traitement avec une certaine quantité d'alcali déterminée pour ajuster suffisamment le pH de la seconde liqueur en vue d'une précipitation du zinc sous forme de sel de zinc dans un troisième résidu, ce qui donne une troisième liqueur, puis séparation troisième résidu/troisième liqueur.

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