Aqueous solutions containing metal cyanide for cyanide leaching for the winning of gold and silver

    公开(公告)号:NZ570143A

    公开(公告)日:2010-07-30

    申请号:NZ57014307

    申请日:2007-01-22

    Applicant: BASF SE

    Abstract: Disclosed is a process for the preparation of solutions comprising water and at least one metal cyanide, comprising (i) reaction of hydrogen cyanide or hydrogen cyanide-containing gasses with a solution comprising at least one metal hydroxide and/or metal oxide and/or mixed oxide and water and (ii) optionally, dilution of the solution obtained in step (i) with water, wherein in step (i) at least a part of the water being obtained from wastewater which occurs as depleted wastewater in a process for extracting noble metals from noble metal-containing ores by the cyanide process.

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