Method for producing leather
    33.
    发明专利

    公开(公告)号:NZ710857A

    公开(公告)日:2020-09-25

    申请号:NZ71085714

    申请日:2014-02-12

    Applicant: BASF SE

    Abstract: A method of producing leather comprising a plurality of steps, wherein methanesulfonic acid is used in at least one step selected from deliming, and wherein the pH in the deliming step is provided to be between pH 4 and 9. The methane sulfonic acid may be used in the form of a mixture with salts and/or other acids and/or acid derivatives such as e.g. ammonium sulfate. The leather product is preferably a chrome-tanned leather. The invention thereby aims to provide soft and attractive leathers and is efficient in practice.

    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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