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    Process for the treatment of metal-containing water and recovery of metals thereofrom
    1.
    发明专利
    Process for the treatment of metal-containing water and recovery of metals thereofrom 未知

    公开(公告)号：AU1210199A

    公开(公告)日：1999-03-25

    申请号：AU1210199

    申请日：1999-01-15

    Applicant: BOARD OF REGENTS OF THE UNIVERSITY AND COMMUNITY COLLEGE SYSTEM OF NEVADA THE ,  BUCKMAN LABOR INC

    Inventor： MISRA MANORANJAN ,  MCNEEL THOMAS E ,  YANG KANG ,  KRAVETZ MARK E

    IPC: C02F1/58 ,  C01G49/00 ,  C02F1/62 ,  C02F1/64 ,  C02F1/66 ,  C02F1/70 ,  C02F1/72 ,  C02F9/00

    Abstract: Metals contained in various wastewaters are selectively recovered as metal precipitates and/or as spinel ferrite and water suitable for discharge into the environment is obtained. High grade magnetic spinel ferrite is recovered from wastewaters having aluminum and arsenic if present in the wastewater, removed from the wastewater. There are three process stages for the treatment of wastewater. In the first process stage which is optional, at least a portion of at least one non-ferrous or non-ferric metal is precipitated from the wastewater by subjecting the wastewater to an oxidizing agent to increase the oxidation-reduction potential of the water, by adjusting the pH of the wastewater to a pH at which the metal precipitates from the water and by adding an organic or inorganic sulfur compound, capable of causing the metal to form a precipitate, to the water in a quantity sufficient to precipitate the metal. When aluminum is present in the wastewater, aluminum is recovered from the water by adding a reducing agent to lower the oxidation-reduction potential of the water and by adjusting the pH of the water to about 5. The aluminum which precipitates in the aqueous solution, is removed from the water. In the third precipitation stage, iron is recovered as spinel ferrite in an ambient temperature process by adding a reducing agent to the water, adding a soluble ferrous salt to the water, adjusting the pH to about 9-12 and oxidizing the water with an oxidizer, e.g., air, to form spinel ferrite. If aluminum and/or arsenic are present in the wastewater and are removed from the wastewater by the process, high grade magnetic spinel ferrite is recovered.

    COMPOSITION AND PROCESS FOR REDUCING OR PREVENTING METAL AND ACID CONTAMINATION IN ROCK DRAINAGE
    8.
    发明专利
    COMPOSITION AND PROCESS FOR REDUCING OR PREVENTING METAL AND ACID CONTAMINATION IN ROCK DRAINAGE 未知

    公开(公告)号：CA2179531A1

    公开(公告)日：1995-07-06

    申请号：CA2179531

    申请日：1994-12-16

    Applicant: BUCKMAN LABOR INC

    Inventor： KRAVETZ MARK E ,  MCNEEL THOMAS E

    IPC: A62D3/33 ,  A62D101/43 ,  B09B3/00 ,  B09C1/08 ,  C09K3/00 ,  A62D3/00

    Abstract: The formation of contaminants in drainage from waste rock or tailings is reduced or prevented by contacting the waste rock or tailings with an organic or inorganic sulfur compound in combination with a neutralizing agent, a fixating agent or a neutralizing agent and a fixating agent. When an organic or inorganic sulfur compound is used with the neutralizing agent or fixating agent, the amount of neutralizing agent and or the amount of fixating agent required to reduce or prevent the formation of contaminants in drainage from waste rock or tailings is substantially reduced. The amount of sulfur compound applied to the waste rock or tailings can be about 1 % to 5 % by weight and the amount of neutralizing agent and or fixating agent applied to the waste rock or tailings can be about 1 % to about 15 % by weight, based on the weight of the waste rock or tailings. The organic or inorganic sulfur compounds are those having a sulfhydryl group or an ionized sulfhydryl group or a sulfur compound which is capable of producing a sulfhydryl group or an ionized sulfhydryl group.

    10.
    发明专利
    未知

    公开(公告)号：BR9506517A

    公开(公告)日：1997-09-09

    申请号：BR9506517

    申请日：1995-01-12

    Applicant: BUCKMAN LABOR INC ,  BOARD REGENTHE UNIVERSITY OF N

    Inventor： MISRA MANORANJAN ,  KRAVETZ MARK E ,  YANG KANG ,  MCNEEL THOMAS E

    IPC: C02F1/58 ,  C01G49/00 ,  C02F1/62 ,  C02F1/64 ,  C02F1/66 ,  C02F1/70 ,  C02F1/72 ,  C02F9/00

    Abstract: Metals contained in various wastewaters are selectively recovered as metal precipitates and/or as spinel ferrite and water suitable for discharge into the environment is obtained. High grade magnetic spinel ferrite is recovered from wastewaters having aluminum and arsenic if present in the wastewater, removed from the wastewater. There are three process stages for the treatment of wastewater. In the first process stage which is optional, at least a portion of at least one non-ferrous or non-ferric metal is precipitated from the wastewater by subjecting the wastewater to an oxidizing agent to increase the oxidation-reduction potential of the water, by adjusting the pH of the wastewater to a pH at which the metal precipitates from the water and by adding an organic or inorganic sulfur compound, capable of causing the metal to form a precipitate, to the water in a quantity sufficient to precipitate the metal. When aluminum is present in the wastewater, aluminum is recovered from the water by adding a reducing agent to lower the oxidation-reduction potential of the water and by adjusting the pH of the water to about 5. The aluminum which precipitates in the aqueous solution, is removed from the water. In the third precipitation stage, iron is recovered as spinel ferrite in an ambient temperature process by adding a reducing agent to the water, adding a soluble ferrous salt to the water, adjusting the pH to about 9-12 and oxidizing the water with an oxidizer, e.g., air, to form spinel ferrite. If aluminum and/or arsenic are present in the wastewater and are removed from the wastewater by the process, high grade magnetic spinel ferrite is recovered.

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