[특허]Process for the treatment of metal-containing water and recovery of metals therefrom

Buckman Laboratories International, Inc. (Memphis TN 02) Board of Regents of the University and Community College System of Nevada on behalf of the University of Nevada (Reno NV 02)

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Process for the treatment of metal-containing water and recovery of metals therefrom

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	C02F-001/62
미국특허분류(USC)	210/709 ; 210/719 ; 210/722 ; 210/724
출원번호	US-0181119 (1994-01-13)
발명자 / 주소	Misra Manoranjan (Reno NV) Kravetz Mark E. (Cote Madera CA) Yang Kang (Reno NV) McNeel Thomas E. (Memphis TN)
출원인 / 주소	Buckman Laboratories International, Inc. (Memphis TN 02) Board of Regents of the University and Community College System of Nevada on behalf of the University of Nevada (Reno NV 02)
인용정보	피인용 횟수 : 70 인용 특허 : 0

초록
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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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A process for the treatment of contaminated water and the recovery of spinel ferrite therefrom comprising: (a) precipitating and recovering from the contaminated water at least a portion of at least one non-ferrous or non-ferric metal precipitate in at least one metal precipitation stage, each metal precipitation stage being carried out at a pre-selected pH at which said metal precipitates from the water, each precipitation and recovery stage comprising: (i) adding to contaminated water containing iron at least one oxidizing agent to increase the oxidation-reduction potential of the water to a positive potential sufficient to convert iron in the contaminated water, to the ferric ion form wherein iron remains dissolved in the water at said pre-selected pH; (ii) adding aqueous acid or base or a mixture thereof to contaminated water or to the contaminated water having iron in the form of ferric ion in step (i) to adjust the pH of the water to said pre-selected pH at which precipitation of said at least one metal occurs in the presence of an organic or inorganic sulfur compound; (iii) adding a sufficient amount of at least one organic or inorganic sulfur compound or mixture thereof, said sulfur compound 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, to form a precipitate of said at least one metal in the contaminated water at the adjusted pH; and (iv) removing the precipitate of said at least one metal from the water to form an aqueous supernatant free of at least a portion of said at least one non-ferrous or non-ferric metal; (b) optionally precipitating and recovering aluminum from contaminated water containing aluminum or from aqueous supernatant containing aluminum formed in (a), in a metal precipitation stage wherein the precipitation is carried out at a pH of about 5 at which aluminum precipitates from the water or aqueous supernatant, comprising: (i) adding to contaminated water containing iron or aqueous supernatant containing iron at least one reducing agent to adjust the oxidation-reduction potential of the water or aqueous supernatant to a less positive or a negative potential sufficient to convert iron in the water or aqueous supernatant to the ferrous ion form wherein iron remains dissolved in the water or aqueous supernatant as a ferrous ion at the pH at which aluminum precipitate is formed; (ii) adding aqueous acid or base or a mixture thereof to the contaminated water or aqueous supernatant or to the water or aqueous supernatant having the iron in the form of ferrous ion of step (b)(i) to adjust the pH to about 5, thereby causing an aluminum precipitate to form; (iii) removing the aluminum precipitate from the water or aqueous supernatant to form an aqueous supernatant substantially free of aluminum; (c) precipitating iron and recovering spinel ferrite from the contaminated water or from the aqueous supernatant formed in (a) or (b) in a precipitation stage wherein the precipitation is carried out at a pH of about 9 to about 12 under controlled oxidation at which spinel ferrite precipitates from the water or aqueous supernatant, comprising: (i) adding to water containing iron or to an aqueous supernatant containing iron which does not have a less positive or a negative potential sufficient to maintain iron in the ferrous ion form, at least one reducing agent to adjust the oxidation-reduction potential of the water or aqueous supernatant to a less positive or a negative potential sufficient to convert iron in the contaminated water or the aqueous supernatant, to the ferrous ion form; (ii) adding a stoichiometric amount of water soluble ferrous salt to contaminated water or to an aqueous supernatant derived from contaminated water or to the water or aqueous supernatant of step (c)(i) having a less positive or a negative potential to provide a ferrous ion-containing water having a sufficient amount of ferrous ion to produce metal ferrite from metals dissolved in the ferrous ion-containing water; (iii) adding an amount of aqueous base to the ferrous ion-containing water sufficient to adjust the pH of the ferrous ion-containing water to about 9 to about 12; (iv) subjecting the ferrous ion-containing water having a pH of about 9 to about 12 to an oxidizer for a sufficient amount of time to form spinel ferrite precipitate; and (v) removing the spinel ferrite precipitate from the water to form water substantially free of metals.

이 특허를 인용한 특허 피인용횟수: 70

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Process for the treatment of metal-containing water and recovery of metals therefrom

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이 특허를 인용한 특허 피인용횟수: 70

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Process for the treatment of metal-containing water and recovery of metals therefrom

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이 특허를 인용한 특허 피인용횟수: 70

IPC 상위 출원인

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IPC 상세정보(version : 201201)

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