• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Mercury and mercury salts are removed from liquid effluents (which may also comprise muds and inert products in suspension) by reacting the liquid effluents, at a pH of from 9 to 14, with thiourea or a hydroxylamine salt, and subsequently separating the resulting precipitate, together with muds and inert products, if any, by clari-flocculation.
    公开号:SU865124A3
    申请号:SU742048216
    申请日:1974-08-06
    公开日:1981-09-15
    发明作者:Патрон Германо；Наполи Доменико；Нардоне Франко；Ратти Джанлуиджи；Турбиелло Джузеппе
    申请人:Монтэдисон С.П.А.；
    IPC主号:
    专利说明:

    The invention relates to the treatment of industrial wastewater and can be used for wastewater treatment containing mercury and its inorganic 5 compounds.
    A known method of purification of aqueous solutions from mercury "in which it is in finely divided or colloidal form, or in the form of inorganic | θ compounds, including treatment with a reducing agent, such as D-glucose, hydroxylamine hydrochloride, hydrazine or sodium boride at pH 11, and the separation of finely divided or colloidal mercury by multi-stage distillation with * 5 followed by its separation from condensate [1].
    However, this method does not provide water purification from insoluble inorganic mercury compounds in it, which are suspended in the wastewater. Therefore, when processing industrial wastewater in this way, an additional 25 steps are required - converting insoluble compounds into soluble ones using a suitable reagent and decomposing the excess this reagent using another. Additional stages of the case - 30. 2
    The method is more complex and the number of reagents used is increased. To implement this method, acid and hypochloride are needed to convert insoluble compounds into soluble, sodium bisulfide to bind free chlorine, alkali to neutralize the acid and a reducing agent.
    The aim of the invention is to simplify the treatment of wastewater from mercury and its inorganic compounds and reduce the consumption of chemicals.
    This goal is achieved by the fact that waste water containing mercury and its inorganic compounds is treated with a thiourea chemical reagent at a pH of 10-12, and then mercury is separated by flocculation.
    Thiourea is preferably added in an amount of 0.38-3 g per 1 g of mercury.
    As flocculant use ferric chloride in an amount of 10,200 g per 1 m ^ wastewater and polyacrylamide in an amount of 0.1-10 g per 1 m e wastewater.
    Thiourea, when supplied to water containing mercury and its inorganic compounds, acts as a precipitating reagent, forming insoluble mercury compounds. The optimum pH value of water at which mercury is precipitated is 10-12.
    Flocculation provides an effective separation of mercury and its compounds in suspension in water.
    The method is as follows.
    Wastewater containing mercury, along with sludge and inert products, if necessary, alkalinized to a pH of 10-12, adding a solution of caustic soda. After that, the wastewater is treated with an aqueous solution of thiourea and incubated. Then the water is fed into the clarification apparatus, to which flocculants are added ferric chloride and polyacrylamide. The alkaline medium causes an instant precipitation of iron hydroxide with the formation of flakes, the thickening of which increases with the addition of polyacrylamide. Separation of mercury can be improved by adding bentonite clays as a partial substitute for ferric chloride (40-60% of ferric chloride can be replaced by an equal amount of bentonite clay). As a result of this, inert products, metallic mercury, and its salts precipitated in waste water fall into the hydroxide flakes formed during flocculation, which are removed after precipitation from the bottom of the clarification apparatus.
    PRI me R 1. Cleaning is subjected to wastewater composition:
    The total amount of mercury is g / m 3 6 Ionic mercury, g / m 3 3,5 Chlorine, g / m 3 10 Suspended particles (calcium hydroxide,iron, basic carbonatemagnesium, silicon oxide, silicates), g / m 3 200 Sodium chloride, kg / m 3 19000 Caustic soda, kg / m 3 3000 PH 11.3 Temperature ° C 20 Ί
    m 3 reaction with thiourea, which 45
    Wastewater is fed at a rate to the rue and sent to the reactor at a rate of 10 g / m in the form of a 5% solution. The amount of added urea G, 67 g per 1 g of total mercury. After 8 hours of reaction, water is sent to a mercury separation apparatus · flocculation, where ferric chloride and polyacrylamide PRESTOL 2953/74 are fed
    VNIIIPI. Vygrurtuti. subject
    200 19000 3000
    11.3
    11a, the concentration of residual mercury in the drain fluid is 0.02-0.04 parts per thousand parts of water; the sludge contains 2.4%
    PRI me R 2. Wastewater treatment composition. The total mercury content, g / m 3
    Ionic mercury, g / m $ Chlorine, g / m 3
    Suspended particles (calcium and iron hydroxides, basic magnesium carbonate, silicon oxide and silicates), g / m 3 Sodium chloride, g / m $ 'Caustic soda, g / m 3 pH Temperature, ° С
    Wastewater at a speed of 1 m 3 is fed into the reaction with thiourea, which is sent to the reactor at a speed of 10 g / m in the form of a 5% solution. The amount of urea added is 2.5 g per 1 g of total mercury. After 8 hours of reaction, water is sent to the mercury separation apparatus by flocculation, where ferric chloride, Depyurol bentonite clay and polyacrylamide PRESTOL 2935/74 are fed.
    The concentration of residual mercury in water is 0.02-0.03 parts per thousand parts of water. The sludge discharged from the apparatus contains 1.5% mercury.
    This invention allows to significantly simplify the method and reduce the number of reagents used. .
    权利要求:
    Claims (3)
    [1]
    Claim
    1. A method of treating wastewater from mercury and its inorganic compounds, including treatment with a chemical reagent and separation of mercury, characterized in that, in order to simplify the process and reduce the consumption of chemical reagents, thiourea is used as a chemical reagent, the processing process is carried out at pH 10- 12 followed by flocculation of mercury.
    -
    [2]
    2. The method of pop. 1, characterized by the fact that thiourea is administered in an amount of 0.38-3 g per 1 g of mercury.
    [3]
    3. The method of pop. 1, characterized in that ferric chloride is used as flocculants in an amount of 10-200 g per 1 m 3 of water and polyacrylamide in an amount of 0.1-10 g per 1 m 3 of water.
    类似技术:
    公开号 | 公开日 | 专利标题
    SU865124A3|1981-09-15|Method of waste water purification from mercury and its inorganic compounds
    US3388060A|1968-06-11|Process and composition for purification of water supplies and aqueous wastes
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    US6627085B2|2003-09-30|Treatment of brine to remove metals and silicon therefrom
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    US3751474A|1973-08-07|Method of preparing nontoxic polyamines
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    SU1490098A1|1989-06-30|Method of purifying waste water from copper and nickel ions
    RU2085509C1|1997-07-27|Method of alkaline sewage treatment, inorganic coagulant for alkaline sewage treatment and method of its preparing
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    SU1640113A1|1991-04-07|Method of cleaning brine from sulfates
    US3890428A|1975-06-17|Decolorization of ammonium thiosulfate
    SU345101A1|METHOD OF CLEANING OF WASTE WATER CONTAINING AMMONIA FROM COPPER
    SU1390193A1|1988-04-23|Method of purifying waste water of mercury
    SU701959A1|1979-12-05|Method of decolorizing biologically purified waste water of cellulose-paper production
    同族专利:
    公开号 | 公开日
    NL178962C|1986-06-16|
    NL178962B|1986-01-16|
    US4087359A|1978-05-02|
    ES429069A1|1977-01-16|
    DE2437779A1|1975-02-20|
    BE818695A|1975-02-10|
    NL7410471A|1975-02-11|
    JPS5044976A|1975-04-22|
    FR2240192B1|1979-02-09|
    FR2240192A1|1975-03-07|
    SE7410019L|1975-02-10|
    SE399869B|1978-03-06|
    JPS5741991B2|1982-09-06|
    CA1031875A|1978-05-23|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US3369886A|1964-09-23|1968-02-20|Exxon Research Engineering Co|Process of producing finely divided metals and alloys|
    US3377274A|1965-01-05|1968-04-09|Nalco Chemical Co|Method of coagulation of low turbidity water|
    US3476552A|1966-09-07|1969-11-04|Mountain Copper Co Of Californ|Mercury process|
    DE1954828B2|1969-10-31|1974-07-18|Chemische Werke Huels Ag, 4370 Marl|Process for reducing mercury losses in chlor-alkali electrolysis using the amalgam process|
    DE2057358C3|1970-11-21|1975-10-02|Friedrich Uhde Gmbh, 4600 Dortmund|Process for the treatment of wastewater with mercury contamination|
    US3674428A|1970-12-22|1972-07-04|Ppg Industries Inc|Mercury removal|
    US3857704A|1971-03-05|1974-12-31|Bp Chem Int Ltd|Mercury recovery process|
    US3847598A|1970-12-31|1974-11-12|Bp Chem Int Ltd|Mercury recovery process|
    US3764495A|1971-04-21|1973-10-09|Allied Chem|Removal of mercury from caustic solutions|
    US3740331A|1971-06-23|1973-06-19|Sybron Corp|Method for precipitation of heavy metal sulfides|
    JPS5112188B2|1972-03-02|1976-04-16|
    SE399869B|1973-08-09|1978-03-06|Montedison Spa|TAKE REMOVAL OF MERCURY OR MERCURY SALTS FROM A LIQUID DRAIN BY TIOKARBAMIDE OR A HYDROXYL AMIN|
    FR2291156A1|1974-11-18|1976-06-11|Potasse & Produits Chimiques|Mercury removal from liqs - by amalgamation with solid reducing agents e.g. iron and copper|SE399869B|1973-08-09|1978-03-06|Montedison Spa|TAKE REMOVAL OF MERCURY OR MERCURY SALTS FROM A LIQUID DRAIN BY TIOKARBAMIDE OR A HYDROXYL AMIN|
    US4549973A|1983-04-25|1985-10-29|Ethyl Corporation|Decolorization of calcium bromide brines|
    DE3839222C2|1988-11-19|1992-10-22|Degussa Ag, 6000 Frankfurt, De|
    DE4013974C1|1990-04-30|1991-09-19|Guenter Dipl.-Ing. 5100 Aachen De Straten|
    US6797178B2|2000-03-24|2004-09-28|Ada Technologies, Inc.|Method for removing mercury and mercuric compounds from dental effluents|
    AU1990702A|2000-11-28|2002-06-11|Ada Technologies Inc|Improved method for fixating sludges and soils contaminated with mercury and other heavy metals|
    US6942840B1|2001-09-24|2005-09-13|Ada Technologies, Inc.|Method for removal and stabilization of mercury in mercury-containing gas streams|
    US7183235B2|2002-06-21|2007-02-27|Ada Technologies, Inc.|High capacity regenerable sorbent for removing arsenic and other toxic ions from drinking water|
    US7048781B1|2002-10-07|2006-05-23|Ada Technologies, Inc.|Chemically-impregnated silicate agents for mercury control|
    DE10336534A1|2003-08-05|2005-02-24|Stockhausen Gmbh|Process to remove heavy metals from industrial liquid effluent arising from one- or two-stage sulfur dioxide gas washers by admixture of flocculent to sludge|
    CA2534082A1|2003-10-01|2005-04-14|Ada Technologies, Inc.|System for removing mercury and mercuric compounds from dental wastes|
    JP5889059B2|2011-04-04|2016-03-22|アークレイ株式会社|Metal recovery method|
    AR089948A1|2012-02-10|2014-10-01|Kemira Oyj|PROCEDURES FOR THE EXTRACTION OF METALS AND OXYIONS FROM WATER CURRENTS|
    EP2746230A1|2012-12-18|2014-06-25|Total SA|Process for removing mercury from production water and condensates.|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    IT2771573A|IT998338B|1973-08-09|1973-08-09|PROCEDURE FOR THE ELIMINATION OF MERCURY FROM LIQUID EFFLUENTS|
    IT2771673A|IT995170B|1973-08-09|1973-08-09|PROCEDURE FOR THE ELIMINATION OF MERCURY FROM LIQUID EFFLUENTS|
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