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292 条记录 (耗时 0.013 秒)

    Treatment of acid waste waters to produce ferromagnetic sludges
    11.
    发明授权
    Treatment of acid waste waters to produce ferromagnetic sludges 失效
    处理酸性废水产生铁磁污泥

    公开(公告)号：US3927173A

    公开(公告)日：1975-12-16

    申请号：US44531574

    申请日：1974-02-22

    申请人： ARMCO STEEL CORP

    发明人： MELZER STEPHEN F

    IPC分类号： C22B1/00 ,  C02F1/48 ,  C02F1/64 ,  C02F1/72 ,  C02F9/00 ,  C01G1/00

    CPC分类号： C02F9/00 ,  C02F1/488 ,  C02F1/72 ,  C02F2101/20 ,  Y10S423/01 ,  Y10S423/02

    摘要： Ferrous iron bearing acid waste waters such as hydrochloric acid waste waters or sulfuric acid waste waters or a combination of the two with or without a small amount of hydrofluoric acid, are treated with lime or sodium hydroxide and partially oxidized to produce hydrated ferroso-ferric oxide or hydrated magnetite. The process is conducted at ambient temperatures in a batch-type or a continuous operation.

    摘要翻译： 含有酸性废水，如盐酸废水或硫酸废水或二者混合使用或不含少量氢氟酸，用石灰或氢氧化钠处理，并部分氧化生成水合铁 - 铁 - 氧化物 或水合磁铁矿。 该方法在环境温度下以间歇式或连续操作进行。

    Recovery of sulfur dioxide from sulfuric acid containing ferrous sulfate
    12.
    发明授权
    Recovery of sulfur dioxide from sulfuric acid containing ferrous sulfate 失效
    从含硫酸亚铁的硫酸中回收二氧化硫

    公开(公告)号：US3906039A

    公开(公告)日：1975-09-16

    申请号：US33841673

    申请日：1973-03-06

    申请人： ZIEREN CHEMIEBAU GMBH DR A

    发明人： FURKERT HERBERT

    IPC分类号： C01B17/50 ,  C01B17/58

    CPC分类号： C01B17/58 ,  Y10S423/02

    摘要： In a process for the production of a gas containing sulfur dioxide from a dilute aqueous sulfuric acid stream containing iron (II) sulfate and approximately 10-40% by weight H2SO4, e.g. pickle liquor or waste H2SO4 from TiO2 production, comprising concentrating the acid in an evaporation stage, and reductively cracking the concentrating acid in a cracking stage at temperatures of between 850* and 1,100* C. to a hot cracked gas containing SO2 and metallic oxides, THE IMPROVEMENT COMPRISING EVAPORATING THE 10-40% STRENGTH SULFURIC ACID TO 55-70% STRENGTH SULFURIC ACID BY DIRECT HEAT EXCHANGE WITH THE HOT CRACKED GAS; SIMULTANEOUSLY FORMING PRECIPITATE CONTAINING IRON (II) sulfate; and passing resultant evaporated sulfuric acid to the cracking stage. The resultant cracked gas containing metallic oxides, aluminum and magnesium oxides in particular, is purified by the direct heat exchange treatment insofar as the metallic oxides are scrubbed out and become enmeshed in the sulfate precipitate.

    摘要翻译： 在从含硫酸铁（II）和约10-40重量％H 2 SO 4的稀硫酸水流中生产含二氧化硫的气体的方法中， 酸洗液或废H2SO4，包括在蒸发阶段浓缩酸，并将浓缩酸在850-1100℃的温度下，在含有SO 2和金属氧化物的热裂解气中进行还原性裂化， 包括将10-40％强酸性硫酸蒸发至具有热裂解气体的直接热交换的55-70％强酸性硫酸的改进; 同时形成含硫酸铁（II）的预硫化物; 并将所得蒸发的硫酸通入裂化阶段。 所形成的含金属氧化物，特别是铝和镁的氧化物的裂化气体，通过直接热交换处理进行纯化，只要金属氧化物被洗去并变成含硫酸盐沉淀物。

    Method for selectively leaching metal values from ocean floor nodules
    14.
    发明授权
    Method for selectively leaching metal values from ocean floor nodules 失效
    从海洋地层中选择性地浸出金属值的方法

    公开(公告)号：US3795596A

    公开(公告)日：1974-03-05

    申请号：US3795596D

    申请日：1972-07-17

    申请人： DEEPSEA VENTURES INC

    发明人： KANE W ,  CARDWELL P

    IPC分类号： C22B47/00 ,  C22D1/14 ,  C22D1/24

    CPC分类号： C22B47/00 ,  C22B47/0063 ,  Y10S423/01 ,  Y10S423/02 ,  Y10S423/04

    摘要： METHOD FOR RECOVERING METAL VALUES FROM OCEAN FLOOR MODULES OF THE TYPE CONTAINING IRON, MAGANESE, COPPER COBALT AND NICKEL COMPRISING GRINDING THE NODULES INTO PARTICLES, SUBJECTING THE GROUND NODULES TO A FIRST LEACHING STEP WHICH DISSOLVES COPPER AND NICKEL, AFTER WHICH THE SOLIDS ARE SEPARATED, THEN SUBJECTING THE LEACH LIQUOR TO LIQUID ION EXCHANFGE AND ELECTROLYZING SO AS TO OBTAIN COPPER AND NICKEL VALUES. SUBJECTING THE SOLIDS TO A SECOND LEACH, USING FERROUS SULFATE OR FERROUS CHLORIDE, REMOVING THE IRON OXIDE AND SUBJECTING THE SOLIDS TO A LIQUID IION EXCHANGE FOR SEPARATING COBALT AND MANGANESE AND THEN ELECTROLYZING TO RECOVER INDEPENDENTLY THE COBALT AND MANGANESE VALUES.