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    • 5. 发明申请
    • GASIFICATION METHOD
    • 气化方法
    • WO99055804A1
    • 1999-11-04
    • PCT/JP1999/002099
    • 1999-04-20
    • C02F1/20C02F1/58C10K1/10C10K1/26C10K1/32C10K3/00B01D19/00C02F1/62C10K1/02
    • C02F1/58C02F1/20C10K1/105C10K1/26C10K1/32
    • A method for removing a cyanide component by or in application of steam stripping while suppressing the formation of a nickel-cyanide complex. A mixture of a raw material and sulfur is fed to a gasification step (101) in a way such that the mixture has a sulfur content of 0.5 to 2.0 wt. % and is gasificated. The resultant crude gas is washed in a cooling/carbon washing step (102), wherein nickel sulfide or the like is preferentially formed in a drain water and the formation of a nickel-cyanide complex is suppressed. A cyanide component is emitted as HCN. Alternatively, to stripper (201), drain water is introduced from line (210), a strong acid from line (211) and steam from line (212). A nickel-cyanide complex contained in a drain water having a controlled pH of 2.0 to 6.0 is decomposed to a cyanide ion and a nickel ion. The cyanide ion is finally emitted as HCN from line (216), and a nickel ion is discharged from line (217) and treated as nickel hydroxide.
    • 一种在抑制氰化镍络合物的形成的同时通过蒸汽汽提除去氰化物成分或者应用蒸汽汽提的方法。 将原料和硫的混合物以使得混合物的硫含量为0.5〜2.0重量%的方式进料至气化工序(101)。 %并被气化。 所得粗气体在冷却/碳清洗步骤(102)中洗涤,其中优选在排水中形成硫化镍等,并且抑制形成氰化镍络合物。 氰化物成分以HCN的形式排放。 或者,对于汽提器(201),从管线(210)引入排水,来自管线(211)的强酸和来自管线(212)的蒸汽。 受控pH为2.0〜6.0的排水中含有的氰化镍络合物分解为氰离子和镍离子。 氰化物离子最终作为HCN从管线(216)中排出,镍离子从管线(217)排出并作为氢氧化镍处理。