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    • 3. 发明授权
    • Two-stage leaching process for steel plant dusts
    • 钢厂粉尘二期浸出工艺
    • US4610721A
    • 1986-09-09
    • US696980
    • 1985-01-31
    • Willem P. C. DuyvesteynMahesh C. Jha
    • Willem P. C. DuyvesteynMahesh C. Jha
    • C22B7/02C22B3/00
    • C22B7/02C22B19/22C22B19/26Y02P10/234Y10S75/961
    • A process is provided for selectively recovering zinc from steel plant dust containing substantial amounts of iron. The process comprises atmospherically leaching the steel plant dust in a first stage wherein an amount of steel plant dust is mixed with an amount of acidic zinc sulfate solution to leach zinc therefrom, the leaching of the dust being such that the solution is controlled to a terminal pH ranging from about 2 to 3.5 and preferably from about 2.5 to 3.5, thereby limiting iron dissolution. The mixture is then subjected to a crude liquid/solid separation step whereby a thickened pulp is produced containing zinc and iron values and a separated liquid containing low iron and substantial amounts of zinc, the solution being sent to zinc recovery. Following separation, the thickened pulp, together with additional sulfuric acid or spent electrolyte, is subjected to high pressure leaching at a temperature at least sufficient to leach the remaining zinc values and provide an acid zinc sulfate solution thereof, while converting hydrated iron oxides into free settling hematite residue, the amount of additional sulfuric acid added to said thickened pulp being sufficient to obtain near quantitative dissolution of zinc without excessive iron dissolution.
    • 提供了一种从含有大量铁的钢厂粉尘中选择性回收锌的方法。 该方法包括在第一阶段大气浸出钢厂粉尘,其中将一定量的钢厂粉尘与一定量的酸性硫酸锌溶液混合以从其中浸出锌,将粉尘的浸出使得溶液被控制到终端 pH范围为约2至3.5,优选约2.5至3.5,从而限制铁的溶解。 然后将混合物进行粗液/固分离步骤,由此产生含有锌和铁值的增稠纸浆和含有低铁和大量锌的分离液体,将溶液送至锌回收。 分离后,将增稠的纸浆与另外的硫酸或废电解液一起在至少足以浸出剩余锌值的温度下进行高压浸出,并提供其酸性硫酸锌溶液,同时将水合氧化铁转化为游离的 沉淀赤铁矿残渣,添加到所述增稠纸浆中的额外硫酸的量足以获得锌的近似定量溶解而不过量铁溶解。