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    Process for the combined elimination and/or reconditioning of carburizing salt wastes
    1.
    发明授权
    Process for the combined elimination and/or reconditioning of carburizing salt wastes 失效
    组合消毒和/或重新加工硫酸盐废水的方法

    公开(公告)号：US3847597A

    公开(公告)日：1974-11-12

    申请号：US34804573

    申请日：1973-04-05

    申请人： GOLDSCHMIDT AG TH

    发明人： WITZKE L ,  MUELLER W ,  RODEWALD B

    IPC分类号： C01F11/18 ,  C01F11/46 ,  C21D1/46 ,  C21D1/607 ,  C23C8/40 ,  C22B7/00

    CPC分类号： C21D1/607 ,  C01F11/188 ,  C01F11/462 ,  C21D1/46 ,  C23C8/40 ,  Y02P10/212

    摘要： A process for the elimination and/or reconditioning of carburizing salt wastes resulting from the hardening of various steel products, including, nitrite- and nitrate-containing wastes, sometimes containing barium, and cyanide- and cyanatecontaining wastes in which the nitrite- and nitrate-containing wastes are melted at a temperature between about 120* and 400*C, the resultant melt is filtered to obtain a reusable liquid nitrite/nitrate mixture and a solid residue, an excess of the residue is mixed with a solid cyanide- and cyanate-containing waste, if the barium-containing waste is to be eliminated rather than reconditioned, a sulfate of calcium, sodium, iron or mixtures thereof is added to the mixture in an amount equivalent to the barium content, and if it is desired to prevent the formation of nitric oxides, a reducing agent, such as, fine coal, charcoal, etc., is added to the mixture, the mixture is heated to a temperature of at least 150*C for a time sufficient to cause ignition of the mixture, preferably in a thin layer on a moving belt, the ignited product is washed with water and filtered to obtain a reusable barium carbonate residue and a strongly alkaline solution containing alkali carbonate suitable for use in the preliminary clean-up of heavy metal salt-containing industrial waste waters or the neutralization of waste acids, and, if a sulfate has been added, directly discarding the ignited product as a storable refuse.

    摘要翻译： 一种用于消除和/或修复由各种钢产品硬化所导致的渗碳盐废物的方法，包括含有亚硝酸盐和硝酸盐的废物，有时含有钡，以及含氰化物和氰酸盐的废物，其中亚硝酸盐和 含硝酸盐的废物在约120℃和400℃之间的温度下熔化，将所得的熔体过滤，得到可重复使用的亚硝酸盐/硝酸盐混合物和固体残渣，将过剩的残余物与固体氰化物和 含氰酸盐的废物，如果要将含钡废物排除而不是经过修复，则将钙，钠，铁或其混合物的硫酸盐以与钡含量相当的量加入到混合物中，如果需要 防止形成一氧化氮，向混合物中加入还原剂，如细煤，木炭等，将混合物加热到至少150℃的温度足以达到 使用混合物的点燃，优选在移动带上的薄层中，点燃的产物用水洗涤并过滤以获得可重复使用的碳酸钡残余物和含碱性碳酸盐的强碱性溶液，适用于初步清洁 含重金属盐的工业废水或废酸中和，如果加入硫酸盐，直接将点燃的产品弃置为可储存的垃圾。