Process of Chloridizing Roasting-Weak Acid Leaching for Electroplating Sludge
Process of Chloridizing Roasting-Weak Acid Leaching for Electroplating Sludge
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发表时间：
2014
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通讯作者：
Zheng Shu
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作者：
Zheng Shu
根据电镀污泥氯化焙烧热力学分析，以氯化铵为氯化剂在673 K焙烧时，镍、铜等主要金属离子可被氯化，而以针铁矿和赤铁矿为主相的铁理论上难以氯化。对焙烧后的物料进行弱酸浸出,优化参数为:盐酸酸度为1 mol/L,浸出时间为45 min,浸出温度为318 K,液固比为4∶1。结果与热力学分析相符,镍和铜的浸出率分别为97. 48%和87. 65%,而铁的浸出率仅为26. 83%。
According to the thermodynamic analysis for chloridizing roasting of electroplating sludge,main metal ions including nickel and copper can be chloridized when roasted at 673 K with ammonium chloride as the chloridizing agent,while iron,with goethite and hematite being the dominant phase,is theoretically difficult to be chloridized. Materials from roasting were leached by weak acid,and parameters were optimized as follows: the acidity of hydrochloric acid was1 mol / L,leaching time was 45 min,leaching temperature was 318 K,and liquid to solid ratio was 4∶ 1. The results are consistent with the thermodynamic analysis,as leaching rates of nickel and copper are 97. 48% and 87. 65%,respectively,while leaching rate of iron is only 26. 83%.