Unlike the reported leaching technologies of waste superalloys, the process of the “atomized spray-sulfuric acid leaching nickel and cobalt” technology was put forward in the present work according to the compositio...Unlike the reported leaching technologies of waste superalloys, the process of the “atomized spray-sulfuric acid leaching nickel and cobalt” technology was put forward in the present work according to the compositions of waste superalloys. The effects of sulfuric acid temperature, concentration, leaching time, stirring speed and size of superalloys on leaching of Ni and Co from waste superalloys have been mainly investigated, and the optimum leaching conditions were determined and reported. The leaching rates for nickel and cobalt were 96.68% and 96.63%, respectively, and the contents of nickel and cobalt in leaching slag were 6.77% and 0.96%, respectively. The obtained leaching solution containing Ni and Co could be used for production of Ni and Co products after removal.展开更多
以含铬电镀污泥为研究对象,探究酸浸条件对重金属浸出的影响。考察了浸取剂种类、用量、浸取温度、浸取时间和振荡频率等因素对Cr、Ni、Zn浸出率的影响,选取4个因素进行正交实验。实验结果表明:硫酸与柠檬酸作为浸取剂的浸取效果比盐酸...以含铬电镀污泥为研究对象,探究酸浸条件对重金属浸出的影响。考察了浸取剂种类、用量、浸取温度、浸取时间和振荡频率等因素对Cr、Ni、Zn浸出率的影响,选取4个因素进行正交实验。实验结果表明:硫酸与柠檬酸作为浸取剂的浸取效果比盐酸、硝酸和硼酸要好;选用硫酸作为浸取剂时,浸取剂用量为16 m L,浸取温度为35℃,浸取时间为2 h,振荡频率为50 r/m时,Cr、Ni、Zn的浸出率分别为76.37%、94.28%、91.23%;正交实验结果表明:浸取剂种类对重金属浸出影响最大,浸取剂用量次之;Cr、Ni、Zn三者的优化条件有所不同,优化后Cr、Ni、Zn的浸出率分别为96.89%、98.37%、97.52%。展开更多
为了更高效地从粗制氢氧化镍钴中浸出镍、钴,采用两段浸出工艺,以瑞木粗制氢氧化镍钴为原料浸出镍、钴,考察一段浸出pH、温度、浸出时间,以及二段浸出硫酸加入量和时间对镍、钴、锰浸出效果的影响。研究得出:在一段浸出温度70℃、pH=2.0...为了更高效地从粗制氢氧化镍钴中浸出镍、钴,采用两段浸出工艺,以瑞木粗制氢氧化镍钴为原料浸出镍、钴,考察一段浸出pH、温度、浸出时间,以及二段浸出硫酸加入量和时间对镍、钴、锰浸出效果的影响。研究得出:在一段浸出温度70℃、pH=2.0~2.5、浸出时间1.5 h,二段浸出硫酸加入量为一段硫酸加入量的50%~70%的条件下,镍、钴浸出效果最好,分别可以达到100%和98.99%,锰的浸出率可以抑制在36.82%,此时渣率为5.32%,渣中钴和锰元素含量分别为0.71%和55.55%,两段总的酸耗在760 kg t左右。根据小试条件进行300 kg d连续扩大试验,结果可以达到小试的浸出效果。展开更多
文摘Unlike the reported leaching technologies of waste superalloys, the process of the “atomized spray-sulfuric acid leaching nickel and cobalt” technology was put forward in the present work according to the compositions of waste superalloys. The effects of sulfuric acid temperature, concentration, leaching time, stirring speed and size of superalloys on leaching of Ni and Co from waste superalloys have been mainly investigated, and the optimum leaching conditions were determined and reported. The leaching rates for nickel and cobalt were 96.68% and 96.63%, respectively, and the contents of nickel and cobalt in leaching slag were 6.77% and 0.96%, respectively. The obtained leaching solution containing Ni and Co could be used for production of Ni and Co products after removal.
文摘以含铬电镀污泥为研究对象,探究酸浸条件对重金属浸出的影响。考察了浸取剂种类、用量、浸取温度、浸取时间和振荡频率等因素对Cr、Ni、Zn浸出率的影响,选取4个因素进行正交实验。实验结果表明:硫酸与柠檬酸作为浸取剂的浸取效果比盐酸、硝酸和硼酸要好;选用硫酸作为浸取剂时,浸取剂用量为16 m L,浸取温度为35℃,浸取时间为2 h,振荡频率为50 r/m时,Cr、Ni、Zn的浸出率分别为76.37%、94.28%、91.23%;正交实验结果表明:浸取剂种类对重金属浸出影响最大,浸取剂用量次之;Cr、Ni、Zn三者的优化条件有所不同,优化后Cr、Ni、Zn的浸出率分别为96.89%、98.37%、97.52%。
文摘为了更高效地从粗制氢氧化镍钴中浸出镍、钴,采用两段浸出工艺,以瑞木粗制氢氧化镍钴为原料浸出镍、钴,考察一段浸出pH、温度、浸出时间,以及二段浸出硫酸加入量和时间对镍、钴、锰浸出效果的影响。研究得出:在一段浸出温度70℃、pH=2.0~2.5、浸出时间1.5 h,二段浸出硫酸加入量为一段硫酸加入量的50%~70%的条件下,镍、钴浸出效果最好,分别可以达到100%和98.99%,锰的浸出率可以抑制在36.82%,此时渣率为5.32%,渣中钴和锰元素含量分别为0.71%和55.55%,两段总的酸耗在760 kg t左右。根据小试条件进行300 kg d连续扩大试验,结果可以达到小试的浸出效果。
