氯化铵溶液中还原浸出海洋锰结核

REDUCTION LEACHING OF MANGANESE NODULE IN AMMONIUM CHLORIDE SOLUTION

采用亚硫酸钠作还原剂对氯化铵溶液中海洋锰结核的浸出行为进行研究，探讨Ｎａ２ＳＯ３加入量、ＮＨ４Ｃｌ浓度及初始ｐＨ值、浸出温度和时间等对锰结核中铜、镍、钴、锰、铁浸出率的影响。结果表明５．０ｍｏｌ／ＬＮＨ４Ｃｌ溶液中，初始ｐＨ值约５．０及８０℃、１８０ｍｉｎ，锰结核与Ｎａ２ＳＯ３等量加入时，铜、镍、钴、锰的浸出率分别为８８．５６％、９６．１４％、７８．５７％、３５．２％，铁几乎未被浸出。而在同样的条件下，控制浸出过程的ｐＨ值４．０左右，１２０ｍｉｎ后铜、镍、钴、锰、铁的浸出率分别为９０．２１％、９８．８０％、９１．４３％、９８．１１％、２０．１３％。

The leaching of manganese nodules was conducted in ammonium chloride solution with sodium sulfite as reductant.Several factors affecting the extraction of the metal values such as Cu,Ni, Co,Mn,Fe contained in the nodules were investigated.The results show that when the reductant was charged enough,the leaching rates of Cu,Ni,Co and Mn were 88.56%, 96.14%,78.57%a and 35.27% respectively,and almost no iron was leached in 5.0 mol/L NH4Cl solution which initial pH was about 5.0 at 80℃ and 180 min.When the pH of the leaching process was kept around 4.0,the leaching percentages of the metals were 90.21% Cu,98.80% Ni,91.43% Co,98.11%Mn and 20.10% Fe respectively.