Experimental Study On Leaching Of Nickel Sulfide Concentrate

With the rapid development of the national economy,the demand for nickel resources is increasing.With the continuous reduction of high-quality nickel ore,it is particularly important to reprocess the refractory nickel ore.In this paper,a low-grade difficult-to-treat nickel sulfide concentrate from a place in Honghe,Yunnan Province was used as the research object,and the hydrometallurgical treatment process was adopted.Via the process mineralogical analysising,the thermodynamic analysis of leaching process,the leaching test and the leaching condition test are carried out,and the leaching kinetics of the related content is also carried out.It provides a certain basis for the leaching of similar low-grade nickel sulfide concentrate.It provides a certain basis for the leaching of similar low-grade nickel sulfide concentrate.Nickel sulfide concentrates mainly include Ni 2.68%,Cu 1.29%,Fe 27.60%,SiO2 20.74%,S 16.70%,MgO 9.27%,etc.The main content of nickel is nickel pyrite and a small amount of violinite.Other major metallic minerals are magnetite,chalcopyrite,pyrite and so on.Nickel pyrite is mainly symbiotic with magnetic pyrite,and it is coated with each other.The reaction types of the leaching process of nickel sulfide concentrate were analyzed.The thermodynamic analysis of the nickel pyrite-water system and the chalcopyrite-water system showed that in the suitable potential and pH range,both the nickel pyrite and chalcopyrite could be dissolved in the leaching system,and the reaction was easy to carry out.The process of leaching of nickel sulfide concentrate,leaching agent,types of leaching agent,oxidant dosage,the liquid-solid ratio,leaching temperature,stirring intensity,ore grain fineness and all affect the leaching time on leaching process.The addition of oxidant RO has a significant effect on the improvement of nickel leaching rate,and it is also leached during leaching.The leaching test results show that the fineness of nickel sulfide concentrate is-0.074mm80%,the ratio of liquid to solid is3:1,the quality of concentrate and oxidizing agent is 1:0.6,the mass of ore acid is 1:1,the leaching temperature is 100,the stirring strength is 300r/min,and the leachingtime is 24 h,the better index of nickel leaching rate is obtained.Nickel sulfide concentrate leaching process dynamics analysis showed that the leaching reaction process,the common effect of dynamics model by data fitting analysis showed that the leaching process of nickel sulfide concentrate and oxidant RO mainly controlled by the nuclear reaction contraction model.