钼精矿精准脱铜工艺研究OA

To reduce the copper content and improve the quality of copper-bearing molybdenum concentrate,this study employed pres-sure leaching and M5640 solvent extraction processes.The key parameters for optimizing copper pressure leaching were investigated,a-long with the feasibility of short-process extraction separation of copper and molybdenum from the leach solution.The main conclusions are as follows:under optimal conditions(liquid-to-solid ratio L/S=5,temperature 155℃,oxygen pressure 0.6 MPa,5%sodium lig-nosulfonate,time 1.5 h),the leaching rates of Cu and Mo reached 96.88%and 0.3%,respectively.The leachate was subsequently treated with 10%M5640 for co-extraction of Cu and Mo,followed by 20 g/L sulfuric acid for Fe scrubbing,200 g/L sulfuric acid for Cu stripping,and 0.15 mol/L ammonia solution for Mo stripping.The extraction rates for Cu and Mo were 97.62%and 94.24%,re-spectively,with a Fe scrubbing efficiency of 98.27%,Cu stripping rate of 98.30%,and Mo stripping rate of 99.56%.The mechanism behind the differential oxygen pressure water leaching of copper and molybdenum was analyzed,and for the first time,the mechanism of molybdenum extraction using M5640 was proposed.A short-process pretreatment method for copper-bearing molybdenum concentrates was developed,enabling selective copper leaching and achieving the separation and recovery of Cu,Mo,and Fe from the leach solu-tion.This approach may provide a reference for the treatment of similar molybdenum concentrate resources.