摘要
Abstract
To address low metal recovery and high energy consumption in copper slag utilization,the relationship between slow cooling optimization and valuable mineral liberation was studied.Using a bottom-blown furnace slag,programmable cooling with multi-gradient rates and isothermal holds was applied.Modified products were analyzed by XRD,SEM-EDS,and automated mineralogy for 3D phase reconstruction,micro-morphology,and liberation quantification.Results:Reducing the cooling rate from quenching to a slow crystallization regime exponentially increases fayalite crystallinity,coarsening encapsulated copper sulfides and associated metals from micrometers to>58 μm.A 120 min isothermal hold in the critical viscosity-transition zone promotes Brownian motion and gravity settling of fine matte droplets,leading to coalescence.Under optimal slow cooling,copper liberation reaches 87.6%(34.2 percentage points higher than water-quenched slag),with concentrate copper grade and recovery stabilized at 24.5%and 89.3%,respectively.Precisely controlling the cooling kinetics of the silicate melt from liquidus to solidus reshapes the multiphase structure,eliminates physical encapsulation by the fayalite matrix,and optimizes liberation of copper and precious metals,effectively supporting industrial solid waste recycling.关键词
铜冶炼/冶炼渣/缓冷工艺/工艺优化/金属解离度Key words
copper smelting/Smelting slag/Slow cooling process/Process optimization/Metal dissociation degree分类
社会科学
