Mechanism of copper smelting process by oxygen bottom blowing and microanalysis of smelting products

The theoretical analysis and verification by water modeling experiment,and the sampling test analysis was carried out to study the behavior of gas injection,the chemical reaction mechanism and the thermal status of matte smelting in the oxygen bottom blowing smelting process.The results show that the melt can be stirred to form a homogeneous diffusion region by the flow in oxygen bottom blowing.In the region of continuous gas or liquid phase,the intense interactions between gas and liquid or pure liquid provide a good kinetic condition for the chemical reaction and heat and mass transfer in the furnace.Without coal blending,the autogenous smelting process can be achieved in oxygen-enriched bottom blowing process which has a great advantage in the energy saving and emission reduction.The morphology of each component in the copper slag,copper matte and mushroom was identified,and the phase composition was determined.The slag samples are mainly composed of matte phase,magnetite phase,fayalite phase and vitreous phase,the distribution of oxygen potential and sulfur potential has a favorable effect on the reaction in the furnace and can effectively restrain the formation of Fe3O4 and reduce copper in the slag.