Experimental Study On The Mechanism Of Copper Slag Release And The Transformation Of Fe Compounds During Cooling

Copper slag is a byproduct of copper smelting production process of the formation of these high-temperature copper slag contains large amounts of waste heat and energy, its recycling will bring enormous economic and environmental benefits to society. The remainder of the copper slag can be divided into latent and sensible heat. There are two main whereabouts of the sensible heat, mostly absorbed by the cooling water waste, partially recovered for power equipment and heating equipment. The latent heat is due to the structure is too complex slag cause relatively less research. In addition copper slag also contains a lot of valuable metals, copper slag content of iron in general can reach 40wt%, while smelting iron ore with an average grade of only about 29%. Effective separation and utilization of copper slag in the presence of divalent metal A greater difficulty.In this paper, copper slag waste heat recovery and utilization of research objectives, the use of copper slag thermodynamic model and thermal content of the different components of the formula for copper slag thermal characteristics analysis. While using the experimental study of changes in the laws of different cooling processes copper slag Fe compounds do some basic analysis. Details are as follows:Firstly, according to the slag analysis and calculation of the thermodynamic model latent heat of copper slag, Obtained slag FeO, MgO, CaO activity, respectively 1.35,0.06,1.09. Then draw its system mixing Gibbs free energy,321.507KJ thermodynamic analysis and calculation of copper slag.Secondly, according to the specific heat of the material derived slag the sensible heat is calculated on the temperature, And calculated according to the equation of silica and alumina content of different copper slag sensible heat, Copper slag Obtained when the mass fraction of SiO2 17.86%, Al2O3 mass fraction of 3.9%, Copper slag release energy for 1484.32 KJ/Kg when cooled to room temperature from 1673K; When copper slag SiO2 mass fraction of 30%, copper slag release energy for 1534KJ/Kg; When the mass fraction of copper in the slag of Al2O3 is 8%, copper slag total sensible heat of 1508KJ/Kg. When the copper slag cooling energy release, its temperature is higher than the low energy release segment segment. Also analyzed by DSC heat was found in the temperature of copper slag cooling section 1400℃～25℃ phase transition mostly glass transition.Finally, by the different copper slag cooling experiments, Obtained in air, Magnetite content in the slag cooling can reach more than 35%; When the cooling rate is not the same, the resulting slag high magnetite content of around 44%,22.79% higher than the original Slag magnetite content. The resulting copper slag FeO due to easy oxidation under high temperature molten slag in the SiO2 and combined under nitrogen atmosphere, the formation of iron olivine.