Research On Copper Converter Slag Depletion And Viscosity Control Under The Reduction Of Rubber Seed Oil

Due to the exhaustion of high-grade copper ore resources and the high production cost of low-grade copper ores,the comprehensive recovery and utilization of valuable metals in smelting residues become a pressing problem at present.The technology of oxygen enriched intensified smelting has been widely applied in the copper smelting process.However,the enrichment problem of magnetic iron oxide in copper slag has not been solved practically,making the viscosity of slag increase.It is difficult to separate the slag and copper,which leads to the increase of copper content in the slag.Therefore,the copper slag after enriched oxygen enriched smelting must be reduced to reduce the copper content in the slag to improve the recovery of copper.Coke and pulverized coal are often used as reducing agents in the electric furnace dilution process of copper slag,but these traditional reducing agents not only pollute severely,but also face exhaustion pressure.Therefore,a new way of reducing copper conversion slag with rubber seed oil is proposed from the perspective of environmental protection and sustainable development in this paper.The main contents of this paper are as follows:Firstly,the process of reducing magnetic iron in copper slag by rubber seed oil is thermodynamically analyzed.The results show that the pyrolysis products H2,CO and elemental carbon which are encapsulated by air bubbles react with the magnetic iron in the slag surface,and produce the H₂?CO₂ and CO.The generated H₂O and CO₂ will continue to react with the cracking products?H₂,CO and single carbon?to produce H₂and CO.The generated H₂ and CO will continue to be reduced to the magnetic iron in the slag as the reducing agent.Secondly,magnetic iron content and phase in converter slag were analyzed by magnetic analyzer,XRD and SEM.Viscosity of converter slag with different magnetic iron content after reduction was determined by high temperature viscometer.The results show that the magnetic iron content of converter slag gradually decreases with the increase of reduction time and reduction temperature,and the viscosity of converter slag gradually decreases.The accumulation of copper particles at the bottom of the crucible increases gradually and the mass is increasing.Finally,the effects of additives CaO,Al₂O₃ and Cu₂O content on the viscosity of converter slag were studied based on the results of reduction experiments of copper slag.The viscosity of converter slag with different content of additives was measur ed by a high temperature viscometer.The results show that the additive content unchanged,slag viscosity decreased gradually with the increase of temperature,when the temperature is higher than 1250°C,the viscosity change tends to be stable,no longer with the increase of temperature obviously decreased;at the same temperature,the viscosity of the slag showed a trend of decreased first and then increased with the increase of Ca O content,when the Ca O content increased to 2%,the viscosity of slag is minimized,slag viscometer gradually increased with the increase of Al₂O₃ and Cu₂O content,and the lower the temperature,the dosage is higher,the viscosity increased more obviously.