Researcher On The Experimental Study On Comprehensive Utilization Of Extracting Iron From Copper Slag

Currently more than 90 per cent of our copper productions are pyrometallurgical production, the pyrometallurgical production of 1t of refined copper output to about 2.2t slag. By the end of 2015 refined copper production capacity of 10.56 million tons,according to the productivity calculation, China’s output of 23 million tons in 2015 to smelting copper slag, copper slag which not only occupy a lot of land, a variety of basic slag containing heavy metals copper also contaminated land and the local environment.Gansu factory provided by copper slag chemical analysis found that copper slag contains a variety of valuable metals, especially iron content of up to 40% higher than that of a lot of ore grade. If you can effectively recycled copper slag iron, copper slag produced only year of 2015 can be recovered nearly 10 million tons of iron. Thus, copper slag recycling of iron not only can reduce the area of the local copper slag dumps and environmental pollution,as well as considerable economic value.This project as copper slag as raw material, copper slag chemical analysis and mineralogical analysis to explore factors related to copper slag direct reduction and smelting reduction of iron lifting effects for optimal laboratory conditions under the influence of copper slag mention iron parameters, provide theoretical guidance and basic experimental data for subsequent semi-industrial and industrial production.Existing copper slag Occurrence form of iron is mainly fayalite(Fe2Si O4), high stability and restore fayalite poor performance, if the experiment directly mention iron,copper slag basicity only 0.4, copper slag FeO low activity, impede the reduction reaction,the reduction starting temperature at this alkalinity conditions up 1042.2K, increase the cost reduction, and therefore need to raise iron copper slag before the sample is a modified process as the copper alkalinity slag. It was found that, in addition to a certain amount of copper slag CaO, can make the copper slag fayalite in stable SiO2 is replaced,reducing the temperature of the reduction reaction started, and with the addition of CaO,bath increased alkalinity, FeO activity increases. But an excess of CaO slag viscosity will increase and hinder the reaction; in addition, knowledge of the factors influencing the use of dynamics smelting reduction reactions were analyzed and found that as the temperature increases, the viscosity of slag to diminish, from the molecular theory slag viscosity decreases, the kinetic conditions improved, reducing the rate of rise in iron, but not unlimited elevated temperature and increase the rate of reaction, when the temperature exceeds a certain range, the reduction reaction equilibrium is reached, then the reaction temperature continues to rise Has little effect. Thus, the experiments on the effects of temperature and alkalinity mention the reaction of iron were studied experimentally optimized. In addition, due to copper slag modifier to adjust alkalinity add CaO and reductant coal, so the need for research to determine the modified copper slag after the performance into a ball and green ball properties pelletizing process.Though the improvement of copper slag pelletizing process includes a control method adding water feeding method and pelletizer, and on the use of copper slag production of green pellets were tested and found by the addition of 2% bentonite to copper slag can increase pellet strength, and the alkalinity of 1.0, 1.2, the green ball landed properties include strength, compressive strength and burst temperature, dried epigenetic ball compressive strength to meet production requirements. Continued use of pellet smelting test using the method of controlling variable test results were analyzed and found that every 100 g of copper slag with 28.08 g CaO namely copper slag basicity of 1.2, the addition of 13.3g coal reduction, reduction temperature of 1450℃ and incubated 50 min under the conditions, the highest reduction rate of iron, iron slag separation best.Semi-industrial experiments in this condition, obtained 80.9% of the iron reduction rate effects, to achieve the purpose of the experiment.