Study On Carbothermal Reduction Process For Collaborative Disposal Of Alkali Boiled Black-and-white Tungsten Slag And Red Mud

Tungsten is an important strategic metal in China.The main production mode of tungsten is alkali boiling leaching.A large number of tungsten slag will be produced in the leaching process.Tungsten slag contains not only toxic elements such as arsenic,lead and bismuth,but also valuable metals such as iron,manganese,tungsten and tin,which has great recycling value;Aluminum is an important light metal.China is a large country of aluminum production and consumption.A large amount of red mud will be produced in the production process of aluminum.The red mud is rich in iron.Recycling the iron in the red mud can realize resource utilization.According to the characteristics of iron,manganese,tungsten and other valuable metals in alkali boiled black-and-white tungsten slag and red mud and more aluminum calcium oxides in red mud,the idea of collaborative disposal of alkali boiled black-and-white tungsten slag and red mud by high temperature carbothermal reduction to recover valuable metals and separate harmful elements is put forward.The innovative research results of this paper are as follows:Through the thermodynamic calculation of various oxides in alkali boiled blackand-white tungsten slag and red mud with HSC chemistry 6.0,the reduction law of valuable metal elements is mastered,and the temperature conditions and reduction sequence of each element reduction are clarified.A preliminary conclusion is drawn:the low-temperature reaction can effectively separate harmful elements.The higher the temperature,the higher the reduction degree of valuable metals,The reduction sequence of each element in the raw material is: Bi → Pb → As → Sn → W → Fe → Nb → Mn→ Ta → Ti.By investigating the effects of different ratio of alkali boiled black-and-white tungsten slag to red mud,amount of reducing agent,reduction temperature and melting time on metal alloying rate,it is determined that the best co disposal carbothermal reduction process conditions are the ratio of alkali boiled black-and-white tungsten slag to red mud of 50%: 50%,amount of reducing agent of 8%,melting temperature of 1550 ℃and melting time of 120 min.under these conditions,the alloying rates of iron,manganese,tungsten,tin,tantalum and niobium are 99.4%,23.75%,25.08%,89.46%,40.94%,17.53% respectively.The carbon thermal reduction law of oxides in alkali boiled black-and-white tungsten slag and red mud at different temperatures is studied by scanning electron microscope.The results of thermodynamic calculation are verified.Increasing the temperature can promote the reduction reaction and is conducive to the aggregation and growth of metals.Through the study of carbon thermal reduction of alkali boiled black-and-white tungsten slag and red mud,it can not only recover valuable metals,but also reduce the resource consumption of flux and other additional conditions,which provides a good idea for the development of resource utilization.