The High Nickel And Copper Anode Slime, Oxygen Pressure Leaching Pretreatment De-nickel Process Experimental Study

Because of good mechanical strength, scalability and high chemical stability, nickel was widely used in various fields, and became the indispensable metal for development of modern aviation industry, defense industry, and a modern system that establish the high level of human material and cultural life.Date from the oxidizing pressure leaching was proposed, an industrial applications has complete in extraction of Zinc, uranium, molybdenum, copper, cobalt, manganese, aluminum, vanadium. The reaction rate can be increased under the condition of high temperature and pressure, so many processes that could not be achieved under normal temperature and pressure can succeed. For the character of clean production, simple process, low investment, high rate of comprehensive utilization about the resources, the higher pressure leaching is expected to replace the traditional pretreatment.This paper gives a review of the nickel smelting and refining process contains dry metallurgy and hydrometallurgy, new metallurgical analysis of nickel and the development status and trends. According the chemical composition analysis and phase analysis of copper anode mud know that: nickel content is high. In response to this situation, a small pilot study that gives the treatment of oxygen pressure and acid leaching to the copper anode mud was proposed.Use the method of oxygen pressure and acid leaching, we give a pretreatment of denickelefication, before the laboratory testing, exploratory test was given to find out an better test extent. on this basis, a single factor conditions test contains leaching temperature, partial oxygen pressure, stirring speed, acidity, and leaching time has been given to proof the influence of leaching rate of nickel, then determine the optimum conditions of oxygen pressure acid leaching.The optimum test conditions been: leaching temperature 165℃, partial oxygen pressure 0.9MPa, stirring speed 750rpm, acidity 250g/L, and leaching time 150min, liquidtosolid ratio 6: 1. Under these conditions, the test results been: leaching rate of nickel is above 90% . Denickelefication process provide a basis of extraction of nickel, it shorten the process and enhance the recovery rate of nickel.