Numerical simulation of nickel flash melting process

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Numerical simulation software was used to study the velocity, temperature and concentration of the gas phase in the flash furnace of a large nickel plant in China, as well as the velocity and temperature distribution characteristics of particles of different particle sizes. The results show that after simulation by COMSOL software, the mixed gas stream injected by the nozzle expands after entering the furnace, it forms a vortex in the flash furnace, and moves towards the upper part of the reactor tower and causes backflow. The oxidation reaction mainly occurs in the area of 1.2 m radius from the center of the tower, and the oxidation reaction is basically completed at 5.59 m from the top of the tower. The oxygen is not completely consumed and the oxygen volume fraction at the outlet of the precipitation tank is 7.70%.There is a local high temperature region below the nozzle and in the middle and lower part of the reaction tower, and a low temperature region in the middle and upper part of the reaction tower. The small particle size mixture particles are affected by the gas to a greater extent than the large particle size mixture particles and reach a greater maximum velocity. And due to the low ignition point, the temperature increases faster. The melting reaction is more effective when the mixture particle size is controlled between 60−80 μm.

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Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology)