The rotary kiln and electric furnace melting process is the primary pyrometallurgical method for producing Fe-Ni alloy from nickel laterite.During the drying and preheating stages in the rotary kilns,nickel laterite b...The rotary kiln and electric furnace melting process is the primary pyrometallurgical method for producing Fe-Ni alloy from nickel laterite.During the drying and preheating stages in the rotary kilns,nickel laterite briquettes tend to generate significant amounts of powder because of insufficient heating.These fine powders not only contribute to ring formation within the kiln but also impair the gas permeability of electric furnaces,thereby increasing their power consumption.Replacing the rotary kiln with a traveling grate can significantly improve the strength of reduced briquettes and enhance the discharge temperature.Under a reduction temperature of 1000℃ for 10 min,using green briquettes containing 8 wt.% coal processed through a traveling grate,the reduced briquettes achieved cold compressive strength of 449.7 N/briquette,dropping strength of 88.00%,tumbler strength of 83.49%,Ni metallization degree of 84.80% and Fe metallization degree of 11.16%.Increasing the charging temperature is beneficial to improving the recovery rates of Ni and Fe.Furthermore,an Fe-Ni alloy containing 87.90%Fe and 7.32%Ni was obtained at a smelting temperature of 1575℃ for 45 min with a charging temperature of 1000℃,achieving Ni and Fe recovery rates of 94.91% and 78.67%,respectively.展开更多
基金the financial support from the National Natural Science Foundation of China(Nos.52404356 and 52174329)the National Key R&D Program of China(2023YFC3903900 and 2023YFC3903904)Guangxi Key Technologies R&D Program(AA24206042).
文摘The rotary kiln and electric furnace melting process is the primary pyrometallurgical method for producing Fe-Ni alloy from nickel laterite.During the drying and preheating stages in the rotary kilns,nickel laterite briquettes tend to generate significant amounts of powder because of insufficient heating.These fine powders not only contribute to ring formation within the kiln but also impair the gas permeability of electric furnaces,thereby increasing their power consumption.Replacing the rotary kiln with a traveling grate can significantly improve the strength of reduced briquettes and enhance the discharge temperature.Under a reduction temperature of 1000℃ for 10 min,using green briquettes containing 8 wt.% coal processed through a traveling grate,the reduced briquettes achieved cold compressive strength of 449.7 N/briquette,dropping strength of 88.00%,tumbler strength of 83.49%,Ni metallization degree of 84.80% and Fe metallization degree of 11.16%.Increasing the charging temperature is beneficial to improving the recovery rates of Ni and Fe.Furthermore,an Fe-Ni alloy containing 87.90%Fe and 7.32%Ni was obtained at a smelting temperature of 1575℃ for 45 min with a charging temperature of 1000℃,achieving Ni and Fe recovery rates of 94.91% and 78.67%,respectively.
