Method for reducing energy consumption of ferronickel production adopting RKEF technology

Abstract

The invention provides a method for reducing the energy consumption of ferronickel production adopting an RKEF technology. According to the method, pre-reduced calcine with the content of ferrous oxide of 15-25% serves as early slags for smelting, and the content of the ferrous oxide in final slags is controlled to be 5-15% in the smelting process; the early slags comprise CaO, MgO, Al2O3, SiO2 and FeO; and in the early slags, the mass percentage of calcium oxide is 1-10%, the mass percentage of aluminum oxide is 2-10%, and the mass ratio of magnesium to silicon 0.5-0.7. according to the method, by means of reasonable selection, regulation and control of a laterite-nickel ore slag system, the reduction atmosphere is enhanced to selectively reduce iron oxide in the pre-reducing and smeltingprocesses, under the common regulation and control effect of different components of the slag system, the generation temperature of early slag liquid phase of laterite-nickel ore materials in an electric furnace is decreased, the generation speed is increased, the smelting temperature is decreased by 50-90 DEG C, and therefore the electricity consumption required for smelting the ferronickel canbe effectively reduced. The method has the advantages that the technological energy consumption of production of the ferronickel using the laterite-nickel ore and adopting RKEF technology can be remarkably reduced, and the production cost of the ferronickel can be lowered by 5-10%.

Description

technical field [0001] The invention discloses a method for reducing the energy consumption of ferronickel production in the RKEF process, and belongs to the technical field of metallurgy. Background technique [0002] Stainless steel is an important raw material in national economic construction. In 2016, the global stainless steel output reached 45.78 million tons, and its output will maintain a certain growth trend in the future. In recent years, my country's stainless steel industry has achieved rapid development, and the output and apparent consumption of stainless steel crude steel have ranked first in the world for many years. In 2016, domestic crude stainless steel production reached 24.938 million tons, and apparent consumption was 18.835 million tons. Compared with the output and apparent consumption in 2010, the growth rates exceeded 120% and 100% respectively. [0003] Nickel is mainly used in the production of stainless steel. Traditional stainless steel produ...

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Problems solved by technology

[0007] Aiming at the significant problem of high energy consumption in the production process of ferronickel by laterite nickel ore rotary kiln-electric furnace smelting, the present invention provides a method for reducing the energy consumption of ferronickel production in the RKEF process. Reasonable selection and regulation to reduce the temperature required for electric furnace smelting, thereby reducing power consumption during the smelting process

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