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Abstract
A novel smelting reduction process called pre-reduction in rotary kiln and total oxygen melting pool is a promising route to reduce environmental pollution from the ironmaking industry. In this paper, the process parameters and appropriate efficiency of reduction in the pre-reduction process of the rotary kiln were investigated via the detection of the metallization rate, phase composition, and internal morphology of the product combining with the analysis of the off-gas. The results indicated that the parameters of reduction temperature, reduction holding time, and coal ratio have a remarkable influence on the metallization rate. The reduction temperature has the most significant effect, followed by the reduction time and the coal ratio. Furthermore, under the condition of reduction temperature 1000 °C, holding time 30 min, coal ratio = 1, a product with a metallization rate of more than 70% can be obtained, which meets the requirements of the rotary kiln process, and its CO2/CO value of the pre-reduction endpoint is appropriate. Continue to increase the temperature, holding time, and coal ratio can raise the metallization rate of the pellets, but only a little improvement and may cause reoxidation of the product.
Highlights
Ironmaking and steelmaking manufacturing is one of the most energy-intensive industries worldwide, using coal as the primary fuel making it the major contributor to the anthropogenic emissions of carbon dioxide in the world [1]
Through the establishment of mathematical model calculations and laboratory experiments [12,13], the Central Iron and Steel Research Institute has verified that using this process to smelt vanadium-titanium magnetite is technically feasible, and has great advantages in energy saving and environment protection compared with traditional blast furnace (BF) process
Orthogonal Tests Result for Lignite Containing vanadium-titanium magnetite (VTM) Composites
Summary
Ironmaking and steelmaking manufacturing is one of the most energy-intensive industries worldwide, using coal as the primary fuel making it the major contributor to the anthropogenic emissions of carbon dioxide in the world [1]. Institute creativelyInstitute put forward a novelput ironmaking resources, Iron and creatively forward process a novel of pre-reduction in rotary kiln and total melting pool oxygen (PROM)melting [12,13],pool as shown in ironmaking process of pre-reduction in oxygen rotary kiln and total (PROM) Through the establishment of mathematical model calculations and laboratory experiments [12,13], the Central Iron and Steel Research Institute has verified that using this process to smelt vanadium-titanium magnetite is technically feasible, and has great advantages in energy saving and environment protection compared with traditional BF process. The goal of the demonstration project of this new process is to reduce the energy consumption per ton of molten iron by 30%, reduce production costs by 10% to 15%, and reduce pollutant emissions by 50% to 80% compared with traditional blast furnaces. Our study is expected to provide a theoretical basis and reference for the industrialization experiment of the new ironmaking process
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