High-alkalinity composite metallized pellet for converter and production process thereof

Abstract

The invention relates to the technical field of metallurgical and mineral engineering and discloses a high-alkalinity composite metallized pellet for a converter and a production process thereof. The pellet comprises an inner core and a shell wrapping outside the inner core, wherein the inner core is prepared through mixing coal powder, limestone and cement according to the mass ratio of 100: (300-550): (4-7), the shell is prepared through mixing iron concentrate and bentonite according to the mass ratio of (1,500-1,800): (30-54), the granularity of the inner core is 20-25mm, and the thickness of the shell is 5-10mm; the outside of the shell is further covered with a layer of reducing agent. The production process comprises the steps of preparing the inner core, wrapping the shell to form the composite metallized pellet, wrapping the external wall of the composite metallized pellet with a reducing layer, distributing and drying the composite metallized pellet, carrying out reduction roasting on the composite metallized pellet, cooling and separating the high-temperature-reduction composite metallized pellet, and the like. According to the high-alkalinity composite metallized pellet and the production process thereof, through proportionally adding the limestone and the coal powder into the inner core, the internal reducing atmosphere of the pellet is strengthened, the reduction rate is increased, and the energy consumption is lowered.

Description

technical field [0001] The invention relates to the technical field of metallurgy and mineral engineering, and discloses a large-sized high-alkalinity composite metallized pellet for a converter capable of replacing scrap steel and limestone and a production process thereof. Background technique [0002] At present, the production process of metallized pellets used in converters is as follows: after mixing high-grade iron concentrate and bentonite in a certain proportion, pellets with a particle size of 8-16mm are made through a disc pelletizer, and the pellets are passed through After low-temperature drying, it is mixed with a certain proportion of reduced coal, and the mixed material is added to the reduction furnace kiln (such as shaft furnace, rotary kiln, tunnel kiln and rotary hearth furnace, etc.) for reduction, and high-grade, high metallization rate can be obtained Metallized pellets, due to the long reduction time, low production capacity and high energy consumptio...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a high-basicity composite metallized pellet for converter and its production process, to solve the problems of small particle size, long production time, high energy consumption, and high energy consumption of the metallized pellet for converter. The problem of adding quicklime

Images