A kind of production method of high magnesium pellets

Abstract

The invention discloses a production method of high-magnesium pellets. The specific steps are as follows: mix magnesium oxide powder into bentonite to make magnesia bentonite, mix magnesia bentonite into iron concentrate powder, and then add magnesia bentonite Bentonite is used as a mixture; the mixture is mixed with a mixer and transported to the pelletizing disc in the pelletizing chamber through a belt, and the above-mentioned mixture and water are added to the disc pelletizer to form pellets to obtain raw pellets; After the green balls are screened, dried, preheated, roasted and cooled, high-magnesium pellets are obtained. In the present invention, since bentonite and magnesium oxide powder are mixed and ground first, the affinity between bentonite and fine iron powder has been improved, which is beneficial to the roasting of green balls, and effectively improves the powder, poor atmosphere and cooling during the roasting process. In a bad situation, the output is not affected, the production process is easy to control, and the ringing of the rotary kiln is delayed, the production of high-magnesium pellets is normalized, and the quality index meets the index requirements of the steel plant.

Description

technical field [0001] The invention relates to the technical field of pellet production for blast furnace ironmaking, in particular to a production method of high-magnesium pellets. Background technique [0002] With the increasingly fierce competition in the iron and steel market, reducing the cost of ironmaking has become a trend for major iron and steel enterprises to seek development. However, with the change of raw material varieties and the improvement of the grade of incoming raw materials, the amount of slag decreases, resulting in poor fluidity of slag. To improve the fluidity of slag, the usual method is to increase the MgO content in the charge, and all the MgO required in the charge is provided by sinter, but only adding too much MgO to sinter will seriously affect the output of sinter. Therefore, some steel mills transfer part of the MgO in the sinter to the pellets to increase the output and quality of the sinter, improve the metallurgical performance of the p...

AI Technical Summary

Problems solved by technology

[0002] With the increasingly fierce competition in the iron and steel market, reducing the cost of ironmaking has become a trend for major iron and steel enterprises to seek development. However, with the change of raw material varieties and the improvement of the grade of incoming raw materials, the amount of slag decreases, resulting in poor fluidity of slag. To improve the fluidity of slag, the usual method is to increase the MgO content in the charge, and all the MgO required in the charge is provided by sinter, but only adding too much MgO to sinter will seriously affect the output of sinter. Therefore, some steel mills transfer part of the MgO in the sinter to the pellets to improve the output and quality of the sinter, and at the same time improve the metallurgical performance of the pellets, and further improve the economic and technical indicators of the blast furnace

[0003] At present, most pellet production enterprises mostly use the mixture of iron concentrate powder, magnesium oxide powder and bentonite directly as the raw material for producing magnesium-containing pellets. This preparation method has been verified in laboratory tests and is feasible. However, in the actual production process of this production method, the dry ball quality is not good, the surface of the kiln head ball sticks to powder, the atmosphere in the kiln is poor, and the ring formation in the kiln is faster, and the output is reduced by about 10%.