Raw material and method for producing magnesium pellets by using belt type machine

Abstract

The invention discloses a raw material and method for producing magnesium pellets by using a belt type machine. The method comprises the steps of sufficiently mixing an iron-containing raw material, serpentine and bentonite in an intensive mixer to obtain a mixture, wherein the serpentine accounts for 1.0-2.5% of the mixture, and the bentonite accounts for 2% of the mixture; pelletizing the mixture in a pelletizing pan to obtain green pellets; drying the green pellets on a forced air drying zone and an induced-draft drying zone of the belt type machine, preheating the green pellets on a preheating zone, roasting the green pellets on a roasting zone, recrystallizing the green pellets on a soaking zone, and cooling the green pellets on a first cooling zone and a second cooling zone to finally obtain the magnesium oxidized pellets. According to the method, the serpentine is used as a magnesium additive for producing the magnesium pellets, and the metallurgical performances of the pellets with special baiyenebo iron concentrate ratio can be remarkably improved by virtue of a technical measure that the serpentine is added.

Description

technical field [0001] The invention belongs to a pelletizing technology for ironmaking raw materials, in particular to a raw material for producing magnesia pellets by a belt machine and a production method for the magnesia pellets. Background technique [0002] Whether the blast furnace production can go smoothly is closely related to the performance of the slag, and the performance of the slag is affected by many factors, the most important of which is the composition of the slag. Metallurgists at home and abroad have found through a large number of studies that appropriately increasing the MgO content of slag plays a very good role in improving the fluidity and stability of slag, improving the comprehensive metallurgical properties of slag, and reducing the silicon content of pig iron. Previous studies have done a systematic study on the optimization of MgO in the blast furnace charge structure. It is believed that appropriately increasing the MgO content in the slag can...

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Problems solved by technology

[0003] Comparing the metallurgical properties of Baotou Steel sinter and pellets, it can be seen that the reflow temperature of Baotou Steel sinter is much higher than that of pellets, which makes the temperature range of the comprehensive charge reflow zone thicker. The sinter reduces the MgO content and the pellet increases the MgO content, the sinter reflow temperature decreases, and the pellet reflow temperature increases, so that the melting temperature range of sinter and pellet tends to be consistent, so that the temperature of the entire charge reflow zone interval thinning

At present, there is no related research on magnesium pellets for the belt machine process

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