Acidic magnesia pellet and preparation method thereof

Abstract

The invention relates to an acidic magnesia pellet and a preparation method thereof. 90-95 percent of magnetite powder, 1-2 percent of bentonite and 4-8 percent of magnesite powder with grain size of 200 meshes are blended with magnesite powder and bentonite in a batching room for dry mixing, and in the controlled pellet raw material, MgO / SiO2 is equal to 0.4-0.55; and meanwhile, the roasting temperature is kept between 1250 DEG C and 1300 DEG C, thus the acidic magnesia pellet can be produced. The low-temperature reduction degradation index of the pellet is improved under the conditions without increasing the equipment investment and changing the original process, and the low-temperature reduction expansion rate is reduced by 50 percent; the softening temperature of the pellet is raised by 120-150 DEG C, the high-temperature metallurgical property of the pellet is enhanced and the smelting conditions of the blast furnace are improved; and the invention is adequate in raw materials, simple in production process and convenient for operation and grasping and has the superiority and the value for the increase of the use proportion of the pellet and the broad popularization.

Description

technical field [0001] The invention belongs to the technical field of iron-making raw material pellets, and in particular relates to a magnetite concentrate powder mixed with magnesium stone powder to produce acidic magnesia pellets and a preparation method thereof. Background technique [0002] The material structure of the blast furnace is an important prerequisite and material basis for ironmaking production to achieve high quality, low consumption, and high output, so it has always been paid attention to and valued by people, and a lot of money and energy have been invested in the production process of blast furnace raw materials. A lot of advanced technical means are used to change the composition of pellets, and then improve the metallurgical properties of raw materials. A lot of work has been done to achieve the goals of high quality, low consumption, and high yield, and certain results have been achieved. [0003] At present, the output of domestic pellets has incre...

AI Technical Summary

Problems solved by technology

But its disadvantages are: first, it needs special preparation of binder composed of sodium carboxymethyl starch, polyacrylamide, sodium humate, water-resistant putty powder, kaolin, ferrous sulfate and sodium carbonate; second, the raw materials need to be mixed with water , it is difficult to mix evenly; the third is that there are many preparation processes, and the process is slightly complicated

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