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Iron ore pellet and its preparation method

A technology of iron ore pellets and iron ore, which is applied in the field of iron ore pellets and its preparation, can solve the problems of reducing concentrate grade, poor green pellet strength, and bringing in impurities, so as to improve metallurgical performance, increase strength, and reduce coke than the effect

Inactive Publication Date: 2006-07-26
WUHAN UNIV OF SCI & TECH
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  • Application Information

AI Technical Summary

Problems solved by technology

Generally speaking, inorganic binders have the characteristics of good thermal stability and good strength of dry pellets, but there will inevitably be poor green pellet strength, bringing in impurities, reducing the grade of concentrate, etc.
Although existing organic binders have high green pellet strength, they generally have problems such as poor thermal performance and high price (Huang Tianzheng, Research Status and Development of Pellet Additives, Sintered Pellets, 1997, 22 (3) :1-7)

Method used

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Embodiment Construction

[0014] A kind of preparation method of iron ore pellet, its specific embodiment is:

[0015] 1, the iron ore that present embodiment adopts is: TFe is 63~66wt%, CaO is 1~2wt%, MgO is 1~3wt%, SiO 2 4~6wt%, Al 2 o 3 0.2-0.3wt% for S, 0.05-0.2wt% for S;

[0016] 2, the binding agent that present embodiment adopts is: binding agent is that 25~35% of sodium carboxymethyl starch, 5~10% of polyacrylamide, 1~5% of sodium humate, water resistant 30-40% of putty powder, 3-5% of kaolin, 8-10% of ferrous sulfate, and 5-10% of sodium carbonate are finely ground and mixed, and the content of finely ground to a particle size of ≤0.074mm is ≥80%. The molecular weight of polyacrylamide is more than 3 million.

[0017] 3. The preparation method of this embodiment is: adding 2.5-3.5 wt% of forsterite and 0.3-0.5 wt% of binder to the iron ore concentrate. Among them, the forsterite has a particle size content of ≤0.074mm and a content of ≥90%, and the MgO of the forsterite is more than 40%wt...

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Abstract

The invention discloses an iron ore pellet preparing method, Which comprises the following steps: putting 2-4wt% forsterite and 0. 2-0. 8wt% agglomerant in iron ore; mixing up water (the water content of mixture: 6-11wt%); making ball and drying; preheating at the temperature of 900-1000 deg. c for 15-25min; roasting at the temperature of 1260-1320deg. c for 20-40min; mixing up 20-40% jevigating, 5-10% polyacrylamide, 0-5% polypropylene, 0-5% sodium humate, 20-40% twaterproof putty powder, 3-5% caoline and 5-10% copperas in mass fraction to obtain agglomerant. The invention can improve the strength of green-ball and the heat endurance.

Description

1. Technical field [0001] The invention belongs to the ironmaking raw material pelletizing technology. In particular, it relates to an iron ore pellet and a preparation method thereof. 2. Background technology [0002] The goal of blast furnace ironmaking production is high quality, low consumption, and high yield, and the concentrate is the material basis for blast furnace high quality, low consumption, and high yield. Intensified blast furnace smelting both at home and abroad puts the concentrate in the first place. Since the 1980s, from a global perspective, pellet production has entered the third stage of development, from output to quality. Pellet manufacturers began to shift from pursuing pellet quantity to improving pellet quality, reducing cost and improving process. Basically start from the following aspects: [0003] Improve the composition of pellets. Due to the rapid development of blast furnace smelting technology and the accelerated operation speed, simple...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/14
Inventor 张一敏陈铁军刘涛
Owner WUHAN UNIV OF SCI & TECH
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