Composite binder for iron ore pellets and preparation method thereof

A binder and iron ore ball technology, which is applied in the composite binder of iron ore pellets and its preparation field, can solve the problems of large amount of binder, low compressive strength of finished balls, and high price, and achieve good adhesion The effects of junction performance and medium temperature stability, improved strength of finished balls, and convenience in transportation and use

Inactive Publication Date: 2011-03-16
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally speaking, the thermal stability of the inorganic binder is good, and the compressive strength of the dry ball produced is also good, but it is inevitable that the amount of the binder is large, the strength of the green ball is poor, and impurities are brought in, which reduces the strength of the ball. However, although the existing organic binder has good cohesiveness and spheroidization, less impurities are brought in, and the grade of the finished ball is high, the thermal performance is generally poor. The high price and the physical and metallurgical properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A composite binder for iron ore pellets and its preparation method: first mix 40-50 wt% of sodium bentonite and 50-60 wt% of rectorite, add 0.1-1 wt% of additives, and then mix Uniformly and finely ground to a particle size of less than 200 meshes to obtain a composite binder for iron ore pellets.

[0023] The additives in this example are tackifier and reinforcing agent mixed and finely ground at a mass ratio of 1: (1.5-3) until the particle size is less than 200 mesh; wherein: the tackifier is polyacrylamide and modified starch, and the reinforcing agent is carboxyl Sodium Methylcellulose.

[0024] The composite binder prepared in this example is used in the production of iron ore pellets, and the dosage is 0.4 to 1.2 wt% of the total mass of raw materials. After cooling, the finished pellets are tested by industry standards, and the results are: The drop strength of balls is 6.4-7.5 times / piece; the compressive strength of green balls is 13.5-15.2N / piece; the compre...

Embodiment 2

[0026] A composite binder for iron ore pellets and its preparation method: first mix 48-60 wt% of sodium bentonite and 40-52 wt% of rectorite, add 0.1-1 wt% of additives, and then mix Uniformly and finely ground to a particle size of less than 200 meshes to obtain a composite binder for iron ore pellets.

[0027] The additives in this example are tackifiers and reinforcing agents mixed and finely ground in a mass ratio of 1: (2-4) until the particle size is less than 200 meshes; wherein: the tackifiers are polyacrylamide and polyethylene oxide, and the reinforcing agents are carboxyl Sodium Methylcellulose.

[0028] The composite binder prepared in this example is used in the production of iron ore pellets, and the dosage is 0.4 to 1.2 wt% of the total mass of raw materials. After cooling, the finished pellets are tested by industry standards, and the results are: The drop strength of balls is 5.7-6.9 times / piece; the compressive strength of green balls is 13.5-14.8N / piece; t...

Embodiment 3

[0030] A composite binder for iron ore pellets and a preparation method thereof: first mix 55-65 wt% of sodium bentonite and 35-45 wt% of rectorite, add 0.1-1 wt% of additives, and then Mix evenly, finely grind until the particle size is less than 200 mesh, and obtain the composite binder for iron ore pellets.

[0031] The additives in this example are tackifier and reinforcing agent mixed and finely ground in a mass ratio of 1: (1.5-2.5) until the particle size is less than 200 mesh; wherein: the tackifier is modified starch and polyethylene oxide, and the reinforcing agent is carboxyl Sodium Methylcellulose.

[0032] The composite binder prepared in this example is used in the production of iron ore pellets, and the dosage is 0.4 to 1.2 wt% of the total mass of raw materials. After cooling, the finished pellets are tested by industry standards, and the results are: The drop strength of balls is 5.6-6.5 times / piece; the compressive strength of green balls is 12.6-14.8N / piece...

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Abstract

The invention in particular relates to a composite binder for iron ore pellets and a preparation method thereof. The technical scheme is that the method comprises the following steps of: mixing 40 to 70 weight percent of sodium bentonite and 30 to 60 weight percent of rectorite; adding 0.1 to 1 weight percent of additive; uniformly mixing; and grinding until the particle size is less than 200 meshes to obtain the composite binder for the iron ore pellets, wherein the additive is prepared by mixing an adhesion promoter and a reinforcing agent in the mass ratio of 1:(1.5-9) and grinding the mixture until the particle size is less than 200 meshes; the adhesion promoter is more than two of polyacrylamide, modified starch and polyethylene oxide; and the reinforcing agent is one of carboxymethyl cellulose and humic acid salt. By the method, the equipment investment is not increased, the original production process is not changed and the quality of the pellets can be improved; and the composite binder prepared by the method has the characteristics of improving compression strength and dropping strength of green pellets, compressive strength and cracking temperature of dry pellets, compressive strength of and total iron grade of finished pellets.

Description

technical field [0001] The invention belongs to the technical field of iron ore pellets, and in particular relates to a composite binder for iron ore pellets and a preparation method thereof. Background technique [0002] Pellets have the advantages of uniform particle size, high cold strength, high iron grade, and good reducibility, and are an indispensable high-quality furnace charge (Zhang Yimin. Pellet Production Technology. Beijing: Metallurgical Industry Press, 2005, 1 -13), it has played an obvious positive role in optimizing the structure of the blast furnace charge, improving the technical and economic indicators of ironmaking, promoting energy saving and reducing consumption, and achieving environmental friendliness. [0003] Binder is an indispensable component in iron ore pellets. Studies have shown that a binder with good performance has very obvious practical significance for improving the quality of pellets and the economic and technical indicators of ironmak...

Claims

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Application Information

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IPC IPC(8): C22B1/243
Inventor 钱功明杨福吴志清程建文
Owner WUHAN UNIV OF SCI & TECH
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