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Method for producing oxidized pellet using organic binder fully instead of bentonite

An organic binder and oxidizing pellet technology, which is applied in the field of iron and steel metallurgy, can solve the problems of difficult dispersion, low qualification rate of green balls, and reduced strength of finished balls, etc. The effect of increased ball rate

Inactive Publication Date: 2009-05-06
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, the current application of organic binders to prepare oxidized pellets still has the following problems: (1) due to the high hydrophilicity and high cohesiveness of organic binders, when they are added to hydrous iron concentrates, the binders It is easy to form agglomerates when exposed to water. After the outer layer absorbs water, it forms a viscous and tough mucous membrane. Even with a strong mixer, it is difficult to disperse the bonded binder, which makes it difficult to disperse in iron concentrate. Uniform, large balls are easy to form during the pelletizing process, and the quality of the green pellets is not uniform, which makes the qualified rate of the green pellets low and brings great difficulties to the pelletizing process; (2) Due to the small amount of organic binder, the addition process (3) Because the organic binder decomposes or burns to form micropores during the drying and preheating process, for some concentrates, the strength of the finished balls is lower than that of the pellets prepared by bentonite. greater degree of reduction
The above-mentioned difficulties limit the application of organic binders in the production of oxidized pellets in my country, and the current industrial tests are limited to the application of organic binders to replace part of bentonite

Method used

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  • Method for producing oxidized pellet using organic binder fully instead of bentonite

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Experimental program
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preparation example Construction

[0036] (2) Preparation of carrier-type organic binder

[0037] Add the organic binder to the carrier, the organic binder / carrier ratio is 1 / 50 to 1 / 10 (depending on the amount of the organic binder and the amount of the carrier binder added), the organic binder and The carrier is mixed evenly under the action of stirring to prepare a carrier-type organic binder with an organic binder mass fraction of 2-10%.

[0038] (3) Preparation of pellets

[0039] Dry the iron concentrate until the water content is 6-8%, add 1%-2.5% carrier-type organic binder to the iron concentrate, mix the iron concentrate and binder, and moisten the mixture The mechanical action of grinding or high-pressure roller mill, and then send the mixture to the pelletizing disc to make green balls with a diameter of 10-16mm. Roasting can use shaft furnace, belt machine or grate machine-rotary kiln process. See attached for specific process figure 1 . Taking the grate machine-rotary kiln pellet production p...

Embodiment 1

[0042] Embodiment 1: adopt the iron ore concentrate with excellent consolidation performance, the weight ratio of organic binder and carrier iron ore concentrate is 6:94, add the carrier type binder of 1.0% (weight) (can be calculated to obtain organic binder The agent consumption is 6 / 100 * 1.0%=0.06%) to replace 2% bentonite, adopts the high-pressure roller mill process, the mixture moisture before the roller mill is 6.5% (weight), preheating temperature 980 ℃, roasting temperature 1250 ℃. The pellet indicators are: the drop strength of green balls is 5.5 times / (0.5m·piece), the compressive strength is 12.6N / piece, the burst temperature is greater than 600°C, the strength of preheated balls is 483N / piece, and the strength of finished balls is 2563N / piece. Compared with pellets with bentonite as binder, iron grade increased by 1.2%, SiO 2 Content (weight) decreased by 1.3%.

Embodiment 2

[0043] Example 2: Using iron ore concentrate with excellent consolidation performance, the weight ratio of organic binder to carrier sulfuric acid slag is 6:94, and 1.0% (weight) carrier binder is added (the amount of organic binder is 0.06%) Instead of 2.5% bentonite, a wet grinding process is adopted, the moisture content of the mixture before the wet grinding is 6.5% (weight), the preheating temperature is 980° C., and the roasting temperature is 1250° C. The pellet indicators are: the drop strength of green balls is 6.0 times / (0.5m·piece), the compressive strength is 12.7N / piece, the burst temperature is greater than 600°C, the strength of preheated balls is 497N / piece, and the strength of finished balls is 2675N / piece. Compared with pellets with bentonite as binder, iron grade increased by 1.5%, SiO 2 The content decreased by 1.9% by weight.

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Abstract

The invention discloses a method for producing oxidized pellets by completely substituting organic binder for bentonite. Aiming at different types of iron concentrate, the method introduces two types of organic binder carriers, namely an iron-containing raw material and limestone or dolomite. The two types of carriers both have pre-dispersing function and the characteristic of leading in no acid gangue, and can strengthen the strength of the pellets. The method comprises the following steps of adding the organic binder into the carriers, stirring and well mixing the binder and the carriers, so as to prepare carrier-type organic binder with the mass percent of the organic binder between 2 and 10 percent. 1.0 to 2.5 percent of the carrier-type organic binder is added into the iron concentrate, and can completely replace the bentonite. The method overcomes the disadvantage that acid gangue is led in after the bentonite is added into the pellets, and simultaneously breaks through the limitation that the organic binder can not be completely substituted for the bentonite under the conditions of the prior art.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and relates to a method for completely replacing bentonite with an organic binder and mixing it with iron concentrate to prepare oxidized pellets. Background technique [0002] Oxidized iron ore pellets have the advantages of uniform particle size, high cold strength, high iron grade, and good reducibility. They are a high-quality blast furnace charge. In recent years, oxidized pellets have developed rapidly in my country, and the annual production capacity has reached 100 million tons. above. Iron concentrate pelletizing needs to add binder to make the pellets have a certain strength, which can keep them intact and not broken during the process of operation, drying, roasting, etc., and meet the requirements of blast furnace smelting. Bentonite is generally used as a binder in my country's pellet production, and the amount used is relatively high compared with foreign countries, mostly in...

Claims

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Application Information

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IPC IPC(8): C22B1/244
CPCY02P10/20
Inventor 范晓慧姜涛李光辉甘敏陈许玲袁礼顺白国华赵改革王祎
Owner CENT SOUTH UNIV
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