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
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  • Claims
  • Application Information

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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 th

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

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Example Embodiment

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

[0037] Add the organic binder to the carrier. The ratio of organic binder / carrier is 1 / 50~1 / 10 (depending on the amount of organic binder and the amount of carrier binder added). 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 to a moisture content of 6-8%, add 1%-2.5% carrier-type organic binder to the iron concentrate, mix the iron concentrate and the binder, and pass the mixture through lubrication. The mechanical action of the mill or high-pressure roller mill, and then the mixture is sent to the pelletizing disc to make green balls with a diameter of 10-16mm. Roasting can use shaft furnace, belt machine or chain grate-rotary kiln process. See attached for specific process figure 1 . Take the chain grate-rotary kiln pellet production process commonly used in...

Example Embodiment

[0042] Example 1: Using iron ore concentrate with excellent consolidation properties, the weight ratio of the organic binder to the carrier iron concentrate is 6:94, and 1.0% (weight) of the carrier type binder is added (the organic bond can be calculated The dosage is 6 / 100×1.0%=0.06%) instead of 2% bentonite, adopts high-pressure roller milling process, the water content of the mixture before roller milling is 6.5% (weight), the preheating temperature is 980℃, and the baking temperature is 1250℃. The pellet indicators are: the green ball drop strength is 5.5 times / (0.5m·piece), the compressive strength is 12.6N / piece, the burst temperature is greater than 600℃, the preheated ball strength is 483N / piece, and the finished ball strength is 2563N / piece. Compared with the pellets with bentonite as the binder, the iron grade is increased by 1.2%, and the SiO 2 The content (weight) decreased by 1.3%.

Example Embodiment

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