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Organic binder, application of organic binder in pellet preparation, organic-inorganic composite binder and application of organic-inorganic composite binder

An organic binder and inorganic composite technology, applied in the organic binder and its application in the preparation of pellets, in the field of organic-inorganic composite binders, can solve the problem of reducing the compressive strength of preheating balls and roasting balls , furnace condition deterioration, etc.

Active Publication Date: 2021-08-24
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, whether it is "Pellido" or organic small molecules, in order to ensure a good bonding effect, their dosage needs to reach about 0.5wt% of the iron concentrate mass. Such a high dosage of organic binder will form during the roasting process. Reducing atmosphere reduces the compressive strength of preheating balls and roasting balls, resulting in poor furnace conditions

Method used

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  • Organic binder, application of organic binder in pellet preparation, organic-inorganic composite binder and application of organic-inorganic composite binder
  • Organic binder, application of organic binder in pellet preparation, organic-inorganic composite binder and application of organic-inorganic composite binder
  • Organic binder, application of organic binder in pellet preparation, organic-inorganic composite binder and application of organic-inorganic composite binder

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[0032] In terms of mass percentage, the organic binder provided by the present invention includes 1-2% polyether, preferably 1.2-1.8%, more preferably 1.5%. In the present invention, the polyether is preferably an EO / PO block polyether, and the molecular weight of the polyether is preferably 1000-2000, more preferably 1200-1800, and even more preferably 1500. The present invention has no special requirements on the source of the polyether, and can use conventional commercially available polyether in this field or self-preparation; when the polyether is self-prepared, the preparation method of the polyether preferably includes the following steps:

[0033] One or more of ethylene oxide, propylene oxide and butylene oxide are used as raw materials to carry out ring-opening polymerization under the action of a catalyst to obtain polyether.

[0034] In terms of mass percentage, the organic binder provided by the invention also includes 16-17% of water, preferably 16.5%.

[0035] ...

Embodiment 1～3

[0059] According to the dosage in Table 1, the raw materials were mixed and finely ground to prepare an organic binder, wherein the number average molecular weight of polyethylene was 7 million, polyether EO / PO block polyether, the number average molecular weight of the polyether for 1500.

[0060] The raw material consumption of table 1 embodiment 1~3 organic binder

[0061]

[0062]

Embodiment 4～6

[0086] The natural calcium-based bentonite is mixed with the organic binder obtained in Example 2, and ground until the content of particles with a particle size below -0.074 mm is not less than 100%, to obtain an organic-inorganic composite binder. The dosage of natural calcium-based bentonite and organic binder is shown in Table 3.

[0087] The raw material consumption of the organic-inorganic composite binder obtained in table 3 embodiment 4~6

[0088] Example 4 Example 5 Example 6 Natural calcium-based bentonite / g 100 100 100 Organic binder / g 0.3 0.4 0.5

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Abstract

The invention provides an organic binder, and belongs to the technical field of pellet binders. The organic binder comprises the following components in percentage by mass: 15%-16% of carbon black, 27.5%-28.5% of dolomite, 0.5%-1.5% of glycerol, 37%-38% of polyethylene, 1%-2% of polyether, and 16%-17% of water. According to the invention, by controlling the components and the use amount of the organic binder, the organic binder can be guaranteed to still play a good binding effect under the condition that the use amount is extremely low (0.003 wt% to 0.005 wt%), the organic binder is fully dispersed and combusted in a pelletizing process, and the grade of pellets is not reduced. Results of the embodiment show that green pellets and finished pellets obtained under the condition that the use amount of the organic binder is 0.003 wt% to 0.005 wt% of iron ore concentrate are high in strength and quality.

Description

technical field [0001] The invention relates to the technical field of pellet binders, in particular to an organic binder and its application in preparing pellets, an organic-inorganic composite binder and its application. Background technique [0002] In the iron and steel industry, pellets have the advantages of uniform particle size, high strength, suitable for long-distance transportation and storage, good iron grade, and good metallurgical properties, which are conducive to improving the gas permeability of the material column during smelting and reducing the coke ratio. In recent years, pellets account for an increasing proportion of blast furnace ironmaking raw materials. [0003] Adding a binder to the pelletizing material can effectively improve the pelletizing property of the pelletizing material, increase the molecular binding force between the particles in the green pellets, and thus improve the strength and thermal stability of the pellets. So far, bentonite is...

Claims

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Application Information

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IPC IPC(8): C22B1/244C22B1/242
CPCC22B1/244C22B1/2406C22B1/242
Inventor 李骞杨永斌李科马永和徐斌陈许玲姜涛龙文革
Owner CENT SOUTH UNIV
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