A method of increasing the bursting temperature of pellets made of ultra-fine iron concentrate

A technology of pelletizing ore and iron concentrate, which is applied in the field of improving the bursting temperature of ultra-fine iron concentrate pellets and the production of ironmaking raw material pellets. It can solve the problems of low pelletizing temperature and high manufacturing cost, and achieve improvement. Particle size distribution, guaranteed adaptability, and the effect of increasing the burst temperature

Active Publication Date: 2019-02-05
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for increasing the bursting temperature of pellets made of ultra-fine-grained iron concentrate, which mainly solves the problems of low bursting temperature and high manufacturing cost of existing pellets made of ultra-fine-grained iron concentrate technical problem

Method used

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  • A method of increasing the bursting temperature of pellets made of ultra-fine iron concentrate
  • A method of increasing the bursting temperature of pellets made of ultra-fine iron concentrate
  • A method of increasing the bursting temperature of pellets made of ultra-fine iron concentrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1, 30% of the pellet inner layer material, 70% of the pellet outer layer material; the percentage by weight of each component of the pellet ore inner layer material is: 32.4% of the original Australian ore, 17.6% of the Australian concentrate, and 17.6% of the Meishan concentrate 49.0%, bentonite 1.0%; the weight percentages of the components of the pellet outer layer are: Australian raw ore 63.7%, Australian concentrate 35.3%, bentonite 1.0%; components of different particle sizes in Australian raw ore, Australian concentrate and Meishan concentrate The weight percentage is shown in Table 2,

[0023] The percentage by weight of different particle size components in the raw material of table 2 embodiment 1, %

[0024] category

>0.074mm

0.074-0.043mm

0.043-0.037mm

<0.037mm

Australian ore

0.60

3.40

4.90

91.10

Australian Concentrate

0.05

5.45

5.50

89.00

Meishan Concentrate

36.00

19.20

...

Embodiment 2

[0040] Embodiment 2, the basic content of embodiment 2 is as embodiment 1, and its difference is: the percentage by weight of each component of pellet outer layer material is: Australian raw ore 63.5%, Australian concentrate 35.3%, bentonite 1.2%. The detonation temperature of the pellets obtained in Example 2 is 375°C.

[0041] Compared with Example 1, although the bentonite in the outer layer of pellets in Example 2 is only increased from 1.0% to 1.2%, the bursting temperature of the pellets is significantly improved. Thereby increasing the strength of the green pellets and the tensile strength of the dry shell, so that the excess vapor pressure generated by the drying front in the inner pellets is smaller than the tensile strength of the green pellets and the dry shell, thereby significantly improving the iron concentrate oxide pellets. burst temperature of the cluster.

Embodiment 3

[0042] Embodiment 3, the basic content of embodiment 3 is as embodiment 1, and its difference is: the percentage by weight of each constituent of pellet inner layer material is: Australian raw ore 30.0%, Australian concentrated ore 15.0%, Meishan concentrated ore 54.25% %, bentonite 0.75%; the percentage by weight of each component of the pellet outer layer material is: 58.5% of Australian raw ore, 40.0% of Australian concentrate, 1.5% of bentonite, and the bursting temperature of the pellet obtained in Example 3 is 362°C. Example 3 See Table 5 for the weight percentages of components with different particle sizes in the pellet inner layer material and outer layer material.

[0043] Table 5 Example 3 Pellet inner layer material and the weight percentage of different particle size components in the outer layer material, %

[0044] category

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Abstract

The invention discloses a method for increasing the decrepitation temperature of pellets prepared from iron ore concentrate with the ultrafine particle size. The technical problems that existing pellets prepared from iron ore concentrate with the ultrafine particle size are low in decrepitation temperature and high in preparation cost are mainly solved. The method comprises the steps of raw material preparing, specifically, raw materials are prepared from, by weight, 30%-40% of pellet inner layer materials and 60%-70% of pellet outer layer materials, and the pellet inner layer materials are prepared from, by weight, 30.0%-35.0% of Australian raw ore, 15.0%-20.0% of Australian ore concentrate, 44.0%-54.0% of Meishan ore concentrate and 0.75%-1.25% of bentonite; and pellet preparing, specifically, the pellet inner layer materials are added into a disc-type pelletizing machine to produce pellet inner layers, the pellet outer layer materials are added into the disc-type pelletizing machine, pellet outer layers are formed on the exteriors of the pellet inner layers, and the particle size of the pellets is controlled to range from 9 mm to 15 mm. According to the method, the pellets of alayered structure are prepared, and the decrepitation temperature of the pellets is increased.

Description

technical field [0001] The present invention relates to iron-making raw material pellets, in particular to a method for increasing the bursting temperature of pellets made of ultra-fine-grained iron concentrates, and more specifically, to a method for improving ultra-fine iron pellets by controlling the pelletizing sequence of raw materials. The invention discloses a method for the bursting temperature of concentrate pellets, which belongs to the field of ironmaking raw material pellet production. Background technique [0002] Pellets have the advantages of high iron grade, low content of harmful elements, uniform particle size and high cold strength. With the development of modern blast furnace ironmaking towards the goal of high output, low consumption and long life and the rapid rise of new iron and steel smelting processes, pellets, as a high-quality metallurgical charge, have become one of the main raw materials for blast furnace ironmaking. [0003] Pellet is the prod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/24C22B1/243
Inventor 毕传光龙红明春铁军韩凤光吴雪健
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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