Method for preparing pellets from K2O, Na2O and F containing iron ore concentrate and high magnesium composite binder

A binder preparation and binder technology, applied in the field of agglomeration of ironmaking raw materials, can solve the problems of lower grade of finished pellets, poor cohesiveness, and restrictions on the production of magnesia pellets

Active Publication Date: 2020-09-11
BAOTOU IRON & STEEL GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Generally, the magnesia additives used in pellet production include lightly burned dolomite powder, serpentine powder, and magnesite powder. Although these magnesia powders have very fine particle size and high dispersion, their cohesiveness is poor. Therefore, in the production of magnesia pellets, a certain proportion of bentonite and a certain proportion of magnesia additives need to be added, but with the increase of the amount of magnesia additives added, the grade of finished pellets will decrease significantly, which restricts the production of magnesia pellets. Production of Magnesia Pellets

Method used

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  • Method for preparing pellets from K2O, Na2O and F containing iron ore concentrate and high magnesium composite binder
  • Method for preparing pellets from K2O, Na2O and F containing iron ore concentrate and high magnesium composite binder
  • Method for preparing pellets from K2O, Na2O and F containing iron ore concentrate and high magnesium composite binder

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example

[0029] Each example application contains K 2 O, Na 2 See Tables 1-4 for the raw material composition, ore blending scheme, pellet chemical composition and related properties of O and F concentrates mixed with high-magnesium binder to prepare pellets.

[0030] Table 1: Chemical Composition of Raw Materials, %

[0031]

[0032] Note: The QNP-8 binder (non-high-magnesium composite binder) in Table 1 was purchased from Baotou Gangxing Industrial (Group) Xinxing Metallurgical Raw Materials Co., Ltd.

[0033] Table 2: Test plan for adding high magnesium binder

[0034]

[0035] Table 3: The effect of adding different types of high-magnesium binders on the performance of green balls

[0036] Test No. Moisture, % Drop strength, times / P Green pellet compressive strength, N / P benchmark 6.90 5.85 15.96 Example 1 6.85 8.55 15.71 Example 2 6.90 5.70 15.20 Example 3 7.05 6.10 15.27 Example 4 7.10 6.05 15.86

[0037] Table...

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Abstract

The invention discloses a method for preparing pellets from K2O, Na2O and F containing iron ore concentrate and a high magnesium composite binder. According to the method, under the condition of higher MgO content, the magnesium pellets prepared from the high-magnesium composite binder in cooperation with the iron concentrate has the advantages that metallurgical properties such as reduction swelling performance, softening dropping performance, high-temperature reducibility and the like can meet the requirements of blast furnace production, the defects of low pellet grade and low quality of blast furnace production of current general magnesium additives can be overcome, and bentonite needs not to be mixed.

Description

technical field [0001] The invention belongs to the iron-making raw material agglomeration technology, and specifically relates to a K-containing 2 O, Na 2 A method for preparing pellets by mixing O and F concentrates with a high-magnesium composite binder. Background technique [0002] Generally, the magnesia additives used in pellet production include lightly burned dolomite powder, serpentine powder, and magnesite powder. Although these magnesia powders have very fine particle size and high dispersion, their cohesiveness is poor. Therefore, in the production of magnesia pellets, a certain proportion of bentonite and a certain proportion of magnesia additives need to be added, but with the increase of the amount of magnesia additives added, the grade of finished pellets will decrease significantly, which restricts the production of magnesia pellets. Production of magnesia pellets. Contents of the invention [0003] For one or more of the problems in the prior art, the...

Claims

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Application Information

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IPC IPC(8): C22B1/243C22B1/244C22B1/02
CPCC22B1/2406C22B1/243C22B1/244C22B1/02
Inventor 白晓光付国伟赵彬吕志义张永
Owner BAOTOU IRON & STEEL GRP
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