Preparation method for addictive for enhancing burst temperature and quality of pellet and product

A technology of additives and high-temperature equipment is applied in the field of additives used in the preparation of iron-smelting pellets, which can solve problems such as unfavorable high-temperature reduction of pellets, improve high-temperature reduction performance, reduce the drop of pellet grade, and ensure pellets. The effect of taste

Inactive Publication Date: 2014-05-07
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the reduction of pellet grade due to existing binders and additives, SiO 2 The increase in content is not conducive to the high-temperature reduction of pellets. The present invention provides an additive that can be used as a binder and flux for pellets. Using the additive of the present invention can not only significantly increase the bursting temperature of green pellets, but also be suitable for blast furnaces. MgO is required for slagging, and it can reduce the decrease in pellet grade due to the use of additives, especially SiO in pellets 2 content, improve the high-temperature reduction performance of pellets, and improve the quality of pellets

Method used

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  • Preparation method for addictive for enhancing burst temperature and quality of pellet and product
  • Preparation method for addictive for enhancing burst temperature and quality of pellet and product
  • Preparation method for addictive for enhancing burst temperature and quality of pellet and product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Under non-public circumstances, a pellet plant conducted the following implementation verification:

[0022] (1) Pretreatment of MgO-containing minerals.

[0023] Crush the MgO-containing mineral magnesite, and sort the mineral particles with a particle size of 2~5mm; dry at 105°C for 2 hours, and roast the dried MgO-containing mineral at 850±10°C for 1 hour, and the roasted material layer Naturally stacked, the thickness is 30mm; after cooling, it is ground and processed to obtain the additive of the present invention, and its main chemical composition is shown in Table 2.

[0024] The main chemical composition (weight %) of additive in the embodiment of table 2

[0025]

[0026] (2) Detection of particle size, hydration activity, and specific surface area of ​​MgO-containing materials.

[0027] In this implementation process, a laser particle size analyzer (MASTERSIZER 2000) is used to analyze the particle size of the product; the hydration activity of the produc...

Embodiment 2

[0045] An example of the effect of this additive instead of bentonite on the metallurgical properties of pellets.

[0046] The preparation of the additive, the pelletizing process and the performance detection of the bursting temperature of the green pellets are the same as in Example 1;

[0047] For comparison, this additive and bentonite are used as pelletizing additives at the same time, and the proportions of pelletizing materials are:

[0048] ① Iron concentrate: bentonite = 98.0%: 2.0%, which is called test sample 1;

[0049] ② Iron concentrate: additive = 98.5%: 1.5%, which is called the test sample 2;

[0050] ③Iron concentrate: additive = 98.0%: 2.0%, which is called test sample 3;

[0051] Metallurgical properties of green pellets. The obtained green balls are then tested for metallurgical properties such as green ball drop strength, burst temperature, and compressive strength. The results obtained for the metallurgical properties of the green pellets are shown i...

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Abstract

The invention relates to a preparation method for an addictive used for preparing smelted pellets. The preparation method comprises the following technical processes of mineral separation, crushing, drying, and the like. The preparation method is characterized in that the content of mineral raw material MgO is 35%-47%; after the mineral raw material MgO is broken to the granularity less than or equal to 5.0mm, the mineral raw material MgO is roasted at the temperature of 750-900DEG C for 30-120min; and then the obtained product is cooled and grinded to obtain the additive; and the additive comprises the following components in percentage by weight: 77-86% of MgO, 5-10% of SiO2, 1-2% of Al2O3 and 6-15% of fire waste, wherein the hydration reactivity of the additive is more than or equal to 80%, and the specific surface area is more than or equal to 45m2 / g. When the pellet is prepared, the additive accounting for 1-2% of the weight of the raw material is added, so that the raw pellet decrepitation temperature can be obviously improved, and the low temperature reduction degradation ratio and the intermediate temperature reduction can be simultaneously obviously improved so as to obtain the high-quality pellets.

Description

technical field [0001] The invention relates to a preparation method and a product thereof for additives used in preparing ironmaking pellets, especially additives required to increase the bursting temperature of green pellets and improve the quality of pellets. Background technique [0002] When producing iron-making raw material pellets, in order to increase the strength of green pellets, especially the bursting temperature of green pellets, bentonite is usually used as an additive. However, the main component of bentonite is SiO 2 and Al 2 o 3 , for every 1% of bentonite by pellet weight, the pellet grade will drop by about 0.7%. If the amount of bentonite added is large, not only will the SiO in the pellet 2 The content is greatly increased, and fayalite is easy to be produced during the high-temperature reduction process, which is not conducive to the reduction of iron elements in pellets. In addition, when producing flux-type pellets such as MgO pellets and CaO pe...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C22B1/24
Inventor沈峰满高强健姜鑫魏国郑海燕
OwnerNORTHEASTERN UNIV LIAONING