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Preparation method for oxidized pellet ore raw materials and oxidized pellet ore

A technology of oxidizing pellets and raw materials, which is applied in the field of iron and steel smelting, can solve the problems of high iron content in iron oxide scale, unusable dust and sludge, and large investment in equipment, so as to achieve the effect of reasonable utilization

Inactive Publication Date: 2017-05-10
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the equipment investment is large, the iron content of the oxide scale is required to be high, and there are some problems such as the dust and mud with low iron content cannot be used.

Method used

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  • Preparation method for oxidized pellet ore raw materials and oxidized pellet ore
  • Preparation method for oxidized pellet ore raw materials and oxidized pellet ore
  • Preparation method for oxidized pellet ore raw materials and oxidized pellet ore

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0032] Correspondingly, the present invention also provides a method for preparing oxidized pellets, which includes the following steps:

[0033] Step a: Provide the above-mentioned oxidized pellet raw materials, and fully mix the raw materials in a strong mixer to obtain a mixture;

[0034] Step b, pelletizing the mixture in a pelletizing tray to obtain green pellets;

[0035] Step c, drying, preheating, roasting, soaking, and then cooling the green balls to finally oxidize the pellets.

[0036] Preferably, in the step c,

[0037] The drying conditions are as follows: the temperature is 150-250°C, and the time is 15-30 min;

[0038] The preheating conditions are as follows: the temperature is 600-900°C, and the time is 8-10 minutes;

[0039] The baking conditions are as follows: the temperature is 1260-1290°C, and the time is 5-10 min;

[0040] The conditions of the soaking are as follows: the temperature is 800-1000°C, and the time is 3-5 min.

[0041] The invention provides an oxidized p...

Embodiment 1～2

[0043] Examples 1-2, comparative examples

[0044] 1. Provide the above-mentioned oxidized pellet raw materials, and fully mix the raw materials in a strong mixer to obtain a mixture; the raw material batching plan of each embodiment is listed in Table 1; the composition of each raw material is listed in Table 2;

[0045] 2. The mixture is pelletized in a pelletizing tray to obtain green balls; the water content and properties of the green balls are listed in Table 3;

[0046] 3. The green balls are dried, preheated, roasted, soaked, and then cooled to finally oxidize the pellets. Please refer to Table 4 for specific process parameters, the chemical composition of the prepared oxidized pellets is listed in Table 5, and the compressive strength is listed in Table 6.

[0047] Table 1 Example raw material preparation scheme

[0048]

[0049] Table 2 Ingredients of raw materials in Examples

[0050]

[0051]

[0052] The first fine iron ore origin: Baotou Steel's Baiyun Obo Mine.

[0053] Th...

Embodiment 3～4

[0063] The firing temperature was 1260°C and 1290°C, and the other steps were the same as in Example 2. The compressive strength of the finished ball was tested, which is listed in Table 7.

[0064] Table 6 Example 2-4 Compressive strength of finished pellets

[0065] Compressive strength Example 2 2364N / P Example 3 2167N / P Example 4 2773N / P

[0066] From the above content, it can be seen that using the oxidized pellet raw materials provided by the present invention and the green pellets prepared by the above process, the drop strength, green pellet compressive strength, and dried pellet compressive strength can meet the technical requirements of pelletizing technology. The finally prepared oxidized pellets can meet the technical requirements of blast furnace production. The addition of iron oxide scale is conducive to the improvement of taste. Moreover, as the roasting temperature increases, the compressive strength of the finished pellets gradually increases.

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Abstract

The invention provides a preparation method for oxidized pellet ore raw materials and oxidized pellet ore. The oxidized pellet ore raw materials comprises first iron concentrate, second iron concentrate and continuous cast and rolled steel oxide scale according to the weight ratio of (0-30): (60-100): (1-5). In the preparation method for the oxidized pellet ore raw materials and the oxidized pellet ore, a certain proportion of oxidized pellet ore prepared from continuous cast and rolled steel oxide scale is matched and added in the oxidized pellet ore raw materials, and in combination with the comprehensive strength of the oxidized pellet ore prepared through a corresponding process, the rotating drum strength and the metallurgical properties, the blast furnace requirements can all be met; and meanwhile reasonable utilization of continuous cast and rolled steel iron-containing dust mud can be achieved, the circular economy is developed, and green steel and iron are made.

Description

Technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to a preparation method of oxidized pellet raw materials and oxidized pellets. Background technique [0002] With the increasing development of iron and steel production, the output of iron oxide scale and other iron and steel scraps has increased year by year. Comprehensive utilization of the iron oxide scale produced in the production process of steel enterprises and turning waste into treasure can not only recycle resources, reduce production costs, but also reduce pollution and maintain ecological balance. Iron oxide scale is the iron-containing oxide produced on the surface of the steel after the rolled pieces are rapidly cooled by water during the rolling process. It accounts for between 3% and 5% of the processed steel. According to the difference of iron oxide scale in the return process of steel plant, the application of iron oxide scale can be divided into sin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/24
CPCC22B1/2406
Inventor 付国伟邬虎林白晓光吕志义张永
Owner INNER MONGOLIA BAOTOU STEEL UNION
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