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Production method of oxide pellets

A technology of oxidizing pellets and production methods, which is applied in the field of metallurgical pellet production, can solve the problems of poor pellet strength, uneven distribution of blast furnace airflow, and damaged coke compressive strength and wear resistance, and achieve low roasting temperature , good metallurgical performance, and the effect of reducing energy consumption

Inactive Publication Date: 2017-02-01
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high content of alkali metals in iron concentrates has brought a series of problems to pellet production and blast furnace smelting: on the one hand, the use of high-alkali metal iron concentrates in pellet production is likely to cause lattice changes in the reduction process of finished pellets. transformation, resulting in an increase in the reduction expansion rate of the pellets and a deterioration of the metallurgical properties; on the other hand, the high-alkali metal iron concentrate enters the blast furnace with the pellets, and the pellets are pulverized prematurely in the upper part of the blast furnace, thereby deteriorating the air permeability of the blast furnace , the alkali load of the blast furnace increases, destroying the compressive strength and wear resistance of coke, and the blast furnace is easy to nodulate, resulting in uneven distribution of blast furnace air flow, thus affecting the improvement of various economic and technical indicators of the blast furnace
The disadvantage is that the obtained pellets have poor strength and are only suitable for non-blast furnace ironmaking

Method used

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  • Production method of oxide pellets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] 1. Use high-alkali metal iron concentrate A1 accounting for 35% of the mass of the mixed concentrate, and low-alkali metal iron concentrate B1 accounting for 65% of the mass of the mixed concentrate; specifically:

[0049] High alkali metal iron concentrate A1 is randomly selected from high alkali metal iron concentrate A. The main chemical components include: measured TFe: 65.76%, FeO: 29.1%, CaO: 1.2%, SiO 2 : 1.8%, MgO: 0.91%, Na 2 O+K 2 O: 0.243%, F: 0.34%;

[0050] Low-alkali metal iron concentrate B1 is randomly selected from low-alkali metal iron concentrate B. The main chemical components include: measured TFe: 65.44%, FeO: 27.18%, CaO: 0.65%, SiO 2 : 7.48%, MgO: 0.41%, Na 2 O+K 2 O: 0.12%, F: 0.06%;

[0051] High-alkali metal iron concentrate A1 is processed by high-pressure roller milling to make its specific surface area reach 1500m 2 More than / g, the two kinds of iron concentrates are mixed to obtain a mixed concentrate, and 2.0% of bentonite is added...

Embodiment 2

[0053] Embodiment 2 (comparative test one of embodiment 1)

[0054] Method steps such as figure 1 shown. As a comparison with Example 1, the same high-alkali metal iron concentrate A1 and low-alkali metal iron concentrate B1 as in Example 1 were mixed to obtain a mixed concentrate for trial production, wherein the high-alkali metal iron concentrate A1 accounts for 40% of the mass of the mixed concentrate, and low-alkali metal iron concentrate B1 accounts for 60% of the mass of the mixed concentrate to obtain the mixed concentrate, adding 2.0% of bentonite and 2.0% of the first magnesia additive to obtain the mixed material, Bentonite and the first magnesia additive are the same as in Example 1, and then, the pelletizer is used to add water to make pellets; the first magnesia additive includes CaO: 3-5%, SiO 2 : 30-36%, MgO: 30-38%.

[0055] The resulting green ball drop strength is 6.6 times (0.5) -1 , preheating temperature 600, preheating time 9min, calcination temperatu...

Embodiment 3

[0057] Embodiment 3 (comparative test two of embodiment 1)

[0058] As a comparison with Example 1, the high-alkali metal iron concentrate A1, which accounts for 40% of the mixed concentrate mass and is taken at the same time as in Example 1, is used. The measured TFe: 65.76%, FeO: 29.1%, CaO : 1.2%, SiO 2 : 1.8%, MgO: 0.91%, Na 2 O+K 2 O: 0.243%, F: 0.34%; Low-alkali metal iron concentrate B1, which accounts for 65% of the mass of the mixed concentrate, is used. Low-alkali metal iron concentrate B1 is randomly selected from low-alkali metal iron concentrate B. The main chemical composition According to the mass percentage, it includes: measured TFe: 65.44%, FeO: 27.18%, CaO: 0.65%, SiO 2 : 7.48%, MgO: 0.41%, Na 2 O+K 2 O: 0.12%, F: 0.06%; high-alkali metal iron concentrate A1 is treated by high-pressure roller milling to make its specific surface area reach 1500m 2 / g or more, two kinds of iron concentrates are mixed to obtain a mixed concentrate, and 2% bentonite and 1...

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Abstract

The invention discloses a production method of oxide pellets. The production method comprises the following steps that firstly, high alkali metal iron ore concentrate pretreatment is conducted, specifically, high alkali metal iron ore concentrate is subjected to high pressure roller grinding pretreatment; secondly, a mixture is prepared, specifically, a high alkali metal iron ore concentrate pretreated material obtained in the first step and a low alkali metal iron ore concentrate are mixed into mixed concentrate, then bentonite and a magnesium addition agent are added into the mixed concentrate, and a mixture is obtained; and thirdly, the oxide pellets are prepared, specifically, the mixture obtained in the step two is subjected to water adding pelletizing through a pelletizing device, and green pellets are subjected to drying, preheating and roasting to obtain the finished oxide pellets. The oxide pellets produced through the provided method is low in expansion rate, good in metallurgical performance, and the finished pellet performance can meet the requirement of production of blast furnace with the particle size being 3000 or more.

Description

technical field [0001] The invention relates to the field of metallurgical pellet production, in particular to a production method of oxidized pellets. Background technique [0002] In recent years, in order to implement the "concentrated material" policy of blast furnace ironmaking, the proportion of acidic oxidized pellets in most domestic blast furnace iron materials has been increasing year by year. Low-impurity magnetite concentrate (also known as low-alkali metal Iron concentrate) is a recognized high-quality raw material for the production of oxidized pellets, but with the increase in demand for blast furnace acid pellets, the supply of low-impurity high-quality iron concentrate resources for pellet production is becoming increasingly tight. Utilize the Ka 2 O, Na 2 It is imperative to produce oxidized pellets from iron concentrates (high alkali metal iron concentrates) with high levels of harmful elements such as O. However, the high content of alkali metals in ir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B1/24
CPCC22B1/02C22B1/2406
Inventor 刘周利邬虎林李玉柱白晓光吕志义
Owner INNER MONGOLIA BAOTOU STEEL UNION
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