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Method for preparing oxidized pellets by utilizing iron-containing royalex sea sand concentrates as raw materials

An Indonesian sea sand, oxidizing technology, applied in the field of preparing oxidized pellets, to achieve the effect of easy acquisition, wide source and low cost

Inactive Publication Date: 2014-07-16
SICHUAN CHUANWEI GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is currently no economical and efficient method for producing high-quality oxidized pellets

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1. The particle size of the sea sand concentrate is controlled to be less than 0.074mm, the mass percentage is greater than 40%, the proportion of bentonite is 2.5%, and the moisture content of the green ball is controlled at 7.5%. The prepared green balls have a drop strength of 4.1N / piece, a preheating temperature of 800°C, a preheating time of 10min, a calcination temperature of 1250°C, and a calcination time of 20min. The compressive strength of the final finished pellets is 2526N / piece, and the reduction expansion index is 18.8%.

Embodiment 2

[0026] Example 2. Control the particle size of the sea sand concentrate to be less than 0.074mm, the mass percentage is greater than 50%, the proportion of bentonite is 2.2%, the moisture content of the green balls is controlled at 7.4%, and the prepared green balls have a drop strength of 4.3N / piece. The temperature is 850°C, the preheating time is 15min, the firing temperature is 1220°C, and the firing time is 14min. The compressive strength of the final finished pellets is 2630N / piece, and the reduction expansion index is 17.2%.

Embodiment 3

[0027] Example 3. Control the particle size of the sea sand concentrate to be less than 0.074mm, the mass percentage is greater than 60%, the proportion of bentonite is 2.2%, the moisture content of the green balls is controlled at 7.3%, and the drop strength of the prepared green balls is 4.5N / piece. The temperature is 850°C, the preheating time is 12min, the firing temperature is 1240°C, and the firing time is 17min. The compressive strength of the final finished pellets is 2580N / piece, and the reduction expansion index is 14.5%.

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PUM

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Abstract

The invention relates to the field of oxidized pellets, in particular to a method for preparing oxidized pellets by utilizing iron-containing royalex sea sand concentrates as raw materials. The invention aims at providing an oxidized pellet preparation method capable of economically and efficiently producing high-quality oxidized pellets. The method for preparing the oxidized pellets by utilizing the iron-containing royalex sea sand concentrates as the raw materials comprises the following steps: a, selecting the sea sand concentrates, performing magnetic separation for mineral separation, mixing the sea sand concentrates with a bentonite ingredient, and adding water; b, pelletizing and roasting a mixture of the sea sand concentrates and the bentonite ingredient; c, obtaining the oxidized pellets. The compressive strength of a finished pellet is greater than or equal to 2500N per piece, and the reduction expansion index of the finished pellet is less than 20%. Since the iron-containing royalex sea sand concentrates are extensive in source, rich in inventory, easily available, and low in cost, the obtained pellets are high in strength and good in metallurgy property. The method is especially applicable to preparing high-quality oxidized pellets by use of the iron-containing royalex sea sand concentrates.

Description

technical field [0001] The invention relates to the field of oxidizing pellets in iron and steel metallurgy, in particular to a method for preparing oxidizing pellets by using iron-containing Indonesian sea sand concentrate as a raw material. Background technique [0002] Oxidizing pellets are an important part of the blast furnace charge structure, and their performance directly affects blast furnace smelting and even the entire steel production. Although my country's pellet production has made great progress, there are still many problems, which are mainly reflected in the following aspects: (1) low grade; (2) SiO 2 (3) poor compressive strength; (4) problems such as high ratio of bentonite. Tracing it to its cause mainly lies in: my country's iron ore grade is low, and impurity content is high, causes concentrate property to be complicated, and ball forming performance is poor. Therefore, while the pellet production is developing towards large-scale and automatic, high-...

Claims

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Application Information

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IPC IPC(8): C22B1/243
Inventor 万新翁庆强柳浩刘中林黄斌何龙奎王猛成
Owner SICHUAN CHUANWEI GRP CO LTD