Method for improving pelletizability of low-pelletizability iron concentrate

A technology of iron concentrate and spheroidizing, which is applied in the field of improving the spheroidizing of refractory nodular iron concentrate, which can solve the problems of unfavorable iron grade, impact, and low strength, etc., to improve pellet quality, simple operation, and increase The effect of green pellet strength

Active Publication Date: 2014-11-26
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for some iron concentrates (parts of magnetite, specularite, flotation hematite, magnetic red mixed ore, etc.), humic acid-type binders are used to replace bentonite, and the green pellet drop strength is still low, lower than 3 times / 0.5m, it is still necessary to add more bentonite or humic acid binder to meet the requirements of pellet strength, and the grade of total iron in pellets is still adversely affected

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] After flattening the dry specularite concentrate, spray CaCl on its surface 2 A modifier solution dissolved in water, wherein the dry weight of the modifier accounts for 45‰ of the dry weight of the iron concentrate, and the iron concentrate is mixed; after the specular iron concentrate sprayed with the modifier solution is placed for 4 hours, Then add 0.8wt% sodium humate therein and carry out the pretreatment of moistening and grinding. The moisture content of the green balls obtained was 7.7wt%, the drop strength of the green balls was 8.8 times / 0.5m, the compressive strength was 22.6N / piece, the bursting temperature of the green balls was 573°C, the compressive strength of the preheated balls was 476N / piece, and the roasting The compressive strength of the ball is 2692N / piece, and the TFe grade of the finished ball is 67.42%.

Embodiment 2

[0028] After flattening the dry material of specularite concentrate, spray AlCl on its surface 3 , FeCl 3 , CaCl 2 and MgCl 2 A modifier solution that is mixed and dissolved in water, wherein the dry weight of the modifier accounts for 30‰ of the dry basis of the iron concentrate, and the iron concentrate is mixed; the specular iron concentrate sprayed with the modifier solution is placed for 14 hours , and then add 0.6wt% sodium humate therein and carry out the pretreatment of moistening and grinding. The moisture content of the green balls obtained was 7.3wt%, the drop strength of the green balls was 6.9 times / 0.5m, the compressive strength was 20.4N / piece, the bursting temperature of the green balls was 584°C, the compressive strength of the preheated balls was 483N / piece, and the roasting The compressive strength of the ball is 2721N / piece, and the TFe grade of the finished ball is 67.66%.

Embodiment 3

[0030] After flattening the dry material of flotation hematite concentrate, spray Al on its surface 2 (SO 4 ) 3 , Fe 2 (SO 4 ) 3 , MgSO 4 A modifier solution formed by mixing and dissolving in water, wherein the dry weight of the modifier accounts for 40‰ of the dry weight of the iron concentrate, and the iron concentrate is mixed; the iron concentrate sprayed with the modifier solution is placed for 24 hours, Then add 0.5wt% sodium humate therein and carry out the pretreatment of moistening and grinding. The moisture content of the obtained green balls was 7.8wt%, the drop strength of the green balls was 6.8 times / 0.5m, the compressive strength was 13.4N / piece, the bursting temperature of the green balls was 603°C, the compressive strength of the preheated balls was 468N / piece, and the roasting The compressive strength of the ball is 2612N / piece, and the TFe grade of the finished ball is 66.16%.

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Abstract

The invention discloses a method for improving pelletizability of low-pelletizability iron concentrate, which comprises the following steps: adding a small amount of soluble metal salt modifier into the iron concentrate, evenly mixing, adding a small amount of sodium humate into the iron concentrate, carrying out wet grinding pretreatment, and pelletizing. The method is simple to operate and low in facility requests, can effectively enhance the drop strength and compression strength of the iron concentrate crude pellets, enables the other properties to reach the standard, and enhances the iron grade of the finished pellets. The method is especially suitable for pelletizing the low-pelletizability iron concentrate, and can obviously improve the pellet quality of the low-pelletizability iron concentrate.

Description

technical field [0001] The invention relates to a method for improving the spheroidizing property of refractory nodular iron concentrate, which belongs to the technical field of iron concentrate spheroidizing. Background technique [0002] Because of its good mechanical properties and high-temperature metallurgical properties, acid oxidized pellets can significantly improve the air permeability of the blast furnace charge column, and are considered to be high-quality raw materials necessary for the realization of the "concentrated charge" policy of the blast furnace and the optimization of the charge structure. Therefore, in recent years, major domestic iron and steel enterprises are vigorously developing the production of iron ore oxide pellets. For blast furnace ironmaking, the grade of TFe in the furnace charge is increased by 1%, the coke ratio is reduced by 2%, and the output can be increased by 3%. However, at present, most of the domestic pelletizing plants use inorg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/244
Inventor 张元波李光辉姜涛周友连范晓慧黄柱成郭宇峰杨永斌李骞陈许玲彭志伟甘敏徐斌苏子键孙阳游志雄刘兵兵刘臣陈军
Owner CENT SOUTH UNIV
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