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Method for pellet formation using steel-making slurry

A technology for slurry and pelletizing, which is applied in the field of pelletizing and pelletizing, can solve the problems of occupation of land, waste, pollution of resources, etc., and achieves the improvement of pellet grade, pellet output and green pellet strength. Effect

Inactive Publication Date: 2005-03-16
攀钢集团成都钢铁有限责任公司
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The current practice is that some manufacturers dump the sludge directly, occupying land and causing environmental pollution and waste of resources
In the production of pellets, the technology of recycling steelmaking sludge on site for pellet production and pelletizing has not been reported yet

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The stirred and mixed steelmaking sludge is pumped to the outdoor sludge pool of the pelletizing production line, and then stirred and mixed. During the pelletizing process, the sludge is continuously sprayed by the pump through the pipeline and valve. Add to pelleting pan. During the continuous spraying process, control the concentration of the sludge slurry at 10-40%, and reduce or even stop the use of clean water according to the situation during the spraying process according to the water content of the raw balls. In actual production, after controlling the concentration of sludge slurry to about 20%, the amount of sprayed sludge slurry accounts for about 5% (percentage by weight) of the amount of mixed powder, and the green pellets can be produced by operating the pelletizing disc in a conventional manner. In this example, the proportion of bentonite is only 0.6-0.8%, which is about 40-45% lower than the original; the compressive strength of green pellets increases...

Embodiment 2

[0017] Control the concentration of sludge slurry at 15%, and the amount of sprayed sludge slurry accounts for about 4.5% (percentage by weight) of the amount of mixed powder. In this example, the proportion of bentonite is only 0.7-0.9%, which is about 35-35% lower than the original 40%; the compressive strength of green balls increased by about 3N / ball; the drop strength of green balls increased by about 2 times / ball; no additional water was added during the pelletizing process.

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PUM

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Abstract

The invention relates to a pelletizing method using sludge of steel production and belongs to pelletizing technology in metallurgy field. The method comprises: adjusting sludge concentration to 10-40%, adding 3-10% (weight percentage) sludge in mixture of iron ore powder and bentonite, continuously spraying it in palletizing disk, The advantage of the method : material sphericity is improved greatly. Bentonite usage can reduce greatly in mixture, which promote the pelletizing quality. Pelletizing disk don't take on sandification. Aqueous sludge can minimize the extra water. The enterprise has electric furnace, open-hearth furnace, revolving furnace and pelletizing line can use the method.

Description

technical field [0001] The invention relates to the production technology of producing pellets in the field of metallurgical industry. Background technique [0002] At present, the production of pellets is to mix iron ore powder and bentonite, add water and roll in the pelletizing disc to make green pellets (see the textbook "Iron Oxidation Oxidation" published by "Sintering Pellet Research Institute of Central South University" in February 2001). The basic principle, process and equipment of pelletizing"P.1). The disadvantage of this traditional method is that the amount of bentonite is large and the amount of added water is large. Green balls enter steelmaking after roasting and ironmaking. During the steelmaking process, a large amount of sludge slurry is produced. This steelmaking sludge slurry is the waste generated during the steelmaking process. It has good cohesiveness and contains Certain iron and CaO, high water content, fine particle size of dry ash. How to dea...

Claims

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Application Information

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IPC IPC(8): C22B1/24C22B1/243
Inventor 王万高古兴明彭宗福谢再彬陈少军杨康熊泽明
Owner 攀钢集团成都钢铁有限责任公司
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