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
  • Claims
  • 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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0014] Example 1:

[0015] The steel-making sludge after stirring and mixing is pumped to the outdoor sludge pool of pelletizing production line, and then stirred and mixed. During pelletizing, the sludge is continuously sprayed with the pump through pipes and valves. Add it to the ball making plate. In the continuous spraying process, control the concentration of sludge slurry at 10-40%. During the spraying process, depending on the situation, reduce or even stop using clean water according to the water content of the green ball. In actual production, after controlling the concentration of sludge slurry at about 20%, the amount of sludge spraying accounts for about 5% (weight percentage) of the mixed powder amount, and running the pelletizing plate in a conventional manner can produce green pellets. In this example, the blending ratio of bentonite is only 0.6-0.8%, which is about 40-45% lower than the original; the compressive strength of the green balls increases by about 4N / bal...

Example Embodiment

[0016] Example 2:

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

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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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