Production method of cold-solidified rusted pellet

A technology of rusted pellets and a production method, which is applied in the production field of cold-solidified rusted pellets, can solve the problems of long production cycle and low production efficiency, and achieves the effect of saving water resources and having a good development prospect.

Active Publication Date: 2015-03-25
XICHANG CITY HECHENG IND & TRADE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The object of the present invention is: to provide a kind of production method of cold-consolidated rusted pellets, the production efficiency of pellets is high, The production cycle is further shortened, and large-scale production can be realized

Method used

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  • Production method of cold-solidified rusted pellet
  • Production method of cold-solidified rusted pellet
  • Production method of cold-solidified rusted pellet

Examples

Experimental program
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Effect test

Embodiment 1

[0053] A production method of cold-consolidated rusted pellets, comprising the following steps:

[0054] a. Pellet production, the raw materials for making pellets include 40wt% iron powder for iron slag magnetic separation, 59wt% hematite powder 1 and 1wt% magnesium chloride, and the content of CaO in the iron powder for iron slag magnetic separation is 4.52wt% , adopt this raw material and compounding ratio, TFe=54.89%, MFe=23.20% in the mixture. After all the mixing, drying, and ball milling to 120 mesh, the fine powder of the mixture will form a pre-wet material with a water content of 7% in the twin-shaft mixer composed of a spiral metering scale and an atomized water microcomputer control system, and enter the circle Ф10-25mm raw pellets are formed in the pelletizing machine. The moisture content of the green pellets is 9.6%. The acidity and alkalinity in the green pellets is PH=9.4.

[0055] b. Pre-curing of pellets. Send the raw pellets produced by the above process...

Embodiment 2

[0067] A production method of cold-consolidated rusted pellets, comprising the following steps:

[0068] a. Pellet production, the raw materials for making pellets include 50wt% iron powder for iron slag magnetic separation, 49.5wt% hematite powder 2 and 0.5wt% magnesium chloride, and the content of CaO in the iron powder for iron slag magnetic separation is 5wt %, adopt this raw material and compounding ratio, TFe=56.07%, MFe=20.25% in the mixture. After the iron powder of iron slag magnetic separation is ball milled to 140 mesh, it is mixed with other raw materials, moistened and mixed by a wheel mill, and then enters a double roller briquetting machine to form a green pellet of 40mmx30mmx20mm (length x width x height). The moisture content of the green pellets is 10.5%. The acidity and alkalinity in the green pellets is PH=8.2.

[0069] b. Pre-curing of pellets. Send the green pellets produced by the above process into the mesh belt curing machine. The thickness of the pe...

Embodiment 3

[0081] A production method of cold-consolidated rusted pellets, comprising the following steps:

[0082] A. pellet production, the raw material of making pellet comprises the magnesium chloride of 60wt% steel slag magnetic separation iron powder, 39.3wt% hematite powder 1 and 0.7wt%, and the content of CaO is 6wt% in the steel slag magnetic separation iron powder, Using this raw material and compounding ratio, TFe=58.58% and MFe=26.00% in the mixture. Steel slag magnetically separated iron powder is ball milled to 160 mesh, mixed with other raw materials, moistened and mixed by wheel mill, and then enters the double roller briquetting machine to form green pellets of 40mmx30mmx20mm (length x width x height). The moisture content of the green pellets is 10.8%. The acidity and alkalinity in the green pellets is PH=9.8.

[0083] b. Pre-curing of pellets. Send the raw pellets produced by the above process into the grate machine. The thickness of the pellet material layer is 100m...

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Abstract

The invention discloses a production method of a cold-solidified rusted pellet. The production method comprises the following steps: step a, manufacturing a pellet; step b, pre-maintaining the pellet, namely sending the manufactured raw pellet to a belt maintainer in a condition that the thickness of a pellet material layer is 100mm to 300mm, supplying hot air or hot smoke to the belt maintainer, ensuring that the temperature of the pellet material layer is 30 to 50 DEG C, maintaining for 8-24 hours, controlling the flow rate of the hot air or the hot smoke, and ensuring that the water content of the maintained pellet is 5wt% to 7wt% and the strength of each pellet is larger than or equal to 150N; step c, performing steam maintenance; step d, supplying water and supplying air for maintenance; step e, after 4 to 5 days of pellet pre-maintenance, steam maintenance and water-supplied and air-supplied maintenance, screening to obtain the cold-solidified rusted pellet. The cold-solidified rusted pellet produced by the method disclosed by the invention is remarkably improved in compression strength after the raw pellet is pre-maintained and is convenient for subsequent large-scale production.

Description

technical field [0001] The invention belongs to the technical field of metallurgical raw material preparation, and in particular relates to a production method of cold-solidified rusted pellets. Background technique [0002] For a long time, people have been exploring and researching powder agglomeration methods other than sintering and oxidation roasting, especially looking for an iron-making charge that does not need to be consolidated by high-temperature operations. It is against this background that cold-set pellets appear. and developed. [0003] The advantages of cold solidification pellet production are simple process equipment, less energy consumption, low cost and no pollution. The development of cold-set pellet technology makes it possible for iron and steel enterprises to completely recycle all kinds of metallurgical dust and realize the economic growth model of circular factories. However, there is a big deficiency in the production of this kind of pellets at p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/248
Inventor 朱勇邓波姚明贵凌征周建军彭聪王彬殷国民
Owner XICHANG CITY HECHENG IND & TRADE
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