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Sintering method for high-chromic vanadium-titanium ferroferrite

A technology of vanadium-titanium magnetite and sintering method, which is applied in the field of iron and steel metallurgy to achieve the effects of improving mineral composition and structure, improving gas permeability, and improving quality and output

Active Publication Date: 2009-08-19
PANZHIHUA IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] All the technical methods mentioned above are aimed at the sintering of ordinary rich ore powder or ordinary magnetite concentrate powder, and for high chromium type (Cr 2 o 3 1% ~ 2%) vanadium-titanium magnetite concentrate sintering technology development research has not yet been reported

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Sintered red grid high chromium vanadium-titanium magnetite concentrate, sintering basicity is 2.2, the content of quicklime involved in the pre-granulation of the mixture is 3%, and the pre-wetting moisture of the returned ore is 8%, B 2 O 3 The addition amount is 0.5%, and the MgO content in the sinter is 2.8%.

[0019] The results show that compared with the reference period, the melting point of the sinter mixture is reduced by 51°C, the calcium ferrite content in the sinter is increased by 5 percentage points, the drum strength of the sinter is increased by 1.09 percentage points, the yield rate is increased by 1.27 percentage points, and the output is increased by 4.2%. The low-temperature reduction and pulverization rate of sinter decreased by 4.03 percentage points.

Embodiment 2

[0021] Sintered red grid high chromium vanadium-titanium magnetite concentrate, sintering basicity is 2.3, the content of quicklime involved in the pre-granulation of the mixture is 4%, and the pre-wetting moisture of the returned ore is 9.5%, B 2 O 3 The addition amount is 0.7%, and the MgO content in the sinter is 3.2%.

[0022] The results show that compared with the base period, the melting point of the sinter mixture is reduced by 58℃, the calcium ferrite content in the sinter is increased by 8%, the drum strength of the sinter is increased by 1.31%, the yield rate is increased by 2.46%, and the output is increased by 4.63%. The low-temperature reduction pulverization rate of sinter decreased by 4.52%.

Embodiment 3

[0024] Sintered red grid high chromium vanadium-titanium magnetite concentrate, sintering basicity is 2.35, the content of quicklime participating in the pre-granulation of the mixture is 4.5%, and the pre-wetting moisture of the returned ore is 10%, B 2 O 3 The addition amount is 0.8%, and the MgO content in the sinter is 3.5%.

[0025] The results show that compared with the reference period, the melting point of the sinter mixture is reduced by 62℃, the calcium ferrite content in the sinter is increased by 12%, the drum strength of the sinter is increased by 1.45%, the yield is increased by 3.0%, and the output is increased by 4.81%. The low-temperature reduction pulverization rate of sinter decreased by 5.4%.

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Abstract

The invention provides a sintering method of high-chromium vanadium-titanium magnetite concentrate, which can effectively reduce the melting point of high-chromium-type vanadium-titanium magnetite concentrate sintering mixture, improve the mineral composition and structure of sintered ore, thereby improving the sintering rate. mine quality and yield. The method comprises the following steps: 1) pre-granulating the iron concentrate with quicklime; 2) pre-wetting the returned ore with water; 3) preparing the sintered material from the pre-granulated material and the pre-wetted returned ore, and placing the sintered material in the Mix and pelletize in a mixer, and add B2O3 to the mixture; 4) Add MgO to the mixture; 5) Put the mixture into a sintering cup or a sintering machine for sintering. After adopting the method of the invention, the melting point of the sinter mixture is lowered by more than 50°C, the content of calcium ferrite in the sintered ore is increased by more than 5 percentage points, the drum strength of the sintered ore is increased by 1.09-1.56 percentage points, the yield is increased by 1.27-3.18 percentage points, and the output is increased. 4.2% to 5.0%.

Description

Technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and particularly relates to a sintering method of high chromium type vanadium-titanium magnetite. Background technique [0002] Panzhihua high-titanium vanadium-titanium magnetite contains relatively high titanium, has a high melting point, is not easy to sinter, and generates brittle perovskites during the sintering process, so the sintered ore has poor strength and low yield. Hongge Mine is one of the four largest vanadium-titanium magnetite deposits in Panxi area. Not only the content of titanium is equivalent to that of Panzhihua high-titanium vanadium-titanium magnetite, but it also contains higher chromium and chromium grades (Cr 2 O 3 0.55%~0.82%) is 8~10 times of Panzhihua high-titanium vanadium-titanium magnetite, Cr 2 O 3 It is also a high melting point (2400℃) mineral. Its unique composition determines that the difficulty of sintering Hongge high-chromium vanadium-titanium...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/16
Inventor 甘勤何群杜德志王福伦刘龙全杜炽
Owner PANZHIHUA IRON AND STEEL
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