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A method for reducing the roasting temperature of mgo pellets

A pelletizing and roasting technology is applied in the field of reducing the roasting temperature of MgO pellets, which can solve the problems of poor pellet strength, easy ring formation and high preheating roasting temperature, and achieve the effect of solving the high roasting temperature

Active Publication Date: 2017-04-05
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, relevant production practice shows that the control of thermal parameters of MgO pellets is more difficult than that of ordinary acid pellets, mainly manifested in high preheating and roasting temperature and poor pellet strength, so there is a certain degree of difficulty in production
When using the grate machine-rotary kiln process to produce MgO pellets, the rotary kiln is prone to ring formation during long-term high-temperature roasting, and the production operation is difficult

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] In this embodiment, 5 parts of finely ground Australian limonite powder are added to produce MgO pellets.

[0055] (1) Fine grinding of Australian limonite powder:

[0056] After the Australian limonite powder is finely ground, the proportion of which is less than 200 mesh (0.074mm) is 76.5%;

[0057] (2) Ingredients:

[0058] Australian limonite powder, iron ore powder, slaked lime, light-burned magnesite powder and bentonite are compounded according to the following weight percentages, and the specific ratio is:

[0059] Australian limonite powder 5 parts,

[0060] Iron ore powder 89.5 parts,

[0061] 2 parts slaked lime

[0062] Lightly burned magnesite powder 2 parts,

[0063] 1.5 parts of bentonite,

[0064] The main chemical composition and weight percentage of Australian limonite powder are:

[0065] TFe 57%; FeO 0.6%; SiO 2 5.7%;

[0066] CaO 0.08%; MgO 0.08%; Burnout rate: 10.5%;

[0067] (3) Mixing and pelletizing:

[0068] The above-mentioned comp...

Embodiment 2

[0077] In this embodiment, 10 parts of finely ground Australian limonite powder are added to produce MgO pellets.

[0078] (1) Fine grinding of Australian limonite powder:

[0079] After the Australian limonite powder is finely ground, the proportion of which is less than 200 mesh (0.074mm) is 76.5%;

[0080] (2) Ingredients:

[0081] Australian limonite powder, iron ore powder, slaked lime and bentonite are proportioned according to the following weight percentages, and the specific proportioning is:

[0082] Australian limonite powder 10 parts,

[0083] Iron ore powder 84.5 parts,

[0084] 2 parts slaked lime

[0085] Lightly burned magnesite powder 2 parts,

[0086] 1.5 parts of bentonite,

[0087] Wherein, the main chemical composition and weight percentage of Australian limonite powder are the same as those in Example 1.

[0088] (3) Mixing and pelletizing:

[0089] The above-mentioned components are mixed by a powerful mixer, and then added to a disc pelletizer to ...

Embodiment 3

[0098] In this embodiment, 8 parts of finely ground Australian limonite powder are added to produce MgO pellets, but the Australian limonite powder is further finely ground, and the ratio of the finely ground Australian limonite powder is 85.3%.

[0099] (1) Fine grinding of Australian limonite powder:

[0100] After the Australian limonite powder is finely ground, its ratio of less than 200 mesh (0.074mm) is 85.3%;

[0101] (2) Ingredients:

[0102] Australian limonite powder, iron ore powder, slaked lime and bentonite are proportioned according to the following weight percentages, and the specific proportioning is:

[0103] Australian limonite powder 8 parts,

[0104] Iron ore powder 86.5 parts,

[0105] 2 parts slaked lime

[0106] Lightly burned magnesite powder 2 parts,

[0107] 1.5 parts of bentonite,

[0108] Wherein, the main chemical composition and weight percentage of Australian limonite powder are the same as those in Example 1.

[0109] (3) Mixing and pelle...

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Abstract

The invention discloses a method for lowering the calcination temperature of MgO pellets. The method comprises the technologies of burdening, mixing, pelletizing and calcination. The method is characterized in that fine-ground Australian limonite powder is added to iron ore powder. According to the method for lowering the calcination temperature of the MgO pellets, the technical problems of the high calcination temperature and the low strength of calcination pellets in the production of the MgO pellets are solved to some extent by adding the fine-ground Australian limonite powder to the iron ore powder.

Description

technical field [0001] The invention relates to a method for reducing the roasting temperature of MgO pellets. Background technique [0002] Previous studies have shown that adding a certain amount of MgO flux to pellets can significantly improve the metallurgical properties of ordinary acidic pellets, [0003] Since the metallurgical properties of pellets were improved after adding MgO flux, MgO pellets were produced for blast furnace smelting in foreign countries in the 1970s. However, relevant production practice shows that the control of thermal parameters of MgO pellets is more difficult than that of ordinary acid pellets, mainly manifested in high preheating and roasting temperature and poor pellet strength, so the production has certain difficulties. When using the grate-rotary kiln process to produce MgO pellets, the rotary kiln is prone to ring formation during long-term high-temperature roasting, and the production operation is difficult. Contents of the inventi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/24C22B1/16
Inventor 范建军赵建伟蔡湄夏贺淑珍张华李昊堃
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD