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A method for improving the mineral phase structure of sintered ore

A technology of sinter and mineral phase, which can be applied to improve the mineral phase structure of sinter and the field of sintering, and can solve the problems of reducing the strength and quality of sinter.

Active Publication Date: 2021-09-24
德龙钢铁有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, dicalcium silicate is also a common binder phase in sintered ore. Dicalcium silicate includes 4 variants, namely α, α', β, and γ types, but the β, γ types usually appear in sintered ore. Dicalcium silicate, during the cooling process of high-temperature sinter, β-type dicalcium silicate will transform into γ-type dicalcium silicate, and the volume will expand, resulting in automatic pulverization of sintered ore, reducing the strength and quality of sintered ore

Method used

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  • A method for improving the mineral phase structure of sintered ore
  • A method for improving the mineral phase structure of sintered ore
  • A method for improving the mineral phase structure of sintered ore

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Embodiment 1: prepare additive according to following mass parts: H 3 BO 3 15 parts, CaCl 2 72 parts, NaCl 10 parts, KMnO 4 2 parts; take 0.02kg of additives and dissolve them in 2kg of water to make an additive solution; sintering cup test: use a 50kg sintering cup and 40kg of sintering mixture, add the prepared additive solution and mix well during the first mixing, and use a roller for the second mixing ball For the pelletizing machine, the pelletizing time is 8 minutes, and the moisture content of the sintering mixture is controlled at about 7.5%. In order to prevent the liquid phase generated during the sintering process from adhering to the grate bars, 1 kg of sintered ore with a particle size of 10-16 mm is placed on the grate bars of the sintering cup as the bottom material, and the amount of sintering mixture is controlled at about 40 kg. Layer thickness control is 650mm. Liquefied petroleum gas is used for sintering ignition, the sintering ignition tempe...

Embodiment 2

[0023] Embodiment 2: prepare additive according to following mass parts: H 3 BO 3 10 parts, CaCl 2 85 parts, NaCl 5 parts, KMnO 4 3 parts; Dissolve 0.02kg of additives in 2kg of water to make an additive solution; sintering cup test: use a 50kg sintering cup and 40kg of sintering mixture, add the prepared additive solution and mix well during the first mixing, and use a roller for the second mixing ball For the pelletizing machine, the pelletizing time is 8 minutes, and the moisture content of the sintering mixture is controlled at about 7.5%. In order to prevent the liquid phase generated during the sintering process from adhering to the grate bars, 1 kg of sintered ore with a particle size of 10-16 mm is placed on the grate bars of the sintering cup as the bottom material, and the amount of sintering mixture is controlled at about 40 kg. Layer thickness control is 650mm. Liquefied petroleum gas is used for sintering ignition, the sintering ignition temperature is contr...

Embodiment 3

[0024] Embodiment 3: prepare additive according to following mass parts: H 3 BO 3 20 parts, CaCl 2 67 parts, NaCl 7 parts, KMnO 4 1 part; Dissolve 0.02kg of additives in 2kg of water to make an additive solution; sintering cup test: use a 50kg sintering cup, sintering mixture 40kg, add the prepared additive solution and mix well during the first mixing, and use a roller for the second mixing ball For the pelletizing machine, the pelletizing time is 8 minutes, and the moisture content of the sintering mixture is controlled at about 7.5%. In order to prevent the liquid phase generated during the sintering process from adhering to the grate bars, 1 kg of sintered ore with a particle size of 10-16 mm is placed on the grate bars of the sintering cup as the bottom material, and the amount of sintering mixture is controlled at about 40 kg. Layer thickness control is 650mm. Liquefied petroleum gas is used for sintering ignition, the sintering ignition temperature is controlled a...

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Abstract

A method for improving the mineral phase structure of sintered ore, adding an additive to the sintering mixture, and the additive is composed of the following parts by mass: H 3 BO 3 10‑20, CaCl 2 67‑85, NaCl 5‑10, KMnO 4 1‑3. The present invention designs an additive through in-depth research and repeated tests aimed at improving the quality of sintered ore. Adding the aqueous solution of the additive to the sintering mixture can promote the bonding of Fe3O4 with calcium ferrite and dicalcium silicate to form an interwoven erosion structure during the sintering process, reducing the sintered ore porphyritic structure and increasing the stability of the sintered ore phase. , reduce the formation of dicalcium silicate, and obviously promote the formation of acicular calcium ferrite, increase the uniformity of the sintered ore phase, effectively improve the sintered ore microstructure, and improve the quality of the sintered ore.

Description

technical field [0001] The invention relates to a sintering technology, in particular to a method capable of improving the mineral phase structure of sintered ore, belonging to the technical field of iron and steel smelting. Background technique [0002] Sinter is the main raw material for blast furnaces. With the continuous progress and development of the steel industry, the quality requirements for sinter are getting higher and higher. The mineral phase composition and microstructure of sinter determine the quality of sinter. At present, the ore phase composition of high alkalinity sinter includes: metal phases such as hematite, magnetite, calcareous fusterite, and binder phases such as calcium ferrite, silicate, and glass. Among them, calcium ferrite is an important binder phase for high alkalinity sintering. Calcium ferrite has good reducibility and compressive strength. The quantity and structure of calcium ferrite in sinter play a decisive role in the strength and met...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/24C22B1/16
CPCC22B1/16C22B1/2406
Inventor 赵文书马建军郄亚娜王延江王建芳孙艳琴李英涛张淑会李晓海王晓光刘小杰李福民朱红芳牛跃威徐子谦吕万峰范常宏魏秀芳
Owner 德龙钢铁有限公司
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