Method for improving metallurgical performance of sintered ore

A technology for sintering and performance, applied in the field of sintering, can solve the problems of uneven adhesion of halide solution, affecting the performance of sintered ore reduction and pulverization at low temperature, etc. sex, the effect of increasing the oxygen content

Active Publication Date: 2018-11-06
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sintered ore after spraying is directly sent to the blast furnace for ironmaking, which causes extremely uneven adhesion of the halide solution on the sintered ore, which affects the low-temperature reduction pulverization performance of the subsequent sintered ore
[0007] In order to improve the metallurgical properties of sintered ore, solve the disadvantages of traditional oxygen-enriched sintering and the current method of spraying calcium chloride to sintered ore, and improve the metallurgical properties of sintered ore, the present invention proposes a method for improving the metallurgical properties of sintered ore

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The sintering raw materials and fuels are mixed and granulated for the second time to form a sintering mixture, and 6.5% of the total mass of the sintering mixture is added to obtain the sintering mixture A during the first mixing and second mixing and granulation. 60% of the calcium chlorate is added during one mixing, and the remaining 40% of calcium chlorate is added during the second mixing and granulation. The calcium chlorate is added as a saturated solution.

[0036] In the particle size composition of sintering mixture A, 3mm≤particle size≤5mm accounted for 37% of the total mass percentage; 5mm

[0037] The sintering raw materials and fuels are mixed and granulated for the second time to form a sintered mixture, and 5.5% of the total mass of the sintered mixture is added to obtain the sintered mixtur...

Embodiment 2

[0044] The sintering raw materials and fuels are mixed and granulated for the second time to form a sintering mixture, and 7% of the total mass of the sintering mixture is added with calcium chlorate to obtain the sintering mixture A during the first mixing and second mixing and granulation. 65% of the calcium chlorate is added during one-time mixing, and the remaining 35% of calcium chlorate is added during the second-mix granulation. The calcium chlorate is added as a saturated solution.

[0045] In the particle size composition of sintering mixture A, 3mm≤particle size≤5mm accounted for 40% of the total mass percentage; 5mm

[0046] The sintering raw materials and fuels are mixed and granulated for the second time to form a sintering mixture. During the first mixing and second-mixing and granulation, calcium chl...

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Abstract

The invention relates to a method for improving metallurgical performance of sintered ore. The method comprises the following steps: performing first-time uniform mixing and second-time mixing pelleting on sintering raw materials and fuel to form a sintering mixed material, wherein calcium chlorate is added in the sintering mixed material during first-time uniform mixing and second-time mixing pelleting to obtain a sintering mixed material A, a sintering mixed material B and a sintering mixed material C, and the calcium chlorate is added in a form of a saturated solution; and taking the sintering mixed material A as a bottom layer sintering material, taking the sintering mixed material B as a middle layer sintering material, taking the sintering mixed material C as an upper layer sinteringmaterial, igniting and drafting after adding all the three sintering mixed materials to perform sintering to obtain a finished product sintered ore. The calcium chlorate is added in the sintering mixed material, the calcium chlorate is heated and decomposed to release oxygen, so that the content of oxygen in the sintering material layer can be increased, the proportion of calcium ferrite in the sintered ore is increased, and the reducing property and the softening-melting and dropping property of the sintered ore are improved; meanwhile, the formed calcium chlorate is attached to the sinteredore uniformly, so that the low-temperature reducing pulverability of the sintered ore is improved.

Description

Technical field [0001] The invention relates to the field of sintering technology, and in particular to a method for improving the metallurgical properties of sintered ore. Background technique [0002] The sintering production process is to add the sintering mixture cloth to the sintering trolley, and ignite by exhaust air. The sintering is carried out from the surface to the inside from top to bottom. During the sintering process, a violent gas-solid-liquid multiphase reaction occurs, and the liquid is homogenized. , The formation of binder phase, the crystallization and recrystallization of minerals, the transformation of phase and crystal form, and finally cooling and condensing into sintered ore with different structural characteristics. The amount of oxygen pumped from top to bottom directly affects the vertical sintering speed, which in turn affects the operating speed of the sintering machine, the quality of the sinter, and the production efficiency. [0003] The metallurg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/24C22B1/16
CPCC22B1/16C22B1/24
Inventor 张辉夏铁玉周明顺刘帅翟立委刘杰徐礼兵孙雷
Owner ANGANG STEEL CO LTD
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