Pellet and preparation method thereof

A technology for pelletizing and returning ore, applied in the field of blast furnace charge, can solve problems such as increased fuel consumption, fluctuations in sintering production process, and reduced sinter strength

Active Publication Date: 2021-07-30
SHOUGANG JINGTANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But sintering and adding too much blast furnace return ore will cause fuel consumption to increase, and the strength of sinter ore will decrease at the same time; at the same time, it will cause fluctuations in the sinter production process

Method used

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  • Pellet and preparation method thereof
  • Pellet and preparation method thereof
  • Pellet and preparation method thereof

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preparation example Construction

[0052] According to another typical embodiment of the present invention, a method for preparing pellets is provided, the method comprising:

[0053] S1. Obtain blast furnace return;

[0054] Specifically, to obtain blast furnace rebates, including:

[0055] The rough blast furnace return ore is finely ground by a wet separation and grinding process to obtain the blast furnace return ore. In terms of weight, the blast furnace return ore with a particle size of -200 mesh accounts for more than 80% of the blast furnace return ore, and the moisture content of the blast furnace return ore is less than 10%.

[0056] S2. Mix the blast furnace return ore, pellet concentrate powder, alkalinity regulator and binder to obtain a mixture; wherein, the weight of the blast furnace return ore is 3%-12% of the weight of the entire pellet ore ; The pellet concentrate powder includes magnetite and hematite; the alkalinity regulator is used to control the alkalinity of the pellets to be 1.1 ± 0...

Embodiment 1

[0069] The first step: Finely grind the blast furnace return ore. First, the blast furnace return ore is finely ground to -200 mesh particle size of 83% and moisture content of about 9.5% by ball mill wet separation grinding process.

[0070] The second step: batching: batching magnetite concentrate, hematite concentrate, finely ground blast furnace return ore, slaked lime, and binder according to the quality requirements of the pellets. In parts by weight, there are 3 parts of finely ground blast furnace return ore, 90 parts of magnetite, 4 parts of hematite, 2.10 parts of slaked lime, and 0.9 part of calcium-based bentonite.

[0071] Step 3: Mixing: Fully mix various pellet powders and binders.

[0072] Step 4: Pelletizing: On the disc pelletizing machine, add suitable water to pelletize, and control it at 8.5±0.5%.

[0073] Step 5: Screening of green balls: Use double-layer roller sieves to screen out qualified green balls with a particle size of 8mm-16mm.

[0074] Step 6...

Embodiment 2

[0077] The first step: Finely grind the blast furnace return ore. First, the blast furnace return ore is finely ground to -200 mesh particle size of 85% and moisture content of about 9.8% by ball mill wet separation grinding process.

[0078] The second step: batching: batching magnetite concentrate, hematite concentrate, finely ground blast furnace return ore, slaked lime, and binder according to the quality requirements of the pellets. In parts by weight, there are 4 parts of finely ground blast furnace return ore, 86 parts of magnetite, 7 parts of hematite, 2.05 parts of slaked lime, and 0.95 parts of calcium-based bentonite.

[0079] Step 3: Mixing: Fully mix various pellet powders and binders.

[0080] Step 4: Pelletizing: On the disc pelletizing machine, add suitable water to pelletize, and control it at 8.5±0.5%.

[0081] Step 5: Screening of green balls: Use double-layer roller sieves to screen out qualified green balls with a particle size of 8mm-16mm.

[0082] Step...

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Abstract

The invention particularly relates to a pellet and a preparation method thereof, and belongs to the technical field of blast furnace burden. The pellet comprises the following components of blast furnace return mine, pellet fine powder, an alkalinity regulator and a binder, wherein the weight of the blast furnace return mine is 3-12% of the weight of the whole pellet; the pellet fine powder comprises magnetite and hematite; and the alkalinity regulator is used for controlling the alkalinity of the pellet to be 1.1 +/-0.1. The pellet and the method provide a new utilization approach for the blast furnace return mine, improve the reuse value of the blast furnace return mine, not only can realize efficient resource utilization of valuable elements such as Fe, Ca, Mg and Ti in the blast furnace return mine, but also can produce pellet with excellent quality, environment friendliness and lower cost, meanwhile, after the blast furnace return mine is added, the reduction expansion rate of the pellet is effectively reduced, the blast furnace return mine is added to replace part of high-price pellet concentrate powder, pellet which is good in quality, environmentally friendly and low in cost is produced, and larger environmental benefits, social benefits and economic benefits are obtained.

Description

technical field [0001] The invention belongs to the technical field of blast furnace charge, in particular to a pellet and a preparation method thereof. Background technique [0002] The blast furnace charge structure refers to the composition of the iron-containing charge that is put into the blast furnace during the blast furnace ironmaking process, and the blast furnace contains iron into the charge. Reasonable matching of blast furnace charge in blast furnace ironmaking production can reduce fuel consumption and save cost, especially in the face of increasingly severe environmental protection situation, reducing CO 2 Emissions, cost reduction and efficiency increase, and environmentally friendly production methods are major issues that modern iron and steel complexes are very concerned about. The structure of high proportion of pellets, energy saving, low carbon and environmental protection is an important technical direction for the green development of blast furnace i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/243C21B5/00
CPCC22B1/2406C22B1/243C21B5/008Y02P10/20
Inventor 马成伟安钢王凯刘文旺董相娟曹宇康海军吴小江李明李建华贺金文孙大为钱瑞清耿朝阳
Owner SHOUGANG JINGTANG IRON & STEEL CO LTD
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