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Palletizing method of iron ore powder

A technology for iron ore and pelletizing, which is applied in the field of iron ore powder pelletization, and can solve problems such as inability to meet mass production requirements, no economy, unstable strength, etc.

Inactive Publication Date: 2012-07-25
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problems of the currently studied cold-setting pellet method are: (1) In order to meet the required strength of the pellet, in addition to adding the necessary binder to the powder, it is also necessary to add 10% iron-containing pellets. 90% iron powder, which increases the processing cost by about 380 yuan per ton, which is far beyond the expected cost; (2) The generation of pellet strength requires repeated watering of curing agents to maintain the pellets, which cannot meet the requirements of the assembly line. Large-scale production cannot meet the requirements of mass production; (3) The strength is unstable
According to statistics, in existing applications, if 1,000 tons of pellets are processed, only 300 tons can be used in the blast furnace, and the rest are pulverized. The yield is too low and uneconomical

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] Example 1 Take 400 kg of high-speed iron powder, 500 kg of medium-added powder, and 100 kg of mud ore, mix them in a roller mixer for 2 minutes, add 120 kg of composite binder composed of 90% A+10% B, and mix 6 It leaves the mixing mill in minutes and enters the conveyor belt forming machine. The shaped pellets pass through the conveyor belt at a temperature zone of 110°C for 40 minutes and then enter the temperature zone of 500°C for 40 minutes to obtain high-strength pellets.

Embodiment 2

[0008] Example 2 Take 400 kilograms of high-speed iron powder, 500 kilograms of added powder, and 100 kilograms of mud ore, mix them in a wheel mixer for 3 minutes, add 120 kilograms of composite binders composed of 95% A+5% B and mix 6 It leaves the mixing mill in minutes and enters the conveyor belt forming machine. The formed pellets pass through the conveyor belt at a temperature zone of 100°C for 40 minutes and then enter the temperature zone of 510°C for 40 minutes to obtain high-strength pellets.

Embodiment 3

[0009] Example 3 Take 400 kilograms of high-speed iron powder, 400 kilograms of added powder, and 200 kilograms of slime, and mix them in a roller mixer for 3 minutes, add 120 kilograms of composite binders composed of 95% A+5% B and mix 8 It leaves the mixing mill in minutes and enters the conveyor belt forming machine. The shaped pellets pass through the conveyor belt at a temperature zone of 110°C for 40 minutes and then enter the temperature zone of 500°C for 40 minutes to obtain high-strength pellets.

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Abstract

The invention relates to a palletizing method of iron ore powder. A preparation process of an iron ore pellet comprises the following steps of: placing the iron ore powder with different iron contents into a mixing mill according to certain weight percentage (determined according to the iron contents of various powder materials and the requirements for the total iron content of the iron ore pellet), milling in a mixing manner for 1-3 minutes, and then adding organic and inorganic composite binders; then milling in the mixing manner for 5-10 minutes so as to enter a transmission belt to a pellet forming machine; and enabling the formed pellet to enter a low-temperature furnace at a temperature of 100-120 DEG C through the transmission belt for drying for 30-60 minutes and then enter a high-temperature furnace at a temperature of 480-520 DEG C for drying for 30-60 minutes, wherein the intensity of the pellet can reach more than 1800 N so as to meet the requirements for smelting. The palletizing method is easy to realize the flow line large-scale production and has low production cost and wide application value in metallurgy industry.

Description

technical field [0001] The invention specifically relates to a method for pelletizing iron ore powder; it is a practical technology for metallurgical industry to smelt iron ore powder in a blast furnace and extract metal from the ore powder. technical background [0002] There is a strong air flow inside the ironmaking blast furnace body during the working process, and the powdered raw materials will be swept out of the furnace by the air flow and cannot be used. However, in the process of ore crushing, iron ore pulverization is inevitable, so how to make the powder It is one of the effective means to utilize valuable iron ore resources to spheroidize iron ore and meet the requirements of smelting. The main problems of the currently studied cold-setting pellet method are: (1) In order to meet the required strength of the pellets, in addition to adding the necessary binder to the powder, it is also necessary to add 10% iron-containing pellets. 90% iron powder, which increase...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/242
Inventor 王恩泽周龙王丽阁周永生裴重华
Owner SOUTHWEAT UNIV OF SCI & TECH
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