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Carbon-containing pellet reducing system and method

A technology of carbon pellets and pellets, which is applied in the field of metallurgy, can solve problems such as pellet melting, achieve the effects of reducing the amount of coal powder, inhibiting the production of dioxins and other harmful substances, and improving the metallization rate

Pending Publication Date: 2018-05-15
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the reduction temperature is increased, the pellets can be fully reduced, but the pellets will melt again

Method used

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  • Carbon-containing pellet reducing system and method
  • Carbon-containing pellet reducing system and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] In this embodiment, copper slag is used as iron material, and the process of preparing carbon-containing pellets and reducing them is as follows:

[0063] 1. Send waste plastics to the cleaning device for cleaning to obtain clean plastics.

[0064] 2. Send the clean plastic to the plastic dryer for drying to obtain the dried plastic. The drying temperature is 80°C and the drying time is 15 minutes.

[0065] 3. Send the dried plastic to a crusher for crushing to obtain waste plastic particles, the particle size of which is 1mm.

[0066] 4. Send the waste plastic particles to the dechlorination device for dechlorination. The dechlorination temperature is 300°C to obtain molten dechlorinated plastics; the generated hydrogen chloride is passed into the absorption tank for treatment.

[0067] 5. Send copper slag and molten dechlorinated plastic to the first mixer and mix evenly to obtain the first mixture; the mass ratio of iron material to molten dechlorinated plastic is 1...

Embodiment 2

[0074] In this embodiment, lead-zinc slag is used as iron material, and the process of preparing carbon-containing pellets and reducing them is as follows:

[0075] 1. Send waste plastics to the cleaning device for cleaning to obtain clean plastics.

[0076] 2. Put the clean plastic into the plastic dryer for drying to obtain the dried plastic. The drying temperature is 150°C and the drying time is 5 minutes.

[0077] 3. Send the dried plastic to a crusher for crushing to obtain waste plastic particles, the particle size of which is 2mm.

[0078] 4. The waste plastic particles are sent to the dechlorination device for dechlorination. The dechlorination temperature is 250°C to obtain molten dechlorinated plastics; the generated hydrogen chloride is passed into the absorption tank for treatment.

[0079] 5. Send lead-zinc slag and molten dechlorinated plastic into the first mixer and mix evenly to obtain the first mixture; the mass ratio of lead-zinc slag to molten dechlorinate...

Embodiment 3

[0086] In this embodiment, iron vanadium slag is used as iron material, and the process of preparing carbon-containing pellets and reducing them is as follows:

[0087] 1. Send waste plastics to the cleaning device for cleaning to obtain clean plastics.

[0088] 2. Send the clean plastic to the plastic dryer for drying to obtain the dried plastic. The drying temperature is 100°C and the drying time is 10 minutes.

[0089] 3. Send the dried plastic to a crusher for crushing to obtain waste plastic particles, the particle size of which is 3mm.

[0090] 4. Send the waste plastic particles into the dechlorination device for dechlorination. The dechlorination temperature is 350°C to obtain molten dechlorinated plastics; the generated hydrogen chloride is passed into the absorption tank for treatment.

[0091] 5. Feed the iron vanadium slag and molten dechlorinated plastic into the first mixer and mix evenly to obtain the first mixture; the mass ratio of iron material to molten dechl...

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Abstract

The invention discloses a carbon-containing pellet reducing system and method. The carbon-containing pellet reducing system comprises a dechlorination device, a first material mixer, a first pelletizer, a second pelletizer, a pellet drying machine and a rotary hearth furnace, wherein a thermal dechlorination plastic outlet of the dechlorination device is connected with a thermal dechlorination plastic inlet of the first material mixer; a first mixture outlet of the first material mixer is connected with a first mixture inlet of the first pelletizer; a primary pellet outlet of the first pelletizer is connected with a primary pellet inlet of the second pelletizer; a compound pellet outlet of the second pelletizer is connected with a compound pellet inlet of the pellet drying machine; a dry pellet outlet of the pellet drying machine is connected with a dry pellet inlet of the rotary hearth furnace. According to the carbon-containing pellet reducing system and the method which are disclosed by the invention, waste plastic is fully used, the porosity of compound pellets is increased, generation of harmful substances is avoided, the use amount of coal ash is reduced, and the energy consumption of the rotary hearth furnace is reduced.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a novel carbon-containing pellet reduction system and method. Background technique [0002] In the field of metallurgy, a commonly used process is to pelletize the material and then proceed to the next step of processing. The pelletizing process is to mix the iron-containing materials, flux, binder, etc., and then pelletize on a disc pelletizer. After drying, it is directly reduced in a rotary hearth furnace. The reducing atmosphere depends on the carbon monoxide gas generated by the coal base. The carbon-containing pellets produced by this pelletizing method have low porosity and poor reducibility. The reduction time in the rotary hearth furnace is relatively long and the reduction temperature is high, which requires a large amount of energy consumption and easily causes waste of resources and energy. [0003] During the pilot test, if the reduction temperature i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/244C22B1/248
CPCC22B1/2406C22B1/244C22B1/248
Inventor 王福佳王建华王健月古明远王敏吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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