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System and method for producing pellet

A technology for pellets and green pellets, which is applied in the field of systems for producing pellets, can solve the problems of low single-machine production capacity, high production and maintenance costs, uneven heating, etc., so as to reduce equipment and production costs and shorten production processes. Process, the effect of reducing the amount of powder returned

Pending Publication Date: 2018-03-20
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shaft furnace roasting process is the earliest pellet roasting method adopted in the world. The drying, preheating, roasting and cooling of the green pellets are all carried out and completed in a rectangular shaft furnace. This method has simple process, compact structure and low investment. , but due to its small single-machine production capacity and poor adaptability to raw materials, it is generally only suitable for roasting magnetite pellets, and cannot handle hematite, limonite, etc., uneven heating, poor product quality, etc. However, there are many insurmountable flaws in this method, which make this method more problematic
The belt roasting machine process requires a large amount of heat-resistant alloy steel, high production and maintenance costs, high requirements for the stability of raw materials in the production process, and uneven quality of finished pellets. Gas or heavy oil with high calorific value must be used as fuel.
The grate machine-rotary kiln process is carried out in different equipment due to the drying, preheating, roasting, soaking and cooling processes, so the process and equipment layout is not compact enough, and the floor space is also large; the total tonnage of the equipment is relatively large. Heavy, complex process and equipment design, large investment
In the process of roasting green pellets into pellets in the prior art, each equipment is not related. For example, after roasting the pellets with a large amount of heat generated in the roasting equipment, there is still a large amount of waste heat, which is directly discharged to the outside, causing serious waste of energy

Method used

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  • System and method for producing pellet
  • System and method for producing pellet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] A certain hematite TFe53.6% is mixed with bentonite and water to make pellets to obtain green pellets with a particle size of 8-16mm and a moisture content of 8.7%; put the green pellets into the ring roasting device, and make the green pellets The pellets are sequentially dried, preheated, roasted and soaked through the drying zone, preheating zone, roasting zone and soaking zone to obtain metallized pellets, wherein the angle of the drying zone is 80° and the temperature is 250°C; The angle of the preheating zone is 105° and the temperature is 350-950°C; the angle of the roasting zone is 135° and the temperature is 1350°C; the angle of the soaking zone is 40° and the temperature is 1100°C; the thickness of the fabric is 60mm. The metallized pellets were subjected to a cooling treatment to obtain pellets having an average compressive strength of 2695 N / ball and a FeO content of 0.21%.

Embodiment 2

[0077] A certain magnetite TFe61.2% is mixed with bentonite and water to make pellets to obtain green pellets with a particle size of 8-16mm and a moisture content of 9.3%; put the green pellets into the ring-shaped roasting device, and make the green pellets The pellets are sequentially dried, preheated, roasted and soaked in the overdrying zone, preheating zone, roasting zone and soaking zone in order to obtain metallized pellets, wherein the angle of the drying zone is 75° and the temperature is 200 ℃; the angle of the preheating zone is 135°, and the temperature is 400-1000°C; the angle of the roasting zone is 120°, and the temperature is 1250°C; the angle of the soaking zone is 30°, and the temperature is 1050°C; the thickness of the fabric is 100mm. The metallized pellets were cooled to obtain pellets, wherein the pellets had an average compressive strength of 3250N / ball and a FeO content of 0.63%.

Embodiment 3

[0079] A certain limonite TFe45.6% is mixed with bentonite and water to make pellets to obtain green pellets with a particle size of 8-16mm and a moisture content of 12.3%; put the green pellets into the ring roasting device, and make the green pellets The pellets are sequentially dried, preheated, roasted and soaked through the drying zone, preheating zone, roasting zone and soaking zone in order to obtain metallized pellets, wherein the angle of the drying zone is 105° and the temperature is 300°C; The angle of the preheating zone is 120° and the temperature is 400-1000°C; the angle of the roasting zone is 105° and the temperature is 1300°C; the angle of the soaking zone is 30° and the temperature is 1000°C; the cloth thickness is 150mm. The metallized pellets were subjected to a cooling treatment to obtain pellets having an average compressive strength of 2234 N / ball and a FeO content of 0.81%.

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Abstract

The invention discloses a system and a method for producing a pellet, wherein the system comprises a pellet making device, an annular roasting device and a cooling device; the pellet making device comprises an iron-containing material inlet, an additive inlet, a water inlet and a raw pellet outlet; the annular roasting device comprises an annular furnace body and a plurality of nozzles; a furnacechamber is defined inside the furnace body; a drying region, a preheating region, a roasting region and a uniform heating region which communicate with one another are defined in the furnace chamber;the drying region comprises a feeding hole which is connected with the raw pellet outlet; the preheating region and the roasting region are each provided with a flue; the uniform heating region comprises a discharging hole; the bottom wall of the annular furnace body is rotatable and is suitable for supporting a material to sequentially pass through the drying region, the preheating region, the roasting region and the uniform heating region; and the plurality of nozzles are arranged on the inner wall of the annular furnace body and are suitable for injecting gas and air into the furnace chamber. The system is low in equipment cost and production cost and applicable to various iron-containing materials, and when being adopted for producing the pellet, the system also has the advantages of short technological process, good pellet quality and the like.

Description

technical field [0001] The invention belongs to the field of metallurgy, in particular, the invention relates to a system and method for producing pellets. Background technique [0002] At present, the main roasting processes of pellets mainly include shaft furnace pellet production process, belt roaster pellet production process and chain grate-rotary kiln pellet production process. The shaft furnace roasting process is the earliest pellet roasting method adopted in the world. The drying, preheating, roasting and cooling of the green pellets are all carried out and completed in a rectangular shaft furnace. This method has simple process, compact structure and low investment. , but due to its small single-machine production capacity and poor adaptability to raw materials, it is generally only suitable for roasting magnetite pellets, and cannot handle hematite, limonite, etc., uneven heating, poor product quality, etc. However, there are many problems in this method due to t...

Claims

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Application Information

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IPC IPC(8): C22B1/24C22B1/02C22B1/26
CPCC22B1/02C22B1/2406C22B1/26
Inventor 闫方兴任中山石晓莉曹志成吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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