Method for drying-in-shade pelletizing by using converter waste gas

A technology for waste gas and converter, which is applied in the field of using converter waste gas to dry in the shade, can solve the problems of large loss of sensible heat and latent chemical heat of converter waste gas, high cost of pelletizing process, long pelletizing time, etc. The effect of high compressive strength and improved ball formation rate

Active Publication Date: 2021-06-08
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a method for making pellets by using converter waste gas in the shade, which solves the problems of large loss of physical sensible heat and chemical latent heat of converter waste gas and the high cost of the existing pelletizing process. long technical question

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  • Method for drying-in-shade pelletizing by using converter waste gas
  • Method for drying-in-shade pelletizing by using converter waste gas

Examples

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Embodiment 1

[0061] This embodiment provides a method for making pellets by using converter exhaust gas in the shade, including the following steps: S1. Preparation of raw materials: treating vanadium-titanium-magnetite powder to a particle size below 35 mesh.

[0062] S2. Pressurized pulping: After the vanadium-titanium magnetite powder, bentonite and water are fully mixed and stirred, a pressure of 5000N is used to pressurize and control the water to form a non-Newtonian fluid slurry.

[0063] S3. Pressurized granulation: the pulp is pressurized and extruded through a round-hole die to prepare green balls, and the obtained green balls have a diameter of 8mm.

[0064] S4. Drying and pre-burning: transport the green balls to the dryer, pass the first converter waste gas with a temperature of 1100°C into the dryer to dry the green balls, and use the oxidative atmosphere of the first converter waste gas to treat the raw The balls were micro-oxidized and calcined for 5 minutes to obtain pelle...

Embodiment 2

[0068] This embodiment provides a method for making pellets in the shade using converter waste gas, which includes the following steps:

[0069] S1. Preparation of raw materials: process the ore powder to a particle size below 35 mesh.

[0070] S2. Pressurized pulping: After the mineral powder, additives and water are fully mixed and stirred, a pressure of 10000N is used to pressurize and control the water to form a non-Newtonian fluid slurry.

[0071] S3. Pressurized granulation: the pulp is pressurized and extruded through a round-hole die to prepare green balls, and the obtained green balls have a diameter of 12 mm.

[0072] S4. Drying and pre-burning: transport the green balls to the dryer, pass the waste gas of the first converter at a temperature of 900°C into the dryer, and dry the green balls, and use the oxidative atmosphere of the first converter waste gas to treat the raw The balls were micro-oxidized and calcined for 10 minutes to obtain pellets.

[0073] S5. Hig...

Embodiment 3

[0076] This embodiment provides a method for making pellets in the shade using converter waste gas, which includes the following steps:

[0077] S1. Preparation of raw materials: process the ore powder to a particle size below 35 mesh.

[0078] S2. Pressurized pulping: After the mineral powder, additives and water are fully mixed and stirred, a pressure of 5000N is used to pressurize and control the water to form a non-Newtonian fluid slurry.

[0079] S3. Pressurized granulation: The pulp block is pressurized and extruded through a round-hole die to prepare green balls, and the obtained green balls have a diameter of 8.5 mm.

[0080] S4. Drying and pre-burning: transport the green balls to the dryer, pass the first converter waste gas with a temperature of 1100°C into the dryer to dry the green balls, and use the oxidative atmosphere of the first converter waste gas to treat the raw The balls were micro-oxidized and calcined for 10 minutes to obtain pellets.

[0081] S5. Hig...

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Abstract

The invention relates to a method for drying-in-shade pelletizing by using converter waste gas. The method comprises the following steps of S1, preparing raw materials; S2, pressurizing and making slurry; S3, pressurizing and granulating; S4, drying and pre-burning; and S5, high-temperature roasting. All heat of drying and pre-burning in the step S4 comes from first converter waste gas, and high-temperature roasting heat in the step S5 comes from second converter waste gas; and the temperature of the first converter waste gas is lower than that of the second converter waste gas, the CO content in the first converter waste gas is lower than that of the second converter waste gas, and the CO2 content in the first converter waste gas is higher than that of the second converter waste gas. Drying and high-temperature roasting are carried out in the pelletizing process, and compared with a traditional pelletizing process, the technological process is shortened, and the time is shortened; a process technology different from the traditional pelletizing process is provided, so that the production efficiency is improved; and the process parameters of obtained pellets are basically superior to those of traditional pellets, the pelletizing rate is increased, and the requirements of blast furnace smelting are met.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgical gas waste recovery and comprehensive utilization of resources, in particular to a method for making pellets by using converter waste gas in the shade. Background technique [0002] Pellets, especially all-vanadium-titanium acidic or basic pellets for vanadium-titanium magnetite blast furnaces. The existing pelletizing mainly adopts the "grate machine-rotary kiln" process. The production process of the pellets firstly requires a high particle size of the raw material, which needs to be below 400 mesh, and then prepares green pellets through a disc pelletizer. Prepare cooked balls by pre-calcination-roasting two-stage heat treatment. To prepare green balls, it is necessary to continuously roll the ore powder to grow into pellets of about 8-12 mm. To prepare lost balls, the balls are transported to the rotary kiln through a grate machine, first undergo oxidation and pre-calcina...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/248
CPCC22B1/248C22B1/2406
Inventor 薛向欣宋翰林张金鹏程功金刘建兴杨合高子先黄壮
Owner NORTHEASTERN UNIV
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