A method of pre-treatment and batching of red mud in a sinter batching process

Abstract

The application discloses a kind of pre-treatment and batching method of red mud in sintering batching process, comprising the following steps: red mud is laid on the ground and naturally aired for more than 12h, to ensure that moisture is 10%~15%; the red mud after airing is placed on the roll crusher and crushed, the particle size after crushing is less than 3mm; the crushed red mud is placed in the mixing equipment, 5%~10% of quicklime powder is added, stirred for 5min~10min, to obtain a mixture; 3%~5% of sintering return ore is added to the mixture, the particle size of sintering return ore is below 3mm, and stirred for 3min~5min; 1%~2% of mist water is added to the mixture, the addition time is 2min~3min, and the stirring time is 5min~7min; after the mixture added with sintering return ore and mist water is discharged from the mixing equipment, it is added to sintering batching according to the proportion of 5%~10%, and the batching process is completed; the method is simple in operation and convenient in processing, small particles are generated from red mud and sintering return ore in the production process, the strength of small particles is further increased under the action of quicklime, dust generated from red mud in high temperature process is eliminated, and the controllability of sintering process is improved.

Description

Technical Field

[0001] This invention belongs to the field of sintering batching technology, specifically relating to a method for pretreatment and batching of red mud in the sintering batching process. Background Technology

[0002] Sintering is the precursor to the steel industry. It involves using powdered iron-containing materials, quicklime, and recycled ore through combustion and other chemical reactions to produce lumpy sinter with specific metallurgical properties. Red mud, an iron-containing material, is frequently added to the sintering batch. Furthermore, as a chemical waste, red mud, after sintering, promotes the comprehensive utilization of waste. However, red mud has a high moisture content and fine particle size, making it prone to agglomeration when added directly to the batching process, affecting the normal operation of the sintering process. Moreover, lumpy red mud easily generates dust during sintering, increasing the pressure on subsequent dust removal, thus making red mud recycling extremely difficult. Currently, most manufacturers are cautious about adding red mud back to the sintering process, leading to difficulties in red mud recovery.

[0003] Therefore, how to efficiently add red mud to the sintering batch without affecting the sintering process is the main research direction at present. Summary of the Invention

[0004] The purpose of this invention is to provide a method for pretreatment and batching of red mud during the sintering process.

[0005] The technical solution adopted by this invention to solve its technical problem is: a method for pretreatment and batching of red mud in the sintering process, comprising the following steps:

[0006] 1) Spread the red mud evenly on the ground and let it air dry naturally for more than 12 hours, ensuring that the moisture content is between 10% and 15%;

[0007] 2) Place the dried red mud on a double-roll crusher to crush it until the particle size is less than 3mm.

[0008] 3) Place the crushed red mud in a mixing device, add 5% to 10% quicklime powder, and stir for 5 to 10 minutes to obtain a mixture;

[0009] 4) Add 3% to 5% of sintered return ore to the mixture. The particle size of the sintered return ore should be less than 3 mm. Stir for 3 to 5 minutes.

[0010] 5) Add 1% to 2% mist water to the mixture over 2 to 3 minutes, and stir for 5 to 7 minutes.

[0011] 6) After the mixture of sintered return ore and mist water is discharged from the mixing equipment, it is added to the sintering batch at a ratio of 5% to 10% to complete the batching process.

[0012] The present invention has the following beneficial effects: the method is simple to operate and convenient to process. During the production process, red mud and sintered return ore are converted into small particles, and the strength of the small particles is further increased under the action of quicklime. This eliminates the generation of dust in red mud during high-temperature processes and improves the controllability of the sintering process. Detailed Implementation

[0013] The invention will now be described in further detail.

[0014] A method for pretreatment and batching of red mud in sintering process, characterized by comprising the following steps:

[0015] 1) Spread the red mud evenly on the ground and let it air dry naturally for more than 12 hours, ensuring that the moisture content is between 10% and 15%;

[0016] 2) Place the red mud from step 1) on a double roll crusher for crushing. The particle size after crushing is less than 3mm.

[0017] 3) Place the red mud from step 2) into a mixing device, add 5-10% quicklime powder, and stir for 5-10 minutes;

[0018] 4) Add 3-5% of sintered return ore to the mixture in step 3), the particle size of the sintered return ore is less than 3 mm, and stir for 3-5 minutes;

[0019] 5) Add 1-2% mist water to the mixture in step 4) for 2-3 minutes, and stir for 5-7 minutes.

[0020] 6) After the mixture from step 5) is discharged from the mixing equipment, it is added to the sintering batch at a ratio of 5-10% to complete the batching process.

[0021] Example 1:

[0022] A method for pretreatment and batching of red mud in sintering process, characterized by comprising the following steps:

[0023] 1) Spread the red mud evenly on the ground and let it air dry naturally for more than 12 hours to ensure that the moisture content is below 10%;

[0024] 2) Place the red mud from step 1) on a double roll crusher for crushing. The particle size after crushing is less than 3mm.

[0025] 3) Place the red mud from step 2) into a mixing device, add 5% quicklime powder, and stir for 5 minutes;

[0026] 4) Add 3% sintered return ore to the mixture in step 3), the particle size of the sintered return ore is less than 3 mm, and stir for 3 min;

[0027] 5) Add 1% mist water to the mixture in step 4) over 2 minutes, and stir for 5 minutes.

[0028] 6) After the mixture from step 5) is discharged from the mixing equipment, it is added to the sintering batch at a ratio of 5% to complete the batching process.

[0029] Example 2:

[0030] A method for pretreatment and batching of red mud in sintering process, characterized by comprising the following steps:

[0031] 1) Spread the red mud evenly on the ground and let it air dry naturally for more than 12 hours to ensure that the moisture content is below 15%;

[0032] 2) Place the red mud from step 1) on a double roll crusher for crushing. The particle size after crushing is less than 3mm.

[0033] 3) Place the red mud from step 2) into a mixing device, add 10% quicklime powder, and stir for 10 minutes;

[0034] 4) Add 5% sintered return ore to the mixture in step 3), the particle size of the sintered return ore is less than 3 mm, and stir for 5 min;

[0035] 5) Add 2% mist water to the mixture in step 4) over 3 minutes, and stir for 7 minutes.

[0036] 6) After the mixture from step 5) is discharged from the mixing equipment, it is added to the sintering batch at a ratio of 10% to complete the batching process.

[0037] Example 3:

[0038] A method for pretreatment and batching of red mud in sintering process, characterized by comprising the following steps:

[0039] 1) Spread the red mud evenly on the ground and let it air dry naturally for more than 12 hours to ensure that the moisture content is 13%;

[0040] 2) Place the red mud from step 1) on a double roll crusher for crushing. The particle size after crushing is less than 3mm.

[0041] 3) Place the red mud from step 2) into a mixing device, add 7% quicklime powder, and stir for 8 minutes;

[0042] 4) Add 4% sintered return ore to the mixture in step 3), the particle size of the sintered return ore is less than 3 mm, and stir for 4 min;

[0043] 5) Add 1.5% mist water to the mixture in step 4) over a period of 2.5 minutes, and stir for 6 minutes.

[0044] 6) After the mixture from step 5) is discharged from the mixing equipment, it is added to the sintering batch at a ratio of 8% to complete the batching process.

[0045] This invention is not limited to the above-described embodiments. Anyone should know that any structural changes made under the guidance of this invention, and any technical solutions that are the same as or similar to this invention, fall within the protection scope of this invention.

[0046] The technologies, shapes, and structures not described in detail in this invention are all known technologies.

Claims

1. A method for pretreatment and batching of red mud in the sintering process, characterized in that, Includes the following steps: 1) Spread the red mud evenly on the ground and let it air dry naturally for more than 12 hours, ensuring that the moisture content is between 10% and 15%; 2) Place the dried red mud on a double-roll crusher to crush it until the particle size is less than 3mm. 3) Place the crushed red mud in a mixing device, add 5% to 10% quicklime powder, and stir for 5 to 10 minutes to obtain a mixture; 4) Add 3% to 5% of sintered return ore to the mixture. The particle size of the sintered return ore should be less than 3 mm. Stir for 3 to 5 minutes. 5) Add 1% to 2% mist water to the mixture over 2 to 3 minutes, and stir for 5 to 7 minutes. 6) After the mixture of sintered return ore and mist water is discharged from the mixing equipment, it is added to the sintering batch at a ratio of 5% to 10% to complete the batching process.