Chain grate-tandem rotary kiln whole-particle fraction magnetic roasting process for refractory low-grade iron ore

A magnetized roasting and iron ore technology, which is applied in magnetic separation, chemical instruments and methods, solid separation, etc., can solve problems such as ringing metal recovery rate, large particle size difference, and uneven roasting quality in the kiln body, and achieve contact Increased area, improved filling rate, and uniform firing quality

Active Publication Date: 2014-11-26
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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Problems solved by technology

[0007] The present invention aims at the large difference in particle size, uneven roasting quality, kiln body prone to ringing and relatively low metal recovery rate in the process of magnetizing and roasting the rotary kiln when processing low-grade iron ore with a thickness of 0 to 15 mm at present in China. Low-grade iron ore problem, providing a refractory low-grade iron ore grate machine-tandem rotary kiln full-grain magnetization roasting process

Method used

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  • Chain grate-tandem rotary kiln whole-particle fraction magnetic roasting process for refractory low-grade iron ore

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Embodiment 1

[0035] A kind of refractory low-grade iron ore grate machine-tandem rotary kiln full-grain magnetization roasting process, including the following process steps:

[0036] (1) Iron ore particle size classification: Iron ore with a particle size greater than 15mm is crushed to make the particle size below 15mm, and the iron ore with a particle size of 0-15mm is first screened, and the 0-15mm iron ore is sorted out. 5mm, 5~15mm iron ore, and then adopt the method of winnowing to separate the 0~1mm, 1~3mm and 3~5mm iron ore from the iron ore with a particle size of 0~5mm. Ore; in terms of mass, the material ratio of iron ore in each particle size range is: 25 parts for 5-15mm particle size, 12 parts for 3-5mm particle size control, 13 parts for 1-3mm particle size control, 0-1mm particle size control is 28 parts;

[0037] (2) Grate heating and oxidation: Iron ore with a particle size of 5-15mm is added from the inlet of the grate. When the iron ore passes through the grate, the h...

Embodiment 2

[0045] The difference between embodiment 2 and embodiment 1 is:

[0046] In step (1), the material ratio of iron ore in each particle size range is: 30 parts for 5-15mm particle size, 10 parts for 3-5mm particle size control, 15 parts for 1-3mm particle size control, 0 ~1mm particle size control is 25 parts;

[0047] In step (2), the heating time of the control material is 15 minutes;

[0048] In step (3), the 900-950°C iron oxide ore discharged from the grate is mixed with 3-5mm grain-sized iron ore and 5 parts of 0-3mm grain-sized coal, and then added to the primary magnetization rotary kiln; When the ore moves to the middle area of ​​the rotary kiln, iron ore with a particle size of 1-3mm and 3 parts of coal powder with a particle size of 0-1mm are injected from the kiln head of the primary magnetization rotary kiln, and the mixed material is mixed with iron ore with a particle size of 1-3mm and 0 Coal powder with a particle size of ~1mm is mixed twice and then magnetized...

Embodiment 3

[0053] The difference between embodiment 3 and embodiment 1 is:

[0054] In step (1), the material ratio of iron ore in each particle size range is: 35 parts for 5-15mm particle size, 15 parts for 3-5mm particle size control, 10 parts for 1-3mm particle size control, 0 ~1mm particle size control is 35 parts;

[0055] In step (2), the heating time of the control material is 25 minutes;

[0056] In step (3), the 900-950°C iron oxide ore discharged from the grate is mixed with 3-5mm grain-sized iron ore and 2 parts of 0-3mm grain-sized coal, and then added to the primary magnetization rotary kiln; When the ore moves to the middle area of ​​the rotary kiln, iron ore with a grain size of 1-3mm and 5 parts of coal powder with a grain size of 0-1mm are sprayed from the kiln head of the primary magnetization rotary kiln, and the mixed material is mixed with iron ore with a grain size of 1-3mm and 0 Coal powder with a particle size of ~1mm is mixed for the second time and continues t...

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Abstract

The invention provides a chain grate-tandem rotary kiln whole-particle fraction magnetic roasting process for refractory low-grade iron ore. The process mainly comprises the following steps: (1) particle size grading of the iron ore: a step of selecting iron ore respectively with particle sizes of 5 to 15 mm, 3 to 5 mm, 1 to 3 mm and 0 to 1 mm from iron ore with particle sizes of 0 to 15 mm; (2) heating and oxidizing in a chain grate: a step of drying, preheating and oxidizing the iron ore with particle sizes of 5 to 15 mm in the chain grate; (3) roasting in a primary magnetizing rotary kiln: a step of subjecting the oxidized iron ore discharged from the chain grate, the iron ore with particle sizes of 3 to 5 mm and the iron ore with particle sizes of 1 to 3 mm to magnetic roasting in the primary rotary kiln; (4) roasting in a secondary magnetizing rotary kiln: a step of allowing the premagnetized iron ore discharged from the primary rotary kiln and the iron ore with particle sizes of 0 to 1 mm to undergo a reduction reaction with reductive carbon in the secondary rotary kiln in virtue of waste heat of the iron ore; and (5) grinding and magnetic separation of the roasted ore.

Description

Technical field [0001] The present invention belongs to the field of metallurgical and mineral engineering technology, involving a difficult-to-choose low-grade iron ore chain pupae-series rotating kiln full-granular magnetic roasting process. Background technique [0002] At present, with the continuous mining of domestic high -quality iron ore, and the continuous rise in the price of iron ore, the price of iron ore and composite symbiotic iron ore has greater mining value, and it has become the future use.Important direction. [0003] During the mining process of low -grade iron ore, 40-50%of the particle size is generally produced by a powder -shaped iron ore below 15mm.At present, the use of powder -like low -quality iron ore mainly includes magnetic selection, magnetic roasting and direct reduction.For 25-35%of the grade that needs to be performed by magnetized roasting, the iron ore with a particle size of 15mm or more is generally used in the country.Iron ore with a partic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02B03C1/015
Inventor 王明华展仁礼权芳民雷鹏飞张科郭忆李慧春马胜军白鹏飞王欣
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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