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A grate machine-series rotary kiln full-grain magnetization roasting process for refractory low-grade iron ore

A technology of magnetization roasting and iron ore, which is used in magnetic separation, chemical instruments and methods, solid separation, etc., can solve the problems of ring-shaped metal recovery rate, large particle size difference, and uneven roasting quality in the kiln body. The effect of increasing the area, improving the filling rate, and uniform roasting quality

Active Publication Date: 2016-06-29
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A grate machine-series rotary kiln full-grain magnetization 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 size range is: 30 parts for 5-15 mm size, 10 parts for 3-5 mm size, 15 parts for 1-3 mm size, 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 and roasted. The heating temperature of the iron...

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 particle size of 1-3mm and 5 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...

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Abstract

The invention provides a grate machine-tandem type rotary kiln full-grain magnetization roasting process for refractory low-grade iron ore, which mainly includes the following process steps: (1) Iron ore particle size classification: from 0 to 15mm particle size iron Four iron ores of 5-15mm, 3-5mm, 1-3mm and 0-1mm are sorted out from the ore; (2) Heated and oxidized by chain grate: iron ore with a particle size of 5-15mm is obtained in the chain grate Drying, preheating and oxidation; (3) Primary magnetization rotary kiln roasting: the iron oxide ore discharged from the chain grate, iron ore with a grain size of 3-5 mm and iron ore with a grain size of 1-3 mm are processed in a rotary kiln Magnetization roasting; (4) Secondary magnetization rotary kiln roasting: the pre-magnetized iron ore and grain-sized iron ore discharged from the primary magnetization rotary kiln are reduced by their own waste heat and reduced carbon in the secondary magnetization rotary kiln; ( 5) Grinding and magnetic separation of roasted ore.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and mineral engineering, and relates to a grate machine-tandem type rotary kiln full-grain magnetization roasting process for refractory low-grade iron ore. Background technique [0002] At present, with the continuous mining of high-grade iron ore in China and its depletion, as well as the rising price of iron ore, low-grade iron ore and composite symbiotic iron ore have a greater mining value and become the future use of iron ore. important direction. [0003] In the mining process of low-grade iron ore, generally 40-50% of the powdered iron ore with a particle size of 15mm or less will be produced. At present, the utilization methods of powdery low-grade iron ore mainly include magnetic separation, magnetization roasting and direct reduction. For refractory iron ore with a grade of 25-35% that needs to be magnetized and roasted, the iron ore with a particle size of more than 15mm is genera...

Claims

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Application Information

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Patent Type & Authority Patents(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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