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Shaft furnace coal-based magnetization roasting method for carbon-containing pellets of powdery refractory low-grade iron ore

A magnetized roasting and iron ore technology, applied in chemical instruments and methods, magnetic separation, solid separation, etc., can solve the problems of high roasting cost, uneven ore reduction, ring formation, etc.

Active Publication Date: 2016-08-24
JIUQUAN IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a coal-based magnetization roasting method for powdery refractory low-grade iron ore carbonaceous pellet shaft furnace, to solve the problem of large differences in particle size in the iron ore roasting process in the prior art. Problems of uneven ore reduction, high roasting cost, and ring formation in rotary kiln production

Method used

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  • Shaft furnace coal-based magnetization roasting method for carbon-containing pellets of powdery refractory low-grade iron ore
  • Shaft furnace coal-based magnetization roasting method for carbon-containing pellets of powdery refractory low-grade iron ore

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Experimental program
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Effect test

Embodiment 1

[0057] Step 1: raw material preparation, dry the powdered iron ore with a water content greater than 7%, send the hot waste gas to the dryer through the combustion furnace, and fully contact and convect heat between the iron ore and the hot waste gas to make the material Part of the water is evaporated and taken away by the smoke;

[0058] Step 2: dry grinding of iron ore and ball milling of coal, 90% of the grinding fineness is greater than 325 mesh, 96% of the coal particle size is 0.074mm; Raymond mill is used for dry grinding, and the carbon content of coal is 79.1 % more than bituminous coal.

[0059] Step 3: batching of the carbon-containing mixture, mixing the ground iron ore powder, coal powder and bentonite in a ratio of 94.0: 3.0: 3.0;

[0060] Step 4: Grinding of the mixture, the prepared mixture enters the grinding machine, and the grinding time is 6 minutes;

[0061] Step 5: Pelletizing the mixture, conveying the finely ground material to the pelletizing disc, s...

Embodiment 2

[0066] Step 1: raw material preparation, dry the powdered iron ore with a water content greater than 7%, send the hot waste gas to the dryer through the combustion furnace, and fully contact and convect heat between the iron ore and the hot waste gas to make the material Part of the water evaporates and is taken away by the flue gas.

[0067] Step 2: Iron ore dry grinding and coal ball milling, the grinding fineness is greater than 325 mesh, accounting for 90%, and the coal particle size is 0.074mm, accounting for 96%.

[0068] Step 3: batching of the carbon-containing mixture, mixing the ground iron ore powder, coal powder and bentonite according to the ratio of 94.5: 2.5: 3.0.

[0069] Step 4: The moistening and grinding of the mixture, the prepared mixture enters the moistening mill, and the moistening time is 7 minutes.

[0070] Step 5: Pelletizing the mixture, conveying the finely ground material to the pelletizing disc, and spraying water to wet the finely ground materi...

Embodiment 3

[0075] Step 1: raw material preparation, dry the powdered iron ore with a water content greater than 7%, send the hot waste gas to the dryer through the combustion furnace, and fully contact and convect heat between the iron ore and the hot waste gas to make the material Part of the water evaporates and is taken away by the flue gas.

[0076] Step 2: Iron ore dry grinding and coal ball milling, the grinding fineness is greater than 325 mesh, accounting for 90%, and the coal particle size is 0.074mm, accounting for 96%.

[0077] Step 3: batching of the carbon-containing mixture, mixing the ground iron ore powder, coal powder and bentonite according to the ratio of 94.5: 2.5: 3.0.

[0078] Step 4: The moistening and grinding of the mixture, the prepared mixture enters the moistening mill, and the moistening time is 7 minutes.

[0079] Step 5: Pelletizing the mixture, conveying the finely ground material to the pelletizing disc, and spraying water to wet the finely ground materi...

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Abstract

The invention discloses a coal-based magnetic roasting method for powdery refractory low-grade iron ore carbon-bearing pellets by a pellet shaft furnace. The method includes: subjecting refractory low-grade iron ore carbon-bearing pellets to coal-based magnetic roasting by a furnace integrating a pellet drying bed and a shaft furnace roasting body, proportionally distributing and damp-milling raw ore powder dry-ground and powered from powdery ore, and reduction pulverized coal and bentonite to obtain mixture with uniform ingredients and certain water content, performing pelletizing and screening to obtain qualified carbon-bearing pellets, drying the pellets, subjecting the dried pellets to magnetic roasting in the shaft furnace, subjecting the pellets to drying, preheating, roasting, uniform heating and cooling, directly subjecting the pellets to water quenching in water to produce qualified roasted magnetized ore. After magnetic separation of the roasted ore by the method, iron ore concentrate at 62-63% grad is obtained. Metal recovery rate and grade ratio of the iron ore concentrate obtained by the method are respectively 18-19% and 13-14% higher than those of the iron ore concentrate obtained by strong magnetic separation process.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a shaft furnace coal-based magnetization roasting method for carbon-containing pellets of powdered refractory low-grade iron ore. Background technique [0002] 1. Iron ore resource situation [0003] At present, there are many kinds of complex and refractory iron ore in my country, with huge reserves, which are extremely difficult to select, and most of the useful minerals in the ore are fine-grained to fine-grained, and need to be ground to -0.074mm (-200 mesh), accounting for about 80% In order to basically achieve monomer dissociation, conventional mechanical and physical beneficiation processes are generally used, which is difficult to utilize in an economical and efficient manner. [0004] 2. Status quo of iron ore beneficiation technology [0005] At present, the commonly used technologies for iron ore beneficiation include: wet grinding and benefici...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/02C22B1/14B03C1/015
Inventor 王明华权芳民
Owner JIUQUAN IRON & STEEL GRP