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A dry separation process of refractory ore magnetization roasting dry grinding

A technology of magnetization roasting and refractory beneficiation, which is applied in chemical instruments and methods, solid separation, and separation of solids from solids by airflow, which can solve the problems of difficult storage, high cost, and difficult filtration.

Active Publication Date: 2019-04-26
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the problems of rotary kiln and tunnel kiln magnetized roasting ore wet separation concentrate filtration, tailings concentration, storage difficulty and high cost, the invention provides a refractory ore magnetization roasting dry grinding dry separation process

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  • A dry separation process of refractory ore magnetization roasting dry grinding

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Embodiment 1

[0018] A refractory ore magnetization roasting dry grinding dry separation process, the oxidized refractory ore used is mirror iron ore in the Huashugou mining area of ​​Jingtie Mountain in Jiuquan Iron and Steel Corporation, and the iron grade is 34%, which specifically includes the following steps:

[0019] Step A. Using a rotary kiln to magnetize and roast the above-mentioned iron ore, the roasting temperature is 750°C, and the roasting time is 40 minutes. After the roasted ore is cooled to normal temperature, it is crushed to less than 2mm. The iron ore is lost by 10%, and the grade of the roasted ore is 37.78%;

[0020] Step B. Use a spiral dry magnetic separator to perform dry pre-selection and discarding of the roasted ore broken to less than 2mm. The throwing float yield is 10%, the grade of the discarded tailings is below 7.86%, and the grade of the roasted ore after discarding is 41.10%. Use the wind classification device to classify the roasted ore after discarding, ...

Embodiment 2

[0028] A refractory ore magnetization roasting dry grinding dry separation process, the oxidized refractory ore used is mirror iron ore in Jingtieshan Heigou Mining Area of ​​Jiuquan Iron and Steel Co., Ltd., and the iron grade is 35%, which specifically includes the following steps:

[0029] Step A. Using a tunnel kiln to magnetize and roast the above-mentioned iron ore, the roasting temperature is 750°C, and the roasting time is 40 minutes. After the roasted ore is cooled to normal temperature, it is crushed to less than 2mm. The iron ore is burned by 9.5%, and the roasted ore grade is 38.67%;

[0030] Step B. Use a spiral dry magnetic separator to perform dry pre-selection of the roasted ore broken to less than 2mm and discard it. The throwing float yield is 10%, the grade of the discarded tailings is below 7.83%, and the grade of the roasted ore after discarding is 42.10%. Use the wind classification device to classify the roasted ore after discarding, and classify into two...

Embodiment 3

[0038] A refractory ore magnetization roasting dry grinding dry separation process, the oxide ore used is a refractory ore in Xinjiang, the grade is 33%, specifically including the following steps:

[0039]Step A. Using a shaft furnace to magnetize and roast the above-mentioned iron ore, the roasting temperature is 700°C, and the roasting time is 50 minutes. After the roasted ore is cooled to normal temperature, it is crushed to less than 2mm. The iron ore is lost by 8%, and the grade of the roasted ore is 35.87%;

[0040] Step B. Use a spiral dry magnetic separator to perform dry pre-selection of the roasted ore broken to less than 2mm and discard it. The throwing float yield is 9%, the grade of the discarded tailings is below 7.31%, and the grade of the roasted ore after discarding is 38.69%. Use the wind classification device to carry out particle size classification on the discarded roasted ore, and classify into two particle size ranges of -0.074mm and +0.074mm~-2mm, and t...

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Abstract

The invention relates to a refractory ore magnetizing roasting, dry grinding and dry separation process which comprises the following main process steps that a rotary kiln, a tunnel kiln, a shaft furnace and the like are adopted to conduct magnetizing roasting on refractory ore; the roasted ore is cooled to the normal temperature and crushed to be with the size fraction being -2 mm; a spiral dry-type magnetic separator is utilized to conduct dry-type pre-separation and discarding on the roasted ore, and the discarding grade is controlled to be 8% or below; after discarding is finished, the roasted ore adopts a wind power grading device for size grading, and two size fraction ranges of -0.074 mm and +0.074 mm are achieved; roasting ore powder with the size fraction being -0.074 mm is conveyed to a panel wind magnetism combination dry separator distribution device through a sealing belt, and the roasting ore powder with the size fraction being +0.074 mm is conveyed to a dry grinder through a sealing belt to be ground till all the roasting ore powder has the size fraction being -0.074 mm; and a panel wind magnetism combination dry separator is adopted for three-stage dry-type concentration, and the total metal recovery rate of iron concentrate is 85% or above.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and relates to a magnetization roasting dry grinding dry separation process of refractory ore. Background technique [0002] my country's iron ore resources are rich in lean ore and less in magnetic ore. Weak magnetic iron ore accounts for more than 70% of the total reserves. Weak magnetic iron ore can be magnetically separated after it has been magnetized and roasted to become a strong magnetic mineral. Obtain iron ore concentrates whose quality meets the requirements for sintering ingredients. The iron ore with a size of +15mm is directly magnetized and roasted in a shaft furnace, and the iron ore with a size of -15mm is magnetized and roasted in a rotary kiln or a tunnel kiln. After roasting, the iron ore powder is easy to grind. In the wet selection process, the iron concentrate produced must be filtered and dehydrated, and the tailings must be concentrated and sent to the tailings...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/02C22B1/00B07B9/02
CPCB07B9/02C22B1/00C22B1/02
Inventor 展仁礼郭忆边立国王欣雷鹏飞杏仲全
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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