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A method for separating magnesium from ferronickel slag

A technology for nickel-iron slag and iron slag is applied in the field of comprehensive utilization of metallurgical waste slag, which can solve the problems of low utilization rate of nickel-iron slag, and achieve the effects of convenient and direct utilization, great social and economic benefits, and widening the scope of application.

Inactive Publication Date: 2019-10-11
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a method for separating magnesium from ferronickel slag aiming at the current technical blank of low utilization rate of ferronickel slag

Method used

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  • A method for separating magnesium from ferronickel slag

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Experimental program
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Effect test

Embodiment 1

[0039] The ferronickel slag used in this implementation is the ferronickel slag produced in the actual production process of ferronickel production enterprises, and the magnesium content in its composition is 17.9%, and the iron content is 6.47%.

[0040] The ferronickel quenching slag is heated to melting at a heating rate of 20°C / min. Then keep it warm for 60 minutes in an environment of 900°C, and then cool at a cooling rate of 300°C / min. Analysis showed a magnesium content of 36.14 wt% in the crystalline phase.

[0041] Then crush and grind the ferronickel slag to a particle size of 50 microns, then adjust the magnetic field of the high-gradient magnetic separator to 9000GS for separation, and obtain high-magnetic slag and low-magnetic slag. The low-magnetic slag is the target product, and its magnesium The content reaches 34.01%.

Embodiment 2

[0043] The ferronickel slag used in this implementation is the ferronickel slag produced in the actual production process of ferronickel production enterprises, and the magnesium content in its composition is 17.9%, and the iron content is 6.44%. The ferronickel quenching slag is heated to melting at a heating rate of 20°C / min. Then keep it warm for 60 minutes in an environment of 900°C, and then cool at a cooling rate of 300°C / min. Analysis showed a magnesium content of 36.14 wt% in the crystalline phase.

[0044] Then crush and grind the ferronickel slag to a particle size of 100 microns, then adjust the magnetic field of the high-gradient magnetic separator to 7000GS for separation, and obtain high-magnetic slag and low-magnetic slag. The low-magnetic slag is the target product, and its magnesium The content is 21.37%.

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Abstract

The invention relates to a method for separating and recycling a crystal phase from high-magnesium ferronickel slag, and belongs to the field of metallurgical slag comprehensive recovery and utilization. The method comprises the steps that ferronickel slag serves as a raw material and is subjected to magnesium enrichment treatment at first; a mixture composed of high-magnesium ferronickel slag andlow-magnesium ferronickel slag is obtained; the mixture composed of the high-magnesium ferronickel slag and the low-magnesium ferronickel slag is crushed to be 10-100 [mu]m; and magnetic separation is conducted, and the high-magnesium ferronickel slag is separated from the low-magnesium ferronickel slag, and during magnetic separation, the magnetic field intensity is controlled to be 7000-10000 gauss. The method is simple, easy to implement and low in cost, recycling of high-content magnesium oxide and silicon dioxide in the ferronickel slag is facilitated, it is possible for utilizing a large amount of ferronickel metallurgical slag, and considerable social and economic benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of metallurgical waste slag, and in particular relates to a method for separating magnesium from ferronickel slag. Background technique [0002] At present, many nickel-iron stainless steel enterprises at home and abroad adopt the world's advanced RKEF process to produce nickel-iron alloys. The annual output of stainless steel has increased significantly, and a large amount of nickel-iron water quenching slag has been produced at the same time. Due to the high MgO content of ferronickel water quenching slag, only a small part of it is currently used as a cement additive or a construction filler that partially replaces sand and gravel, and most of it has not yet been sought for better utilization. A large amount of water-quenched slag stockpiles not only takes up a lot of space, but also may have potential environmental hazards. [0003] Ferronickel slag is an industrial solid wa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/04C22B26/22
CPCC22B7/004C22B7/04C22B26/22Y02P10/20
Inventor 王万林周乐君余杰谢森林田伟光梁国燊张凯旋朱晨阳应国民张磊路程
Owner CENT SOUTH UNIV