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Method for flash oxygen-enriched roasting of neodymium iron boron waste

An oxygen-enriched roasting and neodymium-iron-boron technology, which is applied in the direction of improving process efficiency, can solve the problems of large external heat dissipation area, slow reaction rate, and large volume, and achieve reduced energy consumption, easy atmosphere, and good sealing of the furnace body Effect

Inactive Publication Date: 2019-03-22
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the slow oxidation reaction rate of the rotary kiln, it often takes 4-8 hours to achieve a high oxidation rate
In addition, due to the use of two-stage rotary kiln, it has a large volume, occupies a large area, and has a large external heat dissipation area. At the same time, there is a heat-cold alternating link, which results in high energy consumption.

Method used

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  • Method for flash oxygen-enriched roasting of neodymium iron boron waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Spray the powdery NdFeB waste with a particle size of 100 mesh and oxygen-enriched air with an oxygen mass percentage concentration of 40% into a reaction tower (2) with a height of 2.5 meters and a temperature of 800 °C through a nozzle (1). In a highly dispersed floating state, it falls from the upper end of the reaction tower to the lower end. During this process, the iron and rare earth in the material are rapidly oxidized by oxygen-enriched air. The oxidation rate of iron in the waste is 99.41%, and the oxidation rate of rare earth is 99.82%. Oxidation products fall into the collector (3) below the reaction tower, and the flue gas enters the cyclone dust collector (4) through the upper outlet of the collector (3) to collect dust, and the dust obtained falls into the collector (5). The upper end of the dust collector is sucked into the chimney (6) by the induced draft fan (7) and then emptied.

Embodiment 2

[0015] Spray the powdery NdFeB waste with a particle size of 200 mesh and oxygen-enriched air with an oxygen mass percentage concentration of 30% into a reaction tower (2) with a height of 3.5 meters and a temperature of 1000 °C through a nozzle (1). In a highly dispersed floating state, it falls from the upper end of the reaction tower to the lower end. During this process, the iron and rare earth in the material are rapidly oxidized by oxygen-enriched air. The oxidation rate of iron in the waste is 99.85%, and the oxidation rate of rare earth is 99.94%. Oxidation products fall into the collector (3) below the reaction tower, and the flue gas enters the cyclone dust collector (4) through the upper outlet of the collector (3) to collect dust, and the dust obtained falls into the collector (5). The upper end of the dust collector is sucked into the chimney (6) by the induced draft fan (7) and then emptied.

Embodiment 3

[0017] Spray the powdery NdFeB waste with a particle size of 300 mesh and oxygen-enriched air with an oxygen mass percentage concentration of 50% into a reaction tower (2) with a height of 2.5 meters and a temperature of 900 °C through a nozzle (1). In a highly dispersed floating state, it falls from the upper end of the reaction tower to the lower end. During this process, the iron and rare earth in the material are rapidly oxidized by the oxygen-enriched air. The oxidation rate of iron in the waste is 99.75%, and the oxidation rate of rare earth is 99.91%. Oxidation products fall into the collector (3) below the reaction tower, and the flue gas enters the cyclone dust collector (4) through the upper outlet of the collector (3) to collect dust, and the dust obtained falls into the collector (5). The upper end of the dust collector is sucked into the chimney (6) by the induced draft fan (7) and then emptied.

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Abstract

The invention discloses a method for flash oxygen-enriched roasting of neodymium iron boron waste. The method comprises the steps that the neodymium iron boron waste and oxygen-rich air are sprayed into a high-temperature reaction tower space together through a dispersion nozzle, so that the neodymium iron boron oil sludge waste is highly dispersed, in the process of dropping from the upper end ofa reaction tower to the lower end of the reaction tower, oil in materials fully burn, rare earth and iron are rapidly and fully oxidized by the oxygen-rich air, products float down into a collector below the reaction tower, and flue gas is subjected to dust collection and then emptied. According to the method, through flash oxygen-enriched roasting, reaction kinetic conditions are greatly optimized, the oil in the waste can fully burn, meanwhile, the iron and the rare earth in the waste are quickly and fully oxidized, the defects that the rotary kiln roasting reaction is slow, the process islong, energy consumption is high, and pollution is large are overcome, and the method has the advantages of quick reaction, short process, low energy consumption, environment friendliness and the like.

Description

technical field [0001] The invention relates to a method for flash oxygen-enriched roasting of NdFeB waste, belonging to the technical field of rare earth metallurgy. Background technique [0002] NdFeB is a magnetic material. As the latest achievement in the development of rare earth permanent magnet materials, it is known as the "Magnetic King" because of its excellent magnetic properties and is widely used in various fields. In the production process of NdFeB magnetic materials, about 20-25% of waste will be generated, most of which are NdFeB sludge waste. These scraps contain about 60% iron and about 30% rare earth elements. The recycling of NdFeB waste not only rationally utilizes resources, but also reduces environmental pollution. [0003] At present, NdFeB oil sludge waste is often roasted in a two-stage rotary kiln, and then leached-extracted-precipitated-burned to recover the rare earths. The purpose of the first stage of rotary kiln roasting is to remove the oi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B7/00C22B59/00
CPCC22B1/02C22B7/001C22B59/00Y02P10/20
Inventor 汪金良彭如振刘兴润
Owner JIANGXI UNIV OF SCI & TECH
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