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Flash reduction comprehensive recovery method of neodymium iron boron waste acid leaching residue

A waste acid and neodymium-iron-boron technology, which is applied in the direction of improving process efficiency and reducing gas emissions, can solve the problems of no suitable comprehensive utilization method for iron-boron waste acid leaching residue, high equipment requirements, environmental pollution, etc., and achieve good promotion Application value, accurate atmosphere control, environment-friendly effect

Active Publication Date: 2019-03-08
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] There is no suitable comprehensive utilization method for NdFeB waste acid leaching slag. Most enterprises stockpile it, causing environmental pollution, and a few enterprises sell it as iron-making raw materials.
The patent (application number: 201610246932.3) announced "a method for comprehensive utilization of acid leaching slag from NdFeB waste". high equipment requirements

Method used

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  • Flash reduction comprehensive recovery method of neodymium iron boron waste acid leaching residue
  • Flash reduction comprehensive recovery method of neodymium iron boron waste acid leaching residue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The powdery NdFeB waste acid leaching residue with a particle size of 100 mesh is sprayed into a reaction tower (2) with a height of 3.5 meters and a temperature of 1200 ° C through a nozzle (1) together with hydrogen, and the material is in a highly dispersed floating state. The upper end of the reaction tower falls to the lower end. During this process, the reaction atmosphere is controlled so that the oxygen partial pressure is 10 -16 Atm, 45.1% of the iron oxides in the material were reduced to metallic iron, 54.4% were reduced to ferric oxide, while the rare earth oxides in the material were not reduced. The reduction products fall into the collector (3) below the reaction tower, and after being discharged from the outlet (4), iron-rich phase and rare earth-rich phase are obtained by magnetic separation. The reduced flue gas is discharged through the flue (5) at the upper end of the collector (3), and is emptied after secondary combustion, waste heat recovery and d...

Embodiment 2

[0019] The powdery NdFeB waste acid leaching residue with a particle size of 200 mesh is sprayed together with hydrogen into a reaction tower (2) with a height of 5.5 meters and a temperature of 1300 °C through a nozzle (1). The material is in a highly dispersed floating state from The upper end of the reaction tower falls to the lower end. During this process, the reaction atmosphere is controlled so that the oxygen partial pressure is 10 -18 Atm, 60.5% of the iron oxides in the material were reduced to metallic iron, 39.1% were reduced to ferric oxide, while the rare earth oxides in the material were not reduced. The reduction products fall into the collector (3) below the reaction tower, and after being discharged from the outlet (4), iron-rich phase and rare earth-rich phase are obtained by magnetic separation. The reduced flue gas is discharged through the flue (5) at the upper end of the collector (3), and is emptied after secondary combustion, waste heat recovery and du...

Embodiment 3

[0021] The powdery NdFeB waste acid leaching residue with a particle size of 300 mesh is sprayed together with hydrogen into a reaction tower (2) with a height of 8.5 meters and a temperature of 1450 °C through a nozzle (1). The material is in a highly dispersed floating state from The upper end of the reaction tower falls to the lower end. During this process, the reaction atmosphere is controlled so that the oxygen partial pressure is 10 -20 Atm, 80.5% of the iron oxides in the material were reduced to metallic iron, 19.3% were reduced to ferric oxide, while the rare earth oxides in the material were not reduced. The reduction products fall into the collector (3) below the reaction tower, and after being discharged from the outlet (4), iron-rich phase and rare earth-rich phase are obtained by magnetic separation. The reduced flue gas is discharged through the flue (5) at the upper end of the collector (3), and is emptied after secondary combustion, waste heat recovery and du...

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Abstract

The invention disclosed a flash reduction comprehensive recovery method of neodymium iron boron waste acid leaching residue. The flash reduction comprehensive recovery method includes the steps that neodymium iron boron waste acid leaching residue is dried and then and sprayed into a high-temperature vertical reaction tower space together with reducing gas through a nozzle, the reduction atmosphere is controlled, iron oxide in materials is reduced to metallic iron or ferroferric oxide, and rare earth oxide in the materials is not reduced; and after reduction products are subjected to magneticseparation, an iron-rich phase and a rare earth-rich phase are obtained correspondingly. According to the flash reduction comprehensive recovery method of the neodymium iron boron waste acid leachingresidue, efficient enrichment and separation of rare earth and iron in the neodymium iron boron waste acid leaching residue are realized, the defect that traditional neodymium iron boron waste acid leaching residue is difficult to recover comprehensively is overcome, and good economic and environment-friendly benefits are achieved.

Description

technical field [0001] The invention relates to a comprehensive recovery method for flash reduction of NdFeB waste acid leaching slag, which belongs 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 the waste will be generated. 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 waste is mainly treated by hydrochloric acid excellent solution method. First, the NdFeB is oxidized and roasted in a rotary kiln, and the rare earth and iron are oxidized into RE as much as possible. 2 o 3 and F...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B59/00C21B13/00
CPCC21B13/0073C22B7/001C22B59/00Y02P10/143Y02P10/20
Inventor 汪金良彭如振
Owner JIANGXI UNIV OF SCI & TECH
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