Neodymium, iron and boron waste recycling process with approximately zero wastewater discharge

A technology of waste recycling and neodymium iron boron, applied in the direction of process efficiency improvement, etc., can solve the problems of low recovery rate of heavy rare earths, secondary pollution of the environment, high cost, etc., and achieve no environmental pollution, significant economic benefits, and low production costs Effect

Inactive Publication Date: 2013-02-06
XINFENG BAOGANG XINLI RARE EARTH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, some rare earths have been recovered by double salt precipitation, alkali conversion and other processes, but the recovery rate of heavy rare earths is low: others have used sulfuric acid dissolution, double salt precipitation rare earths, alkali conversion, hydrochloric acid dissolution, extraction and separation to...

Method used

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  • Neodymium, iron and boron waste recycling process with approximately zero wastewater discharge
  • Neodymium, iron and boron waste recycling process with approximately zero wastewater discharge

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Finely pulverize 1OOOKG NdFeB waste into 300-mesh powder, oxidize and burn at 550°C for 150 minutes, put it into the reaction tank, add water 15OOKG and 500KG hydrochloric acid, beat and heat to make the reactor temperature reach 100°C, Stir the reaction for 5 hours, cool to 25°C and filter to separate solid and liquid to obtain solid X and liquid A. Add liquid A to hydrogen peroxide 20KG ammonium bicarbonate 100KG, stir at 90°C for 35 minutes to neutralize and remove impurities, then filter to obtain solid Y and liquid B. The solid Y returns to the roasting process and repeats the above steps; the liquid B undergoes the separation of 40 grades of neodymium and terbium and 70 grades of terbium and dysprosium in the PS07-sulfonated kerosene-hydrochloric acid system to obtain neodymium chloride, terbium chloride, and dysprosium chloride respectively. solution, and then precipitate and burn separately to obtain neodymium oxide, terbium oxide, and dysprosium oxide products ...

Embodiment 2

[0023] Finely pulverize 1OOOKG NdFeB waste into 200-mesh powder, oxidize and burn at 650°C for 100 minutes, put it into the reaction tank, add 800KG water and 300KG oxalic acid, beat and heat to make the reactor temperature reach Stir and react at 100°C for 7 hours, cool to 25°C and filter to separate solid and liquid to obtain solid X and liquid A. Add liquid A to 3KG of quicklime, 60KG of sodium chlorate, stir at 90°C for 45 minutes to neutralize and remove impurities, and then filter to obtain solid Y and liquid B. The solid Y returns to the roasting process and repeats the above steps; the liquid B undergoes the separation of 40 grades of neodymium and terbium and 70 grades of terbium and dysprosium in the P507-sulfonated kerosene-hydrochloric acid system to obtain neodymium chloride, terbium chloride, and dysprosium chloride respectively. solution, and then precipitate and burn separately to obtain neodymium oxide, terbium oxide, and dysprosium oxide products that meet th...

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Abstract

The invention discloses a neodymium, iron and boron waste recycling process with approximately zero wastewater discharge. The method is characterized in that recycling and separating for neodymium, terbium, dysprosium and cobalt in neodymium, iron and boron waste are researched, means such as fine grinding and crushing for the waste, oxidizing roasting, prior dissolution in hydrochloric acid, neutralization and impurity removal, double-salt iron settling and extraction separation are selected according to chemical properties of elements contained in the waste, valuable elements in the neodymium, iron and boron waste are successfully extracted, and neodymium oxide, terbium oxide, dysprosium oxide and cobalt oxide which are high in purity are obtained. The neodymium, iron and boron waste recycling process is simple, the production cost is low, an obvious economical benefit is realized, environmental pollution is prevented, and the process is applicable to industrial continuous production. Besides, the extraction rates of manufactured neodymium oxide, terbium oxide, dysprosium oxide and cobalt oxide products are maximized, and quality indexes of the manufactured neodymium oxide, terbium oxide, dysprosium oxide and cobalt oxide products meet industrial standards or customer standards.

Description

technical field [0001] The invention relates to a NdFeB waste recovery process close to zero discharge of waste water. Background technique [0002] NdFeB is a kind of permanent magnet material with superior performance, which is widely used in various fields. Due to the factors of production process, about 20% of waste will be generated during production and use. NdFeB materials contain about 30% of rare earth elements (including about 90% of neodymium, and the rest are terbium, dysprosium, etc.), and some NdFeB materials contain another 2% ~ 3% cobalt element. The recycling of NdFeB materials not only makes reasonable use of resources, but also reduces environmental pollution. At present, some rare earths have been recovered by double salt precipitation, alkali conversion and other processes, but the recovery rate of heavy rare earths is low: others have used sulfuric acid dissolution, double salt precipitation rare earths, alkali conversion, hydrochloric acid dissolutio...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B59/00
CPCY02P10/20
Inventor 张忠
Owner XINFENG BAOGANG XINLI RARE EARTH
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