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Comprehensive utilization method of neodymium iron boron waste acid leaching slag

A waste acid, NdFeB technology, applied in iron oxide, fibrous fillers, process efficiency improvement, etc., can solve the problems of polluting the environment, no comprehensive utilization method, occupying space, etc.

Inactive Publication Date: 2016-07-06
NANYANG ORIENTAL APPL CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no suitable comprehensive utilization method. Some enterprises either sell it as iron-making raw material or store it, which not only occupies the site, but also pollutes the environment.

Method used

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  • Comprehensive utilization method of neodymium iron boron waste acid leaching slag

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Raw material composition used: Fe 2 o 3 53.54%; REO1.00%; Co0.65%.

[0041] Mix 100kg of NdFeB waste acid leaching residue with 295kg of acid leaching solution in a neutralization reactor, control the temperature at 70°C for 180 minutes, filter after the reaction, and wash with a small amount of water to obtain 69kg of neutralization residue and 355kg of neutralization solution. The main components of the neutralizing solution are: Fe 2 (SO 4 ) 3 131.3kg; REO0.4kg; Co0.62kg;

[0042] Mix and stir 69kg of neutralized residue with 105kg of iron red post-eluate in the acid leaching reactor to form a slurry, then add 106kg of concentrated sulfuric acid with a concentration of 98%, and the reaction time is 240min at 70°C. Filtrate at ℃ and wash with a small amount of water to obtain 295kg of acid leaching solution and 27kg of wet acid leaching residue.

[0043] Add 27kg of acid leaching residue to the reslurry washing tank and add the eluate 135kg, stirred into a slu...

Embodiment 2

[0052] Raw material composition used: Fe 2 o 3 67.53%; REO0.85%;

[0053] Mix 1000kg of NdFeB waste acid leaching residue with 3410kg of acid leaching solution in a neutralization reactor, control the temperature at 100°C, and take 360min. After the reaction, filter at 90°C and wash with a small amount of water to obtain neutralization residue 600kg, neutralizing solution 3850kg. The main components of the neutralizing solution are: Fe 2 (SO 4 ) 3 1665kg; REO3.80kg;

[0054] Mix 600kg of neutralization residue with 1500kg of iron red post-eluate in the acid leaching reactor to form a slurry, then add 1560kg of concentrated sulfuric acid with a concentration of 98%, and the reaction time is 180min at 90°C. Filtrate at ℃ and wash with a small amount of water to obtain 3410kg of acid leaching solution and 250kg of wet acid leaching residue.

[0055] Add 250kg of acid leaching residue to the reslurry washing tank and add the eluate 300kg, stirred into a slurry and then fi...

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Abstract

The invention discloses a comprehensive utilization method of neodymium iron boron waste acid leaching slag. The neodymium iron boron waste acid leaching slag is mixed with neodymium iron boron waste acid leaching slag acid leaching liquid, prepared by acid leaching and separation procedures, in a neutralization reactor; neutralized slurry is filtered to recover neutralized liquid and neutralized residues; the neutralized liquid serves as a raw material for preparing iron oxide red; the neutralized residues and acid leaching residue eluating liquid, obtained in the acid leaching procedure, are mixed and added in sulfuric acid for acid leaching reaction and filtration to obtain acid leaching liquid and acid leaching residues; the acid leaching liquid is used for neutralizing ingredients; the acid leaching residues and latter eluating liquid, prepared in the oxide iron red preparation procedure, are mixed to prepare pulp; rare earth sulfate in the acid leaching residues is dissolved out by filtering and washing; and filter eluating liquid, prepared after preparation, is sent to a rare earth extracting procedure for preparing a rare earth product. The comprehensive utilization method realizes comprehensive utilization of iron, micro rare earth and cobalt resources in the neodymium iron boron waste acid leaching slag, and realizes effective separation and enrichment of the rare earth and the cobalt elements.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of industrial solid waste, and in particular relates to a comprehensive utilization method of acid leaching slag of NdFeB waste. Background technique [0002] NdFeB waste acid leaching slag is the acid leaching waste slag produced by decomposing NdFeB waste in the process of extracting neodymium from NdFeB waste, and its main component is Fe 2 o 3 , REO, Co, etc. At present, there is no suitable comprehensive utilization method, and some enterprises either sell it as iron-making raw material, or store it, which not only occupies space, but also pollutes the environment. Contents of the invention [0003] In order to comprehensively utilize the valuable resources in the acid leaching residue of NdFeB waste and eliminate environmental pollution, the present invention proposes a method for comprehensive utilization of the acid leaching residue of NdFeB waste. The comprehensive ...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B59/00C22B23/00C01G49/06C09C1/24
CPCC01G49/06C09C1/24C22B7/007C22B23/043C22B59/00Y02P10/20
Inventor 肖景波陈居玲夏娇彬
Owner NANYANG ORIENTAL APPL CHEM RES INST
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