# Nitric acid technology for processing magnetic production waste

https://mdr.nims.go.jp/datasets/c623a42e-bd84-490a-80df-76535be8562f

## File

- [REPM2025_P2-34_Kirillov.pdf](https://mdr.nims.go.jp/filesets/909dfebf-30be-4df1-8829-68c4171eaa20/download) ([Detail](https://mdr.nims.go.jp/filesets/909dfebf-30be-4df1-8829-68c4171eaa20.md))

## Id

c623a42e-bd84-490a-80df-76535be8562f

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-08-13T08:50:09.115423Z

## Updated at

2025-08-20T03:31:08.267412Z

## Published at

2025-08-20T03:19:29.134480Z

## Doi

https://doi.org/10.48505/nims.5648

## First published url



## Date published



## Recorded date published



## Resource type

conference_poster

## Manuscript type

na

## Collection

- id: d28f086a-61aa-4bc7-bcae-5a1078cbc6c7
  identifier: https://mdr.nims.go.jp/pid/d28f086a-61aa-4bc7-bcae-5a1078cbc6c7
  title: The 28th International Workshop on Rare Earth and Future Permanent Magnets
    and Their Applications (REPM2025)

## Title

- title: Nitric acid technology for processing magnetic production waste
  title_type: original
  lang: en

## Description

- description: "UrFU is developing a technology for recycling waste from the production
    of permanent magnets based on the use of nitric acid solutions. The choice of
    the scheme is dictated by the possible placement of the future site at an existing
    production facility, where nitric acid is already used in the technological process,
    and there is all the necessary infrastructure for the placement of such media,
    their regeneration and disposal.In order to minimize the environmental impact
    and prevent the formation of additional secondary waste at the primary stage of
    processing part of the products - grinding waste, it is proposed to use a unit
    for the regeneration of solvents and cooling liquids. Regeneration of these products
    will be carried out at a distillation-type unit. Boiling of the contaminated solvent
    will occur in a tank with a shell and a mixing device filled with diathermic oil,
    which will be heated by an electric resistor. The resulting vapors will pass through
    a condenser cooled by water, passing into the liquid phase. The solvent purified
    in this way will be collected in appropriate tanks and subjected to subsequent
    separation/use. The unit for nitric acid dissolution of waste from the production
    of permanent magnets implements the principle of continuous selective transfer
    of iron from the leaching solution to the oxide phase.\r\nIn order to eliminate
    additional costs for the disposal/placement of the leaching solution after extracting
    the REE concentrate and iron concentrate from it, a nitric acid regeneration unit
    is proposed.\r\nThe operation of this unit will allow for the simultaneous production
    of crystalline boric acid with a yield of at least 70%. The still bottoms formed
    in the nitric acid regeneration unit contain about 1% free nitric acid, as well
    as nitrates of alkali, alkaline earth and nonferrous metals with a content of
    about 1%. It is advisable to process or place this still bottoms at the facilities
    of the existing enterprise.Direct costs for nitric acid regeneration will be determined
    by electricity costs and will be about 300 kW/hour. The cost of electricity costs
    will be 10% of the cost of nitric acid. Thus, the use of a nitric acid regeneration
    unit in the implementation of this process seems to be the only alternative. Based
    on the conducted studies, it was established that the current level of technology
    for processing spent magnets and magnetic production waste, including \"dry\"
    and \"water\" technologies, is not always applicable in industrial production
    of REE. It is necessary to develop new technological approaches that, on the one
    hand, would be economically justified, and on the other, meet the requirements
    for reducing the environmental burden."
  description_type: abstract
  lang: en

## Creator

- name: Evgenii Kirillov
  role: author
  organization: UrFU, Russia
- name: Sergey Kirillov
  role: author
  organization: UrFU, Russia
- name: Grigory Bunkov
  role: author
  organization: UrFU, Russia
- name: Denis Smyshlyaev
  role: author
  organization: UrFU, Russia
- name: Aslanbek Taukin
  role: author
  organization: UrFU, Russia

## Contact agent



## Publisher

organization: National Institute for Materials Science (NIMS)

## Managing organization



## Keyword

- subject: REPM2025
  schema: not_defined
- subject: magnets
  schema: not_defined
- subject: recycling
  schema: not_defined
- subject: nitric acid
  schema: not_defined
- subject: leaching
  schema: not_defined
- subject: rare earth elements
  schema: not_defined

## Rights

- identifier: https://creativecommons.org/licenses/by/4.0/

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## Data origin

- data_origin_type: other

## Embargo



## Journal



## Conference

name: REPM2025
start_date: 2025-07-27
end_date: 2025-07-31
identifier: https://www.nims.go.jp/mmu/repm2025/

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## Fileset

- id: 909dfebf-30be-4df1-8829-68c4171eaa20
  filename: REPM2025_P2-34_Kirillov.pdf
  content_type: application/pdf
  size: 286058
  md5: 055137bf56b388ec6ce07f487e8ca528

## Thumbnail

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filename: REPM2025_P2-34_Kirillov.pdf