Title:
PREPARATION METHOD FOR ANNEALING SEPARATING AGENT, ANNEALING SEPARATING AGENT, AND DIRECTIONAL ELECTROMAGNETIC STEEL PLATE
Document Type and Number:
WIPO Patent Application WO/2022/262144
Kind Code:
A1
Abstract:
The present invention provides a preparation method for an annealing separating agent, an annealing separating agent, and a directional electromagnetic steel plate. The annealing separating agent obtained with the method is high in purity, excellent in dispersibility and adhesion strength, and capable of forming a uniform and dense forsterite layer on the surface of the directional electromagnetic steel plate. The preparation method for an annealing separating agent comprises: process step (1): mixing and reacting magnesium oxide and an ammonium salt solution to prepare a magnesium salt solution and ammonia, and then reacting the refined magnesium salt solution with ammonia to obtain magnesium hydroxide; process step (2): curing a part of the resulting magnesium hydroxide at a high temperature of 155-230°C, and curing the other part of the resulting magnesium hydroxide at a low temperature of 10-100°C; and process step (3): mixing and sintering the magnesium hydroxide cured under said conditions to obtain magnesium oxide for the annealing separating agent.
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Inventors:
WANG XINGDONG (JP)
Application Number:
PCT/CN2021/120926
Publication Date:
December 22, 2022
Filing Date:
September 27, 2021
Export Citation:
Assignee:
KYOWA CHEM IND CO LTD (JP)
KISUMA DANDONG ADVANCED MAT TECH CO LTD (CN)
KISUMA DANDONG ADVANCED MAT TECH CO LTD (CN)
International Classes:
C21D8/12; C01F5/02; C21D1/26
Foreign References:
| CN113388725A | 2021-09-14 | |||
| CN111302366A | 2020-06-19 | |||
| JP2019173173A | 2019-10-10 | |||
| CN111186850A | 2020-05-22 | |||
| CN108977638A | 2018-12-11 | |||
| CN102417196A | 2012-04-18 | |||
| CN107758706A | 2018-03-06 | |||
| JP2019173172A | 2019-10-10 |
Attorney, Agent or Firm:
CCPIT PATENT AND TRADEMARK LAW OFFICE (CN)
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