Title:
METHOD FOR SAFELY OXIDIZING AND ROASTING NEODYMIUM-IRON-BORON POWDER AND APPLICATION THEREOF
Document Type and Number:
WIPO Patent Application WO/2022/242185
Kind Code:
A1
Abstract:
Disclosed in the present invention are a method for safely oxidizing and roasting a neodymium-iron-boron powder and the application thereof. The method comprises: magnetizing and drying a neodymium-iron-boron powder, igniting and spontaneously combusting the dried neodymium-iron-boron powder in an ignition furnace, then cooling, smashing and sieving the spontaneously combusted neodymium-iron-boron powder, magnetizing a undersize material, and then oxidizing and roasting same to obtain a neodymium iron boron oxide. According to the present invention, three-section step-by-step roasting is performed by means of low-temperature drying, medium-temperature ignition and high-temperature oxidation, and a spontaneous combustion risk of the neodymium-iron-boron powder is controlled in a medium-temperature ignition furnace, such that management, control and isolation are facilitated; the neodymium-iron-boron powder is magnetized, such that dust rising in a roasting process can be effectively avoided and a dust combustion and explosion risk is reduced; and the magnetized neodymium-iron-boron powder is in the form of radiation and cotton-wool, which increases the contact area with air, effectively improves the drying speed and oxidation degree, and reduces the energy consumption.
Inventors:
XU JIANFENG (CN)
LI CHANGDONG (CN)
RUAN DINGSHAN (CN)
MAO LINLIN (CN)
LIAO YULONG (CN)
YANG DING (CN)
LI CHANGDONG (CN)
RUAN DINGSHAN (CN)
MAO LINLIN (CN)
LIAO YULONG (CN)
YANG DING (CN)
Application Number:
PCT/CN2021/142928
Publication Date:
November 24, 2022
Filing Date:
December 30, 2021
Export Citation:
Assignee:
GUANGDONG BRUNP RECYCLING TECHNOLOGY CO LTD (CN)
HUNAN BRUNP RECYCLING TECH CO LTD (CN)
HUNAN BRUNP VEHICLES RECYCLING CO LTD (CN)
HUNAN BRUNP RECYCLING TECH CO LTD (CN)
HUNAN BRUNP VEHICLES RECYCLING CO LTD (CN)
International Classes:
C22B1/02; C22B59/00
Foreign References:
| CN113444874A | 2021-09-28 | |||
| CN102154553A | 2011-08-17 | |||
| CN111410286A | 2020-07-14 | |||
| CN102154557A | 2011-08-17 | |||
| KR101662445B1 | 2016-10-04 | |||
| CN206666603U | 2017-11-24 |
Other References:
WANG, ZHIWEI ET AL.: "Magnetization to Improve the Reaction of Iron Powder with Water Vapor Experiment", ZHONGXUESHENG SHULIHUA (JIAO YU XUE JIAOYAN BAN) = MATHEMATICS, PHYSICS AND CHEMISTRY FOR SECONDARY SCHOOL STUDENTS (TEACHING AND LEARNING), CN, no. 1, 31 January 2021 (2021-01-31), CN, pages 86 - 87, XP009541355, ISSN: 1003-2215
GAO, XIGUI ET AL.: "Study on Rare Earth Element Recovery from Cerium Rich NdFeB Waste Material", CHINA RESOURCES COMPREHENSIVE UTILIZATION, vol. 37, no. 02, 28 February 2019 (2019-02-28), XP009541290, ISSN: 1008-9500
GAO, XIGUI ET AL.: "Study on Rare Earth Element Recovery from Cerium Rich NdFeB Waste Material", CHINA RESOURCES COMPREHENSIVE UTILIZATION, vol. 37, no. 02, 28 February 2019 (2019-02-28), XP009541290, ISSN: 1008-9500
Attorney, Agent or Firm:
ADVANCE CHINA IP LAW OFFICE (CN)
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