Technique for producing 99% praseodymium-neodymium oxides by using Nd-Fe-B smelting slag

A technology of praseodymium neodymium oxide and neodymium iron boron, which is applied in the field of extraction of praseodymium neodymium oxide, can solve the problems of pollution, low recovery rate, low metal recovery rate, etc., and achieve simple process, high raw material utilization rate and high product purity Effect

Inactive Publication Date: 2008-06-18
什邡市虹雨化工有限公司
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Problems solved by technology

At present, waste residue and waste sludge will be produced in the process of NdFeB smelting. These waste residues and waste sludge contain a considerable amount of praseodymium and neodymium compounds. If they are not recycled, they will waste resources and pollute the environment.
The original recycling generally adopts rough processes such as washing and calcination, and its recovery rate is low and the secondary pollution is heavy, even exceeding the degree of direct waste pollution.
At present, there are also recovery processes such as double salt precipitation and alkali conversion, as well as recovery processes such as sulfuric acid dissolution, double salt precipita

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  • Technique for producing 99% praseodymium-neodymium oxides by using Nd-Fe-B smelting slag

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Embodiment Construction

[0024] Below in conjunction with specific embodiment and process flow chart, the invention is described further. Step A, acid leaching, put 1.2 cubic meters of 6mol / L hydrochloric acid in a reaction kettle with a volume of 3 cubic meters, and slowly put 800 kg of NdFeB smelting waste residue and waste magnetic mud into the hydrochloric acid for 40 minutes. In the reaction kettle, after the feeding is completed, wait for it to react for 2 hours, then add water to dilute to 1.8 cubic meters, stir for 15 minutes, and then add ammonium bicarbonate to adjust the pH value to 2;

[0025] Its chemical reaction equation is: RE 2 o 3 +6HCL=2RECL 3 +3H 2 o

[0026] In this step, the praseodymium and neodymium oxides in the refining waste slag and waste magnetic mud are dissolved by HCL into water-soluble RECL 3 , so that the praseodymium and neodymium are separated from the impurities.

[0027] Step B, ammonium bicarbonate precipitation, the temperature of the solution with a pH va...

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Abstract

The invention relates to a production process of extracting Pr-Nd oxide by utilizing NdFB to smelt waste slag and magnetic slurry. The invention is characterized in that: according to chemical characteristics of rare metal ion, the valuable elements are separated and extracted by acid leaching, ammonium bicarbonate sedimentation, selective dissolution, oxalate sedimentation, and burning procedures, so as to produce high purity Pr-Nd oxide. The invention has the advantages of high purity (reaching 99%), high utilization ratio of raw materials (reaching 98%), simple process (two dissolutions and two sedimentations, and then burning are performed to obtain high purity products), no solid waste slag for polluting environment, and being suitable for large-scale production.

Description

technical field [0001] The invention relates to a production process for extracting praseodymium and neodymium oxides from NdFeB smelting waste slag and waste magnetic mud. Background technique [0002] NdPr magnetic materials are one of the important basic materials supporting the modern electronic information industry, and are closely related to people's lives. With the popularity of communication equipment such as computers, mobile phones, and car phones, and the rapid development of energy-saving cars, the world's demand for high-performance rare earth permanent magnet materials has grown rapidly. At present, during the smelting process of NdFeB, there will be waste residues and sludges, which contain a considerable amount of praseodymium and neodymium compounds. If they are not recycled, it will not only waste resources but also pollute the environment. The original recycling generally adopts rough processes such as washing and calcination, which have a low recovery ra...

Claims

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Application Information

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IPC IPC(8): C01F17/00
Inventor 王洪志
Owner 什邡市虹雨化工有限公司
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