Baotou Environmental Supervision Station

Baotou, China

Baotou Environmental Supervision Station

Baotou, China
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Yu Y.-H.,Baotou Research Institute of Rare Earths | Xu T.,Baotou Research Institute of Rare Earths | Xu T.,Wuhan University of Technology | Liu X.-J.,Baotou Research Institute of Rare Earths | And 2 more authors.
Chinese Rare Earths | Year: 2015

This paper established a new method for determination of total content of rare earth in waste rare earth polishing powder by modifying method of decompositing sample based on national standard of determination of REO in rare earth concentrate. The measurement range is 10% ~ 95% and the RSD is 0.17% ~ 0.28%. Suitable acid and amount of usage were selected and the amount of Si, Fe, Al experiments were done. The results of precision test and comparision of decompositing sample methods show that the method is simple, accurate, good stability and suitable to the requirement of technological process for waste rare earth polishing powder. ©, 2015, Editorial Office of Chinese Rare Earths. All right reserved.


Liu X.-J.,Baotou Research Institute of Rare Earths | Hao Q.,Baotou Research Institute of Rare Earths | Jin W.-L.,Baotou Research Institute of Rare Earths | Na R.-S.,Baotou Environmental Supervision Station
Chinese Rare Earths | Year: 2014

A new analytical method used to determine total rare earths in NdFeB waste by ICP-AES is reported in this paper. The samples were digested with hydrochloric acid. The background interference was eliminated by off-peak background correction method. The total rare earths was determined by standard curve method. The measurement range is 5% to 50%. The RSD is less than 1%. The recovery is 94% to 110%. The results were in agreement with control values. The method is simple, rapid and accurate to meet the analytical requirement for determination of total rare earths in NdFeB waste.


Liu X.-J.,Baotou Research Institute of Rare Earths | Xu T.,Baotou Research Institute of Rare Earths | Xu T.,Wuhan University of Technology | Yu Y.-H.,Baotou Research Institute of Rare Earths | And 2 more authors.
Chinese Rare Earths | Year: 2013

Non-rare earth impurities in NdFeB waste were determined by ICP-AES method. The matrix spectral interference was eliminated by matrix matching. Interference experiments were done within coexisting elements to choose the best analysis wavelength. The amount of matrix experiments were done to choose the analysis wavelength less influenced by the amount of matrix. The analysis wavelength has broader applicability when the amount of matrix changed greatly. The measurement range is 0.0050-0.50% for Cr, Mg, Mn, 0.010-1.00% for Si, 0.020-0.50% for Ga, 0.020-5.00% for Co, 0.050-1.00 for B, Cu and 0.10-1.00% for Al, Ti. The RSD is 0.81% to 7.1%. The results were in agreetment with control values compared with other methods. The method is simple, rapid and accurate to meet the analytical requirement for determination of non-rare earth impurities in NdFeB waste.

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