Pei H.,Nanchang University |
Zhu W.,Nanchang University |
Zhou X.,Nanchang University |
Zhang S.,Gansu Rare Earth New Material Ltd Liability Company |
And 2 more authors.
Zhongguo Xitu Xuebao/Journal of the Chinese Rare Earth Society | Year: 2015
Yttrium aluminum ammonium carbonate precursors (YAACP) which could transfer to pure YAG nano powders at low calcining temperature were prepared by co-precipitation method using yttrium nitrate and aluminum nitrate as raw materials and ammonium bicarbonate as precipitant. The composition and filtration performance of YAACP that prepared under different conditions and the phase purity as well as particle size of YAG powers calcined at different temperatures were characterized by IR, XRD and SEM with respecting to the effect of synthesis conditions such as feeding method, temperature, aging and stirring time etc on the filtrating performance and particle surface zeta potential. The results showed that amorphous YAACP easy to filter could be prepared by reverse precipitation method, i. e., adding metal nitrate solution to ammonium bicarbonate solution. The temperature to obtain pure YAG phase by calcining amorphous YAACP was 200 ℃ lower than that by calcining crystalline YAACP. And obtained products calcined at 1200 ℃ were well dispersed and uniformly distributed spherical particles with size around at 60 nm in diameter. Therefore, a simple and effective method to get precursor easy to filter and form pure YAG material at relatively lower temperature was provided. © 2015, Chinese Rare Earth Society. All right reserved.
Zhang S.-H.,Lanzhou University |
Zhang S.-H.,Gansu Rare Earth New Material Ltd Liability Company |
Zhou M.-J.,Lanzhou University |
Yu H.-Q.,Gansu Rare Earth New Material Ltd Liability Company |
And 4 more authors.
Faguang Xuebao/Chinese Journal of Luminescence | Year: 2013
The lamp used green (Ce0.67, Tb0.33) MgAl11O19 phosphor was synthesized by the flux method using different fluxes, and the luminescent properties of obtained samples were investigated in details. The influence of single flux and multi-fluxes on the brightness and morphology of particles was also studied. It is found that the optimal components of the multi-fluxes is 0.2%H3BO3+2.0%Li2CO3 + 2.0%AlF3 (mass fraction). The particles of optimal (Ce0.67, Tb0.33) MgAl11O19 sample have regular and uniform morphology, and the rate of brightness of this sample to present commercial (Ce0.67, Tb0.33) MgAl11O19 phosphor is about 103:100.
Zhu J.,Xi'an University of Architecture and Technology |
Wang N.,Xi'an University of Architecture and Technology |
Yang W.,Gansu Rare Earth New Material Ltd Liability Company |
Miao G.,Gansu Rare Earth New Material Ltd Liability Company |
Liu M.,Xi'an University of Architecture and Technology
Xiyou Jinshu/Chinese Journal of Rare Metals | Year: 2011
Rare-earth hydrogen storage alloys were used as the main cathode materials of MH-Ni batteries with the advantage of high capacity, large power charge-discharge, long cycle life and non-pollution. Many great achievements were made in research and application of rare-earth hydrogen storage alloys in the past several years. Combined with related research results at home and abroad in recent years, the factors affecting the hydrogen storage alloys performance, such as preparation process, composition, granularity, heat treatment and surface treatment process, were reviewed respectively. However, compared with the world advanced level, there was still a great distance in the performance of rare-earth hydrogen storage alloys in China. So it was necessary to develop new technology, to accelerate technological innovation, to optimize alloy composition, to reduce production cost, and to improve alloy high-rate discharge performance and so on.
Li X.-D.,Gansu Rare Earth New Material Ltd liability Company |
Lei S.-T.,Gansu Rare Earth New Material Ltd liability Company |
Li S.-S.,Gansu Rare Earth New Material Ltd liability Company |
Zhang G.-Q.,Gansu Rare Earth New Material Ltd liability Company
Chinese Rare Earths | Year: 2015
This paper studied the roasting process of rare earth ore mixture from Baotou and Sichuan. Effects of roasting temperature, roasting time, ratio of ore to acid and ratio of Sichuan RE ore to Baotou RE ore on rare earth recovery were investigated. The optimum technical parameters were determined as roasting temperature 350℃, roasting time 125 min, ratio of mixed RE ore to concentrated H2SO4 1:20 and ratio of Sichuan RE ore to Baotou RE ore 3:1 by orthogonal test, and rare earth recovery is higher than 96%. The effect levels of these factors on REO leaching rate successivey were roasting temperature, ratio of Sichuan RE ore to Baotou RE ore, roasting time and ratio of mixed RE ore to H2SO4. The process has good reproducibility. Contents of REO, PO4 -, Fe2O3 and ThO2 in leaching solution were 34 g/L, 0.0038 g/L, 0.015 g/L and <0.001 g/L, respectively. ©, 5015, Editorial Office of Chinese Rare Earths. All right reserved.