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Preliminary Study of VB Doping for Improvement of Graphite Cathode Material

ZHANG Xiao-kang;ZHONG Hui;DAI Yan-yang
Rare Metals and Cemented Carbides | Vol., Issue 3, 2008 | pp. 31-34
VB is doped into graphite with solid-phase method. Study is made of the effect of VB dosage, roasting temperature and duration on the electrochemical property of the composite material. The following optimum technological parameters were developed as follows through orthogonal experiment： VB dosage 9%, the roasting temperature 1 200 ℃, roasting duration 3 h. The test results prove that the optimized synthesis technology is good for improvement of electrochemical property of lithium ion battery cathode material.
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Synthesis of LiFePO_4/C Anode Material for Lithium-ion Battery

CHEN Yang;ZHOU Zhen-jun;TONG Yun;ZHU Hai-xia
Rare Metals and Cemented Carbides | Vol., Issue 3, 2008 | pp. 35-37
The LiFePO4/C anode material for lithium-ion batteries was synthesized by solid-phase synthesis. The crystalline structure,grain morphology and electrochemical performance of the product were investiga-ted. The results show that the resultant LiFePO4/C has simple pure olive-type structure with uniform distribution of the gain sizes. The initial specific charge and discharge capacity of LiFePO4/C is the highestwith 115 mAh/g at the rate of 0.1C and the retained capacity is 97% after 20 cycles .
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新大粉末冶金设备制造有限公司

Rare Metals and Cemented Carbides | Vol., Issue 3, 2008 | pp. F0004-F0004
本公司是集粉末冶金设备开发、设计、制造、经营为一体的高科技企业。公司拥有各类专家和工程技术人员30多人，专门为粉末冶金生产线设计、制造、销售粉末还原设备、混合料设备、挤压成形、真空烧结等系列设备。公司是目前国内可以制造粉末冶金整条生产线（特别是硬质合金生产线）全套高精设备的企业之一。
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Preparation of Nb_2O_5 for Ceramic Capacitors

CAO Qi-lin;YAO Wei-dong
Rare Metals and Cemented Carbides | Vol., Issue 3, 2008 | pp. 43-44
Ammonia neutralization and subsequent precipitation reactions during preparing Nb2O5 for ceramic capacitors were studied. By controlling such reaction conditions as solution concentration, reaction temperature and speed and sintering temperature,Nb2O5 with an average grain size of about 0.8μm and a good dispersivity can be obtained. The ceramic capacitors made from the above Nb2O5 possess high dielectric constant, high stability and high reliability.
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The Latest Development of WC_P/Steel-based Compositesand Compound Roller

YE Jin;YOU Xian-qing;HUANG Man-ping;MA Jian-guo;LIU Bao
Rare Metals and Cemented Carbides | Vol., Issue 3, 2008 | pp. 48-53
The paper summarizes the latest development of the roller material and roller failure form, focusing on the preparation process. The existing problems and solutions are presented, based on which the ways how to improve the property of WCp/steel-based compound rollers are discussed.
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The latest Development and Prospects of Beryllium Minerals Flotation

LI Ai-min;JIANG Jin-guang;WANG Hui;FU Jian-gang
Rare Metals and Cemented Carbides | Vol., Issue 3, 2008 | pp. 58-61
The paper summarizes the latest development of flotation of commercial beryllium minerals such as beryl,phenacite, bertrandite and chrysoberyl. It is pointed out that chrysoberyl is the second most important beryllium resource next to beryl in China. The high-efficiency development and effective utilization of chrysoberyl has become a very important topic for Be resource investigation.
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The Latest Development of Pretreatment of Refractory Gold Ores

ZHANG Wen-xuan;ZHONG Hong;FU Jian-gang;WEN Zhen-qian
Rare Metals and Cemented Carbides | Vol., Issue 3, 2008 | pp. 62-66
The gold resources in China and present status of pretreatment process of various refractory gold ores are reviewed. Analysis is made of the characteristics of the pretreatment technologies such as roasting oxidization,pressure oxidization, bio-oxidization, chemical oxidization and microwave heating. It is pointed out that the microwave pretreatment, characterized by uniform heating and low energy Consumption, is a very promising pretreatment method for refractory gold ores.
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