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Formation of AlN from secondary Al resources

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Journal of Materials Science & Technology 2006年第5期22卷 621-624页

作者： M.Bahgat M.Radwan F.E.Farghaly Central Metallurgical Research and Development Institute (CMRDI) P.O.Box 87 Helwan Cairo 11421 Egypt

Synthesis of AlN by NH4Cl-assisted direct nitridation of secondary Al resources was studied. Aluminum alloy scrap contained Mg and Zn element was used. Milled Al scrap （-1 mm） was mixed with NH4Cl and heated at 1000℃ for 1 h in presence of 1 L/min N2 flow gas. The nitrided product was evaluated by X-ray diffraction semi-quantitative analysis and scanning electron microscopy （SEM）. Aluminium nitride of 90.5% concentration was obtained with a hexagonal crystalline form. AlN is mostly formed in nano-whisker morphology （50～150 nm） which is homogenously distributed.

关键词： AlN Direct nitridation Nanowhisker secondary resources

Research on Experimental and Application for the High Efficient Enrichment of the Low-grade Precious Metal Materials

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贵金属 2012年第A1期33卷 11-17页

作者： FAN Xingxiang FU Guangqiang DONG Haigang WU Yuedong LIU Yang ZHAO Jiachun WU Xiaofeng LI Bojie TONG Weifeng State key Laboratory of Advanced Technology of Comprehensive Utilization of Platinum Metals Kunming Institute of Precious MetalsKunming 650106China

On the basis of reviewing the progress in the high efficient enrichment from secondary resources of low grade precious metals at home and abroad, a process route of the high efficient enrichment precious metals from secondary resources of low-grade metals by adding iron oxide as the trapping agent, reducing agent, additive, mixing uniformly and grinding, pelletizing, reduction, grinding and separation, and selectively acid leaching iron has been put forward in this paper. The experiments of reduction, grinding and separation, and selectively acid leaching iron were carried out mainly. Under the decided experiment parameters and conditions, iron generated during the reduction can trap precious metals during reduction, high active alloy powders were obtained from the reduced products by grinding and separation, the concentration of precious metals was obtained by acid leaching high active alloy powders. The better enrichment effect was obtained by adopting the technical route of processing. Other low grade noble metal materials and enrichment ratio of precious metals from the materials to acid products was high through acid leaching. This process has the advantages of simple process, environmental-friendly, strong adaptability of raw materials, high concentration ratio, which was regarded as a kind of the general efficient enrichment technology of low grade precious metal materials.

关键词： low-grade precious metals secondary resources the high efficient enrichment reduction grinding and separation acid leaching

The practice of using LT dust and BOF slag as hot metal dephosphorizing fluxes at Baosteel

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Baosteel Technical Research 2007年第1期1卷 27-31页

作者： Bing Xu Zhaoda Wang Jianyong Ding Baosteel Comprehensive Development Co. Shanghai 201900 China

In order to meet the requirements for environmental protection and achieve sustainable development for the steel industry, Baosteel＇ s secondary resources should be utilized in production. Hot metal dephosphorizing factors are analyzed and the practice of a dephosphorizing agent for molten iron pretreatment with LT dust and BOF slag is introduced. Experimental results show that LT dust and BOF slag can be substituted for traditional raw materials, such as sinter and quicklime, etc in molten iron dephosphorization. The proper addition of LT dust or BOF slag and the proper control over basic agents, oxidizing agents and fluxes can achieve the same effect as traditional dephosphorizing agents. BaO can reduce the activity of P2O5 and form stable dephosphorizing products. Using a BaO dephosphorizing agent as a kind of harmless dephosphorizing agent will be one of the trends of molten iron dephosphorization.

关键词： secondary resources LT dust BOF slag dephosphorizing agent BaO dephosphorizing agent