Recycling GTL catalysts—A new challenge

The Fischer Tropsch synthesis of motor fuel from natural gas on a large scale may become significant in the near future for economic and environmental reasons. This process requires solid-phase catalysts containing large amounts of cobalt (catalyst) and traces of platinum group metals or rhenium (promoter). The economic data presented in this paper shows why recycling of those metals will be mandatory. Several recycling processes will be presented along with their technical challenges, most of which can be handled by Umicore using its know how and experience in the recycling of cobalt and the precious metals.     

浅谈虹吸管在德兴铜矿4~#尾矿库回水中利用

主要着重叙述了虹吸管在德兴铜矿4#尾矿库1#斜槽及隧洞封堵施工期间为选矿厂供应回水中应用实践过程。通过虹吸管设施和应用,为1#斜槽及隧洞封堵工程的施工顺利进行,为满足选矿厂生产用水补给和稳定矿山正常的生产秩序及生产计划的完成奠定了基础,并且取得了良好的经济效益。     

Die Zerkleinerung von Metallen in Hammerreißern (Shredder)

Size Reduction of Metals in Shredders Size reduction is of cardinal importance in the recycling of scrap and waste. The choice of size reduction machines is critically dependent on the properties and bonding conditions of the components present in the waste or scrap. Shredders have become widely used for the size reduction of various kinds of scrap. Size reduction of metals in shredders requires sufficiently deformation of the pieces of material (bending to compaction), which leads to cracking. Tensile loads con combination with bending and torsion can enlarge the cracks and ultimately lead to break‐up of the pieces of metal. Reduction of the circumferential velocity of the shredding hammers will increase the energy required for the compaction preceding size reduction. Hence, shredders should be operated with maximum possible circumferential velocities.     

Comparison of ground waste glass with other supplementary cementitious materials

Finely ground glass has pozzolanic properties that make attractive its recycling as supplementary cementitious material. This paper compares the behaviour of waste glass powders of different fineness with that of natural pozzolana, coal fly ash and silica fume. Chemical analysis, compressive strength measurements and durability tests were carried out to investigate the effect of ground glass on strength and durability performances of mortars. Blended both with Portland cement and lime, ground glass improved strength, resistance to chloride penetration and resistance to sulphate attack of mortars more than natural pozzolana and similarly to fly ash. Mortars with ground glass immersed in water for seven years did not show any sign of degradation and increased their compressive strength. The ranking of ground glass with respect to the other mineral additions was not affected by fineness.     

聚乙烯装置己烷回收系统技改设计

通过对聚乙烯己烷回收系统的改造设计 ,解决了预聚合过程中预聚物干燥时所排出的进入 2 0F6 90罐再循环利用的己烷中细粉含量高的问题     

钛白废酸回收装置国产化实践

南通三圣开发了拥有自主知识产权的“钛白废酸资源化回收利用的工艺技术及装置”,并通过了江苏省科技厅科技成果鉴定。从工艺技术革新、装置水平．经济效益及能耗分析、防腐材料及设备的开发、国产化装置的实施和优越性比较等几个方面证实了该装置的技术含量已世界先进水平．充分论证了钛白废酸的综合治理、回收利用是切实可行的。     

Possible methods of recycling NdFeB-type sintered magnets using the HD/degassing process

With the rapid growth in the use of NdFeB-type magnets and with the growing environmental need to conserve both energy and raw materials, the recycling of these magnets is becoming an ever important issue. In this paper it is demonstrated that hydrogen could play a vital role in this process. Fully dense sintered NdFeB-type magnets have been subjected to the hydrogen decrepitation (HD) process. The resultant powder has been subsequently processed in one of two ways in order to produce permanent magnets. Firstly, the powder was subjected to a vacuum degassing treatment over a range of temperatures up to 1000 °C in order to produce powder that would be suitable for the production of anisotropic bonded or hot pressed magnets. Secondly, the HD-powder has been used to produce fully dense sintered magnets; in which case optimisation of the milling time, sintering temperature and time was carried out. The optimum degassing temperature for coercive powder was found to be 700 °C, giving powder with a remanence (Br) of 1350 mT (±50 mT) and an intrinsic coercivity (Hcj) of 750 kA m⁻¹ (±50 kA m⁻¹). The best sintered magnet was produced by very lightly milling the powder (30 min, roller ball mill), aligning, pressing and vacuum sintering at 1080 °C for 1 h. The magnetic properties of this magnet were: (BH)_max = 290 kJ m⁻³ (±5 kJ m⁻³), Br = 1240 mT (±50 mT) and Hcj = 830 kA m⁻¹ (±50 kA m⁻¹); representing decreases of 15%, 10% and 20%, respectively, from the properties of the initial magnet.