从含锗多金属物料中回收锗的工艺研究

先用盐酸-氟化铵-高锰酸钾对含锗多金属物料逐级进行预处理,再经盐酸蒸馏分离工艺得到四氯化锗,最终锗回收率达到95.20%左右。通过试验对预处理盐酸、氟化铵、高锰酸钾的用量以及蒸馏盐酸的用量等因素进行了系统研究,在此基础上提出了优化的工艺条件;与常规的湿法工艺即硫酸浸出-丹宁(栲胶)沉淀-锗精矿-盐酸蒸馏提锗法相比,本工艺锗回收率提高21%以上。

含铅多金属物料电积提铅的研究

介绍了一种含铅多金属物料电积提铅的工艺,用湿法处理含铅多金属物料。通过硫酸高压脱锌脱铜,并使部分铅转换为硫酸铅,后经碳酸化处理脱硫,硅氟酸浸出制得硅氟酸铅电解液,通过试验确定最优硫酸浓度、碳酸钠用量、硅氟酸浓度。电积提铅阶段,通过考察添加剂的用量、电解液浓度、极间距、电流电压等因数的影响,获得较佳的铅电沉积工艺。

富氧侧吹处理含铅多金属物料的生产实践

介绍了富氧侧吹氧化、富氧侧吹还原及烟化炉烟化处理含铅多金属物料的冶炼工艺及生产实践,脱硫率略高于设计值,煤率低于设计值。

多金属复杂物料提取高纯氧化碲的生产实践

系统介绍了利用有色冶炼二次资源——多金属物料铜渣提取高纯氧化碲的工艺,明确了经实践验证的工艺流程与操作条件。生产实践证明,采用磨料-常温氧化浸出-二氧化硫还原-催化氧化的工艺,可将碲提纯为含碲达79.2%以上的高纯氧化碲,银、铜、铋等金属可以有效分离,渣料中的微量金及其它贵金属可得到富集。

Tortuosity factor for porous FeAl intermetallics fabricated by reactive synthesis

The tortuosity factor is the most critical parameter for the pore characteristic of porous materials. The tortuosity factor for porous FeAl intermetallics was studied based on the Darcy law and Hagen-Poiseuille equation. Porous stainless steel with the same pore structure parameter as porous FeAl was fabricated by powder metallurgy method for comparison. The results show that the tortuosity factor of porous FeAl intermetallics is smaller than that of porous stainless steel when their pore structure parameters are the same. The average tortuosity factor is 2.26 for the porous FeAl material and 2.92 for the porous stainless steel, calculated by Hagen-Poiseuille equation. The reason of the different tortuosity factors for porous FeAl and porous stainless steel was also explored through studying the pore formation mechanisms of the two types of porous materials.

Theoretical prediction of effective elastic constants for new intermetallic compound porous material

Based on microstructure analysis of the new Ti-A1 intermetallic compound porous material, a micromechanics model of heterogeneous Plateau porous structure was established and calculation formulas of elastic constants （including effective elastic modulus, effective shear elastic modulus and effective Poisson ratio） were derived by the energy method for this porous material. Calculation results show that both the effective elastic modulus and effective shear elastic modulus increase with the increase of the relative density while the effective Poisson ratio decreases. Compared with the currently-existing hexagonal honeycomb model and micromechanics model of composite materials, the micromechanics model of heterogeneous Plateau porous structure in this study is more suitable for characterizing the medium-density porous material and more accurate for predicting the effective elastic constants of the medium-density porous material. Moreover, the obtained explicit expressions of the effective elastic constants in term of the relative density rather than the microstructural parameters for the uniform and regular Plateau porous structure are more convenient to engineering application.

Mechanism of anti-arterial thrombosis of Dahuangzhecong Fang screened by Ti-Al intermetallic compound porous material

The mechanism of antithrombotic of Dahuangzhechong Fang separated and purified by Ti-Al intermetallic compound porous material (TAICPM) was researched. Dahuangzhechong Fang, which was isolated and screened by TAICPM, was used to oral rats. At the end of study, their blood and thrombus were collected. The results show that TAICPM with the pore size of 1-5 μm can screen Dahuangzhechong Fang well. Dahuangzhechong Fang can increase 6-keto-PGF1α, lower content of TXD2 and platelet. Dahuangzhechong Fang has good effect to resist arterial thrombosis.

Fabrication of porous Fe Al-based intermetallics via thermal explosion

Porous FeAl-based intermetallics were fabricated by thermal explosion（TE） from Fe and Al powders. The effects of sintering temperature on phase constitution, pore structure and oxidation resistance of porous Fe-Al intermetallics were systematically investigated. Porous Fe-Al materials with high open porosity（65%） are synthesized via a low-energy consumption method of TE at a temperature of 636 ℃ and FeAl intermetallic is evolved as dominant phase in sintered materials at 1000 ℃. The porous materials are composed of interconnected skeleton, large pores among skeleton and small pores in the interior of skeleton. The interstitial pores in green powder compacts are the important source of large pores of porous Fe-Al intermetallics, and the in-situ pores from the melting and flowing of aluminum powders are also significant to the formation of large pores. Small pores are from the precipitation of Fe-Al intermetallics particles. In addition, the porous specimens exhibit high resistance to oxidation at 650 ℃ in air.

Pore constitution and tortuosity factor of reactively synthesized porous TiAl intermetallic compound

The pore constitution and tortuosity factor of porous TiAl intermetallic were studied on the basis of the variation behavior of pore structure parameters and the discrete particle model. The pore formation mechanism of porous TiAl is mainly ascribed to three aspects: the clearance space in green compact, the diffusive pores in the reaction process and the phase transition pores, resulting in the open porosities of 5.6%, 42.9% and 1.3%, respectively. According to the Hagen-Poiseuille equation, the tortuosity factor of porous TiAl is determined in the range of 1.3-2.2. Based on the discrete particle model and the variation rule of the tortuosity factor, the tortuosity factor depends mainly on the parameters of fabrication constant, particle shape factor, clearance distance and powder particle size. The quantitative relationships among them have been established, which can be used as the basis for adjusting the pore structure of porous intermetallics.