从白葡萄皮中──联产果胶和色素的研究

介绍了在加热条件下，浸取葡萄皮，经浓缩后，用醇沉析得果胶；残渣经丙酮浸取、过滤、滤液浓缩后得色素的新工艺。所得产品收率高，质量合格，可以免去一般果胶生产中的脱色过程。     

Towards proving type safety of .NET CIL

A crucial role in the Microsoft .NET Framework Common Language Runtime (CLR) security model is played by type safety of the Common Intermediate Language (CIL). In this paper, we formally prove type safety of a large subset of CIL. To do so, we begin by specifying the static and dynamic semantics of CIL by providing an abstract interpreter for CIL programs. We then formalize the bytecode verification algorithm, whose job it is to compute a well-typing for a given method. We then prove type safety of well-typed methods, i.e., the execution according to the semantics model of legal and well-typed methods does not lead to any run-time type violations. Finally, to prove CIL’s type safety, we show that the verification algorithm is sound, i.e., the typings it produces are well-typings, and complete, i.e., if a well-typing exists, then the algorithm computes one.     

Characterization of refractory behaviour of complex gold/silver ore by diagnostic leaching

The amenability of a refractory ore to the extraction of gold and silver by cyanide leaching was investigated. Diagnostic leaching tests were also performed to shed light on the refractory characteristics of ore. The leaching tests show that the extraction of gold and silver is consistently low, i.e. ≤47% and ≤19.2%, respectively, over a leaching period of 24 h. Even fine grinding (e.g. ＜38 μm) does not improve the recovery of gold and silver. Diagnostic leaching approach provides information into the cause of the refractoriness of the ore. The findings suggest that the refractoriness is induced by the dissemination and encapsulation of the very fine gold and silver particles largely in the carbonates, oxides and sulfides and, to a small extent, with silicates present in the ore matrix. These findings highlight the practical importance of diagnostic leaching for the understanding of the refractory characteristic of such an ore and for the identification of possible pretreatment options to overcome its refractoriness prior to cyanide leaching.     

活性炭吸附金的初步研究

本文介绍美国研究活性炭从矿浆中吸附金的方法和设备,以及我们采用该方法所取得的研究成果。其中包括活性炭的种类及其用量的确定;金的吸附速率和金的平衡吸附曲线;以及炭浆法和炭浸法的比较。     

菲尔普斯道奇公司莫伦西矿操作的改变

1999年末,菲尔普斯道奇宣布,莫伦西矿将削减选矿厂的生产,专门破碎高品位可浸出浅生矿,进行湿法冶金,即矿山-浸出项目(MFL——Mine-for-Leach),这使莫伦西变成了全电积铜生产商,并将铜的湿法冶金年生产量扩大了2．4亿多磅,总量达8．2亿lb。MFL项目于2001年一季度投产,大约投资2．2亿美元。莫伦西矿生产转为MFL是多种因素相结合的结果:矿石品位的降低、铜市场的周期性及低成本湿法冶炼工艺的技术发展。本文总结了在此过程中的许多变化,包括湿法冶金工艺的最新变化。     

清洁的炼铜工艺

本文简要介绍了世界上各种处理硫化铜矿的新型湿法炼铜工艺的发展现状及其日益看好的应用价值。     

Oxynitride glasses—An overview

The theory and practice of oxynitride glass synthesis and property evaluation came into effect since late 70’s. Its importance lies in the fact of its formation at the grain-boundary of synthesized silicon-nitride ceramics with additives. Earlier, heating an oxide glass with NH₃ and/or N₂ was the route to obtain oxynitride glass. Later on greater amount of nitrogen retention was made possible using AlN or Si₃N₄ as batch material. Silicate, borate and phosphate systems were studied in isolation or in conjugation. Melting temperature of such glasses varied from 1500–1800° C. Different technological developments regarding furnace atmosphere, temperature, compositions etc have been discussed towards a successful synthesis with a thermodynamic approach. Nitrogen content in glass as high as 36.8 eq% has been reported by the application of an overpressure of 30 atm N₂. Different physical and chemical properties have been discussed in relation to nitrogen content in glass. Structural aspects have been considered with respect to XPS and IR spectroscopic studies. Finally some points have been highlighted towards some potential applications     

某离子型稀土矿采矿活动对地下水的影响分析

离子型稀土原地浸矿工艺原理是用硫酸铵作为浸矿液,把呈吸附态的稀土离子交换浸出并回收稀土元素。该工艺对环境的影响主要是由于浸矿液的渗漏而造成地下水中氨氮浓度增加。针对该种工艺,如何采取有效措施保护地下水质量意义重大。以某稀土矿地下水环境影响评价为例,通过设置两种情景模式,应用数值法来证明地下水水力截获是原地浸矿区地下水质量保护的有效措施。     

多金属硫化矿综合回收进展

介绍了近年来多金属硫化矿浮选的进展、浮选工艺和浮选药剂的现状及发展,总结了国内多金属硫化矿混合精矿化学法处理工艺的研究进展。对各种工艺进行了简单介绍和评论,并对其发展趋势进行了展望。     

Recovery of Mo from Ni-Mo ore leach solution with carrier co-precipitation method

In this paper, “nascent” Fe(OH)₃ as carrier precipitation and NaHCO₃ as buffer agent were used to extract molybdenum from the complex Ni-Mo ore leach solution. The effects of different variables on the molybdenum extraction, such as the dosage of FeCl₃ and NaHCO₃ and the reaction temperature and time, were studied. The results showed that over 99% of molybdenum were extracted in 2 h at 25 ± 1 °C under the conditions of mole ratio of Fe³⁺/Mo 2.2-2.5 and mass ratio of NaHCO₃/Mo 0.7-1.5. About 92% of Mo in the Fe(OH)₃ precipitation can be leached by NH₃⋅H₂O to prepare the ammonium molybdate solution with about 100 g/L Mo. After treating with NH₃⋅H₂O, the Fe(OH)₃ precipitation was dissolved with HCl to obtain the FeCl₃ solution (FeCl₃ 500 g/L) which can be reused for the next round of experiments.