Ni-Co-P/EG复合材料制备及其电磁性能研究

研究了利用化学镀在膨胀石墨表面及内部孔结构制备Ni-Co-P非晶态合金镀层的方法,探讨了合金镀层对膨胀石墨电磁性能的影响。结果表明,Ni-Co-P/EG材料电磁屏蔽效能明显提高,Ni-Co-P/EG材料电磁屏蔽效能均高于50 dB,最高达到69 dB。     

镍冶金废水处理工艺研究

报道了一种处理镍冶金废水的工艺方法。工业试验和生产结果表明，处理后水中镍残余浓度〈０．４ｍｇ／Ｌ，钴〈．１ｍｇ／Ｌ，铜〈０．０２ｍｇ／Ｌ，渣中镍含量为１１．１８％，钴０．１９３％，铜０．７４％。废水处理后达到国家排放标准，有价金属得有效回收。     

铜、镍、铅、锌4种重金属对水田土壤藻类的综合效应

为确定污水、污泥的农田施用标准,使用正交试验表L₉（3⁴）研究了4种重金属铜、镍、铅和锌在低、中、高3种浓度下对土壤藻类的数量和种类的影响。混合重金属使土壤藻类的种群结构发生改变,使蓝藻数量减少,硅藻数量或减少或增加,视条件而定,裸藻成为优势种。在土壤－藻类体系中重金属临界值铜为50mg/kg,镍为50mg/kg,铅为150mg/kg,锌为300mg/kg。     

氯化铵镀镉与无氰镀镉-钛镀层性能对比研究

对超高强度钢的氯化铵镀镉与无氰镀镉-钛两种防护镀层进行了对比研究。采用SEM分析了镀层微观形貌,用中性盐雾、天然海水浸泡和周期浸润试验评价镀层耐腐蚀性能,通过持久拉伸氢脆试验评价两种工艺的氢脆倾向,并探讨了两种工艺低氢脆机理。研究结果表明,无氰镀镉-钛镀层耐腐蚀性能和低氢脆性能都优于氯化铵镀镉镀层。     

Assessment of risk in a minerals industry: Canadian nickel

The level of rents attributable to natural resource producers depends on the risk faced by those producers. This paper argues that estimates of risk in mining should control for characteristics of firms such as diversification and debt financing. The capital asset pricing model is applied to securities of three Canadian nickel mining firms over the period 1961–1974. It is concluded that the level of risk was not unusually high.     

ECO-design of reuse and recycling networks by multi-objective optimization

An ECO-optimized reuse of process liquors addresses the financial gain and the effective use of resources. In processes that have a potential for process liquor recovery, the minimization of both economic and environmental burdens can be realised by an ECO-optimal design of reuse and recycling network (RRN).In this paper, a procedure for synthesizing such an RRN for a metal finishing process is investigated. The simultaneous analysis of environmental impact sensitivity (SAEIS) based on a superstructure approach, combined with multi-objective optimization is performed by mixed-integer nonlinear programming (MINLP). This allows an “eco–eco” trade-off i.e. total annualized cost and environmental impacts are minimized simultaneously. By varying the weighting factor, different RRN alternatives were generated. A replacement of the standard and closed-loop system by these solutions, even for the environmentally friendliest case, yielded a reasonable cost saving on raw material's inputs.     

13X沸石去除废水中镍离子的实验研究

实验着重研究了合成 1 3X沸石分子筛吸附重金属离子中的镍离子。结果表明 :当废水pH≥ 5 ,CNi2 + ≤ 2 0 0mg/L ,吸附时间为 30min ,按镍 /沸石质量比为 1∶50投入沸石进行处理 ,镍离子的去除率可达到 99%以上。处理后废水均达到工业排放标准。     

镍对纤维藻（Ankistrodesmus．sp．）毒性作用研究

本文研究了重金属镍对一种淡水绿藻──纤维藻（Ａｎｋｉｓｔｒｏｄｅｓｍｕｓ．ｓｐ．）的毒性作用．结果表明：纤维藻对镍毒作用反应敏感．镍对纤维藻的半数有效浓度９６ＥＣ５０为０．３３μｇ／ｍＬ镍，当镍浓度≥０．４μｇ／ｍＬ时，纤维藻的生长受到明显抑制，生长滞期延长，光合作用受阻，细胞膜透性增加．当镍浓度为３．２μｇ／ｍＬ时，其蛋白质氨基酸含量明显下降．     

Shift in ectomycorrhizal community composition in Scots pine (Pinus sylvestris L.) seedling roots as a response to nickel deposition and removal of lichen cover

Scots pine seedlings were exposed to wet-deposited nickel (Ni) and removal of lichen cover in a dry heath Scots pine forest. Ni deposition affected the colonization of roots by indigenous ectomycorrhizal fungi in contrasting ways in intact and skimmed quadrats. Highest frequencies of tubercle morphotypes of ectomycorrhiza were found in quadrats exposed to 100 mg m⁻² year⁻¹ Ni in lichen covered treatment, while in skimmed quadrats these peaked after the treatment with 10 mg Ni m⁻² year⁻¹. Removal of the lichen layer increased the value of diversity index (H′) of ectomycorrhizal fungal community, probably due to the increase in the evenness of the morphotype distribution. Lichen removal seemed also to improve the condition of the short roots, as the frequencies of poor and senescent short roots were decreased by the removal.     

35Cr2Ni4MoA 材料防腐蚀性能验证研究

目的验证35Cr2Ni4MoA材料采取镀硬铬、封孔表面防护的耐腐蚀性能。方法开展35Cr2Ni4MoA材料表面镀硬铬有无封孔防护状态下的实验室加速腐蚀环境试验,研究材料表面腐蚀行为特点,加速腐蚀试验共8个周期。通过蚀坑深度、腐蚀面积、单位面积腐蚀数量等描述35Cr2Ni4MoA材料表面腐蚀情况。结果 35Cr2Ni4MoA材料表面镀硬铬和封孔防护后试验件腐蚀程度明显减低。结论镀硬铬、封孔表面防护能有效提高海洋环境下35Cr2Ni4MoA材料表面的耐蚀性能。