新型复合金属封锁剂

在实验室合成了分子量从980到45000的一系列聚丙烯酸及其钠盐。结果发现分子量较低的聚丙烯酸钠对Fe~(3+)离子具有较高的络合分散力和较强的钙皂分散力。新型复合金属封锁剂是用聚丙烯酸钠和其它助剂复配而成。同日本商品金属封锁剂K相比较,复合金属封锁剂对钙皂分散力和络合Ca~(2+)离子的能力较封锁剂K好。用复合金属封锁剂精烁后的丝绸白度为87,而封锁剂K精炼后的丝绸的白度为86.2。根据本文所得结果表明新型复合金属封锁剂是一种有效的丝绸精炼助剂。     

药物卡托普利在水溶液中扩散系数的测定

本文采用金属膜池法测定了药物卡托普利在水中的扩散系数,并考察了温度以及浓度对该扩散系数的影响.结果表明:用金属膜代替玻璃膜使传统膜池法测定扩散系数的时间缩短,操作更简便.所测得的扩散系数在同一浓度下,随着温度的升高而增加;在同一温度下,随着浓度的增加而减小.     

乙硫醚制取的实验

从实用角度出发，对乙硫醚的制取进行了实验研究，确定较为经济的制取乙硫醚的工艺路线、反应条件及反应时间，为工业生产提供了理论依据。     

金属和有机涂层的耐海水腐蚀性分析

介绍了油漆涂层、金属喷涂层、金属喷涂/油漆封闭共10种多防涂装在静海中的耐海水腐蚀性能,并对其耐腐蚀性能作了简要分析,进而选出最佳的涂装体系.实验结果表明704+842+546、702+842+546、热喷Al涂层和喷Al+842+546 4种涂装具有优良的耐海水腐蚀性能.     

基于通径系数分析的细菌脱硫实验条件优化

 为探明金属硫化矿细菌脱硫的影响因素与作用机理,采用嗜酸细菌进行柱浸实验。实验方案采用均匀设计法,分析了溶液初始pH 值、布液强度和矿石平均粒径3 个因素对脱硫效果的影响。脱硫实验结果表明,布液强度对矿石脱硫率的影响最大,矿石粒径次之,pH 值最小。对脱硫率进行回归分析,结果表明,布液强度、pH 值与脱硫率为正相关,矿石粒径与脱硫率为负相关,脱硫率预测最大值可达到19.66%。此外,电镜扫描显示,细菌脱硫作用使矿石表面由致密变为疏松,矿石表面的硫含量由43%左右降低至15%左右,表面脱硫率为65%,矿石的可燃性降低。     

Generation process of FeS and its inhibition mechanism on iron mineral reduction in selective direct reduction of laterite nickel ore

Numerous studies have demonstrated that Na₂SO₄ can significantly inhibit the reduction of iron oxide in the selective reduction process of laterite nickel ore. FeS generated in the process plays an important role in selective reduction, but the generation process of FeS and its inhibition mechanism on iron reduction are not clear. To figure this out, X-ray diffraction and scanning electron microscopy analyses were conducted to study the roasted ore. The results show that when Na₂SO₄ is added in the roasting, the FeO content in the roasted ore increases accompanied by the emergence of FeS phase. Further analysis indicates that Na₂S formed by the reaction of Na₂SO₄ with CO reacts with SiO₂ at the FeO surface to generate FeS and Na₂Si₂O₅. As a result, a thin film forms on the surface of FeO, hindering the contact between reducing gas and FeO. Therefore, the reduction of iron is depressed, and the FeO content in the roasted ore increases.     

High plastic Zr-Cu-Fe-Al-Nb bulk metallic glasses for biomedical applications

Four Zr-Cu-Fe-Al-based bulk metallic glasses (BMGs) with Zr contents greater than 65at% and minor additions of Nb were designed and prepared. The glass forming abilities, thermal stabilities, mechanical properties, and corrosion resistance properties of the prepared BMGs were investigated. These BMGs exhibit moderate glass forming abilities along with superior fracture and yield strengths compared to previously reported Zr-Cu-Fe-Al BMGs. Specifically, the addition of Nb into this quaternary system remarkably increases the plastic strain to 27.5%, which is related to the high Poisson's ratio and low Young's and shear moduli. The Nb-bearing BMGs also exhibit a lower corrosion current density by about one order of magnitude and a wider passive region than 316L steel in phosphate buffer solution (PBS, pH 7.4). The combination of the optimized composition with high deformation ability, low Young's modulus, and excellent corrosion resistance properties indicates that this kind of BMG is promising for biomedical applications.     

Effect of manganese sulfide on the precipitation behavior of tin in steel

Tramp elements such as tin are considered harmful to steel because of hot brittleness they induce at high temperatures. Because tramp elements retained in steel scrap will be enriched in new steel due to the difficultly of their removal, studies on the precipitation behavior of tin are essential. In this study, the effects of different inclusions on the precipitation behavior of tin in steel were studied. The results show that the tin-rich phase precipitates at austenite grain boundaries in an Fe-5%Sn alloy without MnS precipitates, whereas Sn precipitates at the boundaries of MnS inclusions in steel that contains MnS precipitates. MnS is more effective than silicon dioxide or aluminum oxide as a nucleation site for the precipitation of the tin phase, which is consistent with the disregistry between the lattice parameters of the tin phase and those of the inclusions.     

高效硫化亚铁钝化剂在常减压装置的应用

本文通过对化工生产装置发生硫化亚铁卣燃的危害性,硫化亚铁垢的形成及存在形式进行的探讨,介绍了FZC-1硫化亚铁化学清洗剂的性能特点及在兰州石化常减压装置的应用情况。应用结果表明,FZC-1硫化亚铁化学清洗剂对防止硫化亚铁自燃效果明显．且不会造成环境污染。     

Cu60 Zr29 Ti11大块非晶合金的粘度特征和强液体行为

采用铜模铸造法制备了Cu60 Zr29 Ti11大块非晶合金,用x射线衍射仪（XRD）、三点压弯式粘度仪对该非晶合金的动力学性质进行了研究．测定了大块非晶合金Cu60 Zr29 Ti11在过冷液相区的粘度,得到了它的动力学脆性系数m=30．848,以及流变激活能E=63．437kJ／mol．表明大块非晶合金Cu60 Zr29 Ti11是一种强液体．分析了合金在过冷态的流变激活能变化规律,发现流变激活能的变化并不符合Kivelson的super—Arrhenius公式．