Effects of Na3PW12O40 on the corrosion behavior of carbon steel in 55 %LiBr solution

Electrochemical technologies, chemical immersion tests and surface detection technologies were adopted to study the inhibition performance of Na₃PW₁₂O₄₀ inhibitor on carbon steel in 55 % LiBr + 0.07 mol/L LiOH solution, and the inhibition mechanism was discussed. Results indicated that Na₃PW₁₂O₄₀ inhibitor caused the decrease of both anodic and cathodic polarization current density and a widening of the passive potential region. It behaved as a mixed inhibitor. When the concentration of Na₃PW₁₂O₄₀ in 55 % LiBr + 0.07 mol/L LiOH solution was 300 mg/L, excellent inhibition performance on carbon steel was obtained. When the solution temperature were 145°C, 160°C, 180°C and 200°C, respectively, the corrosion rates of carbon steel were 13.07 μm/y, 17.74 μm/y, 24.55 μm/y and 73.52 μm/y accordingly. Na₃PW₁₂O₄₀ inhibitor exhibited an excellent inhibition performance at high temperature. Na₃PW₁₂O₄₀ is a strong oxidant. Fe was oxidized to Fe₂O₃ and itself was deoxidized to heteropoly blue. By this mechanism, an integrate compact passive film mainly comprising Fe₂O₃ may be formed on the carbon steel surface, and the corrosion of carbon steel in 55 % LiBr solution may be retarded by this passive film.     

青海门源某萤石矿新药剂新工艺试验研究

青海门源某萤石选矿厂生产现场生产CaF295%左右的萤石精矿,品位较低,其主要原因是精矿中CaCO3含量严重超标。针对该情况,通过大量的探索试验,确定采用高效抑制剂T-29与酸性水玻璃组合作为碳酸钙抑制剂,并通过选矿工艺流程的优化,使萤石与方解石得到了有效分离。最终得到含CaF298.19%,回收率为88.31%的萤石精矿,该精矿达到了制酸级萤石国家一级品标准。     

吡唑类细胞周期蛋白依赖性激酶抑制剂的研究进展

细胞周期蛋白依赖性激酶(cyclin-dependent kinases,CDKs)是一类重要的抗肿瘤药物研究靶标。吡唑环作为杂环化合物中的一个重要分支,因其广泛的抗肿瘤活性备受药物化学家关注。近年来大量具有抗肿瘤活性的吡唑类CDKs抑制剂被报道,其中一些化合物已进入临床试验阶段。本文从抑制剂的结构类型出发,对吡唑类CDKs抑制剂的研究进展进行综述。     

斑岩铜矿铜钼分离工艺研究

介绍了钼的特性及铜钼分离技术发展现状,探讨了铜钼分离最佳工艺操作条件。试验结果表明,当选用巯基乙酸作抑铜浮钼分离抑制剂,可以很好地解决钼矿选别作业回收率低的问题。在选定的最优化条件下,经过多次精选后,钼精矿品位最终可稳定在含Mo 50.00%以上,铜钼分离钼的回收率可提高到85.00%。     

Chemical bases for maize grain resistance to infestation and damage by the maize weevil,Sitophilus zeamais Motschulsky

It was suggested that the factors that confer resistance on a maize variety against Sitophilus zeamais Motschulsky are chemically based. To test this hypothesis, resistance indices of the weevil were assessed using a new scale developed by Nwosu et al. (2015a) after performing detailed chemical analysis of the whole-maize grain using twenty elite maize varieties under ambient temperature and relative humidity of 30.7 °C and 74.5% respectively. Increases in maize varietal crude fibre, phenolic acid and trypsin inhibitor increased significantly mortality of S. zeamais adults and reduced significantly survival rate of S. zeamais adults, percent of grain damage, percent of weight loss, weight of grain flour and oviposition by the adult females. The level of cystein proteinase inhibitor (a natural protectant of plants against insect attack) in the grains was not on its own responsible for increased mortality, reduced grain damage and reduced oviposition. The study identified crude fibre, phenolic acid and trypsin inhibitor of whole-maize grain as the bases for resistance. Their significant increase in grains resulted in low infestation. Whereas, increased protein, zinc, magnesium, calcium, sodium, phosphorus, manganese, iron, cobalt and starch rendered the elite maize grains susceptible to S. zeamais attack. Therefore, significant incorporation of the bases for resistance and significant reduction of the bases for susceptibility in maize grains during breeding programmes is advocated; provided this does not adversely affect palatability and nutritional needs of man. Eighty-five percent of the elite maize varieties were at least resistant to S. zeamais infestation and damage. The resistant varieties, particularly 2000SYNEE-WSTR and TZBRELD3C5 maize with high resistance should be promoted for growing. Antibiosis, antixenosis and preference were the mechanisms of maize grain resistance to S. zeamais attack.     

新型抑制剂BK511在某矿铜钼分离浮选中的试验研究

研究采用新型抑制剂BK511,对强捕收剂黄药浮选的铜钼混合精矿进行了铜钼分离浮选试验研究。试验采用两次铜钼分离粗选、钼粗精矿一次精选后再磨、再经五次精选工艺流程,获得了钼精矿含钼45.31%,含铜1.14%,钼回收率89.94%的浮选指标。试验结果表明,BK511对采用强捕收剂黄药浮选的铜钼混合精矿中的铜矿物,具有较好的抑制作用。     

Recent advance in inhibition of dark fermentative hydrogen production

Dark fermentative hydrogen production is an effective and feasible technology for biological hydrogen production. However, this technology has not been commercially applied yet. One of the major reasons is that several inhibitory factors limit hydrogen production and the commercial potential. In this review paper, the various inhibitory factors which influence the dark fermentation hydrogen production were systematically analyzed and summarized, including inorganic inhibitors (heavy metal ions, light metal ions, ammonia, sulfate and hydrogen gas), organic inhibitors (volatile fatty acids, furan derivative and phenolic components), and bio-inhibitors (bacteriocins and thiosulfinate). The inhibitory concentration and mechanism were discussed in-depth and comprehensively. The strategies for mitigating these inhibitory factors were also introduced and discussed. Suggestion for future study in this aspect was proposed to promote the scale-up and commercial application of dark fermentative hydrogen production.     

KA-01和硫脲TU在磷酸中的缓蚀作用

缓蚀剂KA-01是室内合成的有机缓蚀剂。本文通过静态腐蚀试验和电化学测量对缓蚀剂KA-0l和硫脲(TU)及复配物在15％和28％磷酸中对A3钢的缓蚀性能进行评价,结果表明KA-01和硫脲在30℃和90℃15％和28%磷酸中单独使用具有较好的缓蚀作用,而二者复配使用其缓蚀效果明显增加,在90℃15％和28%磷酸中加入1．8％KA-0l和0．2%TU时A3钢的腐蚀速度低于1g／m^2．h,缓蚀率高达99．8%以上,电化学测量结果表明KA-01和TU是以阴极控制为主的缓蚀剂,而二者的复配物则表现出阴阳极混合控制的特征。     

新沟油田注水系统腐蚀原因及治理研究

新沟油田注入水注入管网后极易结垢,腐蚀严重。为了解决腐蚀问题,在研究了腐蚀机理、造成水质变化的原因和影响系统腐蚀的因素的基础上,提出了适合新沟油田注水系统的防腐防垢技术,并筛选出了效果良好的缓蚀剂。     

硬软酸碱原理与缓蚀剂设计

简要介绍了硬软酸碱原理、理论基础、标度方法及其在缓蚀剂研究中的应用．在酸性介质中，铁的表面被认为是款设，属于软碱的缓蚀剂对其腐蚀有较好的抑制作用；钝化的金属表面被认为是硬酸，软碱的存在对钝化膜的稳定不利．氟离子在铁电极表面的吸附将使铁的软酸性质变得更软．