用25号黑药改善分选作业和优化选矿指标

25号黑药具有捕收能力弱，选择性好的特点，用于铅浮选作业做主捕收剂，对改善铅、锌分离效果，优化铅浮选矿指标有重要作用。     

高铁酸钾氧化处理含苯胺黑药废水试验研究

研究了用高铁酸钾处理含苯胺黑药废水,考察了反应时间、高铁酸钾用量、废水pH和温度对模拟废水中苯胺黑药去除率的影响及废水pH和电位的变化。结果表明,随反应时间延长和高铁酸钾投加量增大,废水中苯胺黑药去除率逐渐提高;较低的废水起始pH(5.85)和较高反应温度(30℃)都有利于苯胺黑药的去除;在废水起始pH=8.0、30℃、苯胺黑药初始质量浓度40mg/L、高铁酸钾初始质量浓度0.8g/L条件下反应30min,苯胺黑药去除率可达98.38%;随反应进行,废水pH先小幅升高然后小幅下降;废水电位先快速下降然后逐步升高并趋于稳定。用高铁酸钾去除废水中的苯胺黑药是可行的。     

新型36号黑药的选矿性能验证实验与生产实践

新型36号黑药是一种捕收能力强、选择性好、用量省的优质高效捕收剂,对方铅矿及伴生银矿物的回收具有较好的浮选效果.经工业选矿实验表明,该新型药剂的应用,可取得较好经济效益和社会效益.     

浅析氧化技术降解有机选矿药剂的研究分析

矿产资源有着悠久的历史,随着经济不断发展,矿产资源在国民经济发展中有着不可或缺的地位,是国家对内外发展的重要领域,涉及到多个领域,如农业、轻工、化工、冶炼、机械、建筑、能源、交通等,尤其在当今科技化的时代,矿产资源在我国经济中发挥着不可或缺的作用,在产业中有着中流砥柱的作用基于经济建设需求,矿产资源的大量开发不可避免,在选矿（即对原矿的加工、提炼）过程中,需要使用大量的有机选矿药剂,如果将残留有机选矿药剂的废水不经过加工处理直接排放到河流中,有机选矿药剂中所含的有害物质,如各类烷基黄药、苯类物质、有机磷等,会造成河流的污染和河流中生物的死亡。统计结果表明,我国每年因直接排放采矿和选矿的废水,至少要排出12～15亿吨的污水,是有色金属工业废水排放量的30%左右,为了减少残留有机选矿药剂的废水对人类的危害和对自然的污染,降解有机选矿药剂的有效方法是人们的迫切的追求。     

黄药,黑药,二号油在水体中的降解试验研究

本文总结了黄药，黑药，二号油在水体中降解变化规律和其影响因素，为治理浮选废水，预测其对自然环境影响提供了科学依据。     

微波/CIO《,2》体系降解水中苯胺的研究

以苯胺为研究对象,对微波/CIO<,2>体系降解苯胺的过程进行了研究,分别考察了微波功率、微波辐照时间、CIO<,2>投加量、初始pH和CIO<,2>反应时间对苯胺降解的影响规律.结果表明,微波/CIO<,2>体系适宜处理苯胺浓度较低的废水,在微波功率500 W、辐照时间10min、CIO<,2>:投加量180 mg/L,初始pH 5时效果较优.微波/CIO<,2>体系降解水中苯胺具有协同作用,出水满足<污水综合排放标准>(GB8978-1996)中3级标准.     

A动给药在选矿中的应用

自动给药在选矿生产中发挥了至关重要的作用，文章介绍了PLC自动给药技术的特点、原理、工业运行情况，并对其应用效果进行了分析。     

黑药应用领域的拓宽

介绍了浮选药剂黑药在湿法冶金中作萃取剂及石油工业中作石油添加剂的研究结果，以及０．０－二烷基二硫代磷酸锌的制造。同时指出了其制造０．０－二烷基二硫代磷酸时应注意的问题。     

Effect of aniline on ethanol oxidation and carbohydrate metabolism in isolated hepatocytes

The addition of aniline to isolated hepatocytes derived from fasted rats and incubated with ethanol, caused a 30-60% decrease in the rate of ethanol oxidation. The degree of inhibition was dependent on aniline concentration, 5 mM causing near-maximal inhibition. Aniline reduced the activity of alcohol dehydrogenase in a noncompetitive manner, but had no effect on aldehyde dehydrogenase activity nor on reducing-equivalent transfer between the cytoplasm and mitochondria. The inhibition of alcohol dehydrogenase by aniline was associated with a decrease in the inhibitory effects of ethanol on glycolysis. Aniline, added to hepatocytes in the presence or absence of ethanol, inhibited gluconeogenesis from lactate and pyruvate, but not from sorbitol or fructose.     

Evidence for UV-B-induced DNA degradation in Euglena gracilis mediated by activation of metal-dependent nucleases

It is demonstrated that in vivo irradiation with artificial UV-B for several hours significantly reduces the amount of large DNA extractable from immobilized Euglena in comparison with non-irradiated controls. This UV-B effect can be eliminated by a drastic reduction of the divalent ion concentration in the extracellular medium, i.e. the substitution of the culture medium by Tris-buffered agarose. Moreover, in vitro degradation of large DNA is demonstrated for crude protein extracts isolated from non-irradiated or UV-B-irradiated Euglena. The nuclease activity is shown for both crude protein extracts and purified nucleases; in both cases, two protein bands possessing nuclease activity are obtained with apparent molecular masses of 26 and 40 kDa and their activity is inhibited by specific nuclease inhibitors, i.e. aurintricarboxylic acid and ATP, applied at a concentration as low as 10(-8) M. Moreover, in vitro, nuclease activity clearly depends on the pH, with an optimum around pH 4.5, and on the ion composition of the extracellular medium. A strong stimulating effect is shown for Ca2+ with an optimum around 10(-4) M; this effect is potentiated by Zn2+ and Mn2+, but strongly counteracted by Mg2+ and the calmodulin inhibitors trifluoperazine and N- (6-aminohexyl)-5-chloro-1-naphthalenesulphonamide (W5). These results favour the concept which explains the lethal UV-B effect on Euglena as arising from a change in the general metabolic state of the cell and an activation of a DNA-degrading system, i.e. activation of metal-dependent nucleases (U.K. Tirlapur, D.-P. H?der and R. Scheuerlein, UV-B mediated damage in the photosynthetic flagellate, Euglena gracilis, studied by image analysis, Beitr. Biol. Pflanzen, 67 (1992) 305-317).     

Oxidation of aniline to nitrobenzene by nonheme bromoperoxidase

Nonheme bromoperoxidase found in Pseudomonas putida catalyzed the bromination of aniline with hydrogen peroxide and bromide ions to give o- and p-bromoanilines. However, in the absence of bromide ions, it oxidized aniline via azobenzene and azoxybenzene finally into nitrobenzene. This is the first report of the biological oxidation of an arylamine to the corresponding nitrocompound at the enzyme level. In addition, nitrobenzene was not formed by a nonheme bromoperoxidase from Corallina pilulifera (marine alga), implying that the alga enzyme has a different reaction mechanism.     

In vitro metabolism of aniline by sheep intestine

1. The major metabolite after incubating aniline with sheep intestine was acetanilide. 2. Other metabolites detected in smaller amounts were 2-aminophenol, 4-aminophenol, 2-acetamidophenol and 4-acetamidophenol. 3. The rumen, abomasum duodenum, jejunum, ileum and colon were all able to acetylate aniline. 4. 4-Aminophenol, 4-aminobenzoic acid, 4-anisidine and 4-nitroaniline were also acetylated.     

Physiology of aniline catabolism by achromobacter Ir2

A bacterium was isolated from soil which utilizes aniline as sole source of carbon and nitrogen. It was identified as Achromobacter sp. The cells grow at concentrations in the range of 0.5 to 1.25 mg aniline/ml with a growth rate of 0.3 h-1. Substrate inhibition was observed at concentrations higher than 1.5 mg/ml, 3.0 mg/ml completely inhibit the growth. The yield coefficient was 0.63. Aniline was degraded with an activity of 200 microng/mg cell dry weight/hour. Aniline was assimilated and completely degraded. The remaining nitrogen was quantitatively detected as ammonia. The enzyme system involved in aniline degradation was induced by aniline but not repressed by succinate and ammonia.     

Effect of atmosphere on microwave heating of titanium powder

Abstract

Microwave irradiation was performed using compacted Ti powder in three types of atmosphere, namely, Ar gas, N₂ gas and air. The temperature increased slightly in the early stage of microwave irradiation and then remained almost unchanged. Thereafter, abrupt temperature rise and drop occurred. The temperature then remained almost unchanged in the late stage of microwave irradiation. The time from which the abrupt temperature rise and drop occurred was varied by the atmosphere. The maximum temperature in microwave irradiation in Ar gas was near the melting point of Ti, while those in N₂ gas and air were beyond this melting point. Although a TiO₂ layer was formed near the upper surface of the compacted powder after microwave irradiation, α-TiN and TiN were produced in its interior. The microwave heating behaviour and microstructure of the compacted powder after microwave irradiation depended on the atmosphere and the amount of air contamination in it.     

多孔结构对材料吸波性能的影响

总结了当前多孔材料吸波性能的研究现状，指出多孔结构可改善材料的吸波性能，而孔径、相对密度及厚度是影响多孔材料吸波性能的重要因素，对多孔陶瓷材料而言，适当降低孔径、增加相对密度与厚度有利于提高材料的吸波性能．在此基础上对多孔金属材料泡沫铝的吸波性能进行了初步研究，分析了相对密度与微波频率对材料吸波性能的影响，研究表明，降低多孔金属的相对密度可以显著提高材料的吸波性能；随着微波频率的增加，材料的吸波性能也随之增加．     

示波极谱法测定水中微量苯胺的研究与应用

苯胺在磷酸盐介质中(pH=10．4)与次氯酸钠、苯酚反应，其产物靛酚蓝在磷酸盐-氢氧化钠介质中(pH=12．74)，在-0．42V处(VS．SCE)产生灵敏的吸附波。苯胺质量浓度在0.004--2.8mg／L范围内，峰电流值(ip″)与其呈良好的线性关系，最低可检测0．002mg／L的苯胺。该方法用于环境水样中微量苯胺的测定，结果与标准方法吻合。