浸金尾渣选铁的尾矿沉降性能研究

应用沉降法研究了浸金尾渣选铁尾矿在水介质中的沉降行为.考察了阳离子型、阴离子型及非离子型絮凝剂的分子量变化对浸金尾渣选铁尾矿沉降性能的影响.结果表明:阴离子型聚丙烯酰胺对细粒尾矿的絮凝效果最好,阳离子型和非离子型聚丙烯酰胺对细粒尾矿的絮凝效果较差,阴离子型聚丙烯酰胺的最佳药剂用量为20g/t.     

复合添加剂对交直流叠加电解精炼铜的影响

以氯化钾、明胶和硫脲为基础添加剂,复配聚丙烯酰胺、十二烷基苯磺酸钠、糖精和添加剂A中的一种或几种制得一系列复合添加剂,研究其对交直流叠加电解精炼铜的影响,并对复合添加剂的作用机理进行简单探讨。结果表明:自制复合添加剂均能不同程度的改善阴极铜质量,添加剂Ⅷ(含硫脲5 mg/L、聚丙烯酰胺10 mg/L和添加剂A 0.6 mL/L)和Ⅹ(含氯化钾10 mg/L、硫脲5 mg/L、明胶6 mg/L和添加剂A 0.6 mL/L)是两种作用效果较好的复合添加剂,可以明显改善阴极铜质量,有望成为未来铜电解精炼工艺中的新型复合添加剂。     

铜冶炼企业生产废水除氟工艺实践研究

以某铜冶炼企业生产废水为研究对象，采用聚合硫酸铁协同硫酸铝对生产废水进行除氟试验。根据试验结果表明，在低砷废水（砷含量小于1mg/L）中氟含量小于30mg/L条件下，废水与一定量的聚合硫酸铁、硫酸铝、PAM、熟石灰（聚合硫酸铁添加量为0.1g/L，硫酸铝添加量为2～3g/L）反应并将溶液的pH值调整至在6～8的之间时，反应后的废水中氟<5mg/l，低于回用水标准，砷含量可以降低至0.5mg/L以内，能够满足GB 25467—2010《铜、钴、镍工业污染物排放标准》。     

某氧化铜钴矿选矿废水处理与回用试验研究

试验研究了聚合铁、硫酸铝、硫酸亚铁、聚丙烯酰胺（PAM）、PAM＋硫酸铝等五种絮凝剂对某氧化铜钴矿选矿废水的沉降效果以及处理后的废水对选矿指标的影响。大量的试验表明PAM＋硫酸铝组合絮凝效果最佳,特点是处理的废水絮凝体大、沉降速度快、水质澄清、处理成本低、对选矿指标基本无影响,并能降低选矿药剂用量等。     

钢铁厂焦化废水混凝预处理实验研究

对钢铁厂焦化废水混凝预处理效果进行了试验研究,考察了混凝剂种类、投加量、反应温度和时间对处理效果的影响。结果表明,在焦化废水水温35℃,采用300mg/L的PAC(聚合氯化铝)和10mg/L的PAM(聚丙烯酰胺)作为预处理混凝剂,处理时间120min,焦化废水浊度去除率达到80%。试验证明,混凝预处理工艺对焦化废水色度、浊度去除效果较好,能够达到预处理要求,为后续树脂吸附工艺提供原水。     

吸附-絮凝法去除铼萃取有机废液中COD

以江西某厂铼生产过程中产生的难降解萃取有机废液为研究对象,采用吸附-絮凝法去除企业萃取废液中难降解的化学需氧量（COD）。每100 mL该废液加入5 mL浓度为5%的聚合氯化铝（PAC）溶液和0.5 g炭粉搅拌15 min,再加入1 mL浓度为0.3%的聚丙烯酰胺（PAM）溶液,抽滤后,COD可从1368 mg/L降至200 mg/L,废液COD去除率为85.38%。研究结果表明,该方法可大幅提高难降解有机废水中COD的去除率,保证现有污水处理后续工序水质的COD稳定,减轻企业环保压力,降低运行成本。     

含氰废水处理方法的研究

针对采用湿法提纯金泥的企业处理含氰化物的废水,采用氯化法提纯金泥中的黄金,由于金泥含有大量氰化物,在预浸工序产生的废水中氰化物含量达到2 000 mg/L 左右。国家规定排放废水中含有的氰化物浓度不得超过0.5 mg/L,本企业要求排放废水中氰化物的浓度不得超过0.04 mg/L,预浸产生的废水必须经过脱氰化处理才能排放。经过实际研究,结合精炼厂现有工艺设备,采用酸性氯化法和活性炭吸附法相结合来脱出废水中的氰化物,经过处理的废水总氰含量低于0.04 mg/L,达到排放标准,最后排入焦家金矿选厂。     

硫酸铝除氟在金隆公司废水处理工艺中的应用

利用金隆公司现有的中和废水处理系统,通过往含氟约16mg/L废水中添加硫酸铝药剂,Al/F摩尔比约4/1,控制废水pH值为6～8,反应时间约30min,除氟效率达到80%以上,排放废水氟含量稳定控制在3.5mg/L以内,满足国家《铜、镍、钴工业污染物排放标准》(GB25467-2010)规定的≤5mg/L的标准要求。     

龙岩市某矿业有限公司选铁尾矿浆絮凝沉降试验研究

选铁尾矿资源综合利用是重要发展趋势,具有广阔的市场前景。本试验选取聚铝、聚丙烯酰胺、烧碱-Na OH三种絮凝剂对龙岩市某矿业有限公司选铁尾进行矿浆絮凝沉降试验研究。结果表明,该尾矿中细粒级含量较高,自然沉降困难,必须加絮凝剂,使微细颗粒絮凝成团,加速沉降;3#絮凝剂对该尾矿絮凝沉降效果较好;矿浆浓度10%时,3#絮凝剂用量25g/t絮凝沉降效果较好。     

常规卤化物和高分子材料抑制尾矿库扬尘的试验

选取溶液质量浓度、溶液喷洒量以及外部风速作为变量,通过室内试验考察了常规卤化物和高分子材料对扬尘控制的效果。以抗风蚀能力和结壳抗破坏能力为响应变量。结果表明,随着抑尘剂浓度的增加和喷洒量的增加,结壳的抗风蚀性和抗破坏性可以得到提高。在卤化物溶液中,CaCl₂的抑尘性能最好。在风速为7.5 m·s?1的条件下,CaCl₂喷洒量为4.5 L·m?2,且其质量浓度为50 g·L?1时,尾矿质量损失量为0.75 g·m?2·min?1,贯入阻力为466 kPa。在高分子材料中,聚丙烯酰胺的抑尘效果最好。在风速为7.5 m·s?1的条件下,聚丙烯酰胺喷洒量为4.5 L·m?2,且其质量浓度为0.5 g·L?1时,尾矿质量损失量为0.30 g·m?2·min?1,贯入阻力为248 kPa。抑尘剂的选取可根据当地年均风速确定,年均风速较大时,可选择聚丙烯酰胺作为尾矿库抑尘剂,反之则可选择CaCl₂为尾矿库抑尘剂。      

Regional differences in suicide in Hungary in the light of registered cases of depression

Author made a revision on the theory published by Rihmer and alii in the year 1989. According to this theory the marked regional differences of suicide in Hungary are caused by the different discovery of the "endogen depression" (rate of diagnosed depression). So the lower is the diagnosis of depression the higher is the suicide rate in a given territory. They have seen a negative correlation between the number of working physicians and the suicide rates. Author made a reexamination on a correct database between 1985-1994. He has also made a study using the DSM-III-R diagnostic criteria in four counties of Hungary. His results deny the theory above mentioned. The rank-correlation of the number of GP and the suicide rates in Hungary in years 1985-1994 did not show correlation. So the underdiagnosis of the depressive disorders and the different number of GP are not the cause of the regional differences of suicide in Hungary.     

Role of clozapine in the occurrence of chromosomal abnormalities in human bone-marrow cells in vivo and in cultured lymphocytes in vitro

Bone-marrow chromosomes were examined from 38 mentally and physically retarded and two psychiatric patients who were being treated with a variety of neuropharmacologic drugs. Twenty of these patients used clozapine (Leponex). The clastogenic effects of clozapine in vitro were studied in the lymphocyte cultures of three patients--one free of hematologic disease and two who 6 months earlier had had agranulocytosis attributed to the use of clozapine. The mean frequency of cytogenetic abnormalities in the bone-marrow cells of patients who used clozapine was significantly increased (P less than 0.05). The two patients who had had agranulocytosis had a greater frequency of cytogenetic abnormalities in their cultured lymphocytes in vivo and in vitro than the patient free of hematologic disease. A clone with a 13/14 chromosome translocation was detected in one of the patients. As all patients received a number of drugs during the in vivo and in vitro studies no definite conclusions could be drawn regarding the role played by clozapine in the occurrence of chromosomal abnormalities.     

Efficacy of lomefloxacin in treatment of nonspecific inflammatory diseases and in prophylaxis of postoperative complications in urology

Clinical and bacteriological efficacies of lomefloxacin and ofloxacin were comparatively estimated in the treatment of 104 urologic patients with nonspecific inflammatory diseases and in 36 urologic patients for prophylaxis of inflammatory complications after surgical interventions. The majority of the urinary tract pathogens i.e. Enterobacteriaceae spp. and gramnegative nonfermenting bacteria were highly susceptible to both the fluoroquinolones. The clinical and bacteriological efficacies of lomefloxacin amounted to 94.4 and 80.7 per cent and those of ofloxacin to 92 and 79.2 per cent respectively. The prophylactic use of lomefloxacin and ofloxacin was efficient in 94.7 and 94.1 per cent of the cases respectively. The antibacterial prophylaxis in urologic patients should be applied not only at the period of surgical interventions but also during the early postoperative period.     

Difference in changes of plasma volume in two types of Goldblatt hypertension in rabbits

High plasma renin concentration (PRC) and hematocrit (Ht) were observed in hypertensive rabbits with one renal artery clipped and an intact opposite kidney (Group A), while rather low PRC and Ht in hypertensive ones with one renal artery clipped and the opposite kidney removed (Group B). Plasma volume (PV), blood volume (BV), and packed cell volume (PCV) were estimated in these two types of hypertensive rabbits, and also in sham-operated rabbits (Group C). In Group A, 4 weeks after clipping of a renal artery, PV was decreased and significant inverse correlations were observed between PV and the elevation of blood pressure and between PV and PRC. A significant correlation between PRC and the elevation of blood pressure was also found 4 and 12 weeks after the clipping. PCV was increased until 12 weeks after clipping. In Group B, PV was increased 1 and 4 weeks after clipping, then returned to the initial level. Ht was decreased 1 and 12 weeks, and PCV was decreased 12 weeks after clipping. These results would indicate that a high Ht seen in Group A was partly due to the decreased PV and partly due to the increased PCV, while, in Group B, a low Ht in early stage might be mainly due to the increased PV, but in the late stage, a decreased PCV appeared to play a role to lower Ht. PRC seems to be affected differently by PV in these two types of hypertension.     

PLC在高炉汽动式鼓风机监控系统的应用

鞍钢高炉15号鼓风机是VASi-9018型轴流式汽轮压缩机，通过技术改造，采用先进的电子控制技术，建成了全新的具有现代化水平的汽轮压缩机控制系统。     

Role of signal peptides in targeting of proteins in cyanobacteria

Proteins of cyanobacteria may be transported across one of two membrane systems: the typical eubacterial cell envelope (consisting of an inner membrane, periplasmic space, and an outer membrane) and the photosynthetic thylakoids. To investigate the role of signal peptides in targeting in cyanobacteria, Synechococcus sp. strain PCC 7942 was transformed with vectors carrying the chloramphenicol acetyltransferase reporter gene fused to coding sequences for one of four different signal peptides. These included signal peptides of two proteins of periplasmic space origin (one from Escherichia coli and the other from Synechococcus sp. strain PCC 7942) and two other signal peptides of proteins located in the thylakoid lumen (one from a cyanobacterium and the other from a higher plant). The location of the gene fusion products expressed in Synechococcus sp. strain PCC 7942 was determined by a chloramphenicol acetyltransferase enzyme-linked immunosorbent assay of subcellular fractions. The distribution pattern for gene fusions with periplasmic signal peptides was different from that of gene fusions with thylakoid lumen signal peptides. Primary sequence analysis revealed conserved features in the thylakoid lumen signal peptides that were absent from the periplasmic signal peptides. These results suggest the importance of the signal peptide in protein targeting in cyanobacteria and point to the presence of signal peptide features conserved between chloroplasts and cyanobacteria for targeting of proteins to the thylakoid lumen.     

CS1000在天铁烧结生产过程控制中的应用

结合天津铁厂烧结分厂二烧车间烧结过程控制的具体情况,介绍了分散型控制系统在烧结生产上的应用以及数据网上发布的一种方法。