铅锌选矿废水处理及循环回用技术研究

试验研究了铅锌选矿废水的处理方法,并对处理后的废水进行了选矿回用试验,研究表明某铅锌矿选矿废水经“混凝—氧化—吸附—曝气”处理后,水体各项指标达到排放标准,回用于选矿系统对选矿指标基本无影响,每立方废水药剂成本低至0.74～0.8元,极大降低了处理成本,具有较大的推广价值,可为铅锌矿选矿废水达标排放与循环回用提供参考。     

某铅锌矿选矿废水的治理与回用试验研究

某铅锌矿选矿废水成分复杂,含有多种重金属离子,且富含多种残余选矿药剂,废水中S2-、COD cr、pH、Pb2+、Zn2+等指标超标。直接回用对选矿指标影响很大,直接排放会对生态环境产生很大的影响和污染。试验依据该选矿废水特点和选矿工艺要求,采用"混凝沉淀—酸碱中和—氧化—澄清"的废水处理工艺,对该选矿废水进行治理,处理水水质达到污水综合排放标准一级标准。通过对选矿药剂制度的创新和选矿工艺的优化,选矿废水处理后成功地进行了回用,实现了零排放。     

那能金矿低品位原生矿石处理工艺的比较分析

那能金矿低品位原生矿石金品位约1.5 g/t,根据矿石性质,对4种选矿工艺进行了探索试验.根据试验指标对4种选矿工艺进行比较分析,认为原矿堆浸生物氧化—搅拌氰化浸出工艺,较适用于处理那能金矿低品位原生矿石.     

某长石非金属矿选矿废水处理及回用试验研究

某钠长石非金属矿选矿废水成分复杂,含有多种残余浮选药剂和重金属离子,其中pH、CODcr、F~-等指标超标,无法满足直接回用和排放。试验研究提出了"除F—混凝—氧化—沉降—回用"的处理与回用工艺。结果表明:经过连续6次闭路循环回用试验,水质指标稳定,浮选结果与清水相近,回用技术可行,实现了选矿废水零排放。     

某钨矿选矿废水处理及回用试验研究

某钨矿选矿过程中加入了大量硅酸钠和其他浮选药剂,造成了尾矿沉降缓慢,选矿废水黏度大,废水中TAs、COD_(Cr)等指标超标无法外排等问题,而且将此尾矿澄清水回用到选矿中,浮选指标严重恶化。针对此问题,本文对该钨矿选矿废水进行了脱稳除硅试验和除砷降COD_(Cr)试验,试验结果表明,"石灰沉淀-铁碳微电解-吸附材料吸附"工艺处理该钨矿选矿废水效果明显,处理后的废水后液中TAs与COD_(Cr)指标均可达到国家地表水Ⅱ类水质标准,将其返回选矿流程,选矿指标接近清水指标。     

铜铅锌选矿废水处理及回用技术研究

研究了铜铅锌选矿废水的处理方法,并对处理后的废水进行了选矿回用试验,为铜铅锌矿最终实现选矿废水零排放提供参考。研究结果表明:选矿废水经"碱式铝絮凝沉淀过滤-二氧化氯氧化-调节"处理后,可回用于选矿系统,对选矿指标基本无影响。     

某铅锌矿选矿废水的治理与回用试验研究

某铅锌矿选矿废水成分复杂,含有多种重金属离子、多种残余选矿药剂,废水中SS、CODcr、pH、Pb^2＋、Znb^2＋等指标超标。直接回用对选矿指标影响很大,直接排放会对生态环境产生很大的影响和污染。试验依据该选矿废水特点和选矿工艺要求,采用“混凝沉淀-酸碱中和一氧化-澄清”的废水处理工艺,对该选矿废水进行治理,处理水水质达到污水综合排放标准一级标准。通过对选矿药剂制度的创新和选矿工艺的优化,选矿废水处理后成功地进行了回用,实现了零排放。     

矿山采场废水应用于硫铁矿选矿试验研究

采用硫铁矿矿山采场酸性废水和新水进行了硫铁矿选矿对比试验.试验结果表明,酸性废水可调整矿浆至选矿适宜pH值,选矿指标及后续废水处理均不受影响,可直接用于硫铁矿选矿,为采场酸性废水应用于硫铁矿选矿提供了技术依据.     

郴州新星选厂选矿废水处理与重复利用研究

本文简述了某小型铅锌矿选厂废水处理和回用试验情况。选矿废水采用硫酸一聚铁法处理可达污水综合排放标准（GB8978—88）。尾矿库溢流水回用选矿工艺，选矿指标不受影响，选矿药剂费用减少，每年节约新水16万t，具有较大的经济效益与环境效益。试验成果已在工程中应用。     

二道河硫化铅锌矿废水分步处理与回用工艺方法探讨

研究提供了一种铅锌矿废水处理及利用技术,通过分析各处废水水质,结合选矿对水质要求,有针对性处理、回用,解决了废水回用影响选矿指标及外排污染环境的问题,既保证废水零外排,又不影响选矿指标且投资少、费用低。为硫化铅锌矿矿山废水分步处理及分质利用工艺提供了整套矿山废水处理和循环使用方法。     

转炉炉壳热应力分析

根据实际转炉建立实体模型。以有限元为手段,考虑了炉衬和炉壳材料的物性参数随温度变化的特点和炉衬与炉壳之间膨胀间隙,计算了转炉炉壳在温度载荷和炉衬膨胀压力同时作用下的热应力。所得结果可为转炉炉壳设计提供依据。     

焦炭热性能指标意义浅析

通过对焦炭在高炉内的历程及其变化规律的剖析,阐述焦炭热性能指标的意义,形象地把焦炭在高炉内的损耗分为三部分(M1,M2,M3)。指出M2对焦比及焦炭价格有一定的指导作用。     

Results of treatment of cancer of the cardia

Cancer of the cardia is traditionally discussed with cardiac cancer of the lower portion of the esophagus and upper gastric cancer invading the esophagus, and the specific characteristics of cancer of the cardia have never been clearly defined. We reviewed the outcome of 172 patients with adenocarcinoma of the cardia who had undergone radical surgery between 1949 and 1994 in the Division of Gastrointestinal Surgery of the Cancer Institute Hospital. The centers of the tumors were located within 2 cm above and below the boundary between the esophagus and the stomach, and their longitudinal diameter was less than 8 cm. We divided the patients into an early period (1949-1979; n = 79) and a late period (1980-1994; n = 93), and focused on the historical transition. There were no differences in patient gender or histology between the two periods. However, the late period was associated with fewer cases of esophageal invasion and shorter longitudinal diameter, as the age of the population advanced. The number of advanced cancers such as the localized and infiltrative type had decreased, and early cancer and early clinical stage had become more common, but despite the fact that the number of early cancers had increased, extended dissection, such as thoracic and paraaortic lymph node dissection, was performed more frequently. By clinical stage, the long-term outcome markedly improved in Stage I patient in the late period, and tended to improve in Stage II and III patients. This appears to have been attributable to the prevention of micrometastasis by extended dissection, although the number of early cancers is another major potential cause. There were no differences in the outcome of Stage IV patients between the two periods, and further advances in multimodality therapy must be awaited. The range of resection is basically proximal gastrectomy, and if there are adequate indications, the prognosis is favorable. In view of the status of lymphatic flow and lymph node metastasis, and long-term results, lateroaortic lymph node dissection is important. Since the number of early cancer patients has been increasing, if intraabdominal recurrence is prevented, intrathoracic lymph node dissection will contribute greatly to the outcome of such patients.     

The effect of amount of possession of the trait of hostility on accuracy of perception of hostility in others.

Some theories of personality hold that an individual's perception of others is influenced by his own personality characteristics; more specifically, that a trait of low social value will be projected more into others, and that insight into the possession of these characteristics reduces this distortion. These 2 hypotheses were tested by having a group of college students rate each other (including themselves) on degree of friendliness or hostility. Agreement with group rating about self yielded the insight score. In general, the hypotheses were supported; the "friendly" Ss were most accurate in their perception of others, and insight was positively associated with accurate perception. From Psyc Abstracts 36:04:4HL16M. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Comparison of rates of infection of two methods of emergency ventricular drainage

The rates of infection of two methods of external ventricular drainage in use at Atkinson Morley's Hospital--namely, (a) percutaneous drainage with Rickham reservoirs and (b) tunnelled ventriculostomies--were compared in this retrospective review. Percutaneous drainage of CSF with Rickham reservoirs was associated with a 27% rate of infection as identified by positive microbiological cultures; tunnelled ventriculostomy catheters had a 10% infection rate. The difference in the infection rate between the two methods was statistically significant (P < 0.015). Other variables examined, including the age and sex of the patients and the reasons for ventricular drainage, were not associated with an increased rate of infection. Most infections from either method were caused by a coagulase negative staphylococcus. The average duration of ventricular drainage before identification of positive cultures was 5.7 days for Rickham reservoirs and 6.0 days for ventriculostomies.     

浅析《野草》的版画特征

鲁迅先生一生热爱美术作品,对版画中木刻兴趣尤甚.<野草>作为其"写心之作",亦呈现出一些与木刻版画一致的审美特征:一是具有木刻版画的色彩特征,多对比、多冷色,有阴郁的美感;二是具有木刻版画的力度特征,环境描写、人物刻画处处刀锋毕现,遒劲有力,有一种"力之美".     

四辊破碎机车刀架的改造

针对四辊破碎机车刀架车削中存在的几个问题,详细介绍了电动车刀架的结构和工作原理,建立主要设计参数的数学表达式,并进行适当的分析。改造后,这种电动车刀架运行平稳、可靠、方便、省力,取得了预期的效果。     

Effect of antibiotics of chemotaxis of human leukocytes

The effect of 20 different antibiotics on chemotaxis by human neutrophils was studied. Human leukocytes incubated with chloramphenicol, rifampin, sodium fusidate, and tetracyclines in vitro showed markedly depressed migration. The mechanisms by which these antibiotics affect leukotaxis are discussed.