从铜转炉烟尘中综合回收有价金属

我厂铜转炉烟尘中含有多种有价金属,但品位较低。近年来,在毛主席革命路线的指引下,为了合理回收这些金属,我们以批林批孔为动力,对原有工艺流程进行了两次较大的改革。最初是用两段锌粉置换,锌粉耗量高达180(公斤/吨烟尘),尽管锌能以硫酸锌形式回收,但锌粉来源较困难。为此,后改用水解富集——P204萃取流程,通过生产实践,该流程仍不够理想,有价金属的富集倍数也不高;另外,流程的第一步     

锌粉置换及有害气体处理的研究

锌粉置换法广泛应用在稀有、稀散金属的富集、提取工艺过程。特别是在锌的湿法生产系统,常采用锌粉置换做为除杂和富集某些金属的手段。 锌精矿中常伴生有砷,尤其是经火法富     

由含锌烟尘制备高纯硫酸锌溶液的工艺研究

对锌烟尘硫酸浸出提取锌工艺条件进行了研究,分别采用正交试验与单因素试验考察浸出酸浓度、液固比、浸出时间、浸出温度对锌烟尘中锌、铁的浸出率的影响;采用针铁矿-氧化水解联合法深度除铁、过硫酸铵氧化除锰、锌粉置换除杂对浸出液净化.结果表明,较优浸出工艺条件为:硫酸浓度为1.Omol,L、液固比为7:1、浸出时间为2.5 h、浸出温度为60℃,在较优浸出条件下,锌浸出率可达97%以上;浸出液经过净化后得到高纯度的硫酸锌溶液.表明该工艺从锌烟尘中提取锌具有较好的效果.     

铅、铜冶炼烟尘中有价金属的综合回收

对铜、铅冶炼氧气底吹熔炼炉烟尘中有价金属的回收进行研究,介绍了两类烟尘有价金属回收的工艺流程,主要包括烟尘浸出后,从浸出液中回收镉、锌、铜等金属,从浸出渣中回收铅、铋等金属。     

压缩空气喷吹法制备金属锌粉的生产实践研究

针对某冶炼公司投产初期空气喷吹法制备的金属锌粉产能和粒度无法满足生产需求的问题,分别探究锌液温度、喷吹压力、石英管内径、喷嘴齿数、喷嘴加工和安装精度对金属锌粉产能和粒度的影响.结果表明,在锌液温度590～600℃、喷吹压力0.6～0.65 MPa、石英管内径12 mm、内喷嘴30齿、外喷嘴40齿的工艺条件下,锌粉产能由...     

热镀锌渣锌灰回收处理工艺评述

镀锌工业每年产生大量的锌渣、锌灰,目前对锌灰、锌渣的处理工艺按最终产物大致可分为再生金属锌锭锌粉和生产化工产品两大类,本文对这些工艺的特点进行评述。     

热镀锌渣锌灰回收处理工艺评述

镀锌工业每年产生大量的锌渣、锌灰,目前对锌灰、锌渣的处理工艺按最终产物大致可分为再生金属锌锭锌粉和生产化工产品两大类,本文对这些工艺的特点进行评述.     

电解法生产活性锌粉

采用浸出、电解从含锌物料中提取锌生产锌粉，浸出过程采用铵盐＋氨水作为浸出剂，在氨络合物体系中进行电解。与目前碱浸、电解法相比，可取消在浸出前的预脱阴离子杂质工序。浸出、电解均在常温下进行，具有流程短、金属回收率高、成本低、锌粉质量好等优点。可用于处理各类锌渣生产锌粉     

从高氟氯烟尘中富集铟的研究

国内冶炼常规湿法流程锌浸出渣生产氧化锌脱氟氯时会产生大量的烟尘,其中含有锌、铅、铟、镉、氟、氯、砷等元素。研究了该烟尘富集铟、回收锌和铅以及处理氟、氯、砷等有害元素的工艺流程。结果表明,采取适当的工艺后可以回收烟尘中的有价金属。     

优化锌粉的加入方式降低锌粉消耗

近年来,我国对镓、锗、锡等稀散有价金属的需求越来越高,但高品位矿的稀缺导致金属冶炼行业的原料质量降低,故而近年来多采用锌湿法冶炼工业在金属杂矿、混合矿中冶炼有价金属。但在工艺实施的过程中发现,在净化工艺流程中锌粉的单耗量越来越高,这也就说明企业的生产成本大幅度增加,因此,企业需要对降低锌粉单耗量的方法进行深入研究。基于此,本文主要研究的是通过优化锌粉的加入方式降低锌粉消耗,希望对相关人员有所启示。     

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.