提高贵冶金银回收率生产实践

江西铜业集团贵溪冶炼厂(简称贵冶)是以铜冶炼为主,兼顾金银等稀贵金属提取的现代化大型炼铜企业。文章对铜冶炼生产工艺过程中影响金银回收率的因素以及各环节中金、银的损失情况进行了分析,详细介绍了贵冶在提高金银回收率方面从原料取样、制样以及配料管理、生产工艺过程优化等方面采取的措施。     

提高武山铜矿伴生金银指标试验研究

介绍了武山铜矿伴生金银工艺矿物学特性,对伴生金银回收工艺流程进行了试验研究和探索,通过多方案选矿试验比较,最终确定采用优先浮选铜-中矿再磨工艺流程和高效捕收剂,较好地解决了武山铜矿伴生金银回收率偏低问题,对提高武山铜矿伴生金银回收率具有现实指导意义。     

用细菌强化金银的硫脲浸出

印度的 Mydrometallugy 用细菌强化硫脲从铅—锌硫化矿浮选尾矿中浸出金与银。他们研究了生物浸出对提高金银回收率的影响。采用硫脲代替传统的氰化物作提取金银的浸出剂。获得的实验结果表明,铅—锌浮选尾矿的生物预氧化在提高后来的硫脲浸出的金银回收率方面是极有用的。细菌硫脲浸出产生的金银回收率分别为92%和78%,而浮选尾矿的直接硫脲浸出分别为23%和45%。     

德兴铜矿北山伴生金银赋存状态及富集特征的研究

本文对德兴铜矿钢厂矿区北山不同区段、不同蚀变岩带和不同矿石类型中伴生金银的赋存状态及富集特征等进行了系统总结,对金的矿化控制因素、成矿阶段及其作用过程进行了初步探讨.对提高矿山伴生金银的综合利用程度及其选矿回收率,具有一定的指导作用.     

氧化铋渣综合回收试验研究

采用磨矿水洗脱碱，盐酸、氯化钠浸出，水解沉铋，置换沉铜工艺处理氧化铋渣，铜铋的浸出率９８％以上，铜铋精矿回收率９８％以上．浸出渣中金银回收率分别在９９％和９７％以上，浸出渣中贱金属品位大大降低，便于返回火法系统回收金银．工艺流程简单，易于实施，是铜铅阳极泥火法冶炼实现铋开路，回收铋的有效途径。     

从贵铅转炉衬砖中回收金银的选冶联合流程

贵铅转炉炉衬镁砖经破碎和摇床选别,产出富含金银的精矿,而后利用试验设备,经湿法流程处理,提炼金银和铜铋。见效快、金银回收率高、收益好。     

提高红透山铜矿金银回收率研究

本文叙述该矿伴生金银回收现状查找原因,采取相应对策,提高金银回收率,增加企业后劲,进一步增加经济效益,具有重大意义。     

防止金银流失重视资源利用

铜冶炼厂的副产品,黄金、白银的回收率,它分铜电解的阳极泥回收率,金银冶炼回收率,二者合之为铜冶炼厂金银的总回收率。     

棒磨机在精矿样品加工中的应用和改造

为了一步提高铜精矿样品加工的粒度,确保100%自由通过180目标准筛,为下道工序化验分析提供合格样品,降低化验分析离散程度,提高铜精矿金银分析准确率,保障工厂金银回收率,贵冶原料部通过技术交流、设备更新等措施引进新型设备替代普通制样机,提高工作效率,提高样品加工质量,改变目前制样设备无法满足样品加工粒度的现状。并对棒磨机使用过程中存在的问题和不足进行了系统改造,确保棒磨的应用完全符合检验工作的需要。     

金银精炼系统铂钯回收工艺改进实践

针对某厂金银精炼系统铂钯回收率低、随银粉损失严重等问题进行技术创新与工艺改造。通过采取银电解液铂、钯吸附富集,改进金精炼过程铂钯回收工艺等技改措施,使铂、钯回收率由原工艺的20%左右提高至90%以上,经济效益显著。     

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.