氧化铜矿浮选研究进展

详细评述了氧化铜矿的浮选方法与工艺及浮选药剂研究进展, 指出强化硫化过程、硫化质量和寻找具有高度选择性的捕收剂是其重要的研究方向。      

内蒙古某低品位氧化锌矿浮选试验研究

针对内蒙古某低品位高氧化率混合锌矿的特点,采用先硫化锌浮选-后氧化锌浮选工艺进行了试验研究,其中氧化锌浮选采用硫化-胺法工艺。结果表明,在不脱泥,磨矿细度-0.074 mm 75%,经硫化矿优先浮选,获得硫化矿锌精矿品位59.89%,锌回收率32.92%;氧化矿硫化胺法浮选获得锌精矿品位32.40%,锌回收率28.01%,有效实现了低品位氧化锌矿的浮选。     

从某硫化矿浮选尾矿中回收白钨的研究

对某硫化矿浮选尾矿采用石灰浮选法粗选，浓浆加温搅拌法精选浮选白鸽，成功地进行了白钨矿与萤石、方解石等脉石矿物的分离，获得了国标一级白鸽精矿，钨总回收率达82.93％。     

难选氧化铅锌矿石铅浮选工艺研究

针对云南某难选氧化铅锌矿石性质复杂,铅氧化率高,锌回收价值低等特点,进行了铅矿物硫化-黄药法浮选、脂肪酸直接浮选工艺对比。结果表明:相较硫化-黄药法浮选铅精矿铅品位55. 62%、铅回收率75. 45%,脂肪酸直接浮选工艺整体选矿指标更佳,铅精矿铅品位50. 38%、铅回收率78. 08%;且脂肪酸直接浮选工艺具有添加药剂种类少、用量小、选矿成本低等优势,选矿药剂成本比硫化-黄药法浮选低36. 64元/t。脂肪酸直接浮选工艺更适宜于处理该难选氧化铅锌矿石。     

铜锌硫化矿浮选分离研究进展

概述了近几年来铜锌硫化矿浮选分离研究方面的进展,包括铜锌硫化矿分离理论研究的进展、铜锌硫化矿浮选药剂的研究现状及铜锌硫化矿浮选工艺研究状况。同时认为,加强浮选理论的研究、开发高效绿色浮选药剂、完善选矿工艺流程及开发新工艺是铜锌硫化矿浮选分离研究的发展方向。     

含银硫化矿物浮选剂

本文介绍黑药类、硫醇类、炔基化合物等含银硫化矿物捕收剂及含银硫化矿浮选过程使用的抑制剂,然后用络合物化学原理、软硬酸碱化学原理、溶解度积浮选理论探讨它们与含银硫化矿物作用机理,最后在结语中提出含银硫化矿物浮选剂研究方向。     

孔雀石硫化焙烧-浮选的研究

本文从冶金-选矿联合流程的角度出发,对孔雀石硫化焙烧产物的浮选行为进行研究,确定硫化焙烧条件,并以孔雀石和石英混合样的硫化焙烧-浮选来验证硫化焙烧-浮选工艺在理论上的可靠性,从而为这一新工艺提供一定的理论依据。     

含金硫化矿无捕收剂浮选的试验研究

本文从含金硫化矿浮选过程的根本特征出发，阐述了对含金硫化矿无捕收剂浮选的可能性，说明利用无捕收剂浮选与有捕收剂浮选金的技术指标相一致，并且无捕收剂浮选指标稳定可靠，药剂配方简单。     

硫化矿浮选抑制的电化学研究

电位对硫化矿浮选的影响,容易导致基于电位控制选择性抑制硫化矿浮选的设想。循环伏安曲线、徽分电容测量等电化学方法研究抑制机理。本文讨论硫化矿浮选抑制的三种电化学机理:选择性捕收剂选择;硫化矿表面金属捕收剂盐的阳极氧化分解;以及硫化矿表面捕收剂二聚物的阴极还原解吸。     

氧化锌矿浮选研究现状与进展

简要介绍了国内外氧化锌矿浮选工艺和浮选药剂的研究现状及它们的优势和缺点,着重介绍了氧化锌矿强化硫化新工艺的研究,分析认为研究新型高效氧化锌矿浮选药剂、采用硫化焙烧-浮选新工艺将是未来处理难选氧化锌矿的发展方向.     

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。     

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.     

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。     

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.