肃北某铁矿石进入酒钢选矿流程的可行性分析

肃北某铁矿石原矿品位较高,达48％以上,但属于混合铁矿石类型,选别工艺复杂,原矿欲进入酒钢流程进行选别。为了查明该矿石对酒钢选比工艺的适应性,对其进行了焙烧磁选和强磁选选矿试验,以试验数据与酒钢矿石选别指标对比来分析其进入酒钢选矿流程的可行性。     

低品位氧化铜矿石浮选工艺试验研究

通过对某低品位氧化铜矿石进行工艺矿物学研究,进而查明该矿石的化学成分、矿物组成、嵌镶关系、粒度分布特征。并进行了浮选条件及闭路试验研究,确定低品位氧化铜矿石浮选的工艺参数,取得了铜精矿含铜达18．16％,回收率达80．03％较好的选别指标。可向同类低品位氧化铜矿石选矿提供有宜的借鉴。     

西藏某复杂难选氧化铜矿选矿试验研究

西藏拉萨地区某铜氧化率较高的氧化铜矿石结构复杂,铜的选别难度较大,为了高效的开发该矿石,笔者通过查阅相关资料,认为此类矿石采用先硫后氧工艺指标往往优于氧硫混浮工艺指标,故决定采用先硫后氧的选矿工艺对此矿石进行了系统的选矿试验。结果表明,采用两粗三精两扫的闭路流程,在原矿铜氧化率60.79%的情况下,可以获得铜品位17.47%,铜回收率63.45%的良好指标。     

光电色选机在某矿分选中应用实践及优化

针对现有的选矿工艺粗选选别中人工手选劳动力多,劳动强度高,作业条件较差等弊端,本文通过对原矿石进行粒度分析,选别初步试验,将色选机引用至选矿流程中,结果表明,矿山直接经济效益减少人工成本约180万元/a,间接经济效益减少选矿处理成本229.8万元/a,采用色选机进行分选,丢废率提高近14%,合格矿品位相应提高了16%。由此表明,采用色选机进行选别,矿山降低了选矿成本,取得了良好的经济效益和社会效益,与此同时,为类似相应工程提供了一定的技术支持与参考。     

龙山金锑矿低品位老窿残矿回收技术

在分析研究龙山金锑矿低品位老窿残矿特征的基础上,结合矿山生产实际,采用脉外平巷加穿脉群回采方案和部分优先-混合浮选工艺,综合回收低品位老窿残矿,经过1年多的生产实践证明,该项技术金锑回收率高、回采作业安全性好、经济效益显著,可为类似矿山提供借鉴。     

西藏某斑岩型铜钼矿表层矿浮选选矿技术优化

西藏巨龙铜业有限公司投产初期安装原设计选矿工艺进行生产,出现了铜、钼金属回收率较设计值偏低、铜精矿品位不达标的问题。经现场考查发现,西藏巨龙铜业投产初期处理的矿石较设计时的矿石性质差异较大,设计选取的为底层原生矿,实际处理的为表层氧化矿,且由于矿山规模大,仅处理表层矿都需要3年以上。西藏巨龙铜业选矿团队通过现场药剂制度的优化及新增再磨设备,铜回收率达到80%以上,钼回收率达到65%以上,铜精矿、钼精矿品位均达标。     

某银多金属矿的选矿试验研究

针对某银多金属矿矿物组成种类繁多、矿石性质复杂、铜铅分离不彻底及贵金属银回收率低等问题,分析了原矿矿物组成和矿石性质,并进行了详细的选矿试验研究。在给矿品位为铜0.68%、铅1.22%、锌1.47%及银74 g/t的条件下,小型闭路试验获得选矿指标如下：铜精矿中铜品位为27.22%、铜回收率为85.29%;铅精矿中铅品位为56.37%、铅回收率为85.02%;铜精矿和铅精矿中银累计回收率为86.73%;锌精矿中锌品位为53.22%、锌回收率为77.48%。与矿山实际生产对比,该工艺技术不仅药剂制度简单,流程简洁,且大大提高了银、铜和铅的选别指标。     

甘肃枣子沟金矿床原生矿选矿工艺研究及效益分析

枣子沟金矿床为一中低温热液构造蚀变型大型金矿床,其成矿严格受区域断裂构造控制。在地表氧化矿石和混合矿石开采殆尽之际,进行原生矿选矿工艺的研究十分必要。通过多种选矿工艺比较试验,该矿床原生矿石采用焙烧—氰化工艺,能达到更好地利用矿产资源和取得更加明显的经济效益目的。     

哈密市沙泉子铜铁矿矿石选矿困难的原因初探

新疆沙泉子铜铁矿选矿工作经过了先后不同企业进行选矿工作,都总结出一条沙泉子铜铁矿矿石磨矿时间长、磨矿细度不够、精矿品位达不到工业要求,产量也上不去。笔者就这一问题,从地质角度矿床地质背景、矿石矿物特征、矿石及脉石矿物硬度、粒度方面进行了分析,发现该铜铁矿石脉石矿物属于矽卡岩类,由于矽卡岩的矿物组合比较特殊,矿物硬度相对都大于磁铁矿,因此,造成磨矿时间长,磨矿细度不够,精矿品位达不到工业要求,产量也上不去的原因,最后笔者建议该铜铁矿选厂改变选矿工艺和设备配置,提高选矿效果和经济效益。     

某选铁尾矿低碱度铜硫分离试验研究

针对某选铁尾矿矿石性质,进行铜硫混合浮选,混合精矿再磨后铜硫分离的选别工艺,以乙黄药+丁胺黑药为组合捕收剂,新型抑制剂DT-4与石灰为铜硫分离抑制剂,进行铜硫浮选试验,最终获得铜品位26.68%,回收率80.39%铜精矿;硫品位47.68%,回收率74.82% 硫精矿,实现了铜硫的分离及铜硫的综合回收。     

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.