含碳低品位难选白钨矿常温浮选试验研究

某片麻岩型白钨矿中石墨含量较高、钨品位低,以白钨矿为主,含有部分黑钨矿,钨矿物嵌布粒度细,属"贫"、"细"、"杂"难选的白钨矿。根据矿石的性质,提出"炭硫异步浮选-白钨粗选-钨粗精矿常温精选"工艺,以煤油+丁基黄药+丁铵黑药组合进行脱碳脱硫,硫脱除率从20%左右提高到86.29%,脱碳脱硫尾矿进入选钨作业。白钨矿浮选采用Na2CO3为pH调整剂,水玻璃+FeSO4为脉石抑制剂,731为白钨矿捕收剂,当原矿为WO3含量为0.157%时,获得产率0.19%,WO3品位52.72%,WO3回收率62.30%的白钨精矿。     

赣南某钨矿选矿试验研究

为合理开发赣南某钨矿新发现的资源,对该矿区钨矿石进行可选性试验研究,确定其选矿工艺流程和选别指标。针对该矿石矿物以硅酸盐、碳酸盐为主的特点,采用预先脱硫,脱硫尾矿以氢氧化钠作为矿浆p H调整剂、水玻璃作为脉石矿物的抑制剂、733氧化石蜡皂作为捕收剂常温浮选白钨矿工艺流程。最终闭路试验指标为钨精矿WO3品位为62.29%,回收率为85.65%,取得了良好的选别效果,论证了试验矿石的可选性,为今后的生产提供技术依据。     

某难选低品位钨钼共生矿石工艺矿物学研究

采用MLA技术对难选低品位钨钼矿石进行详细的工艺矿物学研究,测定了矿石矿物组成、嵌布粒度和解离度等工艺矿物学参数,为制定合理的选矿流程提供详实可靠的依据。结果表明,矿石中的主要有价矿物为白钨矿和辉钼矿;脉石矿物以石榴石(钙铁榴石、钙铝榴石)、透闪石、普通辉石、透辉石等磁性脉石为主,还有部分非磁性脉石石英、长石、萤石和方解石等。脉石矿物中富钙脉石含量较高,将对白钨矿选矿产生一定的影响。基于工艺矿物学的研究结果,选矿试验设计了强磁预先丢尾-先浮钼后浮钨的工艺技术路线,取得了钼精矿产率为0.125%,钼品位48.85%,钼回收率64.86%;钨精矿产率为0.27%,WO3品位65.23%,钨回收率74.22%的较好选矿技术指标。     

湖南某难选黑白钨矿中的白钨浮选试验研究

为解决湖南某黑白钨矿中以萤石为主的脉石对白钨浮选干扰较大的问题,对该黑白钨矿通过浮选先回收钼、铋硫化矿,浮选尾矿经弱磁除铁,然后弱磁选尾矿经高梯度磁选机磁选得到的非磁产品作为白钨给矿(WO3 0.33%)进行浮选,采用调整剂TT+水玻璃和新型捕收剂TAB-3进行白钨矿粗选、NT+水玻璃进行白钨加温精选、白钨加温精矿经酸浸后取得品位为72.59%WO3,WO3回收率为70.64%的白钨精矿。     

某金矿浮选尾矿综合回收钨试验研究

某金矿浮选尾矿中WO 3品位为0.23%,含钨矿物主要为白钨矿,偶见黑钨矿。针对其性质特点,开展了综合回收钨的试验研究。结果表明:采用一次粗选、两次扫选、五次精选闭路流程,可获得钨精矿WO 3品位为43.01%,WO 3回收率为86.98%的良好浮选指标。研究结果为该黄金矿山回收利用浮选尾矿中的钨资源提供了技术依据。     

某低品位黑白钨共生矿选矿工艺研究

某低品位复杂难选黑白钨矿矿物共生关系密切,嵌布粒度细,矿石性质差异性大,获得较好的技术指标较难。分别采用"磁-浮"黑钨白钨分类浮选选矿工艺和"浮-磁-浮"白钨优先浮选选矿工艺对该矿石进行选矿研究。"磁-浮"黑钨白钨分类浮选选矿工艺可获得品位72.59%,回收率30.15%的白钨精矿和品位55.36%,回收率47.81%的黑钨精矿,钨总回收率77.96%。"浮-磁-浮"白钨优先浮选选矿工艺获得WO3品位74.57%、回收率72.90%的白钨精矿和WO3品位28.88%、回收率8.48%的黑钨精矿,钨总回收率为81.38%。     

复杂难选黑白钨矿粗细分流同步选别新工艺

根据中国黑白钨矿资源原矿品位低、矿物种类多、嵌布粒度细、部分矿石蚀变风化泥化严重、综合利用率低、有效分选困难的特点,研究开发了粗细分流、分级重选、细泥浮选新工艺,结合新型高效组合捕收剂、新型离心选矿机的应用,成功回收了黑白钨矿,解决了粗、细粒不均匀嵌布复杂难选黑白钨矿回收技术难题。当原矿品位WO30.31%时,取得了粗粒钨精矿品位WO358.49%,钨回收率61.93%及细泥钨精矿品位WO326.23%,钨回收率15.02%的工业试验结果,钨总回收率为76.95%。     

重选抛尾在细粒嵌布型黑白钨矿选别中的应用

江西北部某品位低黑白钨属难选矿石,采用全浮工艺回收成本高、WO3回收率低。针对该矿的矿石性质,采用重选+浮选联合工艺流程,获得了较好的技术指标。数据显示,原矿WO3品位为0.243%,重选抛尾率50.336%、WO3的损失率为10.54%;获得WO3品位55.149%的重选钨精矿、重选WO3回收率33.56%;重选+浮选WO3总回收率为76.54%,为该钨矿大规模开发利用提供了设计依据。     

某白钨矿浮选尾矿综合回收微细粒级白钨试验研究

某白钨矿选矿厂日处理原矿2 000 t,排出尾矿有1 800多t,其尾矿资源回收有着重要意义。根据该矿山选矿尾矿中白钨矿呈微细粒嵌布特点,确定试验方案为常温粗选-加温精选的浮选工艺流程,添加调整剂使细粒级的矿物和脉石矿物分离,采用捕收能力较强的改性脂肪酸回收微细粒级白钨矿。进行了调整剂、捕收剂的种类和用量试验等,在最佳条件试验的基础上进行了闭路试验。对WO3品位0.05%的给矿,得到精矿品位65%和回收率25%的小型闭路试验结果。试验的研究为该矿山尾矿中微细粒级白钨矿的综合回收提供了依据。     

某难选白钨矿浮选工艺及流程试验研究

某矽卡岩型白钨矿有用矿物白钨嵌布粒度细,萤石、方解石等含钙矿物含量高,属于高含钙矿物的细粒难选白钨矿石.现场生产采用单一捕收剂及脉石抑制剂,白钨精矿质量及回收率均较低,为提高该白钨矿的选矿指标,进行了该矿石的大量工艺条件及工艺流程试验,结果表明：矿石经全浮脱硫后,采用水玻璃和六偏磷酸钠为脉石的组合抑制剂,油酸钠和731为白钨的组合捕收剂,经一粗三扫一精的闭路流程获得白钨粗精矿;粗精矿经过浓缩加温后,再经过一粗三扫五精的闭路流程浮选,获得了白钨精矿品位为65.16%,回收率为76.49%的较好的选矿指标,可为现场生产提高指标提供技术依据.     

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。     

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。     

Comparison of the results of surgical and conservative treatment of fractures of the diaphysis of the tibia

In this paper is treated the fundamental problematic of the fracture of the diaphysis of the tibia and the therapeutic results after the conservative and operative treatment are confronted. Among 518 patients with 433 open fractures and 35 with closed fractures of the diaphysis of the tibia, successful treatment of more 2/3 was obtained in the period from 1968 to 1972. Following our casuistics and literature, whose results are similar, we find out that the average total treatment of the osteosynthesis of the fracture of the diaphysis was shortened for 2,5 months depending upon the type and the localisation of the fracture. Apolied methods of the operative and conservative and conservative treatment in relation to the velocity of the medical cure as well as to the extreme anatomical-functional results are analised. We noticed that osteosynthesis, made by the intermedullary nail and the extension of the canals or by a small AO table, by the achieved stability makes conditions of immediate motions and an early rehabilitation. Because of that it gives the best functional results.     

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.     

参与式农业基地建设行动方案设计

为了编制实用性强的基地建设行动方案,首先,确定参与式发展的主体,搭建一个"决策框架";其次,针对行动目标,提出不同参与主体,如管理者、农民、消费者等团队与个人的目标及行动内容;最后,工作应向重塑伙伴式合作关系,挖掘农民自我发展潜力,完成三大角色的转换,打造农业基地文化等方向推进.