徐阳河金矿金赋存状态及成因探讨

文章对甘肃省两党县徐阳河金矿矿石中金的赋存状态及矿石特征进行了论述,徐阳河矿石结构构造较简单,属于单纯金矿石,黄铁矿是组成该金矿石的主要金属矿物,自然金主要为粒间金和裂隙金,金主要以板片状、星点状、细脉状、不规则状、枝杈状分布于黄铁矿中,呈稀疏侵染状细粒分布。矿体受特定层位和断裂控制,根据金矿床产出的大地构造环境、矿物共生特点等分析,认为徐阳河金矿为沉积-热液改造型金矿床。     

山东某金矿工艺矿物学及选矿影响因素研究

山东某金矿金品位为1.4 g/t,属于低品位金矿。为有效回收该金矿中有价金属,对矿石进行工艺矿物学研究。研究结果表明,矿石中部分金矿物以自然金形式存在,部分金矿物以黄铁矿等硫化矿物为载体的包裹金形式存在。其中,以磁黄铁矿为载体的金矿物,由于单体解离度较低,天然可浮性较差,难以通过浮选回收,是导致金矿物损失的主要原因。实现以磁黄铁矿为载体的金矿物综合利用,有助于进一步提高金回收率,对该金矿进行浮选和尾矿磁选联合试验。试验结果表明：增加磨矿细度,可有效提高有用矿物单体解离度;浮选试验可将浮选尾矿中金、硫品位分别降低至0.35 g/t、0.48%;尾矿磁选作业可以将尾矿中金、硫品位分别降低至0.14 g/t和0.20%。研究结果可为同类型金矿床的开发和利用提供借鉴。     

缅甸实皆省某金矿工艺矿物学研究

为了查明缅甸实皆省某金矿工艺矿物学特征,采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)和化学分析等技术手段,系统研究原矿化学组成、矿物组成、粒度分布、金物相、单体解离度和矿石结构构造。结果表明:(1)原矿金品位为5.13×10-6,为主要有价元素。(2)矿石具自形晶粒结构,块状、斑杂状和浸染状构造,矿物组成简单。其中,金属矿物主要为黄铁矿,含少量黄铜矿、磁铁矿和斑铜矿,脉石矿物主要为石英、斜长石、方解石、绿泥石和白云母。(3)矿石中金易单体解离,重矿物中金分布率为3.94%,以单体金形式存在,金成色较好(大于93%),呈角粒状、块状、片状和圆片状;非重矿物中大部分金也已单体解离,游离金分布率为92.68%,包裹金分布率为3.38%。(4)细粒级矿石中金的单体解离度也比较高,-0.074 mm粒级中单体金含量为98.72%,连生体金含量为1.28%,各粒级中金的富集现象不明显。因此,重选-全泥氰化、浮选和重选-浮选等工艺均能有效回收矿石中金。     

料洞贫金矿的堆浸处理

矿石类型为破碎带角砾状和细脉浸染状含金黄铁矿石英脉矿石。金属矿物以黄铁矿最多,其次有毒砂、褐铁矿、自然金等。脉石矿物以石英和绿泥石为主。自然金常呈不规则的它形粒状、片状和细脉状散布于压碎石英脉中,最大粒度可达5毫米,一般为0.1毫米以下,其中占总金量的30％～40％以微细     

青海红土沟金矿床地质特征与找矿标志探讨

红土沟金矿床位于中祁连地块与北祁连褶皱带的分界断裂中,出露地层主要有中寒武统和下奥陶统阴沟群。通过研究金矿体的赋存位置、状态以及观察镜下矿物特征,总结该区金矿床的地质特征和找矿标志,对下一步找矿具有重要的指示意义。该区金矿体均产于下奥陶统阴沟群中基性火山岩组第二段内,主要岩性有安山质玄武岩、绢云母石英片岩、黑云斜长变粒岩及部分变砂岩、大理岩等。矿体沿NW或近EW向断裂及其附近的蚀变破碎带分布,呈似层状、透镜状和脉状产出。金矿床矿石矿物主要为毒砂和黄铁矿,含微量自然金及自然银。脉石矿物主要有绢云母、白云石、白云母和石英。金品位变化较大,毒砂、黄铁矿是金的富集及载体矿物,金矿化与砷、硫金属矿物及硅化密切相关。金主要以次显微金形式存在（矿石中含量＞90%）,其次以自然金形式存在。矿石构造类型以浸染状为主,脉状构造次之。     

坦桑尼亚PL7184金矿床矿石特征与金的赋存状态

PL7184金矿床位于环维多利亚湖金矿成矿区的马巴莱—布洪古基拉绿岩型金矿带上，对其矿石特征及金的赋存状态进行研究，有助于指导矿石选冶工艺及流程优化。通过野外地质观察、光薄片鉴定、电子显微镜和电子探针分析等技术方法，对该区金矿床矿石特征和金的赋存状态进行了系统研究。结果表明：金矿体主要赋存在条带状含铁建造岩层与酸性火山沉积岩层间的剪切破碎带内，区内金矿石划分为稠密浸染状黄铁矿化金矿石、稀疏浸染状黄铁矿化金矿石、细脉状黄铁矿化金矿石和含星点状黄铁矿化金矿石4种自然类型，其中稠密浸染状黄铁矿化金矿石含金性最好。金矿物的种类以银金矿为主，有少量自然金；金矿物的赋存状态以粒间金为主，其次为包裹金和裂隙金，金矿物粒度以中细粒为主，粒径多在0.01~0.07 mm之间。     

安徽省祁门县廖家金矿地质特征及成矿条件分析

祁门县廖家金矿赋存于中元古代环砂组(Pt2h)片理化黄铁矿化(含毒砂)千枚状岩屑砂岩、千枚岩等蚀变岩中,矿石矿物主要为毒砂,少量黄铁矿,微量黄铜矿、闪锌矿,偶见自然金,矿石结构主要是它形粒状结构、碎裂结构,构造以浸染状构造为主,细脉状构造次之,矿石类型为蚀变岩+含金石英脉型。主要矿体产于大背岭北东东向断裂(F2)上盘及其碎裂带中,矿体多呈条带状,顶底板均为黄铁矿(含毒砂)化千枚状粉砂质板岩。通过成矿条件分析,认为F2断裂具有多期活动特征,成矿热液沿该断裂运移并富集成矿,是金矿的成矿有利地段。     

西秦岭寨上特大型金矿床成矿作用及成矿模式研究

寨上金矿是微细浸染型金矿床。金的赋存状态有3种类型：一是呈微细粒包体或类质同像替代形式存在于载金矿物中;二是呈微细粒分布在碎屑粒间;三是呈微细粒分布在石英、方解石脉的晶粒间。载金矿物黄铁矿具有特征的增生环带;原生矿石类型主要有浸染状和细-网脉状,极少量的块状矿石。矿床类型有细-中等浸染状破碎带型、细-网脉型。流体包裹体研究表明,成矿流体具有中低温、低盐度、低密度和多期次活动的特点,成矿压力较低,成矿深度较浅。由矿区金的赋存状态、载金矿物的增生环带、矿石类型、矿床类型、流体组成及性质,得知寨上金矿成矿受构造-流体双重作用,由此建立了成矿模式,即浅源和深源成矿物质混合形成成矿流体→成矿流体分异（分层）→先后依次贯入（渗透）→形成脉状（浸染状）矿石（体）。     

某金矿石工艺矿物学研究

针对某金矿石样品,利用BPMA型工艺矿物学参数自动分析系统,对矿石的化学成分、矿物组成,金矿物嵌布特征、解离度等影响金回收的矿物学因素进行了系统的工艺矿物学研究。结果表明:矿石中金属矿物主要有黄铁矿、黄铜矿、方铅矿、闪锌矿等;脉石矿物主要有石英、绢云母、长石等;金矿物主要以自然金和银金矿形式存在,粒度以粗粒金为主,嵌布状态以单体金为主。研究结果对矿石分选工艺流程的制定具有指导意义。     

贵州兴仁县太平洞金矿金的赋存状态研究

通过高倍显微镜和电子探针波谱对灰家堡金矿矿集区的又一个重要矿床——太平洞金矿的金矿石进行分析,结果表明金主要呈自然矿物相形式存在,主要载金矿物为黄铁矿和毒砂。金粒主要为不规则粒状和尘点状,其次为圆粒状、角粒状和条状等,粒径在14～0.2μm之间,多数在6～0.4μm之间,属微细—次显微金。物相分析显示,硫化物包裹金占86.37%、游离金占6.03%。脉石矿物中的金则以极细状赋存在黄铁矿裂隙中。     

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.     

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。     

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.