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当前,全世界有32个国家和地区产钨,钨矿山的分布遍及每一个大洲。主要产钨国家除我国外,还有苏联、美国、玻利维亚、朝鲜、南朝鲜、澳大利亚、泰国、加拿大等。自七十年代以来,国外钨矿山的勘探与建设速度加快,不断有新的矿山投产,矿石产量有较大增长。另一方面,国外钨矿山的规模都比较小,而且绝大多数为地下开采。 相似文献
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针对国家保护性特定开采矿种--钨矿,国土资源部近几年来采取了一系列宏观调控措施,产生的效果开始显现:钨矿山采矿秩序明显好转,生产总量基本得到控制,钨精矿价格稳步上升。通过对钨矿山的治理整顿,特别是自2002年以来国土资源部实行的重新换发采矿许可证、公布具采矿资格的钨矿山名单、 相似文献
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《中国钨业》2001,16(3)
国有大中型钨矿山矿产开发管理
工作座谈会在湖南郴州召开
文献标识码:D
6月28~29日,由中国钨业协会、国土资源部矿产开发管理司联合召开的国有大中型钨矿山矿产开发管理工作座谈会在湖南郴州举行。会议传达了国土资源部南方七省 (区 )钨矿和稀土矿开发管理工作座谈会精神和蒋承菘副部长的重要讲话。中国有色金属工业协会、中国矿业联合会、国土资源部开发司、湖南省国土资源厅、江西稀有稀土金属钨业集团公司、湖南有色金属工业总公司、中国有色金属工业广州公司、郴州市地矿局的领导和代表到会并作了重要讲话。参会的 16个国有钨矿山代表对进一步贯彻落实 523号文、 80号文,搞好钨矿山开发管理工作,以及钨矿企业开采资格认证工作提出了很好的意见和建议。这次会议对加强钨矿山的治理整顿和开发管理工作具有重要的意义。
国土资源部开发司王宗亚副司长在座谈会上指出:
一、由中国钨业协会将国有钨矿山矿区内“矿中办矿”情况调研、汇总分析后,报国土资源部。
二、由中国钨业协会负责提出 2002年钨矿开采总量和指标分配的实施方案,报国土资源部。
三、钨矿山要重视生产勘探工作,延长矿山服务年限。
四、钨矿山要重视矿山资源的保护和合理利用,重视矿山环境的综合治理。
五、钨矿山要利用国家现有的一些政策,为企业服务。例如:国家征收的矿产资源补偿税,其中的一部分可用于企业技术改造和资源合理利用,企业可通过申请得到。
中国钨业协会秘书处 相似文献
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Degradation of Extraction from Seaweed and Its Complex with Rare Earths for Organophosphorous Pesticides 总被引:1,自引:0,他引:1
On the basis of several experiments carried out in China, it was proved that both seaweed liquid fertilizer and rare earth (RE) could promote the growth of crops and increase their yield. The effects of extraction from seaweed and its complex with RE on the degradation of organophosphorous pesticides and the yield of vegetables were investigated. The resuits showed that the extract and its complex with RE could degrade organophosphorous pesticides in neutral solvent. The residues of the pesticides treated by the extract decreased by 96.88 %, 52.30%, 49.52%, and 22.88 %, respectively, for chlorpyrifos, dichlorvos, omethoate, and dimethoate, and those by the complex decreased by 95.99%, 54.23%, 48.79%, and 25.66%, respectively, when compared with the control. The residues of chlorpyrifos and dimethoate in spinach sprayed with the complex were decreased by 90.64% and 76.56%, respectively, compared with those in spinach from control plots when the interval between spraying and sampling was 8 d. The fresh weight of brassica chinensis and cabbage increased by 28.62% and 18.72%, and their dry weight increased by 44.49% and 14.74%, respectively, compared with those of the controls. The chlorpyrifos and dimethoate residues in brasscia chinese were decreased by 36.36% and 50.00%, respectively, and their rate of decrease in cabbage was 40.00% and 75.00%, respectively, on 5th day after spraying with the complex, when compared with those in the vegetable from control. These results suggest that this complex can increase the agricultural productivity and reduce the use of pesticide residues in the production of vegetables. 相似文献
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在1/5万察哈尔右翼前旗等四幅区域矿产地质调查的基础上,通过化探系统采集样品、地质填图和综合找矿方法发现了桦树沟金矿,并对金矿成矿提出了新的认识。野外地质研究发现,桦树沟矿区NE、近EW向断裂控制着异常展布及地表构造蚀变带和铁锰矿化体的延伸,围岩及矿化蚀变主要有硅化、钾化、绢云母化及沿裂隙充填的铁锰矿化和褐铁矿化。运用综合找矿方法筛选找矿靶区,将桦树沟异常面积从28.8 km2缩小到3.6 km2,有助于更好地找寻金矿床。采用水系沉积物和土壤测量方法对矿区异常元素进行了测试,并根据富集系数讨论富集成矿问题,结果显示:与成矿关系密切的桦树沟岩体强富集元素有Ag、Pb、Zn、As、Sb、W、Bi和Mo等,其围岩集宁岩群富集-强富集元素有Ag、Pb、Au、Cu、As、Sb、W和Mo等,表明岩浆活动为成矿提供了含矿热液,而热液又与围岩发生交代,导致金银等多金属在成矿有利部位富集成矿。结合1/1万地质填图、1/1万土壤测量等方法进一步开展异常检查评价,发现多个样品含量已达矿石边界品位,异常浓集中心及分带明显,经探槽工程揭露并圈定出2条金矿体,其分布特征、物质组成和控矿因素已基本查明,表明该区具有良好的找矿前景。 相似文献
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针对高炉炼铁过程中的数据缺失问题,提出以单维结合多维的系统化数据填补模式。总结并阐述数据缺失填补办法的发展现状以及优劣势比较。在此基础上,通过对河北某钢铁厂的实际高炉生产数据进行分类比较,并结合填补办法的优缺点,针对高炉炼铁数据提出一套以简单统计类办法、线性插值法、机器学习法等多种办法相结合的方案,以实现高炉数据的深度整合及处理,满足数据挖掘工作的供数需求。同时选取了炉顶温度、氧气管道温度作为数据样本,利用临近点中间值法、临近点均值法、线性插值法、Adaboost算法等对样本数据进行了填补且填补效果较为理想,充分验证了方案的可行性。 相似文献
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This paper highlights technology development for space exploration. It draws on the proceedings of Space 88, Engineering, Construction, and Operations in Space, which includes 125 papers and 1,349 pages providing in‐depth discussions of space policy, extraterrestrial basing, space stations, orbiting structures, and areas of special interest. In the space station and orbiting structures (orbital facilities) section, papers discuss the engineering, construction, and operations of orbiting space systems. Papers in the extraterrestrial basing section deal with the engineering, construction, and operations challenges faced in development of bases and operations on extraterrestrial bodies. The special interest (interacting disciplines) section provides a discussion of challenges facing us in meeting needs for space power, life support, human factors, astronomy, education, and management. The purpose of this volume on engineering, construction, and operations of facilities and bases in space is to encourage and stimulate the development of the required technologies. The concluding section of this paper focuses on space policy and a view toward the future. 相似文献
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中国高炉炼铁技术装备发展成就与展望 总被引:1,自引:1,他引:0
近40年来,我国钢铁工业取得了巨大进步,钢铁产量连续多年居世界第一。我国高炉炼铁技术装备在大型化、现代化、高效化、长寿化等方面发展成就显著。2000年以来,一批5000m3以上特大型高炉、500m2以上大型烧结机、7.63m超大容积焦炉和年产400万t/a以上大型球团生产线相继建成投产,一系列自主研发、集成创新的炼铁关键技术在生产实践中取得重大应用成效。在技术装备大型化的同时,高炉富氧喷煤、无料钟炉顶、煤气干法除尘、顶燃式热风炉及高风温、高效低耗烧结技术、大型清洁炼焦技术等先进技术及其装备研发与应用成效显著,有力推动了炼铁技术装备进步。到本世纪中叶,我国钢铁工业格局和流程结构将发生重大变革,减量化、绿色化、智能化、高效化将是未来一个时期炼铁技术装备的主要发展趋势。 相似文献
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Robin Fell Chi Fai Wan John Cyganiewicz Mark Foster 《Canadian Metallurgical Quarterly》2003,129(4):307-314
A method is presented for the approximate estimation of the time for progression of internal erosion and piping, and development of a breach leading to failure in embankment dams and their foundations. The method accounts for the nature of the soils in the dam core, the foundation, and the materials in the downstream zone of the dam.?Guidance is also provided on the detectability of internal erosion and piping, taking account of the mechanism of initiation, continuation, and progression to form a breach, for internal erosion and piping in the embankment, the foundation and from the embankment to foundation.?It is shown that in many dams which have poor internal erosion and seepage control and are constructed mainly of earthfill, the time for potential development of piping is short, and for these dams continuous monitoring of seepage or surveillance would be needed to detect the piping in time to give warning of possible failure, and to give time to attempt intervention to prevent the failure. 相似文献
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冶金焦炭已经成为现代高炉炼铁技术所需的必备原料之一,被喻为钢铁工业的“基本食粮”,具有重要的战略价值和经济意义。随着低碳时代的来临和大喷煤技术的运用,焦炭的功能逐渐被替代。为了保证炉内的透气性以及透液性,作为高炉软熔带的“百叶窗”,焦炭作为料柱骨架和通道的作用更为突出,因此深入理解焦炭在白云鄂博矿高炉冶炼过程中的热态性能变化对指导白云鄂博矿的高效冶炼至关重要。以从包钢4号高炉中取出的入炉焦与风口焦为研究对象,使用X射线衍射仪、热重立式炉、扫描电镜、能谱仪等分析手段,对比研究了它们的基础特性、灰分的主要物相、反应性(CRI)与反应后强度(CSR)、微观孔隙结构及碱金属的含量及分布,从而得到焦炭在白云鄂博矿冶炼中的热态性能变化。结果表明,高炉中的焦炭在下降过程中发生气化反应,灰分含量提高,挥发分含量降低,SiO2含量显著降低,但是CaO、K2O、Na2O、MgO等碱性氧化物含量有所增加。二次加热前期焦炭发生氮气吸附,质量没有减少反而增加;后期焦炭发生碳气化反应,质量快速下降,风口焦的反应性提高,反应后强度降低。风口焦表面出现了类似蜂窝状的孔隙,且孔隙分布不均匀,特别是被渣铁侵蚀的焦炭基质,其气孔壁变得粗糙,孔隙出现合并。碱金属在风口焦中富集,碱性氧化物含量增加。风口焦石墨碳所对应的(002)衍射峰半峰宽急剧减小,扁平峰消失,峰形尖锐。晶体结构趋向有序,石墨化程度提高。 相似文献