敏化剂类型对乳化炸药减敏程度的影响

利用水下爆炸测试系统,对不同动压作用后玻璃微球和膨胀珍珠岩敏化的乳化炸药的减敏现象进行了研究,比较了在相同动压作用前后两种敏化方式的乳化炸药的减敏程度。结果表明,敏化剂的类型对乳化炸药动压下的减敏作用影响很大,在相同动压作用后的膨胀珍珠岩敏化的乳化炸药的减敏程度,大于玻璃微球敏化的乳化炸药。     

几种乳化炸药敏化方式的比较

研究比较了乳化炸药的各种敏化方式。认为：以膨胀珍珠岩、玻璃微球和化学发泡为代表的三种单一敏化方式各有优缺点：而采取复合敏化的方式,可以获得近似理想的敏化效果。     

新型快速化学发泡敏化乳化炸药的研究

通过与膨胀珍珠岩及亚硝酸钠敏化的乳化炸药相比较 ,快速化学发泡敏化的乳化炸药具有生产稳定、成本低、爆炸性能好、威力大等优点 ,使乳化炸药在敏化技术和生产上又有新的突破     

化学敏化的MgH_2型储氢乳化炸药抗动压和爆轰性能的研究

针对传统乳化炸药在使用过程中存在的压力减敏和爆炸威力低的问题,研制出化学敏化的MgH_2型储氢乳化炸药,并利用包覆MgH_2的方法有效控制了炸药的发泡过程。冲击波动压减敏实验和水下爆炸实验结果表明,与玻璃微球型乳化炸药相比,MgH_2型储氢乳化炸药的冲击波峰值压力、比冲击波能和比气泡能分别增加了20.5%、21.2%和34.7%,同时具有优异的抗动压减敏性能和储存稳定性。     

一种新型乳化炸药物理敏化材料的研究

利用珍珠岩、玻璃微珠和A1微粒3种材料进行全物理敏化制备乳化炸药,对敏化效果和乳化炸药性能进行测试和比较。结果表明：使用A1微粒敏化的乳化炸药各项性能指标均优于珍珠岩敏化,略好于玻璃微珠,且A1微粒具有环保、无污染等优点,值得进一步研究。     

一种新型乳化炸药物理敏化材料的研究

利用珍珠岩、玻璃微珠和A₁微粒3种材料进行全物理敏化制备乳化炸药 ,对敏化效果和乳化炸药性能进行测试和比较。结果表明：使用A₁微粒敏化的乳化炸药各项性能指标均优于珍珠岩敏化,略好于玻璃微珠,且A₁微粒具有环保、无污染等优点,值得进一步研究。     

含水炸药敏化剂膨胀珍珠岩敏化机理探讨

膨胀珍珠岩是乳化炸药等含水炸药较有效的敏化剂,实践证明了其所含微气泡敏化的正确性。根据BET法和BJH法测定了膨胀珍珠岩的比表面积、孔径分布和孔容等微观结构参数。结果说明,膨胀珍珠岩具有较大的比表面积和总表面积、适中的孔径和孔径分布以及较大的累积孔体积和累积孔面积,为膨胀珍珠岩具有敏化作用和密度调节作用找到了最直接的证据。本研究从膨胀珍珠岩微细孔的微观结构上,解释和说明了其具有良好敏化作用的根本原因在于其特定的多微孔表面结构,符合热点起爆的有关机理。     

新型敏化气泡载体对乳化炸药爆炸威力及减敏性的影响

针对NaNO2敏化的传统乳化炸药存在的爆炸威力低和压力减敏问题,研制出了MgH2型储氢乳化炸药。该炸药使用储氢材料MgH2敏化,MgH2在乳化炸药中起到了敏化剂和含能材料的双重作用。在炸药爆炸过程中MgH2参与爆轰反应,提高了乳化炸药的爆炸威力;当炸药受到外界压力作用时,MgH2受压会释放出H2,从而减弱敏化作用的破坏。水下爆炸和冲击波动压作用实验结果表明:与传统NaNO2型乳化炸药相比,MgH2型储氢乳化炸药具有优异的爆轰性能和抗压力减敏能力。最后,通过扫描电镜研究2种乳化炸药受压前后微观结构的变化,探讨MgH2型储氢乳化炸药抗压力减敏机理。     

NL有机微球对乳化炸药的敏化研究

分析了国内外乳化炸药敏化剂的性能特点和存在的问题,介绍了NL有机微球作为乳化炸药新型敏化剂的技术特点。研究了NL有机微球的含量、敏化温度、混合方式对乳化炸药的密度调节能力和爆炸性能的影响规律,结果表明,当NL添加量为乳胶基质质量的0.35%时,并以1∶2比例同水混合形成浆液,于90～95℃敏化乳胶基质,具有优良的敏化效果,乳化炸药装药密度为1.16 g/cm3,爆速为5 350 m/s,殉爆距离为6 cm,贮存期可达1年。     

玻璃微球对乳化炸药冲击波感度的影响

设计了新的试验方法对玻璃微球敏化的乳化炸药的冲击波感度进行了测试,并建立了乳化炸药冲击波感度评估计算模型。分析了玻璃微球的含量、乳化炸药的密度等因素对其冲击波感度的影响。在一定的密度范围内,随着玻璃微球含量的增加,乳化炸药的密度逐渐减小,炸药的监界起爆压增大,亦即炸药变得钝感。研究对乳化炸药的生产和应用具有一定的指导意义。     

Current situation and future trend of China rare earth luminescent material industry

<正>Rare earth luminescent material is one of the most important application sectors of rare earths.China enjoys the exceptional advantage to develop rare earth luminescent material for its abundant rare earth resources.After several decades'endeavor,China's rare earth luminescent material industry,headed by rare earth phosphor for lamp and LED and high efficient rare earth energy-saving light source,has been gradually developed into a scale industry.China has become a major production base of rare earth phosphor for lamps and rare earth     

China rare earth market review

正June 1~10,2014Rare earth market remained weak.Quoted price of rare earth products was similar to that in May.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,polishing powder and ceramic industries remained inactive.Demand from downstream industry was soft.Consumers purchased on their needs.Suppliers had strong intention to sell.Prices of rare earth products     

Annual Report analysis of Chinese rare earth-related listed companies in 2013

<正>Chinese rare earth-related listed companies have published their 2013 annual reports.It can be understood from their reports that production and operation activities of Chinese rare earth-related companies were still heavily affected by macro economy and industrial policies.They basically followed the steps of national economy.In 2013,world economy recovered slowly but the economy     

Market opportunities and challenges for rare earth polishing powder

正1.Status of rare earth polishing powder Rare earth polishing powder with high content of cerium oxide began to replace iron oxide for glass polishing and became one of the key materials in glass polishing process since 1940.Compared with traditional iron oxide,rare earth polishing powder has many advantages,such as fast polishing rate,high polishing quality and long service life.It can achieve good surface quality and improve operation conditions.For example,in lens polishing,the polishing work that cerium     

Baotou Research Institute of Rare Earths developed a new RE alloy preparation technology

正Pyrometallurgy Laboratory of Baotou Research Institute of Rare Earths had independently developed a new preparation technology of rare earth alloy for NdFeB.The alloy can remarkably enhance the coercivity of NdFeB magnet but also evidently reduce the production cost of the magnet.The new master alloy was prepared in the kA pilot-scale electrolytic cell by the independent technology.The rare earth master alloy can be used as the raw material for NdFeB.Compared     

矿用防爆轴流对旋主要通风机叶片ANSYS模态分析及应用

高效节能矿用防爆对旋主要通风机的叶片是主要通风机运行的关键部件,叶片在运行时不断受到气流的作用力,从而使叶片产生振动,当叶片振动的频率与叶片的固有频率接近时,容易产生共振从而导致叶片的断裂。一旦叶片断裂时,对主要通风机的安全运行产生致命的影响,从而导致矿山、化工等企业发生重大事故,将会产生不可估量的损失。基于有限元分析软件ANSYS,对高效节能矿用防爆轴流对旋主要通风机叶片进行模态分析及产生对应的六阶模态频率,对主要通风机叶片的运行频率、固有频率及产生的共振问题进行了原理分析,并且解决了叶片频率共振的问题,从而为主要通风机叶片结构设计提供理论依据,并对主要通风机叶片的安全运行提供保障。     

2013 NdFeB export analysis

<正>China totally exported nearly 24,000 tonsof NdFeB products during 201 3,including 18,825 tons of permanent magnet,valued USD 1.34 billion at an average price of 71.4 USD/kg;3,277 tons of NdFeB magnetic powder,valued USD 1 01 million at an average price of 30.9 USD/kg;1,334 tons of strip casting ribbon,with total export value of USD 74million at an average price of 55.3 USD/kg;and 586     

Market and recycling of NiMH battery

<正>Market status and future trend of NiMH battery1.Global market of small NiMH battery Global market size of small NiMH batteries declined year on year since 2011.The trend will continue to 2018,at the rate of 5%to 10%annually.Demand for small NiMH batteries will be stable gradually.Many electrical apparatuses are powered by the built-in lithium battery today,which is the main reason for the shrunk market of small NiMH batteries.But,for some products,small NiMH     

China rare earth market review

正September 1-10,2014 Affected by the National Day holiday,rare earth transaction was stagnant and the market showed a weak steady state.As there was no good news for downstream market,some products with flat demand would likely rally slightly for some time to     

唐口煤矿深部复杂开采工作面瓦斯分源涌出规律研究

研究工作面瓦斯涌出规律对工作面瓦斯治理有重要意义。为了得到唐口煤矿深部3号煤层复杂开采条件下工作面回采时期瓦斯涌出时空演化规律,选取6304工作面作为对象,采用实测方法研究6304工作面瓦斯涌出规律。结果表明:6304工作面瓦斯涌出量为6.534 m³/min,其中煤壁占34.27%,落煤占29.62%,采空区占36.11%;沿工作面倾向由低到高,瓦斯浓度整体为上升趋势,其中1—76号架工作面瓦斯浓度小于0.20%,76—102号架瓦斯浓度上升明显,最大为0.387%;上隅角的后部采空区是工作面的瓦斯主要涌出源,上隅角1号测点瓦斯浓度0.78%,上隅角周边3号、5号、7号、8号、9号测点瓦斯浓度平均为0.643%;周期来压时,上隅角瓦斯相对平时较高。研究为针对性的瓦斯分源监控与灾害防治提供基础。