综掘工作面除尘工艺实践

山脚树矿21129半煤岩巷掘进过程中,产生的粉尘较大,水雾降尘不能有效降低回风流中煤尘浓度,故采用泡沫降尘技术进行除尘试验。现场试验表明:使用泡沫抑尘技术除尘,全尘除尘效率是水雾降尘效率的2.32倍,呼吸性粉尘降尘效率是水雾降尘效率的3.01倍。泡沫除尘效率高,消除了煤尘带来的安全隐患,提高了工作效率。     

综掘工作面高效泡沫降尘机理及应用研究

针对综掘工作面粉尘浓度高、污染严重的现状,采取了高效泡沫降尘技术,详细分析了泡沫降尘机理,研究了采用泡沫提高降尘效率的原因,并根据综掘工作面生产条件和生产工艺设计了泡沫除尘系统各部件的工作参数和固定方式,对不同湿润剂添加比例条件下的工作面粉尘浓度进行测试,结果表明,其总粉尘降尘效率为91.4%~94.2%,显著降低了工作面的粉尘浓度。     

泡沫除尘技术在综掘面的应用

针对掘进工作面粉尘灾害严重的现状,在系统分析泡沫除尘技术特点的基础上,提出了一种综掘工作面泡沫除尘应用工艺,并应用于平顶山一矿戊10-21180掘进工作面。现场应用结果表明：在掘进机司机处,泡沫对全尘的降尘效率达到87.90％,为水雾降尘的2.10倍;对呼吸性粉尘的降尘效率达到75.97％,为水雾的2.37倍,防尘效果显著,有效治理了掘进面粉尘灾害。     

薄煤层半煤岩综掘工作面泡沫除尘技术应用

对泡沫除尘技术的除尘原理、应用条件、技术参数、应用工艺等进行了介绍;通过在滨湖煤矿薄煤层综掘工作面试用泡沫除尘技术前后分析对比,泡沫除尘技术与其它湿式抑尘相比,用水量可减少30~80%,降尘效率达到了84.43%,对呼吸性粉尘的降尘效率是68.85%。泡沫除尘技术的应用有效地降低了井下掘进工作面的粉尘浓度,取得了显著的防尘效果。     

泡沫除尘喷雾技术及其应用实践

为了降低掘进工作面的粉尘浓度,分析了泡沫除尘的原理与综掘机割煤产生粉尘机理,对泡沫除尘成功进行了应用实践。泡沫除尘装置安装在综掘机截割部,并对比测定了割煤期间未开启喷雾、利用喷雾除尘及开启泡沫除尘装置的除尘效果。现场应用表明:泡沫除尘对于全尘的除尘率达90%以上,是普通喷雾降尘的2.03倍,尤其是对呼吸性粉尘降尘效果更为明显,是普通喷雾的2.45倍,具有极高的推广价值。     

松软突出煤层炮掘工作面粉尘污染分析与防治

针对松软突出煤层炮掘工作面供风量大、风筒出口风速高、煤质松软破碎、生产过程中粉尘污染严重的问题,分析了梁北矿松软突出煤层的物理特性及煤巷炮掘工作面的粉尘产生和分布特点,并针对性地采取放炮高压喷雾、打眼作业孔口除尘、个体防护等防尘措施。高压喷雾降尘系统的降尘效率为82.9%,打眼作业孔口除尘装置的降尘效率为96%,使得煤巷炮掘工作面的粉尘浓度得到了有效的控制,工作面的作业环境得以大大改善,保障了职工的身体健康和矿井的生产安全。     

大断面全岩巷综掘工作面泡沫降尘技术

为了解决大断面全岩巷综掘工作面高浓度粉尘问题,结合大断面岩巷综掘工作面产尘特点,在对大断面岩巷综掘工作面综掘机截割破岩的过程分析后,利用Fluent软件,对大断面岩巷综掘工作面粉尘运动场进行数值模拟,并分析了粉尘运动规律及粉尘浓度分布情况,依据泡沫降尘原理,设计了大断面岩巷综掘工作面泡沫降尘工艺系统,并在淮北朱仙庄煤矿北翼胶带运输大巷大断面岩巷综掘工作面进行了现场应用。结果表明,综掘岩尘主要集中在综掘工作面回风侧,在尘源下风向的某一回风侧浓度达到最大;泡沫降尘工艺系统制备的泡沫能包裹综掘机截割头,覆盖岩壁达到提前润湿岩体,减少和抑制粉尘的产生,同时又能阻断已产生粉尘的扩散通道,对全尘和呼吸性粉尘的平均降尘效率分别为86.2%和84.4%,是水喷雾降尘效率的3.6倍和4.6倍,取得了理想的降尘效果。     

综掘工作面高效泡沫降尘装置研制及应用

针对综掘工作面粉尘浓度高、治理困难的现状,提出采用高效泡沫除尘技术。通过对发泡器、添加装置、喷枪等部件进行研究,研制了泡沫降尘装置。通过新桥煤矿2501综掘工作面应用证明,泡沫降尘装置运行稳定,在湿润剂添加比例为2.5%条件下总粉尘降尘效率为94.2%,显著改善了工作面作业环境。     

抑尘雾炮系统的研制及其在掘进工作面的应用

综掘工作面粉尘浓度大,严重威胁着井下工作人员的职业安全健康和煤矿的安全生产。研制出了一种高效的抑尘雾炮系统,该系统包括聚焦型控源抑尘雾炮、发散型隔断抑尘雾炮和水射流吸液装置。该装置在漳村煤矿480材料巷综掘面进行现场试验,对比分析了未采用任何防尘措施,采用外喷雾降尘措施和采用雾炮除尘系统3种工况条件下粉尘浓度。结果表明,综掘面的粉尘浓度大大降低,整个工作面全尘和呼尘的浓度降低了93．9%和94．4%,较原先喷雾降尘技术降尘效果提高30%以上,解决了综掘面粉尘浓度过高的难题。     

掘锚面除尘技术优化及应用研究

针对矿井采用掘锚机+梭车+联运机掘进期间工作面粉尘浓度高的现状,根据寸草塔煤矿掘锚面产尘现状,优化掘锚面除尘系统,利用ANSYS软件建立巷道粉尘扩散几何模型,研究粉尘浓度的扩散规律,验证除尘体系的应用效果。回风流采用感应气水喷雾与高压喷雾相结合的防尘布局。结果表明：掘锚面司机处全尘浓度由283.6 mg/m3降低至10.5 mg/m3,降尘率达到了96.3%,改造综合防尘系统后取得了较好的除尘效果。     

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     

China rare earth market review

正November 21~30,2014Due to weak demand from downstream industries,transactions of rare earth in Chinese domestic market were inactive.It was difficult to sell any rare earth products except for dysprosium oxide and terbium oxide.Suppliers lost confidence in recent market.Demand for rare earth products was soft.Consumers continued to take a wait-and-see attitude.Rare earth export market remained slow.     

Galaxy Magnets achieved the net profit of 34.02 million yuan in the first six months of 2014

正Galaxy Magnet announced its financial results for the first half of 2014 on August 14.For the first six months ended on 30 June 2014,Galaxy Magnet achieved operation income of RMB 182.3 million,up8.40% over the same period of 2013,and the net profit attributable to the shareholders of the listed company of 34.02 million yuan,increasing 35.49% over the same period of last year.Stable performance increase was led by development of new customers and application market of magnets.     

Rare Earth Application in Steel in China

<正>China has rich rare earth resources.Output of rare earth and steel in China ranks the top first in the world.However,there is still certain distance between the steel produced in China and developed countries from the point of varieties and quality.China still has to import some types of steel.Improving the quality should be emphasiZed in future development of steel industry in China.Rare earth can be used to upgrade traditional steel     

Current situation and future trend of China rare earth luminescent materialindustry(continued)

<正>Developing ecological lighting source The world is facing the big problem of energy shortage today and the contradiction between economy development and environmental protection is worsened.Therefore,people are more likely to choose an ecological light source that is more energy efficient and environmental friendly.The choice provides great opportunity for the development of rare earth optical material industry in China.The concept of green lighting positions rare earth luminescent material as a leading player in illumination market.The light source of both rare earth luminescent lamp and LED lamp is ecological and energy saving.This is why     

稀散金属产业的观察与思考

分析了近年来国内外稀散金属产业的生产、应用、资源与市场状况.铟锡氧化物靶材、砷化镓晶片、锗红外材料、铼高温合金和硒在电解锰及玻璃的应用等已成为稀散金属的主要应用领域.稀散金属的产量快速增长达到历史高位而导致了市场的失衡.以GaInP_2/GaAs/Ge,CIGS和CdTe为代表的非硅系太阳能电池是稀散金属的新兴应用领域,将给稀散金属带来日益增长的需求.