不锈钢复合管生产工艺与设备

对采用拉拔复合法生产不锈钢复合管的工艺与设备进行了介绍.采用模角10°～15°,减径量小于8倍壁厚及自制润滑剂,可解决拉拔复合法生产中减径失稳与润滑问题.对生产不锈钢复合管的"拉拔复合法"与"包覆焊接法"的优缺点及技术经济指标进行了比较.     

不锈钢纤维生产工艺的现状分析

对生产不锈钢纤维的单丝拉拔法、集束拉拔法、切削法和熔抽法进行了介绍,并分析了每种方法的特点及我国不锈钢纤维生产和研究的现状,指出了不锈钢纤维生产的发展趋势.     

不锈钢纤维生产工艺的现状分析

对生产不锈钢纤维的单丝拉拔法、集束拉拔法、切削法和熔抽法进行了介绍,并分析了每种方法的特点及我国不锈钢纤维生产和研究的现状,指出了不锈钢纤维生产的发展趋势.     

倾斜煤层一次采全厚的新采煤方面

为了解决倾斜煤层一次采全厚的采煤方法,煤炭工业部煤炭科学研究院与淮南矿务局合作,于1959年在淮南新庄孜矿,倾角32°、厚度4米的煤层中研究试验成功了“<”型掩护支架采煤法.1960年以来,在淮南、徐州、鹤岗等矿区,用它来开采倾角30°～55°、厚度3～4.5米的煤层,实现了     

不锈钢内衬复合管在矿井下超长距离供液的应用研究

针对矿井下供液管超长距离供液存在压损大、易生锈、易老化、易腐蚀等问题,采用内衬不锈钢复合管,并对其易出现电化学腐蚀的端头部位进行改进优化.经过对比分析、现场试验证明,不锈钢内衬复合管符合矿井下超长距离供液的工作要求,其超远距离供液过程中压损控制在0.7～3.8 M P a范围,且抗腐蚀能力明显提高.     

矿柱回采工艺的改进

“西卡拉扎拉”矿于1972年开始地下开采,为了开采+170米水平以上三个阶段,国立采矿工业设计院设计采用了爆力运矿的阶段矿房法。矿床地质特征:矿体倾角为30°～42°,厚16～35米,矿石为磁铁矿-赤铁矿,含铁     

热载荷对冷拔20/316L复合管残余接触压力影响的数值模拟研究

运用有限元分析软件ABAQUS6.5对20/316L复合管拉拔成形过程进行模拟,在原有模型的基础上通过重启动分析建立复合管热应力有限元模型,探讨了内外管间残余接触压力的分布规律,研究了内衬316L复合管在热载荷作用下内外管间残余接触压力的变化,分析了热载荷对冷拔20/316L复合管残余接触压力的影响,找到内外管在温度载荷下发生脱离的最高工作温度,为复合管能够适用的温度范围提供理论依据。     

雷家寨铜多金属矿采矿方法选择探讨

雷家寨铜矿矿体为薄—厚矿体,倾角24°～30°,顶、底板围岩和矿体较稳固。根据矿岩产状及稳固性特征,提出采用房柱法和底盘漏斗空场法进行开采。研究表明,两种采矿方法采用后,降低了损失率、贫化率,提高了矿山生产的安全性,降低了劳动强度,提高了经济效益。     

兴隆庄矿综采面支架快速撤装的经验

<正> 综采设备的安装与撤除,是关系到综采工作面保持连续生产的一个重要环节,因此必须在技术上、组织上予以保证。我矿根据对12个综采工作面进行安装和对8个工作面进行撤除的长期探索,表明在煤层倾角2～8°,分层开采,顶板比较稳定的条件下,对4/560吨和4/550吨两种支撑掩护式支架撤除工作采用“前进式掩护撤架法”和“液压支架自吊自装法”,基本上获得了安全快速的效果,主要做法是: 一、停采前的准备综采工作面距停采线10m处开始铺设金     

无底柱分段崩落法回采中对缓倾斜矿段的处理

我矿主矿体井下开采用的是无底柱分段崩落法。矿体上部比较缓(倾角30°～70°),下部比较陡(倾角70°～90°)。在第一中段回采过程中,发现矿体上盘部位在倾向方向上急剧变缓,个别区段倾角变为20°以下。很显然,矿体变化以后,在缓倾斜区段的上部就会出现充填垫层空缺或不足的现象,给崩落法的正常回采带来了新的困难。针对这一情况,我矿采取了“先用空场法回采缓倾斜区段的矿石,后用水平     

China rare earth market review

正November 1~10,2014Chinese rare earth market was still inactive.Demand for rare earth products was weak.Consumers took a wait-and-see attitude for lower price.As it was an off season for rare earth products,it was expected that prices of rare earth could continue turbulence at the bottom in short terms.Due to a sharp drop,demand for rare earth from downstream recovered.Affected by new energy vehicles,wind powder and energy-efficient appliances,production of rare earth permanent     

China rare earth market review

正August 1~10,2014 There was some good news in rare earth industry recently.Restructuring plans of rare earth groups led by Baotou IronSteel Group and Xiamen Tungsten Group respectively have been approved by MIIT.And rare earth storage policy,which had been expected for a very long time,has been launched officially.Pushed by the good news,rare earth price started to rebound since August 5.Price of didymium oxide and dysprosium oxide rose about 1% to 2%,averagely.About 10% of     

China rare earth market review

正July 1~10,2014Due to weak demand from downstream industry and slow transactions,rare earth market remained weak and price of rare earth products continued to decline.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,     

New energy vehicle:an opportunity for rare earth magnets

<正>Extracted from Securities Guide 1.Popularity of new energy vehicles—an irresistible market trend1.1 Progress of new energy vehicles Chinese Premier Li Keqiang said recently on a visit to Xi'an BYD Autos that new energy vehicles,especially new energy bus,can lessen environment and noise pollution.He encouraged the use of new     

注浆加固技术在十三矿-685 m进风大巷中的应用

针对煤矿开采深度不断向深部延伸,掘进巷道受深部高应力的影响越来越大,巷道围岩整体稳定性差,矿山压力显现越剧烈现象,一般锚网喷加锚索支护无法从根本上控制巷道的变形。总结了平煤股份十三矿-685 m进风大巷注浆加固技术,依据对巷道掘进之后变形监测数据的采集,对巷道变形机理进行分析研究,并对注浆时段进行了合理选择,在对巷道的注浆工艺进行了充分论证的基础上,对巷道进行了注浆。注浆后效果表明:巷道滞后注浆时间段的选择非常重要,巷道在恰当的时间内进行注浆加固施工,能有效控制巷道的变形,巷道注浆后变形量明显减小,岩体的稳定性明显增强,减少了巷道日常维修工作,降低了矿井的生产成本,保障了矿井的安全生产。     

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.     

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.     

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     

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