共搜索到3590条信息，每页显示10条信息，共359页。用时：0小时0分0秒624毫秒
加拿大多阳金矿尹健生,吴子振摘 要:<正> 由于黄金价格一直在11.2~111.6美元/克之间被动,环境管理法越来越严格,职业保健和安全费用不断上升,加拿大许多金矿目前正为继续生存担忧.对投资作恰当的统计比以前任何时候都更加重要.6月份,两座加拿大金矿停产,即西北地区两北黄金公关键词:......
on segregation of filling slurry WEN Zhenjiang1, GAO Qian1, CHEN Dexin2, WANG Yongding2 (1. Key Laboratory of High Efficient Mining and Safety of Metal Mine Ministry of Education, School of Civil... in the mixed aggregate filling slurry of Jinchuan mine waste rock and sanding, the segregation of slurry was controlled by optimizing the particle size distribution of mixed aggregate. Firstly......
by rheo-squeeze casting with semi-solid Al-Si alloy slurry prepared by ultrasonic vibration process, and the microstructure of this alloy was investigated. Besides the microstructures of primary Si...-equilibrium α(Al) phases to form above eutectic temperature and grow into non-dendritic spheroids in the process of semi-solid slurry preparation. Non-equilibrium α(Al) phases formed in the hypereutectic Al......
化分析；料浆配比；BP神经网络；优化选择 中图分类号:TD853 文献标志码:A 文章编号:1672-7207(2013)07-2867-08 Optimization of filling slurry... classified sailings as filling aggregate was established by analyzing physical and chemical properties of tailings. Influencing factors of slurry quality were preliminarily identified by ratio test......
间接超声振动制备5052铝合金半固态浆料吕书林1,吴树森2,戴维2,安萍2,毛有武2(1.湖北省武汉市华中科技大学材料成形与模具技术国家重点实验室2.华中科技大学材 料成形与模具技术国家重点实验室)摘 要:采用一种新型的间接超声振动装置制备5052铝合金半同态浆料,研究了启振温度和振动时间对浆料组织的影响.结果表明,在液相线温度643℃及以上开始对5052铝合金熔体进行50 s的间接超声处理,能获得晶粒细小圆整的半固态浆料.在液相线温度开始通过杯底对合金熔体进行间接超声处理,可在杯底附近大量形核,随后初生晶粒以......
at the common later strength failure phenomenon in cemented sulfur tailings backfill, sulfur and non sulfur tailings backfill strength tests were carried out, and the effect of cement sand ratio and slurry.... The influence of the filling slurry concentration on the strength of the filling body is also significant. When the concentration is 74%-76%, the decrease of backfill strength is the smallest......
)09-3131-09 Limit support pressure for excavation face of shallow slurry shield-driven tunnel in water permeable strata CAO Chengyong1, SHI Chenghua1, 2, LEI Mingfeng1, 3, PENG Limin1, 2 (1... Engineering Division Co. Ltd, Changsha 410004, China) Abstract: Aiming at shallow slurry shield-driven tunnel in water permeable strata, the theoretical analysis model was established on the limit support......
滴数量也相应增多,导致脱硫净烟气中次生细颗粒物数量浓度增大[24]. 图14 脱硫浆液质量分数对换热器进出口细颗粒物数量浓度的影响 Fig. 14 Effect of slurry mass fraction on number concentrations of fine particles at the inlet and outlet of heat exchanger 图15所示为换热器...细颗粒物受惯性力作用依旧明显,故总脱除效率受浆液质量分数的影响不大.增大脱硫浆液的质量分数虽然能提高换热器对细颗粒物的脱除效率,但考虑到脱硫净烟气中次生细颗粒物数量浓度随浆液质量分数的增加而显著上升,一般选取脱硫浆液质量分数为10%~15%. 图15 脱硫浆液质量分数对细颗粒物脱除效率的影响 Fig. 15 Effect of slurry mass fraction on removal......
Trans. Nonferrous Met. Soc. China 29(2019) 1200-1210 Anodizing parameters for superheated slurry cast 7075 aluminum alloys Itsaree IEWKITTHAYAKORN1, Somjai JANUDOM1,2, Narissara MAHATHANINWONG2,3... choice were assessed to find an appropriate combination for the superheated slurry cast 7075 Al alloy substrate. The alloy was anodized in sulfuric acid electrolyte or alternatively in sulfuric acid......
; 文献标志码:A 文章编号:1672-7207(2012)01-0124-06 Numerical simulation about erosion characteristics of solid particle in slurry pump WU Bo1, YAN... and the SIMPLE (Semi-implicit method for pressure-linked equations) algorithm, the numerical simulation about solid-liquid two-phase turbulence in the full passage field of centrifugal slurry pump was carried......
