矿山测量信息系统的功能设计与数据组织

分析了现行人工方式下矿山测量工作存在的问题,指出了建设矿山测量信息系统的必要性;并提出了矿山测量信息系统的功能设计及数据组织方案。     

矿山锅炉房设计方案探讨

寒冷地区的地下矿山通风如果不考虑加热措施,就会造成一定程度的井筒结冰,影响到提升安全。本文就矿山供热锅炉房供热方案的选择进行讨论,介绍了热风锅炉的结构特点,提出采用热风锅炉是一种寒冷地区地下矿山通热风的经济节能的方案。     

不稳固岩层中巷道的改造方案与施工组织

在不稳固岩层中（岩石的稳定性系数f≤4），巷道改造方案的选取是矿山井巷工程建设的难点。本文介绍了陇南洛坝铅锌矿在“边改造，边扩建，边生产”的矿山建设条件下，综合矿山实际情况，通过多方案比较后，确定的经济合理，施工快速简捷，巷道服务年限长的浆砌毛石墙，预制钢筋混凝土拱板支护改造方案和配套联合施工措施。实践证明，该方案能适应矿山生产，技术水平和今后发展的需要，总结了在不稳固岩层中巷道改造方案和施工组织经验，可供同类中小型矿山借鉴。     

基于积石山县无主砂石料矿山地质环境恢复治理的研究

积石山县大河家镇甘河滩无主砂石料矿由于早期被无序开采,形成了多处较大规模采坑和废石弃渣堆,对当地的生态环境影响较大.本文以该区域的无主砂石料矿为研究对象,分析了采矿活动对矿山地质环境的影响,提出了相应的环境恢复治理方案.该方案在实际的矿山恢复治理中已取得较明显的成效,说明采用的治理方案是合理的,能够在相似矿山地质环境问...     

某矿新建选矿厂厂址方案优化设计分析

矿山工程项目选矿厂厂址方案是项目决策的重要内容,某新建矿山通过对选取的多个选矿厂厂址方案进行详细的技术经济比较分析,选择最优的选矿厂厂址方案,以保证选矿厂厂址的安全性及经济性、且对矿山的总体运输和工艺设备布置最为有利。     

金属非金属地下矿山三大系统探索

主要对金属非金属地下矿山三大系统的设计与实现进行探索,以玉溪大红山矿业有限公司地下矿山相关系统的建设为背景,对各系统的结构、功能和实际应用效果进行了论述。提出了一种在金属非金属地下矿山三大系统的可行性方案。     

矿山项目开拓方案的技术经济比选方法

指出在矿山项目的高阶段设计中,开拓方案比选是非常重要的。其比选结果的正确与否,直接关系到项目投资的高低、效益的好坏,有时甚至决定了项目是否可行。笔者对矿山开拓方案比选的各种方法进行了总结,分析了各种方法的应用前提和条件,以及其对比选结果的准确程度。     

关于岩石分级问题

根据冶金部科技司的要求,我们开展了岩石分级的研究工作。三年来在矿山领导、工人和技术人员的大力支持下,以全国矿山为主,先后调查了15个省市44个单位,实测了28个矿山和工地的岩石可钻性指标,并收集了267个岩石标本,进行了有关力学指标试验,初步掌握了矿山穿凿工程的岩石可钻性分级情况,验证了所推荐的岩石可钻性分级的方案。     

矿山生态环境治理恢复研究 ——以金华市某废弃石料矿为例

加强矿山生态环境治理恢复已成为当前环保工作的重要任务.本文以金华市某废弃石料矿为例,针对受损山体的实际情况,对该矿山在生态环境治理恢复中的实践过程进行了研究,着重分析了地质灾害治理和植被恢复方案及工艺,旨在为开展本地区同类矿山生态环境治理恢复提供一定的参考.     

混合法延深井筒在深部铜矿的应用

本文主要介绍了该矿二期基建工程的西风井原位延深工程施工与正常生产关系的正确处理方法，在施工方案的选择上，正确分析了影响方案制定的不利因素，充分的利用生产矿山已形成的对施工进行的有利条件，采用了符合矿山生产实际的施工方法与严格的施工顺序，保证了工程的顺利实施。     

Effects of Post-weld Heat Treatment on Microstructure,Mechanical Properties and the Role of Weld Reinforcement in 2219 Aluminum Alloy TIG-Welded Joints

In as-welded state, each region of 2219 aluminum alloy TIG-welded joint shows diff erent microstructure and microhardness due to the diff erent welding heat cycles and the resulting evolution of second phases. After the post-weld heat treatment, both the amount and the size of the eutectic structure or θ phases decreased. Correspondingly, both the Cu content in α-Al matrix and the microhardness increased to a similar level in each region of the joint, and the tensile strength of the entire joint was greatly improved. Post-weld heat treatment played the role of solid solution strengthening and aging strengthening. After the post-weld heat treatment, the weld performance became similar to other regions, but weld reinforcements lost their reinforcing eff ect on the weld and their existence was more of an adverse eff ect. The joint without weld reinforcements after the post-weld heat treatment had the optimal tensile properties, and the specimens randomly crack in the weld zone.     

The First Phase of the SRIF Industrialized Base in ＂West Area＂ Has Been Put into Operation

After nearly two years＇ tense construction, the first phase of industrialized base of Shenyang Research Institute of Foundry （SRIF）, located at the Tiexi Casting and Forging Industrial Park in the west of Tiexi District, has now been completed and formally put into operation.     

Thermodynamics Study on the Decomposition of Chromite with KOH

Institute of Process Engineering, Chinese Academy of Sciences, China, has proposed a method for oxidative leaching of chromite with potassium hydroxide. Understanding the mechanism of chromite decomposition, especially in the potassium hydroxide fusion, is important for the optimization of the operating parameters of the oxidative leaching process. A traditional thermodynamic method is proposed and the thermal decomposition and the reaction decomposition during the oxidative leaching of chromite with KOH and oxygen is discussed, which suggests that chromite is mainly destroyed by reactions with KOH and oxygen. Meanwhile, equilibrium of the main reactions of the above process was calculated at different temperatures and oxygen partial pressures. The stable zones of productions, namely, K2CrO4 and Fe2O3, increase with the decrease of temperature, which indicates that higher temperature is not beneficial to thermodynamic reactions. In addition, a comparison of the general alkali methods is carried out, and it is concluded that the KOH leaching process is thermodynamically superior to the conventional chromate production process.     

Influence of Heat Treatment on Damping Behaviour of the Magnesium Wrought Alloy AZ61

The effect of isochronal heat treatments for 1h on variation of damping, hardness and microstructural change of the magnesium wrought alloy AZ61 was investigated. Damping and hardness behaviour could be attributed to the evolution of precipitation process. The influence of precipitation on damping behaviour was explained in the framework of the dislocation string model of Granato and Lücke.     

Effect of Rare Earth Doping on Impedance,Modulus and Conductivity Properties of Multiferroic Composites:0.5(BiLa_xFe_(1-x)O_3)–0.5(PbTiO_3)

The Lanthanum-doped bismuth ferrite–lead titanate compositions of 0.5(Bi LaxFe1-xO3)–0.5(Pb Ti O3)(x = 0.05,0.10,0.15,0.20)(BLxF1-x-PT) were prepared by mixed oxide method.Structural characterization was performed by X-ray diffraction and shows a tetragonal structure at room temperature.The lattice parameter c/a ratio decreases with increasing of La(x = 0.05–0.20) concentration of the composites.The effect of charge carrier/ion hopping mechanism,conductivity,relaxation process and impedance parameters was studied using an impedance analyzer in a wide frequency range(102–106Hz) at different temperatures.The nature of Nyquist plot confirms the presence of bulk effects only,and non-Debye type of relaxation processes occurs in the composites.The electrical modulus exhibits an important role of the hopping mechanism in the electrical transport process of the materials.The ac conductivity and dc conductivity of the materials were studied,and the activation energy found to be 0.81,0.77,0.76 and 0.74 e V for all compositions of x = 0.05–0.20 at different temperatures(200–300 °C).     

Quantitative Analysis of the Crystallographic Orientation Relationship Between the Martensite and Austenite in Quenching–Partitioning–Tempering Steels

The orientation relationships(ORs)between the martensite and the retained austenite in low-and medium-carbon steels after quenching–partitioning–tempering process were studied in this work.The ORs in the studied steels are identified by selected-area electron diffraction(SAED)as either K–S or N–W ORs.Meanwhile,the ORs were also studied based on numerical fitting of electron backscatter diffraction data method suggested by Miyamoto.The simulated K–S and N–W ORs in the low-index directions generally do not well coincide with the experimental pole figure,which may be attributed to both the orientation spread from the ideal variant orientations and high symmetry of the low-index directions.However,the simulated results coincide well with experimental pole figures in the high-index directions{123}_(bcc).A modified method with simplicity based on Miyamoto’s work was proposed.The results indicate that the ORs determined by modified method are similar to those determined by Miyamoto’method,that is,the OR is near K–S OR for the low-carbon Q–P–T steel,and with the increase of carbon content,the OR is closer to N–W OR in medium-carbon Q–P–T steel.     

Growth Kinetics of Single Inclusion Particle in Molten Melts

On the basis of the single-particle framework, a new theory on inclusion growth in metallurgical melts is developed to study the kinetics of inclusion growth on account of reaction and collision. The studies show that the early growth of inclusion depends on reaction growth and Brawnian motion collision, and where the former is decisive, the late growth depends on turbulence collision and Stokes＇ collision, and where the former is dominant; collision growth is very quick during the smelting process, lessened in the refining process, but nearly negligible in the continuous casting process.     

Theoretical Analysis for the Motion and Temperature of Melt Droplets in Spray Degassing Process

The motion of melt droplets in spray degassing process was analyzed theoretically. The height of the treatment tank in spray degassing process could be determined by the results of theoretical calculation of motion of melt droplets. To know whether the melt droplets would solidify during spraying process, the balance temperature of melt droplets was also theoretically analyzed. Then proof experiments for theoretical results about temperature of melt droplets were carried. In comparison, the experimental results were nearly similar to the calculation results.     

Using Finite Element and Contour Method to Evaluate Residual Stress in Thick Ti-6Al-4V Alloy Welded by Electron Beam Welding

This work was to reveal the residual stress profile in electron beam welded Ti-6Al-4V alloy plates(50 mm thick) by using finite element and contour measurement methods.A three-dimensional finite element model of 50-mmthick titanium component was proposed,in which a column–cone combined heat source model was used to simulate the temperature field and a thermo-elastic–plastic model to analyze residual stress in a weld joint based on ABAQUS software.Considering the uncertainty of welding simulation,the computation was calibrated by experimental data of contour measurement method.Both test and simulated results show that residual stresses on the surface and inside the weld zone are significantly different and present a narrow and large gradient feature in the weld joint.The peak tensile stress exceeds the yield strength of base materials inside weld,which are distinctly different from residual stress of the thin Ti-6Al-4V alloy plates presented in references before.     

Microstructures and Tensile Properties of Ultrafine-Grained Ni–(1–3.5) wt% SiC_(NP) Composites Prepared by a Powder Metallurgy Route

Silicon carbide nanoparticle-reinforced nickel-based composites(Ni–Si CNP),with a Si CNPcontent ranged from1 to 3.5 wt%,were prepared using mechanical alloying and spark plasma sintering.In addition,unreinforced pure nickel samples were also prepared for comparative purposes.To characterize the microstructural properties of both the unreinforced pure nickel and the Ni–Si CNPcomposites transmission electron microscopy(TEM) was used,while their mechanical behavior was investigated using the Vickers pyramid method for hardness measurements and a universal tensile testing machine for tensile tests.TEM results showed an array of dislocation lines decorated in the sintered pure nickel sample,whereas,for the Ni–Si CNPcomposites,the presence of nano-dispersed Si CNPand twinning crystals was observed.These homogeneously distributed Si CNPwere found located either within the matrix,between twins or on grain boundaries.For the Ni–Si CNPcomposites,coerced coarsening of the Si CNPassembly occurred with increasing Si CNPcontent.Furthermore,the grain sizes of the Ni–Si CNPcomposites were much finer than that of the unreinforced pure nickel,which was considered to be due to the composite ball milling process.In all cases,the Ni–Si CNPcomposites showed higher strengths and hardness values than the unreinforced pure nickel,likely due to a combination of dispersion strengthening(Orowan effects) and particle strengthening(Hall–Petch effects).For the Ni–Si CNPcomposites,the strength increased initially and then decreased as a function of Si CNPcontent,whereas their elongation percentages decreased linearly.Compared to all materials tested,the Ni–Si CNPcomposite containing 1.5% Si C was found more superior considering both their strength and plastic properties.