Abstract: The feasibility of bio-leaching valuable metals from mutimetallic nodules in the deep sea bed by using thiobacillus ferrooxidans(T.f.) bacteria was tested. The conditions of bio-leaching valuable metals Co and Ni from multimetallic nodules,for example:the mass ratio of culture medium and nodules, leaching pH Value, inoculation value and leaching temperature have been studied. In the process, the T.f. was tamed. These tests proved it was feasible that:using leathen culture, adding pyrite as the nourishment substance and reductant, under general temperature, acid condition, the nodules were not dried and ground, while the bio-leaching would be carried out effectively, leaching time was nine days, leaching rate was as follows:copper 45.21%, cobalt 98.22%, nickel 95.12%, manganese 97.54%, iron 12.89% (in the leaching solution).
Abstract: The recovers of anthracite sludge in Fenghuangshan Mine by flotation column broke through the tradition that notation does not fit to anthraciye. The application of flotation colunm as a new technology in the recovery of waste anthracite did not only bring benefits to the Min by full utilization of the sludge, but also reduced the environmental pollution of the sludge discharge.
Abstract: By means of the laboratory manufacture technology established by UST Beijing, emulsion explosives(EE) test samples sensitized by glass micro-balloons(GMB) were manufacture. Influence of GMB content and density of EE on the detonation velocity are studied. The detonation velocity characteristics of the industrial explosives are analysed. With the increase of the density of EE, the detoration velocity first increases to the top point, then decreases, untill the emulsion explosiues have been dead pressed.
Abstract: On the basis of its specialty, according as principle of priority to prevent of Rescue DSS, the fire characteristic of lab simulation technology, computer simulation technology, far-off control fire proofing door auto-control technology are applied to study mine's fire. The sedation calculation and practice of mine fire rescue's decision-making, are processed.
Abstract: Discounted cash flow (DCF) techniques are widely used for valuing project investment. But this convention DCF has a pitfall that underestimates the value of the mine. Using mining management flexibility and following options pricing processes, new approach and quantitative tools to the value of a mine and the project evaluation are developed.
Abstract: The influences of chemical compositions and cooling rate on the crystallization temperature of mold fluxes were studied with WCT-2 DTA. Under the experiment conditions, the crystallization temperature increases with the increase of basicity and then decreases; the crystallization temperature increases with F contend and decreases with the enrichment of Na2O, Al2O3, MgO. Increasing cooling rate, the crystallization temperature is reduced slightly.
Abstract: According to the coexistence theory of slag structure as well as the measured surface tension of CaO-Al2O3-SiO2 at different temperatures and slag compositions, a calculating model of surface tension for the slag melts has been formulated. Calculated results agree with measured values,showing that the relationship between the surface tension and the mass action concentrations as well as temperatures of slag melts is correct.
Abstract: The distribution thickness of steel shell was gotten by added the sulfur into the mould of continuous casting slab. Use the steel shell thickness, the shape of meniscus, soildification coefficient of mould, solidification velocity and the gradient of temperature in shell were calculated.
Abstract: Non-metallic inclusions in the steel for pressure vessels produced through BOF-RH-Continuous Casting technological process were investigated systemically. The morphology, size, composition and origination of the inclusions were analyzed. It is concluded that the inclusions in the slabs are mainly small-sized angular alumina inclusions and alumina clusters (<40 μm), while the larger ones together with the resultants of reaction between ladle slag and molten steel were removed by floating out during casting. The total oxygen of the slab is in the range of (14-16)×10-6 and the amount of the inclusions in the slabs changes from 0.09 -0. 15 mg/kg, Which indicate the high cleanliness of the slabs.
Abstract: A new measuring method and a technical scheme of recognition system are proposed, which estimate the BOF final point by analysing the texture features of the flame images obtained from converter vessel mouth. Major work include the flame images collecting, preprocessing, computing and selecting the texture features, and analysing and comparing these features. An application program was also worked out. According to the data obtained from experiment, it is demonstrated that this method and technical scheme are feasible. The scheme avoids the difficulty of complicated mechanism modeling, has no request of the vessel mouth size, and costs comparatively low. It is suitable for medium or small size converters.
Abstract: The phenolic aldehyde were synthesized and then were carbonized to make carbon materials of the resin. The elements and structure of carbon materials of the resin were analyzed. The results found that the carbon materials of the resin treated at 620℃ have weekly appeared (100) crystal plane diffraction peak, it means that some graphite crystallite have produced. But the graphitization degree of the carbon materials of the resin treated at 1000℃ is still lower, and it is belong to the range of amorphous carbon. All the elementary mass fraction of the carbon materials of the resin are regularly changed with the treatment temperature increase, thereinto carbon content is accretion, hydrogen and oxygen contents are decline. The disengage speed of hydrogen is higher than that of oxygen in the same carbonization condition. Both temperature and ambience are all the factor of effect on the specific surface of the carbon materials, and the effect of ambience is more intensity.
Abstract: The phenolic aldehyde were carbonized to make the resin carbon.The charge and discharge performance of the lithium ion cells used the resin carbon materials as the electrodes were analyzed. The result indicated that there is an optimal carbonized temperature range for resin carbon being used as electrode of lithium ion cells. And for the phenolic aldehyde carbon, the optimal carbonized temperature is about at 700℃. The specific surface of the resin carbon is an impolrtant factor effecting on the electrochemical properties of the lithium ion cell. The bigger the specific surface of the resin carbon is, the higher the capacity of the cell.
Abstract: With the ultrafine W powder (0.35 μm) and carbon black powders of various shes(0.1, 0.3, 0.8, 4.5 μm), the influences of carbon black pride size and carburization temperatures(830-1300℃ for 40 min) on the compounded carbon content and phase compositions in WC powders were investigated at the atmosphere of H2. The adding amount of carbon was determined under the reaction equation of W+C=WC. The phase compositions of the reacted products were analyzed by XRD. The experimental results demonstrated that when ultrafine carbon of 0. 1 μm was used, the compounded carbon content in the WC powders was up to 5.8%(mass fraction), corresponding to 95% of the theoretical content, at very low temperature of 850℃; when the temperature was higher than 930℃, the carbon content of WC powders approached the theoretical one. It is concluded that carburization can be completed at very low temperature when the ultrafine carbon black powders are used, in which the ultrafine W particles are carbonized before the they begin to grow and form W aggregation.
Abstract: The texture of interconnecting aluminum films prepared by conventional and modified technology was examined using X-ray diffraction It is demonstrated, that the high volume fraction and high sharpness of the { 111 } fiber texture will drastically reduce the invalidation ratio of very large-scale integrated electronic circuits. The reasons of invalidation and the positive effects of the {111 } fiber texture are discussed. It is pointed out, that attention should be paid to the corresponding texture problems in new interconnecting copper films.
Abstract: The match relationship among technological conditions of Cu-Cr alloy, during continuous unidirectional solidification has been studied. Microstructure of Cu-Cr alloy and the reason for formation of surface defect in Cu-Cr alloy have been analyzed. The best technological conditions are:height of mold is 10-25 mm, cooling distance is 25 mm, melting temperature of Cu-Cr alloy is 1 280℃, Withdrawal speed is 0.24-1.00 mm/s, amount of cooling water is 720 L/h.
Abstract: One kind of the method of curbing plate bending in jobbing sheet rolling process has been researched. For the first time,the method of using smaller lower working roll is put forward with formula and practical data for curbing plate bending caused by temperature difference in the section of plate. So, the choice of rolls diameter can be guided in practical production.
Abstract: Mathematical models of 1700mm hot strip mill are developed for couple in combined shape and gauge control system. Computing relative gain matrices of the combined system is to the effect that decoupling control is indispensable for the production of strip with high quality.
Abstract: The distribution of the Stress in casing connection, the value of make-up torque and thread off load are studied when the casing connection is assembled or loaded with internal pressure and axial tension, which are very important for gluing, leakage and thread off failure analysis. The comprehensive experimental research on casing connection is completed by advanced full-scale experimental at present, and the experimental result is analyzed. The cognitive level is raised by results of experiment and analysis for mechanical properties of casing connection. and the useful data are provided for the further research in theory.
Abstract: The problem of the disturbance decoupling for a class of nonlinear control systems is discussed. The necessary and sufficient condition has been proved under which the nonlinear systems can keep decoupling with a feedback controller by researching the regular of the systems.
Abstract: A compleled method of Calibration of Lens-induced Distortion is discussed,which on a test photographing. It is described as following:take some pictures on a test target; the signs on the pictures are marked and matched by computer automatically; the parameters of lens-induced distortion can be calculated using least square procedure. The algorithm of automatic marking and matching test target is detailed, which contains several approaches:image pre-processing, image binaryzation, image segmentation, sign thinning, line linking, sign recognition, calculating coordinates, grid rebuiding and grid marching. A completed system is implemented based on this algorithm and shows its feasibility and validity in actUal usage.
Abstract: In order to obtain the essence relation between mobile platform and manipulator, wheeled mobile manipulator's optimal configuration was discussed based on simplified mobile manipulator and equivalent mass matrix, then the relation between the direction of maximal manipulability and mobility manipulator's configurations was derived. The relation will be a base for further investigating mobile manipulator's coordination.
Abstract: Using the superposition property of linear partial differential equation finds the solution of piecewise-time-carburization diffusion equation for the carburization process of the objects in oven, and obtains the carbon concentration distribution function with the boundary condition of type 3.The method can describe the physical behavors of the piecewise-time-carburization diffusion equation in each time in terval.
Abstract: The convergence of perry and Shanno's memoryless quasi-Newton method with parameteers is analyzed.lt is proven that Perry and Shanno's memoryless quasi-Newton method with inexac line searches for on-convex objective function converges when parameters are in the given range.
Abstract: Base on the basic principle of AHP(Analytic Hierarchy Process), a modelling processing of the possible schemes in the process of personnel distribution reform is guven. Weight vector for each scheme is obtained by calculation, thus providing the administrators with a quantitative basis for their decision-making. It can offer a quantitative approach to decision-making in personnel management so that the subjectivity and arbitrariness in qualitative decision-making can be reduced.
Abstract: The factor system of enterprise's innate technology quality is set up. The power and the membership grade function of each factor are defined. Composite algorithm is designed. The result of the methods has been tested through empirical research.
Monthly, started in 1955 Supervising institution：Ministry of Education Sponsoring Institution：University of Science and Technology Beijing Editorial office：Editorial Department of Chinese Journal of Engineering Publisher：Science Press Chairperson：Ren-shu Yang Editor-in-Chief：Ai-xiang Wu ISSN 2095-9389CN 2095-9389
