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21.
以Versatic10为萃取剂从含钙、镁、钾、钠的模拟硫酸锰浸出液中选择性萃取锰。在萃取剂浓度30%、皂化率50%、相比O/A=4/1、35℃两级逆流萃取10min后,得到平均锰含量为13.5g/L的负载有机相,锰萃取率达85.34%。负载有机相和2mol/L硫酸反萃液在相比O/A=8/1、反萃温度35℃、两级逆流反萃的条件下,得到平均锰含量为107.89g/L的反萃后液,锰反萃率达99.94%,其中钙、镁、钾、钠的浓度均小于15mg/L。反萃后液经活性炭吸附、浓缩结晶并干燥后,获得了满足电池级高纯硫酸锰要求的一水硫酸锰产品。 相似文献
22.
介绍了分布式光纤测温系统在国内外的发展现状,阐述了基于拉曼散射测温系统的基本原理,重点分析了分布式光纤测温系统在电力电缆运维中的应用,并以实例论证了分布式光纤测温系统是电力电缆在线监测的有效手段. 相似文献
23.
24.
α-alanine was adopted as a new additive to elucidate the seeded precipitation mechanism of sodium aluminate solution. α-alanine has the inhibitory effect at the initial period of reaction, but the favorable effect in subsequent reaction. The combined effect of amino and carboxyl group in α-alanine was confirmed by investigating the effect of propionic acid, ethamine and the mixture of propionic acid and ethamine (mole ratio 1:1) on the precipitation of sodium aluminate solution, respectively. The inhibitory effect derives from the adsorption of amino or carboxyl group in α-alanine on the active surface sites of gibbsite, which was confirmed by the alleviating inhibitory effects of propionic acid, ethamine and α-alanine due to the double crystal seed mass. The semi-quantitative IR spectrum analysis of the relative concentrations of Al2O(OH)62- with the band at about 550 cm-1 and polynuclear aluminate ion with the bands at about 880 cm-1 and 635 cm-1, indicates that the dynamic balance among some aluminate species present in sodium aluminate solution is broken due to the addition of α-alanine, thus resulting in the change of the seeded precipitation ratio of sodium aluminate solution. 相似文献
25.
采用一个新工艺来处理天然钛铁矿并制备高品位的人造金红石纳米颗粒。该工艺主要包括球磨、碳热还原和盐酸浸出步骤。天然钛铁矿通过球磨处理后,颗粒尺寸会大幅度减小;后续的碳热还原会导致高钛渣的形成。在盐酸浸出工序中,重点考察了酸浸时间、温度和酸的浓度对浸出过程的影响。通过优化工艺条件,最后所得到的产品为纯度超过98.0%、颗粒尺寸为10~200nm的TiO2纳米颗粒。 相似文献
26.
氨-硫酸铵体系过硫酸盐氧化含钙镁碳酸盐低品位铜矿的浸出动力学(英文) 总被引:2,自引:0,他引:2
研究在氨?硫酸铵体系中用过硫酸盐氧化低品位铜矿浸出动力学,确定搅拌速度、浸出温度、矿物粒度及氨、硫酸铵和过硫酸钠的浓度对浸出的影响。结果表明,搅拌速度在300r/min以上时对浸出速度无影响,浸出速度随反应温度及氨、硫酸铵和过硫酸钠浓度的增大而增加。对浸出渣的EDS和物相定量分析表明斑铜矿被过硫酸盐氧化而溶解于氨?硫酸铵溶液。用产物层的界面传质和扩散控制的收缩核模型分析铜矿的溶解动力学,其表观活化能为22.91kJ/mol,同时获得了描述浸出过程的半经验动力学方程,其对氨、硫酸铵和过硫酸钠的浓度的表观反应级数分别为0.5、1.2和0.5。 相似文献
27.
28.
基于应用型人才培养目标的校企合作模式研究 总被引:3,自引:0,他引:3
合作教育是地方性本科院校培养应用型人才的重要基础。铜陵学院十分重视校地联合培养人才的工作,从校企合作实际出发,探讨了以应用型人才培养为目标的校企合作、产学结合教育模式,阐述了动态重构应用型人才培养方案、大力建设"双师型"师资队伍、创建实践教学基地的校企合作的具体内容与途径。 相似文献
29.
The leaching kinetics of low-grade copper ore with high-alkality gangues was studied in ammonia-ammonium sulphate solution.
The main parameters, such as ammonia and ammonium sulphate concentrations, particle size, solid-to-liquid ratio and reaction
temperature, were chosen in the experiments. The results show that the increase of temperature, concentrations of ammonia
and ammonium sulphate is propitious to the leaching rate of copper ore. The leaching rate increases with the decrease of particle
size and solid-to-liquid ratio. The leaching rate is controlled by the diffusion through the ash layer and the activation
energy is determined to be 25.54 kJ/mol. A semi-empirical equation was proposed to describe the leaching kinetics. 相似文献
30.
The dissolution kinetics of malachite was investigated in ammonia/ammonium sulphate solution. The effects of ammonia and ammonium
sulphate concentration, pH, leaching time, reaction temperature, and particle size were determined. The results show that
the optimum leaching conditions for malachite ore with a copper extraction more than 96.8% are ammonia/ammonium concentration
3.0 mol/L NH4OH + 1.5 mol/L (NH4)2SO4, liquid-to-solid ratio 25:1 mL/g, leaching time 120 min, stirring speed 500 r/min, reaction temperature 25 °C and particle
size finer than 0.045 mm. The dissolution process of malachite with an activation energy of 26.75 kJ/mol is controlled by
the interface transfer and diffusion across the product layer. A semi-empirical rate equation is obtained to describe the
leaching process and the reaction orders with respect to concentration of ammonia and ammonium sulphate are 2.983 0 and 0.941
1, respectively. 相似文献