共搜索到17455条信息,每页显示10条信息,共1746页。用时:0小时0分0秒453毫秒
investigated. Results of the kinetic analysis indicate that direct leaching of zinc sulfide concentrate follows shrinking core model (SCM). This process was controlled by a chemical reaction... from the particles surface in lower than 60% Zn conversion and lixiviant in the face with sphalerite particles. Key words: kinetics; direct leaching; sphalerite; shrinking core model (SCM); pilot......
Effect of time on copper and cobalt leaching rates 2.3 高硅白合金硫酸氧化浸出动力学方程 关于不同物料的液固反应模型,其反应速度往往与液固的接触面积,物料在液中的扩散速度,反应中生成物的扩散速度等紧密相关.物料的液固反应最为典型的一种模型是收缩核模型(Shrinking core model,SCM).在高硅白合金酸浸过程中..., indicating that it should follow the chemical reaction control of shrinking core model, and establish the corresponding kinetic equation finally. Key words: high silicon white alloy; sulfuric acid oxidation......
and Environment, Central South University, Changsha 410083, China) Abstract: The concept of fractal was applied to analyze the classical shrinking core models of fluid-solid reactions, the novel fractal shrinking core models, including interface reaction model, boundary diffusion model and intraparticle diffusion model of fluid-solid reactions are obtained based on fractal geometry. The effect......
高碱复杂氧化铜矿石酸浸动力学研究黄明清1,吴爱祥1,肖云涛1(1.北京市北京科技大学土木与环境工程学院)摘 要:为了研究某高山矿区高碱复杂氧化铜矿石硫酸浸出过程动力学,试验采用电子显微镜扫描,电子探针分析研究了矿石的化学特征;对浸出温度,矿石粒度,液固比和初始酸度等因素进行了多水平的搅拌浸出试验.结果表明,选取的各因素能显著影响矿石的浸出率和浸出速率.采用未反应的缩小核模型进行浸出动力学分析,从动力学模型,表观活化能和颗粒表层产物3方面确定表面化学反应为浸出过程的控制步骤,得出矿石表观活化能和宏观浸出速率方程,......
shrinking surface is considered. Model of Tiwari and Das is applied to nanofluid comprising of sodium alginate with copper and silver. The governing nonlinear equations incorporating the effects... and Dass’s model in two different nanofluids, namely Cu-sodium alginate and Ag-sodium alginate based Casson type nanofluids, over a non-linear permeable shrinking sheet in the presence of the viscous......
be simulated with a shrinking core model, which indicates that the control factor of the calcining process is the diffusion rate of reacting reagents in the redox process. Key words: magnesite; magnesium sulfate; CO; high-purity magnesium oxide; shrinking core model; calcining 我国高纯氧化镁(w(MgO)≥98%)的产品薄弱,急需进行开发研究[1].据近期资料报道,中国高纯氧化镁市场需求量近100 kt,而国内产量仅10 kt左右,缺口相当大.目前,我国除利用蛇纹石为原料外,还利用沿海制盐后卤水,青海水氯镁石,东北水镁石......
promote the leaching reaction. Through investigating the dynamic parameters of the process, the dynamics in accordance with the shrinking core model is found. The overall reaction rate is controlled...; dynamic; apparent activity energy; ultrasound; shrinking core model; interfacial chemical reaction  ......
......
laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China Received 21 November 2014; accepted 25 May 2015 Abstract: A modified shrinking unreacted-core model... rate can be dramatically accelerated with increasing temperature. Key words: oxy-fuel combustion; shrinking unreacted-core model; CaSO4; decomposition; CaO sintering 1 Introduction Coal is the most......
element model to discuss the characteristics of induced stress and failures initiated by tensile stress. And then put forward an initiation criterion of core discing, along with an estimation... parameters used in FLAC3D Figure 6 Numerical simulation model, all dimensions in mm: 4.1.2 Simulation of formation process of core disicng during drilling In order to view the forming process......