从含硫浸出渣中回收元素硫的研究

本文对硫化锌矿在酸性氯化物溶液中氧化浸出产生的残渣进行了提硫研究。结果表明,使用硫化铵溶液从这种残渣中回收元素硫不仅技术可行、流程畅通,而且各项工艺指标较好。在试验研究条件下,硫化铵溶液处理该渣的溶硫率大于99％,热解提硫率大于93％,硫总回收率在92％以上。研究结果表明,硫化铵溶硫——热分解提硫是一种很有前途的回收元素硫的方法。     

稀盐酸中用锌精矿还原浸出锰结核

研究了在１．０～３．０ｍｏｌ／ＬＨＣｌ水溶液中用锌硫化物精矿与太平洋底锰结核同时浸出时，锌精矿与锰结核的配比、浸出液初始ＨＣｌ浓度、浸出温度及浸出时间对２种矿物中Ｍｎ，Ｚｎ，Ｃｕ，Ｃｏ，Ｎｉ和Ｆｅ的浸出影响。结果表明，随着浸出温度升高，金属浸出率增加；只要酸足够，浸出液初始酸浓度对金属浸出率影响不大。当浸出温度为９０℃，初始ＨＣｌ浓度为１．５ｍｏｌ／Ｌ锰结核配入过剩系数为１．２，液固比约为１３：１，浸出９０ｍｉｎ时，锌浸出率大于８０％，Ｎｉ，Ｃｏ，Ｃｕ和Ｍｎ浸出率大于９８％。原料中的硫９０％以上留在浸出残渣中，主要以元素硫形式存在。     

含铜复杂金矿的无害化综合回收工艺研究

提出了一种无污染新工艺处理 含铜复杂金精矿,新工艺 的特色是 低压氨 浸出铜然 后硫代硫酸盐提取金（ 无元素硫问题,副产硫酸 铵）适宜 的低 压氨预 浸工 艺条件 为：再磨 粒度 在－ ０ ．０４５ ｍ ｍ的占６ ５ ％ 以上,浸 出温度１２０ ℃,浸 出氧压０ ．５ Ｍ Ｐａ ,氨浓度４ ５ ｇ／ Ｌ氨浸 渣可采 用常规硫 代硫盐浸金方 法方便 地提取金 研究结 果表明, 预处理阶 段铜提 取率在９５ ％ 以 上,后 续金 浸出 中金 的浸出率及 吸附率 分别在９６ ％ 和 ９９ ％ 以上,即 总金回收 率在９５ ％ 以上图 ５ ,表 ４ ,参 ９     

硫在闪锌矿硝酸“催化”常氧压浸出中的行为研究

研究了在硝酸“催化”常氧压下浸出闪锌矿时,元素硫的生成率随时间、温度、硝酸根浓度、酸度、矿石粒度等因素的变化。结果表明,元素硫的生成率仅与温度有关,当温度小于343K时,闪锌矿被溶解,其中所有的硫均转化为元素硫,而当温度大于343K时;元素硫生成率仅为80％,其余转化为硫酸根。文中还研究了浸出中所生成的元素硫的形貌。     

真空蒸馏硫磺渣提取元素硫

对硫化镍电解阳极泥提硫后硫磺渣,进行了真空蒸馏硫磺渣提取元素硫的工艺研究,并分析了影响蒸馏过程的因素.结果表明:采用真空蒸馏-冷凝方法从硫磺渣回收元素硫并得到硫磺,其形态为型硫;残渣含化合态硫可降为15.10%,无元素硫;最大脱硫率达97.08%.     

用硫酸盐化焙烧东湘桥锰矿石的探讨

在小型石英反应管中用模拟的黄铁矿焙烧气和有色冶炼厂含二氧化硫废气对东湘桥氧化锰矿石进行了硫酸盐化焙烧条件实验。考察了焙烧温度、焙烧时间、磨矿细度、添加剂种类和用量,二氧化硫浓度等条件对矿石中有价元素锰、钴和镍浸出率的影响。实验结果发现,焙烧的温度制度、磨矿细度和添加剂对各元素的浸出率有显著的影响,其它条件影响不大。可以推荐下列工艺制度:矿石细磨添加2-3％硫酸钠造粒,在400℃和700℃左右用含SO_2废气进行两段硫酸盐化焙烧,而后浸出。由此可得锰浸出率一般大于90％,最高可达97％;钴浸出率大于80％,最高亦达97％。在利用含SO_2废气时,可以利用废气余热一段加热,只要废气温度高于400℃,矿石充分磨细,也可以得到较满意的结果。     

含铜难处理金矿选择性浸出试验研究

针对某含铜难处理金矿进行了碘化法和石硫合剂(lime sulfur synthetic solution,LSSS)法的选择性浸金的研究。结果表明,在碘单质质量浓度为8g/L,浸出时间为2h的条件下,碘化法浸出金的浸出率为88.1%,而且铜的浸出率不足1%。在石硫合剂质量分数为25%,浸出时间为6h的条件下,LSSS法浸出金的浸出率仅为73.5%。对比碘化浸出和石硫合剂浸出效果可知,碘化法对该含铜难处理金矿不仅浸出速度快、浸出率高而且铜几乎不被浸出,具有很强的选择性浸金作用。     

锌加压浸出渣浮选硫精矿汞硫分离富集研究

对锌加压浸出渣经浮选后的硫精矿中的汞硫分离、富集以及硫磺回收进行研究,确定硫化铵溶液浸出过程汞硫分离和浸出母液热分解回收硫磺的最佳工艺条件.试验结果表明:在常温常压下,(NH4)2S浓度为2.5 mol/L、液固比6∶1、时间10 min的浸出条件下,硫浸出率达98.66％,汞在渣中的富集率为93.8％,浸出渣中汞含量为原矿的6倍以上;浸出母液在热分解温度94℃、分解时间90 min的条件下,硫磺回收率在98％左右,硫磺纯度符合GB/T 2449-2006工业硫磺一等品标准；硫化铵试剂可循环利用,回收率为91.76％.     

铜渣氯浸渣中有价元素分离富集工艺

用Na2S浸出-SO2沉淀法对金川公司铜渣氯浸渣中有价元素的分离和富集进行了研究,分析了浸出温度、Na2S浓度,Na2S与S0的摩尔比及浸出时间对浸出过程的影响.研究结果表明,在Na2S浓度为0.5 mol/L,Na2S与S0的摩尔比为1:4,温度为25 ℃,浸出时间为60 min的条件下,平均渣率为26.52%,贵金属平均浸出率为10.63%,浸出渣中贵金属含量为原渣的3.96倍;向浸出液中通入SO2,元素硫从浸出液中析出,元素硫的纯度可达99.08%,回收率达54.6%～74.19%.     

根瘤菌与氧化铁硫杆菌堆浸锌浸出渣的试验研究

本文采用根瘤菌与氧化铁硫杆菌分别堆浸处理湿法冶金的锌浸出渣,通过比较根瘤菌与氧化铁硫杆菌处理的锌浸出渣的锌浸出率。试验结果表明,根瘤菌处理锌浸出渣锌浸出率达到了24．12％,而氧化铁硫杆菌处理的锌浸出渣锌浸出率达到了33．86％,氧化铁硫杆菌处理锌浸出渣的锌浸出率明显高于根瘤菌。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with