响应曲面法优化锯末磁化还原高炉灰工艺研究

利用锯末为焙烧高炉灰提供还原气氛,回收高炉灰中的铁,在绿色节能的同时实现高炉灰资源化利用。通过响应曲面法设计分析了焙烧温度、焙烧时间和还原剂配比对磁选精矿中铁品位、回收率的影响,并建立自变量与响应值间的数学预测模型,确定了磁化焙烧回收高炉灰中铁的最优工艺条件：焙烧温度686.65 ℃、焙烧时间25.03 min、还原剂配比1︰8.6,在此条件下得到预测磁性铁品位68.325%、回收率90.945%,试验验证值与模型预测值相差在0.3%以内,表明该模型优化结果可靠,可应用于锯末磁化焙烧高炉灰提铁过程。     

铜渣-生物质复合球团微波还原回收铁试验研究

铜渣中铁含量在30%~45%,高于工业可采铁矿石品位,但铜渣中的铁主要以橄榄石形式赋存,提取回收难度大。以铜渣为原料,生物质碳为还原剂,采用微波还原—磁选工艺回收铜渣中铁资源。研究表明：铜渣生物质复合球团的最佳还原工艺为：还原温度1 473 K、还原时间90 min、CaO添加量为铜渣质量的15%,磁选后铁精矿中铁的品位可达85.9%,铁回收率为89.1%。     

铜渣熔融还原回收铁试验研究

以铜浮选尾渣为原料,采用直接熔融还原—磁选的方法回收铁,探讨了在焙烧温度为1 350℃时,碳粉、氧化钙用量及焙烧恒温时间对还原渣磁选过程铁回收率与铁精矿品位的影响。结果表明,在碳粉和氧化钙添加量分别为铜渣质量的32%和10%、恒温100min的条件下对浮选尾渣进行熔融还原,焙烧后的产物破碎磨细至-0.074mm占85%,再进行弱磁选,可获得铁品位为67.47%的还原铁精矿,铁回收率为92.32%。     

高炉灰为还原剂对海滨钛磁铁矿直接还原焙烧磁选--钛铁分离的影响

对高炉灰在直接还原焙烧-弱磁选工艺中用作印尼某海滨钛磁铁矿还原剂的可行性及其机理进行研究.结果表明,以萤石为添加剂的条件下,高炉灰可代替煤做还原剂,通过高炉灰与萤石的共同作用,可以在直接还原过程中提高还原铁粉中铁的回收率及品位并降低TiO₂质量分数,同时回收高炉灰中铁.三种不同产地高炉灰还原效果的比较表明,高炉灰性质对还原效果有影响.在相同用量条件下,津鑫高炉灰(JX)还原效果最好;在JX高炉灰用量30%、萤石用量10%、焙烧温度1250℃以及焙烧时间为60 min时,焙烧产物通过两段磨矿和两段磁选,最终得到最佳的还原铁粉中铁品位为91.28%,TiO₂质量分数降至0.93%,包括海滨砂矿和高炉灰中铁的铁总回收率达到89.19%.      

铜冶炼渣选铜尾矿还原焙烧—磁选回收铁工艺研究

以炭粉为还原剂,通过还原焙烧—磁选工艺从铜冶炼渣选铜尾矿中回收铁,考察了影响铁回收效果的主要工艺参数,并通过试验验证。结果表明,在炭粉用量为铜渣量的25%、氧化钙用量为铜渣量的10%、焙烧温度1 300℃、焙烧时间1.5h、焙烧产物磨细度为-0.074mm占55%的条件下,磁选精矿(即还原铁粉)铁含量可达92.16%,尾矿铁含量可降低至3.91%,铁回收率87.65%。     

从铜渣中回收铁的研究现状及 其新方法的提出

对铜渣进行XRD物相、扫描电镜和能谱以及主要元素含量的分析,指出从铜渣中回收铁的困难.综述了国内外从铜渣中回收铁的一些主要工艺方法及其优缺点,并提出弱氧化焙烧-磁选处理铜渣的新方法.铜渣和CaO的质量比为100:25,CO₂和CO的气体流量分别为180 mL/min和20 mL/min,焙烧温度1 050 ℃,保温焙烧2 h后,冷却后破碎磨细至0.074 mm,再通过170 mT的磁场磁选分离得到铁精矿.获得了铁品位54.79 %的铁精矿和含铁22.12 %的磁选尾矿,铁的回收率为80.14 %,基本实现了铜渣中铁的回收.      

酒钢镜铁矿尾矿再选试验

酒钢选烧厂排出尾矿中尚含有25%左右的铁,具有较高的回收价值。该尾矿中铁主要赋存于赤褐铁矿中,其次赋存于菱铁矿和磁铁矿中。为了回收尾矿中的铁,以兰炭作为还原剂,对该尾矿分别进行了磁化焙烧—弱磁选和强磁选—磁化焙烧—弱磁选研究,结果表明,未经强磁选预处理时,可得到铁品位54.50%,铁回收率86.26%的最优指标,该指标与目前现场指标接近;经强磁选处理后,可得到铁品位53.96%,铁回收率80.22%的最优指标,此流程在铁品位和回收率下降不多的前提下大大减少了焙烧和后磁选过程处理量,减少了能源的损失。     

磁化焙烧对高铁铝土矿中铁元素的分离回收影响

对铝土矿进行磁化焙烧—磁选处理,考察氢气通入量,焙烧温度及焙烧时间对铁回收率和品位的影响,并研究不同焙烧条件下矿石中铁元素的分离规律。结果表明,当氢气流量为40mL/min、400℃焙烧75min后,铝土矿中铁的回收率及回收品位最优,分别为69.58%和44.59%,能较好实现铁质元素的分离和回收。该条件下焙烧磁选后的铝精矿氧化铝的实际溶出率为86.2%,比未经过焙烧磁选的铝土矿提高了6.6个百分点。     

从铜熔炼渣中回收铁的研究

模拟链篦机-回转窑工艺直接还原磁选回收铜渣尾矿中的铁,试验研究了碱度、预热温度、预热时间、还原温度、还原时间及煤矿比等因素对铁精矿质量的影响.结果表明:碱度为0.3,预热温度为1 000℃,预热时间为9 min,还原温度为1 200℃,还原时间为70 min,煤矿比为2∶1,焙烧矿球磨时间为20 min(小于0.074 mm,占95%左右)以及磁场强度为0.08 T的条件下,铁品位及回收率均达到90%以上.     

混合稀土精矿还原焙烧磁选工艺研究

利用还原焙烧技术将内蒙古某混合稀土精矿中铁矿物还原为金属单质,经过磁选分离实现了铁与稀土、铌等元素的高效分离及富集。通过单因素实验考察了还原温度、焙烧时间、配碳量条件对还原焙烧效果的影响,以及不同焙烧温度下稀土和铌富集、回收的情况。在焙烧温度1 175℃,焙烧时间90 min,配碳量C/O为1.5的优化条件下,铁金属化率达到92.52%,磁性物中铁品位为89.71%,铁回收率为92.12%,而非磁性物中铌品位及回收率为3.85%和87.92%;稀土品位及回收率达到7.15%和88.23%。     

深云立交桥梁检测及加固改造

根据深云立交桥梁的检测结果，对该桥目前的整体状况、工作状态，及其使用情况做出综合评价，对桥的病害原因进行了分析，并提出合理的加固方案。     

Status and solidarity in social comparison: Agentic and communal values and vertical and horizontal directions.

Social comparison involves positioning the self relative to others on a vertical or status dimension (ranging from upward to downward comparisons) and a horizontal or solidarity dimension (ranging from contrastive to connective comparisons). Across 3 studies in which 389 undergraduates recorded everyday social comparisons (n = 4,417), downward and connective comparisons were rated as more helpful and mood enhancing than upward and contrastive comparisons. The effects of horizontal comparisons were greater for people for whom solidarity was an important value; however, the effects of vertical comparisons were not greater for people who valued status. The roles of the comparison target, topic, and situation were also explored; for example, noticing undesirable features of the target enhanced status but undermined solidarity. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

材料科学技术转型发展与钢铁创新基础设施的建设

摘要：在第4次工业革命浪潮的推动下,钢铁科学与技术正在经历数字化、智能化转型。钢铁行业全流程各工序均为“黑箱”,为多场、多相、多变的巨系统,具有复杂相关关系和遗传效应等。这些不确定性带来了巨大的挑战。挑战和机遇并存。这些不确定性提供了智能化和数字化技术的应用场景资源;钢铁行业极为丰富的大数据提供了挖掘其中蕴含客观规律的数据资源;现代的数据科学、智能技术为解决不确定性问题提供了强大的手段。以数据为中心,以工业互联网为载体,以实验工具、数字数据、计算工具为支撑,建设钢铁企业材料创新基础设施,将可以大幅度提高研发效率,降低研发成本,有力地支撑钢铁材料科学与技术的转型发展。实验工具平台除了传统的实验室仪器装备和中试装备之外,实际生产线被作为主要的实验工具。这些实验工具提供丰富、精准、写实的历史数据和现实生产数据,特别是生产线装备提供实际生产大数据,蕴含着生产过程中的全部规律,是极宝贵的数据资源。利用机器学习、深度学习等现代数据挖掘技术为计算工具,对这些数据资源进行处理、分析、计算,将数据转换为高保真度模型,可以得到具有“原位分析能力”的数字孪生。在工业互联网的总体架构下,以数字孪生为核心,组成信息物理系统,构建起基于数据自动流动的状态感知、实时分析、科学决策、精准执行的闭环赋能体系,解决生产制造、应用服务过程中的复杂性和不确定性问题,提高资源配置效率,实现资源优化,对材料行业转型发展提供关键技术支撑。虚实映射、实时交互、精准控制的信息物理系统与材料创新基础设施合二为一,以材料创新基础设施为基盘,形成具有“原位分析能力”的数字孪生,建设钢铁生产全流程、一体化的信息物理系统,必将推进钢铁行业智能制造蓬勃开展和数字化、智能化转型。     

Voices of fear and anxiety and sadness and depression: The effects of speech rate and loudness on fear and anxiety and sadness and depression.

Two studies investigated the role of expressive vocal behavior (specifically, speech rate and loudness) in fear and anxiety and in sadness and depression. In the 1st study, participants spoke about personally experienced fear and anxiety-arousing and neutral events using 3 different voice styles: fast and loud, normal, and slow and soft. In the 2nd study, participants spoke about personally experienced sad or depressing and neutral events using the same 3 voice styles. In both studies, the participants' highest levels of subjective affective and cardiovascular (CV) arousal occurred when they spoke about the emotional events in a mood-congruent voice style: fast and loud in the case of fear and anxiety, and slow and soft in the case of sadness or depression. Mood-incongruent voice styles canceled the heightened levels of CV arousal normally associated with these negative emotions. The voice-style manipulation had no significant effect on the participants' levels of CV arousal during the neutral discussions. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Praise and Blame and Robinson.

Daniel Robinson suggests that much of the civil and criminal law "serves as the institutionalized form of praise and blame". Indeed it does. Pulling at this thread of Robinson's tapestry leads the reader straightaway to a host of truths about how law and morality not only intersect, but work together in harmony. "[L]aw", Robinson says, is a "vivid expression of deeper and impenetrably complex moral theories". This essay explores several of these harmonies, but focuses on two. One is that political society must be seen as the cooperation of free persons according to law, which persons hold common moral understandings. The second has to do with retribution as the moral justifying aim of punishing criminals. The author goes beyond Robinson's limited praise of retribution, and shows that some central features of our practice of punishment are understandable only within the retributive framework. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

钢铁产品交易与展示平台的设计与应用

为解决单个企业的信息化投资风险、从整体上降低企业信息化投入,针对大邱庄钢铁产业的类型特点,设计了一种新型信息化公共服务平台。详细阐述了钢铁产品展示及交易平台的建设内容及系统开发技术。该平台集产品展示、信息查询、用户管理功能于一体,实现了全自动、全智能的在线管理和维护,适用于中小型企业。该平台的应用最大化地发挥了大邱庄的产业优势,对大邱庄工业园区的宣传和市场开拓起到了一定的作用。     

《儿子与情人》的语码转换与男女二元对立

劳伦斯小说《儿子与情人》一个鲜明的语言特色就是标准英语和当地方言频繁的语码转换。莫瑞尔用方言来对抗妻子,而妻子坚持用标准英语,偶尔也用方言来讽刺、挖苦丈夫。语码转换反映了劳伦斯男女二元对立的哲学思想。     

Aging and negative affect: The rise and fall and rise of anxiety and depression symptoms.

The relationship between aging and negative affect is dynamic and complex. Although prior studies have often cited lower prevalence rates of anxiety and mood disorders among older individuals, these studies may miss the dynamic relationship between symptoms and aging. To evaluate a nonlinear model of the relationship between aging and negative affect, the author examined measures of neuroticism, anxiety, and depression symptoms in a cross-sectional, community sample (N = 335), ages 18 to 93. Results indicated a curvilinear relationship, with mean symptom levels increasing during early adulthood (until the mid-30s) and then showing a small decline until older adulthood (the mid-70s), when symptoms again increase with age. (PsycINFO Database Record (c) 2010 APA, all rights reserved)