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1.
为了减少废旧锂离子电池对环境的污染,实现有价资源的回收利用.文章通过柠檬酸酸浸废旧锂电池正极材料,对浸出Co2+的过程进行研究,考察了柠檬酸的浓度、酸浸温度、固液比及酸浸时间等影响因素对Co2+提取率的影响,结果表明其最佳工艺条件:柠檬酸的浓度1 mol/L、固液比为3g/100mL、恒温水浴70℃、酸浸时间120min,Co2+的提取率达到了96％. 相似文献
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二次酸浸法提取煤灰中的氧化铝(英文) 总被引：1，自引：0，他引：1
Pei-wang ZHU Hua DAI Lei HAN Xiu-lin XU Le-ming CHENG Qin-hui WANG Zheng-lun SHI 《浙江大学学报(A卷英文版)》2015,(2):161-169
目的:煤灰渣酸浸提铝通常效率不高,主要因为灰渣中存在含铝晶体矿物(如莫来石、尖晶石和长石等)。为解决含铝晶体不易与硫酸反应的问题,本文提出二次酸浸提铝法。创新点:基本实现铝硅分离,第一步酸浸实现非晶态铝的浸出,残渣经焙烧和水浸后,第二步酸浸实现剩余铝的浸出。方法:1.一次酸浸时,硫酸直接与煤灰渣反应浸出部分氧化铝,提铝残渣加碳酸钠焙烧后,含铝晶体遭到破坏;2.焙烧产物经水浸溶解出硅酸钠,水浸残渣做X射线衍射分析表明其主要为铝硅非晶体活性物质,此时可用硫酸在温和条件下浸出剩余的铝。结论:1.一次酸浸提铝在10 mol/L硫酸、120°C、2 h和1:2固液比的条件下,铝浸出率为81.72%;2.用5 mol/L硫酸二次酸浸时,20°C下铝浸出率已经达到87.31%,100°C下更是达到99.06%;3.综合两次酸浸结果,铝的浸出总效率在97%以上。 相似文献
3.
以内蒙古呼伦贝尔地区煤矸石为原料,采用高温煅烧活化,盐酸酸浸法溶出Al2O3,以Na2CO3作为碱化剂制备聚合氯化铝(PAC),研究酸浸条件、聚合条件对制备PAC的影响。实验结果表明：酸浸最佳条件为每10g粒径200目煤矸石样品,在750℃高温活化2h,用3.5mol/L盐酸35mL酸浸2h,扎赉诺尔矿区煤矸石在80℃酸浸条件下Al2O3溶出率最高达到24.41%,而伊敏矿区和大雁矿区煤矸石样品则在85℃时酸浸,Al2O3溶出率分别达到最高值22.4%和21.6%。以扎赉诺尔矿区煤矸石为研究对象,在酸浸液中加入3.0g Na2CO3,80℃时聚合2h,可得到淡黄色液体聚合氯化铝,通过红外光谱分析,在1008cm-1和1071cm-1处出现Al-O-Al弯曲振动产生的特征吸收峰,说明氯化铝转变为聚合氯化铝。在自来水中加入体积比5... 相似文献
4.
介绍金化学发展近况和氰化浸金体系中几种新工艺的化学理论，讨论了浸金配合物的微观结构特征，综述了非氰化浸金体系中的新理论。 相似文献
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采用焙烧、碱浸、酸浸、水解、置换、结晶的工艺从锡阳极泥中回收锡、铋、铜、铅,工艺路线短、操作简便,收率可达80%以上. 相似文献
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介绍了ＰＬ－金属酸浸时滞值测量仪的化学检测原理及方法。该方法测量ＰＬ值快速、简便、准确，具有良好的应用前景。 相似文献
8.
万莉 《小学生之友(智力探索版)》2004,(11)
一想起农运会开幕式的操排,我的心里就像打翻“四味”罐——酸、甜、苦、乐,味味独特。操排是酸的。老师说:“纪律必须严明。”这不,为了定队形、齐队容,往往一站就是一两个钟头,那腿啊又酸又软,像浸饱了醋的萝卜条,一走起来,不停地哆嗦。 相似文献
9.
研究了用细茵氧化地浸乏溶液中Fe^2 时,细茵数、Fe^3 ／Fe^2 的比值在不同条件下随时间的变化,结果表明,乏溶液中的氮盐、磷盐可基本满足细茵代谢的需要,并对生物地浸工艺进行了初步讨论。 相似文献
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庄友刚 《常熟理工学院学报》2007,21(7):1-6
现代性批判是历史唯物主义的基本出场语境。马克思的现代性批判存在着二重维度。这种状况使得历史唯物主义在当代风险社会语境中面临一些基本的理论问题和理论挑战，需要做出相应的理论调适。当代风险社会是现代性发展的直接后果，对风险社会的批判最终要指向对全球资本关系的批判，因而风险社会批判需要以历史唯物主义为理论基础，遵循历史唯物主义现代性批判的历史逻辑。风险社会语境与历史唯物主义现代性批判逻辑的结合就是历史唯物主义的风险社会理论，历史唯物主义风险社会理论是历史唯物主义在风险社会语境中的当代出场。 相似文献
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Black and white kindergarten and second-grade children were tested for accuracy of detection and recognition of orientation and location changes in pictures of real-world and geometric figures. No differences were found in accuracy of recognition between the 2 kinds of pictures, but patterns of verbalization differed on specific transformations. Although differences in accuracy were found between kindergarten and second grade on an initial recognition task, practice on a matching-to-sample task eliminated differences on a second recognition task. Few ethnic differences were found on accuracy of recognition, but significant differences were found in amount of verbal output on specific transformations. For both groups, mention of orientation changes was markedly reduced when location changes were present. 相似文献
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Dr. Cecilia L. López Howard J. Sullivan 《Educational technology research and development : ETR & D》1992,40(4):5-14
This study investigated the effects of three levels of personalization—individualized, group, and non-personalized—on the
mathematics achievement of 123 seventh-grade Hispanic boys and girls. Personalization was accomplished by using personal information
provided by students on a biographical inventory. Subjects were randomly assigned within sex to one of three versions of a
two-day instructional program on one-step and two-step mathematics word problems. Subjects in both the individual and group
personalization treatments scored significantly higher on the posttest than those in the nonpersonalized treatment on two-step
word problems, but not on one-step problems. Subjects in the individualized treatment had significantly more positive attitudes
toward the instruction than those in the other two treatments. 相似文献
14.
普通话水平测试员应具有的素质 总被引：1，自引：0，他引：1
普通话水平测试是新时期推普工作的重大举措，担任主要测试工作的测试员肩负着这一重任，如何全面提高测试队伍的测试水平，增强测试员自身的素质是保征这一举措实施的关键。依据在测试工作中的深刻体会和思考，对普通话测试员应具有的专业素质和政治素质进行评述。 相似文献
15.
教育新闻,尤其是与高校相关的新闻在媒体中占据着重要位置。教育新闻在潜移默化中影响着大学生的人生观和价值观。如何增强高校教育新闻的思政功能成为一项重要的时代课题。当前媒体对高教新闻关注度很高,但也存在价值导向错误、贴近性不强、正面新闻报道较少等问题,有必要探索进一步发挥高校教育新闻思政功能的策略。 相似文献
16.
为了全方位培养学生的工程能力,文章提出了在化工原理的各个教学环节中,应该有侧重地培养学生的工程能力。在理论教学中应该侧重培养工程观念;在课程实验中应该引导学生理解实际问题的复杂多样性;在课程设计中应该注重培养学生的工程思维;在课程实习中应该着重培养学生的工程实践能力。 相似文献
17.
Performances of fourth and sixth grade children who had been in a program based on Science—A Process Approach were compared with performances of control groups on two conservation-of-volume tasks. The fourth grade children who had had Science—A Process Approach performed at a higher level than the control group on one of the tasks. There were no other significant differences between groups. The volume tasks were analyzed and learning hierarchies devised. A test based on the hierarchies was constructed and administered to all (189) children. An instructional program based on the hierarchies was carried out with approximately half of the children in each school at each grade level. All children were then post-tested on the volume tasks and the tasks of the learning hierarchies. All groups who had deceived instruction had higher mean scores on the Learning Hierarchies Test but no group made a significant improvement on the volume tasks. Performance of the volume tasks was found to be related to age and score on the Learning Hierarchies Test. 相似文献
18.
孙同梅 《新乡师范高等专科学校学报》2003,17(2):122-123
普通高校在人才大战中人才外流现象严重,引进高层次人才困难,要改变这一被动局面,必须树立切合实际的人才战略观:1.以用为主,防止人才“异化”;2.重视大科学时代的人才成长群体效应;3.依靠校内师资,发挥自身优势;4.重视人才管理,充分发挥引进人才的作用。 相似文献
19.
Six experiments on learning in honeybees were prompted by the possibility that results previously attributed to a difference in amount of reward (20- versus 5-μl drops of sucrose solution presented on colored targets) might be due at least in part to a difference in delay of reward attendant on greater difficulty in locating the 5-μ1 drops. Substantial reduction in the diameter of the targets, which was designed to facilitate location of the drops, impaired discrimination of the colors, perhaps because their salience was reduced in the process (Experiment 3). White dots used to mark the location of the drops on larger targets also impaired discrimination of the colors, which presumably were overshadowed by the dots (Experiments 1, 2, and 4). That the dots did not serve merely to equate delay but were themselves discriminated was demonstrated in Experiment 5, which produced as well the first indication of an effect of amount of reward uncontaminated by the possibility of differential delay: Animals trained with a 5-μl drop on a dotted target of one color and a drop of the same size on an undotted target of a second color preferred the dotted target, but animals trained with a 5-μl drop on a dotted target of one color and a 20-μl drop on an undotted target of a second color preferred the undotted target. In Experiment 6, with odors substituted for the colors on the assumption that they were less likely to be overshadowed by the dots, what could be interpreted as a pure amount effect was found again. Aside from their relevance to questions about the role of amount of reward, the results have some interesting implications for the theory of discriminative learning in honeybees. 相似文献
20.
孙静 《新乡师范高等专科学校学报》2010,24(6)
自1898年严复的《天演论》出版以来,相关研究从未间断过,但大多研究是针对译者的翻译思想以及使用的翻译策略,很少有人关注不同时代译者、读者及出版机构等对其所作的不同批评。文章通过对比严译《天演论》在不同时代得到的不同评价,旨在说明多元系统理论并非仅对译者的翻译过程产生影响,针对译作的批评也同样会受到影响。 相似文献