蔗糖还原浸出锰阳极泥中锰的研究

采用蔗糖还原浸出阳极泥中的锰,通过正交实验和单因素实验,探讨了搅拌速率、液固比、反应温度、反应时间、硫酸浓度、蔗糖浓度等因素对阳极泥锰浸出率的影响,正交实验表明,各因素影响锰浸出率的大小顺序为:硫酸浓度蔗糖浓度浸出温度浸出时间。较优的工艺条件为:硫酸浓度3.5 mol/L,蔗糖浓度70 g/L,液固比为4∶1,搅拌速率100 r/min,反应温度70℃,反应时间40 min,锰浸出率达到98%。     

响应曲面法优化木薯渣—硫酸浸取软锰矿工艺的研究

探究木薯渣为还原剂在硫酸存在下浸取软锰矿中锰工艺条件,通过单因素试验和响应曲面试验,考查了木薯渣用量、液固比、硫酸浓度、温度以及反应时间对浸出结果的影响,实验表明:在取10g软锰矿进行试验时,浸锰最佳工艺条件为木薯渣用量5 g,硫酸浓度为3 mol/L,反应时间为150 min,温度是80℃,液固比为10∶1,其浸出率达到94.08%。     

甲酸—硝酸还原浸出低品位软锰矿

用甲酸为还原剂在硝酸体系中浸取低品位软锰矿,通过单因素试验和响应面法考察了甲酸用量、硝酸浓度、液固比、反应时间和反应温度对锰、铁、铝浸出率的影响。结果表明,当甲酸用量一定时,影响锰浸出率的因素主次依次是液固比、硝酸浓度、反应时间和反应温度。当甲酸用量为3 mL、硝酸浓度0.45mol/L、液固比5.6、反应温度90℃、反应时间2.5h时,锰、铁和铝的浸出率分别为91.01%、43.06%、21.61%。     

木薯渣—硫酸法浸出低品位软锰矿试验研究

研究了用木薯渣─硫酸法浸出低品位软锰矿,即以木薯渣作还原剂,在硫酸溶液中浸出低品位软锰矿。通过正交试验,考察了硫酸初始质量浓度、温度、固液质量体积比和反应时间对锰浸出效果的影响。结果表明,对锰浸出率影响较大的依次为温度、硫酸初始质量浓度、反应时间和固液质量体积比。单因素试验结果表明:锰浸出率随温度升高、硫酸初始质量浓度增大、反应时间延长和木薯渣添加量增加而提高;在温度90℃、硫酸初始质量浓度200g/L、反应时间4h、固液质量体积比1∶15、木薯渣与软锰矿质量比1∶6.79条件下,锰浸出率达97.32%。     

用硫酸从锡尾矿中浸出铁试验研究

研究了用硫酸从锡选矿尾矿中浸出铁,考察了反应时间、硫酸浓度、液固体积质量比和反应温度对铁浸出率的影响,通过正交试验确定了各因素影响主次及适宜浸出条件。结果表明:铁浸出率随反应时间延长,硫酸浓度、液固体积质量比及反应温度升高而提高;各因素影响顺序为反应温度硫酸浓度液固体积质量比反应时间;在反应温度70℃、硫酸浓度1.5 mol/L、液固体积质量比4 mL/g、反应时间90 min适宜条件下,铁可以完全浸出。     

从高铁氧化锰矿石中浸出锰、铁试验研究

研究了在硫酸溶液中用蔗髓为还原剂从高铁氧化锰矿石中浸出锰和铁,考察了硫酸浓度、液固体积质量比、还原剂用量、温度和浸出时间对锰、铁浸出率的影响,并借助XRD和SEM对锰矿石浸出前后物相的变化进行表征。结果表明:高铁氧化锰矿石的主要物相为MnO_2、FeO(OH)、SiO_2及MnFe_2O_4等;锰和铁的浸出呈显著线性正相关;对于10.0g锰矿石,在还原剂用量1.50g、液固体积质量比5∶1、硫酸浓度7.36mol/L、温度90.0℃、反应时间180min条件下,锰、铁浸出率分别达93.3%和87.0%,浸出效果较好。     

混生锰矿的直接酸浸法及其影响因素分析

在硫酸介质中以蔗糖为还原剂浸取混生锰矿中的锰,通过单因素试验及响应面法分析了硫酸浓度、蔗糖用量、反应时间和反应温度等因素对浸出过程的影响。结果表明,在硫酸浓度5.52mol/L,蔗糖用量13.33g/L,反应时间160min和反应温度90℃的优化条件下,锰的浸出率为92.48%。     

从废旧电池正极材料低酸浸出渣中高压酸浸钴镍锰锂试验研究

针对废旧电池正极材料低酸浸出渣常压酸浸钴、镍、锰生产效率低、回收率不高等问题,研究了采用高压酸浸工艺浸出有价金属,考察了硫酸浓度、液固体积质量比、温度、反应时间、还原剂种类及加入量对钴、镍、锰、锂浸出率的影响。结果表明:在硫酸浓度4.0mol/L、液固体积质量比8.0mL/g、温度140℃、反应时间120min、还原剂五水硫代硫酸钠用量0.5g/8g渣条件下,钴、镍、锰、锂浸出率均在99%以上,钴、镍金属损失率不到0.2%,且浸出渣可循环利用,具有较好的工业应用价值。     

甲酸-盐酸还原浸出低品位软锰矿

研究了以盐酸为介质,用甲酸还原浸出低品位软锰矿,考察了盐酸浓度、甲酸用量、反应时间、反应温度及液固体积质量比对锰、铁、铝浸出率的影响。结果表明:各因素对锰浸出率的影响顺序依次为盐酸浓度、液固体积质量比、甲酸用量、反应温度和反应时间;在盐酸浓度为0.3mol/L、甲酸用量为3mL、液固体积质量比为8∶1、温度为90℃、反应2h条件下,锰浸出率为93.4%,铁、铝浸出率分别为65.86%和27.54%。     

核桃壳还原浸出软锰矿的动力学

探究以核桃壳为还原剂硫酸浸出氧化锰矿过程的动力学。考察了搅拌速度、反应温度、硫酸浓度、反应时间以及核桃壳用量对锰浸出率的影响。结果表明,锰的浸出率随着搅拌速度、硫酸浓度、核桃壳用量的增大和温度的升高而增大。浸出前60 min浸出率的增长速度较快。在反应温度为369 K、硫酸浓度3.5 mol/L、核桃壳加入量40 g/L、反应时间2.5 h、转速200 r/min时,锰浸出率达93.18%。浸出过程属于化学反应控制,对应的活化能为45.5 kJ/mol,硫酸浓度和核桃壳用量的反应级数分别为0.897、0.2。     

转炉炉壳热应力分析

根据实际转炉建立实体模型。以有限元为手段,考虑了炉衬和炉壳材料的物性参数随温度变化的特点和炉衬与炉壳之间膨胀间隙,计算了转炉炉壳在温度载荷和炉衬膨胀压力同时作用下的热应力。所得结果可为转炉炉壳设计提供依据。     

焦炭热性能指标意义浅析

通过对焦炭在高炉内的历程及其变化规律的剖析,阐述焦炭热性能指标的意义,形象地把焦炭在高炉内的损耗分为三部分(M1,M2,M3)。指出M2对焦比及焦炭价格有一定的指导作用。     

Results of treatment of cancer of the cardia

Cancer of the cardia is traditionally discussed with cardiac cancer of the lower portion of the esophagus and upper gastric cancer invading the esophagus, and the specific characteristics of cancer of the cardia have never been clearly defined. We reviewed the outcome of 172 patients with adenocarcinoma of the cardia who had undergone radical surgery between 1949 and 1994 in the Division of Gastrointestinal Surgery of the Cancer Institute Hospital. The centers of the tumors were located within 2 cm above and below the boundary between the esophagus and the stomach, and their longitudinal diameter was less than 8 cm. We divided the patients into an early period (1949-1979; n = 79) and a late period (1980-1994; n = 93), and focused on the historical transition. There were no differences in patient gender or histology between the two periods. However, the late period was associated with fewer cases of esophageal invasion and shorter longitudinal diameter, as the age of the population advanced. The number of advanced cancers such as the localized and infiltrative type had decreased, and early cancer and early clinical stage had become more common, but despite the fact that the number of early cancers had increased, extended dissection, such as thoracic and paraaortic lymph node dissection, was performed more frequently. By clinical stage, the long-term outcome markedly improved in Stage I patient in the late period, and tended to improve in Stage II and III patients. This appears to have been attributable to the prevention of micrometastasis by extended dissection, although the number of early cancers is another major potential cause. There were no differences in the outcome of Stage IV patients between the two periods, and further advances in multimodality therapy must be awaited. The range of resection is basically proximal gastrectomy, and if there are adequate indications, the prognosis is favorable. In view of the status of lymphatic flow and lymph node metastasis, and long-term results, lateroaortic lymph node dissection is important. Since the number of early cancer patients has been increasing, if intraabdominal recurrence is prevented, intrathoracic lymph node dissection will contribute greatly to the outcome of such patients.     

Effect of antibiotics of chemotaxis of human leukocytes

The effect of 20 different antibiotics on chemotaxis by human neutrophils was studied. Human leukocytes incubated with chloramphenicol, rifampin, sodium fusidate, and tetracyclines in vitro showed markedly depressed migration. The mechanisms by which these antibiotics affect leukotaxis are discussed.     

Quality of life of relatives of mental patients

Usage of quality of life of psychiatric patients' relatives as the parameter of estimation of the quality of psychiatric care is considered. By means of standard questionnaire elaborated by the authors as well as by means of both individual and group conversations the quality of life was analyzed in 40 relatives which lived together with psychiatric patients. Different spheres of their life and difficulties (financial, social-psychologic, production) were examined in families with such patients. The defects of psychiatric care that had direct influence on the quality of life of the psychiatric patients' relatives are outlined.     

The effect of amount of possession of the trait of hostility on accuracy of perception of hostility in others.

Some theories of personality hold that an individual's perception of others is influenced by his own personality characteristics; more specifically, that a trait of low social value will be projected more into others, and that insight into the possession of these characteristics reduces this distortion. These 2 hypotheses were tested by having a group of college students rate each other (including themselves) on degree of friendliness or hostility. Agreement with group rating about self yielded the insight score. In general, the hypotheses were supported; the "friendly" Ss were most accurate in their perception of others, and insight was positively associated with accurate perception. From Psyc Abstracts 36:04:4HL16M. (PsycINFO Database Record (c) 2010 APA, all rights reserved)