铜锌废渣浸出过程中除铁的研究

针对铜锌废渣浸出液中铁含量高的问题,分别采用氢氧化铁水解法和转化黄铵铁矾法研究了铜锌废渣浸出过程中的除铁,考察了水解pH值、温度对氢氧化铁水解的影响和温度、时间、酸度、碳酸氢铵用量对沉矾效果的影响。研究结果表明:控制沉矾温度在85℃以上、时间为1h、pH在2.0～3.0范围内、碳酸氢铵用量为理论值,浸出液中铁质量浓度可低于0.25g/L,并且铜损失很少。     

从铜转炉烟灰中回收铜锌试验研究

研究了从铜转炉烟灰中回收铜、锌等有价金属。试验结果表明:用稀硫酸浸出烟灰,最佳浸出条件为液固体积质量比5∶1,温度50℃,浸出时间2h,硫酸用量10g/100g烟灰;用Fe粉从浸出液中置换铜,最佳置换条件为过铁系数30%,反应温度40℃,反应时间1h;采用针铁矿法除铁,最佳条件为反应时间4h,反应温度90℃,pH=3;以碱式碳酸锌形式回收锌,锌回收率达98.8%。     

锌冶炼渣浸出液除铁研究

锌湿法冶炼渣酸性浸出液中铁含量通常较高,分别以空气、双氧水和二氧化锰为氧化剂,对氧化中和除铁的效果进行比较,并研究了双氧水氧化中和除铁法中pH和反应温度对除铁效果的影响。结果表明,双氧水氧化中和除铁法是最佳的除铁方法,常温下pH 5以上除铁效果较好,除铁效果随温度升高而增强,且过滤性能较好。     

含锌废渣中锌的回收试验

针对含锌废渣进行了锌回收的两步酸浸取试验,分析了氧化剂浓度、固液比、浸出温度、浸出反应时间、浸出终点pH、搅拌速度等因素对锌浸出率的影响。试验结果表明:氧化剂为40%过硫酸铵,固液比为1:10,浸出液终点pH=1.5,浸出时间控制在1～1.5 h,浸出温度为常温,搅拌速度为100～200 r/min,锌浸出率达80%以上,RSD为0.87%～1.44%。     

酸浸出-沉矾湿法炼锌工业优化实践

分析内蒙古赤峰某锌冶炼厂酸浸出-沉矾工艺中沉矾渣、高酸渣渣锌偏高以及沉矾后液铁含量偏高的问题。通过采用相应的技改优化措施,不仅降低了沉矾渣与高酸渣的锌含量,同时通过调整辅料加入方式,使沉矾分梯度进行,也降低了除铁后液铁浓度,减少了辅料用量,优化措施实施后产生了可观的经济效益。     

一种低污染沉矾除铁湿法炼锌方法

专利申请号：200610101223．2 公开号：CN100374592C 申请人：赤峰红烨锌冶炼有限责任公司本发明公开了一种低污染沉矾除铁湿法炼锌方法,该方法主要包括中性浸出、低温预中和、高温高酸浸出和低污染沉矾除铁4个工艺步骤,在低污染沉矾除铁之前,     

黄铵铁矾法除铁同时浸出碳酸锰矿的研究

针对高铁锰矿浸出液铁离子浓度较高的问题,采用黄铵铁矾沉淀法除铁,并使用碳酸锰矿中和沉矾过程所释放的硫酸,研究了反应温度、反应时间、硫酸铵用量和碳酸锰矿用量对除铁率和锰浸出率的影响。结果表明,在反应温度95.0℃、反应时间180min、硫酸铵用量为理论用量的1.3倍、碳酸锰矿用量为12.0g的条件下,除铁率可达95.7%,总锰浸出率为92.9%,碳酸锰矿浸出率为88.3%。     

从高酸湿法炼锌渣浸出液中分离铁及回收铜、锌试验研究

某湿法炼锌厂浸出锌过程中产出的浸出渣中含有银、铁、锌、铜等有价金属,采用酸浸-浮选联合工艺回收银后的溶液中,Cu、Zn、Fe质量浓度分别为1．0、11．05和91．56 g/L ,硫酸质量浓度约为155 g/L。研究了用双极膜电渗析法将残酸质量浓度降到30 g/L以下,同时回收酸;脱酸后的浸出液用黄钠铁矾法和中和水解法除铁及硫化法沉锌和铜。最终铁去除率达96．32％,获得品位为19．71％的铜精矿和品位为40．40％的锌精矿。     

黄钠铁矾法除锌浸出液中铁的实验研究

研究了采用黄钠铁矾法对锌浸出液进行除铁的工艺,探究了Na+浓度、反应溶液的pH值、反应温度、反应时间等因素对黄钠铁矾法除铁效果的影响,确定了采用黄钠铁矾法对锌浸出液除铁的最优工艺条件。实验结果表明:反应溶液中应保证有足量的Na+,以Na2CO3溶液为中和剂,调节反应溶液pH值为2.5时,在80℃以上的恒温条件下连续反应3 h,对溶液中Zn2+浓度的影响较小,除铁效果较好。     

从高炉瓦斯泥中湿法回收锌的新工艺(Ⅰ):废酸浸出及中和除铁

针对攀钢高炉瓦斯泥含锌高、不能直接返回烧结配料的问题,提出了以该厂自有的钛白废酸作浸出剂,采用低酸浸出—中和除铁—萃取—电积工艺从瓦斯泥中回收金属锌。研究了锌的浸出及浸出液除铁过程。结果表明:在废酸用量855L/t瓦斯泥、常温、液固体积质量比4︰1、反应时间2h条件下,锌平均浸出率为97.94%,铁平均浸出率在6.52%以下。对此浸出液进行中和氧化沉铁,在双氧水用量为理论用量的1.3倍、反应温度为50℃条件下,铁、砷、锑共沉淀而被除去,锌损失率在2.90%左右。     

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.     

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)     

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.