山东某低品位微细粒铁矿选矿试验

为给山东某低品位微细粒铁矿的开发利用提供合理的选矿工艺,本文针对矿石性质特点,进行磁滑轮抛尾、高压辊磨、阶段磨矿阶段磁选、反浮选等工艺试验。结果表明：采用“破碎抛废—阶段磨选(淘洗)—反浮选”流程,即-30 mm粒级原矿先在0.45 T磁场强度、2 m/s带速条件下进行磁滑轮抛尾,将所得-30 mm磁性产品再破碎至-12 mm,在0.30 T磁场强度、100 r/min转速条件下进行干式磁选;将所得-12 mm磁性产品再高压辊磨破碎至-2 mm,在0.30 T场强下进行湿式弱磁选;将所得-2 mm磁性产品细磨至-0.075 mm粒级质量分数为70%,在0.15 T磁场强度下进行湿式弱磁选;将所得-0.075 mm粒级质量分数为70%的磁性产品再磨至-0.045 mm粒级质量分数为95%,在0.14 T磁场强度下进行湿式弱磁选;最后对所得-0.045 mm粒级质量分数为95%的磁性产品进行反浮选提品位试验,最终闭路试验可获得TFe质量分数为59.14%的铁精粉,工艺Fe回收率为45.86%。     

湿式预选工艺的改造与应用

为实现采选生产能力的产量规模匹配,矿石破碎粒度降至10mm,利用湿式预选工艺将细粒级岩石提前抛尾不进入球磨选别流程,人磨品位由42.1%提高到了47.1%左右,增加了球磨机的有效处理量,年可增加铁精粉产量3.7万t,年节省磨矿成本204.3万元.     

磁铁矿湿式自磨与粗粒抛尾的工艺关系及展望

在磁铁矿传统的破碎和磨矿过程中应用粗粒磁选抛尾,是当前国内磁选工艺改革的主要途径。它不仅能够及早抛弃大量脉石与极贫连生体,大幅度节省磨矿能耗,为下一步提高铁精矿品位创造有利条件;而且将显著改善磁铁矿选矿的技术经济指标,对贫磁铁矿的开发利用开辟了广阔前景。针对磁铁矿湿式自磨过程的磨矿特性,研究其与粗粒抛尾的工艺关系,已成为近年来国内外改进自磨流程和自磨机参数,发展粗磨粗选技术的新课题,对新建和改造磁铁矿湿式自磨磁选厂都具有重要意义。本文就吉山选厂贫磁铁矿湿式自磨一段闭路流程存在的主要问题,进行了工艺现状的分析,通过多年工业试验研究,归纳了湿     

湿式预选工艺的研究与应用

破碎粒度降至10mm，利用湿式预选工艺将细粒级岩石提前抛尾不进入球磨选别流程，入磨品位由42％提高到了47％左右，提高入磨矿品位5％，增加有效处理量，从而提高铁精矿产量。     

某地高铁低锡矿探索试验

云锡某矿体储量五十万吨左右的高铁低锡矿,其含铁50%左右,主要以褐铁矿、赤铁矿的形式存在;含锡0.35%左右,主要以锡石的形式存在。对该矿种进行一定的探索试验,以寻求主要回收锡金属、综合回收铁金属的选矿工艺流程及可能达到的选矿指标。为回收该矿石中的有价元素锡、铁,分别进行了先重选锡后磁选铁、先磁选铁后重选锡两种工艺试验。结果表明,将原矿磨至-0.6mm时,经过1粗1精磁选得到磁性产品,非磁性产品经一段摇床、二段摇床选别得到粗锡精矿。结果获得含锡9.58%的锡粗精矿,锡回收率为60.57%;还可获得含铁59.00%的含铁物料,铁回收率为39.21%。总体指标较好,但需进一步提升铁回收率。试验结果可供该矿石选矿工艺的确定提供技术依据。     

量恒式干选—高压辊磨风力磁选集成工艺简述

量恒式干选机干式预选工艺与高压辊磨风力磁选工艺应用于铁矿石的生产,在破碎段实现了大规模预先干式抛尾矿,大幅提高了入磨矿品位,减少入磨矿数量,使磁铁矿细颗粒物料实现了经济、有效的干式分选富集。干选后的中矿再给入高压辊磨风力磁选集成系统,可生产3种不同品位和不同粒度的铁精矿。两种新技术的联合应用可有效地降低选矿生产成本,提升选矿生产效率,使低品位铁矿资源得到合理的和经济的开发利用。     

超细碎高效预选工艺的应用

介绍了福建省德化鑫阳矿业选矿厂超细碎高效预选工艺应用以及经济效益,采用高压辊磨机与筛分组成闭路系统后,最终破碎产品粒度从30-0mm降至3-0mm,同时通过湿式磁选预先抛尾的工艺,大大提高入磨品位,增加了原矿处理能力,减少了尾矿排放量,简化了工艺条件,获得了较明显的经济效益。     

某公司炼铜炉渣浮选尾矿回收铁的试验研究

为了从某公司铜炉渣浮选尾矿中有效回收铁,分析了浮选尾矿炉渣的性质,研究了直接磁选、高场强粗选抛尾及粗精矿再磨再选、低场强粗选抛尾及粗精矿再磨再选三种工艺。试验结果表明,通过上述三种工艺,铜炉渣中的铁可以有效回收。通过经济分析比较,推荐采用直接磁选方案,可获得铁品位49.85%、回收率13.02%的矿精铁。     

磁铁矿湿式自磨与粗粒抛尾的工艺关系及展望

在磁铁矿传统的破碎和磨矿过程中应用粗粒磁选抛尾,是当前国内磁选工艺改革的主要途径。它不仅能够及早抛弃大量脉石与极贫连生体,大幅度节省磨矿能耗,为下一步提高铁精矿品位创造有利条件;而且将显著改善磁铁矿选矿的技术经济指标,对贫磁铁矿的开发利用开辟了广阔前景。针对磁铁矿湿式自磨过程的磨矿特性,研究其与粗粒抛尾的工艺关系,己成为近年来国内外改进自磨流程和自磨机参数,发展粗磨粗选技术的新课题,对新建和改造磁铁矿湿式自     

甘肃低品位钛铁矿选矿工艺研究

甘肃某低品位原生钛铁矿TFe和TiO2的含量分别仅为12.23%和3.80%,针对铁和钛的赋存状态和嵌布粒度特点以及矿区严重缺水的现状,制定了干式中强磁磁选预抛尾、细磨弱磁选选铁、强磁选与浮选联合选钛组合技术方案,研究了磨矿细度、磁感应强度等的影响,在获得最优工艺条件的基础上,进行了全流程闭路试验。试验获得了含Fe 60.57%的铁精矿、含TiO246.15%的钛精矿,铁的回收率为35.41%,钛回收率达66.19%,实现了矿石中铁和钛资源的综合回收。     

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。     

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.     

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。     

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)