新疆某低品位钒钛磁铁矿选矿试验研究

新疆某低品位钒钛磁铁矿全铁含量为13.74%,通过对其进行工艺矿物学及可选性试验,确定了处理该矿石合理的选别工艺流程,即预选抛尾-两段阶磨阶选工艺,取得了精矿TFe品位59.36%的较好试验指标,为高效开发利用该低品位钒钛磁铁矿提供了技术依托。     

以持续提高资源利用效率为核心的循环经济实践

一、背景(一)攀枝花钒钛磁铁矿性质复杂,含铁品位低,选别难度大,铁钛难以分离,成为产业化利用的巨大难题攀钢所处的攀西(攀枝花-西昌)地区是中国乃至世界矿产资源最富集的地区之一,蕴藏着以钒钛磁铁矿为主的矿产资源高达100亿吨。然而,由于攀西地区的钒钛磁铁矿属多金属共生矿,含铁品位较低(只有27%-33%),且钒钛磁铁矿中铁、钛致密共生,钒则以类质同象赋存于钛磁铁矿中,磁铁矿中的钛铁晶石粒度极细并以网格状镶嵌,用机械选矿方法难以实现铁钛分离和钒的回收,冶炼过程中铁钒难以分离,钒和钛难以提炼,高钛型钒钛磁铁矿在国内外均没有现成钒、…     

承钢成功攻克钒钛磁铁矿大高炉冶炼不稳定的世界难题

<正>承钢公司4号2500m3高炉是世界容积最大的冶炼钒钛磁铁矿高炉。承钢公司作为我国钒钛磁铁矿高炉冶炼技术的发祥地,依靠创新驱动,致力于推动国内钒钛冶炼技术升级。至2015年5月,承钢公司4号高炉已连续稳定顺行28个月,Si+Ti合格率和一级品率均保持100%,吨铁成本达到国内同类型高炉领先水平。钒钛磁铁矿是一种冶炼难度很大的矿种,存在着入炉品位低、渣量大、渣铁粘度大、出渣出铁困难等问题,大高炉钒钛磁铁矿冶炼不稳定是国内乃至世界的技术难题。承钢公司大力推进科技创新工作,加强科技人才队伍建设,新技术     

陕西某矿区低品位钒钛磁铁矿选矿试验研究

陕西某矿区钒钛磁铁矿为低品位钒钛磁铁矿,钒钛磁铁矿共生有铁、钛、钒三种主要元素及其他有价金属,为减少资源浪费,更好地实现钒钛磁铁矿资源综合利用,提高选矿金属回收率。根据矿石性质特点,选用预先抛尾、两段磨选“阶磨阶选”的选矿工艺流程对该矿石进行选矿试验的相关研究,为指导生产、优化选矿工艺参数提供依据。     

攀钢极低品位钛铁矿得到有效利用

正攀钢矿业公司设计研究院科技人员历经8年不懈攻关,"低品位橄辉岩型钛铁矿选钛工艺及装备产业化集成技术研究"圆满结题。应用该项目成果的白马选矿尾矿选钛生产线,于2018年实现了年度达产达效。白马矿区是攀西钒钛磁铁矿四大矿区之一,矿藏丰富。白马选钛生产线是对白马选矿选铁尾矿进行再次选别处理,其含钛品位极低,平均品位仅为3.7%,远低于原生钒钛磁铁矿8%至10%的品位。同时,需要克     

国内外新闻

攀钢钒钛矿高效分离课题通过国家科技部验收由攀钢牵头承担的"十一五"国家科技支撑计划课题---"攀枝花钒钛磁铁矿高效分离与资源综合利用技术开发"课题,2月27日在北京顺利通过国家科技部验收。该课题由中国有色金属工业协会组织,攀钢牵头,北京科技大学、北京大学参加。通过实验研究、工业试验和装备研发,攀钢建成了具有完全自主知识产权的"攀钢100 kt/a钒钛资源综合利用新工艺中试线",解决了钒钛磁铁矿直接还原温度高、易粘接、转底炉布料出料不均匀及出料设备寿命短、热金属化球团氧化粘结料罐、冶炼钒钛金属化球团时钒还原率低及渣铁难分离、高镁铝低品位含钛炉渣提钛等诸多技术难题,铁、钒、钛从精矿至半钢、片     

陕西某低品位钒钛磁铁矿资源综合利用新工艺研究

陕西某钒钛磁铁矿资源,TFe品位为15．85％,TiO2品位2．94％、V2O5品位0．14％,属尚难利用低品位钒钛资源。通过采用新型ZCLA选矿机进行粗粒湿式抛尾,再采用弱磁选回收钒钛磁铁矿,强磁选一重选工艺回收钛铁矿,最终实现该矿铁、钛、钒资源的综合利用,钒钛磁铁矿产率13．37％,品位可达到60．18％～65．27％,磁性铁回收率达到98％以上,钛铁矿产率1．94％,钛铁矿回收率84．09％以上,铁精矿含V2O5富集到0．89％～0．93％,改变了矿山只能回收铁资源的现状,开创了钒钛铁资源综合回收的新工艺。     

攀钢钒高钛型钒钛磁铁矿烧结技术进步

攀枝花钒钛磁铁矿矿物组成复杂,其精矿产品含铁品位低、TiO2含量高,采用阶磨阶选工艺可使精矿品位达到54%,但TiO2仍高达13%左右;该精矿具有"低铁、低硅、高钛、高铝、高亚铁、高硫"的特点,同时精矿粒度粗,制粒性能差,影响烧结透气性;该精矿初始熔点高,生成液相量少,烧结矿矿物组成复杂,严重影响强度与冶金性能。近十多年来,通过采取使用生石灰,提高烧结矿碱度,燃料分加,配加普通矿粉,烧结机技术升级,采取高负压大风量烧结等一系列强化技术,烧结取得了重大技术突破,利用系数达到1.4 t/(m2.h)以上,转鼓指数达到73%以上,改变了钒钛精矿烧结多年的落后状况,满足了高炉精料要求,高钛型钒钛磁铁矿烧结技术处于世界先进水平。     

印尼海滨砂矿与攀西钒钛磁铁矿选铁差异性研究

以攀西某钒钛磁铁矿干抛尾矿作对比样,开展印尼海滨砂矿和攀西钒钛磁铁矿的选铁试验研究。结果表明：获得TFe品位相当铁精矿时,印尼海滨砂矿选铁工艺流程较攀西钒钛磁铁矿简单,估算印尼铁精矿选矿成本较攀西铁精矿的低约80元/t,印尼铁精矿S含量0.042%,能降低冶炼脱硫成本;印尼海滨砂矿选铁尾矿中钛无利用价值,印尼铁精矿Cl含量0.012%,需特别关注其对高炉的腐蚀。研究成果为今后印尼海滨砂矿资源的利用提供数据支撑和技术支持。     

行业信息

国土资源部公告攀西钒钛磁铁矿"三率"标准(试行)为强化钒钛磁铁矿资源合理开发利用的监督管理,促进矿山企业节约与综合利用钒钛磁铁矿资源,国土资源部近日公布了《四川攀西钒钛磁铁矿资源合理开发利用"三率"指标要求(试行)》。     

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)     

Comparison of rates of infection of two methods of emergency ventricular drainage

The rates of infection of two methods of external ventricular drainage in use at Atkinson Morley's Hospital--namely, (a) percutaneous drainage with Rickham reservoirs and (b) tunnelled ventriculostomies--were compared in this retrospective review. Percutaneous drainage of CSF with Rickham reservoirs was associated with a 27% rate of infection as identified by positive microbiological cultures; tunnelled ventriculostomy catheters had a 10% infection rate. The difference in the infection rate between the two methods was statistically significant (P < 0.015). Other variables examined, including the age and sex of the patients and the reasons for ventricular drainage, were not associated with an increased rate of infection. Most infections from either method were caused by a coagulase negative staphylococcus. The average duration of ventricular drainage before identification of positive cultures was 5.7 days for Rickham reservoirs and 6.0 days for ventriculostomies.     

浅析《野草》的版画特征

鲁迅先生一生热爱美术作品,对版画中木刻兴趣尤甚.<野草>作为其"写心之作",亦呈现出一些与木刻版画一致的审美特征:一是具有木刻版画的色彩特征,多对比、多冷色,有阴郁的美感;二是具有木刻版画的力度特征,环境描写、人物刻画处处刀锋毕现,遒劲有力,有一种"力之美".     

四辊破碎机车刀架的改造

针对四辊破碎机车刀架车削中存在的几个问题,详细介绍了电动车刀架的结构和工作原理,建立主要设计参数的数学表达式,并进行适当的分析。改造后,这种电动车刀架运行平稳、可靠、方便、省力,取得了预期的效果。     

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.