提高焙烧炉炉床能力

1前言曲靖锌厂109 m~2焙烧炉是继西北冶炼厂、株州冶炼厂之后建成的又一大型沸腾焙烧炉,承担着曲靖锌厂10万t电锌所需焙砂的生产任务。目前,我们焙烧炉炉床能力处于一个相对较低的水平,还有很大的提升空间。今年厂部下达给我们的指标是     

沸腾焙烧炉炉墙结构的主要问题及解决措施

重点阐述109 m2沸腾焙烧炉炉墙结构在生产运行中存在的主要问题,从理论上分析论证产生问题的原因及解决措施,通过对炉墙所用材料的选择和实践应用加以充分论证,为109 m2沸腾焙烧炉炉墙结构大、中修技术改造提供了科学依据.     

余热利用技术在10万t/a电锌生产中的应用

某厂新建109 m2锌精矿流态化焙烧炉,配置了1台设计蒸发量为28 t/h的饱和蒸汽余热锅炉,投产后替代了3台燃煤蒸汽锅炉。本文介绍了余热锅炉选型、饱合蒸汽发电工艺、余热发电机组的配置特点、设计性能及运行效果。     

大型锌精矿流态化焙烧炉的技术发展

有色金属冶炼产业的规模化、集约化、智能化发展,推动了现有流态化焙烧炉技术向大型化、高效化、智能化发展.本文介绍了大型流态化焙烧炉的工艺特点及结构参数,针对早期109 m2流态化焙烧炉存在的变形、冒烟和漏风问题,后期开发的152 m2流态化焙烧炉在工艺参数和炉体结构方面进行了优化,并采用了整体浇注技术.实践证明,152 ...     

西北铅锌冶炼厂109m2焙烧炉的改进及经济性分析

介绍了西北铅锌冶炼厂新建的109m2流态化焙烧炉投产后的运行状况,并与原焙烧炉的技术经济指标进行了对比.理论计算分析及实际运行结果表明,该焙烧炉运行稳定,残硫率低,烟尘率低,焙砂质量好,经济效益和社会效益显著.     

109m~2酸化沸腾焙烧炉炉墙结构设计分析

阐述了109 m2酸化沸腾焙烧炉炉墙结构设计的合理性,介绍了施工中确保炉墙结构设计要求采取的措施。     

燃气高能脉冲除灰装置在109m~2沸腾焙烧炉余热锅炉上的应用

介绍了燃气高能脉冲除灰装置的工作原理、系统构成及特点,在109 m2沸腾焙烧炉余热锅炉上的成功应用,产生较好的经济效益。     

109m2沸腾焙烧炉环保开炉生产实践

巴彦淖尔紫金公司力创节能、环保企业,先后在焙烧制酸系统增设了离子液尾气吸收系统和活性碳尾气吸收系统,为避免锌精矿沸腾焙烧炉开炉过程中二氧化硫烟气排空造成污染,焙烧制酸二车间经过实践探索,实现了109m2沸腾焙烧炉环保开炉.     

锌冶炼沸腾焙烧炉炉顶内衬保护性维修方法的研究与应用

锌冶炼109 m2流态化沸腾焙烧炉炉顶有局部耐材剥落,炉顶的稳定性和安全性存在极大的隐患,采用局部保护性维修方法,维修后炉顶结构稳定,运行安全可靠.本次维修解决了锌冶炼焙烧炉使用过程中,破损炉顶内衬不能及时局部维修的技术难题,为锌冶炼行业提供一种锌冶炼焙烧炉炉顶内衬的维修方法,可在行业内推广应用.     

109m2焙烧炉稳定运行的生产实践

介绍了109 m2焙烧炉生产过程中存在的问题及处理方式,针对炉顶温度过高、风箱压力过高等问题,建设性地提出助燃风机辅助送风的焙烧方案.     

硫酸厂处理高浓度SO2冶炼烟气的一种创新方法

现代硫化矿火法冶炼工艺操作中,富氧技术的应用使冶炼烟气中的二氧化硫浓度很高,这是烟气处理中节省投资的先决条件。目前,对于处理高浓度二氧化硫烟气的技术状况的讨论主要是考虑不同工艺流程的技术边界条件和经济因素。奥托昆普-鲁奇公司已开发出一种更好的处理高浓度SO2烟气的全新工艺,避免了常规的用过量空气稀释的做法。新的LURECTM工艺对于新建厂和老厂扩建同样有吸引力。     

Homeostatic process and sleep spindles in patients with sleep-maintenance insomnia: effect of partial (21 h) sleep deprivation

Port Pirie is 230 km north of Adelaide, the capital of South Australia. The major industry in the city is a lead smelter owned by Pasminco. Fume, dust, and fugitive emissions from the smelter have been deposited in and around Port Pirie over the past 100 years. The results presented in this paper are from an air monitoring station situated at the southeast entrance of the smelter, approximately 600 m from the blast furnace. Measurements include total suspended particulate (TSP) and total suspended particulate lead (TSPL) reported as concentrations (microgram/m3). Data are available from 1986 to 1996 and consist of 548 measurements. Analysis of geometric mean concentration levels by wind direction showed that while for TSP there was little relationship with wind direction, TSPL increased substantially as the wind came from the direction of the smelter. An analysis of geometric mean concentration levels by wind speed showed that TSP was significantly correlated with wind speed for all wind sectors apart from winds coming from the smelter production area. The lack of correlation between TSP and wind speed when the wind blows from the direction of the smelter is probably due to the dilution effect of particulate from a point source as wind speed increases. TSPL was significantly correlated with wind speed for all wind sectors apart from winds coming from the city. As expected, both TSP and TSPL concentrations were significantly lower on days when rain fell. Both mean geometric TSP and TSPL concentrations were lower in the period 1993-1996 than in 1986-1992. Multiple linear regression analysis was used to demonstrate that this decline was statistically significant after adjusting for weather conditions. Wind directions were divided into four sectors: winds from the smelter production area; winds from the smelter nonproduction area; winds from the zinc wharf and east of the city; and winds from the city. Structural equation models for each sector were used to demonstrate that the decline in geometric mean TSPL concentrations over the two periods were of a similar order of magnitude for all four sectors. The relevance of this to the lead abatement programs that have been undertaken both within the city of Port Pirie and inside the smelter itself is discussed.     

次氧化锌粉吸收低浓度SO_2试验

以某锌冶炼企业所收集的次氧化锌粉制备的浆料吸收低浓度二氧化硫烟气。结果表明,在常温、次氧化锌浆料浓度15%、浆料pH4.5、烟气流量750m3/h的条件下,吸收模拟的含二氧化硫2 130mg/m3的烟气,二氧化硫吸收率能达到99.6%,吸收后的尾气二氧化硫可达到相关排放标准,并且二氧化硫和锌可循环利用。     

提高烟化炉处理铅锌冶炼渣能力的实践

某铅锌冶炼厂通过烟化炉处理铅锌冶炼渣回收有价金属,由于烟化炉采用的钢制冷却水套使用寿命短,导致作业率偏低。同时,由于烟化炉冶炼渣的SiO₂含量高,烟化炉经常出现炉渣流动性恶化而影响作业率。随着该冶炼厂渣物料产量的增加,烟化炉能力不足的问题逐渐凸显,急需提升作业率和炉床能力。通过系统研究,对烟化炉的工艺和设备进行优化改造,烟化炉的实际作业率从改造前的85.01%提高到96.48%,床能力提高3.9 t/(m²·d),达到21～22 t/(m²·d)。     

Unit risk estimates for airborne arsenic exposure: an updated view based on recent data from two copper smelter cohorts

The current unit risk for airborne arsenic, 4.29 x 10(-3), was established by the EPA in 1984. Using updated results from a cohort mortality study on Tacoma smelter workers and recent findings from a cohort study of 3619 Swedish smelter workers, new unit risk estimates were developed for the respective cohorts. Methods were analogous to those used by the EPA in 1984, and all estimates were derived under an absolute risk model. A new unit risk 1.28 x 10(-3), was estimated for the Tacoma smelter cohort which was a factor of 5 less than the EPA's earlier estimate, and a direct result of radically revised exposure estimates. A unit risk of 0.89 x 10(-3) was estimated from the Swedish study. Pooling these new unit risk estimates with the EPA's earlier estimates from the Montana smelter cohort yielded a composite unit risk of 1.43 x 10(-3). Based on this estimate, the present unit risk may overestimate the effects of airborne arsenic by a factor of 3. A need to update the unit risk for airborne arsenic and the collateral IRIS database is evident from the results.     

A retrograde fluorescent-labeling study of direct relationship between the limbic (anterodorsal and anteroventral thalamic nuclei) and the visual system in the albino rat

Case-control methodology was used to assess lung cancer risk from exposure to arsenic in air, employing data from former workers in different units at the Chuquicamata copper mine and smelter complex. Thirty two workers from this complex were identified among the lung cancer deaths that occurred in the Northern region of Chile between 1987 and 1991. Each case was matched on age and sex, with controls that had a similar date of enrolment in the company. Available data on arsenic concentrations in air for six work sites were compiled from 1952 to 1991 and these were used to categorize the workplaces: Administrative area (1.6 micrograms/m3), Mine (2.3 micrograms/m3), Oxid Plant (3.1 micrograms/m3), Workshop and Services (9.8 micrograms/m3), Sulphur Plant (8.4 micrograms/m3) and Smelter (201.7 micrograms/m3). The results indicate an Odds Ratio of 5.7 (Fisher's p = 0.016) of dying from lung cancer among workers of the smelter compared with the rest of the workers.     

Lu 25-109, a combined m1 agonist and m2 antagonist, modulates regulated processing of the amyloid precursor protein of Alzheimer's disease

To examine the effects of the combined muscarinic ml-agonist/m2-antagonist Lu 25-109 on regulated processing of the amyloid protein precursor (APP), we used both transfected cells expressing human muscarinic m1 or m2 acetylcholine receptors, and fresh rat hippocampal slices. Lu 25-109 readily stimulated APPs secretion from HEK 293 cells overexpressing m1, but not m2, receptors, as well as from the hippocampal brain slices. Time-course analyses revealed a rapid (5-35 minutes), and a delayed (55-75 minutes) secretory response to Lu 25-109 with distinct concentration profiles suggesting two distinct cell biological mechanisms. Both responses appeared to reflect post-translational mechanisms because levels of APP message were unchanged after 60 minutes of stimulation with Lu 25-109. In comparison to carbachol, Lu 25-109 had a significantly lower intrinsic activity at muscarinic m1 receptors, compatible with a pharmacological profile as a partial agonist at recombinantly expressed m1 receptors. In as much as stimulation of APPs secretion is associated with reduced formation of A beta peptides, Lu 25-109 may be useful to reduce A beta generation, and thus, slow amyloid plaque formation. Moreover, Lu 25-109 may be useful in promoting the known neurotrophic and neuroprotective biological functions of secreted APPs.     

采用三菱连续工艺的新建铜厂

介绍采用三菱连续熔炼和吹炼工艺的新建铜厂——温山冶炼厂、格雷西克冶炼厂和肯布拉港冶炼厂的情况。     

袋除尘器在密闭鼓风炉炼镍系统中的应用探讨

通过对袋除尘器在某冶炼厂4．2m^2密闭鼓风炉镍冶金系统中的应用情况进行总结。对严重影响袋除尘器的寿命的原因进行分析,通过有效的方法使滤袋腐蚀、破损情况得以改善,使滤袋的寿命得以提高。