柴油机铸造工艺环境污染物的分析

采用Gc／ITD(色谱／离子阱)对铸造车间周围的大气、气溶胶粒子以及制模砂芯浸出物中有机组分作了定性、定量分析,并采用串列式净化装置对烘模窑烟气进行了治理,测试结果表明,治理效果良好。      

铸造行业废气治理研究

随着工业及制造业的高速发展,铸造业也发展迅速,而射芯机在铸造业应用广泛,随之产生大量工业废气,不仅污染了环境,同时也对人体的身心健康造成不良影响,采取行之有效的技术处理射芯机废气,是铸造行业的重要研究课题。介绍了射芯机的工作原理、废气产生来源及治理现状,并对射芯机废气的治理进行展望。     

某小型铸造车间除尘系统设计

针对小型铸造车间中污染源的产生设备多种、污染物性质多样以及整个车间中工艺操作无固定工作制等特点,介绍了除尘系统的设计,包括各生产设备上除尘罩、工艺管道及设备选型等,最后提出了可进一步改进的意见.     

铸造烟尘治理技术

结合铸造工艺过程,分析介绍了铸造烟尘的来源及其危害,介绍了铸造粉尘的除尘技术,重点介绍了袋式除尘新设备的特点以及国外电弧炉烟尘的治理新技术.     

Evaluation of soil microbial toxicity of waste foundry sand for soil-related reuse

The relationship between the chemical con- taminants and soil microbial toxicity of waste foundry sand （WFS） was investigated. Five different types of WFS from typical ferrous, aluminum, and steel foundries in China were examined for total metals, leachable metals, and organic contaminants. The soil microbial toxicity of each WFS was evaluated by measuring the dehydrogenase activity （DHA） of a blended soil and WFS mixture and then comparing it to that of unblended soil. The results show that the five WFSs had very different compositions of metal and organic contaminants and thus exhibited very different levels of soil microbial inhibition when blended with soil. For a given WFS blended with soil in the range of 10wt.%-50wt.% WFS, the DHA decreased almost linearly with increased blending ratio. Furthermore, for a given blending ratio, the WFSs with higher concentrations of metal and organic contaminants exhibited greater microbial toxicity. Correlation analysis shows that the relationship between ecotoxicity and metal and organic contaminants of WFSs can be described by an empirical logarithmic linear model. This model may be used to control WFS blending ratios in soil-related applications based on chemical analysis results to prevent significant inhibition of soil microbial activity.     

汽车铝合金轮毂的成形工艺

介绍了汽车铝合金轮毂几种主要成形工艺的特点和应用概况,指出随着汽车工业对高质量铝轮毂的需求日益增加,传统的成形工艺正得到不断改进,挤压铸造和半固态模锻等一些新的金属成形工艺也将在汽车铝轮毂生产中得到应用.     

硫酸浸出处理铜锌废渣生产氧化锌

本文用硫酸浸出一种置－净化分离回收铜锌废渣中的铜锌，产出海绵铜和氧化锌，铜，锌的浸出率分别达到９８．５０％和９９．５０％铜，锌的回收率均达９７％以上，工艺条件较易控制，产品海绵铜品位大于７５％，氧化锌达到二级标准。     

过共晶铝硅合金半固态挤压铸造近终成形技术研究

研究了AI-Si(质量分数为24.3％和AI-Si(质量分数为29.2％)合金在机械搅拌作用下初晶硅形貌变化的工艺参数，半固态料坯的制备方法和半固态挤压成形的工艺方法。实验结果表明605℃是该成分范围的过共晶铝硅合金合适的半固态搅拌温度，在该温度下恒温搅拌50min可有效地改变板条状初晶硅的形态，获得平均直径为200μm的球状化的初晶硅；在上述优化的半固态工艺条件下采用挤压铸造工艺获得了优质的近终成形圆盘形零件。     

连铸机循环冷却水水质稳定处理分析

连铸机循环冷却水水质稳定处理分析李春和赵翠荣（承德钢铁公司炼钢厂，河北０６７００２）缓蚀阻垢是连铸机循环冷却水水质稳定处理的根本内容。由于各种天然水都具有结垢和腐蚀的特性，而循环水在不断循环使用过程中，因水温升高、蒸发、浓缩，增加了其矿物质浓度；水与...