软质滤料过滤器除铁锰的试验

采用多层软质纤维过滤装置对地下水除铁、除锰 ,其性能良好 ,结果可靠 ,操作管理简单 ,节省投资 ,降低能耗 ,经济效果显著     

提高高铬铸铁衬板强韧性的研究

针对高铬耐磨铸铁脆性大,应用于承受冲击载荷的工况下不安全的情况,开始了一种通过预埋钢筋网以提高其强韧性的新工艺,已成功地应用于工业生产中。加钢筋网高铬铸铁衬板使用安全、可靠,使用寿命是高锰钢的１．６～２．０倍以上。     

煤直接液化铁催化剂的研究进展(Ⅰ)担载铁催化剂的表征及研究方向

对高分散担载铁催化剂的表征方法如ＢＥＴ,ＳＡＸＳ,ＸＲＤ,ＥＸＡＦＳ,ＥＰＭＡ,ＸＰＳ,Ｍｏｓｓｂａｕｅｒ谱等作了述评,并指出存在的问题及可能的解决方法。要了解原位担载铁催化剂的化学组成,结构和在煤上的分散状况,必须采用多种分析手段综合进行,而现有任何手段都不能定量地测得催化剂在煤上的分散度。同时指出如何表述催化剂在煤直接液化中的作用,催化剂的活性与煤本身的哪些性质相互关联是煤直接液化担载铁催化剂     

Iron recovery from zinc mine tailings by magnetic separation followed by carbothermal reduction of self‐reducing briquettes

The volume of tailings produced by the extractive industry has been increasing due to the processing of the low‐grade ore. This issue can cause environmental accidents and require significant investment to control the disposal of tailings. Therefore, this study aims to recover iron from zinc mine tailings by wet magnetic separation followed by the carbothermal reduction of self‐reducing briquettes. Two magnetic separation routes were investigated to concentrate iron. Zinc mine tailings were processed by route I, in a rougher stage followed by a scavenger stage; and route II, in a rougher stage followed by a cleaner stage. The carbothermal reductions were performed using self‐reducing briquettes composed of Fe concentrate from the route with high Fe content and charcoal. The products were analyzed by scanning electron microscopy with energy dispersive spectroscopy (SEM‐EDS), x‐ray diffraction (XRD), inductively coupled plasma optical emission spectrometry (ICP‐OES), and volumetric chemical analysis. Magnetic separation route II provided the highest‐grade Fe concentrate, 52% Fe, while route I provided 33% Fe. In the carbothermal reductions, a metallization degree of 98% in the Fe concentrate briquette, 97% in the briquette with a 10% replacement of its raw material by Fe concentrate, and 99% in the hematite briquette was reached. The replacement of raw material by Fe concentrate showed no significant change in Fe recovery. Considering the whole process, magnetic separation and carbothermal reduction, the recovery of Fe from the zinc mine tailings was 67%. Therefore, the process route suggested in this study will not only reduce tailings disposal and consequently the risk of environmental accidents, but it will also provide profitable raw material for the steel industry.     

Zn2+掺加的包覆型Fe2O3/SiO2颜料的制备及其呈色性能

包覆型Fe2 O3/SiO2颜料由于包覆完整性并不理想,该颜料高于800℃时呈色会产生变黑、变暗的问题.采用溶胶-凝胶法制备包覆型Fe2 O3/SiO2颜料,研究催化剂浓度、反应温度、硅/铁质量比等因素对包覆型Fe2 O3/SiO2颜料呈色性能的影响.在此基础上,通过掺加Zn2+,进行了Zn2+掺加的包覆型Fe2 O3...     

Al-B2O3-CeO2-粉煤灰复合增强涂层成分设计及冲蚀磨损分析

为了提高粉煤灰作为增强材料在金属基复合材料中的应用和性能,通过热力学分析和正交优化试验确定Al-B2O3-CeO2-粉煤灰复合增强涂层各成分之间可能发生的反应及最佳配方比例,采用等离子喷涂在ZG310-570基体制备了粉煤灰复合增强涂层,分析了粉煤灰复合增强涂层的表面形貌、物相和冲蚀磨损性能.结果发现,热力学分析和正交...     

盐酸酸洗废液制备α-纳米Fe2O3的工艺优化

以氧化铁皮作为除酸剂,与盐酸酸洗废液反应制得FeCl₂溶液,再采用空气-双氧水双重氧化和沉淀法从中制得α-Fe₂O₃纳米颗粒。分析了FeCl₂质量浓度、氨水质量浓度、超声时间和煅烧温度对产物的的粒径和纯度的影响。采用场发射扫描电子显微镜(SEM)和X射线衍射仪(XRD)对产物的形貌和结构进行了表征。优化实验结果表明,FeCl₂质量浓度为16 g/L,氨水质量浓度为7.5 g/L,超声时间为50 min,煅烧温度为750℃时,制得了分散性虽然一般,但纯度较高的α-Fe₂O₃,其含量高达95.3%,平均晶粒尺寸约为38.2 nm。这为盐酸酸洗废液的资源化利用提供了实验基础。     

AC8C铸造铝合金的组织缺陷分析

采用化学成分分析、断口扫描、金相检验、硬度测试等方法,对AC8C铸造铝合金内燃机活塞断裂原因进行了分析.结果表明,活塞显微组织中d-固溶体粗大、共晶硅和Al2Cu相聚集,导致合金力学性能降低,使共晶硅和Al2Cu相集中分布的区域发生早期脆性断裂.铸造和固溶时效处理工艺不当是造成铝合金组织缺陷的原因.     

一种大口径薄壁高铬铸铁管的离心铸造工艺研究

通过对一种大口径薄壁高铬铸铁管(φ700 mm×5000 mm,壁厚为20 mm)的离心铸造试制,研究了影响此种铸管生产的关键工艺参数.得出的工艺参数为:浇注温度1430～1450℃,浇注时间＜1 min,转速750r/min.     

小直径滑动轴承套卷圆模设计

对小直径滑动轴承套类制件的加工工艺进行了分析,介绍了一种小直径滑动轴承套类制件预成形模具的设计及模具的工作过程。阐述了轴承套制件卷圆前预成形加工中应注意的事项。为从事圆套类模具设计的技术人员在设计工作中提供参考。