Treatment of wood ash containing soluble chromate

The “TA Siedlungsabfall” issued in Germany in May 1993 will entail severe problems concerning the disposal of wood ash. One particular problem is associated with the occurrence of soluble chromium compounds in the leachates of wood ash. During combustion of wood, wood residues or waste wood, Cr-III which is generally found in wood is partly oxidized to Cr-VI. Under the conditions of the leaching test DIN 38 414 part 4, which is the compulsory test procedure according to the “TA Siedlungsabfall”, Cr-VI is partly soluble. Thus, the comparatively low limit value for the leachates is exceeded by many wood ash samples. To achieve significant reduction of the soluble Cr-VI content of wood ash, a procedure termed wet ash removal was applied. Investigations were carried out both under industrial conditions and in the laboratory. It is shown that wood ash leachates with Cr-VI concentrations of up to about 2 mg/l can be treated effectively with this procedure.     

胶接接头设计及检验方法

介绍了胶接接头的设计原则，对胶接前零件的表面及涂胶处理作了说明，同时介绍了初步的胶接工艺流程与检验方法．扼要对胶接技术与传统的连接方式进行了比较。     

冷轧双金属带材连续平整除油印花机组的研制

介绍国内双金属薄带第一条连续平整、除油、印花机组的设计思想、工艺吸设备特性变差所致，并介绍了调试过程中遇到的难点和解决方法。．     

核设施退役中几个值得重视的问题

本文阐述了核设施退役中一些重视的问题，包括：退役的级别问题；退役必须有周密的计划；搞好源项调查；优选去污工艺；采用安全可靠的切割解体技术，必须高度重视废物最少化；高度重视安全问题；重视人员培训和安全文化素养的提高；安排好废物的最终出路；相关标准和导则的编制。     

飞秒激光在含能材料加工中的应用

简要介绍了飞秒激光发展过程及其特点,讨论了利用飞秒激光的超快速时间和超高峰值的特性在不同领域的应用;对利用飞秒激光加工与处理炸药、发射药等含能材料的过程和原理进行了介绍与分析,飞秒激光在处理过程中基本上不会发生热量的传递过程与化学反应.     

Reuse and Reproduction of Used Refractories

1 Introduction About9 millions tonnes of refractories are consumed in China annually owing to the rapid development of the metallurgical industry, from which more than 4 million tonnes of used refractories are inevitably generated. Most of used refractori…     

Optimization of municipal solid waste (MSW) disposal in Saudi Arabia

Municipal solid waste (MSW) mainly comprises organics, paper, glass, plastics, metals, wood, etc. Rapid industrialization, high population growth rate, and fast urbanization have resulted in increased levels of pollution and MSW in Saudi Arabia. The amount of waste has been steadily increasing due to increasing human population and urbanization. Recovery refers to materials removed from the waste stream for the purpose of recycling and/or composting. There are various options available to convert solid waste to energy. Mainly, the following types of technologies are available: (1) sanitary landfill, (2) incineration, (3) pyrolysis, (4) gasification, and (5) anaerobic digestion. An integrated MSW disposal policy comprises (1) reduction of MSW source, (2) reuse of MSW, (3) recycling of MSW, (4) landfill and gas-to-energy conversion, and (5) MSW-to-energy conversion. Traditionally, MSWs have been disposed in landfills. Landfill is the most inexpensive waste disposal option. The main MSW disposal policies and barriers have been concluded in this study.     

多绞屏蔽线处理及焊接工艺

介绍了屏蔽线的分类及结构组成;分别以线束中含有少量屏蔽线和多股屏蔽线为例,通过分步说明和图例示范,阐述了两大类情况下,各种屏蔽线的处理方法;并对各种处理方法的应用场合和实际特点给予了重点说明;最后,结合实际工作经验,对多绞屏蔽线处理过程中的常见问题及注意事项进行了归纳和总结.     

长庆油田银川基地饱和液化软土地基强夯处理技术

该文介绍了长庆油田银川基地采用强夯法技术处理饱和液化软土地基的试验情况、成功经验及技术，取得了较好的社会经济效益，可供地质情况相似的场地借鉴。     

确定管理豁免值的技术原理和方法——以低放废物的陆地处置为范例

在我国第一代核设施已陆续进入退役阶段的今天,正确制定各种管理豁免值具有很大的技术、经济意义。本文以低放废物的陆地处置为例,比较详细地介绍了从技术上确定豁免值的原理和方法。在对有关问题的讨论中,着重强调了结合各种实践和场址的具体特征进行优化分析的重要性。