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1.
含砷铁矿石脱砷研究现状   总被引:2,自引:0,他引:2  
进行含砷铁矿石脱砷研究对于有效开发利用我国贫矿、复合矿资源,降低钢材中砷质量分数有着重要意义。介绍了我国含砷铁矿资源的特点,综述了气化脱砷反应机理,铁矿石脱砷工艺以及温度、气氛、时间等因素对脱砷率的影响,展望了含砷铁矿石脱砷今后的研究方向及发展趋势。  相似文献   

2.
介绍了钴冶炼厂在火法处理高砷钴矿过程中,含砷烟气、含砷废水、含砷废渣的污染和治理情况。  相似文献   

3.
含砷烟灰脱砷现状   总被引:4,自引:0,他引:4  
介绍了有色工业中含砷烟灰的主要来源及形态,综述了脱砷的两类方法——焙烧脱砷和浸出脱砷的研究现状,对比了两类方法的优缺点,得出浸出脱砷有工作环境好、适用范围广、能耗较低和技术手段丰富等优点,可实现含砷烟灰的变废为宝和综合利用。并指出含砷烟灰安全处置及综合利用的意义,以期对含砷废料的综合利用研究有所帮助。  相似文献   

4.
有色冶金工业含砷物料的处理及利用现状   总被引:10,自引:0,他引:10  
综述了当前有色冶金工业中产生的AsH3气体、含砷烟尘、含砷废水及含砷废渣的处理方法及综合利用现状,并指出当前砷产品的开发、应用及发展前景,为以后含砷物料的处理指明了方向。  相似文献   

5.
以含砷铁液为研究对象,采用还原脱砷的思路,在实验室条件下系统研究了不同脱砷剂对铁(钢)水脱砷效果的影响。结果发现,低温有利于脱砷反应的进行;不同的脱砷剂对含砷铁水有不同的脱砷效果,但是选用的自制添加剂脱砷效果最好,脱砷率最高可达到58.6%,而其它脱砷剂最高不超过25%。研究还发现,铁水中的磷含对脱砷率有较大的影响,随着铁水中磷含量的降低,脱砷率明显提高。  相似文献   

6.
介绍有色冶金中砷的主要走向及含量分布情况,综述了现阶段国内对含砷物料进行综合处理的四类主要方法——火法焙烧脱砷、湿法浸出脱砷、火法与湿法联合脱砷以及生物氧化预处理脱砷的研究现状,对比分析了四类主要方法的优缺点。湿法脱砷和生物氧化预处理脱砷相对于其他方法具有工艺简单、操作条件温和、节能环保等优点,在实际生产中得到了一定的应用。最后,指出了有色冶金中含砷物料脱砷研究的发展方向。  相似文献   

7.
针对甘肃某金精矿含砷(12.44%)高的特点,进行了金、砷分离选矿试验研究。通过试验探索,确定采用抑硫浮砷工艺流程,即金精矿细磨后采用石灰为抑制剂、硫酸铜为活化剂进行浮选毒砂抑制黄铁矿。其结果表明:抑硫浮砷工艺流程较好地解决了金精矿含砷高的问题,且浮选闭路试验获得了较好的分离效果,金精矿金品位33.65 g/t、含砷1.19%,金作业回收率91.48%。  相似文献   

8.
介绍了砷资源的供需情况及有色冶炼含砷物料的走向及含量分布情况。综述了含砷危废无害化处置技术及工业应用情况,详细介绍了国内外含砷危废玻璃固化技术研究现状,指出玻璃固化技术是含砷危废处理的最佳技术,并从政策管理、标准制定、技术研发及污染治理等角度指明了砷玻璃固化技术的发展方向。  相似文献   

9.
随着国家环保政策的日益严格,环境保护显得愈发重要。冶金化工行业产生的含砷废物及含砷废渣等对环境的影响没有得到有效解决,治理砷害成为公众关注的焦点之一,同时,从含砷废物中提炼砷产品符合经济社会发展的需要。本文简要介绍了传统炼砷工艺,并结合贵溪冶炼厂实践,对国内先进的加压浸出炼砷工艺进行了系统的介绍,为同行业处理含砷废物提供参考。  相似文献   

10.
从含砷金硫铁矿中综合回收砷硫   总被引:1,自引:0,他引:1  
本文介绍了含砷金硫铁矿资源概况,砷在焙烧过程中的行为与分布,着重阐述了含砷金硫铁矿的各种处理工艺以及从冶炼烟气中综合回收砷、硫采用的有效设备。  相似文献   

11.
固体含砷废料的稳定性及处理方法   总被引:9,自引:0,他引:9  
由于砷及其化合物为剧毒物质,固体含砷废料的稳定性及处理方法对环境保护至关重要。本文介绍了固体含砷废料稳定性的测定技术,综述了三氧化二砷、砷酸钙、硫化砷、含砷水铁矿和臭葱石等各种固体含砷沉淀物的稳定性及处理方法的研究成果。  相似文献   

12.
The problem of the recycling of plastic wastes is discussed. The polypropylene needs of the modern Russian market are analyzed. The necessity of recycling of plastic wastes is revealed, and its advantages over reclamation are substantiated. The problems of a real enterprise regarding the recycling of polypropylene—polyethylene raw materials for increasing the properties of the end product and optimizing its production are considered, and methods for their solution are proposed.  相似文献   

13.
This paper presents an overview of alternatives that currently are employed for the disposal of wastes containing enhanced concentrations of naturally occurring radioactive materials (NORM). The application of pathway assessment methodology to the derivation of acceptable cleanup criteria for residual NORM is described. A specific example is provided drawing on experience with a site containing above-background levels of natural uranium-series and thorium-series nuclides. The options for safe, permanent disposal of U and Th bearing NORM waste are discussed and the application of pathway analysis to performance assessment of a typical engineered disposal cell is illustrated. Typical methods for disposal of other NORM waste forms also are described. This includes radium-contaminated wastes from petroleum sludges, uranium milling, and geothermal power plant operation as well as thorium wastes from production of thorium-magnesium alloys.  相似文献   

14.
铅冶炼中的三废治理及环境保护   总被引:1,自引:0,他引:1  
综述了铅冶炼厂的生产简况,主要三废的来源、类别、治理方法及其效果,生产中铅毒的防护及环境保护.针对三废治理存在的问题,提出了建议措施.  相似文献   

15.
Great amounts of agroindustrial wastes rich in polysaccharides, such as pectic substances, are produced worldwide. Some of these wastes are used for the production of pectin. Currently, pectin is extracted at industrial scale by physicochemical means, but lately new biotechnological alternatives have been developed. In this review, the principal characteristics of pectic substances and pectic enzymes are described. The traditional physicochemical method for the pectin extraction is described and the new biotechnological (microbial and enzymatic) methods for pectin extraction are discussed and commented as well.  相似文献   

16.
冯琦  王强  彭锋 《中国冶金》2018,28(6):71-74
不锈钢生产会产生大量的不锈钢除尘灰和酸洗污泥等含镍、铬固体废弃物,如若处理不当,不仅会导致大量镍、铬等资源的浪费,而且会造成严重的环境污染。目前,含镍、铬不锈钢尘泥资源化利用途径虽然较多,但无论是回收其中有价金属元素,还是生产水泥、陶粒、化工颜料和肥料等资源化利用,都存在一定的局限性。因此,展望未来不锈钢尘泥的资源化利用应以直接返生产工序循环利用为重点研究和发展方向。  相似文献   

17.
稀土元素在工业上大量应用的同时, 给人类身体健康和生态环境带来了危害, 近年来引起了广泛关注.研究发现吸附法相比其他传统水处理方法具有效果较好、操作简单、成本较低等优点, 它是消除稀土离子危害的最具潜力的方法之一; 而农业废弃物吸附剂因是农业副产物具有廉价的特性, 且部分农业废弃物吸附稀土离子时吸附量大、反应速率快, 可作为主要研究对象.文中对农业废弃物吸附材料吸附稀土离子的机理、吸附影响因素、吸附应用与吸附模型研究进展进行总结评述, 并对农业废弃物吸附稀土离子的发展方向进行展望.   相似文献   

18.
Debridement of nonviable tissue is crucial to optimal wound healing, which can be impaired unless all necrotic tissue, exudate, and metabolic wastes have been removed from the wound. Debridement methods are classified as sharp, mechanical, chemical, and autolytic. This article describes methods of debridement and their outcomes.  相似文献   

19.
Summary After filing operations, wastes are obtained at ball-bearing plants in the form of partially oxidized steel powder, which can be used for manufacturing parts by powder metallurgy methods. The modes of reduction of the steel powder and its basic properties are discussed.  相似文献   

20.
In accordance with the national energy strategy, the development of coal-fired power stations in Russia, especially in Siberia and the Far East, calls for utilization of their ash and slag wastes. The total quantity of ash and slag in Russian tailings exceeds 1.5 billion t. These wastes cover an area of more than 220 km2. The utilization of these wastes is no more than 10%. The most promising approaches are utilization of the wastes in construction materials or road building, or a hybrid approach in which valuable metals are extracted during the production of construction materials. Some fly ash can be used in agriculture. The physicochemical properties of ash and slag waste and correspondingly their applicability and the choice of technology will be determined by the mineral component of the coal and the methods by which the coal is burned. In order to use fly ash in construction, dry processing methods for ash and slag waste must be introduced. On the one hand, that involves greater capital expenditures on equipment and structures for storage, classification, crushing, and grinding of the ash and slag waste, as well as means of modifying their properties. On the other, increased transportation and organizational barriers must be expected. Examples of proposed processing technologies based on metal extraction and the production of construction materials are presented. To obtain iron-bearing concentrates, single-stage magnetic separation is mainly employed. However, the resulting quality of the concentrate is unsatisfactory. A better approach to the extraction of metals from ash and slag waste is flotation. At the same time, the available data indicate that the application of flotation may be limited by economic and organizational factors and associated environmental hazards. The conclusion is that the use of such technologies at thermal power stations that are already in operation is possible, with state support.  相似文献   

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