دانلود رایگان مقاله لاتین بکفیل خمیری سیمان از سایت الزویر
عنوان فارسی مقاله:
وابستگی دمایی به واکنش پذیری بکفیل خمیری سیمانی
عنوان انگلیسی مقاله:
Temperature dependence of the reactivity of cemented paste backfill
سال انتشار : 2016
برای دانلود رایگان مقاله بکفیل خمیری سیمان اینجا کلیک نمایید.
مقدمه انگلیسی مقاله:
1. Introduction
Historically, mining has been imperative to human and social development, and the industry will continue to make investments that meet the increasing needs of society (ICMM, 2012). Yet the mining industry generates a substantial volume of solid wastes as by-products (Lottermoser, 2010), which mainly consist of rock wastes and tailings, that can have environmentally, socially and economically long lasting and detrimental consequences (Kitula, 2006). Tailings are considered to be the largest waste by-product (Dold, 2014), and sulphide bearing tailings in particular are considered to be a serious environmental issue that the mining industry is facing worldwide (Ohlander et al., 2012 € ). Generally, tailings are a slurry of grounded rock and process effluents generated by mine processing plants and usually deposited into impoundments (Davies and Rice, 2001). These conventional methods of tailings storage and disposal have several environmental, geotechnical (e.g., failure of tailings dams) and economic issues for the mining industry (Dold, 2014). The management of sulphidic mine tailings is one of the greatest challenges for the mining industry worldwide (Ohlander et al., 2012 € ) because they cause acid mine drainage (AMD) which is produced as a result of the oxidation of sulphide minerals (e.g., pyrite) found in tailings (Kumari et al., 2010). This drainage can have long-term adverse effects on the environment (Johnson and Hallberg, 2005). Therefore, the storage or disposal of tailings, in particular sulphidic mine tailings, on the surface of the ground, either in impoundments or dams, incurs the most substantial environmental liability throughout the operating and decommissioning stages of mines (Martin and Davies, 2000). The risks and consequences associated with conventional tailings impoundments, substantial operation and maintenance costs of these impoundments as well as public perception and more strict regulations on the disposal of such waste have driven the mining industry to search for alternative methods that can prevent and/or minimize the effects (Alakangas et al., 2013; Fall et al., 2009). As a result, a number of alternative techniques for the disposal or management of tailings have been developed in the recent past, such as the use of sub-aqueous techniques, application of high density thickeners, filter pressing of tailings and then stacking them (dry stacking) or mixing the tailings with cement and then pumped underground (cementedpaste backfill (CBP)). Among these alternative techniques, cemented paste backfilling has been the most novel and promising technology for the management of mine tailings, including sulphide bearing tailings. Therefore, this technology has now become a commonly used method and extensively practiced in the mining industry worldwide. The implementation of cemented paste backfilling has several advantages, such as minimizing the amount of storage tailings on the surface of mine site, increasing mining production, controlling the oxidation of sulphides and mobilisation of metals (Alakangas et al., 2013; Yilmaz et al., 2004; Hassani et al., 2001; Hassani and Archibald, 1998).
برای دانلود رایگان مقاله بکفیل خمیری سیمان اینجا کلیک نمایید.
کلمات کلیدی:
Strong Temperature Dependence in the Reactivity of H2 on RuO2(110 ... pubs.acs.org/doi/abs/10.1021/acs.jpclett.6b01307 by MA Henderson - 2016 - Cited by 1 - Related articles Jul 19, 2016 - Understanding the reactivity of H2 is of critical importance in controlling and optimizing many heterogeneous catalytic processes, particularly in ... Advances in Cement Technology: Critical Reviews and Case Studies on ... https://books.google.com/books?isbn=1483190382 S. N. Ghosh - 2014 - Technology & Engineering As found in Portland cement it contains small quantities of iron, magnesium, ... Other work [13, 14 J suggests that the reactivity is dependent on the type and ... Reactivity of Fe(II)/cement systems in dechlorinating chlorinated ... https://www.ncbi.nlm.nih.gov/pubmed/15721534 by I Hwang - 2005 - Cited by 29 - Related articles Reactivity of Fe(II)/cement systems in dechlorinating chlorinated ethylenes. ... to which the reaction rate increased by the amendment might be dependent on the ... Cement and Concrete - Page 1860 - Google Books Result https://books.google.com/books?isbn=0412790505 M.S.J Gan - 1997 - Technology & Engineering A schematic representation of the stages of cement hydration as indicated by the rate of ... The reactivity of the phases is dependent on such factors as the mean ... Modern Concrete Materials: Binders, Additions and Admixtures : ... https://books.google.com/books?isbn=0727728229 Ravindra K. Dhir, Thomas D. Dyer - 1999 - Technology & Engineering The clinker phases in Portland cement are generally much more reactive than the ... The final hydrate assemblage is dependent on the combined chemical ... Rheology of Fresh Cement and Concrete: Proceedings of an ... https://books.google.com/books?isbn=0419153608 P.F.G. Banfill - 1990 - Architecture ... lower sulphatization degree can be classified as less reactive ones. The consistency of cement pastes obtained from these clinkers and its time dependence ... Reinforced Concrete Designer's Handbook, Eleventh Edition https://books.google.com/books?isbn=0203087755 Charles E. Reynolds, James C. Steedman, Anthony J. Threlfall - 2007 - Architecture Concrete 15 Cements are now classified in terms of both their standard strength, ... and are more dependent on factors such as workability, cement content, use of ... are found in some soils and groundwaters, a reaction can occur between the ...
