选矿技术在铜渣综合利用中的应用

我国铜产量97%以上由火法冶炼生产,含铜冶炼炉渣数量巨大,而且年排放量呈逐年增加趋势。铜冶炼渣的选矿技术是通过对铜渣的可选性研究,改进铜渣选矿流程,研究铜渣选矿药剂制度,优化铜渣选矿的技术条件,促进铜冶炼渣产业技术的提升,以提高金属的回收率和做好渣的综合利用,减少资源浪费,杜绝环境污染,促进铜渣的循环利用。     

再生铅冶炼的土壤环境影响评价

再生铅冶炼是对铅废弃物的循环利用,也是防治铅污染的重要手段,但如果在冶炼过程中处置不当,会引起土壤污染。为此,本文着重就再生铅冶炼对土壤的环境影响与评价进行研究。首先进行环境影响识别,并根据冶炼中的铅排放强度和铅在土壤的循环规律,探讨了土壤环境质量现状分析、评价和预测等研究方法。     

基于铜冶炼烟尘环保处理研究

近年来,铜冶炼的发展加快,其产生的污染也逐步加剧,环境保护成为我国必须重视和解决的问题。在粗铜冶炼过程中,产生大量的二氧化硫烟气,其环境保护更是人们关注的方向。环境保护是社会和谐发展必须首要解决的问题,文章对铜冶炼的环境保护进行分析,并采取相关措施予以解决。     

我国主要再生有色金属产量将大增

工信部2月10日在其官网发布与科技部、财政部联合制订的《再生有色金属产业发展推进计划》称,到2015年,我国主要再生有色金属产量将达1200万吨,其中再生铜、再生铝、再生铅占当年铜、铝、铅产量的比例分别达到40％、30％、40％。     

减少天然气在反射阳极炉消耗量的研究及应用

本文介绍了天然气在铜冶炼反射阳极炉使用中的情况,全面分析了影响冶炼过程中天然气耗量的各种因素,并提出了实施技术改进的几种方法。     

一种从含高铜高硒的碲化亚铜中提取碲的环保工艺

我国冶炼铜500万吨/年,每年还呈现递增趋势,含碲物料丰富.本文开发一种环保节能型工艺,浸出、除铜、富集、控电位还原,回收其中铜、硒、碲,回收率高.     

铜精矿采购的经济性评价

铜精矿采购的经济性评价就是对拟采购铜精矿采用一定的评价方法，基于科学的评价模型和合理的评价参数，对铜精矿经冶炼企业加工成精铜并出售是否具有经济效益所进行的评价，是进行铜精矿采购决策的主要依据。由于我国铜冶炼企业对铜精矿的依存度高及市场竞争激烈，铜精矿采购的经济性评价极其重要。     

阳极铜定量浇铸工艺概述

近年来,我国通过自主研发和借鉴国外先进的生产技术,已经开发出自主的圆盘定量浇铸系统,逐渐满足了国内铜冶炼技术的发展,改变了定量浇铸技术以奥拓昆普为代表的外国公司垄断的局面.文章介绍了阳极板的生产工艺流程、圆盘浇铸机的主体结构、定量浇铸等,实现了我国自主开发的圆盘定量浇铸系统对铜冶炼生产产能的需求.     

阳极铜定量浇铸工艺概述

近年来,我国通过自主研发和借鉴国外先进的生产技术,已经开发出自主的圆盘定量浇铸系统,逐渐满足了国内铜冶炼技术的发展,改变了定量浇铸技术以奥拓昆普为代表的外国公司垄断的局面。文章介绍了阳极板的生产工艺流程、圆盘浇铸机的主体结构、定量浇铸等,实现了我国自主开发的圆盘定量浇铸系统对铜冶炼生产产能的需求。     

铜冶炼设备点检工作思考与探讨

文章就铜冶炼设备点检工作进行探讨,具体分析了点检工作的流程以及管理方法,希望对设备的点检工作带来帮助。     

Why Regenerative Agriculture?

Regenerative agriculture is both an attitude and a suite of practices that restores and maintains soil health and fertility, supports biodiversity, protects watersheds, and improves ecological and economic resilience. It focuses on creating the conditions for life above and below ground and takes its cues from nature, which has a very long track record of successfully growing things. By re-carbonizing soils via photosynthesis and biology, particularly on degraded land, regenerative agriculture can also sequester increasing quantities of atmospheric carbon (CO₂) underground, making it a low-cost “shovel-ready” solution to climate change. Its multiple co-benefits, including the production of healthy, nutritious food, means it will be a critical component of our response to rising climate instability.     

Perfect simulation for models of industry dynamics

In this paper we introduce a technique for perfect simulation from the stationary distribution of a standard model of industry dynamics. The method can be adapted to other, possibly non-monotone, regenerative processes found in industrial organization and other fields of economics. The algorithm we propose is a version of coupling from the past. It is straightforward to implement and exploit the regenerative property of the process in order to achieve rapid coupling.     

An integrated structural model toward successful continuous improvement activity

This paper provides a different view from Bassent et al.'s (2001) toward a successful continuous improvement (CI) activity. Their concept encourages a business that is resting on its present accomplishments to seek greater gain. However, their behavioral model is not easy to operate for managers. In order to operate CI activity effectively and obtain company-wide involvement for management, we need a system which can meet the current CI status and lead the firm toward the correct road as described by Bessant et al. This system has to be open in the way that it can fit into any organization so that it can easily embed the necessary regenerative input into its physical structure. This system has also to be super in the way that it can successfully lead the organization structure toward the evolutionary route.Thus, we propose an open super system which places a pyramid composed by problem, models and tools, and promotion, at its core. Using Bessant et al.'s five evolutionary levels as a time map, this system can analyze a firm's improvement ability from the presentation of cases and find the proper regenerative input from the failure status. A firm can inject this input into its structure to upgrade its level of capability.Applying this open super system on our previous studies, we derived five improvement levels and the different ability types in each level. From there, we discovered some failure status in each level. We also drew some important perspectives on the injection of regenerative input from failure status, including the promotion of the technique-excellence ability, the value problem, and efficiently solving problem. To help the readers to understand this system better, we give ‘AB two stage’ system as an example to show how to inject regenerative input into the physical structure to fulfill the expectations from different perspectives.     

Resolving uncertainty in manufacturing systems

This paper examines the effectiveness of three commonly practiced methods used to resolve uncertainty in multi-stage manufacturing systems: safety stock under regenerative material requirements planning (MRP) updates, safety capacity under regenerative MRP updates, and net change MRP updates, i.e., continuous rather than regenerative (periodic) updates. The use of safety stock reflects a decision to permanently store materials and labor capacity in the form of inventory. When unexpected shortages arise between regenerative MRP updates, safety stock may be depleted but it will be replenished in subsequent periods. The second method, safety capacity, overstates the MRP capacity requirements at the individual work centers by a prescribed amount of direct labor. Safety capacity either will be allocated to unanticipated requirements which arise between MRP regenerations or will be spent as idle time. The third method, net change, offers a means of dealing with uncertainty by rescheduling instead of buffering, provided there is sufficient lead time to execute the changes in the material and capacity plans.Much of the inventory management research has addressed the use of safety stock as a buffer against uncertainty for a single product and manufacturing stage. However, there has been no work which evaluates the performance of safety stock relative to other resolution methods such as safety capacity or more frequent planning revisions. In this paper, a simulation model of a multi-stage (fabrication and assembly) process is used to characterize the behavior of the three resolution methods when errors are present in the demand and time standard estimates. Four end products are completed at an assembly center and altogether, the end products require the fabrication of twelve component parts in a job shop which contains eight work centers. In addition to the examination of the three methods under different sources and levels of uncertainty, different levels of bill of material commonality, MRP planned lead times, MRP lot sizes, equipment set-up times and priority dispatching rules are considered in the experimental design.The simulation results indicate that the choice among methods depends upon the source of uncertainty, and costs related to regular time employment, employment changes, equipment set ups and materials investment. For example, the choice between safety stock and safety capacity represents a compromise between materials investment and regular time employment costs. The net change method is not designed to deal effectively with time standard errors, although its use may be preferred over the two buffering alternatives when errors are present in the demand forecasts and when the costs of employment changes and equipment set ups are low. The simulation results also indicate that regardless of the method used, efforts to improve forecasts of demands or processing times may be justified by corresponding improvements in manufacturing performance.     

沥青路面再生设备在高等级公路上的应用

高等级沥青路面维修量的不断增加,沥青混凝土路面的维修成本也在提高,旧路面废弃料也在增加,沥青路面再生技术对旧沥青混合料的再生利用,即节省了材料,又节省了资金。     

锅炉排烟余热高能级深度利用研究

本文对1000MW级超超临界机组加装低温烟气换热器方案做了简单的介绍,通过除尘器入口及引风机出口设置低温烟气换热器的方式,采用凝结水换热,降低吸收塔入口烟气温度,同时减少了低加回热抽汽量,实现高效节能、节水。     

企业内部控制存在的问题及对策

在资讯产业已经发达的当今社会,不断完善企业内部控制制度,对于防范舞弊,减少损失,提高资本的再生能力具有积极的意义。我国企业内部控制制度普遍薄弱,本文试图从我国内部控制的现状及其存在的问题入手提出解决的对策。     

上海现代生物产业聚焦研究

上海现代生物产业的发展现状不尽如人意,缺乏适度聚焦是重要原因之一。本文引入“两链一力”这一分析工具,从技术链、产业链和竞争力的三维角度探讨上海现代生物产业的聚焦选择,并提出了基因工程药物、再生医疗、生物疫苗、CRO、分子育种及生物反应器五个聚焦领域。     

New results in retrial queueing systems with breakdown of the servers

We consider retrial queues with servers that are subject to active breakdowns. First, we concentrate on Markovian queueing models. For the multiserver case we obtain sufficient conditions for ergodicity. For the singleserver case we introduce new performance measures: the "orbit" idle period and the "orbit" busy period. Further, we investigate the asymptotic behaviour under high intensity of retrials. We also give an algorithm to compute the steady-state probabilities for the M/G/l retrial queue with breakdowns. The algorithm is based on a regenerative approach.     

A structural model of aircraft engine maintenance

We develop and estimate a simple regenerative optimal stopping model of aircraft engine maintenance that attempts to describe the behaviour of airline maintenance personnel. The model assumes that the decision to send an engine to the shop for overhaul is the solution to a stochastic dynamic programming problem that trades off the expected cost of continuing operation with the attendant risk of engine failure with the cost of performing the overhaul. We estimate the model using 42 engine histories from Pratt & Whitney, Inc. Estimation results indicate that such a model does not explain observed engine histories before deregulation, but does fit the data in the era since deregulation. The model also provides insight into the perceived relative costs of engine maintenance, in-flight shutdown, and ordinary operation.