包钢粉煤灰的综合利用

本文分析了包钢粉煤灰排放及污染现状,包钢粉煤灰的理化性能,叙述了粉煤灰综合利用途径及包钢粉煤灰综合利用方向及可行性,并对其实施提出了建议.     

包钢高炉渣综合利用途径的研究

本文分析了高渣综合利用的途径,针对包钢高炉渣的排放及其特性,进行利用高炉渣,粉煤灰制做建筑砌块的试验和研究。结果表明生产的砌块各项指标均达到建筑要求,为今后包钢高炉渣的综合利用提供了技术依据。     

鞍钢粉煤灰综合利用途径的探讨

概述了世界某些国家及我国粉煤炭资源的开发利用情况和今后发展的动向。结合鞍钢实际,着重叙述了鞍钢粉煤灰排放现状以及今后十年应考虑的粉煤灰综合利用途径问题。     

粉煤灰物性与资源化利用

为了减轻粉煤灰对环境的污染及提高其综合利用率,本文阐述了粉煤灰综合利用的重要性,介绍了粉煤灰的物理化学性质及矿物组成。通过粉煤灰性能的研究,介绍了粉煤灰在建筑材料、农业、筑路、生态回填和环境保护等方面的综合利用。最后对粉煤灰的综合利用进行展望。     

我国粉煤灰综合利用研究进展

粉煤灰是我国固体废弃物污染的主要来源之一，它严重污染了环境并侵占了大量土地，急待回收利用。本文介绍了粉煤灰的基本性质和组成，概述了我国粉煤灰在建筑、化工、环保和冶金等方面综合利用的研究进展及发展前景。     

包钢钢渣筑路的实践

截止1990年底,包钢渣场已堆积钢渣近700万吨,每年还以50万吨速度增加着。如此众多的钢渣出路何在?这是摆在包钢人面前的紧迫课题。钢渣用于筑路是钢渣综合利用途径之一。不但处理大量钢渣且节约其所占用的耕地,而且为道路工程开辟了新的材料来源。包钢钢渣筑路实践表明,钢渣用做基层材料时应掺入粉煤灰、燃煤炉渣、石灰、土等外掺剂。其中,以钢渣75％、粉煤灰17％、石灰8％配比或钢渣60％、煤渣30％、石灰10％配比混合料为佳(后者技术指标优于前者)。按此设计方案用钢渣做基层材料,其放射性水平平均为14.μR/h,不超过国家控制标准。经路面测试,各项指标均达到煤渣石灰土基层普通碎石路面的质量控制标准。实践证明,包钢钢渣筑路用做道路基层材料技术上是可行的,经济上是合理的,是钢渣综合开发利用主要途径之一。     

利用粉煤灰生产免烧承重砖

利用粉煤灰等工业废渣生产免烧承重砖，属资源综合利用的新型建材项目，该产品质量可靠，效益可观。     

采用粉煤灰为原料生产氧化铝脱硅工艺及装备

介绍了粉煤灰资源的分布及综合利用粉煤灰生产氧化铝传统生产工艺的技术背景,着重描述综合利用高铝粉煤灰生产氧化铝的新工艺预脱硅+碱石灰烧结法其核心技术预脱硅工艺和预脱硅工艺指标及工艺装备,并对脱硅工艺装备适用情况及发展方向提出了建议。     

对包钢高炉渣综合利用的思考

文章依据包钢高炉渣的理化性能,分析了目前包钢高炉渣的综合利用情况及存在问题,同时结合国内先进钢厂对高炉渣的利用情况,提出了包钢高炉渣如何进一步综合利用,实现高炉渣资源化、效益化的对策建议。     

扫描电镜对粉煤灰的分析

燃煤电厂每天都要排出大量的粉煤灰,如果不能妥善处理,必然会对环境造成很大污染。目前,国内已经创造了许多综合利用粉煤灰的好方法。如用粉煤灰作为净化一级处理后含油污水的吸附剂,然后沉淀回收已吸附污油的粉煤灰作为建筑     

粉煤灰混凝土的试验研究

文章对掺粉煤灰混凝土的系列配合比进行设计,经对粉煤灰掺量分别为20%、25%、30%的系列粉煤灰混凝土配合比进行试验,其中掺量为25%的粉煤灰混凝土其工作性能效果最佳。粉煤灰混凝土的优点是混凝土的工作性能好,混凝土坍落度损失小,适用于商品混凝土及远距离运输,提高工程质量,节约水泥,降低混凝土成本,节约资源等。     

水浴洗涤式除尘器试验及应用研究

介绍了水浴洗涤式除尘器用于除尘和脱硫的机理,并对此除尘系统的除尘效率和阻力特性进行了试验研究。结论表明:水浴洗涤式系统简单,除尘器除尘效果好,阻力低,还可对烟气脱硫,在工业小型工业锅炉中有应用前景。     

TENSILE PROPERTIES OF CLASS C FLY-ASH AS A FOUNDRY CORE BINDER

Fly-ashes are a potential alternative sand binder for production of foundry sand molds. They have previously been evaluated as binders for the main body of the mold, where they displayed suitable properties. Binders are also needed for producing foundry mold cores, which are separate shapes of sand that are placed in the mold to provide castings with contours, cavities, and passages that are not practical to produce with a simple mold. These cores have considerably higher strength requirements than the main mold and the ability of Class C fly-ash to meet the tensile strength requirements for cores was therefore evaluated.     

粉煤灰硫酸化焙烧提取氧化铝的研究

研究了粉煤灰硫酸化焙烧提取氧化铝的工艺。对焙烧温度、时间、酸矿比、粒度等影响因素进行了研究,确定最佳工艺条件:粉煤灰粒度为-400目占95%以上,焙烧温度320℃,时间2h,酸矿比1.6,在此条件下粉煤灰中氧化铝浸出率可达87%,且硫酸试剂通过再生实现循环利用。通过XRD和扫描电镜对酸焙烧过程中粉煤灰的物相变化进行了研究。     

CuO对钢渣微晶玻璃机械性能及颜色的影响

为了提高钢渣的利用率,以钢渣和粉煤灰为主要原料,采用烧结法制备钢渣微晶玻璃。通过向钢渣微晶玻璃中引入CuO添加剂,研究了其机械性能及外观颜色的变化。实验结果表明：加入CuO的钢渣微晶玻璃主晶相为透辉石;随着CuO加入量的增多,微晶玻璃抗弯强度逐渐增大; CuO的添加使钢渣微晶玻璃颜色有了明显改变。     

含铜废水的吸附处理研究

探讨了用热改性膨润土处理含Cu^2 废水的工艺条件，并与粉煤灰和活性炭进行了比较。实验结果表明：当Cu^2 的初始浓度不大于100mg／L时，过200目的热改性膨润土的用量为5g／L、pH=7、搅拌速度为300r／min、吸附时间30min，热改性膨润土对Cu^2 的去除率达99．5％以上。     

COMPARISON OF CLASS C AND CLASS F FLY-ASHES AS FOUNDARY SAND BINDERS AND THE EFFECTIVENESS OF ACCELERATORS IN REDUCING CURING TIME

Fly-ashes are a potential alternative to conventional bentonite to be used as binders for the production of foundry sand molds. The performance of two different fly-ashes in this application was evaluated. These fly-ashes were classified as a Class F (pozzolanic) ash and a Class C (pozzolanic and cementitious) ash according to American Society for Testing and Materials (ASTM) specifications. It was determined that both types of fly-ash could reach bonding strengths in the test specimens that were higher than that achieved with bentonite. However, the Class C ash required less than one-tenth as much curing time as the Class F ash to reach strengths comparable to those of bentonite-bonded specimens. It was also determined that the use of accelerators allowed the necessary curing time of Class C ash to be reduced to less than an hour.     

Sintering Characteristics of Al–Pb/Fly-Ash Metal Matrix Composites

Aluminum–lead/10 wt% fly-ash powder mixtures containing 0–20 wt% lead (Pb) were prepared. These powder mixes were compacted in the pressure range of 200–400 MPa by single action die compaction process. The prepared compacts were sintered in the temperature range of 500, 530, 560 and 590 °C in an argon gas atmosphere for duration of 45 min. For the sintered compacts, the sintered density, hardness and compressive strength were reported. Sintered density, hardness and compressive strength increased with the increase in compaction pressure. Sintered density increased whereas the hardness and the compressive strength decreased with the addition of Pb.     

Polymer Concrete Using Coal Fly Ash

The disposal of coal combustion byproducts wastes has been a pressing issue during the past few decades. In parallel, the formulation of high-performance materials that are stronger and more durable than conventional cement-based materials has emerged as an issue of considerable importance in the construction industry. This paper shows that it is possible to utilize fly ash, a byproduct of coal burning, to produce a high-performance material at a potentially lower cost and without compromising its structural integrity. The high-performance material reported in this study is polymer concrete (PC) made with fly-ash fillers. The PC is investigated for its compressive strength, flexural strength, creep deformation, and bond strength of PC overlay on portland cement concrete under thermal cycling. The use of fly ash as an aggregate in PC is very promising because it enhances the physical properties of the material and particularly its compressive and flexural strength. PC using fly ash could be used as an overlay in pavement, bridges, and runways or in precast applications such as utility, transportation, and hydraulic components.     

矿产资源定价方法的实证研究

文中分析了资源－环境－经济一体化核算的研究现状及存在的问题,界定了矿产资源核算的内涵及其对象,论述了矿产资源定价的理论基础,探讨了矿产资源的各种定价方法及其优缺点,适用范围,建立相应的估价模型,并进行了实证分析,这项研究对我国的资源－－环境－经济一体化核算的理论研究与实践进展具有重要的理论意义和现实意义。