以电炉还原渣重构转炉钢渣的组成与性能

掺加电炉还原渣重构转炉钢渣的组成和结构制备了高胶凝活性的钢渣。采用化学全分析、XRD、SEM等手段分析了钢渣重构前后的组成、水化产物形貌,并进行了力学性能试验。结果表明:重构钢渣矿物组成以活性硅酸二钙、硅酸三钙和七铝酸十二钙等胶凝矿物为主。当电炉还原渣掺量分别为10%和20%、煅烧温度分别为1 350℃和1 250℃时,重构钢渣水泥的活性指数分别为102.9%和104.0%。掺重构钢渣水泥28 d龄期水化产物与普通硅酸盐水泥的相似,但浆体结构更为致密。     

不同钢渣用于天然橡胶复合材料试验研究

以乙二醇和三乙醇胺配制助磨改性剂对转炉热闷渣、转炉风碎渣及电炉热闷渣进行助磨改性制备钢渣微粉,并将其应用与天然橡胶复合材料.试验结果表明:转炉热闷渣、转炉风碎渣及电炉热闷渣微粉均对天然橡胶的力学性能和阻燃性能有一定的提升效果.     

黄磷尾渣超细粉粒度特性和掺量对混凝土性能的影响

对比棒磨和球磨条件下,黄磷尾渣-0.075 mm、-0.045 mm所占百分比与磨矿时间的关系,确定球磨为合适的磨矿方式;在球磨方式下,考察磨矿时间对黄磷尾渣的粒度特性和比表面积的影响;基于Rosin-Rammler-Bennet（RRB）分布方程建立模型,结果证实黄磷尾渣磨矿特性符合RRB分布. 黄磷尾渣超细粉的特征粒径（De）和比表面积对混凝土强度都呈现出先增大后减小的趋势,混凝土强度（凝结时间1 d）最大值在特征粒径为59.76 μm,比表面积为530.15 m2/g,黄磷尾渣掺量为25%时出现,为27.429 MPa.     

磷渣粉的粒径分布与其活性的灰色关联分析

研究了磷渣粉比表面积对其胶凝活性的影响,运用灰色关联理论分析了其粒径分布与活性指数的关系。结果表明:粒径30.2μm以上的颗粒对磷渣粉的活性起削弱作用,粒径0.00~30.2μm的颗粒对其活性起增强作用。其中,粒径5.0~10.0μm颗粒的含量是影响磷渣粉7d活性指数A7的关键因子,粒径10.0~20.0μm颗粒的含量是影响28d活性指数A28的关键因子。为提高磷渣粉的胶凝活性,其比表面积不宜低于397m2·kg-1,同时,应尽可能提高磷渣中粒径为5.0~30.2μm,尤其是粒径5.0~20.0μm的颗粒含量,并减少或限制粒径大于30.2μm的颗粒含量。     

锂渣粉对水泥性能的影响

主要研究了不同细度锂渣粉作为掺合料时对胶凝材料需水量、强度以及与外加剂适应性的影响和锂渣作为混合材对水泥物理力学性能的影响。研究结果表明:以不同细度的锂渣粉代替30%水泥,随锂渣粉细度增加,胶凝材料需水量增加,3 d强度大幅降低,28 d强度降低较小,这说明锂渣粉作为掺合料的掺量不宜过大;当外加剂掺量为胶凝材料的5‰、锂渣粉比表面积为901 m2/kg、锂渣粉代替12%水泥时,水泥与外加剂适应性较好。锂渣粉作为混合材掺量在6%以内,水泥的凝结时间正常,安定性合格,28 d强度满足P O42.5要求,早期强度稍低于对照组,但后期强度与对照组相当甚至高于对照组强度。     

赤泥-高炉矿渣-钢渣三元体系注浆材料试验研究

为解决地下工程灾害治理中大量消耗水泥造成的环境污染、造价高等问题,本文基于协同理论制备了赤泥-高炉矿渣-钢渣基三元体系全固废类注浆材料,系统研究了钢渣对赤泥-高炉矿渣二元体系工作性能、力学强度的作用规律,并结合X射线衍射、傅里叶变换红外光谱、扫描电镜、压汞仪等微观测试手段分析其作用机理。试验结果表明：钢渣对赤泥-高炉矿渣二元体系力学强度具有提升作用,当其掺量为10%时,28 d抗压强度可达12.78 MPa,增幅为59.84%。钢渣经机械粉磨和高温活化后,其协同作用可进一步提高,随着钢渣粒度的减小,浆液结石体力学强度逐渐增强;随着活化温度提升,结石体力学强度呈先增加后减小的趋势。钢渣在10%最优掺量下,活化温度为700 _^oC,粒径为200目时,赤泥-高炉矿渣-钢渣基注浆材料结石体的力学强度最优,28 d强度达到15.1MPa。此外,钢渣的掺入还可以促进赤泥-高炉矿渣基浆液的凝结,凝结时间缩短,浆液的流动性降低。微观分析表明：钢渣可参与赤泥-高炉矿渣体系的水化反应,而且钢渣微粒在浆液结石体中具有充填效应,使结石体更加密实,进而提高结石体力学强度;此外,在高温条件下,钢渣中生成钙芒硝,硅酸二钙,硅酸三钙,铝酸钙胶凝矿物,可促进钙矾石和水合铝酸钙的生成,对强度具有提升作用。     

钢渣颗粒粒径分布对水泥强度影响的灰色关联分析

根据灰色关联原理,运用灰色关联分析方法研究了不同粒径范围内的钢渣颗粒对掺钢渣水泥各龄期强度的影响.结果表明:钢渣粉中不同粒径范围内的颗粒对水泥不同龄期抗折、抗压强度的贡献不同,其中10.0~19.9μm范围的颗粒与各龄期强度的关联度均最大,且均为正关联,是强度的关键因子;小于5.0μm和大于45.7μm的颗粒与强度的关联度均较小;而大于30.2μm的颗粒与各龄期强度均为负关联,对强度有不利的影响.在实验条件下,可以确定钢渣的最佳粉磨时间为30 min,其比表面积为431.5 m2/kg.     

基于正交设计高性能钢铁渣粉的制备与性能研究

为了制备出性能优良的钢铁渣粉,试验采用L_9(3~4)正交设计,考察了矿渣粉细度、钢渣粉细度及掺量等三因素对胶砂流动度和抗压强度的影响,并进行了极差分析,方差分析及性能指标分析。基于优化结果研究了钢铁渣粉胶砂的泌水性和干缩性能,通过MIP分析了硬化水泥浆体的孔结构。结果表明:当钢铁渣粉取代水泥50%(质量分数,下同)时,三因素对不同龄期胶砂抗压强度的影响规律一致;钢渣粉细度是胶砂流动度的显著性影响因素,但对胶砂抗压强度的影响"不显著";适当降低钢渣粉掺量,提高矿渣粉细度对提高钢铁渣粉的胶凝活性有利,优化的钢铁渣粉参数为钢渣(348m~2/kg)∶矿渣(452m~2/kg)=30%∶70%;与单掺矿渣粉相比,优化的钢铁渣粉砂浆泌水率为0,4d和80d胶砂干缩率分别下降了19.71%和14.43%,同时优化了硬化水泥浆体的孔结构。     

330 MW CFB锅炉滚筒冷渣器流渣原因及应对措施分析

滚筒冷渣器广泛应用于循环流化床（CFB）锅炉机组上,其运行可靠性和热量回收性能是保障锅炉机组高效稳定运行的关键.从冷渣器的结构和锅炉机组运行的角度出发,详细分析了宁夏国华宁东电厂330MW CFB机组上滚筒冷渣器流渣的原因.针对滚筒冷渣器设计、返料腿和排渣口结构等方面提出了相应的优化方案,并在锅炉运行方式,入炉煤粒径控制及煤种掺烧等方面进一步提出了抑制冷渣器流渣的措施.     

CaO改性对合成渣矿相及易磨性的影响

使用分析纯试剂配制CaO—SiO2-MgO-Fe2O3四元合成渣系,调节该合成渣中CaO的含量,采用SEM,EDS,XRD等方法分析其矿相变化规律。粉磨不同CaO含量的渣样及风淬钢渣,采用激光粒度分析仪对其进行粒度测试,研究渣中CaO含量对其易磨性的影响。结果表明：随着CaO含量的增加,渣中易磨的硅酸盐相所占比例增大,难磨的RO相含量减少,CaO的加入改善了渣的易磨性。     

Activity of reducing steel slag of EAF

Reducing steel slag (RSS) was mainly acquired from five electric-arc furnace (EAF) steelmaking plants (among them, the products of two plants were carbon steel and those of other plants were stainless steel) for research tests. The chemical properties, compound compositions, activities and contents of main expansive compounds were tested. The results showed that the field sampled RSS had a very high crystallinity and hydraulicity with main chemical compositions close to those of Portland cement. It can be known from the study that in case of C/S ratio higher than 2.0, the main compound compositions are C₂S, C₃S, C₂F and f-CaO. However, after the RSS was stored for six months, an obvious variation occurred with potential pre-hydration in RSS, where the SO₃ content was slightly reduced and the compressive activity index was obviously higher than that at the 28th day.     

钢渣OGFC-13型排水沥青混合料的配合比设计及性能研究

以钢渣为粗集料、石灰岩为细集料、矿粉为填料、SBS改性沥青为结合料配制OGFC-13型开级配钢渣排水沥青混合料,其配合比为m（（13.2~19）mm钢渣）∶m（（9.5~13.2）mm钢渣）∶m（（4.75~9.5）mm钢渣）∶m（（0~4.75）mm石灰岩）∶m（矿粉）=13∶28∶45∶13∶1,最佳油石比为4.5%,聚脂纤维用量为0.3%。该沥青混合料的钢渣用量高达86%,且不用提高改性沥青和纤维用量,有利于钢渣的综合利用,节约道路建设成本。通过马歇尔稳定度、冻融劈裂强度和车辙试验得出,该沥青混合料的马歇尔稳定度为9.8kN,劈裂强度比为89.8%,动稳定度为5753次/mm,均优于技术规范要求。该沥青混合料的渗水系数为37.0mL/s,摩擦系数（BPN值）为70.7,表明其渗水能力很强,抗滑性能优良。     

Design and Preparation of Steel Slag SMA

1　IntroductionSteelslagisabyproductfromsteelindustryandhardlyusedforalongperiod .Takingsteelslagasanag gregateisabetterwaytodealwithsteelslag .SMA (stonematrixasphalt)originatesinGermanyandisanasphaltpavementstructureprovidedwithexcellentpavementper formance .NowSMAisusedwidely ,buttherequirementoftheaggregatesofSMAisratherrigorous .Thephysicalme chanicsofsteelslagcanmeettherequirementofSMA .ThetargetsofusingsteelslagtodesignandprepareSMAconcrete,therefore ,arenotonlytodecreasepollutio…     

钢渣与废旧轮胎颗粒混凝土的强度与收缩变形性能

为研究钢渣部分或全部替代天然集料对混凝土基本力学性能和体积变形行为的影响,对使用不同种类集料混凝土的抗压强度、抗折强度、干缩变形和早期塑性开裂进行了试验研究。结果表明:钢渣取代天然集料将使抗折强度稍微降低而抗压强度有一定提高,也将显著改善混凝土的早期塑性开裂行为;废旧轮胎胶粉颗粒取代10%细集料能够显著降低全级配钢渣集料混凝土的膨胀、普通混凝土的干燥收缩,也将使混凝土的强度有所降低;弹性废旧轮胎胶粉颗粒的使用,可以改善钢渣混凝土的体积变形。     

Experimental Study on the Expansion Behavior of Full Aggregate Steel Slag Concrete

全集料钢渣混凝土膨胀性能试验研究

于峰¹,王旭良²,张扬¹,方圆^1*

（1.安徽工业大学 建筑工程学院,安徽 马鞍山243032;2.中国十七冶集团有限公司,安徽 马鞍山243000）

摘要：

为提高钢渣的利用率,开展全集料钢渣混凝土膨胀性能试验研究,采用正交试验方法,分析砂率、水灰比、钢渣砂含量、钢渣砂取代粒度、粗钢渣掺量及粗钢渣取代粒径等因素对全集料钢渣混凝土膨胀性能的影响。试验结果表明,随着钢渣砂取代粒径或粗钢渣掺量的逐渐增大,全集料钢渣混凝土膨胀率逐渐降低;随着水灰比或钢渣砂含量的逐渐增大,全集料钢渣混凝土膨胀率先增大后减小。钢渣砂含量和钢渣砂取代粒径对全集料钢渣混凝土的膨胀性能影响最为显著。在试验研究的基础上,充分利用钢渣的膨胀性能,合理建议自应力钢管混凝土和收缩补偿混凝土的配合比。基于单因素加权拟合方法,提出全集料钢渣混凝土膨胀率的近似预测公式。

关键词：钢渣混凝土;正交试验;膨胀性能;水灰比;砂率

     

改性钢渣的制备及其吸附除磷性能

研究了改性钢渣吸附除磷影响因素、等温吸附线特征和吸附动力学,并对生物处理后的出水进行吸附除磷研究。结果表明：在初始磷浓度10 mg/L,投加量10 g/L、pH为7时,改性钢渣吸附后总磷浓度为0.687 mg/L,去除率达93%;改性钢渣对磷的吸附符合Langmuir模型,理论饱和吸附量是1.977 mg/g,吸附动力学符合准二级动力学模型（R²>0.99）;实际生活污水的吸附除磷中,投加量为50 g/L,反应2 h后出水总磷浓度达到《城镇污水处理厂污染物排放标准》（GB 18918-2002）一级B标的排放要求。     

Methods for improving volume stability of steel slag as fine aggregate

Suitable methods for enhancing the volume stability of steel slag utilized as fine aggregate were determined. The effects of steam treatment at 100 ℃ and autoclave treatment under 2.0 MPa on the soundness of steel slag sand were investigated by means of powder ratio, linear expansion, compressive and flexural strength. DTA, EDX, XRD and ethylene glycol methods were employed to analyze both the treated slags and susceptible expansion grains. Experimental results indicate that powder ratio, content of free lime and rate of linear expansion can express the improvement in volume stability of different treated methods. Steam treatment process cannot ultimately prevent specimens from cracking and decrease of strength, but mortar made from autoclave treated slag keeps integration subjected to hot water of 80℃ until 28 d and its strength do not show significant decrement. The hydration of over-burn free lime and periclase phase are the main cause for the disintegration or crack of untreated and steam treated steel slag＇s specimens. Autoclave treatment process is more effective than steam treatment process on enhancement of volume stability of steel slag.     

Effect of Fine Steel Slag Powder on the Early Hydration Process of Portland Cement

1 IntroductionSteel slag is the waste residue of fluxing mineralsused in the process of steel producing. Its dischargeamount is about 10 % of the production of steel . Steelslag hasn’t been utilized widely and effectively in a longperiod of time[1]. Hundreds of million tons of steel slagare deposited,andthe amount is still increasing withtensof milliontons every year .The deposited steel slag occu-pies great amounts of farmlands and induces serious en-vironment problems . The main chemical c…     

Optimization of Blended Mortars Using Steel Slag Sand

A new kind of mortar made of ground granulated blast-furnace slag （GGBFS）, gypsum, clinker and steel slag sand （〈4.75 mm） was developed. The ratio of steel slag sand to GGBFS was 1 ： 1 and the amount of gypsum was 4% by weight while the dosage of clinker ranged from 0% to 24%. The optimization formulation of such mortar was studied. The content of steel slag sand should be less than 50% according to the volume stability of blended mortar, and the dosage of clinker is about 10% based on the strength development. Besides strength, the hydration heat, pore structure and micro pattern of blended mortar were also determined. The experimental results show the application of steel slag sand may reduce the dosage of cement clinker and increase the content of industrial waste product such as GGBFS, and the clinker is also a better admixture for blended mortar using steel slag sand.