基于给排水工程的水玻璃改性研究

粘结剂是冷固结工艺生产球团矿中必不可少的一种原料,它决定着铁矿球团的生产质量。普通水玻璃粘结性强度不高,作为粘结剂生产的铁矿球团的抗压强度较低,不能满足钢铁冶炼的要求。基于此对水玻璃进行改性研究,实验结果表明当复合改性剂双组份质量比为11,加入量为2%时,改性粘结剂粘结强度较高,利用其生产的球团抗压强度可达2.75 k N/个,满足高炉冶炼的需要。     

钙基膨润土提纯制备球团黏结剂试验

以朝阳钙基膨润土为原料,采用擦洗-分散-分选的流程对其进行提纯,并对提纯膨润土进行挤压钠化改型试验.试验结果表明,当选用朝阳钠化提纯膨润土做球团黏结剂,粘结剂添加量为1.1％时,生球的落下强度为4.0次,爆裂温度为525℃,干球抗压强度为306 N/个,可以满足冶金球团性能需要.采用钠化提纯膨润土制备球团黏结剂可以有效降低球团中黏结剂的添加量.     

焦粉冷压成型粘结剂的选择研究

焦炭的生产、运输及使用过程中会产生大量粒度小于10 mm的焦粉,不能得到有效的利用,导致焦碳资源的浪费。研究中采用配加不同种类粘结剂,对焦粉进行冷压成型处理,制备出满足工业强度要求的型焦,系统研究了粘结剂种类及用量对型焦强度地影响以及粘结剂在型焦中的作用机理。研究表明,与单种粘结剂相比,采用羧甲基纤维素钠与膨润土作为复合粘结剂使用时,型焦强度得到有效地提升。0.8%羧甲基纤维素钠与5%膨润土复合使用时,型焦的湿团落下强度为12.2次/0.5m,干团落下强度为24.4次/m,干团抗压强度为850.3 N/个。     

配方精选

正用于铁矿球团的复合粘合剂钠基膨润土40~70累托石30~60添加剂0.1~1性能及用途:该品能提高生球抗压强度、落下强度、干球抗压强度、爆裂温度、成品球抗压强度和成品球全铁品位的特点。新型铁矿球团粘合剂碱性增氧剂氧化钙15~35     

湿法磷酸渣酸作为低品位磷矿粉造球黏结剂的试验研究

对湿法磷酸渣酸作为磷矿粉的造球黏结剂进行了研究。考察了配碳量对球团抗压强度、抗摔强度的影响。结果显示：随球团配碳量增加,球团抗压强度和抗摔强度逐渐减低;当球团中不配加焦炭时,机械强度最高,平均球团强度为293.17 N,1.5 m落下破碎率为6.7%。随还原温度和配碳量升高,磷还原率逐渐升高,当m(磷矿)∶m(焦炭)=100∶25、还原温度为1450℃时,磷还原率达96.5%。     

鞍钢大孤山球团厂内配碳的试验研究

以铁精矿球团为研究对象,在实验室进行了内配碳的试验研究。结果表明:添加适量固体燃料可以提高球团矿强度,降低焙烧燃耗,同时能改善球团矿的冶金性能;在备选燃料中优选出0.2%的煤粉进行内配,生球的落下强度有所提高,但是抗压强度随着配煤量的增加略有降低,而爆裂温度则变化不明显。当配煤量为0.2%时,焙烧球的强度最高。配煤量对焙烧球强度的影响比较显著,过少或过多都对强度有不利影响。在预热温度为950℃,焙烧温度为1 250℃的条件下,随着焙烧温度和预热温度的逐渐提高,抗压强度也逐渐增强。     

煤沥青和糖蜜复合型煤粘结剂的制备

针对目前型煤工艺发展状况和我国煤炭的现状提出了一种适合的粘结剂制备方案;研究了分别使用煤沥青、糖蜜作为单一粘结剂时和两者混合配比时以煤沥青粘结剂作为主要粘结剂制备型煤的试验,分析了添加糖蜜后对于煤沥青型煤强度的影响;通过SEM分析结果佐证,探讨了糖蜜作为粘结剂改善煤沥青型煤强度的机理;确定了复合型煤粘结剂的添加量为:煤沥青13%,糖蜜为2%;此时生产的型煤湿块和干块落下强度分别达到18.2次/2m、19.6次/2m,抗压强度达到10.05 MPa。     

回转窑直接还原工艺的生球预热制度

以新疆蒙库高品位磁铁精矿为原料,采用预热球团一步法煤基直接还原工艺制取铁. 考察了不同预热制度下预热球的质量,以研究预热工艺在磁铁精矿球还原中的作用效果,其中预热球的抗压强度和粉未率是衡量预热工艺作用效果的重要指标. 通过链篦机预热处理生球以提高预热球强度,有效降低干球粉末率. 由实验结果确定最佳预热制度. 在预热温度800~850℃、预热时间15~18 min、预热风速1.5~1.8 m/s、料高100 mm的预热条件下,得到的预热球团抗压强度为600 N/个以上,比其他预热制度下得到的预热球团抗压强度有较大提高. 由扩大型全流程实验可知,在该条件下得到的直接还原铁质量完全达到生产要求.     

磷矿-碳复合球团冷固结成型试验研究

为了促进磷矿-碳复合球团在黄磷生产中的应用,进行了磷矿粉-碳质还原剂冷压造球试验研究,考查了黏结剂种类及配比、原料粒度、配碳量等因素对生球性能的影响以及生球烘干过程的脱水行为和强度变化.试验结果表明:随着腐植酸钠配比从0.5％增至2.0％,落下强度和抗压强度均先升高后降低;随着膨润土配比从0.5％增至2.0％,抗压强度...     

硫酸烧渣生产氧化球团可行性的试验研究

当硫酸烧渣的铁含量提至约60%时,其可作为炼铁原料。因此,就硫酸烧渣生产炼铁用氧化球团进行了研究。研究结果表明,如果硫酸烧渣中铁含量达约60%,经几十分钟细磨后,和磁铁矿粉、添加剂混合后可满足生产氧化球团的原料要求;细磨硫酸烧渣比例<65%时,其造粒球团的各项指标能达竖炉和高炉的生产要求。烘干球平均抗压强度均在100 N以上,烘烤球平均抗压强度在120 N以上,焙烧球抗压强度均在4 000 N以上。     

镍矿渣地聚合物的制备及其增韧改性

以工业固体废渣-水淬镍渣为主要原料,在碱激发剂作用下制备地聚合物.通过加入矿渣和纤维的方法对镍渣地聚合物的力学性能进行优化,并通过孔结构测试、断面形貌分析等方法,对矿渣的增强作用和纤维的增韧作用进行研究.结果表明:矿渣的掺入有利于镍渣地聚合物抗压强度的提高和内部孔径结构的改善.50 ℃养护7 d时,与镍渣地聚合物相比,矿渣掺量为50％的镍矿渣地聚合物的抗压强度提高了209.7％,总孔隙率和最可几孔径尺寸分别降低了32.7％和53.1％.PP纤维的掺入能有效提高镍矿渣地聚合物的韧性,当纤维掺量为1.6％时,50 ℃养护7 d的镍矿渣地聚合物抗折强度和抗冲击功分别较未掺纤维试样提高了42.0％和114.3％,基体中纤维的拔出和拉断消耗了荷载能量,提高了地聚合物的抗裂能力.     

Pelletization of magnetite ore with colemanite added organic binders

A new generation binder consisting of an organic binder and a borate salt was tested as an alternative to bentonite in magnetite ore pelletization. Carboxyl methyl cellulose (CMC), Ciba DPEP06-0007 and corn starch, and calcined colemanite were used as organic binders and the borate salt, respectively. They were added to the pellet feed separately and in different combinations at several addition levels. It was found that the use of organic binders is sufficient in terms of wet pellet quality; however, they fail to render the required compressive strength to pre-heated and fired pellets. Therefore, organic binders and calcined colemanite were used together so that wet pellets, pre-heated and fired pellets would be of the required quality. The results showed that the use of an organic binder together with calcined colemanite indeed yielded pellets with equal or better wet and indurated pellet qualities compared to the pellets produced with bentonite binder alone.     

BaSO4对球团矿抗压强度的影响

以磁铁精矿粉和膨润土为原料、BaSO4为添加剂生产球团,基于直接配入法的组分调控方式,结合热重实验结果,研究了BaSO4对球团矿抗压强度的影响,并采用压汞仪、矿相显微镜和扫描电子显微镜?能谱仪等分析了球团矿焙烧过程中BaSO4对球团矿抗压强度的影响机理和钡的转变行为。结果表明,随BaSO4含量增加,预热球团抗压强度变化较小,焙烧球团抗压强度先升高后逐渐降低。BaSO4添加量小于1.5wt%时,有利于焙烧球团内部磁铁矿氧化和新生赤铁矿再结晶,孔隙率略有增加,内部氧分压提高,增强了晶粒间的固结程度,球团抗压强度提高。BaSO4含量进一步增加,球团矿内部孔隙尺寸增大,降低了内部基体的整体性,使晶粒间的连晶程度减弱,球团矿抗压强度降低。     

Microstructure and mechanical properties of ternary mortars with brick powder,glass powder,slag, fly ash,and limestone

The objective of this research is to study the effects produced by ternary binders which combine the addition of waste brick powder with fly ash, limestone, ground granulated blast furnace slag or waste glass powder in the microstructure and mechanical properties of mortars. In these ternary binders, the ordinary Portland cement was partially replaced by 10% of waste brick powder and 10% of another of the abovementioned additions. Mortars prepared with ordinary Portland cement without additions were also prepared. The microstructure was characterized with mercury intrusion porosimetry, electrical resistivity, and thermogravimetric analyses. Ultrasonic pulse velocity, compressive and flexural strengths were also determined. Mortars made using ternary binders with two active additions showed higher pore refinement and higher electrical resistivity at 250 days. Furthermore, their compressive strength and ultrasonic pulse velocity were relatively similar or even higher than that noted for reference specimens.     

高炉法生产黄磷技术前景分析

回顾高炉法生产黄磷的历程,分析指出高炉法生产黄磷未能工业化的问题在于干除尘器系统难操作、难维护。介绍降低高炉法生产黄磷炉顶煤气尘含量的措施;分析用高炉法生产黄磷的效益;介绍高炉可视化喷吹技术在黄磷生产中的应用。     

应用XRD分析水泥窑灰矿渣型生态水泥水化过程的研究

选用4种不同类型的水泥窑灰（CKD），利用XRF分析其化学成分，并将其分别与粒化高炉矿渣粉（GBFS）制成4种生态水泥。然后根据CKD-GBFS生态水泥净浆的水化产物的XRD图谱与各龄期的胶砂抗压强度研究其水化过程。结果表明：高碱度的CKD能促进水化，适量的fCaO能加快后期水化，而未反应的Ca（OH）2会降低后期抗压强度，K2Ca（SO4）2的产生会延缓水化进程。     

Fiber-reinforced one-part alkali-activated slag/ceramic binders

In the present experimental/numerical study, a combination of ceramic waste and ground-granulated blast furnace slag were used in the preparation of one-part alkali-activated binders. Moreover, the effect of fiber type and content on hardened-state properties and shrinkage was studied under two different curing conditions. In the first stage of this study water absorption, compressive strength, and flexural strength were assessed. Subsequently, the flexural performance of fiber-reinforced binders was simulated and predicted using finite element models under concentrated and distributed flexural loading, respectively. The experimental results showed that fibers improved mechanical properties, and enhancement was governed by fiber type and curing conditions. Moreover, the numerical results indicated that the developed fiber-reinforced binders offer a flexural load-carrying capacity in the range of 10–40?kN/m² and permissible service loads were well below the ultimate capacity.     

消石灰、无水石膏与石灰石粉对矿渣水泥性能的影响

通过掺加消石灰、无水石膏和石灰石粉提高矿渣水泥的早期强度、干缩等性能。研究结果表明：消石灰、无水石膏及石灰石粉可加速矿渣水化进程,并使水泥浆体密实度提高,最终体现为矿渣水泥早期抗压强度大幅度提高。复合掺加消石灰、无水石膏和石灰石粉的矿渣水泥水化早期的干缩率小于普通硅酸盐水泥,水化后期矿渣水泥的干缩率稍大于普通硅酸盐水泥,但大大小于未掺激发剂的矿渣水泥。