Electrorheological effect of Ti-bearing blast furnace slag with different TiC contents at 1500°C

The electrorheological properties of CaO–SiO2–Al2O3–MgO–TiO2–Ti C slags were investigated to enhance understanding of the effect of TiC addition on the viscosity, yield stress, and fluid pattern of Ti-bearing slags in a direct-current electric field. The viscosities and shear stresses of 4wt% and 8wt% Ti C slags were found to increase substantially with increasing electric field intensity, whereas virtually no rheological changes were observed in the 0wt% TiC slag. The Herschel–Bulkley model was applied to demonstrate that the fluid pattern of the 4wt% TiC slag was converted from that of a Newtonian fluid to that of a Bingham fluid in response to the applied electric field; and the static yield stress increased linearly with the square of the electric field intensity.

BFS固井液在吉林油田油层套管固井中的应用

水淬高炉矿渣(BFS)是炼铁厂的副产品,具有水硬性质,目前已广泛用于建筑水泥———矿渣水泥的生产。在我国,BFS大量应用于石油固井业始于20世纪90年代中期。由于用BFS配制的固井液具有密度低、密度范围可调、强度高、滤失量小、无游离水、触变性好、稠化时间可调、无体积收缩等特点,可广泛用于常规和复杂油气井固井。文章概述了BFS固井液及其性质、BFS的筛选、BFS固井液的性能、BFS固井液的配制及现场施工方法,并以吉林油田油层套管BFS固井为例,对BFS固井液的固井质量进行了阐述。实践表明,吉林油田油层套管采用BFS固井,CBL测井表明固井质量优质。

掺加BFS的乳化沥青冷再生混合料路用性能研究

为验证在乳化沥青冷再生混合料中掺加高炉矿渣(blast furnace slag, BFS)的可行性并分析掺加BFS的乳化沥青冷再生混合料的路用性能,采用直接掺加BFS和以消石灰做激发剂掺加BFS两种方案,与掺加1.5%水泥的冷再生技术方案进行对比试验。通过测试干湿劈裂强度、冻融劈裂强度、60℃动稳定度和60℃抗剪强度、单轴压缩等性能指标,最终确定了v用于乳化沥青冷再生混合料的合理利用方式。研究结果表明:干湿劈裂强度试验无法有效地反映乳化沥青冷再生混合料水稳定性差异;冻融劈裂强度试验能有效地评价其水稳定性。在乳化沥青冷再生混合料中用BFS直接替代水泥会降低混合料的水稳定性;采用1.5%BFS+0.3%消石灰激发剂后,可使混合料具备与掺加1.5%水泥基本相当的路用性能。

Status and development of mineral wool made from molten blast furnace slag

This study describes the characteristics of mineral wool and its applications,and also introduces the traditional process of mineral wool made from molten blast furnace （BF） slag. Compared with high energy consumption of the traditional process,the production of mineral wool by using molten BF slag will be able to take full advantage of the sensible heat of molten slag, and also reduce production costs. However, there are also further issues to resolve such as how to obtain the required amount of molten BF slag and how to make it homogeneous. Based on the physical and chemical properties of the molten BF slag,the investigation into the relationship between temperature and viscosity under different acidity coefficients of the slag and silicon mixture was conducted. Combined with the crystallization and phase diagram of slag wool, its heat resistance, water resistance, durability and corrosion resistance were analyzed. Finally, trends of the technology development are proposed.

Mechanisms of phosphate removal from aqueous solution by blast furnace slag and steel furnace slag

We report the adsorption of phosphate and discuss the mechanisms of phosphate removal from aqueous solution by burst furnace slag (BFS) and steel furnace slag (SFS). The results show that the adsorption of phosphate on the slag was rapid and the majority of adsorption was completed in 5~10 min. The adsorption capacity of phosphate by the slag was reduced dramatically by acid treatment. The relative contribution of adsorption to the total removal of phosphate was 26%~28%. Phosphate adsorption on BFS and SFS follows the Freundlich isotherm, with the related constants of k 6.372 and 1/n 1.739 for BFS, and of k 1.705 and 1/n 1.718 for SFS. The pH and Ca2+ concentration were decreased with the addition of phosphate, suggesting the formation of calcium phosphate precipitation. At pH 2.93 and 6.93, phosphate was desorbed by about 36%~43% and 9%~11%, respectively. These results indicate that the P adsorption on the slag is not completely reversible and that the bond between the slag particles and adsorbed phosphate is strong. The X-ray diffraction (XRD) patterns of BFS and SFS before and after phosphate adsorption verify the formation of phosphate salts (CaHPO4·2H2O) after adsorption process. We conclude that the removal of phosphate by BFS and SFS is related to the formation of phosphate calcium precipitation and the adsorption on hydroxylated oxides. The results show that BFS and SFS removed phosphate nearly 100%, indicating they are promising adsorbents for the phosphate removal in wastewater treatment and pollution control.

Research on the performance of steel slag and blast furnace slag composite admixture

This study investigates the properties of Baosteel steel slag and blast furnace （BF） slag in order to develop high-performance steel slag and BF slag composite admixture by optimizing the composite mixing technique. Based on the investigation of the stability of steel slag powder and the performance of cement mortar in different mixing ratios and different adding amounts of steel slag and BF slag composite admixture, rational mixing ratios and the adding amount range of steel slag and BF slag composite admixture were determined.

高炉炉渣处理技术及发展趋势

介绍了国内高炉炉渣处理技术现状,主要包括水渣处理中的底滤法、INBA法的现状与发展。现有高炉炉渣处理技术存在着水渣处理耗水量大、污染环境、高炉炉渣余热回收率低和需要额外能源消耗等问题。离心粒化法节约水资源、无污染物排放且能有效回收炉渣余热,是高炉炉渣处理未来的发展趋势。

高炉渣均质化行为及其粒化效果研究

利用动态黏度实验法研究了高炉渣的均质化行为,构建熔渣调质过程动力学模型,同时对高炉渣均质化状态进行验证,并对最终粒化效果进行了分析。结果表明,均质化时间随调质剂添加量增加先减少后增加,添加量为15.43%时均质化时间最短;高炉渣粒度大于1.75 mm时,均质化时间明显增加;随炉渣温度升高,均质化时间逐渐缩短,通过与充分均质化高炉渣的成分及矿相进行对比,验证了高炉渣在黏度值达到稳定时已完成了均质化。粒化渣珠粒径主要位于1~2.5 mm,基本呈正态分布;高炉渣均质化处理后非晶相含量均高于85%,满足国家标准要求。

广西翅冀钢铁矿渣微粉系统及大型立磨技术的应用和分析

在刚投产的项目中,MTP270型矿渣立磨的单机年干粉产量已经达到220万吨以上。广西翅冀钢铁有限公司的矿渣微粉系统配置了MTP270型超大型矿渣立磨,该系统在减少项目占地、降低项目投资、降低综合能耗、降低生产运行成本等方面表现突出,提高了产品的市场竞争力。本文对MTP270超大型矿渣立磨在广西翅冀钢铁钢铁有限公司矿渣微粉生产线中的应用进行了分析。

Synthesis of TiO_2 visible light catalysts with controllable crystalline phase and morphology from Ti-bearing electric arc furnace molten slag

TiO_2 visible light catalysts with different crystalline phases and morphologies were synthesized from titanium-bearing electric arc furnace molten slag（Ti-bearing EAF slag）by using a simple acidolysis process.The effects of the p H of the HCl solution,liquid to solid ratio（RL/S,HCl solution to the residue ratio,m L/g） and acidolysis time on the micro-morphology and crystalline phase of as-prepared TiO_2 photocatalysts were systematically investigated.The results indicated that with decreasing p H in the HCl solution and increasing RL/S,the crystalline phase and micro-morphology of the obtained TiO_2 nanostructures tended to transform from anatase type TiO_2 with spherical nanoparticle structures to rutile type TiO_2 with needle-like nanorod structures.The acidolysis time had little influence on the crystalline phase but great impact on the size of the obtained TiO_2.The growth mechanism of TiO_2 from Ti-bearing EAF slag during the acidolysis process was also discussed.In addition,the influence of RL/Son the photocatalytic properties of the synthesized nanostructured TiO_2 was studied.The results showed that the photodegradation efficiency for Rhodamine B solution could reach 91.00% in 120 min when the RL/Swas controlled at 50：1.

武钢铜冷却壁高炉炉墙结厚原因分析

对铜冷却壁在武钢大型高炉的应用情况进行了阐述。选取8号高炉为代表,对武钢铜冷却壁高炉炉墙结厚的过程进行跟踪分析,找出炉墙结厚的原因,并提出防止炉墙结厚、维护铜冷却壁高炉操作炉型的对策措施。边缘气流长期不足、操作制度未能适应入炉料结构变化、渣皮脱落后操作不合理是武钢铜冷却壁高炉炉墙结厚的主要原因。须通过十字测温和炉身热负荷管理办法,控制适宜的边缘气流,入炉料结构发生变化后要进行针对性调整,渣皮脱落后的煤气流控制要遵循疏通中心引导边缘的原则,才能从根源上消除铜冷却壁炉墙结厚现象,保持铜冷却壁高炉良好的操作炉型。

Separation and comprehensive utilization of valuable elements in Ti-bearing electric arc furnace molten slag

A novel route to comprehensive utilization of valuable elements such as Ti, A1, Si and Mg in Ti-bearing electric arc furnace molten slag （Ti-bearing EAF slag） was proposed. The route can be expressed as a three-step process including alkali fusion, water leaching and acidolysis. Following these processes under the optimum conditions, the recovery ratios of TiO2, Al2O3, SiO2 and MgO were about 97.5, 93.5, 27.9 and 53.5%, respectively. Meanwhile, nanostructured TiO2, NaA zeolite and Mg（OH）2 fire retardant were synthesized simultaneously by using Ti-bearing EAF slag as raw materials. In addition, the photocatalytic activity of prepared nanostructured TiO2 and the adsorption property of obtained NaA zeolite were investigated. The results showed that the photodegradation efficiency of as-prepared TiO2 was 80% for rhodamine B and the adsorption efficiency of NaA zeolite was 61% for Cu2＋ under the optimum conditions.

高炉渣急冷干式粒化处理工艺分析

介绍了3类已经进行过工业试验的急冷干式粒化方法——滚筒法、风淬法和离心粒化(转杯)法,分析了它们的优缺点。对高炉渣急冷干式粒化的节水、节能和环保效益进行了估算,同时指出了急冷干式粒化技术的难点。

含碱高炉渣排碱、脱硫能力的实验研究

为探讨高炉渣排碱、脱硫能力间的关系,根据广钢实际高炉渣成分,通过实验研究了w(CaO)/w(SiO2),w(MgO),w(Al2O3)对炉渣排碱、脱硫的影响.结果表明:w(CaO)/w(SiO2)对炉渣的排碱、脱硫能力影响较大,二者相互矛盾;w(MgO)升高,炉渣排碱能力降低,含碱炉渣最佳脱硫对应的w(MgO)比普通炉渣低3%.w(Al2O3)升高,炉渣的排碱能力变化不大,而脱硫能力迅速降低.广钢高炉适宜的炉渣成分为:w(CaO)/w(SiO2)保持在1.0,w(MgO)保持在12%,w(Al2O3)保持在15%.

高炉渣钾容量的试验研究

为降低碱金属对高炉的危害，提高炉渣的排碱能力，采用气-渣平衡法测定了1723K时高炉渣的钾容量。依据广钢实际高炉渣成分，用纯化学试剂配制炉渣，用一定组成K（g）-CO-CO2-Ar混合气体提供一定的氧分压和钾分压。研究表明：试验条件下，w（MgO）和w（Al2O3）一定时，钾容量随w（CaO）／w（SiO2）的增大而减小；在w（CaO）／w（SiO2）和w（Al2O3）一定时，钾容量随w（MgO）的增大而增大；在w（CaO）／w（SiO2）和w（MgO）一定时，钾容量随w（Al2O3）的增大而增大；当[w（CaO）Ww（MgO）]／w（SiO2）和w（Al2O3）固定不变时，增加w（MgO），降低w（CaO），钾容量明显增大。广钢炉渣的合理成分为：w（CaO）／w（SiO2）保持在1．0，w（MgO）保持在12％～15％，w（Al2O3）不超过15％。

攀钢碳化高炉渣低温氯化试验研究

对攀钢高钛型高炉渣"高温碳化—低温选择性氯化"工艺中低温选择性氯化部分进行了研究,并在自行设计的100 mm连续式沸腾氯化装置上考察了连续加料、连续排渣条件下氯化温度、停留时间、气流速度、氯气浓度对碳化渣中TiC氯化率的影响规律,并获得了较佳的工艺参数,为下一步的扩大试验奠定了基础。

不同类型含钛高炉渣主要冶金性能及物相

根据渣中TiO_2及Al_2O_3质量分数不同对高炉渣进行划分,以钒钛磁铁矿现场高炉渣为基准,采用纯化学试剂配制渣样,在中性气氛下对比研究低、中、高钛型钒钛矿高炉渣及低、中、高铝型钒钛矿高炉渣主要冶金性能。同时,运用XRD物相分析及Factsage 6.4热力学软件对各渣系主要组成物相及其变化进行分析。研究结果表明:低、中、高钛渣熔化性温度逐渐增大,初始黏度和高温黏度降低,渣系热稳定性和化学稳定性先变好后变差,渣中黄长石相骤减,辉石、钙钛矿相数量增多。低、中、高铝渣熔化性温度、初始黏度和高温黏度升高,渣系热稳定性和化学稳定性变差,渣中镁铝尖晶石等高熔点物相数量增多。

湘钢高Al_2O_3高炉渣粘度研究

对湘钢高Al2O3高炉渣的粘度进行了测试。通过改变二元碱度R和MgO的含量,探讨在高Al2O3情况下高炉渣的最优配比。实验表明,在高Al2O3下,保持高MgO,较低碱度是可行的。实验中,R=0. 95,wMgO=12%的炉渣流动性最好。

大掺量矿渣水泥砂浆碳化过程研究

矿物掺合料的引入会减少水泥砂浆内部碱性物质含量,同时其中的活性成分与氢氧化钙发生二次水化反应,进一步地减少了砂浆的碱性,从而降低了砂浆的抗碳化能力。本文通过热重-差示扫描量热试验研究了不同掺量粒化高炉矿渣引入对碳化产物和微观结构的影响。研究结果表明:喷洒酚酞指示剂显示为无色的碳化表层仍然存在少量的Ca(OH)2,这说明砂浆碳化存在部分碳化区;碳化反应物不仅包含Ca(OH)2,也包含水化硅酸钙凝胶(CSH gel),钙矾石(AFt),低硫型水化硫铝酸钙(AFm),硅酸二钙(C2S),硅酸三钙(C3S)等物质;此外,随着矿渣含量的提高,碳化速率增大,同时由于矿渣可以改善水泥浆体的孔结构,矿渣掺量在50%时,碳化速率最小。