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< Page ,Total 61 >
Effect of natural carbonation on the phase composition and microstructure of natural hydraulic lime-based materials modified by metakaolin SCIE
期刊论文 | 2024 | JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
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Abstract :

The issue of slow early setting and strength development is a common problem faced by natural hydraulic lime (NHL) in both historic building restoration projects and modern construction. This study aims to reveal the phase composition and microstructure of natural hydraulic lime-based materials modified by metakaolin and its effect by natural carbonation. The results demonstrate that metakaolin could promote the setting times of NHL and generally exhibit a significant enhancement effect on the mechanical strength. Additionally, the drying shrinkage of NHL mortar can be effectively reduced by adding 10% metakaolin. In terms of hydration products, C(4)ACH(11) and C-S-H are identified as primary products during the early stages for M-NHL mortars, along with other hydration products such as C-A-(S)-H being formed later on. At longer ages, the carbonation reactions occur primarily with C-S-H and C-A-(S)-H phases, while decomposition or transformation into other phases is more likely for C(4)ACH(11). Interestingly, when M-NHL mortars with 10% metakaolin, it not only promotes early hydration but also enhances long-term carbonation processes. The carbon dioxide uptake effect (similar to 20% mass %) is also found significant, and the low carbon effect in the whole life cycle means that M-NHL is environmental friendly materials. The pozzolanic effect induced by metakaolin reduces macropores and refines pore size within M-NHL system, which helps maintain high pore connectivity coefficient as well as effective porosity and more effective pathways conducive to inward transportation of CO2 gas, thereby promoting the carbonation process.

Keyword :

Natural hydraulic lime Natural hydraulic lime Microporous structure Microporous structure Metakaolin Metakaolin Natural carbonation Natural carbonation Hydration product Hydration product

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GB/T 7714 Zhang, Dajiang , Wang, Yali , Xu, Dong et al. Effect of natural carbonation on the phase composition and microstructure of natural hydraulic lime-based materials modified by metakaolin [J]. | JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY , 2024 .
MLA Zhang, Dajiang et al. "Effect of natural carbonation on the phase composition and microstructure of natural hydraulic lime-based materials modified by metakaolin" . | JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY (2024) .
APA Zhang, Dajiang , Wang, Yali , Xu, Dong , Cui, Suping , Wang, Dongmin . Effect of natural carbonation on the phase composition and microstructure of natural hydraulic lime-based materials modified by metakaolin . | JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY , 2024 .
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Modification to Enhance Surface Acidity and Reactive Species of Coal Fly Ash: A Study of Efficient NOX Removal SCIE
期刊论文 | 2024 , 12 (25) , 9351-9360 | ACS SUSTAINABLE CHEMISTRY & ENGINEERING
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This paper presents a method for efficiently removing nitrogen oxides produced during cement production by utilizing coal fly ash, a common substitute in cement raw materials. The surface acidity and reactive species content of coal fly ash were improved by acid-base modification to participate in the cement production process for efficient NOX removal. In this work, the activity of modified coal fly ash in the denitration reaction and the adsorption and reaction mechanism of NH3+NO+O-2 on its surface were explored. The research results show that the NO conversion of modified coal fly ash reaches more than 94% in the range of 800-1000 degree celsius. The modification process of base activation and acid precipitation promoted the formation of pores and the exposure of active components on the surface of the coal fly ash, increasing the number of acidic sites and oxygen vacancies. The DRIFTS results indicated that NH3 and NO were coadsorbed on the modified coal fly ash, formed active intermediates, and eventually decomposed into N-2, achieving the high efficiency of NOX removal. This study provides an efficient method to remove NOX from cement production using modified coal fly ash, which gives a new idea for low-carbon cement production.

Keyword :

reaction mechanism reaction mechanism adsorption adsorption NOX removal NOX removal coal fly ash coal fly ash SNCR SNCR

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GB/T 7714 Meng, Lingqin , Cui, Suping , Wang, Yali et al. Modification to Enhance Surface Acidity and Reactive Species of Coal Fly Ash: A Study of Efficient NOX Removal [J]. | ACS SUSTAINABLE CHEMISTRY & ENGINEERING , 2024 , 12 (25) : 9351-9360 .
MLA Meng, Lingqin et al. "Modification to Enhance Surface Acidity and Reactive Species of Coal Fly Ash: A Study of Efficient NOX Removal" . | ACS SUSTAINABLE CHEMISTRY & ENGINEERING 12 . 25 (2024) : 9351-9360 .
APA Meng, Lingqin , Cui, Suping , Wang, Yali , Zhang, Duan , Ma, Xiaoyu . Modification to Enhance Surface Acidity and Reactive Species of Coal Fly Ash: A Study of Efficient NOX Removal . | ACS SUSTAINABLE CHEMISTRY & ENGINEERING , 2024 , 12 (25) , 9351-9360 .
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Cu离子分子筛催化材料在去除NO_(x)方面应用的研究进展
期刊论文 | 2024 , (02) , 1-18 | 材料导报
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Abstract :

控制大气中的氮氧化物的排放对环境和健康有着至关重要的作用,应用于NO_(x)去除的技术有很多,其中选择性催化还原技术(NH_(3)-SCR)是去除NO_(x)最有效的技术之一,利用CO去除NO_(x)为烟气脱硝提供了一种简单且低成本的技术(CO-SCR),直接催化分解NO被认为是去除NO_(x)最理想、最环保的技术。Cu离子分子筛作为去除NO_(x)的高效催化剂,具有宽温度窗口和良好的水热稳定性。本文综述了Cu交换分子筛在去除NO领域的研究进展,讨论了Cu离子分子筛在NH_(3)-SCR、CO-SCR以及直接催化分解NO中的应用,着重总结了Cu离子参与去除NO的反应机理,归纳了分子筛中Cu活性位点对性能的影响。此外,还讨论了铜离子分子筛的抗H_(2)O和SO_(2)中毒性能。展望了Cu离子分子筛未来可能的发展方向。

Keyword :

Cu离子分子筛 Cu离子分子筛 NH_(3)-SCR NH_(3)-SCR NO直接分解 NO直接分解 CO-SCR CO-SCR NO_(x)去除 NO_(x)去除

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GB/T 7714 孟令钦 , 崔素萍 , 甘延玲 et al. Cu离子分子筛催化材料在去除NO_(x)方面应用的研究进展 [J]. | 材料导报 , 2024 , (02) : 1-18 .
MLA 孟令钦 et al. "Cu离子分子筛催化材料在去除NO_(x)方面应用的研究进展" . | 材料导报 02 (2024) : 1-18 .
APA 孟令钦 , 崔素萍 , 甘延玲 , 王亚丽 , 马晓宇 . Cu离子分子筛催化材料在去除NO_(x)方面应用的研究进展 . | 材料导报 , 2024 , (02) , 1-18 .
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一种钢渣活性激发剂及其制备方法与应用 incoPat
专利 | 2023-01-29 | CN202310044236.4
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本发明涉及建筑材料外加剂领域,尤其是涉及一种钢渣活性激发剂及其制备方法与应用,通过以氨基酸、葡萄糖和有机溶剂为原料合成一种富含更多络合基团的糖胺,并调整与醇胺和无机盐的比例组成一种钢渣活性激发剂,对于提高转炉钢渣在建材领域中的应用有着积极的促进作用。

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GB/T 7714 王剑锋 , 周永芳 , 常磊 et al. 一种钢渣活性激发剂及其制备方法与应用 : CN202310044236.4[P]. | 2023-01-29 .
MLA 王剑锋 et al. "一种钢渣活性激发剂及其制备方法与应用" : CN202310044236.4. | 2023-01-29 .
APA 王剑锋 , 周永芳 , 常磊 , 刘辉 , 刘晓 , 马晓宇 et al. 一种钢渣活性激发剂及其制备方法与应用 : CN202310044236.4. | 2023-01-29 .
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矿物极化效应影响下MnO_x/TiO_2催化剂SCR活性(英文)
期刊论文 | 2023 , 51 (01) , 194-203 | 硅酸盐学报
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Abstract :

MnO_x/TiO_2催化剂的低温脱硝活性和稳定性是目前具有挑战性的研究方向。采用矿物极化效应对MnO_x/TiO_2催化剂进行了改性研究。适当细度的电气石对催化材料的脱硝性能有明显的改善,在较宽的温度范围内脱硝效率保持在90%以上,并延长了较高脱硝效率的持续时间。原位漫反射红外光谱分析结果表明,改性前后的催化剂遵循Langmuir–Hinshelwood机理,电气石极化可以加快反应气体的吸附速率,生成易于参与到后续反应的中间产物,从而提高脱硝性能。

Keyword :

Langmuir–Hinshelwood机理 Langmuir–Hinshelwood机理 矿物极化效应 矿物极化效应 催化剂 催化剂 原位漫反射红外光谱 原位漫反射红外光谱

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GB/T 7714 赫连一哲 , 崔素萍 , 马晓宇 et al. 矿物极化效应影响下MnO_x/TiO_2催化剂SCR活性(英文) [J]. | 硅酸盐学报 , 2023 , 51 (01) : 194-203 .
MLA 赫连一哲 et al. "矿物极化效应影响下MnO_x/TiO_2催化剂SCR活性(英文)" . | 硅酸盐学报 51 . 01 (2023) : 194-203 .
APA 赫连一哲 , 崔素萍 , 马晓宇 , 王亚丽 , 徐海英 . 矿物极化效应影响下MnO_x/TiO_2催化剂SCR活性(英文) . | 硅酸盐学报 , 2023 , 51 (01) , 194-203 .
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Synergistic Effect and Mechanism of Nano-C-S-H Seed and Calcium Sulfoaluminate Cement on the Early Mechanical Properties of Portland Cement SCIE
期刊论文 | 2023 , 16 (4) | MATERIALS
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The combined utilization of mineral accelerators and nano-seeding materials is a novel method to promote the early strength of cement-based materials. In this paper, the effects of nano-C-S-H seed (NCS) on the early compressive strength of the Portland cement (PC)- calcium sulfoaluminate cement (CSA) binder were investigated. The results showed that NCS and CSA synergistically contributed to the early strength of PC. In detail, a 326.3% increase in the 10 h compressive strength of PC paste was obtained through the addition of NCS (2 wt%) and CSA (5%) in common. This was higher than the sum of the increases observed with the single additions of CSA (157.9%) or NCS (87.6%), with the same above dosage, in PC. Meanwhile, the early strength enhancement effects of NCS and CSA, when used together in PC, lasted longer than the effects of either used alone. Moreover, the synergetic effect mechanism was analyzed by isothermal calorimeter, QXRD, TGA, MIP, and SEM techniques. The calorimetry, XRD, and TGA results demonstrated that the synergistic mechanism was associated with the synergistic promotion effects of CSA and NCS on the hydrates. The fast hydration of CSA produced large amounts of ettringite and also consumed partial free water to promote the performance of the seeding effect of NCS which, simultaneously, further accelerated the precipitation of C-S-H gel and CH. The high alkie environment was also beneficial for the continuous generation of ettringite. In addition, the results of MIP and SEM measurements showed that the micro-filling effect of NCS significantly optimized the pore structure of a PC-CSA blend-hardened paste. Thus, the synergistic strength enhancement effects of CSA and NCS on PC were attributed to the matching of the promotion of hydration generation and the optimization of pore structures in hardening cement paste. The results of this article provide a new approach to achieving the rapid development of the early strength of cementitious materials, with potential applications in precast concrete and low-temperature construction.

Keyword :

ettringite ettringite calcium sulfoaluminate cement calcium sulfoaluminate cement nano-C-S-H seed nano-C-S-H seed early strength early strength synergistic effect synergistic effect

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GB/T 7714 Tang, Ruifeng , Sun, Dawei , Wang, Zhaojia et al. Synergistic Effect and Mechanism of Nano-C-S-H Seed and Calcium Sulfoaluminate Cement on the Early Mechanical Properties of Portland Cement [J]. | MATERIALS , 2023 , 16 (4) .
MLA Tang, Ruifeng et al. "Synergistic Effect and Mechanism of Nano-C-S-H Seed and Calcium Sulfoaluminate Cement on the Early Mechanical Properties of Portland Cement" . | MATERIALS 16 . 4 (2023) .
APA Tang, Ruifeng , Sun, Dawei , Wang, Zhaojia , Wang, Ziming , Cui, Suping , Ma, Wenxu et al. Synergistic Effect and Mechanism of Nano-C-S-H Seed and Calcium Sulfoaluminate Cement on the Early Mechanical Properties of Portland Cement . | MATERIALS , 2023 , 16 (4) .
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C-S-H纳米晶种及其对水泥水化硬化的促进作用综述
期刊论文 | 2023 , 37 (09) , 109-124 | 材料导报
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近些年来的研究发现,将一些纳米粒子加入到水泥中,可以为水化产物提供更多形核位点,降低水化产物的形核势垒,加快水泥的水化进程。这些纳米材料包括纳米SiO_2、纳米CaCO_3、纳米TiO_2、碳纳米管、纳米水化硅酸钙(C-S-H)等。其中,人工合成的纳米C-S-H晶种与水泥水化产物C-S-H凝胶具有相似的化学组成,是C-S-H凝胶的良好的形核基质,在众多晶种材料中,对水泥水化的加速作用最为显著,成为近年来的研究热点。到目前为止,众多学者围绕C-S-H微/纳米材料的成核方式、制备方法及对水泥水化的促进机理进行了大量研究,发现采用共沉淀法在聚合物存在的条件下制备的纳米C-S-H晶种成核剂遵循非经典成核方式,其具有纳米级的晶粒尺寸和良好的分散稳定性。将纳米C-S-H晶种以一定掺量加入到水泥中,可以充当水泥水化产物C-S-H凝胶的额外成核位点,极大地降低了C-S-H凝胶的成核势垒,有效地促进了水泥水化速率和早期强度的发展,尤其可以显著提升水泥1 d龄期以内的强度。与常用的早强剂相比,这种纳米C-S-H晶种成核剂除具有掺量低、早强效果好、对水泥混凝土耐久性无不利影响的优点外,还可以在一定程度上弥补辅助性胶凝材料(SCMs)早期强度增长缓慢的问题。因此,纳米C-S-H晶种在低温施工、滑模施工、预制混凝土制品生产等对早期强度要求较高的工程中具有良好的应用前景,有潜力成为水泥混凝土的新型早强剂。本文尝试对众多研究成果进行总结分析,从纳米C-S-H晶种的成核方式、制备方法、与聚合物的作用机理以及对水泥水化过程的影响等方面进行综述,在明确现有的规律和成果的基础上,分析了目前存在的不足,得出尚待继续研究的问题,以期为未来纳米C-S-H晶种的科学研究、工程应用提供理论基础和发展方向。

Keyword :

成核方式 成核方式 纳米水化硅酸钙 纳米水化硅酸钙 晶种 晶种 早期强度 早期强度 水化 水化

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GB/T 7714 唐芮枫 , 张佳乐 , 王子明 et al. C-S-H纳米晶种及其对水泥水化硬化的促进作用综述 [J]. | 材料导报 , 2023 , 37 (09) : 109-124 .
MLA 唐芮枫 et al. "C-S-H纳米晶种及其对水泥水化硬化的促进作用综述" . | 材料导报 37 . 09 (2023) : 109-124 .
APA 唐芮枫 , 张佳乐 , 王子明 , 崔素萍 , 王肇嘉 , 兰明章 . C-S-H纳米晶种及其对水泥水化硬化的促进作用综述 . | 材料导报 , 2023 , 37 (09) , 109-124 .
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三乙醇胺对液体无碱速凝剂“促-抑”水泥早期水化的调控机理研究
期刊论文 | 2023 , (09) , 1-15 | 材料导报
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Abstract :

<正>三乙醇胺(TEA)作为水泥混凝土中常用的早强组分,对早期强度发展有显著的促进作用。近年来随着喷射混凝土和液体无碱速凝剂的快速发展,三乙醇胺以其优良的早强特性逐渐得到广泛应用。然而,不同条件下由三乙醇胺

Keyword :

早期强度 早期强度 凝结时间 凝结时间 三乙醇胺 三乙醇胺 水化 水化 速凝剂 速凝剂

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GB/T 7714 刘晓 , 谢辉 , 罗奇峰 et al. 三乙醇胺对液体无碱速凝剂“促-抑”水泥早期水化的调控机理研究 [J]. | 材料导报 , 2023 , (09) : 1-15 .
MLA 刘晓 et al. "三乙醇胺对液体无碱速凝剂“促-抑”水泥早期水化的调控机理研究" . | 材料导报 09 (2023) : 1-15 .
APA 刘晓 , 谢辉 , 罗奇峰 , 王子明 , 崔素萍 , 夏春蕾 . 三乙醇胺对液体无碱速凝剂“促-抑”水泥早期水化的调控机理研究 . | 材料导报 , 2023 , (09) , 1-15 .
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钢渣内部金属氧化物调控提高干法脱硫性能研究
期刊论文 | 2023 , (08) , 1-10 | 材料导报
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Abstract :

钢渣的化学组成中含有大量碱金属氧化物,使其具有作为烟气脱硫剂的潜力,将钢渣改性处理用于烟气干法脱硫对于生态环境保护和资源节约有深远意义。本文从调控金属氧化物组成的角度对钢渣进行改性,提高其脱硫性能。首先通过实验证实了钢渣的化学组成中主要金属氧化物Fe_(2)O_(3)、Al_(2)O_(3)、MgO、MnO对CaO及钢渣干法脱硫的促进作用,而后通过酸、碱处理调控钢渣主要金属氧化物的组成,提升脱硫性能。并通过XRF、XRD、XPS、SO_(2)-TPD等测试方法研究了脱硫性能提升的原因。实验表明:改性后,部分以固熔体相等结构存在的金属离子分离转化为金属氧化物,钢渣表面晶格氧、吸附氧含量增多,且晶...

Keyword :

金属氧化物 金属氧化物 改性 改性 钢渣 钢渣 晶格氧 晶格氧 吸附氧 吸附氧 烟气干法脱硫 烟气干法脱硫

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GB/T 7714 王歆銘 , 马晓宇 , 崔素萍 et al. 钢渣内部金属氧化物调控提高干法脱硫性能研究 [J]. | 材料导报 , 2023 , (08) : 1-10 .
MLA 王歆銘 et al. "钢渣内部金属氧化物调控提高干法脱硫性能研究" . | 材料导报 08 (2023) : 1-10 .
APA 王歆銘 , 马晓宇 , 崔素萍 , 王剑锋 , 王亚丽 , 马骥堃 . 钢渣内部金属氧化物调控提高干法脱硫性能研究 . | 材料导报 , 2023 , (08) , 1-10 .
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面向硫化镍火法冶炼的碳排放核算
期刊论文 | 2023 , PageCount-页数: 3 (08) , 23-25 | 当代化工研究
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Abstract :

本文针对镍火法冶金流程的碳排放开展研究,利用生命周期评价方法,对比分析了硫化镍火法冶金系统各生产流程的温室气体排放当量。研究结果显示,闪速炉熔炼流程的能耗与碳排放在生产系统总能耗与总碳排放中的占比最高,分别为32.83%和22.96%;熔炼流程和浮磨分离流程的燃料替代技术是控制金属镍生产碳排放强度的关键技术。

Keyword :

碳排放 碳排放 冶金 冶金 生命周期评价 生命周期评价

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GB/T 7714 张端 , 崔素萍 , 孙博学 et al. 面向硫化镍火法冶炼的碳排放核算 [J]. | 当代化工研究 , 2023 , PageCount-页数: 3 (08) : 23-25 .
MLA 张端 et al. "面向硫化镍火法冶炼的碳排放核算" . | 当代化工研究 PageCount-页数: 3 . 08 (2023) : 23-25 .
APA 张端 , 崔素萍 , 孙博学 , 孟令钦 , 那百川 . 面向硫化镍火法冶炼的碳排放核算 . | 当代化工研究 , 2023 , PageCount-页数: 3 (08) , 23-25 .
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