Bulk metallic glass rings prepared by a modified water quenching method

Bulk metallic glass rings have the potential applications as annular gasket and active solder in special fields. The bulk metallic glass ring of ZГ41.2Ti13.8Cu12.5Ni10.0Be22.5 with the outer diameter, the inner diameter, and the thickness of 38, 36, and 5 mm, respectively, was prepared by using a special shaped quartz tube water quenching method. The mechanical properties along the whole cross section were investigated by a nanoindentation method, and no evident variation of the Young＇s modulus and hardness was found, further indicating the single amorphous structure. Amorphous ring and tube-shape parts with different dimensions can be produced by this method.

Synthesis and Characterization of High-purity Aluminum Titanate with Water Quenching Method

High-purity aluminum titanate was synthesized via a water quenching method with waste-residue in the aluminum factory and industrial TiO2 as the main raw materials, which belongs to the comprehensive utilization of solid wastes. Compared with the conventional method, it can reduce synthesis temperature, effectively inhibit decomposition and raise the content of AT; the addition of tiny silicon powder can improve the sintering and optimize the properties of AT. The crystalline phase structure and microstructure of each sample were characterized with XRD and SEM methods; the content of each crystalline phase in each sample was confirmed with Rietveld Quantification method; the properties of each sample were also tested. The experimental results showed that No. 4 is the optimum specimen, with the corresponding mass ratio of Al2O3/TiO2 to be 1.27 and the content of AT of 97.2 wt%. The addition of optimum tiny silicon powder is confirmed to be 8wt%; its corresponding bulk density is 2.63 g/cm^3, bending strength is 46.34 MPa, and the retention of one thermal vibration bending strength is 71.5%.

Pure LiFePO4 with high energy density prepared by water quenching treatment

“开火的复合真空”和熄灭的水技术在 LiFePO4 的合成被介绍阴极粉末。样品被加热在真空石英试管封上的预先分解的先锋混合物准备，走水路在 sintering 温度熄灭跟随。结果显示使用“快熄灭”的处理能成功控制最后的产品的谷物尺寸的增生并且改进它活跃材料的利用比率。样品由这种技术综合了有高可逆的分泌物特定的能力和好周期的电气化学的性能。

Effect of water quenching processing parameters on the mechanical properties of a cold-rolled C-Mn-containing steel sheet

Cold-rolled advanced high-strength steel sheets have become the material of choice for the automotive industry because of their unique attributes of high strength and balanced mechanical properties.High-hydrogen gas jet cooling and water quenching are the most commonly used ultrafast cooling technologies for producing martensite-containing high-strength steel sheets.The water quenching technology ensures the fastest industrial cooling rate of 1 000 K/s;therefore,it has the highest potential with respect to saving alloys.In this study,the water quenching of a C-Mn-containing steel sheet is simulated during continuous annealing to investigate the effect of water quenching and tempering parameters on its mechanical properties.The results reveal that at low quenching temperatures,the strength of the steel sheet decreases as the soaking temperature increases.However,at high quenching temperatures,a high soaking temperature corresponds to increased strength after quenching,regardless of whether the material was austenitized in the single austenite zone or the inter-critical zone.Therefore,a high quenching temperature always results in a high strength and a high yield ratio after quenching.Low-temperature overaging(tempering) considerably influences the yield strength and yield ratio,and the extent of this influence is correlated with the soaking temperature.

Technical optimization of LiFePO_4 preparation by water quenching treatment

A technique of combination of vacuum firing and water quenching was applied to the synthesis of LiFePO4 powder. The sample was prepared by heating the pre-decomposed precursor mixtures sealed in vacuum quartz-tube, followed by water quenching at the sintering temperature. The synthetic conditions were optimized by orthogonal experiment. The results indicate that the fast quenching treatment can avoid the overgrowth of single crystal and improve its availability ratio of active material. The sintering temperature has the greatest effect on the electrochemical performance of sample. Next is the molar ratio of Li to Fe and the sintering time, respectively. The samples prepared in the optimized technical condition has the highest reversible discharge specific capacity of 149.8 mA·h/g.

Preparation of Granulated Adsorption Material of Water-quenched Slag/rectorite Composite for Removal of Cu(Ⅱ)Ions from Copper Smelter Wastewater

The preparation of granulated adsorption material of water-quenched slag/rectorite composite and the treatment of Cu （ Ⅱ ）-containing copper smelter wastewater with the adsorption material were studied. The experimental results showed that under the conditions with the mass ratio of water-quenched slag to rectorite of 1：1, 10% additive of industrial starch （IS）, and 50% water, and a calcination temperature of 400 ℃, the granulated adsorption material prepared had a density of 1.06 kg/m^3, a porosity of 62.29%, water absorption rate of 58.82%, and compressive strength of 2.22 MPa. The efficiency of wastewater treatment was the best, whereas the rate of spallation loss was low. Under the conditions of natural pH, with the addition of the granulated adsorption material of 0.05 g/mL, a reaction time of 40 minutes, and temperature of 25 ℃, the efficiency of the granulated adsorption material for the removal of Cu （ Ⅱ ） ions from the copper smelter wastewater attained 98.2%, and the quality indexes of the wastewater after treatment conformed with the first level of integrated wastewater discharge standard （GB8978-1996）. The reclamation of the used granulated adsorption material was carried out by de-sorption of the Cu （ Ⅱ） ions from the surface with 1 mol/L sodium chloride solution. The de-sorption rate was 96.4%, and the adsorption material can be reused many times to treat copper smelter wastewater.

Fluorescence Quenching of a Novel Eu(Ⅲ) Coordination Compound for the Detection of Trace Amounts of Water： Synthesis, Structure and Photoluminescent Property

A novel luminescent coordination compound Eu（TTA）3（DEDAF）（1, TTA = 1,1,1-trifluoro-3-（2-thenoyl）acetone, DEDAF = 9,9-diethyl-4,5-diazafluoren） has been synthesized and fully characterized by infrared spectrum, elemental analysis, UV-vis spectrum, etc. X-ray single-crystal diffraction analysis reveals that compound 1 shows a mononuclear structure with the europium atom in coordinating to one DAF and three TTA ligands. The mononuclear structure units are assembled into a 3-D polymer by hydrogen bonds and π-π interactions. Photoluminescent property of 1 was investigated in detail at room temperature. Complex 1 emits strong red luminescence. However, it could be quenched even by small amount of water. The fluorescence intensity at 614 nm decreases linearly with the water content increasing（vol% in acetonitrile） in the range of 0.025~0.2% under 278 nm excitation. Thermogravimetric analysis has also been studied, which demonstrates good thermal stability of 1.

Residual Stress Improved by Water Jet Peening for A Quenched Gear

In this paper, a running cost is cheap from the thing used for harmless peening treatment to the environment, health which an influence is rare in toward processing material like heat being only water fundamentally, and economical, and the characteristics is hard to get are given. There is some research about the residual stress improvement by water-jet peening during the high-speed water. In this study, a big bubble cloud ceremony water-jet peening which dissolves the problem of the form of the applicable thing by exposing the whole of the applicable thing in the big bubble cloud as the way of dealing with peening efficiently in a short time is proposed by this research. Moreover, the uniform compression residual stress is added around the surface of the processing side, and connected with the remarkable improvement of the fatigue strength of the part. Furthermore, and safety processing is very possible, and it thinks about the thing which has possible high practical use, and writers to get rid of the problems of the way of processing it with peening until now. Water-jet peening was given by this research during high-speed water with big bubble cloud-type water toward tooth gear manufactured by SCr420H3 V2 to open the effect of water-jet peening during the high-speed water. A change was measured at the time as the sutra of the residual stress on the surface of the test settlement by the X-ray method, and the validity of this law was verified.

含铜污泥搭配发热危废协同处理及综合利用技术

本文介绍了富氧侧吹熔池熔炼炉协同处理含铜污泥和发热危废的技术,该工艺具有金属回收率高、熔炼强度大、一次能源消耗低,实现了含铜污泥的有价金属的综合回收和发热危废的无害化处理。生产实践表明:处理量10万吨/a含铜污泥和发热危废,可降低煤率约10%,节约成本770万/a,产出约4000t/a的多金属合金(其中含铜55%、含镍11.9%),为企业提质增效打开了的突破口。

水淬硅锰渣的机械粉磨特性

这是一篇矿物加工工程领域的论文。根据机械力化学原理,采用振动磨的方式对水淬硅锰渣进行粉磨,通过研究粉磨时间对水淬硅锰渣粉比表面积、粒度分布、活性评价等影响,并使用比表面积和激光粒度分析仪、XRD和SEM等表征方法对水淬硅锰渣粉的比表面积、粒径分布、难磨物相和颗粒形貌进行了探讨,同时也研究了不同粉磨时间的水淬硅锰渣粉作掺合料对地聚物抗压强度的影响。结果表明,随着粉磨时间延长,硅锰渣粒度分布逐渐左移,颗粒粒径逐步细化,石英相逐渐向无定形结构转变。从成本角度考虑,当粉磨时间为25 min、比表面积为1.8281 m^(2)/g时作粉煤灰地聚物掺合料时,28 d抗压强度可达26.79 MPa。并确定出难磨物相为直锰辉石晶体结构,以及不同的含锰物相。

熔融钒渣析晶调控高效提钒机理

基于熔融钒渣在不同冷却制度下导致钠化焙烧-水浸工艺提钒率波动大的问题,本文采用光学显微镜(OM)、X射线衍射(XRD)、扫描电镜(SEM+EDS)及电子探针(EPMA)等表征方法,研究熔融钒渣中钒的析出及钒尖晶石结晶特征对钒提取率的影响,并深入探讨了析晶调控高效提钒机理。结果表明:熔融钒渣的水淬温度对熔融钒渣中钒的析出率、钒尖晶石结晶粒度及钒渣钠化焙烧-水浸过程钒物相转化率及浸出率影响显著。在熔融钒渣降温过程中,1400~900℃为尖晶石快速成核生长期,900℃水淬后,钒基本完成从液相向尖晶石固相中的迁移,结晶相以钒铁尖晶石为主,其中钒呈均匀分散状态;900℃后,尖晶石生长变缓,并以钛铁尖晶石沿钒尖晶石边缘析出为主,尖晶石内部仍呈现钒的“中心聚集效应”。对1400℃、900℃和400℃水淬钒渣(Water-quenched vanadium slag,WQVS)分别进行钠化焙烧-水浸试验,水淬钒渣粒度小于0.15 mm,m(Na_(2)CO_(3))∶m(NaCl)∶m(WQVS)=10∶3∶100,焙烧温度为780℃,焙烧时间为200 min。将焙烧产物磨细至粒度小于0.18 mm后80℃水浸,浸出时间为45 min,钒浸出率分别为75.15%、95.09%和78.78%。这表明将熔融钒渣缓冷至900℃水淬可有效提高钠化焙烧-水浸工艺的钒提取率,并同时提高生产效率。

裂解装置一级急冷水冷却器腐蚀分析

某石化企业的裂解装置一级急冷水冷却器在运行过程中发生了腐蚀失效,为了确定其失效原因,对其进行了宏观观察,并对换热管取样进行硬度试验、化学成分分析、金相实验、扫描电镜观察、水质分析以及流速分析等表征手段。结果表明:该裂解装置的循环水流速过低,同时存在杂质和浊度偏高,导致了换热管内壁上结垢,从而形成垢下腐蚀。为解决此问题,应采取措施加大循环水的流速,同时加强循环水的处理,降低水质指标,减少杂质和浊度。

危险废物熔炼水淬渣的危险特性分析

以国内几家危险废物处置利用企业产生的熔炼水淬渣为研究对象,分析研究原料、产品和工艺流程,并通过采集100个熔炼水淬渣样品进行元素含量分析和危险特性测试,结合熔炼水淬渣的产生过程分析其危险特性的影响因素。结果表明,水淬渣的腐蚀性(pH值)7.39~10.38,浸出液中镍浓度最大占标率11.62%,其他无机元素及化合物浓度最大占标率均低于10%。原料中添加生石灰会造成水淬渣的腐蚀性(pH值)偏碱性,水淬渣浸出液中镍浓度与原料中重金属镍含量、以及焚烧过程中影响水淬渣对重金属固化效果的工艺参数的有关。

破乳抗垢剂在乙烯装置的应用

近年来乙烯装置受原料多样化影响,急冷水出现乳化问题,同时系统的苯系物残留量越来越多,导致工艺水系统出现严重聚合现象。工艺水出现聚合后不仅导致急冷单元多个换热器堵塞,严重时可能导致急冷单元停工,成为乙烯装置长周期运行的主要瓶颈之一。通过在急冷水系统使用一种新型药剂来改善水质,缓解水系统乳化和结垢问题,有效延长乙烯装置运行周期。

铅基固废资源区域分布及环境属性分析

铅基固废是含铅的固体废物,主要来源于锌、铅、铜冶炼过程和废旧铅酸蓄电池回收,含有大量有价金属,同时对环境有一定的污染,因此摸清铅基固废的来源结构、产量及区域分布显得尤为重要。本文在实地企业调研的基础上分析了锌、铅、铜主要冶炼技术及其产生的铅基固废,根据单吨精炼金属的固废产出比及精炼金属产量测算了铅基固废产量,基于锌、铅、铜产量分布描绘铅基固废的区域分布,依照铅基固废污染元素含量和铅基固废产量测算有价元素的产量,以期为铅基固废处置技术开发研究及产业布局提供基础支撑。

MTO装置急冷水系统降固措施分析与评价

针对甲醇制烯烃(MTO)装置急冷水系统运行的瓶颈问题,以某年处理180万t甲醇的MTO装置为研究对象,结合装置近三年运行数据,分析了急冷水系统固含量高的原因,并对瓶颈问题进行了定性、定量分析。通过试用急冷水高温萃取剂、采用分离技术、耦合沉降罐与地下污水池技术、应用沸腾床过滤技术,使急冷水含固质量浓度降至1 000 mg/L,实现了急冷水系统平稳运行。

提高钢丝抗拉强度稳定性的措施

抗拉强度是钢丝非常关键的一项性能指标,其是否合格关系到钢丝能否满足特定的使用要求。在批量化的现代大生产中,一条生产线能同时生产50根左右的钢丝,能否确保这几十条钢丝的强度稳定在一个确定的范围内,是一个非常值得探讨研究的课题。结合实际生产,从钢丝原材料控制、明火炉加热、水浴冷却等几个方面展开论述,探究影响钢丝强度性能稳定性的因素,提出提高钢丝强度稳定性的方法。

大冶特殊钢2号高炉长期使用水熄焦生产实践

对大冶特殊钢2号高炉长期使用水熄焦的生产实践进行了总结,针对水熄焦使用过程中水分大幅波动、质量不稳定导致的高炉荒煤气温度低、炉温波动大、锌、碱富积以及炉缸工作状态恶化等问题,通过铁前系统的协调和内部应对操作调整,确保水熄焦使用期间炉况稳定,为直供干熄焦后高炉各参数的迅速恢复创造了条件。

一体化严重事故分析程序的验证与分析

针对我国国产反应堆严重事故分析程序的发展需要,西安交通大学开发了一体化严重事故分析程序(modular severe accident analysis program,MOSAP)。为了验证MOSAP程序在再淹没期间相关模型的合理性和准确性,以QUENCH-06实验为例,利用MOSAP程序对实验进行建模,并将MOSAP程序的计算结果与实验结果以及国际通用程序的计算结果进行了对比。结果表明,对于包壳轴向温度、包壳氧化层厚度和氢气产量,MOSAP程序计算结果与实验值和国际通用程序计算结果符合良好。在计算包壳轴向温度和氧化层厚度方面,MOSAP程序计算结果优于国际通用程序计算结果。文中结论对MOSAP程序堆内模块验证和整个模块的验证具有一定的参考意义。

1#高炉配用外购焦炭生产成本分析

探讨了炼铁厂1#高炉在相同操作制度下,不同焦炭配比对高炉焦比、煤比、燃料比、返焦量的影响,并详细分析了不同焦炭配比下吨铁成本的变化,最终得出了配加价格较低的外购水熄焦高炉吨铁成本反而上升的结论。