贵州天柱重晶石回转窑还原焙烧生产工艺研究

中国重晶石资源储量丰富,为科学合理利用,避免重晶石开发过程中浪费,采用?3.2 m×60 m回转窑还原焙烧处理贵州天柱重晶石,考察了焙烧温度、抛煤对重晶石还原效果的影响。结果表明,当高温区温度为1 050~1 200 ℃、窑尾温度为500~600 ℃、窑头温度为750~850 ℃、回转窑转速为0.20~0.40 r/min、处理量为15~20 t/h、吨矿耗煤为191.64 kg时,获得粗钡中硫化钡质量分数为70.5%、粗钡浸出率为91.3%的良好指标,焙烧矿石及浸出考核指标均合格,对合理利用中国储量巨大的重晶石矿资源具有重要的现实意义。     

水泥工业碳减排路径分析

介绍了目前国内的碳中和背景及发展现状,并基于水泥产业碳排放的相关数据,对该行业碳减排的方法和途径进行分析。水泥工业90%的二氧化碳排放来自熟料生产(碳酸钙分解、燃料燃烧),其余的10%来自原材料的准备和水泥制品的生成。指出发展创新减排燃烧、节能降耗技术、提高替代燃料掺烧量以及二氧化碳的捕集、封存与利用（CCUS）,是实现水泥产业碳中和的主要手段。     

CeOx-MnOx/TiO2低温SCR催化剂的制备及脱硝性能

利用超声浸渍法分别制备了MnOx/TiO2和CeOx-MnOx/TiO2低温选择性催化还原（SCR）脱硝催化剂,并对其进行了SEM、EDS、BET及XPS等表征,在此基础上,研究了催化剂的低温SCR脱硝性能,重点考察了Mn负载量及Ce/Mn摩尔比对催化剂性能的影响,结果表明：当Mn负载量为15%时,催化剂具有较高的催化活性;Ce的掺杂有利于催化剂催化活性的提升,当Ce/Mn=0.8时,其催化活性最高,在180℃时达到了97.86%。另外,Ce的掺杂有利于提升催化剂的抗硫抗水特性,但仍有待进一步提升。     

银阳极泥氯化浸出回收金工艺研究

研究了银阳极泥氯化浸出回收金工艺。实验结果显示,在盐酸1.5 mol/L、硫酸0.75 mol/L、氯化钠35 g/L、氯酸钠与银阳极泥中金的质量比mNaClO     

Studying the formation process of chromate conversion coatings on aluminium using continuous electrochemical noise resistance measurements

A unique electrochemical technique, namely continuous noise resistance calculation (CNRC), was used to obtain electrochemical kinetic information from the formation process of chromate conversion coatings (CCC) on aluminium electrodes. It was found that the noise resistance (R_n) of aluminium electrodes remained almost unchanged during electrodes' immersion in a chromate containing acidic solution where the CCC films were supposed to form rapidly. This result indicates that the formation of CCC was associated with continuous corrosion of the aluminium electrodes and that the CCC films formed on aluminium surface were not intact barrier films, but most likely porous layers. The CCCs became protective only after they were aged in the environment. Based on these findings, the formation and inhibition mechanisms of CCC have been discussed.     

Hydroxyl-and-carboxyl ligand concatenating multi-lanthanide substituted tellurotungstates and electrochemical detection of noradrenaline

Developing and exploring organic–inorganic hybrid multi-lanthanide (Ln) implanted heteropolyoxometalates (HPOMs) has bloomed into an emerging research field. In this article, two neoteric d-gluconic acids (H₆GA) concatenating multi-Ln^III implanted heteropolytungstates K₁₄H₁₀[Ln₄(H₂O)₄W₆(H₂GA)₄O₁₂(B-α-TeW₉O₃₃)₄]·60H₂O (Ln = La³⁺ (1), Pr³⁺ (2)) were obtained in acidic aqueous system. Attractively, in the polyanion structure of 1 and 2, six W^VI and four Ln^III centers are connected by four flexible H₂GA^4? ligands via carboxyl and hydroxyl groups, resulting in the heterometallic [Ln₄(H₂O)₄W₆(H₂GA)₄O₁₂]⁸⁺ cluster and then the heterometallic cluster is surrounded by four [B-α-TeW₉O₃₃]^8– segments. Electrochemical measurements for the 1@CFMCN/GCE sensor (CFMCN = carboxyl-functionalized multiwalled carbon nanotube; GCE = glass carbon electrode) demonstrate that 1@CFMCN/GCE shows benign recognition response to detecting noradrenaline (NDA). This research expands the structural diversity of Ln-implanted HPOMs and presents an electrochemical platform of recognizing NDA in the field of biosensors.     

含钼废渣冶炼钼铁的优化试验

利用含钼废料钼酸钙为原料,采用碳还原法冶炼钼铁,通过单因素分析试验及正交试验优化得出最佳的试验条件,钼酸钙加入量应低于10%,熔炼温度为1 525 ℃,保温时间为25 min,碱度为1.3。通过XRD、SEM、EDS分析得出用此方法生产得到的钼铁合金中,钼以Mo₂C、Fe₃Mo以及Fe₃Mo₃C的形式存在,渣系为二元玻璃渣系,具有与普通玻璃相似的成分系统。经测定合金中钼的回收率大于99%,钼资源回收效益可观。     

微波场中铌精矿碳热还原反应行为研究

目前铌资源的研究大多处于常规加热阶段,因为能耗高、冷中心等问题无法广泛推广。微波加热技术是一种新型加热技术,可以有效避免冷中心等问题。借助微波马弗炉将铌精矿碳热还原反应与微波加热相结合,探究还原温度、配碳比及保温时间对铌精矿金属化率的影响,以及金属颗粒的成长行为。研究结果表明,微波加热在碳热还原反应中优于常规加热,在微波加热下,还原温度为1100℃、保温30 min、配碳比为1时,金属化率达到94.84%;1000℃时NbC开始生成,1100℃时铌钛产物主要为(Ti,Nb)C,1300℃时,钛的产物主要以TiC形式存在。     

Effects of rapid solidification on the phase structures and electrochemical properties of a V3TiNi0.56Co0.14Nb0.047Ta0.047 alloy

The crystal structures and electrochemical properties of a V₃TiNi_0.56Co_0.14Nb_0.047Ta_0.047 alloy prepared by the melt-spinning method were studied. The rapidly solidified alloy consists of a major Vanadium-based solid solution phase and a secondary Ti₂Ni-based phase. The secondary phase exists between the dendritic arms of the major phase, showing a typical eutectic characteristic. With increasing cooling rate, the amount of the secondary phase decreases but the lattice parameters of both the major phase and the secondary phase show no obvious change. Because the disappearance of the catalytic effect of the secondary phase, the rapidly solidified alloy shows bad electrochemical properties except cycle stability.     

焦炭催化CO-NO反应的动力学实验研究北大核心CSCD

从高炉风口喷吹烧结烟气是一种有别于传统烟气脱硝工艺的新思路。为探究烧结烟气喷入风口后,焦炭催化CO-NO还原反应的动力学过程,实验以CO、NO气体为原料,以焦炭为催化剂,将不同流量配比的CO和NO混合气体在炉温为850~975℃时通入炉内,在出口处测量CO和NO反应后体积分数。实验结果表明,焦炭对CO还原NO反应有明显的催化作用;反应温度不变,CO和NO的流量比增大时,NO的还原率会增大;CO和NO的流量比不变,温度增大时,NO的还原率也会增大;炉温850、900、925、950、975℃时,反应速率常数分别为0.56、0.88、0.78、1.28、1.38 m^(3)/(mol·s),通过拟合动力学参数得到反应的活化能E;为84.1 kJ/mol。