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恒温热重法单颗粒煤焦燃烧动力学

化工学报 2006年第1期57卷 140-145页

作者：旷戈张济宇中国科学院山西煤炭化学研究所福州大学化学工程技术研究所福建福州350002 福州大学化学工程技术研究所

A thermogravimetric method under constant temperature replacing the beginning inert gas with burning air was established in this study for determining the combustion kinetics of single char particle. The combustion process of three types of coals, Fujian Longyan coal, Fujian Yong’an coal and Shandong coal, with diameter of 3.0—4.5 mm, in thermobalance under 900℃ was discussed using the familiar shrinking-core *** the combustion of single char approached the end, the outside and the ash layer diffusion resistances tend to be zero as the reaction resistance dominated in the total resistance of ***, at this stage the inherent oxidation reaction constant (k_R) of the above char samples were estimated by analyzing the total resistance of *** good agreement of combustion reaction rate between data determined in this study and calculated values obtained from reference in the drop tube furnace system, implied that the inherent oxidation reaction constant (k_R) determined by the thermogravimetric method under constant temperature was satisfactory and valuable. The gas diffusion through the ash layer of char particle during combustion process was discussed also. At the ash layer thickness half the char radius, the ash layer resistance in the combustion process reached a maximum value, at which the total resistance of combustion,1/K,was less than 25 s·m -1 and would be close to the reaction resistance,1/k_C,approaching the end of combustion. So the effects of gas diffusion resistance through ash layer on char combustion process could be ignored during the whole combustion process.

关键词：热重分析动力学灰层煤焦颗粒

Enhanced lithium leaching from lepidolite in continuous tubular reactor using H_(2)SO_(4)+H_(2)SiF_(6) as lixiviant

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Transactions of Nonferrous Metals Society of China 2021年第7期31卷 2165-2173页

作者： Hui GUO ge kuang Huan LI Wen-tao PEI Hai-dong WANG School of Chemical Engineering Zhengzhou UniversityZhengzhou 450001China Institute of Chemical Technologies College of Chemical EngineeringFuzhou UniversityFuzhou 350108China School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083China Western Australian School of Mines:Minerals Energy and Chemical EngineeringCurtin UniversityPerthWA 6102Australia

An acidic mixture of sulfuric and fluosilicic acid(H_(2)SO_(4)+H_(2)SiF_(6))was employed as lixiviant to enhance leaching of lithium from *** H_(2)SiF_(6) was obtained as a byproduct of anhydrous hydrofluoric acid production,aiming to provide HF *** was found that the HF molecules were the main reaction component and played a key role in strengthening the dissolution of *** factors,including mass ratio of ore/H_(2)SO_(4)/H_(2)SiF_(6),concentrations of H_(2)SO_(4) and H_(2)SiF_(6),leaching temperatures(40−80℃)and time(15−75 min),were ***,an efficient tubular reactor was employed to improve this acid leaching *** the optimal conditions(ore/H_(2)SO_(4)/H_(2)SiF_(6) mass ratio of 1:0.8:1.6,80 wt.% H_(2)SO_(4),15 wt.% H_(2)SiF_(6),80℃,15 min),97.9% of Li,96.4% of K,97.6% of Rb,96.7% of Cs and 81.4% of Al(mass fraction)were ***,a two-step thermal process was proposed to remove fluorine of leaching *** acid treatment using an acidic mixture of H_(2)SO_(4) and H_(2)SiF_(6) in a continuous tubular reactor shows potential as an alternative process to extract lithium from lepidolite.

关键词： lepidolite lithium extraction continuous tubular reactor fluosilicic acid fluorine chemical method

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三段联合法生产无水氟化铝

轻金属 2002年第3期 23-24页

作者：旷戈旷昌平福州大学化工系福建福州350002

提出三段联合法生产无水氟化铝新工艺 ,获得了含水量仅为 0 5 %,AlF3 >96 %的无水氟化铝 ,而且投资少 ,易操作 ,对原料要求不高 ,消耗低 ,特别适合对我国传统的湿法工艺改造。

关键词：氟化铝湿法脱水

黑臭水体疏浚底泥耦合生物质材料协同好氧堆肥中试

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环境工程 2024年第3期42卷 138-146页

作者：宋楚轩唐文英罗双雪旷阁张伟周乐安高阳袁雨菲孙士权长沙理工大学水利与环境工程学院长沙410114 湖南省交通运输厅交通建设造价管理站长沙410016 洞庭湖水环境治理与生态修复湖南省重点实验室长沙410114

采用不同比例的麸皮和发酵青草等生物质材料耦合黑臭水体疏浚底泥进行好氧堆肥中试试验。针对实际工程产生的疏浚底泥,探究适宜比例的调理剂投加配比。设置不同物料配比的对照组2组(CK0、CK1)、试验组5组(T1—T5)进行中试试验,通过理化... 详细信息

采用不同比例的麸皮和发酵青草等生物质材料耦合黑臭水体疏浚底泥进行好氧堆肥中试试验。针对实际工程产生的疏浚底泥,探究适宜比例的调理剂投加配比。设置不同物料配比的对照组2组(CK0、CK1)、试验组5组(T1—T5)进行中试试验,通过理化性质、种子发芽率等指标检测揭示不同原料配比对底泥好氧堆肥过程中堆肥性能的影响。结果表明:堆肥初期,含水率控制在50%左右,C/N控制在25~35,1 d后各堆体温度均超过50℃,各组高温期(温度>55℃)维持时间超过5 d,均符合HJ 1266—2022《生物质废物堆肥污染控制技术规范》标准要求。堆肥过程中,堆体升温速率和最高温度随着生物质材料添加量的增加呈递增趋势,其中T1和T2组的最高温度均超过70℃并维持24 h以上,这证明将麸皮和发酵青草2种生物质材料按适宜比例混合作为调理剂能够促进堆体快速发酵;堆肥结束后,各组挥发分含量稳定在20%~30%,含水率为7%~16%,pH值为8.15~8.30,各组种子发芽指数(GI)均>140%。其中,T2组固氮作用最显著、堆肥品质最优。因此,在实际生产中,按m(疏浚底泥)∶m(发酵青草)∶m(麸皮)=400∶125∶125进行好氧发酵堆肥,可显著降低物料生物毒性并产生高肥效种植土。

关键词：疏浚底泥好氧堆肥种植土生物质材料资源化利用

Design and Development of a High Efficiency Carbon- Granular Bed Filter in Industrial Scale

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Chinese Journal of Chemical Engineering 2004年第3期12卷 395-400页

作者：张济宇旷戈林诚 Institute of Chemical Engineering and Technology Fuzhou University Fuzhou 350002 China Institute of Chemical Engineering and Technology Fuzhou University Fuzhou 350002 Chinahe new dust removal technical route using the carbon-granular bed filter packed of carbon particles with appropriate grade derive from an online-process vibration sieve to replace the traditional baggy filter had been developed successfully for capturing the micro-carbon dusts produced from pulverization of petroleum coke and the green close loop of carbon materials is thus completed in the combined pulverizing and classifying system and pulverized carbon dust removal process. The high dust removal efficiency greater than 99% low outlet dust concentration less than 100mg.m-3 low pressure drop through dust filtration chamber less than 980Pa simple and easy design and flexible and stable operation were achieved also with the carbon-granular bed filter in both bench and industrial scale operations.

The new dust removal technical route using the carbon-granular bed filter, packed of carbon particles with appropriate grade derive from an online-process vibration sieve, to replace the traditional baggy filter had been developed successfully for capturing the micro-carbon dusts produced from pulverization of petroleum coke, and the green close loop of carbon materials is thus completed in the combined pulverizing and classifying system and pulverized carbon dust removal process. The high dust removal efficiency greater than 99%, low outlet dust concentration less than 100mg·m-3, low pressure drop through dust filtration chamber less than 980Pa, simple and easy design, and flexible and stable operation were achieved also with the carbon-granular bed filter in both bench and industrial scale operations.

关键词： carbon-granular bed dust removal outlet dust concentration pressure drop

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煤颗粒燃烧灰层厚度对燃烧过程的影响

燃烧科学与技术 2006年第2期12卷 186-191页

作者：旷戈张济宇林诚中国科学院山西煤炭化学研究所福州大学化学工程技术研究所福州350002

在恒温条件下利用热重分析研究了单颗粒煤焦燃烧过程灰层厚度对反应动力学的影响并建立了模型．分别对福建龙岩煤、福建永安煤以及山东煤3种煤的单个颗粒(颗粒直径3．0-4．5 mm)在900℃热天平中的反应动力学进行了分析,讨论了灰层厚度... 详细信息

在恒温条件下利用热重分析研究了单颗粒煤焦燃烧过程灰层厚度对反应动力学的影响并建立了模型．分别对福建龙岩煤、福建永安煤以及山东煤3种煤的单个颗粒(颗粒直径3．0-4．5 mm)在900℃热天平中的反应动力学进行了分析,讨论了灰层厚度对单颗粒燃烧过程的影响．单颗粒煤焦燃烧过程产生的灰层在灰层厚度为颗粒半径的一半时对燃烧过程的阻力达到最大．实验分析表明,灰层对煤颗粒燃烧过程的影响很小,3种煤焦的单颗粒燃烧过程灰层的最大阻力(1／kC)max(灰层厚度δ=R0／2-0．8-1．0 mm时)一般都小于10s/m．

关键词：热重分析灰层煤颗粒动力学

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紫金铜尾矿中明矾石直接加压酸浸

中国有色金属学报 2016年第11期26卷 2412-2419页

作者：旷戈胡松蔡洋洋李欢福州大学石油化工学院化学工程技术研究所福州350108

为解决传统明矾石提钾、铝研究一直存在的大规模产业化过程复杂、高成本等难题,以紫金矿业选铜尾矿浮选得到的明矾石为原料,首次提出采用硫酸直接加压酸浸新工艺,在明矾石未经过煅烧情况下铝、钾的浸出率可以分别达到98.54%、95.73%,远... 详细信息

为解决传统明矾石提钾、铝研究一直存在的大规模产业化过程复杂、高成本等难题,以紫金矿业选铜尾矿浮选得到的明矾石为原料,首次提出采用硫酸直接加压酸浸新工艺,在明矾石未经过煅烧情况下铝、钾的浸出率可以分别达到98.54%、95.73%,远高于常压浸出效果,而且工艺过程简单,提取成本低,反应过程较佳的工艺参数为:温度220℃、酸矿比(g/g)为3:1、酸含量为25%(质量分数)、反应时间120 min、搅拌速率为600 r/min。通过X射线衍射和扫描电镜的分析表明:明矾石结构被充分破坏,浸出渣的主要成分为SiO_2。

关键词：尾矿明矾石综合利用加压酸浸浸出率

Kinetics of leaching lithium from α-spodumene in enhanced acid treatment using HF/H_2SO_4 as medium

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Transactions of Nonferrous Metals Society of China 2019年第2期29卷 407-415页

作者： Hui GUO Hai-zhao YU An-an ZHOU Meng-hua Lü Qiao WANG ge kuang Hai-dong WANG School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083China Institute of Chemical Technologies College of Chemical EngineeringFuzhou UniversityFuzhou 350108China

An enhanced leaching of Li fromα-spodumene was carried out using a mixture of hydrofluoric and sulfuric acid(HF/H2SO4)as the *** on the optimized leaching conditions,the leaching kinetics of Li was investigated in an ore/HF/H2SO4 ratio of 1:3:2 g:mL:mL with leaching temperature ranging from 50 to 100°*** results indicate that the leaching kinetics of Li fitted well with a model based on the shrinking core *** addition,the leaching rate of Li was controlled by chemical reactions and diffusion through the product *** apparent activation energy Ea was calculated to be 32.68 kJ/*** films were formed because of the generation of insoluble products such as cryolithionite(Na3Li2Al2F12),cryolite(Na3AlF6),calcium fluoride(CaF2),potassium cryolite(K2AlF5),aluminum fluoride(AlF3),and fluorosilicates(Na2SiF6 or KNaSiF6).Furthermore,the effects of the ore/HF ratio and leaching temperature on the leaching behavior of Li,Al and Si were *** results indicate that the ore/HF ratio and leaching temperature could clearly affect the distribution of HF molecules on the leaching of Li,Al and Si,which are important for the selective leaching of Li over Al and Si with this fluorine-based chemical method.

关键词： α-spodumene lithium extraction leaching kinetics hydrofluoric acid fluorine-based chemical method

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单颗粒煤焦燃烧反应动力学研究方法

化工学报 2009年第6期60卷 1442-1451页

作者：尧志辉旷戈林诚张蒙福州大学化学化工学院福建福州350002

采用热天平研究了福建龙岩和加福的两种煤焦的单颗粒燃烧过程。探讨其燃烧过程中的气体扩散、灰层以及反应阻力的影响,建立了单颗粒煤焦燃烧过程分析方法,并由此建立了单颗粒煤焦热天平测定化学反应本征动力学常数的新方法。研究发现,... 详细信息

采用热天平研究了福建龙岩和加福的两种煤焦的单颗粒燃烧过程。探讨其燃烧过程中的气体扩散、灰层以及反应阻力的影响,建立了单颗粒煤焦燃烧过程分析方法,并由此建立了单颗粒煤焦热天平测定化学反应本征动力学常数的新方法。研究发现,随着单颗粒煤焦燃烧的进行,燃烧总阻力逐渐减小,当反应趋于结束时,燃烧阻力不再随反应时间变化,而是趋于稳定,此时燃烧阻力即为化学反应本征动力学的阻力,由此测定化学反应本征动力学常数。通过对不同温度、不同粒径煤焦以及不同空气流量下的实验与分析,表明该测定方法稳定性好,且测得的煤焦燃烧本征动力学常数和活化能与文献报道一致。

关键词：等温热重法单颗粒煤焦本征反应速率常数