Clay Minerals最新文献_第8页

Preparation of layered double hydroxide films using an electrodeposition and subsequent crystal growth method 用电沉积和随后的晶体生长方法制备层状双氢氧化物薄膜

IF 1.5 4区地球科学

Clay Minerals Pub Date : 2021-12-01 DOI: 10.1180/clm.2022.8

N. Sonoyama, Shizuka Yamada, T. Ota, Haruna Inagaki, Patrick K. Dedetemo, Satoshi Yoshida

引用次数: 1

Analysis of the chemical composition and phase structure of ‘Ru-type ware’ bodies under the influence of firing temperature – CORRIGENDUM 烧成温度影响下“如”型瓷体化学成分和相结构的分析-勘误表

IF 1.5 4区地球科学

Clay Minerals Pub Date : 2021-12-01 DOI: 10.1180/clm.2022.9

Bo Wu, Wei-jie Zhao

引用次数: 0

Measurement of apparent sintering activation energy for densification of clays 黏土致密化表观烧结活化能的测定

IF 1.5 4区地球科学

Clay Minerals Pub Date : 2021-12-01 DOI: 10.1180/clm.2022.11

Andrea Comin, Alexandre Zaccaron, Vítor de Souza Nandi, J. Inocente, Thuani Gesser Muller, A. D. Dal Bó, A. Bernardin, Michael Peterson

{"title":"Measurement of apparent sintering activation energy for densification of clays","authors":"Andrea Comin, Alexandre Zaccaron, Vítor de Souza Nandi, J. Inocente, Thuani Gesser Muller, A. D. Dal Bó, A. Bernardin, Michael Peterson","doi":"10.1180/clm.2022.11","DOIUrl":"https://doi.org/10.1180/clm.2022.11","url":null,"abstract":"Abstract Clays are raw materials with properties that are necessary for the manufacture of ceramic tiles. The characteristics of clay ceramic raw materials may vary within the same mineral deposit. Clay blending promotes better use of clay reserves, thereby increasing the applicability and life cycle of raw materials. Therefore, it is important to understand the mechanisms controlling the firing of ceramic tiles. In this study, three different clays from a clay deposit were assessed and ten formulations were prepared using the mixture design method. The formulations were analysed using differential thermal and thermogravimetric analyses and dilatometric analysis. Subsequently, the most refractory and fluxing formulations were subjected to thermal tests under various heating rates, similar to the process used for the calculation of apparent sintering activation energy for the densification of clays and for pyroplasticity tests. It is suggested that a mineral deposit can be assessed based on activation energy and thermal kinetics, expanding the alternatives available to the miner through the planning of mixtures with various clays and thus reducing the energy costs of the industrial process.","PeriodicalId":10311,"journal":{"name":"Clay Minerals","volume":"56 1","pages":"299 - 305"},"PeriodicalIF":1.5,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47560560","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

CLM volume 56 issue 4 Cover and Front matter CLM第56卷第4期封面和封面问题

IF 1.5 4区地球科学

Clay Minerals Pub Date : 2021-12-01 DOI: 10.1180/clm.2022.13

引用次数: 0

Enhanced alumina extraction from kaolin by thermochemical activation using charcoal 炭热化学活化法从高岭土中萃取氧化铝

IF 1.5 4区地球科学

Clay Minerals Pub Date : 2021-12-01 DOI: 10.1180/clm.2022.7

Amr B. ElDeeb, V. Brichkin, M. Bertau, M. Awad, Yulia Savinova

{"title":"Enhanced alumina extraction from kaolin by thermochemical activation using charcoal","authors":"Amr B. ElDeeb, V. Brichkin, M. Bertau, M. Awad, Yulia Savinova","doi":"10.1180/clm.2022.7","DOIUrl":"https://doi.org/10.1180/clm.2022.7","url":null,"abstract":"Abstract The present work aims to increase the alumina percentage recovery (APR) extracted from kaolin via the addition of 0.5–4.0 wt.% charcoal as a thermochemical fluxing agent in the lime-sintering process at 1260–1360°C. The transformation, microstructural and microtextural changes and self-disintegration performance were characterized using thermogravimetric analysis and differential scanning calorimetry, X-ray diffraction/X-ray fluorescence, scanning electron microscopy coupled with energy-dispersive spectroscopy and laser diffraction particle-size distribution analysis. The optimum enhancement of APR, from 77.7% to 87.40%, was obtained by sintering at 1360°C with the addition of 1.5% charcoal. With further increase of the charcoal content to 4%, the APR reduced to 75.6%. Combustion of ≤1.5% charcoal provided additional heat that amorphized the crystalline calcium aluminate into highly leachable amorphous phases with improved self-disintegration efficiency. Sintering at temperatures of >1360°C or with charcoal contents >4% led to mullite crystallization and decreased alumina leachability, thereby reducing the APR. Charcoal is a cost-effective and energy-efficient activator to increase the APR extracted from kaolin.","PeriodicalId":10311,"journal":{"name":"Clay Minerals","volume":"56 1","pages":"269 - 283"},"PeriodicalIF":1.5,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49025637","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

CLM volume 56 issue 4 Cover and Back matter CLM第56卷第4期封面和封底

IF 1.5 4区地球科学

Clay Minerals Pub Date : 2021-12-01 DOI: 10.1180/clm.2022.14

引用次数: 0

Removal of alkaline nitride from lubricating oil by modified clays 改性粘土去除润滑油中碱性氮化物的研究

IF 1.5 4区地球科学

Clay Minerals Pub Date : 2021-12-01 DOI: 10.1180/clm.2022.6

Ming-Rui Chen, Naiwang Liu, Li Shi, Xuan Meng

引用次数: 0

Esterification of naphthenic acids with various structures over tungstophosphoric acid-intercalated layer double hydroxide catalysts with various interlayer spacings 不同结构环烷酸在不同层间距的钨磷酸插层双氢氧化物催化剂上的酯化反应

IF 1.5 4区地球科学

Clay Minerals Pub Date : 2021-09-01 DOI: 10.1180/clm.2022.3

Yan Wu, Shi-Jiang He, Dongmei Li, Yang Li, Hao Wang

{"title":"Esterification of naphthenic acids with various structures over tungstophosphoric acid-intercalated layer double hydroxide catalysts with various interlayer spacings","authors":"Yan Wu, Shi-Jiang He, Dongmei Li, Yang Li, Hao Wang","doi":"10.1180/clm.2022.3","DOIUrl":"https://doi.org/10.1180/clm.2022.3","url":null,"abstract":"Abstract Tungstophosphoric acid-intercalated MgAl layer double hydroxides (LDHs) are active catalysts for removing naphthenic acids (NAs) from petroleum via esterification. Due to their active sites being in the interlayer, the interlayer spacing of LDHs might affect their activity, particularly for NAs with various structures. Herein, two tungstophosphoric acid-intercalated MgAl LDHs with various interlayer spacings (d003 = 1.46 and 1.07 nm) synthesized by varying the ion-exchange time were used as catalysts for esterification between NAs and ethylene glycol. Six NAs with various side chains and rings were used as model compounds to investigate the effects of NA structures and d003 values on the activity of LDHs. In general, NAs with large molecule sizes and steric hindrances are less reactive over the same catalyst. The LDH with a larger d003 value favours the esterification of NAs regardless of their structure, particularly NAs with large molecule sizes and steric hindrances. However, a large d003 is less effective for esterification of NAs with conjugated carboxyl groups. An enlarged interlayer space might facilitate NA molecules to access the interlayer of LDHs so as to come into contact with the catalytic sites, making this process responsible for the enhanced reactivity. The esterification kinetics of cyclohexanecarboxylic acid over these LDHs follow a first-order reaction. The activation energies for the LDHs with large and small d003 values are 26.25 and 32.18 kJ mol–1, respectively.","PeriodicalId":10311,"journal":{"name":"Clay Minerals","volume":"56 1","pages":"250 - 259"},"PeriodicalIF":1.5,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42762724","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Selection of suitable bentonite and the influence of various acids on the preparation of a special clay for the removal of trace olefins from aromatics 合适膨润土的选择及各种酸对制备芳烃中微量烯烃脱除专用粘土的影响

IF 1.5 4区地球科学

Clay Minerals Pub Date : 2021-09-01 DOI: 10.1180/clm.2021.32

H. Rouhani, F. Farhadi, Mahsa Akbari Kenari, Effat Eskandari, S. Ramakrishna

{"title":"Selection of suitable bentonite and the influence of various acids on the preparation of a special clay for the removal of trace olefins from aromatics","authors":"H. Rouhani, F. Farhadi, Mahsa Akbari Kenari, Effat Eskandari, S. Ramakrishna","doi":"10.1180/clm.2021.32","DOIUrl":"https://doi.org/10.1180/clm.2021.32","url":null,"abstract":"Abstract Acid-activated clays are inexpensive materials that are used extensively in the removal of unsaturated compounds on an industrial scale. The performance of bentonitic clays in removing these compounds relies heavily on the types of raw clays and acids used in the activation process. In this work, we report on the removal of olefins from aromatic streams by bentonitic clays activated via two different routes. After preliminary tests of four different natural clays, the best clay was selected in terms of it having high swelling index, cation-exchange capacity, specific surface area and suspension stability values. Activation was achieved with hydrochloric acid (HCl) and sulfuric acid (H2SO4), and olefin removal was evaluated after holistic clay characterization by means of X-ray diffraction, X-ray fluorescence, Brunauer–Emmett–Teller (BET) specific surface area analysis, ζ-potential analysis, Fourier-transform infrared (FTIR) spectroscopy after treatment with pyridine, scanning electron microscopy and transmission electron microscopy. The increased basal spacing, replacement of H+ with interlayer cations and retained structural stability of the clay after acid treatment contributed to the improvement of olefin removal for HCl-activated clay. The HCl-activated clay was more efficient in terms of olefin removal than its H2SO4-activated counterpart, removing up to 90% of olefin components after 40 h. Based on pyridine-FTIR spectra and quantitative measurement of the acidic properties of the samples, HCl treatment increased the total number acid sites (Brønsted and Lewis) by approximately ninefold compared to the pristine natural clay and by approximately fourfold compared to the H2SO4-activated clay.","PeriodicalId":10311,"journal":{"name":"Clay Minerals","volume":"56 1","pages":"185 - 196"},"PeriodicalIF":1.5,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46635647","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Study of chalcopyrite flotation in the presence of illite using a design of experiments approach 实验设计法研究伊利石存在下黄铜矿浮选

IF 1.5 4区地球科学

Clay Minerals Pub Date : 2021-09-01 DOI: 10.1180/clm.2021.35

H. A. Taner, V. Onen

{"title":"Study of chalcopyrite flotation in the presence of illite using a design of experiments approach","authors":"H. A. Taner, V. Onen","doi":"10.1180/clm.2021.35","DOIUrl":"https://doi.org/10.1180/clm.2021.35","url":null,"abstract":"Abstract The interaction between chalcopyrite and illite particles was analysed using ζ-potential measurements and flotation tests. Statistically designed tests were used to examine the factors controlling flotation (frother concentration, dispersant concentration, froth height, airflow rate and amount of clay). Furthermore, the significance levels of the impacts of these factors on responses (chalcopyrite grade/recovery, pyrite grade/recovery, dynamic froth stability and mean bubble diameter) were determined. Chalcopyrite and pyrite ζ-potentials were measured in the presence of illite. The addition of 15% illite to the chalcopyrite, especially between pH 11 and 12, shifted the ζ-potential values closer to that of pure illite, indicating complete surface coating of chalcopyrite with illite. In the flotation experiments, better results were obtained in terms of chalcopyrite grade at a low airflow rate and a high froth height. With increasing froth height there was a decline in the gangue mineral recovery as the residence time of the froth increased. The most significant factor increasing pyrite recovery was the amount of clay. Although illite is considered to be the least problematic clay mineral for flotation, as reported in the literature, an illite content of as low as 5% in the ore decreased chalcopyrite grade by 3.83%. While K and Na contents of 4% were detected after flotation without the addition of illite, their abundance increased to 5.7% after the addition of illite.","PeriodicalId":10311,"journal":{"name":"Clay Minerals","volume":"56 1","pages":"197 - 209"},"PeriodicalIF":1.5,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43665882","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1