Article
Biotechnology & Applied Microbiology
N. Kusumawati, S. H. Sumarlan, E. Zubaidah, A. K. Wardani
Summary: This study aims to isolate xylose-utilizing yeasts and analyze their fermentation activity to produce xylitol and ethanol, as well as their ability to grow in liquid hydrolysate produced from pretreated lignocellulosic biomass. Several yeast isolates were found to be able to grow on xylose as a carbon source and produce xylitol and ethanol. These isolated yeast strains have the potential to be used in the bioconversion process of lignocellulosic biomass waste.
BIORESOURCES AND BIOPROCESSING
(2023)
Article
Engineering, Chemical
Sugyeong Lee, Charlotte Gibson, Andrew Borschneck, Ahmad Ghahreman
Summary: A study was conducted to evaluate the effect of collector type on the flotation of carbonaceous matter (C-matter) from a refractory gold ore. Transformer oil was found to be an effective collector, resulting in improved gold recovery compared to kerosene. Analysis and experimental data suggest that transformer oil has promising potential for application in C-matter flotation.
MINERALS ENGINEERING
(2023)
Article
Multidisciplinary Sciences
Rafaella Lucia Martins, Luciano Fernandes de Magalhaes, Leandro Henrique Santos, Gilberto Rodrigues da Silva
Summary: This study investigates the selective flotation between xenotime and its main gangue minerals using a new collector produced from pracaxi oil. The pracaxi collector, mainly composed of oleic acid, linoleic acid, and behenic acid, showed selective adsorption onto xenotime. Microflotation tests indicated that the best condition for selective recovery of xenotime occurs at pH 9.0 with a collector concentration of 10.0 mg/L.
Review
Environmental Sciences
Ce Wang, Yuling Lu, Chao Song, Dechong Zhang, Feng Rong, Limin He
Summary: This paper summarizes and compares flotation techniques widely used in produced water treatment, and discusses the mechanism of the oil droplet-bubble interaction as well as the effects of flocculant, pH, and salinity on the flotation process. The research status of produced water treatment by air flotation is summarized, and future research directions are proposed.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Chemistry, Applied
Merve Deniz Kose, Buse Nur Tekin, Oguz Bayraktar
Summary: This study aimed to develop a new technique to stabilize bioactive volatile compounds in essential oils for enhanced stability as chemical raw materials. Through selective isolation and encapsulation by changing electrospraying parameters, inclusion complexes between beta-cyclodextrin and volatile compounds were formed. Experimental data confirmed successful isolation and encapsulation of various volatile compounds from labdanum essential oil, with an average nanoparticle size between 25-160 nm.
CARBOHYDRATE POLYMERS
(2021)
Article
Engineering, Chemical
Mehdi Zakeri Khatir, Mahmoud Abdollahy, Mohammad Reza Khalesi, Bahram Rezai
Summary: Fluorine ion was used as a chelating agent to selectively separate neodymium ion from aluminum ion. The presence of fluorine ions enhanced the selective separation of neodymium ion. However, the selectivity coefficient decreased with increasing fluorine ion concentration. The experimental results also confirmed the stronger interaction between fluorine ions and neodymium ions.
MINERALS ENGINEERING
(2022)
Article
Chemistry, Physical
Hongliang Zhang, Shangyong Lin, Zhihao Guo, Wei Sun, Chenyang Zhang
Summary: Reverse flotation desilication using anionic collector sodium oleate and activator Ca2+ is an effective method for purifying hematite. This study systematically investigated the separation mechanism of hematite and quartz, considering the effect of surface hydroxylation. Experimental results showed that the success of anionic reverse flotation of hematite relied on the activation of quartz by Ca2+ and the selective inhibition of hematite by sodium humate. The use of DFT calculations and SEM analysis confirmed the adsorption and chemisorption processes on the surfaces of quartz and hematite, respectively.
APPLIED SURFACE SCIENCE
(2023)
Article
Agriculture, Multidisciplinary
Sophia Jiyuan Zhang, Nicole Page-Zoerkler, Alienor Genevaz, Claudia Roubaty, Philippe Pollien, Melanie Bordeaux, Frederic Mestdagh, Cyril Moccand
Summary: Postharvest processing of coffee can be influenced by yeasts, which can modulate the sensory traits of the final cup of coffee. This study investigated the diversity of native coffee yeasts during dry and semidry postharvest processing of Arabica and Robusta beans in a Nicaraguan farm. Different strains of yeasts from various genera were found to generate varying volatile compounds, providing a potential platform for developing specific sensory attributes in the final cup of coffee.
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
(2023)
Article
Energy & Fuels
Hui Duan, Hong-hao Chang, Ling-xiao Gao, Yue-xian Yu, Xian-jun Lyu, Xiang-nan Zhu
Summary: This study investigated the influence of oxidation degree on the floatability and functional group composition of coal, and analyzed the feasibility of using waste engine oil as a renewable collector for fine coal flotation. FTIR analysis showed that oxidation degree had no significant effect on functional group types. However, XPS analysis indicated that with increasing oxidation degree, the content of C-C/C-H groups decreased significantly, leading to a notable decrease in floatability. The results also demonstrated that renewable collector could be successfully used for the flotation of fine coal, providing a potential alternative to eliminate the environmental threat of waste engine oil.
Article
Engineering, Chemical
Mei Li, Zhilong Liu, Bin Wang, Xin Teng, Hao Jiang
Summary: In this study, the flotation separation performance and mechanism of fluorite and calcite using a mixed anionic/cationic collector and salted water glass were investigated. The results showed that the mixed collectors had strong selectivity for the two minerals, while the salted water glass selectively inhibited the flotation of calcite. Analysis revealed that the mixed collectors had greater molecular activity and a synergistic effect compared to a single collector. This research provides insights into the separation of fluorite and calcite.
MINERALS ENGINEERING
(2022)
Review
Mining & Mineral Processing
Xiaoqin Tang, Ye Chen
Summary: This paper comprehensively reviews the influence of crystal structures on the floatability and flotation mechanism of pyrrhotite, and discusses the characteristics of different crystal structures and their interactions with minerals and reagents.
INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Chemical
Ning Sun, Guodong Wang, Peng Ge, Wei Sun, Longhua Xu, Honghu Tang, Li Wang
Summary: In this study, hydroxypropyl starch (HPS) was used as a novel depressant to improve the flotation separation efficiency of quartz from feldspar. Micro-flotation tests showed that the pulp pH played a decisive role in the flotation separation. The selective depression of feldspar using HPS as a depressant led to a higher separation efficiency, which was confirmed by bench-scale flotation tests.
MINERALS ENGINEERING
(2023)
Article
Engineering, Chemical
Yuanlin Chen, Xueyi Guo, Yanfei Chen
Summary: In this study, phytic acid (PA) was applied as a depressant for the flotation separation of smithsonite from calcite. The selective depressing effect of PA was well investigated, and it was found that the different active sites on the minerals' surfaces played a key role in the selective adsorption of PA. This research provides theoretical and practical reference for the clean flotation of smithsonite.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Engineering, Chemical
Qian Wei, Liuyang Dong, Fen Jiao, Wenqing Qin
Summary: The macro-molecular depressant sesbania gum (SG) was found to efficiently separate fluorite from calcite in flotation tests, achieving good beneficiation indices when added at pH 9. SG demonstrated stronger adsorption on the surface of calcite compared to fluorite, leading to selective inhibition of both minerals.
MINERALS ENGINEERING
(2021)
Article
Microbiology
Mariana Petkova, Petya Stefanova, Velitchka Gotcheva, Angel Angelov
Summary: Traditional sourdoughs in Bulgaria faced extinction during centralized food production, but a revival trend has led to increased demand for commercial starter cultures. This study aimed to isolate, identify, and characterize LAB and yeasts from typical Bulgarian sourdoughs for commercial use.
