Results 61 to 70 of about 245 (206)

Study on key control factors and risk assessment model of spontaneous combustion of coal gangue

Meikuang Anquan
To study the physical and chemical reaction characteristics during the spontaneous combustion process, and analyze the key controlling factors of coal gangue spontaneous combustion, industrial analyzers, elemental analyzers, sulfur content testers, coal ...
Qifan LI, Yulong ZHANG, Baibin HAN, Xin ZHANG, Shengyong HU, Chunshan ZHOU, Tong ZHANG, Yu ZHANG   +7 more
doaj   +1 more source

Mineralogical and elemental analysis of Kazakh coals from three mines: Preliminary insights from mode of occurrence to environmental impacts

Open Geosciences
This study aims to comprehensively characterize coal extracted from three active mines in northeastern Kazakhstan: Lenin, Saradyr, and Bogatyr. These mines exploit two Carboniferous coal-bearing formations, Dolyn and Karagandy.
Junussov Medet, Tarikhov Farkhad, Abildakhanov Abaidildin, Zhanaidar Dauren, Mekenbek Gulnur, Assambayeva Aizada   +5 more
doaj   +1 more source

Microbial community structure and potential functional diversity in a post-mining ecosystem of central China

Frontiers in Environmental Science
Abandoned coal mines cause severe soil degradation, water pollution, and biodiversity loss. This study characterizes microbial community dynamics across distinct microhabitats—slag-enriched soil (D-1), waterlogged sediment (W-3), and acidic wastewater (W-
Quan Xu, Donghua Tan, Jingqi Liu, Huangfeng Qiu, Yu Yang, Yu Yang   +5 more
doaj   +1 more source

Embedding Chemistry and Pharmacy Into Sustainability

Angewandte Chemie International Edition, EarlyView.
Chemistry and pharmacy provide products and processes that are indispensable for our high living standard. To understand their relationship with sustainability is important to allow them to contribute to sustainability in a sustainable manner. An integrated overview of green, circular, and sustainable chemistry and pharmacy is given and how they have t
Klaus Kümmerer
wiley   +1 more source

Study of Sulfur Purification from Bituminous Material in The Mishraq Sulfur Mine Using Acidic Sulfur Waste (Foam)

Journal of the Turkish Chemical Society Section A: Chemistry
In conclusion, the sulfur wastes obtained from chemical and thermal methods for sulfur purification in the Mashreq field has been present for decades in significant quantities, approaching two million tons, with its harmful impact on the environment. Our research focused on using a different approach by utilizing the acidic sulfur wastes (foam) as a ...
Hala Jasim, Deena Abd Al- Jawad, Thaer Hallow, Mote`a Abdulla   +3 more
openaire   +2 more sources

Mechanism of Hydrogen Sulfide Generation and Prevention Strategies in Oil and Gas Fields: A Case Study of the Sickle Bay Operation Area

Asia-Pacific Journal of Chemical Engineering, EarlyView.
ABSTRACT To address the persistent exceedance of hydrogen sulfide (H2S) concentrations and the limited effectiveness of existing treatments in the Sickle Bay oil production area, this study deeply analyzes the mechanism of H2S generation in the Sickle Bay oil production area and proposes targeted prevention and control strategies. The results show that
Bo Lei, Yao‐long Li, Bao‐ping Bai, Xiang‐de Zhang, Guan‐tao Shi, Yong‐long Xie, Chen‐xiao Hou, Cong‐Yu Ke   +7 more
wiley   +1 more source

The Effect of Demineralization on Coal Functional Group Pyrolysis: Rank‐Dependent Dual Mechanisms of Structural Reorganization and Mineral Catalysis

Asia-Pacific Journal of Chemical Engineering, EarlyView.
ABSTRACT Coal pyrolysis, as a key thermochemical conversion process, is significantly influenced by inherent minerals, yet their role across different coal ranks remains inadequately understood. This study investigates the effect of acid‐washing (demineralization) on the thermal decomposition of six functional groups (aliphatic C–H, aromatic C–H/C=C, C=
Zhiyuan Niu, Guijian Liu, Hao Yin, Yang Song, Aifang Ding   +4 more
wiley   +1 more source

Analysis of hard coal quality for narrow size fraction under 20 mm

E3S Web of Conferences, 2018
The paper presents the results of an analysis of hard coal quality diversion in narrow size fraction by using taxonomic methods. Raw material samples were collected in selected mines of Upper Silesian Industrial Region and they were classified according ...
Niedoba Tomasz, Pięta Paulina
doaj   +1 more source

Improving the Quality of “Leri” Rice Washing Waste by Different Period of Fermentation and Yeast Concentration as an Alternative Liquid Organic Fertilizer

International Journal of Agriculture System, 2015
This study aims to determine the best time of fermentation process and yeast concentration to improve the quality of “leri” (rice wahing waste). The study was conducted in the Bilibili village, Suppa Sub-District, Pinrang Regency, South Sulawesi Province
Muh. Akhsan Akib, Henny Setiawaty, Haniarti Haniarti, Sulfiah Sulfiah   +3 more
doaj   +1 more source

Characterization and Modeling of Industrial Phosphoric Acids' Rheological Behavior: Impact of Magnesium Monoxide on Viscosity

Asia-Pacific Journal of Chemical Engineering, EarlyView.
ABSTRACT This study investigates the rheological behavior of industrial phosphoric acids (H3PO4) produced at the JORF–LASFAR phosphoric plant in Morocco, with P2O5 concentrations of 18%, 29%, 42%, and 54%. Rheological measurements were performed using a rotary cylinder rheometer over a shear rate range of 1–1000 s−1.
Hamza Belbsir, Abderrahim Benzaouia, Said Kounbach, Abdelghani Laamaoui, Said Laassiri, Khalil El‐Hami, Rachid Benhida   +6 more
wiley   +1 more source