Article
Construction & Building Technology
Xiao Huang, Chen Xin, Jiang-shan Li, Ping Wang, Shuai Liao, Chi Sun Poon, Qiang Xue
Summary: Barium slag, a hazardous industrial solid waste formed during the production of barium carbonate, has accumulated over 10 million tons in China and shows promise as an admixture for alkali activated slag (AAS) cement. Incorporating barium slag enhances the mechanical strength of AAS paste, improves pore structure, and reduces Na+ leaching concentration, making it a potential sustainable solution for waste recycling in cement production.
CEMENT & CONCRETE COMPOSITES
(2022)
Article
Environmental Sciences
Xiangqun Xu, Wei Wang, Chenyang Lv, Mengyu Ma, Leqi Shi, Dongyun Du, Tian C. Zhang, Honghai Shen
Summary: In this study, a solidified body (PG-S) was prepared by mechanical compression of a mixture of phosphogypsum, copper smelting slag, CaO, NaOH, and water. The resulting geopolymer material had a dense internal structure with a compressive strength of up to 21.3 MPa after curing for 28 days. The immobilization efficiency of PO(4)(3-)and F(-)reached 99.81% and 94.10% respectively, and the leaching concentration of heavy metals met the required standard. The study demonstrates the potential of utilizing phosphogypsum and copper smelting slag for resource utilization and backfill material.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Environmental Sciences
Fenghui Wu, Bangjin Chen, Guangfei Qu, Shan Liu, Chenyang Zhao, Yuanchaun Ren, Xinxin Liu
Summary: This paper introduces a highly targeted solidification and stabilization technology that effectively solidifies and stabilizes the toxic and hazardous components in phosphogypsum. The experimental results demonstrate excellent solidification and stabilization effect, meeting the requirements of relevant international standards.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Review
Environmental Sciences
Hannian Gu, Yuxin Yang, Tengfei Guo, Jianhua Xiao, Yushi Gao, Ning Wang
Summary: Barium slag is a by-product waste generated during the production of barium salts. It is classified as hazardous waste in China due to its corrosivity and toxic properties. This review provides a detailed summary of the characteristics, disposal methods, and potential utilization of barium slag, with a focus on harmless treatment and comprehensive utilization.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Environmental Sciences
Luis F. O. Silva, Diana Pinto, Marcos L. S. Oliveira, Guilherme L. Dotto
Summary: This study analyzed the real nanoparticles present on a beach in southern Brazil, emphasizing the need for public policies and projects for environmental recovery. Utilizing advanced electron microscopes, the research focused on the influence of physical-geochemical characteristics on the adsorption of hazardous elements by nanoparticles and their agglomerates. The application of advanced techniques and methods in understanding the formation and transport of nanoparticles on beaches is crucial for global waste management from plaster factories.
MARINE POLLUTION BULLETIN
(2021)
Article
Construction & Building Technology
Yingbin Wang, Li Xu, Xingyang He, Ying Su, Wenjuan Miao, Bohumir Strnadel, Xiaoping Huang
Summary: This study systematically investigated the hydration and rheological behavior of ultra-fine ground granulated blast furnace slag (activated-BFS) with carbide slag and anhydrous phosphogypsum (AG) as combined activators. The results showed that the type of BFS played a limiting role in setting time, and their rheological behavior fitted with H-B model.
CEMENT & CONCRETE COMPOSITES
(2022)
Article
Engineering, Chemical
Fenghui Wu, Minjie He, Guangfei Qu, Ting Zhang, Yuanchuan Ren, Linrui Kuang, Ping Ning, Junyan Li, Ye Liu
Summary: This paper proposes an innovative method for highly targeted solidification/stabilization of harmful substances in phosphogypsum (PG). By using lime, carbide slag, and polymers as treatment agents, this method achieves the stabilization and solidification of phosphorus, fluoride, and heavy metals. Experimental results show that this method effectively reduces the leaching concentration of harmful substances, providing a feasible pretreatment method for the harmless utilization and resource recovery of phosphogypsum.
MINERALS ENGINEERING
(2022)
Review
Food Science & Technology
Ranjitha T. K. Gracy, P. S. Sharanyakanth, Mahendran Radhakrishnan
Summary: The issue of pesticide residues above the maximum permissible limit in food is a serious concern, requiring appropriate non-thermal technologies for elimination. These novel technologies show promise in reducing pesticides, but their impact on the nutritional and sensory quality of food products needs further study.
CRITICAL REVIEWS IN FOOD SCIENCE AND NUTRITION
(2022)
Article
Construction & Building Technology
Xingyang He, Weilong Li, Jin Yang, Ying Su, Yunning Zhang, Jingyi Zeng, Fei Dai, Hongbo Tan
Summary: To improve beneficiation efficiency, ore is ground to a finer size, surpassing the fineness of cement. As a result, the cost of materials increases due to the inadequacy of ordinary cementitious materials. In this study, ground granulated blast-furnace slag (GGBS) was wet-milled to achieve a median particle size (D50) of 1.94 μm, effectively enhancing its cementing efficiency. Using this, a clinker-free cemented iron tailings backfill material with an ultra-low binder-tailing ratio of 1:12 was prepared, exhibiting a compressive strength of 3.7 MPa at 28 days, significantly higher than previous research. HPG simplifies the production of backfill materials with superior compressive strength, settling ratio, and water resistance compared to PG. Furthermore, the workability, mechanical properties, and ion leaching of the clinker-free backfill material met the specified requirements. Each cubic meter of backfill material can absorb up to 1699.92 kg/m3 of iron tailings.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Environmental
Chao-Qiang Wang, Ze-Yuan Wang, De-Ming Huang, Qi-Cong Huang, Yu Chen, Huan Zhang, Zhong-He Shui
Summary: This study investigated the physical and chemical properties of phosphogypsum (PG), a solid waste from wet-process phosphoric acid. The study found that the heavy metal content in PG varied, with As, Cd, Cr, and Hg identified as characteristic heavy metals. The valence of heavy metals in PG was also found to be related to the phosphoric acid process. The study demonstrated that As and Cr pollution in soil through PG intake posed carcinogenic risks to adults and children. The research established a comprehensive hazard prevention and control model for the utilization of PG, providing support for its sustainable and environmentally friendly usage.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
Article
Chemistry, Physical
Pengping Li, Xinxing Zhang, Mingfeng Zhong, Zhihong Fan, Jianbo Xiong, Zhijie Zhang
Summary: A new eco-friendly cementitious material with ultra-low alkalinity was prepared using industrial waste phosphogypsum, granulated ground blast slag, and sulphoaluminate cement. This material showed the remarkable characteristic of ultra-low alkalinity with pH values of less than 9 in pore solutions. It also exhibited advantages such as short setting time, low heat of hydration, high strength of cement mortar, and the ability to fix harmful substances. It has a broad application prospect in island and reef construction, river restoration, and other fields.
Article
Construction & Building Technology
Jin Yang, Jingyi Zeng, Xingyang He, Yunning Zhang, Ying Su, Hongbo Tan
Summary: Reducing or replacing cement clinker is crucial for the sustainable development of the cement industry. In this study, three types of industrial solid wastes were used to design clinker-free, high-performance ternary binders for construction applications. The experimental results showed that the treated binders had higher compressive strength than cement, with lower cost and carbon emissions.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Engineering, Chemical
Yingliang Zhao, Pinqi Wu, Jingping Qiu, Zhenbang Guo, Yansheng Tian, Xiaogang Sun, Xiaowei Gu
Summary: The study demonstrated that steel slag after thermal treatment can be used as a raw material for eco-friendly binders, and by adding appropriate amounts of MK and SF, high-performance backfill can be prepared. After 28 days of curing, CPB samples using P3 as a binder showed the highest compressive strength at a binder/tailings ratio of 1/4.
Article
Construction & Building Technology
Miaomiao Wu, Weiguo Shen, Xing Xiong, Li Zhao, Zhen Yu, Huiying Sun, Gelong Xu, Qinglin Zhao, Guiming Wang, Wengsheng Zhang
Summary: The effects of phosphogypsum (PG) on the hydration process and microstructure of alkali activated slag (AAS) pastes were investigated. Natural gypsum (NG) was used as a reference. Various measurements including isothermal calorimetry, electrical resistivity, autogenous shrinkage, and 1H nuclear magnetic resonance were used to monitor the hydration process. XRD, NMR, SEM, and mercury intrusion porosimetry (MIP) tests were employed to analyze the hydration product assemblages. The results showed that less than 10% of gypsums could retard the setting process of AAS pastes.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Environmental Sciences
Vsevolod Mymrin, Elaman K. Aibuldinov, Monica A. Avanci, Kirill Alekseev, Marco A. Argenda, Karina Q. Carvalho, Alexandre Erbs, Rodrigo E. Catai
Summary: The article presents data on new compositions of construction materials developed from industrial waste of three types of Kazakhstan enterprises, showing that these new materials meet Kazakhstan's mechanical and environmental standards with high compressive resistance and low water absorption rates.
JOURNAL OF MATERIAL CYCLES AND WASTE MANAGEMENT
(2021)
Article
Engineering, Chemical
Hannian Gu, Tengfei Guo, Hanjie Wen, Chongguang Luo, Yi Cui, Shengjiang Du, Ning Wang
MINERALS ENGINEERING
(2020)
Article
Environmental Sciences
Shicheng Ma, Hannian Gu, Zaimei Mei, Yongqiong Yang, Ning Wang
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2020)
Article
Engineering, Environmental
Yang Dai, Zhaodong Xu, Dong Hua, Hannian Gu, Ning Wang
JOURNAL OF HAZARDOUS MATERIALS
(2020)
Article
Metallurgy & Metallurgical Engineering
Li Zhu, Hannian Gu, Yongqiong Yang, Hanjie Wen, Shengjiang Du, Chongguang Luo, Ning Wang
Summary: Niobium concentrations in kaolin clay from the Late Permian sequences make it a potential resource due to its high content and wide distribution. Niobium is mainly enriched in Ti-bearing minerals, but the correlation between niobium and titanium concentrations is poor, and the occurrence modes of niobium in different forms of TiO2 minerals require further investigation.
MINING METALLURGY & EXPLORATION
(2021)
Article
Green & Sustainable Science & Technology
Yang Dai, Ning Wang, Zhaodong Xu, Hannian Gu, Mengjun Chen, Dong Hua
Summary: This study presents an unconventional acid-free salt leaching method for efficient extraction of metal elements from spent lithium-ion batteries. The method shows high leaching efficiency and offers a solution to the issues of equipment corrosion and toxic gas production.
JOURNAL OF SUSTAINABLE METALLURGY
(2022)
Review
Environmental Sciences
Hannian Gu, Yuxin Yang, Tengfei Guo, Jianhua Xiao, Yushi Gao, Ning Wang
Summary: Barium slag is a by-product waste generated during the production of barium salts. It is classified as hazardous waste in China due to its corrosivity and toxic properties. This review provides a detailed summary of the characteristics, disposal methods, and potential utilization of barium slag, with a focus on harmless treatment and comprehensive utilization.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Engineering, Chemical
Guiyong Zhou, Ning Wang, Wei Xu, Guotao Hu, Hannian Gu
Summary: In this study, selective sequential extraction and microanalysis methods were used to investigate the distribution and occurrence modes of arsenic in phosphate ore. It was found that arsenic mainly existed in carbonate minerals, oxides/hydroxides, and sulfide minerals fractions, with a small portion in the exchangeable and soluble fraction. Microanalysis revealed that iron oxides/hydroxides, rhodochrosite particles, and pyrite were the main arsenic-containing minerals. These findings provide valuable insights for developing techniques to remove arsenic from phosphate ores.
MINERALS ENGINEERING
(2023)
Article
Environmental Sciences
Yuxin Yang, Ning Wang, Hannian Gu
Summary: In this study, three different reduction processes were compared to synthesize ferrous oxalate dihydrate (FOD) catalysts. The hydroxylamine hydrochloride hydrothermal method (HA-FOD) showed faster degradation rates and higher degradation efficiencies, as well as strong cyclic stability after two recycling experiments. The submicron-sized HA-FOD catalyst can be synthesized from ferric oxalate solution using the hydroxylamine hydrochloride hydrothermal process, and it demonstrates high photo-Fenton degradation efficiency and reduced reaction time for wastewater treatment, providing a new pathway for efficient utilization of alumina waste red mud (RM).
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Metallurgy & Metallurgical Engineering
Hannian Gu, Wanyan Li, Zehai Li, Tengfei Guo, Hanjie Wen, Ning Wang
MINING METALLURGY & EXPLORATION
(2020)
Article
Chemistry, Physical
Hannian Gu, Ning Wang, Yongqiong Yang, Chengdong Zhao, Shanshan Cui
PHYSICOCHEMICAL PROBLEMS OF MINERAL PROCESSING
(2017)