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STUDY ON GREY FORECASTING MODEL OF COPPER extraction rate WITH BIOLEACHING OF PRIMARY SULFIDE ORE

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Acta Metallurgica Sinica(English Letters) 2007年第2期20卷 117-128页

作者： A.X. Wu Y. Xi B.H. Yang X.S. Chen H.C. Jiang Civil ＆ Engineering School University of Science and Technology Beijing Beijing 100083 China China Nonferrous Engineering and Research Institute Beijing 100038 China School of Resources ＆ Safety Central South University Changsha 410083 China

A model GM （grey model）（1,1） for forecasting the rate of copper extraction during the bioleaching of primary sulphide ore was established on the basis of the mathematical theory and the modeling process of grey system theory. It was used for forecasting the rate of copper extraction from the primary sulfide ore during a laboratory microbial column leaching experiment. The precision of the forecasted results were examined and modified via ＂posterior variance examination＂. The results show that the forecasted values coincide with the experimental values. GM （1,1） model has high forecast accuracy; and it is suitable for simulation control and prediction analysis of the original data series of the processes that have grey characteristics, such as mining, metallurgical and mineral processing, etc. The leaching rate of such copper sulphide ore is low. The grey forecasting result indicates that the rate of copper extraction is approximately 20% even after leaching for six months.

关键词： primary copper sulfide ore bioleaching extraction rate grey theory forecasting model

Field Tests for Investigating the extraction rate of Piles Using a Vibratory Technique

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Journal of Shanghai Jiaotong university(Science) 2018年第4期23卷 482-489页

作者： QIN Zhaohui CHEN Longzhu SONG Chunyu ZHANG Jingyi School of Naval Architecture Ocean and Civil Engineering Shanghai Jiao Tong University Shanghai 200240 China Sichuan Institute of Building Research Chengdu 610081 China

Factors directly affecting the extraction rate of the piles pulled out by a vibratory pulling system are summarized and classified into five categories(excitation force,resistance,vibration amplitude,pile plumbness keeping,and slowing down at the later stage) from the mechanics and engineering *** tests on steel sheet piles extracted by vibratory technique in different soil conditions are conducted to ascertain how these factors affect the extraction rate of a pile with regard to three major actors of vibratory pile pulling:the pile to be extracted,the selected pulling system,and the imposed soil *** extraction rates of three different sheet pile types(having up to four different lengths) pulled out by two different vibratory pulling systems are *** piles with different lengths and types,pulled out with or without a clutch,have different extraction *** working parameters governing the vibratory hammer,such as excitation force and vibration amplitude,exert significant influences on the rate of pile extraction,especially in the early stages of up-lift *** extraction rate of the piles driven in different soil conditions is uniform because different extraction resistances mainly refer to shaft *** properties of the pile-soil interface influence the extraction rate of the piles,and the extraction rate decreases with the time for which the piles have been buried in the earth.

关键词： field tests steel sheet pile vibratory pile pulling extraction rate

Recovery of Copper Ions from Wastewater by Hollow Fiber Supported Emulsion Liquid Membrane

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Chinese Journal of Chemical Engineering 2013年第8期21卷 827-834页

作者：郑辉东陈晶晶王碧玉赵素英 College of Chemistry and Chemical Engineering Fuzhou University

Recovery of copper ions from wastewater using a hollow fiber supported emulsion liquid membrane (HFSELM) was studied with LIX984N as carrier, kerosene as diluents, and sulfuric acid solution as stripping phase. Effects of compositions of feed and emulsion liquid phase, flow rates on both sides of membrane, and hollow fiber module parameters were investigated. The stability of the emulsion liquid phase without surfactant and the effect of buffer in the feed phase on the extraction rate were also evaluated. It is found that the stability of the emulsion phase without surfactant is poor. Higher flow velocity gives shorter residence time for the emulsion liquid phase on the tube side, reducing the effect of particle coalescence on the separation process. The extraction rate increases with the increase of feed phase pH, carrier concentration, hydrogen ion concentration in the stripping phase, and ef- fective hollow fiber area. The phase ratio in the emulsion liquid phase has a negative effect on extraction rate. The flow rates on both sides have little influence on the extraction performance of the HFSELM, while buffer addition in the feed solution improves the extraction efficiency.

关键词： copper ion supported emulsion liquid membrane extraction rate hollow fiber

extraction of rare earth ions from phosphate leach solution using emulsion liquid membrane in concentrated nitric acid medium

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Journal of Rare Earths 2018年第11期36卷 1190-1197页

作者： Qianlin Chen Xin Ma Xin Zhang Yunqi Liu Ming Yu School of Chemistry and Chemical Engineering Cuizhou University Guiyang 550003 China Guizhou Engineering & Technology Research Center of Clean Production in Phosphorus Chemical Industry Guiyang 550003 China

It is very significant to recover rare earths （REs） from wet-process phosphoric acid, in terms of extraction rate and selectivity, the current carrier di（2-ethlhexly） phosphate （D2EHPA） out there is still inferior. Based on this question, our team modified D2EHPA to synthesize new extractants. This paper presents a comprehensive study on the extraction of rare earth ions （RE3＋） from phosphate leach solution using emulsion liquid membrane （ELM） in concentrated nitric acid medium. The ELM system is made up of （RO）2P（O）OPh-COOH as carrier, polyisocrotyl succinimide （T154） as surfactant, sulfonated kerosene as diluent, phosphoric acid （H3PO4） as stripping solution. Different chemical parameters such as type and concentration of carrier, surfactant, stripping solution, volume ratio of oil phase to internal phase, and volume ratio of emulsion ratio to external phase were analyzed. The extraction of RE^3＋ was evaluated by the yield of extraction. In addition, the demulsification process was also investigated. The proposed method of ELM using （RO）2P（O）OPh-COOH as carrier can he expected to provide an efficient, simplify operation, and facilitated method for extractine RE^3＋.

关键词： Emulsion liquid membrane Rare earth Nitric acid extraction rate Phosphate rock Stripping solution

Process Optimization of Ultrasonic extraction of Puerarin Based on Support Vector Machine

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Chinese Journal of Chemical Engineering 2014年第7期22卷 735-741页

作者：陈娟黄晓一齐岩磊祁欣郭青 College of Information Science & Technology Beijing University of Chemical Technology

In ultrasonic extraction technology, optimization of technical parameters often considers extraction medium only, without including ultrasonic parameters. This paper focuses on controlling the ultrasonic extraction process of puerarin, investigating the influence of ultrasonic parameters on extraction rate, and empirically analyzing the main components of Pueraria, i.e., isoflavone compounds. A method is presented combining orthogonal experi- mental design with a support vector machine and a predictive model is established for optimization of technical parameters. From the analysis with the predictive model, appropriate process parameters are achieved for higher extraction rate. With these parameters in the ultrasonic extraction of puerarin, the experimental result is satisfactory. This method is of significance to the study of extracfing root-stock plant medicines.

关键词： Ultrasonic extraction Orthogonal experimental design Support vector machine extraction rate

Review of Research on Li-Ion Batteries Waste Management

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Open Journal of Inorganic Chemistry 2022年第2期12卷 19-38页

作者： Rokhaya Sylla Gueye Nango Gaye Mamadou Baldé Adama Diedhiou Ngoné Diouf Seck Gorgui Awa Idrissa Ndoye Yoro Tine Matar Seck Djibril Fall Alassane Wele Mahy Diaw Laboratory of Physical Inorganic Organic and Therapeutic Chemistry Faculty of Medicine Pharmacy and Odontology Cheikh Anta Diop Dakar University (UCAD) Dakar Senegal Gaston Berger Saint-Louis University (UGB) Saint-Louis Senegal Alioune Diop Bambey University (UADB) Bambey Senegal

Li-ion batteries (Libs) are a mature technology widely used for energy storage in various electronic devices. Nowadays, this technology has become a leading candidate for the portable electronics market and for electric vehicles due to its good performance. As a result, the demand for Libs containing critical metals, rare earth elements and precious metals is increasing day by day with the accelerated upgrades of consumer electronics, which promotes the supply risk of many mining resources. In addition, the problems associated with the production of end-of-life Lib are increasing on a global scale. Used Libs are e-waste containing significant levels of critical raw materials (such as Co, Li, Mn and Ni) along with harmful substances. Without proper management of Lib waste, these precious metals and toxic substances may end up in nature and cause environmental and public health problems. In order to preserve nature, ensure sustainable resource management and stimulate the circular economy, it has become crucial to properly manage and recycle end-of-life Li-ion batteries. By the way, conventional methods focusing on pyrometallurgical treatments combined with hydrometallurgical treatment are widely studied to recover design metals from Libs waste. It is in this context that we have conducted this bibliographic synthesis, focusing on the efficiency of the solvents employed and their competitiveness for a more environmentally friendly economic management. In this manuscript, recent leaching, solvent extraction, electrodeposition and precipitation strategies to recover precious metals from end-of-life Li-ion battery designs are reviewed and the evolution of these processes is discussed.

关键词： Libs Waste Leaching extraction rate Affinity Partition Coefficient

Studies on extraction Process of Polysaccharides from Saccharomyces cerevisiae

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Agricultural Biotechnology 2015年第1期4卷 52-54,58页

作者： Yilei WANG Ming ZHANG Qian XU Hongyu YANG Guoqing MENG Chuanbao WANG Department of Life Science Heze University

In this study, with Saccharomyces cerevisiae as the experimental material, microwave-assisted technology, phenol-sulfuric acid method and UV spectro- photometry were employed to investigate the extraction rate of polysaccharides. Solid-liquid ratio, microwave power and microwave processing time were adopted as single factors to optimize the extraction conditions. Subsequently, orthogonal experiment was performed to investigate the optimal extraction process of polysaccha- rides from S. cerevisiae. The optimal extraction conditions were： solid-liquid ratio 1 ： 20, microwave power 250 W, microwave processing time 3 min, under which the extraction rate of polysaccharides reached 4.98%. Compared with conventional hot water extraction method, microwave-assisted extraction technology exhibited shorter extraction time, higher efficiency, and could save more energy.

关键词： Saccharomyees cerevisiae Microwave-assisted extraction technology extraction rate Optimal process

Study on Calcination Process of Serpentine Mixed with Ammonium Sulfate

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Study on Calcination Process of Serpentine Mixed with Ammoni...