Fe and Mn removal from mining drainage using goaf filling materials obtained from coal mining process

2015 ◽  
Vol 72 (11) ◽  
pp. 1940-1947 ◽  
Author(s):  
Liping Zhang ◽  
Aolei Chen ◽  
Hongbin Qu ◽  
Shouqiang Xu ◽  
Xue Zhang ◽  
...  
Keyword(s):  
Coal Mining ◽  
Economic Benefit ◽  
Adsorption Kinetic ◽  
Mass Ratio ◽  
Inlet Concentration ◽  
Effluent Quality ◽  
Filling Materials ◽  
Adsorption Equation ◽  
Fe And Mn ◽  
Alkaline Conditions

Coal gangue, sandy soil and clay (mass ratio 45:4:1) as goaf filling materials acquired from coal mining processes were applied to remove Fe and Mn effectively from mining drainage. The results of an adsorption kinetic study showed that the Fe adsorption equation was y = 21.454y + 8.4712, R2 = 0.9924 and the Mn adsorption equation was y = 7.5409x + 0.905, R2 = 0.9957. Meanwhile, the goaf filling materials had low desorption capacity (Fe 6.765 μg/g, Mn 1.52 μg/g) and desorption ratio (Fe 8.98%, Mn 11.04%). Experiments demonstrated that Fe and Mn from mining drainage could be removed stably at a flow rate of 1.2 L/min, Fe inlet concentration of less than 40 mg/L, Mn inlet concentration of less than 2 mg/L and neutral or alkaline conditions. During a procedure of continuous experiments, the effluent quality could meet the requirement of the ‘Code for Engineering Design of Sewage Regeneration-GB503352-2002’. A real-application project using goaf filling materials to treat mining drainage in Shendong coal mine showed that the average cost per ton of mining drainage was about 0.55 RMB, which could bring about considerable economic benefit for coal mining enterprises.

The Coal Mining Mode of Paste-Like Fill and its Application Prospects

2011 ◽  
Vol 255-260 ◽  
pp. 3744-3748
Author(s):  
Yu Cheng Huang ◽  
Rui Min Feng ◽  
Hong Pan Wang ◽  
Wen Ping Zhao ◽  
Yong Fei Liu
Keyword(s):  
Coal Mining ◽  
Filling Material ◽  
Practical Situation ◽  
Filling Materials ◽  
Working Face ◽  
Main Components ◽  
Application Prospects

The coal mining mode of paste-like fill shows the connotation and characteristics of green mining both in the filling materials and mining backfill technology. Combined with the practical situation of colliery, some main components of the coal mining mode of paste-like fill are introduced emphatically, such as the cemented filling material, the preparation and transportation of filling materials, and filling technology at working face; the application prospects on mining with paste-like fill are analyzed.

Investigation on the Extraction of Aluminum and Iron from Fly Ash by Sodium Carbonate Fusion Method

2013 ◽  
Vol 807-809 ◽  
pp. 1262-1265
Author(s):  
Hong Jing Han ◽  
Yan Guang Chen ◽  
Jia Lu ◽  
Dan Dan Yuan ◽  
Jun Song ◽  
...  
Keyword(s):  
Fly Ash ◽  
Economic Benefit ◽  
Value Added ◽  
Fusion Method ◽  
Mass Ratio ◽  
Extraction Condition ◽  
Iron Extraction ◽  
Orthogonal Experiments ◽  
Optimum Extraction ◽  
Optimum Extraction Condition

In recent years, utilization of fly ash has gained much attention in public and industry, which will help reduce the environmental burden and enhance economic benefit. In the utilizations of fly ash, the most high value-added applications is extraction of metal elements from fly ash. In this paper, the aluminum and iron extraction was investigated by orthogonal experiments. The results show that the optimum extraction condition was reaction temperature 800 °C, reaction time 3 h, the mass ratio of fly ash to Na2CO3 was 1:1.5.

scholarly journals Experimental Study on Acoustic Emission of Confined Compression of Crushed Gangue under Different Loading Rates: Disposal of Gangue Solid Waste

2020 ◽  
Vol 12 (9) ◽  
pp. 3911
Author(s):  
Junmeng Li ◽  
Yanli Huang ◽  
Wen Zhai ◽  
Yingshun Li ◽  
Shenyang Ouyang ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Coal Mining ◽  
Loading Rate ◽  
Activity Level ◽  
Hysteresis Phenomenon ◽  
Main Body ◽  
Confined Compression ◽  
Loading Rates ◽  
Filling Materials ◽  
Resistance To Deformation

The crushed gangue materials which are filled into the goaf in solid-backfilling coal mining become the main body of bearing the overburden after the tamping process. Its resistance to deformation is the key to control overburden movement and surface subsidence. Particle breakage affects the resistance to deformation of filling materials. In this paper, a confined compression test of crushed gangue under different loading rates was designed, and the acoustic emission (AE) signal was monitored in the process of confined compression. The test results showed that with the increase of loading rate, the anti-deformation ability of crushed gangue showed a dynamic change process of increasing, decreasing, and then increasing again. With the increase of loading rate, the breakage degree of the samples decreased, the proportion of large-sized gangue increased, the growth period of AE counts showed an obvious hysteresis phenomenon, and the AE activity level of the gangue increased gradually. The research results can not only provide a more in-depth and comprehensive understanding of the mechanical properties of crushed gangue filling materials but also provide a reference for the engineering application of solid-filling coal mining.

Theoretical research on mass ratio in solid backfill coal mining

2016 ◽  
Vol 75 (7) ◽  
Author(s):  
Qiang Zhang ◽  
Ji-xiong Zhang ◽  
Xiao-le Han ◽  
Feng Ju ◽  
Yang Tai ◽  
...  
Keyword(s):  
Coal Mining ◽  
Theoretical Research ◽  
Mass Ratio

scholarly journals Wood Biomass from the Model Wastewater and Its Fractionation

2015 ◽  
Vol 1 ◽  
pp. 190
Author(s):  
Galia Shulga ◽  
Sanita Vitolina ◽  
Julia Brovkina ◽  
Brigita Neiberte ◽  
Anrijs Verovkins ◽  
...  
Keyword(s):  
Oxygen Demand ◽  
Wood Products ◽  
Water Soluble ◽  
Waste Biomass ◽  
Mass Ratio ◽  
East Europe ◽  
Uv Raman Spectroscopy ◽  
Alkaline Conditions ◽  
Uv Raman ◽  
Solid Biomass

The production of veneer in Latvia and many countries of East Europe is accomplished by the hydrothermal treatment of hardwood in special water basins. As a result, formed effluents contain wood-originated pollutants, which are responsible for the enhanced chemical oxygen demand and the intensive colour of the wastewater. Keeping in mind the volume of the polluted effluents formed annually at the Latvian plywood plants, it is very important to extract qualitatively and quantitatively the formed biomass from the effluent. The choose of an effective method of the waste biomass extraction depends on chemical characterisation of the effluent. In this work, for imitating woodworking wastewater, birch sawdust was hydrothermally treated in mild alkaline conditions at 90°C. The yield of the solid biomass did not exceed 7% and contained, mainly, hemicelluloses in the polysaccharide form and lignin. The applied instrumental analysis (FTIR-, UV-, Raman spectroscopy) testify the dominant content of hemicelluloses in the obtained biomass. The fractionation of the biomass was performed using concentrated sulphuric acid and ethanol. As the obtained results have shown, the content of lignin, hemicelluloses and water-soluble degraded wood products in the solid biomass corresponded to the following mass ratio: 1.2 /6.7 /1.0, respectively.

scholarly journals Controlled Preparation of Different Proportions of Metal Fe-Mn from Waste Mn Ferrite by Molten Salt Electrolysis

Processes ◽  
2020 ◽  
Vol 8 (12) ◽  
pp. 1647
Author(s):  
Shiyuan Liu ◽  
Lijun Wang
Keyword(s):  
Molten Salt ◽  
New Method ◽  
Mass Ratio ◽  
Molten Salt Electrolysis ◽  
Direct Transformation ◽  
Fe And Mn ◽  
Novel Method ◽  
Controlled Preparation

A novel method for efficiently recovering Fe and Mn from waste Mn ferrite by molten salt electrolysis is firstly proposed. The electrolysis of molten salt (MnCl2 (1.06 wt%)-FeCl3 (2.69 wt%)-NaCl-KCl) was performed at 800 °C. The phase of product at 2.0 V was metal Fe while metal Fe and Mn were obtained by molten salt electrolysis at 2.3 V. The Fe/Mn mass ratio of electrodeposited products at 2.0 V and 2.3 V were 687 and 3.2, respectively. The different proportions of metal Fe-Mn were prepared by controlling the electrolytic voltages. This new method can realize direct transformation of waste Mn ferrite to Fe-Mn alloy.

Preparation and Study of Zinc-Air Batteries with Carbon-Supported Amorphous MnO2 Catalyst

2013 ◽  
Vol 724-725 ◽  
pp. 813-817
Author(s):  
Jin Ning Cheng ◽  
De Li Liu ◽  
Lu Yang ◽  
Jia Jun Han
Keyword(s):  
Activated Carbon ◽  
Specific Energy ◽  
Carbon Material ◽  
Redox Reaction ◽  
Economic Benefit ◽  
Molar Ratio ◽  
Energy Curve ◽  
Mass Ratio ◽  
Air Battery ◽  
Zinc Air Batteries

Activated carbon as a supporter, using a redox reaction of MnSO4žH2O and KMnO4, carbon-supported amorphous MnO2catalysts were prepared for zinc-air battery positive. Using XRD and specific energy curve, the effects of MnO2/C and the corresponding zinc-air battery were studied by carbon material type and its amount, concentration of KMnO4and the molar ratio of MnSO4žH2O and KMnO4by XRD. The results show that: Coal activated carbon as carbon supporter, C and MnO2mass ratio was 4:3, concentration of KMnO4in 27.2g L-1, molar ratio of KMnO4and MnSO4žH2O was 2:3, get the battery performance and economic benefit of the best. Coal activated carbon, C and MnO2quality ratio is 4:3, the KMnO4concentration 27.2g L-1, KMnO4and MnSO4žH2O molar ratio of 2:3, best battery of the performance and economic benefits4.

scholarly journals Experimental study on proportioning and properties of cemented filling material with a large mass ratio of construction demolition waste

2020 ◽  
Author(s):  
Yewu Bi ◽  
Weixin Chen ◽  
Yucheng Huang
Keyword(s):  
Raw Materials ◽  
Large Mass ◽  
Recycled Aggregate ◽  
Filling Material ◽  
Mass Ratio ◽  
Solid Mass ◽  
Demolition Waste ◽  
Aggregate Gradation ◽  
Filling Materials ◽  
Large Mass Ratio

Abstract Supply of cheap and abundant raw materials is a key factor in reducing the cost of cemented filling materials. To solve this problems of the high cost of cemented filling materials and insufficient sources of raw materials, an experimental study on cemented filling material with a large mass ratio of construction demolition waste was performed. A large amount of recycled aggregate of construction demolition waste was added to cemented material to prepare a high concentration slurry, from which the influences of aggregate/cement mass ratio, admixture/cement mass ratio, water/solid mass ratio, recycled aggregate gradation and mud content of recycled aggregate on slump, setting time and compressive strength of cemented filling material with a large mass ratio of construction demolition waste were analysed via the orthogonal test method and regression equation analysis. Finally, an industrial formula for cemented filling material with a large mass ratio of construction demolition waste was determined, and the mechanical and microscopic properties were analysed. The results indicate that the industrial formula with an aggregate/cement mass ratio of 3.0, an admixture/cement mass ratio of 1.5%, a water/solid mass ratio of 0.35, a recycled aggregate gradation of 40:30:15:15, a mud content of recycled aggregate of 0ཞ4% and a mass ratio of construction demolition waste to solid material of 75% exhibits the properties of rapid strength growth and high residual strength, and can be applied in underground coal mines conditions.

scholarly journals Kinetika Adsorpsi Nikel (II) dalam Larutan Aqueous dengan Karbon Aktif Arang Tempurung Kelapa

2016 ◽  
Vol 10 (2) ◽  
pp. 36 ◽  
Author(s):  
Ardelita Adiningtyas ◽  
Panut Mulyono
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Adsorption Kinetics ◽  
Particle Diameter ◽  
Adsorption Kinetic ◽  
Coconut Shell ◽  
Nickel Concentration ◽  
Mass Ratio ◽  
Adsorption Temperature ◽  
Kinetics Of

The adsorption kinetics of nickel (II) in aqueous solution with activated carbon from coconut shell was studied by measuring the nickel concentration in the solution (C) as a function of time (t). The parameters studied in this study were adsorption temperature (T), particle diameter of activated carbon (d), and mass ratio of activated carbon to aqueous solution (r). It was found that the adsorption rate increased with the increase of the adsorption temperature and the mass ratio of activated carbon to aqueous solution. On the contrary, it was found that the rate of adsorption decreased with increasing the particle diameter of the activated carbon. Keywords: adsorption kinetic, nickel (II), activated carbon, coconut shell Kinetika adsorpsi larutan nikel (II) dalam air dengan karbon aktif tempurung kelapa dianalisis dengan mengukur konsentrasi nikel pada larutan sebagai fungsi waktu. Parameter yang digunakan pada penelitian ini adalah suhu adsorpsi (T), diameter partikel karbon aktif tempurung kelapa (d), dan rasio massa karbon aktif tempurung kelapa dengan larutan nikel (II) dalam air (r). Hasil penelitian menunjukkan bahwa laju adsorpsi meningkat dengan bertambahnya suhu adsorpsi dan rasio massa karbon aktif tempurung kelapa dengan larutan. Sedangkan, laju adsorpsi menurun dengan bertambahnya ukuran diameter partikel karbon aktif tempurung kelapa. Kata kunci: kinetika adsorpsi, nikel (II), karbon aktif, tempurung kelapa

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