ball milling diagram for non ferric alum powder for pulverization

how ferric alum is used in paper making

how ferric alum is used in paper making

This coal mining project is an open pit mine located in Nigeria, announced by mining company - Western Goldfields - that it has discovered 62,400,000 tonnes of proven reserves of coal deposits worth US$1.2 billion which could be used for the generation of electric power...

materials for lithium-ion batteries by mechanochemical methods - sciencedirect

materials for lithium-ion batteries by mechanochemical methods - sciencedirect

Lithium-ion batteries have many advantages over traditional rechargeable batteries and their development has been very rapid. In this chapter, preparation and electrochemical performance of their key materials including cathode materials such as LiCoO2 and LiMn2O4, anode materials such as carbon, alloys and nitrides, and electrolytes such as oxides and sulfides by mechanochemical (MC) methods are primarily summarized. Compared with conventional solid state reactions at high temperature, the MC methods appear to accelerate and simplify the synthesis process and decrease the energy expenses as well as the cost of the material. In addition, the prepared materials present good electrochemical performance. When MC methods are combined with other techniques, their advantages can be more fully displayed. In the meanwhile, MC reactions will have some unfavourable actions to some materials which should be avoided. Finally, some further aplications for MC methods in lithium-ion batteries are pointed out.

fabrication of low cost fine-grained alumina powders by seeding for high performance sintered bodies - sciencedirect

fabrication of low cost fine-grained alumina powders by seeding for high performance sintered bodies - sciencedirect

The effect of seeding into commercial aluminum hydroxide on the -alumina transition temperature, powder characteristics and properties of sintered bodies was investigated, with the purpose of obtaining high performance sintered bodies from low cost raw material. A small amount of fine -alumina seed addition, which was worn from wet ball milling, drastically lowered the -alumina transition temperature. The particle size of the low temperature transformed seeded powder was smaller than non-seeded powder. This powder could be sintered to full dense at lower temperature. The abnormal grain growth, which is often observed in high temperature sintered usual purity alumina, occurred at lower temperature in the sintered low temperature transformed seeded powder. However, the abnormal grain size was small and the number of the grains was high. The sintered bodies with these microstructures show high bending strength and very high fracture toughness.

stabilization of ferric arsenate sludge with mechanochemically prepared fes2/fe composites - sciencedirect

stabilization of ferric arsenate sludge with mechanochemically prepared fes2/fe composites - sciencedirect

FeS2/Fe composites were mechanochemically prepared with iron powder and pyrite for the stabilization of ferrite arsenate sludge (FAS). The effects of preparation parameters on stabilization performance were investigated. The results show that the optimum conditions are FeS2/Fe molar ratio of 5:5, milling time of 2 h, ball-to-material mass ratio of 15:1 and milling with stainless steel ball. Then, the composites were characterized by XRD, SEM, FTIR, etc. The physicochemical properties of FeS2/Fe mixture change dramatically, which is responsible for its excellent performance. Finally, the stabilization process of FAS was optimized. When the FAS is mixed with composites at mass ratio of 4:1 and milled for 30 min, the As leaching concentration of FAS can be reduced from 639.15 to 4.74 mg/L with the stabilization ratio of 99.2%.

Foundation item: Projects (2018YFC1900305, 2018YFC1903301) supported by the National Key R&D Program of China; Project (51825403) supported by the National Natural Science Foundation for Distinguished Young Scholars of China; Project (51634010) supported by the National Natural Science Foundation of China; Project (2017RS3010) supported by the Science and Technology Program of Hunan Province, China

high efficient coagulant simply by mechanochemically activating kaolinite with sulfuric acid to enhance removal efficiency of various pollutants for wastewater treatment - sciencedirect

high efficient coagulant simply by mechanochemically activating kaolinite with sulfuric acid to enhance removal efficiency of various pollutants for wastewater treatment - sciencedirect

Ball milling to activate kaolinite with sulfuric acid to directly prepare Al-based coagulant.Excellent removal performances on four chosen typical pollutants.Transformation of waste clay mineral into coagulant for environmental purification.Environment friendly process without pollution emission.

Coagulant has been widely used in the pretreatment of wastewater, and a simple and environment- friendly process to prepare high-efficiency coagulants is highly desired in response to the expected increase in amounts for water treatment. In this study, a novel process to prepare aluminum-based coagulant was developed by a mechanochemical activation of kaolinite, followed by co-grinding with concentrated sulfuric acid. The composition, structure and morphology of the coagulant were characterized using X-ray Powder Diffraction, Fourier Transform Infrared Spectrometer and Scanning Electron microscopy. Capacity of the product serving directly as coagulant, compared with pure aluminum sulfate, was evaluated by the removal efficiency of turbidity, phosphate, arsenate(V) and humic acid, reaching 99.9%, 91.2%, 89.6%, and 92.3%, respectively. Moreover, the formation of alum flowers was observed over a wide pH range of 4.39.0. The potential applications of the promising green coagulant in the pre-treatment process of sewage, through the simple preparation by non-thermal mechanochemical activation of kaolinite, provides a new route to utilize kaolinite-rich tailings of coal mining gangue etc.

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