Có 11+ tài liệu thuộc chủ đề "ứng dụng bùn đỏ"
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Adsorption of Phosphate from Aqueous Solution Using Activated Red Mud. Adsorption of phosphate (PO 4 32 ) from aqueous solution on ac- tivated red mud (ARM) was studied as a function of time, pH, temperature, concentration of adsorbent and adsorbate in acetic acid–sodium acetate buffer medium. The adsorption of phosphate follows Langmuir as well as Freundlich adsorption isotherms. Key Words:...
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APPLIED CATALYSIS A: GENERAL. E L S E V I E R Applied Catalysis A: General . Characterization and deactivation of sulfided red mud used as hydrogenation catalyst. Red mud is a residue in the production of alumina by the Bayer process. The evolution of sulfided red mud activity and selectivity with reaction time was studied for the hydrogenation of...
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REMOVAL OF CONGO RED FROM WASTEWATER BY ADSORPTION ONTO WASTE RED MUD. Waste red mud, an industrial byproduct, generated during the processing of bauxite ore, is recycled for the adsorption of congo red from aqueous solution.. The adsorption capacity of the red mud for the dye was 4.05 mg/g. Effect of pH and desorption studies suggest that the mechanism of...
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In the present research a sequential step extraction was employed to investigate metal speciation (into exchangeable, bound to carbonate, to Mn and Fe oxides, to organic matter and in residue phase) and the effect of red mud on metal speciation in compost of sewage sludge for Cr, Cu, Ni, Pb and Zn. The effect of red mud addition and composting...
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HEAVY METAL CATION UNCONVENTIONAL SORBENTS ASHES). (RED MUDS AND FLY. bauxite waste red muds and coal fly ashes acting as sorbents. These heavy-metal-loaded solid wastes may then be solidified by adding cement to a durable concrete mass assuring their safe disposal. The breakthrough volumes of the heavy metal solutions have been measured by dynamic column experiments so as to determine...
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Phosphate removal from aqueous solutions using red mud wasted in bauxite Bayer's process. The red mud wasted from the Guinean bauxite refinery was studied for phosphate removal from model aqueous solutions of potassium orthophosphate (OPh) and sodium tripolyphos- phate (TPPh). The red mud has been treated with concentrated sulphuric acid. After filtration of the acid suspension, the activated mud was...
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The addition of clay in the form of bauxite refining residue (red mud) prior to composting has been suggested as a way to control heavy metal mobility in compost. Leachability and plant availability of metals in a mixture of grass clippings and sawdust spiked with metal solution was markedly reduced during the composting process. The fate of metals in municipal...
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IMMOBILIZATION OF HEAVY METALS IN SEDIMENT DREDGED FROM A SEAPORT BY IRON BEARING. Pot and field trials were carried out using sediment dredged from the port of Bremen (Germany) and deposited in a settling basin near Bremen. the sediment is polluted with Cd and Zn. Five iron-bearing materials were added to the soil (1% pure Fe in soil dry matter)...
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Adsorption of Hexavalent Chromium from Aqueous Solution by Using Activated Red Mud. Adsorption by activated red mud (ARM) is investigated as a possible alternative to the conventional methods of Cr(VI) re- moval from aqueous synthetic solutions and industrial effluents.. Adsorption characteristics suggest the heterogenous nature of the adsorbent surface sites with respect to the energy of adsorption.. The applicability of...
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A new method for enhancing the performance of red mud as a hydrogenation catalyst. A new method is presented for improving the performance of red mud as a hydrogenation catalyst (a residue from the production of alumina by the Bayer process that contains iron oxides), based on the method developed by K.C. Pratt and V.. The activation method consists essentially...
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Arsenic removal from aqueous solutions by adsorption on red mud. The tests showed that the alkaline aqueous medium (pH 9.5) favored the removal of As(III), whereas the pH range from 1.1 to 3.2 was eective for As(V) removal. It was found that the adsorption of As(III) was exothermic, whereas As(V) adsorption was endothermic. Red mud. Arsenic, being one of the...