EFFECTIVENESS OF ACIDIC INDUSTRIAL WASTES FOR RECLAIMING FINE BAUXITE REFINING RESIDUE (RED MUD)
EFFECTIVENESS OF ACIDIC INDUSTRIAL WASTES FOR RECLAIMING FINE BAUXITE REFINING RESIDUE (RED MUD)
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DOI：
10.1097/00010694-199408000-00005
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发表时间：
1994-08
期刊：
影响因子：
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通讯作者：
J. Wong;G. Ho
中科院分区：
文献类型：
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作者：
J. Wong;G. Ho
由于铝土矿精炼残渣的盐度和碱度较高，对铝工业产生的铝土矿精炼残渣进行土地处置，导致一些地区没有工厂。此外，这些残留物的细粒部分（赤泥）容易受到风和水的侵蚀，从而污染周围的土壤和地表水。进行了温室罐浸研究，以评估废石膏 (CaSO4) 和铜 (FeSO4) 作为赤泥部分改良剂的有效性。用0%、2%、5%和8%（w/w）的废物对赤泥进行修正，并用1200毫升（126分钟降雨量）去离子水浸出，然后使用长冰草进行出苗试验。渗滤液和土壤分析表明，石膏和铜矿改良剂能够显着降低赤泥的 pH 值、电导率 (EC) 和 Na 含量。 Copperas 在降低土壤 Na 含量和维持较低土壤 EC 方面更有效。另一方面，由于石膏的溶解度较低，石膏改良赤泥保持了较低的pH值和较高的Ca含量。这两项修订还导致可溶性铝含量和可交换钠百分比 (ESP) 显着降低。当施用量 >2% 时，pH、ESP 和 Al 含量的降低与冰草出苗率的提高相关。结果表明，石膏和铜矿都是有效的赤泥改良剂。然而，石膏似乎为赤泥提供了更持久的 pH 缓冲能力和更低的 ESP
Land disposal of bauxite refining residues produced by the aluminum industry has resulted in areas devoid of plants because of the high salinity and alkalinity of the residues. In addition, the fine fraction (red mud) of these residues is prone to wind and water erosion, which can pollute the surrounding soils and surface waters. A glasshouse pot-leaching study was performed to evaluate the effectiveness of waste gypsum (CaSO4) and copperas (FeSO4) as ameliorants for the red mud fraction. Red mud was amended with the wastes at rates of 0, 2, 5, and 8% (w/w), and leached with 1200 ml (126 min rainfall) of deionized water before conducting a seedling emergence test using Agropyron elongatum. Leachate and soil analyses indicated that gypsum and copperas amendments were able to reduce the pH, electrical conductivity (EC) and Na content of red mud significantly. Copperas was more effective in reducing soil Na contents and maintaining a lower soil EC. On the other hand, gypsum-amended red mud maintained a lower pH and a higher Ca content because of the low solubility of gypsum. Both amendments also resulted in significant reductions in soluble Al content and exchangeable sodium percentage (ESP). The reduced pH, ESP and Al content were correlated to the improved seedling emergence of Agropyron at application rates of >2%. The results demonstrate that both gypsum and copperas are effective ameliorants for red mud. However, gypsum appears to provide a more persistent pH buffering capacity and lower ESP for red mud