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MONTMORILLONITE BLOCKS FOR HEAVY METALS ADSORPTION IN WATER BY BENTONITE AND FLY ASH.
MONTMORILLONITE BLOCKS FOR HEAVY METALS ADSORPTION IN WATER BY BENTONITE AND FLY ASH.
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机译：膨润土和粉煤灰吸附水中重金属的蒙脱石块。
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摘要
The present invention describes a bentonite composite material and a sol-gel silica alkaline solution as a binder, of relatively light weight, capable of adsorbing heavy metals present in water. Said material is composed mostly of expanding clay which maintains it intact when inmersion.To afford this effect, the lightweight, porous and water permeable material receives a heat treatment of up 400°C to 1400°C, thus giving rigidity and resistance to lower impacts and allowing to acquire the insolubility property when immersed. The aforementioned material possess a density of up 700 kg/m3 to 1,500 kg/m3 and a compressive resistance in the range of up 12 kg/cm2 to 16 kg/cm2. The material is related primarily to the metal-mechanic and mining industries effluent sanitation, as well as natural contamination of surface and subterranean waters. The heavy metal ion adsorbent material may include fly ash and/or zeolites to supplement the adsorption capacity, as well as embossments of volcanic origin as coarse aggregate, as a porous material that can provide water permeability and reduce costs acting as filler particles. The preparation method no requires high energy consumption or involve large installations. This cementitious composition comprises bentonite, which allows including fly ash and/or zeolite, and binds to an alkaline chemical solution of silica under conditions of pH 7 by the sol-gel process.
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机译：本发明描述了一种膨润土复合材料和一种作为粘合剂的溶胶-凝胶二氧化硅碱性溶液，其重量较轻，能够吸附水中存在的重金属。所述材料主要由膨胀粘土组成，浸入后可保持其完整性。为此，轻质，多孔且可透水的材料接受了高达400°C至1400°C的热处理，因此具有刚性和抗低冲击性并在浸入时获得不溶性。前述材料具有高达700kg / m 3至1,500kg / m 3的密度和高达12kg / cm 2至16kg / cm 2的抗压强度。该材料主要与金属机械和采矿业的污水卫生以及地表水和地下水的自然污染有关。重金属离子吸附材料可包括飞灰和/或沸石以增加吸附能力，以及作为粗骨料的火山成因的浮雕，作为可提供水渗透性并降低用作填料颗粒的成本的多孔材料。该制备方法不需要高能耗或涉及大型装置。该胶结组合物包含膨润土，其允许包含粉煤灰和/或沸石，并通过溶胶-凝胶法在pH> 7的条件下结合至二氧化硅的碱性化学溶液。
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