Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Shanda South Road No. 27, Jinan, Shandong 250100, China.
J Hazard Mater. 2010 Apr 15;176(1-3):76-84. doi: 10.1016/j.jhazmat.2009.11.001. Epub 2009 Nov 10.
The preparation, characterization, preheating mechanism and bloating mechanism of ultra-lightweight ceramics (ULWC) manufactured by dehydrated sewage sludge (DSS) and clay were studied. Three experiments were designed to investigate the addition of DSS, the effect of preheating treatment and sintering treatment, respectively, and then the optimum conditions for preparing ULWC were determined. Chemical components, especially ratios of carbon content to iron oxide content (C/Fe-ratios), were used to explain the preheating mechanism; physical forces (surface tension and bloating force) combined with C/Fe-ratios were used to explain the bloating mechanism. The characterizations (physical properties, microstructure properties and toxic metal leaching properties) of ULWC that were prepared under the optimum conditions were tested. The results showed that the optimum addition of DSS was 20-30 wt.%, and the pellets which preheated at 400 degrees C for 20 min and sintered at 1150 degrees C for 10 min were beneficial to produce ULWC. Property tests of ULWC showed that ULWC was light (with a bulk density of 330.80 kg m(-3)), waterproof (with a water absorption of 5.30 wt.%), nontoxic (contents of toxic metal leaching test were all below the detection limit) and suitable for practical civil engineering.
研究了以脱水污泥（DSS）和粘土为原料制备超轻陶瓷（ULWC）的制备、表征、预热机理和膨化机理。设计了三个实验分别考察了 DSS 的添加量、预热处理和烧结处理的影响，然后确定了制备 ULWC 的最佳条件。化学组成，特别是碳含量与氧化铁含量的比值（C/Fe-比值），用于解释预热机理；物理力（表面张力和膨化力）与 C/Fe-比值相结合，用于解释膨化机理。在最佳条件下制备的 ULWC 的特性（物理性能、微观结构性能和有毒金属浸出性能）进行了测试。结果表明，DSS 的最佳添加量为 20-30wt.%，在 400℃预热 20min 和 1150℃烧结 10min 的球团有利于制备 ULWC。ULWC 的性能测试表明，ULWC 具有轻质（堆积密度为 330.80kg/m3）、防水（吸水率为 5.30wt.%）、无毒（浸出毒性试验的有毒金属含量均低于检测限），适用于实际土木工程。
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