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石灰干化污泥作為配料部分替代冶金燒結中熔劑和燃料

Lime-mediated sewage sludge partly replacing fluxes and fuels as metallurgy sintering ingredients

  • 摘要: 利用冶金燒結方法處置石灰干化污泥,探討了石灰干化污泥作為冶金配料替代燃料和熔劑石灰對燒結性能的影響.對石灰干化污泥進行熱重差示掃描量熱和x射線衍射分析顯示,從室溫升至1100℃的過程中,污泥中的有機物分解產生熱量,CaCO3和Ca(OH)2轉化為CaO.燒結杯實驗結果表明:在適宜的配碳量下,石灰干化污泥的加入對燒結有正向的影響,燒結礦的性能指標均有所改善;當石灰干化污泥替代熔劑和燃料的比例分別為51%和13.3%,配入比例為3.00%時,燒結的垂燒速度為21.30mm·min-1,成品率為72.63%,利用系數為1.458t·m-2h-1,固體燃耗由每噸65.54kg降至59.27kg.

     

    Abstract: Lime-mediated sewage sludge was used in metallurgy sintering. Its impact on the sinter performance was discussed when partly replacing fuels and fluxes as a metallurgy ingredient. Thermogravimetry-differential thermal analysis (TG-DTA) and X-ray diffraction analysis (XRD) show that in the process of room temperature to 1100℃, organic matter in the sludge decomposes to generate heat, meanwhile CaCO3 and Ca(OH)2 turn into CaO. Sintering cup experiment results indicate that the sludge has a positive impact on sintering with appropriate carbon quantities and the sinter quality index is improved. When the sludge ratio is 3.00% and the ratios of replacing the flux and fuel with the sludge are 51% and 13.3% respectively, the vertical burning rate of sintering is 21.30 mm·min-1, the yield is 72.63%, the utilization coefficient is 1.458 t·m-2·h-1, and the fuel consumption per ton falls to 59.27 kg from 65.54 kg.

     

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