石灰干化污泥作为配料部分替代冶金烧结中熔剂和燃料

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

利用冶金烧结方法处置石灰干化污泥,探讨了石灰干化污泥作为冶金配料替代燃料和熔剂石灰对烧结性能的影响.对石灰干化污泥进行热重差示扫描量热和X射线衍射分析显示,从室温升至1100℃的过程中,污泥中的有机物分解产生热量,CaCO_3和Ca(OH)_2转化为CaO.烧结杯实验结果表明:在适宜的配碳量下,石灰干化污泥的加入对烧结有正向的影响,烧结矿的性能指标均有所改善;当石灰干化污泥替代熔剂和燃料的比例分别为51%和13.3%,配入比例为3.00%时,烧结的垂烧速度为21.30 mm·min^(-1),成品率为72.63%,利用系数为1 458 t·m^(-2) h^(-1).固体燃耗由每吨65.54 kg降至59.27 kg.

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.