中文摘要：

采用全量分析、形态分析和浸出毒性分析方法,研究了升温方式和焚烧时间对制革污泥焚烧后炉渣中Cr的环境风险的影响。实验结果表明：与梯度升温方式相比,即热升温方式有利于提高炉渣中Cr的富集率和残渣态比例,同时降低Cr的浸出毒性。随着焚烧时间的延长（〉20 min）,炉渣中Cr的环境风险逐渐增大,表现为Cr的富集率降低,可交换态比例和浸出毒性增加。为了使制革污泥焚烧过程更安全（即炉渣中Cr的富集率更高,Cr的可交换态≤10%,Cr的残渣态比例更高,炉渣中Cr的浸出毒性符合国家标准）,宜采用即热升温的加热方式焚烧,且焚烧时间不超过20 min。

英文摘要：

The effects of heating mode and combustion time on the environmental risk of Cr in bottom ash were investigated using quantity analysis, speciation analysis and leaching toxicity analysis. The results showed that, compared with gradient temperature-elevating mode, the recovery and residual fraction percentage of Cr in bottom ash were increased, and leaching toxicity of Cr in bottom ash was reduced using instant temperature-elevating mode. As the combustion time extended （〉20 min）, the recovery of Cr in bottom ash was declined, and exchangeable fraction percentage and leaching toxicity of Cr in bottom ash was increased, suggesting that the environmental risk of Cr in bottom ash became higher. Therefore, instant temperature-elevating mode and short time of combustion （〈20 min） were beneficial to the safety of the combustion of tannery sludge, which led to increased recovery of Cr in bottom ashes, lower percentage of Cr in exchangeable fraction （〈 10%）, higher percentage of Cr in residual fraction and the leaching toxicity fitting with national standard.