This study explored the effectiveness and mechanisms of high temperature sintering following prereduction with ferric sulfate (FeSO₄), sodium sulfide (Na₂S), or citric acid (C₆H₈O₇) in stabilizing hexavalent chromium (Cr(VI)) in highly contaminated soil. The soil samples had an initial total Cr leaching of 1768.83 mg/L, and Cr(VI) leaching of 1745.13 mg/L. When FeSO₄ or C₆H₈O₇ reduction was followed by sintering at 1000°C, the Cr leaching was reduced enough to meet the Safety Landfill Standards regarding general industrial solid waste. This combined treatment greatly improved the stabilization efficiency of chromium because the reduction of Cr(VI) into Cr(III) decreased the mobility of chromium and made it more easily encapsulated in minerals during sintering. SEM, XRD, TG-DSC, and speciation analysis indicated that when the sintering temperature reached 1000°C, almost all the chromium in soils that had the pre-reduction treatment was transformed into the residual form. At 1000°C, the soil melted and promoted the mineralization of Cr and the formation of new Cr-containing compounds, which significantly decreased subsequent leaching of chromium from the soil. However, without reduction treatment, chromium continued to leach from the soil even after being sintered at 1000°C, possibly because the soil did not fully fuse and because Cr(VI) does not bind with soil as easily as Cr(III).

本研究探讨了用硫酸铁（FeSO ₄），硫化钠（Na ₂ S）或柠檬酸（C ₆ H ₈ O ₇）预还原后稳定六价铬（Cr（VI））的高温烧结的有效性和机理在高度污染的土壤中。土壤样品的初始总Cr浸出量为1786.83 mg / L，Cr（VI）浸出量为1745.13 mg / L。当FeSO ₄或C ₆ H ₈ O ₇还原后再在1000°C下烧结，铬的浸出量降低到足以满足有关一般工业固体废物的安全填埋场标准。这种联合处理大大提高了铬的稳定化效率，因为将Cr（VI）还原为Cr（III）会降低铬的迁移率，并使其在烧结过程中更容易封装在矿物中。SEM，XRD，TG-DSC和形态分析表明，当烧结温度达到1000°C时，经过预还原处理的土壤中几乎所有铬都转化为残留形式。在1000°C，土壤融化并促进了Cr的矿化作用，并促进了新的含Cr化合物的形成，这大大减少了随后铬从土壤中的浸出。但是，如果没有减价处理，