The pollution of semi-volatile heavy metals is one of the key environmental risks for municipal solid waste incineration, and in-situ adsorption of metals within the furnace by mineral sorbents such as kaolin has been demonstrated as a promising emission control method. To lessen the consumption of sorbent, a novel material of amorphous silicate was produced from kaolin through pressurised hydrothermal treatment. Its performance of gaseous PbCl₂ capture was tested in a fixed bed furnace and compared with unmodified kaolin and metakaolin. With increasing temperature, the adsorption rates for all sorbents declined due to higher saturated vapour pressure, while the partitions of residual form lead increased which indicated higher stability of heavy metals in the sorbent because of melting effect. The new sorbent with a larger surface area and reformed structure presented 26% more adsorption efficiency than raw kaolin at 900 °C, and increasing the modification pressure improved these properties. Additionally, the production of this high-temperature sorbent was relatively inexpensive, required little thermal energy and no chemicals to produce and no waste effluent was generated, thus being much cleaner than other modification methods.

半挥发性重金属的污染是城市生活垃圾焚烧的主要环境风险之一，并且已证明矿物吸附剂如高岭土在炉内原位吸附金属是一种有希望的排放控制方法。为了减少吸附剂的消耗，通过加压水热处理由高岭土生产了一种新型的无定形硅酸盐材料。气态PbCl _2的性能在固定床炉中测试捕集率，并与未改性的高岭土和偏高岭土进行比较。随着温度的升高，所有吸附剂的吸附速率由于较高的饱和蒸气压而下降，而残留形式的铅的分配增加，这表明由于熔融作用，重金属在吸附剂中的稳定性更高。在900°C时，具有较大表面积和重整结构的新型吸附剂的吸附效率比未加工的高岭土高26％，并且提高改性压力可改善这些性能。另外，这种高温吸附剂的生产是相对便宜的，需要很少的热能并且不需要产生化学物质，也没有产生废液，因此比其他改性方法清洁得多。