Influence of absorbents on heavy metals during combustion of oil shale semi-coke

doi:10.16085/j.issn.1000-6613.2016.08.45

Abstract

Abstract: To study the effects of different final temperatures to heavy metals volatilization and adsorbent adsorption characteristics,an experiment of Huadian oil shale semi-coke combustion is carried out. Results indicate that the volatilization rate of each element increases along with the raise of temperature,and the volatilization rate of Cd,Te,Co,Sn,Pb and Sb increases distinctly when temperature reaches to 650℃. Cd and Te have higher volatilization rate,while that of Mn,Y and W is relatively lower within each temperature segment. The contents of most elements significantly increase after adding Kaolin and CaO,showing that the adsorbents have good adsorption effects for most elements. As can be seen from the adsorption rate,except W and Te,CaO has good adsorption effects for the metal elements like Co,Mn,Cu,Y,Sn and Cd in especial,while Kaolin has good adsorption effects for the metal elements like Co,Mn,Cu,Y,Sn and Cd except Pb and Te. CaO has better adsorption effects about same certain heavy metal elements than Kaolin.

Key words: oil shale, heavy metals, volatilization, adsorbent

摘要： 通过对桦甸油页岩半焦进行燃烧实验，研究了不同终温下部分重金属元素的挥发特性及吸附剂的吸附效果，研究表明：随着温度的增加，各元素的挥发率均呈现出增大的趋势，且当温度为650℃时，元素Cd、Te、Co、Sn、Pb、Sb的挥发率呈现出明显的增大趋势；相对而言，各温度段下元素Cd、Te的挥发率较大，元素Mn、Y、W的挥发率较低。添加吸附剂CaO和高岭土后，大部分元素在页岩灰中的含量均明显增加，表明吸附剂对大部分重金属元素具有良好的吸附效果；通过吸附率可以看出，吸附剂CaO除元素W、Te未发现吸附效果外，对其他所研究的重金属元素均有较强的吸附效果，尤其是元素Co、Mn、Cu、Y、Sn、Cd；而高岭土除对元素Pb、Te未发现吸附效果外，对其他元素均具有一定的吸附效果，尤其是元素Co、Mn。相比而言，CaO对重金属元素的吸附效果要比高岭土强。

关键词: 油页岩, 重金属元素, 挥发特性, 吸附剂

CLC Number:

X506

BAI Jingru, ZHANG Wei, CHEN Dingxing, SHAO Jiaye, BAI Na, WANG Qing. Influence of absorbents on heavy metals during combustion of oil shale semi-coke[J]. Chemical Industry and Engineering Progree, 2016, 35(08): 2586-2591.

柏静儒, 张伟, 陈定形, 邵佳晔, 白娜, 王擎. 固体吸附剂对油页岩半焦燃烧过程中重金属元素的影响[J]. 化工进展, 2016, 35(08): 2586-2591.

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