• •
收稿日期:
2024-01-12
修回日期:
2024-07-16
出版日期:
2024-07-17
通讯作者:
张军营
作者简介:
赵国栋(1999—),男,硕士研究生,2577166585@qq.com
基金资助:
Guodong ZHAO(), Zhuo XIONG, Yongchun ZHAO, Junying ZHANG(
)
Received:
2024-01-12
Revised:
2024-07-16
Online:
2024-07-17
Contact:
Junying ZHANG
摘要:
碳热还原是垃圾焚烧飞灰中六价铬化合物还原脱毒的有效手段,但碳热还原条件和飞灰的组分变化会影响铬的形态转化。使用竹炭(Bamboo Charcoal,BC)和活性炭(Powered Active Carbon,PAC)与Na2CrO4反应探索碳热还原对Cr(Ⅵ)形态转化的过程,并分析碳热反应中四种氧化物对Cr(Ⅵ)形态转化的影响。实验结果表明,1000 ℃以下Na2CrO4被还原为NaCrO2,高于1000 ℃则转化为Cr3C2。氧化物存在时,高于1000 ℃后Fe2O3与被BC还原的铬反应生成FeCr2O4,在CaO含量高时转化为CaCr2O4;若添加过量BC则仍以Cr3C2为主。在喷钙的飞灰中,CaO与被还原的Cr反应生成CaCr2O4;若添加过量的BC,Cr(Ⅵ)则被还原为Cr3C2。
中图分类号:
赵国栋, 熊卓, 赵永椿, 张军营. 焚烧飞灰中六价铬化合物碳热还原脱毒实验研究[J]. 化工学报, DOI: 10.11949/0438-1157.20240058.
Guodong ZHAO, Zhuo XIONG, Yongchun ZHAO, Junying ZHANG. Experimental study on detoxification of hexavalent chromium compounds in incineration fly ash by carbothermal reduction[J]. CIESC Journal, DOI: 10.11949/0438-1157.20240058.
飞灰 | 占比(wt%) | |||
---|---|---|---|---|
Al2O3 | SiO2 | CaO | Fe2O3 | |
NJ | 0.77 | 2.24 | 54.55 | 0.3 |
XY | 0.74 | 0.66 | 3.1 | 0.39 |
JN | 0.936 | 1.33 | 22.59 | 0.689 |
表1 飞灰中四种氧化物的占比
Table 1 Percentage of four oxides in fly ash
飞灰 | 占比(wt%) | |||
---|---|---|---|---|
Al2O3 | SiO2 | CaO | Fe2O3 | |
NJ | 0.77 | 2.24 | 54.55 | 0.3 |
XY | 0.74 | 0.66 | 3.1 | 0.39 |
JN | 0.936 | 1.33 | 22.59 | 0.689 |
化学成分(wt%) | 工业分析(wt%) | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
SiO2 | MgO | CaO | K2O | Fe2O3 | Al2O3 | M | A | V | FC | ||
BC | 12.685 | 4.032 | 6.986 | 47.779 | 4.461 | / | 6.28 | 4.73 | 14.3 | 74.69 | |
PAC | 23.183 | 6.722 | 6.936 | 2.771 | 5.993 | 2.668 | 4.13 | 1.23 | 17.75 | 76.89 |
表2 BC和PAC的化学成分和工业分析
Table 2 Chemical compositions and industrial analysis of carbons
化学成分(wt%) | 工业分析(wt%) | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
SiO2 | MgO | CaO | K2O | Fe2O3 | Al2O3 | M | A | V | FC | ||
BC | 12.685 | 4.032 | 6.986 | 47.779 | 4.461 | / | 6.28 | 4.73 | 14.3 | 74.69 | |
PAC | 23.183 | 6.722 | 6.936 | 2.771 | 5.993 | 2.668 | 4.13 | 1.23 | 17.75 | 76.89 |
比表面积(m2/g) | |
---|---|
BC | 106.5 |
PAC | 1384.4 |
表3 BC和PAC的比表面积
Table 3 Specific surface area of BC and PAC
比表面积(m2/g) | |
---|---|
BC | 106.5 |
PAC | 1384.4 |
SiO2 | Al2O3 | Fe2O3 | CaO | Na2CrO4 | C | |
---|---|---|---|---|---|---|
P1 | 1.5 | 1.5 | 1.5 | 1.5 | 6 | 2/8 |
P2 | 0.9 | 0.6 | 0.6 | 3.9 | 6 | 2/8 |
P3 | 0.6 | 0.18 | 0.12 | 5.1 | 6 | 2/8 |
表4 热力学计算参数
Table 4 Thermodynamic calculation parameters
SiO2 | Al2O3 | Fe2O3 | CaO | Na2CrO4 | C | |
---|---|---|---|---|---|---|
P1 | 1.5 | 1.5 | 1.5 | 1.5 | 6 | 2/8 |
P2 | 0.9 | 0.6 | 0.6 | 3.9 | 6 | 2/8 |
P3 | 0.6 | 0.18 | 0.12 | 5.1 | 6 | 2/8 |
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