电石渣煅烧过程中气态污染物释放特性
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摘要
为研究电石渣煅烧过程中有害气体的释放特性,采用FactSage7.0热力学软件计算了体系升温过程中有害组分碳、氟、磷、硫的迁移转化过程。结果表明,煅烧温度达到600℃时,电石渣中的氟以气态氟化氢的形式开始释放,且氟化氢释放量随温度的升高而增大,其余氟元素由固相4CaO·2SiO_2·CaF_2逐渐向固相11CaO·7Al_2O_3·CaF_2和渣相氟化钠、氟化钙、氟化镁转变。500~1 000℃区间内,固相硫化钙可水解释放微量含硫有害气体(硫化氢)。整个煅烧温度区间内(50~1 000℃),所有磷元素未进入气相,但体系中的含碳气体却始终存在;其中,二氧化碳是反应过程的中间产物,超过750℃时,一氧化碳气体释放量的增加已不再明显。
In order to explore the release characteristics of harmful gases during calcining the carbide slag,the migration and transformation of the C-,F-,P-,and S-containing species in the heating process were calculated by using Fact Sage 7.0 thermochemical software.The results showed that the HF started to release when the calcination temperature reached 600 ℃,and the release amounts of HF increased as temperature rose.Meanwhile, the other F state of carbide slag were gradually transformed from the 4 CaO·2 SiO_2·CaF_2(solid) to the 11 CaO·7Al_2O_3·CaF_2(solid),Na F(slag),CaF_2(slag) and MgF_2(slag).A small amount of H_2S was produced by Ca S hydrolysis in the temperature range of 500 ~1 000 ℃.In the temperature of 50 ~1 000 ℃,all P was not present in the gas phase,but the C-containing gases were always formed.CO_2 was the intermediate product in the reaction process.The increase of release amounts of CO was no longer obvious at temperature above 750 ℃.
In order to explore the release characteristics of harmful gases during calcining the carbide slag,the migration and transformation of the C-,F-,P-,and S-containing species in the heating process were calculated by using Fact Sage 7.0 thermochemical software.The results showed that the HF started to release when the calcination temperature reached 600 ℃,and the release amounts of HF increased as temperature rose.Meanwhile, the other F state of carbide slag were gradually transformed from the 4 CaO·2 SiO_2·CaF_2(solid) to the 11 CaO·7Al_2O_3·CaF_2(solid),Na F(slag),CaF_2(slag) and MgF_2(slag).A small amount of H_2S was produced by Ca S hydrolysis in the temperature range of 500 ~1 000 ℃.In the temperature of 50 ~1 000 ℃,all P was not present in the gas phase,but the C-containing gases were always formed.CO_2 was the intermediate product in the reaction process.The increase of release amounts of CO was no longer obvious at temperature above 750 ℃.
引文
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[2]Liu F,Zeng L K,Cao J X,et al.Preparation of ultra-light xonotlite thermal insulation material using carbide slag[J].Journal of Wuhan University of Technology:Mater.Sci.,2010,25(2):295-297.
[3]Li F J,Li H Q,Wang L G,et al.Waste carbide slag as a solid base catalyst for effective synthesis of biodiesel via transesterification of soybean oil with methanol[J].Fuel Processing Technology,2015,131:421-429.
[4]Li Y J,Su M Y,Xie X,et al.CO2capture performance of synthetic sorbent prepared from carbide slag and aluminum nitrate hydrate by combustion synthesis[J].Applied Energy,2015,145:60-68.
[5]Bale C W,Bélisle E,Chartrand P,et al.Fact Sage thermochemical software and databases,2010—2016[J].Calphad,2016,54:35-53.
[6]张晨,刘世洲,王文忠.Ca O-Si O2-Ca F2三元渣系的挥发率[J].钢铁研究学报,1998,10(6):16-19.
[7]张妙鹤,唐安江,汤正河,等.四氯化硅和四氟化硅的研究比较[J].现代化工,2012,32(6):34-38.
[8]杨恩林,张杰.黄磷渣制备多孔陶瓷的研究[J].中国陶瓷,2008,44(5):35-37.
[9]Li P S,Li H Y,Jie W Q.Stabilization of lanthanum sulfides with different dopants[J].Journal of Wuhan University of Technology:Materials Science,2012,27(3):529-533.