湘潭大学环境与资源学院,湘潭 411105
School of Environment and Resources, Xiangtan University, Xiangtan 411105, China
浓度对铅膏脱硫转化的影响;利用固液多相反应的收缩核模型,分析了反应的动力学过程,并计算了反应的表观活化能及表观反应级数。结果表明:在实验选取的条件范围内,提高反应温度、增大NH
,表观反应级数为0.71,反应过程受内扩散步骤控制。研究结果可为铅膏铵法预脱硫技术能高效、低耗的应用提供参考。
In this study, the lead paste in waste lead-acid batteries was taken as a research object and the experiments on desulfurization and conversion with ammonium bicarbonate (NH
) were conducted. The effects of the stirring speed, reaction temperature and NH
conversion rate in lead paste were investigated. In addition, the reaction kinetics was analyzed by the shrinking core model of liquid-solid multiphase reaction, and the apparent activation energy and reaction order were calculated. The results showed that within the selected conditions, the desulfurization rate and conversion of lead paste could be promoted by increasing the reaction temperature, the concentration of NH
, and the stirring speed. Moreover, the apparent activation energy and reaction order were 9.7 kJ·mol
and 0.71, respectively, and the whole process was controlled by the internal diffusion step. This study provided some references for the high efficient and low consumption application of pre-desulfurization technology with NH
from lead paste.
.
Fitting curve of internal diffusion control equation at different temperature
Fitting curve of chemical reaction control equation at different temperature
Fitting curve of internal diffusion control equation at different concentration
Fitting curve of chemical reaction control equation at different concentration
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