Inorganic Chemicals Industry >
Study on adsorption and desorption of phosphate by coal gasification slag
Received date: 2020-08-25
Online published: 2021-02-06
Coal gasification slag is a kind of solid waste in the field of coal chemical industry,the large amount of coal gasifi-cation slag discharge causes great pressure on the natural environment so it is particularly important to resource-based utiliza-tion of it.Based on the special structure and large specific surface area of coal gasification slag,the influence of coal gasifica-tion slag on the adsorption performance of phosphate under different adsorption conditions was studied,and the desorption and re-adsorption characteristics of coal gasification slag on phosphate were also researched.Results showed that the adsorp-tion of phosphate by coal gasification slag conforms to the Langmuir isothermal adsorption model and the pseudo-second-order kinetic reaction model.Under the adsorption conditions,such as pH of 7,feed amount of 2.5 g/L,temperature of 30 ℃ and time of 480 min,the saturated adsorption amount of Langmuir reached 3.998 4 mg/g.In addition,the coal gasification slag also has better desorption efficiency and re-adsorption capacity for phosphate.The study results showed that the coal gasification slag has the potential to be used as a sustained release agent for phosphate fertilizer.
Key words: coal gasification slag; phosphate; adsorption; desorption
Darui Liu , Dandan Zhu . Study on adsorption and desorption of phosphate by coal gasification slag[J]. Inorganic Chemicals Industry, 2021 , 53(2) : 84 -87 . DOI: 10.11962/1006-4990.2020-0136
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