煤气化渣是煤化工领域的一种固废,其大量排放对自然环境造成很大压力,对其进行资源化利用尤为重要。本研究基于煤气化渣结构特殊、比表面积较大的特点,研究了不同吸附条件对煤气化渣吸附磷酸根的影响,同时研究了煤气化渣对磷酸根的解吸及再吸附特性。结果表明,煤气化渣对磷酸根的吸附符合Langmuir等温吸附模型和拟二级动力学反应模型。在pH=7、投料量为2.5 g/L、温度为30 ℃、时间为480 min的条件下,其Langmuir饱和吸附量达到3.998 4 mg/g。此外,煤气化渣对磷酸根还具有较好的解吸效率和再吸附能力。研究表明煤气化渣具有作为磷肥缓释剂的潜力。

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.