助熔成分对工程渣土烧制轻质陶粒性能的影响

Effect of Fluxes on the Performance of Lightweight Ceramsite Prepared by Engineering Muck

目前,利用固体废弃物烧制轻质陶粒的配料设计仍主要依赖于Riley三角形,但由于固体废弃物组成复杂,根据Riley三角形进行陶粒配料设计偶尔会表现出不适用性,而这种不适用性与Riley三角形对原料中复杂的助熔组分不加以区分有关,因此研究不同助熔成分对陶粒烧成过程与性能的影响有重要的意义。本工作设计原料组成在Riley三角形相似的位置,研究了四种常见助熔成分掺量对陶粒烧胀行为、物理性能及晶相组成的影响,并建立三者之间的联系。结果表明,不同助熔成分对陶粒烧胀性能、物理性能及晶相组成有着不同的影响。MgO、CaO及Na_(2)CO_(3)均可明显改善陶粒的烧胀效果,但最佳的掺量及改善效果存在差异:MgO、CaO、Na_(2)CO_(3)掺量(质量分数)分别为1%、1.5%、2%时,分别可制备表观密度为1.38 g/cm^(3)、1.06 g/cm^(3)、0.96 g/cm^(3),单颗粒强度为9.8 MPa、3.9 MPa、4.9 MPa的陶粒。进一步研究表明,这种差异来源于不同助熔成分对晶相组成和液相性质的影响。本工作可为当前工业固废烧制陶粒的配料设计提供一定的参考。

Currently,lightweight aggregate(LWA)is mainly designed empirically based on the Riley scheme.Due to the complex composition of different solid waste,the proportioning design of ceramsite based on Riley triangle occasionally shows inapplicability.Therefore,it is necessary to study the influence of different flux on the performance of LWA.In this study,the compositions of the raw materials with different fluxes were designed in similar locations in Riley triangle.Different fluxes had different effects on the sintering and swelling properties,physical properties,and crystal phase composition of LWA.The effects of four flux type and dosages on the swelling behavior,physical properties and crystal phase composition of the LWA were studied,while conclusively bridging them.The results showed that with MgO,CaO and Na_(2)CO_(3)content of 1wt%,1.5wt%and 2wt%,the apparent density of obtained LWA was 1.38 g/cm^(3),1.06 g/cm^(3)and 0.96 g/cm^(3),and the strength was 9.8 MPa,3.9 MPa and 4.9 MPa,respectively.Further research showed that the difference came from the effects of different flux components on crystal phase composition and liquid phase properties.This work can provide some reference for the proportioning design of ceramsite from solid waste.