ABSTRACT

In order to solve problems of land occupation and environment damage resulted from massive municipal solid waste incineration bottom ash sludge (MSWI-BAS), sintered lightweight aggregates (LWA) were prepared from MSWI-BAS. Additives are of great significance for the preparation of high-performance LWA and the utilization of MSWI-BAS resources, so their effect on properties of LWA was investigated. The results showed that when the content of water glass was 20%, compressive strength of LWA reached a maximum of 8.4 MPa, and 1-hr water absorption reached a minimum of 5%. The reason was that the addition of water glass brought a lot of Na⁺ and Si(OH)₄, and the internal crystals of water glass were converted into rod-shaped zeolite crystals, thereby forming a high-density structure. The addition of coal powder led to the formation of gas in LWA, thus reducing the density of LWA. At the same time, it was also conducive to earlier generation of liquid phase in LWA, making its internal structure dense. When the content of coal powder was 5%, 15%, and 20%, the modification effect was better, and compressive strength of LWA was larger, about 4 MPa. Additives are of great significance for the preparation of high-performance LWA and the utilization of MSWI-BAS resources.

Implications: In this study, we have prepared LWA with MSWI-BAS. At the same time of X-ray diffractometer (XRD) and FT-IR analysis of raw materials, we also investigated effect of water glass and coal powder on characteristics (particle density, 1-hr water absorption, and compressive strength) of lightweight aggregates, and good results were obtained. For explanations, several characterizations were carried out, such as XRD and SEM. The sludge disposal problem is reduced. It opens up a new way for the utilization of solid waste resources. In addition, it meets with the concept of green development of building materials and makes the production of LWA have a broader development prospect.

摘要

为解决大量生活垃圾焚烧底灰污泥（MSWI-BAS）造成的占地和环境破坏问题，以MSWI-BAS为原料制备了烧结轻骨料（LWA）。添加剂对制备高性能LWA和利用MSWI-BAS资源具有重要意义，因此研究了它们对LWA性能的影响。结果表明，当水玻璃含量为20%时，LWA的抗压强度最高可达8.4 MPa，1小时吸水率最低可达5%。原因是水玻璃的加入带来了大量的 Na ⁺和 Si(OH) ₄，水玻璃的内部晶体转变为棒状沸石晶体，从而形成高密度结构。煤粉的加入导致LWA中气体的形成，从而降低了LWA的密度。同时，也有利于LWA中液相的较早产生，使其内部结构致密。当煤粉含量为5%、15%、20%时，改性效果较好，LWA的抗压强度较大，约为4 MPa。添加剂对于高性能LWA的制备和MSWI-BAS资源的利用具有重要意义。

启示：在本研究中，我们准备了带有 MSWI-BAS 的 LWA。在对原料进行 X 射线衍射仪 (XRD) 和 FT-IR 分析的同时，我们还研究了水玻璃和煤粉对轻集料特性（颗粒密度、1 小时吸水率和抗压强度）的影响，并取得了良好的效果。为了解释，进行了一些表征，例如 XRD 和 SEM。污泥处理问题减少。开辟了固废资源化利用的新途径。此外，符合建材绿色发展的理念，使轻质瓦的生产具有更广阔的发展前景。