School of Environment, Nanjing Normal University, Nanjing, People's Republic of China.
Jangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing Normal University, Nanjing, People's Republic of China.
J Air Waste Manag Assoc. 2021 Aug;71(8):1013-1024. doi: 10.1080/10962247.2021.1918288. Epub 2021 May 18.
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), 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.: 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.
为了解决大量城市固体废物焚烧底灰渣（MSWI-BAS）占地和环境污染问题，采用 MSWI-BAS 制备了烧结轻集料（LWA）。添加剂对制备高性能 LWA 和利用 MSWI-BAS 资源具有重要意义，因此研究了其对 LWA 性能的影响。结果表明，当水玻璃含量为 20%时，LWA 的抗压强度达到最大值 8.4MPa，1 小时吸水率达到最小值 5%。原因是水玻璃的加入带来了大量的 Na 和 Si(OH)，并且水玻璃的内部晶体转化为棒状沸石晶体，从而形成了高密度结构。煤粉的加入导致 LWA 中形成气体，从而降低了 LWA 的密度。同时，它还有利于 LWA 中较早地生成液相，使其内部结构致密。当煤粉含量为 5%、15%和 20%时，改性效果较好，LWA 的抗压强度较大，约为 4MPa。添加剂对制备高性能 LWA 和利用 MSWI-BAS 资源具有重要意义。：在本研究中，我们使用 MSWI-BAS 制备了 LWA。在对原材料进行 X 射线衍射仪（XRD）和傅里叶变换红外光谱（FT-IR）分析的同时，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，取得了良好的效果。对于解释，进行了 XRD 和 SEM 等几种表征。减少了污泥处置问题。为固体废物资源的利用开辟了新途径。此外，它符合建筑材料绿色发展的理念，使 LWA 的生产具有更广阔的发展前景。
