To solve the disposal problem of municipal solid waste incineration bottom ash sludge (MSWI-BAS), using it as the main raw material to prepare lightweight aggregates (LWA) for resource utilization. Sintering is an important process to achieve the desired microstructure and material properties. This paper investigates the characteristics of LWA affected by single factor of sintering mechanism (sintering temperature, heating rate and soaking time). Results show that sintering temperature increased from 1130°C to 1160°C caused high-density microstructure materials gradually formed in LWA, leading to particle strength increased from 0.1 MPa to 3.64 MPa, particle density showed an overall upward trend, reaching a maximum of 916 Kg/m3 at 1160°C, and 1 h water absorption reduced from 68% to 25%. The heating rate of 15 K/min was beneficial to the formation of dense phase structure which could increase the particle strength, and the water absorption rate reached the lowest at this time, while the particle density was less affected by heating rate. When soaking time extended from 5 min to 20 min, particle strength and compressive density were gradually increased, and 1 h water absorption showed an overall downward trend, indicating that a longer soaking time was not conducive to the retention of pores. This study demonstrates that the utilization of MSWI-BAS to make high-performance LWA is feasible, along with the preferable environmental and economic benefits.Implications: MSWI-BAS were selected to produce lightweight aggregate (LWA), so that the sludge disposal problem is reduced. The effects of sintering temperature, heating rate and soaking time on the characteristics of LWA were investigated. Compact glass structures are formed at 1150°C and 1160°C which greatly improve the strength. The heating rate has little influence on the physical properties of LWA products. The particle density of LWA increases after the sintering soaking time reaches 15 minutes.

中文翻译：

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从城市固体废物焚烧底灰污泥（MSWI-BAS）获得的轻质骨料及其特性受烧结机理的单一因素影响。

为了解决城市生活垃圾焚烧底灰污泥（MSWI-BAS）的处置问题，以其为主要原料制备轻质骨料（LWA）以进行资源利用。烧结是获得所需微结构和材料性能的重要过程。本文研究了受烧结机理单因素（烧结温度，加热速率和保温时间）影响的LWA的特性。结果表明，烧结温度从1130°C升高到1160°C，导致高密度微结构材料逐渐在LWA中形成，导致颗粒强度从0.1 MPa增加到3.64 MPa，颗粒密度总体呈上升趋势，最高达到916。 1160°C下的Kg / m3和1小时的吸水率从68％降低到25％。15 K / min的加热速率有利于形成致密相结构，可以提高颗粒强度，此时吸水率达到最低，而颗粒密度受加热速率的影响较小。当浸泡时间从5分钟延长到20分钟时，颗粒强度和压缩密度逐渐增加，并且1 h吸水率显示总体下降趋势，表明更长的浸泡时间不利于孔的保留。这项研究表明，利用MSWI-BAS制备高性能LWA是可行的，同时具有较好的环境和经济效益。含义：选择MSWI-BAS来生产轻质骨料（LWA），因此污泥处置问题不容忽视。减少。烧结温度的影响 研究了加热速率和保温时间对LWA特性的影响。致密的玻璃结构在1150°C和1160°C形成，极大地提高了强度。加热速率对LWA产品的物理性能影响很小。烧结均热时间达到15分钟后，LWA的颗粒密度增加。