There is a huge stock of industrial solid waste piles such as phosphogypsum (PG), desulfurization ash (DA), and waste soil (WS) in China, and their utilization rate is insufficient. These have potential risk for environmental safety due to pollutants contained in them. In this study, after proportioning design, raw material pretreatment, bubble regulation and multi-temperature section maintenance process, successfully prepared a high blending solid waste based functional prefabricated autoclaved aerated concrete slabs (FPAS) with excellent functional performance, and the optimal ratio of each raw material is PG: WS: DA: cement: lime = 8:50:20:10:12, and the dry mass ratio is up to 75%, the compressive strength of the slabs is up to 5.2 MPa, the standard dry density is 606 kg/m, the dry shrinkage value is 0.36 mm/m, and the post-freezing strength is 4.0 MPa, which is in line with the basic requirements in the standard , and at the same time, its fire-resistant integrity is qualified for 240 min, and the coefficient of thermal conductivity is 0.15w(m.k), airborne sound-weighted sound insulation is 46 dB, also can show different functional characteristics. In order to investigate the environmental safety of heavy metals (HMs) in the slabs, the simulation experiment of HMs leaching from outdoor stacking of slabs was carried out. The results show that the HMs in the slabs do not pose obvious risks to the natural environment and human body, but three of the characteristic HMs, Cr, Cd and Hg, have significant leaching patterns, which can be expressed by a second-order kinetic model. Finally, the life cycle assessment and cost analysis of the high blending PG-DA-WS based FPAS and the conventional aerated slabs were carried out. The main environmental damage category of the high blending PG-DA-WS based FPAS is land ecological risk, and it has obvious environmental and economic benefits compared with the conventional aerated slabs.

中文翻译：

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高掺合磷石膏-脱硫灰废土基功能性预制蒸压加气混凝土板的制备及性能

我国磷石膏（PG）、脱硫灰（DA）、废土（WS）等工业固体废物堆存量巨大，利用率不足。由于其中含有污染物，这些产品存在潜在的环境安全风险。本研究通过配比设计、原料预处理、气泡调节和多温段养护工艺，成功制备出具有优异功能性能的高掺合固废基功能性预制蒸压加气混凝土板（FPAS），并确定了各组分的最佳配比。原料为PG:WS:DA:水泥:石灰=8:50:20:10:12，干质量比达75%，板坯抗压强度达5.2MPa，标准干密度为606 kg/m，干收缩值为0.36 mm/m，冻后强度为4.0 MPa，符合标准中的基本要求，同时其耐火完整性为240min合格，导热系数0.15w(mk)，空气声计权隔声量46dB，也能表现出不同的功能特性。为了考察板坯中重金属（HMs）的环境安全性，开展了室外堆放板坯中重金属浸出的模拟实验。结果表明，板坯中的重金属对自然环境和人体不会造成明显的风险，但特征重金属Cr、Cd和Hg中的三种具有显着的浸出模式，可以用二级动力学表示模型。最后，对高掺合PG-DA-WS基FPAS和传统加气板进行了生命周期评估和成本分析。高掺量PG-DA-WS基FPAS的主要环境损害类别是土地生态风险，与传统加气板相比具有明显的环境效益和经济效益。