Preparation method for sludge ultra-light aggregates

The invention provides a preparation method for sludge ultra-light aggregates. Autoagglutination is carried out by high-content organic matters of sludge, water is absorbed by plant fibers, quick limeand a thickening agent are added for pelletizing in an assisted manner, and pellets are sterilized. Heat permeates step by step from outside to inside in a natural baking and drying mode, and organicmatters and the thickening agent on the outsides of the pellets are baked to evaporate water, and are condensed tightly to form shells to wrap internal water. After the pellets are heated, water in the pellets is evaporated, generated pressure overflows, thus, the whole pellets slightly expand, and are hollow, and the prepared hollow sludge pellets are sprayed with a waterproof agent and then areair-dried to obtain the ultra-light aggregates. The preparation method is simple in steps, convenient to operate and high in practicality. 本发明提供种污泥超轻集料制备方法。利用污泥自身高含量有机物进行自胶结，利用植物纤维进行吸水，添加生石灰、增稠剂辅助成球，并且杀菌消毒。用自然烘烤干燥方式使热量从外到内逐步渗透