Carbon sequestration lightweight aggregate and preparation method thereof

The invention provides a preparation method of carbon sequestration lightweight aggregate. The method comprises the following steps: 1) drying and grinding powdery solid waste to obtain active micro powder of 100-200 meshes; 2) mixing the active micro powder with a cementing material to obtain a material; 3) mixing an alkaline solution with the materials, and granulating to obtain a recycled aggregate green body; 4) performing mineralization maintenance on the recycled aggregate green body in kiln flue gas containing CO2; the powdery solid waste comprises one or more selected from granite powder, copper tailings, tungsten tailings, molybdenum tailings, fly ash and construction waste residual mud. According to the method provided by the invention, the powdery solid waste is used for preparing the recycled aggregate, so that CO2 is absorbed and solidified while the solid waste is consumed, and the method has remarkable social and environmental benefits. 本发明提供一种固碳轻骨料的制备方法。该方法包括：1)将粉状固废进行干燥、粉磨处理，得到100～200目的活性微粉；2