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This invention discloses a negative carbon lightweight aggregate based on CO2 mineralization of coal-based solid waste and its preparation method, belonging to the technical field of solid waste resource utilization and low-carbon building materials. The method uses coal-based solid waste such as fly ash and coal slag as main raw materials, introducing uniform micropores through spray granulation with a trace amount of hydrogen peroxide solution. After pre-curing and drying, it is then mineralized and solidified using a low-concentration CO2 atmosphere. This method eliminates the need for cement or other cementing materials, resulting in low cost and no indirect carbon emissions. Furthermore, by synergistically controlling the hydrogen peroxide foaming and CO2 mineralization enhancement processes, the bulk density of the aggregate is significantly reduced; the resulting aggregate has a low bulk density (630~860 kg / m³). 3 With a compressive strength of 4.1~6.0MPa and a water absorption rate of 14~20%, it can meet the requirements of super high-rise buildings, large-span structures, prefabricated components, and the reinforcement and renovation of old buildings, significantly increasing the applicability and economy of coal-based solid waste lightweight building aggregate.

The utility model discloses a tire vulcanization condensation water recycling device, and relates to the technical field of tire vulcanization heat waste recycling. The device structurally comprises a steam trap, a water storage tank, a water pump, a heat exchanger, an overtemperature heat pump, a gas collecting hood, an air feeder and an air supply pipe, the steam trap is arranged on a condensed water discharge port of the vulcanizing machine; the steam trap is communicated with the water storage tank through a first pipeline; a desuperheating water inlet of the heat exchanger is connected with low-temperature desuperheating water, and a desuperheating water outlet of the heat exchanger is connected with the overtemperature heat pump through a third pipeline. According to the utility model, condensed water cooled by the heat exchanger can be used as replenishing water of the cooling tower, and temperature-increased desuperheating water enters the overtemperature heat pump to be reheated, so that high-temperature and high-pressure steam is generated to be used by a vulcanizing machine or other production links needing steam; in addition, in order to recycle hot air released by the vulcanizing machine to the maximum extent, an air feeder on an air collecting hood can be started in winter, and the hot air is conveyed into the overtemperature heat pump to improve the working efficiency of the overtemperature heat pump.