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The application relates to the field of cement material preparation, and particularly discloses a preparation method of an early-strength carbon-reduction light aggregate cement-based material, which comprises the following steps: (1) mixing emulsified asphalt, a silane coupling agent and polyethylene glycol powder to form a coating agent. Then, the coating agent is added to volcanic light aggregate while stirring, and after mixing, recycled concrete powder is added to coat the surface of the aggregate. After solidification, the excess powder is removed through screening to obtain pretreated light aggregate. (2) After the pretreated light aggregate is sprayed with water and moistened, the light aggregate is placed in a sealed container, carbon dioxide is introduced, and heating and insulation are performed, so that the reprocessed light aggregate is obtained. (3) cement, sand fine aggregate, the pretreated light aggregate, an anti-shrinkage agent, glass powder and a water reducing agent are uniformly mixed as raw materials, and then water is added and uniformly stirred, so that the cement-based material is obtained. The cement-based material not only has good fluidity and early strength, but also can prevent mechanical strength deterioration caused by later drying shrinkage.

The present application relates to the field of freeze-dried preparations of leeches, and provides a freeze-dried powder containing multiple active enzymes and a preparation method thereof, to solve the problem that the prior art cannot simultaneously ensure the release of active ingredients and the maintenance of the stability of active ingredients, comprising the following steps: S100, cooling leeches to obtain freeze-dried leeches; S200, putting the freeze-dried leeches into a solution system, crushing, centrifuging, and taking the supernatant; the pH value of the solution system is 6.5-8.5; the solution system at least comprises water; the crushing speed is 150-250 r / min, and the time is 5-8 min; S300, after the supernatant is separated and purified, freeze-drying is performed to obtain the freeze-dried powder of leeches. The present application adopts a freeze-crushing process, and after freezing, not only can the crushing operation be simply realized, but also the loss of active ingredients caused by high temperature can be reduced by utilizing the crushing process at low temperature of raw materials.