Soil stabilization material based on solid waste and bioenzyme, and preparation method thereof

A method for preparing a soil solidification material based on solid waste and bioenzyme, wherein, comprising the following steps:

• S1:
• weighing recycled aggregate 22-35 parts, industrial waste gypsum 25-35 parts, steel slag 20-30 parts, high-calcium fly ash 16-24 parts, the bioenzyme 5-15 parts, diatomite 5-9 parts, attapulgite 5-9 parts, a chitosan-based adsorbent 4-10 parts, a resin-based adsorbent 4-10 parts, an activator 20-30 parts, sodium citrate 1-3 parts, and slaked lime 0.02-0.2 part;
• S2:
• performing a microwave irradiation treatment on the recycled aggregate for 15-24 min with a microwave power density of 1.714 W/cm2, then grinding and carrying out pneumatic separation to obtain an active recycled aggregate and an inert recycled aggregate;
• sieving the inert recycled aggregate to obtain a coarse recycled aggregate and a fine recycled aggregate;
• soaking the fine recycled aggregate in water continuously fed with an industrial waste gas containing carbon dioxide, and continuously stirring until that a color of the fine recycled aggregate is changed from red to yellow;
• then performing dehydration and mixing with the active recycled aggregate to obtain a recycled aggregate powder,
• S3:
• performing fragmentation of the steel slag, and magnetically removing iron in the fragmented steel slag, then sieving the steel slag to obtain a crude steel slag and a fine steel slag;
• carrying out magnetization screening of the crude steel slag to obtain a magnetic crude steel slag and a non-magnetic crude steel slag;
• mixing the non-magnetic crude steel slag with the fine steel slag to process for 1-2 h at 180-240° C. and 1.2-1.8 MPa, and then grinding to obtain a steel slag powder;
• S4:
• mixing the industrial waste gypsum with sodium citrate, then adding water to make a slurry, and ultrasonically vibrating for 5-10 min;
• adding the slaked lime to fully stir, and ultrasonically vibrating for 8-15 min;
• carrying out vacuum filtration, drying at 50-60° C., and then grinding;
• adding into a powder concentrator, and feeding into heated air of the industrial waste gas at 160-300° C.;
• screening out a gypsum powder with a predetermined particle size, and discharging ultrafine powders and light impurities with the heated air from an exhaust outlet of the powder concentrator;
• S5:
• mixing the recycled aggregate powder, the steel slag powder, the gypsum powder with the activator, and stirring for 15-20 min, then calcining at 1200-1350° C. for 1-2 h to obtain a first powder;
• S6:
• dissolving a solution of the bioenzyme in an ethanol solution, adding a powder of diatomite, and stirring for 8-10 min at 50-60° C., then drying and carrying out centrifugal separation to obtain a second powder;
• and
• S7:
• fully mixing the first powder, the second powder, the high-calcium fly ash, attapulgite, the chitosan-based adsorbent and the resin-based adsorbent, and cooling to room temperature to obtain the soil solidification material.