The invention discloses lightweight energy-saving fireproof soil-based foam lightweight soil, which is prepared from the following raw materials in parts by weight: 20 to 30 parts of
magnesium slag powder, 20 to 30 parts of granulated
blast furnace slag powder, 15 to 25 parts of iron tailing
powder, 40 parts of soil, 6 parts of water glass, 10 parts of desulfurized
gypsum, 0.28 to 0.43 part of polycarboxylate
superplasticizer, 57 to 75 parts of water, 0.76 to 1.00 parts of AOS
foaming agent, 0.16 to 0.26 part of HPMC foam stabilizer and 0.16 to 0.26 part of
calcium stearate foam stabilizer. The preparation method comprises the following steps: 1, mixing and stirring
dry powder; 2, preparing
slurry; 3, preparing soil-based foam light soil; and 4, molding and curing in a mold. According to the invention, a three-dimensional skeleton dense structure is constructed by optimizing the composition and proportion of the raw materials, the soil-based foam light soil with low heat
conductivity,
low density and high strength is obtained, and the soil-based foam light soil is suitable for the fields of roof heat preservation, wall body, roadbed filling,
abutment back, foundation pit, pipeline backfilling and
landscape engineering.