Method for making regenerated soil material for the production of a structural unit, the structural unit made from the regenerated soil material, and method for recycling the structural unit
A method for making a regenerated soil material for the production of a structural unit includes the steps of: a) obtaining a raw soil material containing aluminum and silicon from a natural source; b) adding an active mineral containing aluminum and silicon to the raw soil material; c) cleaving the raw soil material and the active mineral in a base so as to dissociate aluminum monomer and silicon monomer out of the mixture of the raw soil material and the active mineral; and d) polymerizing the aluminum monomer and the silicon monomer so as to form silicon-oxy tetrahedron and aluminum-oxy tetrahedron in the mixture.
1. A method for making a regenerated soil material for the production of a structural unit, comprising the steps of:
a) calcining a soil at an elevated temperature;
b) adding an active mineral containing aluminum and silicon to the soil calcined in the step a), wherein the active mineral is selected from the group consisting of fly ash, slag powder, zeolite powder and silica fume;
c) adding to the soil and the active mineral a sodium hydroxide solution having a concentration ranging from 5 to 10 M; and
d) adding to the mixture of the soil, the active mineral, and the sodium hydroxide solution a polymerizing medium selected from the group consisting of sodium silicate and potassium silicate.
2. The method as claimed in claim 1 , wherein the calcining step is conducted at a temperature of 700° C. for 4 hours.
3. A structural unit, comprising a regenerated soil material made by the steps of:
a) calcining a soil at an elevated temperature;
b) adding an active mineral containing aluminum and silicon to the soil calcined in the step a), wherein the active mineral is selected from the group consisting of fly ash, slag powder, zeolite powder and silica fume;
c) adding to the soil and the active mineral a sodium hydroxide solution having a concentration ranging from 5 to 10 M; and
d) adding to the mixture of the soil, the active mineral, and the sodium hydroxide solution a polymerizing medium selected from the group consisting of sodium silicate and potassium silicate.
4. A method for recycling the structural unit of claim 3 , comprising the steps of:
a) breaking and milling the structural unit to form a recycled soil material;
b) calcining the recycled soil material at an elevated temperature;
c) adding an active mineral containing aluminum and silicon to the recycled soil material calcined in the step b), wherein the active mineral is selected from the group consisting of fly ash, slag powder, zeolite powder and silica fume;
d) adding to the recycled soil material and the active mineral a sodium hydroxide solution having a concentration ranging from 5 to 10 M; and
e) adding to the mixture of the recycled soil material, the active mineral and the sodium hydroxide solution a polymerizing medium selected from the group consisting of sodium silicate and potassium silicate.
5. The method as claimed in claim 4 , wherein the recycled soil material has a particle size less then 0.2 mm.