A method of manufacturing for the environment and human health acceptable construction material from contaminated soil containing water-soluble heavy metal compounds

摘要

According to the invention, a manufacturing process for the environment and health of acceptable, chemically-neutral and inert construction material from contaminated soil, containing a water-soluble environment and harmful chemical compounds based on heavy metals with a substantially exceeding limit is still permitted. In the first step of the process, the preparation of contaminated soil is carried out, which involves the excavation of contaminated soil, the dry separation of particles of contaminated soil by sieving on a fraction below 32 mm and above 32 mm, and then crushing the fraction of the particles above 32 mm to a grain size below 32 mm. In the further step, the mixture of contaminated soil, obtained and prepared in the preceding step, is mixed with iron Fe Fe nanoparticles dispersion. This is followed by the addition of dry bentonite clay in the powder to said mixtures of pre-prepared soil and iron Fe nanoparticles taking into account the content of the clay fraction in the contaminated soil itself, followed by the homogenization of the resulting mixture. Then calcium fly ash (EFP) is added, followed by mixing and, if necessary, addition of water. At the final stage of the process, the incorporation of the obtained material into the layer thickness up to a maximum of 30 cm is made, and the thickness of the resulting material is thickened, so that the density of the built-in layer is on average more than 95% based on the density of the mixture obtained by the modified Proctor process.