The cement industry is an integral part of our history. Since its inception, Sogedir Srl has developed and founded its core business on the recovery of waste materials and by-products from industrial production, such as chemical gypsum, blast furnace slag and coal ash, enhancing them as substitutes for raw materials in the industry of concrete.
Over the years, we have founded and cultivated solid relationships with the largest Italian cement groups, placing at the center of our priorities seriousness, reliability, care for the selection of materials and the utmost attention to the regulatory aspects that govern the recovery of special non-hazardous waste in the production of cement.
FOUNDRY WASTE MOULDS & CORES
- EER 100908 – Foundry waste moulds and cores come from ferrous metal foundries, and represent the exhausted sands no longer usable for casting molds. These contain SiO2 in a percentage of 70% therefore suitable for use in raw materials for the production of cement, thanks to their chemical composition they are suitable for correcting the silicic modulus, contributing significantly to the reduction of the use of natural silica otherwise coming from mining activities.
LAMINATION FLAKES
- EER 100210 – The lamination flakes comes from the production and processing of steel specifically from rolling and drawing activities, thanks to its 95% iron oxide content it is used as a corrective in raw materials for the production of cement in place of iron ore coming from natural quarries.
WHITE SLAG FROM STEEL MILL
- EER 100202 – White slag is a silica-based by-product of the steel industry. The most interesting feature for the cement production cycle is the fact that this material has already given up its share of CO2 emissions, an aspect which therefore allows the production of clinker to be increased with the same emissions.
GRANULATED BLAST FURNACE SLAG
- High quality blast furnace slag. Blast furnace slag (or blast furnace slag) is a by-product of the cast iron production process, during which large quantities of slag of composition not far from that of Portland cement are formed. The slag acquires hydraulic characteristics if at the exit from the blast furnace it is cooled abruptly and transformed into porous granules with a vitreous structure (amorphous silica) called granular slag.
ASH FROM WOODY BIOMASS
- Wood biomass ashes CER 100101 & CER 100103 from waste-to-energy plants with virgin woody biomass (wood chips) represent specifically the heavy grid ash, not dangerous, containing a percentage of silica, iron oxides and aluminum used as a corrective of raw materials for production of cement, contributing significantly to the reduction of the use of natural silica otherwise coming from mining activities.
FLY ASHES
- EER 100103 – Their chemical composition is similar to that of a natural pozzolan of volcanic origin, which is why they are used in the last phase of cement production in addition to clinker, improving the workability of the concrete, compressive strength and durability. The high fineness and spheroidal shape of the ash particles contribute to giving fluidity to the concrete casting and therefore to its workability and pumpability, obtaining more homogeneous mixtures and more accurate surface finishes. Furthermore, if used in raw materials, thanks to their chemical composition they are suitable for correcting the silica modulus, contributing significantly to the reduction of the use of natural silica otherwise coming from mining activities.
SYNTHETIC GYPSUM
- Synthetic gypsum from basic chemical industry, obtained from the reaction between dried fluorite and sulfuric acid during the production of hydrofluoric acid. Composed of a very high quantity of SO3, thanks to the high content of anhydrite and the minimum concentration of impurities, it is an ideal product for the cement industry, where it is used to regulate the laying time of this. The size of the gypsum particulate can be agreed with the destination plants according to their needs.
HEAVY ASH FROM RSU/CDR
- EER 190112 – Bottom ash from RSU/CDR from waste-to-energy plants fed by MSW or RDF containing percentages of SiO2, iron oxides and aluminum oxides used as a corrective to raw materials for the production of cement, significantly contributing to the reduction of ‘use of natural silica otherwise coming from mining activities.
SYNTHETIC GYPSUM FROM FLUE GAS DESULFURIZATION
- EER 100105 – Synthetic gypsum from fumes desulphurization from the treatment of gaseous effluents and then from the abatement of the SOx present in the combustion fumes of coal-fired thermoelectric plants. They have a high CaSo4 content of over 90%, and are therefore used to replace natural quarry gypsum, limiting excavations and the opening of new quarries.
SRF – Solid Recovered Fuels
- EER 191210 – For Solid Recovered Fuels (CSS) we mean solid fuels produced from non-hazardous waste, both of urban and special origin (including industrial waste) that comply with the characteristics identified by the technical standards UNI CEN / TS 15359 and subsequent amendments. The use of CSS in co-combustion instead of pet-coke, a waste by-product of refineries, is a common practice only for some cement plants in Italy, although Europe recommends it as one of the best technologies available (Bat, Best available technology). Thanks to the “ rigorous ” selection of waste, its use generates a clear improvement in emissions and, moreover, thanks to the high temperatures at which the furnaces work, the possibility of dioxin formation in the chimneys is effectively excluded. could generate at lower temperatures. At the base of a waste management cycle there is the selection of the materials to be valorised, and the cement factories become the finalization point of the remaining dry fraction, otherwise destined for landfill. This reduces the costs of disposal for local communities, with a benefit on the waste tariff. In this way, a path of transparency and controllability of industrial cycles is traceable. The production of CSS allows the recovery of material to be sent for recycling from unsorted waste, helping to increase the quantity of material to be sent for recovery. It is therefore a cycle, that of the CSS, which integrates perfectly with high levels of separate waste collection with evident synergies between the recovery of material and that of energy.