Phosphogypsum sintering-free ceramsite light aggregate and preparation method thereof

Abstract

The invention provides a phosphogypsum sintering-free ceramsite light aggregate. The phosphogypsum sintering-free ceramsite light aggregate comprises a mixture and water, wherein the mixture comprises, by weight percentage, 80-90% of phosphogypsum, 3.3-10% of mineral powder and 6.5-10% of cement, and the weight of the water is 17% of the total weight of the mixture. A method for preparing the phosphogypsum sintering-free ceramsite light aggregate is also provided. The phosphogypsum sintering-free ceramsite light aggregate is prepared by adopting the phosphogypsum as a main material, the cementas an alkaline activator and the mineral powder as an active material through the processes of modification, granulation, curing, crushing, sieving and the like. The produced phosphogypsum sintering-free ceramsite light aggregate can be widely used in highway subgrade materials, C40 and lower grade of concrete, cement concrete blocks and other products, a large amount of phosphogypsum inventoriescan be consumed, waste is turned into treasure, and the phosphogypsum sintering-free ceramsite light aggregate and the method have extremely important significance in saving resources and realizing optimized allocation of the resources and sustainable development.

Description

Technical field [0001] The invention relates to the technical field of engineering materials, in particular to a phosphogypsum-free ceramsite light aggregate and a preparation method thereof. Background technique [0002] Phosphogypsum is an industrial waste produced in the process of decomposing phosphate rock and extracting phosphoric acid by chemical companies with sulfuric acid. The production of 1 ton of phosphoric acid will produce about 5 tons of phosphogypsum. The main chemical component of phosphogypsum is dihydrate gypsum (CaSO4·2H2O), and contains a small amount of phosphoric acid, calcium phosphate, residual acid, soluble P2O5, fluoride, heavy metals, organic matter and other impurities, usually in the form of white or dark gray wet fine powder . According to statistics, as of 2015, my country’s annual emissions of phosphogypsum have exceeded 70 million tons; the cumulative stock of phosphogypsum solid waste in my country exceeded 100 million tons in 2009 and reached...

AI Technical Summary

Problems solved by technology

[0003] Phosphogypsum not only occupies a large amount of land, but also causes serious pollution to soil, water, and air, and even constitutes a safety hazard