Separated dual system and production method for preparing sulfuric acid and co-producing cement from phosphogypsum

• Main Authors: LONG QUANMING, LI FUZHOU, ZHAO QINGLIN, ZHOU SHANGQUN, ZHOU MINGKAI
• Format: Patent
• Language: Chinese; English
• Published: 22.07.2022
• Subjects: ARTIFICIAL STONE; CEMENTS; CERAMICS; CHEMISTRY; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; COMPOUNDS THEREOF; CONCRETE; INORGANIC CHEMISTRY; LIME, MAGNESIA; METALLURGY; NON-METALLIC ELEMENTS; REFRACTORIES; SLAG; TREATMENT OF NATURAL STONE

The invention discloses a separated dual system and a production method for preparing sulfuric acid and co-producing cement from ardealite. The separated dual system comprises a phosphogypsum pyrolysis acid-making system and a cement clinker calcining system. The separated phosphogypsum pyrolysis device is adopted, and the phosphogypsum pyrolysis sulfuric acid preparation system and the cement clinker calcination system are separated, so that an operator can adjust working conditions at any time according to different pyrolysis environments required by phosphogypsum and other cement raw materials; the risk of crust blockage of the decomposition furnace caused by a large amount of liquid phase generated by overhigh pyrolysis temperature required by the phosphogypsum is avoided, and the quality of cement clinker is ensured while the decomposition rate of the phosphogypsum is improved; meanwhile, the universality of the ardealite is improved, and the concentration of SO2 in the obtained acid-making flue gas is n