Current status and challenges in co-production of sulphuric acid and Portland cement from phosphogypsum
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Phosphogypsum (PG) is a by-product of the wet-process phosphoric acid industry. Co-production process of Portlandcement and sulfuric acid from phosphogypsum can realize its resource utilization, sulfur cycle and reduce carbon dioxideemission. The decomposition temperature of gypsum can be reduced using coal as reducing agent, which is beneficial toreduce energy consumption. It will be interesting to produce high-strength-low-calcium Portland (LCP) cement by usingphosphogypsum as raw materials. The early strength of the cement can be improved by stabilizing the high temperaturestructure of dicalcium silicate, changing the hydration environment and adopting carbonation curing. The cement can bemanufactured by the equipment of Portland cement industry. The sulfuric acid can be produce with the SO2 flue gases byconventional acid manufacturing process. The CO2 emission is 446.4 Kg per tonne cement by using PG, which can realizesustainable development of phosphorus chemical and cement industry.S
Abstract
Phosphogypsum (PG) is a by-product of the wet-process phosphoric acid industry. Co-production process of Portlandcement and sulfuric acid from phosphogypsum can realize its resource utilization, sulfur cycle and reduce carbon dioxideemission. The decomposition temperature of gypsum can be reduced using coal as reducing agent, which is beneficial toreduce energy consumption. It will be interesting to produce high-strength-low-calcium Portland (LCP) cement by usingphosphogypsum as raw materials. The early strength of the cement can be improved by stabilizing the high temperaturestructure of dicalcium silicate, changing the hydration environment and adopting carbonation curing. The cement can bemanufactured by the equipment of Portland cement industry. The sulfuric acid can be produce with the SO2 flue gases byconventional acid manufacturing process. The CO2 emission is 446.4 Kg per tonne cement by using PG, which can realizesustainable development of phosphorus chemical and cement industry.S