Comparison and experimental demonstration of new technologies for phosphogypsum utilization
In order to make good resource utilization of the phosphogypsum in the factory,the current status of resource utilization of it and the development of phosphogypsum roasting technology which co-produced sulfuric acid are analyzed.Based on the current mainstream process for preparing high-purity calcium oxide and cement clinker,the results of roasting at 1 150℃for 2 hours after adding carbon powder or sulfur to the fresh slag and the stocked one from tailing pond would be compared.The main ingredients of the product are dicalcium silicate and calcium sulfide,with a low calcium oxide content and a maximum sulfur recovery rate of 93.4%.According to the research and the test results,it is recommended to pick the gas sulfur reduction technology developed by Xi'an University of Architecture and Technology(XAUAT)for resource processing of phosphogypsum,which can obtain sulfuric acid and cement clinker products.
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