New Technology for Producing Sulfuric Acid and Cement Through Pre Decomposition Kiln Decomposition of Phosphogypsum
This article introduces the technical characteristics of suspended preheater pre decomposition(NSP)with decomposition furnace.This technology replaces traditional coke with CO and H2 as reducing agents,which has the advantages of low decomposition temperature,low energy consumption,and high concentration of SO2 in kiln gas.Using a single unit ϕ4 m×A 75 m NSP kiln with a three-stage preheater and drying process can co-produce 1.0 kt/d sulfuric acid and 1.08 kt/d cement clinker.The energy consumption of 1 kg of product is 2700 kJ.In areas where the mass fraction of silica in phosphogypsum is less than 9%,this technology can simultaneously produce high-quality sulfuric acid and qualified cement clinker products,with good economic and social benefits.
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