Feasibility analysis for decomposition of phosphogypsum in cement precalciner

Abstract

In recent years, many scholars had put forward a new idea in which the New Suspension Preheater Cement Production Technique (or NSP) would be used to decompose phosphogypsum to produce vitriol and cement. In this article, combining the characteristic of precalciner in NSP technique and the thermal analysis for phosphogypsum, the adaptability of decomposition temperature of phosphogypsum for the preheated calciner was researched, as well as the relationship between decomposition efficiency of phosphogypsum and the felt block characteristic of the kiln system. Results showed that even in reduction atmosphere, the decomposition temperature of phosphogypsum is still more than 12008C, it is difficult to realize this new process with NSP cement production technique.

Thermal Study of Tunisian Phosphogypsum for Use in Reinforced Plaster

“…Although, the best option for dealing with the PG problem appears to be the commercial use of this material in the agriculture (e.g. amelioration of acid soils) and construction industry (building/ road construction), only a relative small portion of the PG produced (14%) is reprocessed, a significant part was dumped into water bodies (28%) and the largest amount of the material was accumulated in large sludge ponds and retaining stockpiles [3,4].…”

Liquid and Solid Compound Granulated Diurea Sulfate-Based Fertilizers for Sustainable Sulfur Source

“…It is produced via an exothermal reaction (reaction ) at 87–95 °C via a reaction between fluorapatite and H 2 SO 4 and accumulates in tremendous amounts as waste. Approximately, 30 million tons is produced annually in the United States alone, and up to 300 million tons is produced annually worldwide. , Its sustainable reuse is of tremendous importance and could potentially serve as an alkaline calcium source to bind diurea sulfate into the granule. A slurry containing 5%, 10%, and 15% (wt) of phosphogypsum with diurea sulfate was prepared and supplied into the granulator, whereas the granulator inclination angle and moisture content were systematically adjusted.…”