Abstract
The use of phosphogypsum to prepare phosphorus building gypsum (PBG) is of great value to the resource utilization of phosphogypsum. In this study, PBG was ball-milled to obtain phosphorus building gypsum with good performance, which can meet the requirements of the Chinese standards for first-class building gypsum. Meanwhile, the changes of net slurry physical properties, mechanical properties, and particle size parameters of PBG under different treatment times were analyzed. With the increase of ball milling time, the particle size of PBG decreased rapidly and then stabilized, and the specific surface area gradually increased and then started to rise back. Ball milling can significantly reduce the standard consistency water requirement of phosphogypsum, resulting in a shorter setting time and higher strength of phosphogypsum. In the fixed water consumption test, the effect of ball milling time on the performance of phosphogypsum was small. Compared with sieving, washing, aging, and other means of PBG treatment, ball milling has the advantages of simplicity, environmental protection, and low cost, and it has some practical significance in production.
Highlights
Phosphogypsum is a byproduct of the industrial production of phosphoric acid, which is mainly composed of calcium sulfate dihydrate and contains phosphorus, fluorine, organic matter, and other impurities [1]
As the ball milling time increases, the water consumption of normal consistency decreases to a minimum value and increases
When the ball milling time is
Summary
Phosphogypsum is a byproduct of the industrial production of phosphoric acid, which is mainly composed of calcium sulfate dihydrate and contains phosphorus, fluorine, organic matter, and other impurities [1]. The particle morphology, particle size distribution, and crystal morphology of PBG are different from those of natural building gypsum [7, 8]. Chemical ball milling is a secondary method when chemical and water washing methods are used for phosphogypsum or building gypsum. Li [18] studied the impact of ball milling time on the specific area/particle size distribution/water consumption of normal consistency/ strength at 2h and strength at dry condition of building gypsum. E results showed that the best performance of building gypsum was obtained when the ball milling time was 3 min. If milling time continues to increase, the performance of the building gypsum cannot be improved. E experiment results showed that building gypsum had the best performance when ball milling time was 20 min and the particle size was Advances in Civil Engineering Xiong [19] obtained building gypsum by roasting and aging milled phosphogypsum. e experiment results showed that building gypsum had the best performance when ball milling time was 20 min and the particle size was Advances in Civil Engineering
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