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400
450
500
550
600
650
700
70
72
74
76
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Conversion rate/%
Stirring speed/(r/min)
CBY
SSB
SSB-D
Fig. 15 Effect of agitators on conversion rate. (Color figure online)
(2) The optimal experimental conditions in the reactor are: the shape of agitator is
SSB-D agitator, the stirring speed is 600 r/min, eccentric stirring is 0.4, the inlet
gas flow is 0.12 m
3 /h, and the height of agitator is 3 cm. Under this condition,
the average bubble size is distributed between 0.5 and 3 mm, and the effect of
micro-bubble is the best. This optimal condition can be used in the experiment
of phosphogypsum conversion to ammonium sulfate.
(3) Under the optimal conditions explored by the water simulation, the conversion
rate of phosphogypsum can reach up to 91.95%.
Variables
(1) Eccentric stirring is the ratio of the distance from the center of the agitator to
the radius of the cylinder.
(2) Height of agitator is the distance between the agitator and the bottom of the
reactor.
(3) M1 and M represent the mass of CaCO 3 in the actual and the theoretical output,
respectively.
References
1. Pan W, Wu S, Zeng QY (2019) Progress in resource utilization of phosphogypsum. Yunnan
Chem Ind 46(04):16–19+22