Physical Simulation of Bubble Behaviors and Optimization …
135
Table 1 Chemical components of phosphogypsum
Composition
CaO
SO 3
SiO 2
Al 2 O 3
Fe 2 O 3
Na 2 O
P 2 O 5
Others
Mass fraction/%
38.8
49.0
6.51
0.685
0.335
0.222
0.938
3.15
Fig. 1 XRD pattern of
phosphogypsum
the chemical reaction of phosphogypsum and CO 2 in ammonia solution, thereby
increasing the conversion rate of phosphogypsum [15].
Experimental Materials and Principles
Raw Materials
The raw material phosphogypsum sample was taken from Hubei Chuxing Chemical
Co., Ltd. The content of CaSO 4 ·2H 2 O (mass fraction) was 91.93%. Its chemical
composition is shown in Table 1. The X-ray diffractometer detects the phosphogypsum raw material sample (Fig. 1) and found that the main phases in the sample
are CaSO 4 ·2H 2 O and SiO 2 . The reagents used in the experiment are mainly CO 2 gas
(purity > 99.5%), NH 3 ·H2O (25–28% mass fractions), and air.
Experimental Principle and Process
The reaction of ammonium sulfate with phosphogypsum, ammonia water, and CO 2
is as follows:
135
Table 1 Chemical components of phosphogypsum
Composition
CaO
SO 3
SiO 2
Al 2 O 3
Fe 2 O 3
Na 2 O
P 2 O 5
Others
Mass fraction/%
38.8
49.0
6.51
0.685
0.335
0.222
0.938
3.15
Fig. 1 XRD pattern of
phosphogypsum
the chemical reaction of phosphogypsum and CO 2 in ammonia solution, thereby
increasing the conversion rate of phosphogypsum [15].
Experimental Materials and Principles
Raw Materials
The raw material phosphogypsum sample was taken from Hubei Chuxing Chemical
Co., Ltd. The content of CaSO 4 ·2H 2 O (mass fraction) was 91.93%. Its chemical
composition is shown in Table 1. The X-ray diffractometer detects the phosphogypsum raw material sample (Fig. 1) and found that the main phases in the sample
are CaSO 4 ·2H 2 O and SiO 2 . The reagents used in the experiment are mainly CO 2 gas
(purity > 99.5%), NH 3 ·H2O (25–28% mass fractions), and air.
Experimental Principle and Process
The reaction of ammonium sulfate with phosphogypsum, ammonia water, and CO 2
is as follows: