Zimmer slipstream magnesium hydroxide recovery demonstration. Volume I of II. Final report, April 1, 1993--May 31, 1995 Page: 60 of 132
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1) Crystallizer Recycle
Crystallizer recycle was tested for its effect during the period covering 9/19/94 to
10/13/94. Crystallizer residence time of 2.6 hours resulted with HCOF#1 stream
having the lowest amount of gypsum carryover (2.7 wt %) and the highest amount
of magnesium hydroxide (74.9 wt %). (Table 8) A pH setpoint of 10.5 produced
the highest magnesium hydroxide purity (74.9 wt %) while a pH of 10.8 produced
the lowest gypsum impurity (2.7 wt %). In Table 8, there were no relevant trends
for particle size.
Crystallizer recycle was tested for its effect on the hydroclones during the period
covering 9/28/94 to 10/3/94. During crystallizer slurry recycle to the precipitation
tank, magnesium hydroxide particle size decreased (to as low as 3.7 microns) as
the number of hydroclones increased. (Table 9) The highest magnesium
hydroxide purity (75.4 wt %) in HCOF#1 occurred while operating 4 primary
hydroclones with 3/8 inch apexes and 5 secondary hydroclones with 1/4 inch
apexes. (Table 8)
2) Magnesium Hydroxide Recycle
Magnesium hydroxide recycle was tested for its effect on the crystallizer during
the period covering 10/4/94 to 10/7/94. Crystallizer residence time of 3.25 hours
produced the lowest amount of gypsum carryover (1.8 wt %) and the highest
amount of magnesium hydroxide (74.7 wt %) in the HCOF#1. (Table 8). The pH
setpoint that produced both the highest magnesium hydroxide purity and lowest
gypsum impurity was 10.8. Once again, no relevant trends appeared in the
particle size data from the testing period. (Table 9) Problems were encountered
controlling pH in the oxidizer when magnesium hydroxide was recycled to the
crystallizer. The source of magnesium hydroxide slurry for pH control of the52
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Zimmer slipstream magnesium hydroxide recovery demonstration. Volume I of II. Final report, April 1, 1993--May 31, 1995, report, March 1, 1998; Columbus, Ohio. (https://digital.library.unt.edu/ark:/67531/metadc693041/m1/60/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.