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US 10,384,953 B2Granted
System and methods for removing impurities from phosphogypsum and manufacturing gypsum binders and products
AssigneesTechnion Research & Development Foundation Limited, Vanderbilt University
InventorsKonstantin Kovler, Boris Dashevsky, David Samuel Kosson, Yonathan Reches
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Abstract
Methods and systems that remove impurities from phosphogypsum (PG), including from radium and heavy metal salts, and produce gypsum binders and products. In one embodiment, PG is reacted with a chloride solution in an acidic environment under mechanical manipulation and/or heat followed by galvanic and/or zeolite absorption removal of impurities.
Claims10
A system for removing impurities from phosphogypsum (PG), the system comprising:
- a ball drum mill configured for reacting a chloride solution and PG at a temperature between about 85° C. to about 150° C. to produce a PG reaction slurry;
- a reaction pool configured for dehydrating said PG reaction slurry at a temperature between about 85° C. to about 150° C., wherein the reaction pool is in fluid connection with the ball drum mill;
- a filter configured to separate a solid fraction containing an alpha-hemihydrate gypsum crystal from a liquid waste fraction of said PG reaction slurry, wherein the filter is in fluid connection with the reaction pool, wherein the filter is configured to maintain temperature of the solid and liquid fractions;
- and
- a neutralization mixer configured for mixing the solid fraction with calcium oxide to neutralize the solid fraction, wherein the neutralization mixer is in fluid connection with the filter and wherein the neutralization mixer is configured to maintain temperature of the solid fraction.
2 more elements
Dependencies are inferred from the claim text.