Patent ID: 11905189
Assignee: nan
Field: Environmental technology (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A method of recovering barium sulfate from a contaminated water source, wherein at least a portion of said contaminated water source comprises barium cation, said method comprising:
(a) providing a source of sulfate ion;
(b) combining together said contaminated water source and said source of sulfate ion, thereby forming a modified contaminated water source;
(c) forming precipitated barium sulfate within said modified contaminated water source, thereby forming a further modified contaminated water source, wherein forming precipitated barium sulfate within said modified contaminated water source further comprises:
adjusting the pH of said modified contaminated water source to an adjusted pH value of greater than 7.0, and
adding a flocculation aid to said modified contaminated water source;

(d) isolating precipitated barium sulfate from said further modified contaminated water source, thereby forming isolated precipitated barium sulfate;
(e) dewatering the isolated precipitated barium sulfate, thereby forming a low-moisture precipitated barium sulfate having a water content of less than or equal to 50 percent by weight, based on total weight of the low-moisture precipitated barium sulfate;
(f) exposing the low-moisture precipitated barium sulfate to an elevated temperature of at least 105° C., thereby forming a refined barium sulfate having a density of at least 4.10 g/ml, and a content of calcium ion of less than or equal to 250 mg/Kg; and
(g) subjecting the refined barium sulfate to particle size reduction and/or particle size classification, thereby forming a recovered barium sulfate.