US 11,912,582 B2
Systems and methods to recover value-added materials from gypsum
Lucien M. Papouchado, Aiken, SC (US); Barry E. Sheetz, Lemont, PA (US); Leonard Passmore, Clarksville, VA (US); and Joseph D. Preston, Bainbridge Island, WA (US)
Assigned to Davy Powersports Inc., Bainbridge Island, WA (US)
Filed by Davy Powersports Inc., Bainbridge Island, WA (US)
Filed on Oct. 12, 2022, as Appl. No. 17/964,292.
Application 17/964,292 is a continuation of application No. 17/321,437, filed on May 15, 2021, granted, now 11,479,472.
Application 17/321,437 is a continuation in part of application No. 16/749,860, filed on Jan. 22, 2020, granted, now 11,148,956, issued on Oct. 19, 2021.
Claims priority of provisional application 63/149,045, filed on Feb. 12, 2021.
Claims priority of provisional application 63/025,548, filed on May 15, 2020.
Claims priority of provisional application 62/878,542, filed on Jul. 25, 2019.
Claims priority of provisional application 62/824,523, filed on Mar. 27, 2019.
Claims priority of provisional application 62/810,066, filed on Feb. 25, 2019.
Claims priority of provisional application 62/796,541, filed on Jan. 24, 2019.
Prior Publication US 2023/0045286 A1, Feb. 9, 2023
Int. Cl. C01F 11/18 (2006.01); C01C 1/244 (2006.01); B01D 9/00 (2006.01); B01D 36/02 (2006.01); B01D 36/04 (2006.01); B01D 21/26 (2006.01)
CPC C01F 11/18 (2013.01) [B01D 9/0022 (2013.01); B01D 9/0059 (2013.01); B01D 21/262 (2013.01); B01D 36/02 (2013.01); B01D 36/045 (2013.01); C01C 1/244 (2013.01); B01D 2009/0086 (2013.01); C01P 2006/80 (2013.01)] 19 Claims
 
1. A method for isolating metals from chemical processing comprising:
forming a mixture comprising chemical intermediates, wherein the
chemical intermediates comprise at least one of calcium, nitrates, carbonates, sulfates and metal impurities wherein the mixture results from chemical processing, and wherein the mixture has a pH value;
responsive to forming the mixture, combining the mixture and a first reagent to change the pH of the mixture, wherein the first reagent is added until the pH of the mixture reaches a first predetermined pH value to form a first precipitate, wherein the first precipitate comprises at least one of a metal and a rare earth element; and
responsive to forming a precipitate, removing the precipitate from the mixture via a filter to form a first filtrate,
wherein the process to form the first precipitate is performed at a pH of 4, and wherein the first precipitate comprises at least one of iron, aluminum, uranium, scandium, or thorium.