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(11)    Patent No :    AP 2572   
(21)    Application No :    AP/P/2009/004924   
(22)    Filing Date :    18.12.2007   
(24)    Date of Grant &    23.01.2013   
(45)    Publication :

(30)  Priority Data       
(33) Country    (31) Number    (32) Date
US    60/882,401    28.12.2006
(84)    Designated State

BW    GM    GH    KE    LS    MW  MZ   NA   SL
SD    SZ    T Z    UG    ZM    ZW

(73) Applicant(s)

MOLYCORP MINERALS, LLC, HC1 Box 224, Mountain Pass,

CA 92366,
United States of America

(72) Inventors

BURBA John L III, United States of America

HASSLER Carl R, United States of America

O'KELLEY C Broock, United States of America

et al

(74) Representative


(51)    International  Classification   C02F 1/56 (2006.01)

(54)    Title

Method and apparatus for removing arsenic from a solution

(57)    Abstract
A method and apparatus for separating arsenic from an aqueous solution containing arsenic. The method includes the steps of contacting an
arsenic-containing solution with a first portion of fixing agent to remove at least a portion of the arsenic. An arsenic -laden fixing agent is separated from the solution and the partially depleted solution is contacted with a second portion of fixing agent. The fixing agent can include a high surface area insoluble compound containing one or more of cerium, lanthanum, or praseodymium. Following removal of the arsenic, the arsenic -depleted solution can be further processed to separate a recoverable metal through metal refining. The arsenic-laden fixing agent can be filtered to recover and recycle a filtrate to the solution for additional treatment, as well as using a partially saturated fixing agent to remove arsenic from fresh solution. An arsenic-containing solution can be formed from arsenic -containing solids such as contaminated soils, industrial byproducts and waste materials
(56)    Documents Cited :    DAUBER S.    US 2003/155303 A1


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