EP2697174A1 - Elimination par terres rares d'espèces hydratées et hydroxylées - Google Patents

Elimination par terres rares d'espèces hydratées et hydroxylées

Info

Publication number
EP2697174A1
EP2697174A1 EP20120771706 EP12771706A EP2697174A1 EP 2697174 A1 EP2697174 A1 EP 2697174A1 EP 20120771706 EP20120771706 EP 20120771706 EP 12771706 A EP12771706 A EP 12771706A EP 2697174 A1 EP2697174 A1 EP 2697174A1
Authority
EP
European Patent Office
Prior art keywords
metal
rare earth
metalloid
target material
carbonate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP20120771706
Other languages
German (de)
English (en)
Other versions
EP2697174A4 (fr
Inventor
Robert Cable
Carl Hassler
John Burba
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Molycorp Minerals LLC
Original Assignee
Molycorp Minerals LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US13/244,092 external-priority patent/US20120074071A1/en
Priority claimed from US13/244,117 external-priority patent/US20120103909A1/en
Priority claimed from US13/356,581 external-priority patent/US20120187047A1/en
Priority claimed from US13/356,574 external-priority patent/US20120187337A1/en
Priority claimed from US13/410,081 external-priority patent/US20120223022A1/en
Application filed by Molycorp Minerals LLC filed Critical Molycorp Minerals LLC
Priority claimed from US13/432,895 external-priority patent/US20120261611A1/en
Priority claimed from US13/433,097 external-priority patent/US20180251383A9/en
Publication of EP2697174A1 publication Critical patent/EP2697174A1/fr
Publication of EP2697174A4 publication Critical patent/EP2697174A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/20—Nature of the water, waste water, sewage or sludge to be treated from animal husbandry
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/30—Wastewater or sewage treatment systems using renewable energies
    • Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy

Definitions

  • the present disclosure is related generally to rare earth removal of hydrated and hydroxyl species, more particularly to rare earth removal of metal and metalloid- containing hydrated and/or hydroxyl species.
  • the present disclosure is directed to the use of rare earth-containing compositions to remove various contaminants, including metal and metalloid target materials.
  • a composition has the formula:
  • M is a metal or metalloid having an atomic number selected from the group consisting of 5, 13, 22-33, 40-52, 56, 72-84, and 88-94.
  • the symbol "n” is a real number ⁇ 8 and represents a charge or oxidation state of "M”.
  • the composition is in a liquid media or medium, and the media or medium comprises a pH and Eh sufficient to favor MS as the primary species of M.
  • M is one or more of boron, vanadium, chromium, cadmium, antimony, lead, and bismuth.
  • a method contacts, in a medium, a rare earth-containing additive with a metal or metalloid target material to remove the target material.
  • the target material is in the form of a hydroxide, carbonate, hydrate, or oxyhydroxyl as a primary species.
  • a method that contacts, in a medium, a rare earth- containing additive with one or more of a metal or metalloid hydroxide, carbonate, and hydrate to remove the metal or metalloid hydroxide, carbonate, and/or hydrate.
  • the rare earth-containing additive can be water soluble or water insoluble.
  • the target material has an atomic number selected from the group consisting of 5, 13, 22-33, 40-52, 56, 72-84, and 88-94.
  • the contacting step comprises the sub-steps:
  • the contacting step comprises the sub-steps:
  • the contacting step comprises the sub-steps: (a) introducing, to the medium, a base and/or base equivalent to convert a target material-containing species comprising the metal or metalloid to a primary species in the form of the metal or metalloid hydroxide, carbonate, oxyhydroxl, and/or hydrate, the target material-containing species being different from the metal or metalloid hydroxide, carbonate, oxyhydroxyl, and/or hydrate; and
  • the contacting step comprises the sub-steps:
  • the rare earth- containing composition can remove effectively a large number of target materials, whether in the form of dissolved or undissolved species.
  • the composition can remove lead and lead species in various forms, including as a colloid, hydrate, carbonate, hydroxide, and oxyhydroxyl.
  • the pH and/or Eh can be adjusted to produce a selected primary target material species, which is removed more effectively by the rare earth composition compared to rare earth removal of other target material species. High levels of removal of selected target materials can therefore be realized.
  • the term “a” or “an” entity refers to one or more of that entity.
  • the terms “a” (or “an”), “one or more” and “at least one” can be used interchangeably herein. It is also to be noted that the terms “comprising”, “including”, and “having” can be used interchangeably.
  • ABS refers to the penetration of one substance into the inner structure of another substance, as distinguished from adsorption.
  • Adsorption refers to the adherence of atoms, ions, molecules, polyatomic ions, or other substances to the surface of another substance, called the adsorbent.
  • the attractive force for adsorption can be in the form of a bond and/or force, such ascovalent bonds, metallic bonds, coordination bonds, ionic bonds, hydrogen bonds, electrostatic forces (e.g., van der Waals and/or London's forces), and the like.
  • each of the expressions “at least one of A, B and C”, “at least one of A, B, or C”, “one or more of A, B, and C", “one or more of A, B, or C” and “A, B, and/or C” means A alone, B alone, C alone, A and B together, A and C together, B and C together, or A, B and C together.
  • water refers to any aqueous stream. The water may originate from any aqueous stream may be derived from any natural and/or industrial source.
  • Non- limiting examples of such aqueous streams and/or waters are drinking waters, potable waters, recreational waters, waters derived from manufacturing processes, wastewaters, pool waters, spa waters, cooling waters, boiler waters, process waters, municipal waters, sewage waters, agricultural waters, ground waters, power plant waters, remediation waters, co-mingled water and combinations thereof.
  • amalgamate and “aggregate” refer to a composition formed by gathering one or more materials into a mass.
  • a "binder” generally refers to one or more substances that bind together a material being agglomerated. Binders are typically solids, semi-solids, or liquids. Non-limiting examples of binders are polymeric materials, tar, pitch, asphalt, wax, cement water, solutions, dispersions, powders, silicates, gels, oils, alcohols, clays, starch, silicates, acids, molasses, lime, lignosulphonate oils, hydrocarbons, glycerin, stearate, or combinations thereof. The binder may or may not chemically react with the material being
  • Non-liming examples of chemical reactions include hydration/dehydration, metal ion reactions, precipitation/gelation reactions, and surface charge modification.
  • a “carbonate” generally refers to a chemical compound containing the carbonate radical or ion (C0 3 2 ). Most familiar carbonates are salts that are formed by reacting an inorganic base (e.g., a metal hydroxide with carbonic acid (H 2 CO 3 ). Normal carbonates are formed when equivalent amounts of acid and base react; bicarbonates, also called acid carbonates or hydrogen carbonates, are formed when the acid is present in excess.
  • an inorganic base e.g., a metal hydroxide with carbonic acid (H 2 CO 3 ).
  • bicarbonates also called acid carbonates or hydrogen carbonates
  • carbonates examples include sodium carbonate, (Na 2 C0 3 ), sodium bicarbonate
  • the term "clarification” or “clarify” refers to the removal of suspended and, possibly, colloidal solids by gravitational settling techniques.
  • the term “coagulation” refers to the destabilization of colloids by neutralizing the forces that keep colloidal materials suspended. Cationic coagulants provide positive electrical charge to reduce the negative charge (zeta potential) of the colloids. The colloids thereby form larger particles (known as floes).
  • composition generally refers to one or more chemical units composed of one or more atoms, such as a molecule, polyatomic ion, chemical compound, coordination complex, coordination compound, and the like.
  • bonds and/or forces such as covalent bonds, metallic bonds, coordination bonds, ionic bonds, hydrogen bonds, electrostatic forces (e.g., van der Waal's forces and London's forces), and the like.
  • “Chemical species” or “species” are atoms, elements, molecules, molecular fragments, ions, compounds, and other chemical structures.
  • Chemical transformation refers to process where at least some of a material has had its chemical composition transformed by a chemical reaction.
  • a “chemical transformation” differs from “a physical transformation”.
  • a physical transformation refers to a process where the chemical composition has not been chemically transformed but a physical property, such as size or shape, has been transformed.
  • the term "contained within the water” generally refers to materials suspended and/or dissolved within the water.
  • Water is typically a solvent for dissolved materials and water-soluble material.
  • water is typically not a solvent for insoluble materials and water-insoluble materials.
  • Suspended materials are substantially insoluble in water and dissolved materials are substantially soluble in water.
  • the suspended materials have a particle size.
  • De-toxify or “de-toxification” includes rendering a target material, such as chemical and/or biological target material non-toxic or non-harmful to a living organism, such as, for example, human or other animal.
  • the target material may be rendered nontoxic by converting the target material into a non-toxic or non-harmful form or species.
  • digest or “digestion” refers to the use of microorganisms, particularly bacteria, to digest target materials. This is commonly established by mixing forcefully contaminated water with bacteria and molecularly oxygen.
  • infectious refers to the use of an antimicrobial agent to kill or inhibit the growth of microorganisms, such as bacteria, fungi, protozoans, and viruses.
  • antimicrobial agents include, oxidants, reductants, alchohols, aldehydes, halogens, phenolics, quaternary ammonium compounds, silver, copper, ultraviolet light, and other materials.
  • flocculation refers to a process using a flocculant, which is typically a polymer, to form a bridge between floes and bind the particles into large agglomerates or clumps. Bridging occurs when segments of the polymer chain adsorb on different particles and help particles aggregate.
  • fluid refers to a liquid, gas or both.
  • halogen is a nonmetal element from Group 17 IUPAC Style (formerly: VII,
  • the artificially created element 117 provisionally referred to by the systematic name ununseptium, may also be a halogen.
  • a "halide compound” is a compound having as one part of the compound at least one halogen atom and the other part the compound is an element or radical that is less electronegative (or more electropositive) than the halogen.
  • the halide compound is typically a fluoride, chloride, bromide, iodide, or astatide compound.
  • Many salts are halides having a halide anion.
  • a halide anion is a halogen atom bearing a negative charge.
  • halide anions are fluoride (F ), chloride (CI ), bromide (Br ), iodide (T) and astatide
  • a “hydroxy 1” generally refers to a chemical functional group containing an oxygen atom connected by a covalent bond to a hydrogen atom. When it appears in a chemical speices, the hydroxyl group imparts some of the reactive and interactive properties of of water (ionizability, hydrogen bonding, etc.). Chemical species containing one or more hydroxyl groups are typically referred to as “hydroxyl species”.
  • the neutral form of the hydroxyl group is a hydroxyl radical.
  • the anion form of the hydroxyl group (OFT) is called “an hydroxide” or "hydroxide anion”.
  • hydrated species generally refers to any of a class of compounds or other species containing chemically combined with water, whether occurring as a solid or a fluid component and whether occurring as a compound or charged species.
  • washing soda Na 2 C03 - 10H 2 O
  • the water is loosely held and is easily lost on heating; in others, as sulfuric acid, S03-H 2 0, or H 2 SO 4 , it is strongly held as water of constitution.
  • inorganic material generally refers to a chemical compound or other species that is not an organic material.
  • insoluble refers to materials that are intended to be and/or remain as solids in water. Insoluble materials are able to be retained in a device, such as a column, or be readily recovered from a batch reaction using physical means, such as filtration. Insoluble materials should be capable of prolonged exposure to water, over weeks or months, with little loss of mass. Typically, a little loss of mass refers to less than about 5% mass loss of the insoluble material after a prolonged exposure to water.
  • An “ion” generally refers to an atom or group of atoms having a charge.
  • the charge on the ion may be negative or positive.
  • Organic carbons or “organic material” generally refer to any compound of carbon except such binary compounds as carbon oxides, the carbides, carbon disulfide, etc.; such ternary compounds as the metallic cyanides, metallic carbonyls, phosgene, carbonyl sulfide, etc.; and the metallic carbonates, such as alkali and alkaline earth metal carbonates.
  • oxidizing agent generally refers to one or both of a chemical substance and physical process that transfers and/or assists in removal of one or more electrons from a substance.
  • the substance having the one or more electrons being removed is oxidized.
  • the physical process may removal and/or may assist in the removal of one or more electrons from the substance being oxidized.
  • the substance to be oxidized can be oxidized by electromagnetic energy when the interaction of the electromagnetic energy with the substance be oxidized is sufficient to substantially remove one or more electrons from the substance.
  • the interaction of the electromagnetic energy with the substance being oxidized may not be sufficient to remove one or more electrons, but may be enough to excite electrons to higher energy state, were the electron in the excited state can be more easily removed by one or more of a chemical substance, thermal energy, or such.
  • oxyanion and/or “oxoanion” generally refers to anionic chemical compounds having a negative charge with a generic formula of A x O (where A represents a chemical element other than oxygen," O" represents the element oxygen and x, y and z represent real numbers).
  • A represents metal, metalloid, and/or non-metal elements.
  • metal-based oxyanions include chromate, tungstate, molybdate, aluminates, zirconate, etc.
  • metalloid-based oxyanions include arsenate, arsenite, antimonate, germanate, silicate, etc.
  • non-metal-based oxyanions examples include phosphate, selemate, sulfate, etc.
  • the oxyanion includes oxyanions of elements having an atomic number of 7, 13 tol7, 22 to 26, 31 to 35, 40 to 42, 44, 45, 49 to 53, 72 to 75, 77, 78, 82, 83 85, 88, and 92.
  • These elements include these elements include nitrogen, aluminum, silicon, phosphorous, sulfur, chlorine, titanium, vanadium, chromium, manganese, barium, arsenic, selenium, bromine, gallium, germanium, zirconium, niobium, molybdenum, ruthenium, rhodium, indium, tin, iodine, antimony, tellurium, hafnium, tantalum, tungsten, rhenium, iridium, platinum, lead, bismuth astatine, radium, and uranium.
  • oxyspecies and/or “oxospecies” generally refer to cationic, anionic, or neutral chemical compounds with a generic formula of A x O y (where A represents a chemical element other than oxygen, O represents the element oxygen and x and y represent real numbers).
  • A represents a chemical element other than oxygen
  • O represents the element oxygen
  • x and y represent real numbers
  • A represents metal, metalloid, and/or non-metal elements.
  • An oxyanion or oxoanion are a type of oxyspecies or oxospecies.
  • polish refers to any process, such as filtration, to remove small (usually microscopic) particulate material or very small low concentrations of dissolved target material from water.
  • pore volume and "pore size”, respectively, refer to pore volume and pore size determinations made by any suite measure method.
  • the pore size and pore volume are determined by any suitable Barret- Joyner-Halenda method for
  • pore size and volume can be used interchangeably.
  • Precipitation generally refers to the removal of a dissolved target material in the form of an insoluble target material-laden rare earth composition.
  • the target material- laden rare earth composition can comprise a target-laden cerium (IV) composition, a target-laden rare earth-containing additive composition, a target-laden rare composition comprising a rare earth other than cerium (IV), or a combination thereof.
  • the target material-laden rare earth composition comprises an insoluble target material-laden rare earth composition.
  • “precipitation” includes processes, such as adsorption and absorption of the target material by one or more of the cerium (IV) composition, the rare earth-containing additive, or a rare earth other than cerium (IV).
  • the target-material laden composition can comprise a +3 rare earth, such as cerium (III), lanthanum (III) or other lanthanoid having a +3 oxidation state.
  • a "principal species” generally refers to the major species in which a cation is present, under a specified set of conditions. Although usually applied to cations, the term
  • radicals may be negatively charged or uncharged.
  • a “radical” generally refers to an atom or group of atoms that are joined together in some particular spatial structure and commonly take part in chemical reactions as a single unit.
  • a radical is more generally an atom, molecule, or ion (group of atoms is probably ok) with one or more unpaired electrons.
  • a radical may have a net positive or negative charge or be neutral.
  • Rare earth refers to one or more of yttrium, scandium, lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium erbium, thulium, ytterbium, and lutetium.
  • lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium erbium, thulium, ytterbium, and lutetium are known as lanthanoids.
  • rare earth refers to singular and plural forms of the terms.
  • IR refers to a single rare earth and/or combination and/or mixture of rare earths and the term "rare earth-containing
  • composition refers to a single composition comprising a single rare earth and/or a mixture of differing rare earth-containing compositions containing one or more rare earths and/or a single composition containing one or more rare earths.
  • the terms "rare earth- containing additive” and “rare earth-containing particle” are additives or particles including a single composition comprising a single rare earth and/or a mixture of differing rare earth-containing compositions containing one or more rare earths and/or a single composition containing one or more rare earths.
  • processed rare earth composition refers not only to any composition containing a rare earth other than non- compositionally altered rare earth-containing minerals.
  • processed rare earth-containing composition excludes comminuted naturally occurring rare earth-containing minerals.
  • processed rare earth-containing composition includes a rare earth-containing mineral where one or both of the chemical composition and chemical structure of the rare earth-containing portion of the mineral has been compositionally altered. More specifically, a comminuted naturally occurring bastnasite would not be considered a processed rare earth-containing composition and/or processed rare earth-containing additive. However, a synthetically prepared bastnasite or a rare earth-containing composition prepared by a chemical transformation of naturally occurring bastnasite would be considered a processed rare earth-containing composition and/or processed rare earth-containing additive.
  • the processed rare earth and/or rare- containing composition and/or additive are, in one application, not a naturally occurring mineral but synthetically manufactured.
  • Exemplary naturally occurring rare earth- containing minerals include bastnasite (a carbonate-fluoride mineral) and monazite.
  • rare earth-containing minerals include aeschynite, allanite, apatite, britholite, brockite, cerite, fluorcerite, fluorite, gadolinite, parisite, stillwellite, synchisite, titanite, xenotime, zircon, and zirconolite.
  • exemplary uranium minerals include uraninite (U0 2 ), pitchblende (a mixed oxide, usually UsOg), brannerite (a complex oxide of uranium, rare-earths, iron and titanium), coffinite (uranium silicate), carnotite, autunite, davidite, gummite, torbernite and uranophane.
  • the rare earth- containing composition is substantially free of one or more elements in Group 1 , 2, 4-15, or 17 of the Periodic Table, a radioactive species, such as uranium, sulfur, selenium, tellurium, and polonium.
  • reducing agent generally refers to an element or compound that donates one or more electrons to another species or agent this is reduced.
  • the reducing agent is oxidized and the other species, which accepts the one or more electrons, is reduced.
  • removing includes the sorbtion, precipitation, conversion, detoxification, deactivation, and/or combination thereof of a target material contained in a water and/or water handling system.
  • soluble refers to a material that readily dissolves in a fluid, such as water or other solvent.
  • a fluid such as water or other solvent.
  • dissolution of a soluble material would necessarily occur on a time scale of minutes rather than days.
  • the material to be considered to be soluble it is necessary that the
  • material/composition has a significant solubility in the fluid such that upwards of about 5 g of the material will dissolve in about one liter of the fluid and be stable in the fluid.
  • sorb refers to adsorption, absorption or both adsorption and absorption.
  • suspension refers to a heterogeneous mixture of a solid, typically in the form of particulates dispersed in a liquid. In a suspension, the solid particulates are in the form of a discontinuous phase dispersed in a continuous liquid phase.
  • colloid refers to a suspension comprising solid particulates that typically do not settle-out from the continuous liquid phase due to gravitational forces.
  • a "colloid” typically refers to a system having finely divided particles ranging from about 10 to 10,000 angstroms in size, dispersed within a continuous medium. As used hereinafter, the terms "suspension",
  • “colloid” or “slurry” will be used interchangeably to refer to one or more materials dispersed and/or suspended in a continuous liquid phase.
  • the term “surface area” refers to surface area of a material and/or substance determined by any suitable surface area measurement method. Preferably, the surface area is determined by any suitable Brunauer-Emmett-Teller (BET) analysis technique for determining the specific area of a material and/or substance.
  • BET Brunauer-Emmett-Teller
  • water handling system refers to any system containing, conveying, manipulating, physically transforming, chemically processing, mechanically processing, purifying, generating and/or forming the aqueous composition, treating, mixing and/or co- mingling the aqueous composition with one or more other waters and any combination thereof.
  • a “water handling system component” refers to one or more unit operations and/or pieces of equipment that process and/or treat water (such as a holding tank, reactor, purifier, treatment vessel or unit, mixing vessel or element, wash circuit, precipitation vessel, separation vessel or unit, settling tank or vessel, reservoir, pump, aerator, cooling tower, heat exchanger, valve, boiler, filtration device, solid liquid and/or gas liquid separator, nozzle, tender, and such), conduits interconnecting the unit operations and/or equipment (such as piping, hoses, channels, aqua-ducts, ditches, and such) and the water conveyed by the conduits.
  • the water handling system components and conduits are in fluid communication.
  • water and "water handling system” will be used interchangeably. That is, the term “water” may used to refer to “a water handling system” and the term “water handling system” may be used to refer to the term “water”.
  • Fig. 1 depicts a water handling system and method according to an embodiment
  • Figs. 2A-E depict prior art Pourbaix diagrams under specified conditions for primary species of boron
  • Figs. 3A-E depict prior art Pourbaix diagrams under specified conditions for primary species of aluminum
  • Figs. 4A-D depict prior art Pourbaix diagrams under specified conditions for primary species of thallium
  • Figs. 5A-E depict prior art Pourbaix diagrams under specified conditions for primary species of vanadium
  • Figs. 6A-E depict prior art Pourbaix diagrams under specified conditions for primary species of chromium
  • Figs. 7A-F depict prior art Pourbaix diagrams under specified conditions for primary species of manganese
  • Figs. 8A-F depict prior art Pourbaix diagrams under specified conditions for primary species of iron
  • Figs. 9A-E depict prior art Pourbaix diagrams under specified conditions for primary species of cobalt
  • Figs. 10A-E depict prior art Pourbaix diagrams under specified conditions for primary species of nickel
  • Figs. 11 A-E depict prior art Pourbaix diagrams under specified conditions for primary species of copper
  • Figs. 12A-D depict prior art Pourbaix diagrams under specified conditions for primary species of zinc
  • Figs. 13A-B depict prior art Pourbaix diagrams under specified conditions for primary species of gallium
  • Fig. 14 depicts a prior art Pourbaix diagram under specified conditions for primary species of germanium
  • Figs. 15A-D depict prior art Pourbaix diagrams under specified conditions for primary species of arsenic
  • Figs. 16A-D depict prior art Pourbaix diagrams under specified conditions for primary species of zirconium
  • Figs. 17A-D depict prior art Pourbaix diagrams under specified conditions for primary species of niobium
  • Figs. 18A-C depict prior art Pourbaix diagrams under specified conditions for primary species of molybdenum
  • Figs. 19A-F depict prior art Pourbaix diagrams under specified conditions for primary species of technetium
  • Figs. 20A-D depict prior art Pourbaix diagrams under specified conditions for primary species of ruthenium
  • Figs. 21A-B depicts a prior art Pourbaix diagram under specified conditions for primary species of rhodium
  • Figs. 22A-C depict prior art Pourbaix diagrams under specified conditions for primary species of palladium
  • Figs. 23A-E depict prior art Pourbaix diagrams under specified conditions for primary species of silver
  • Figs. 24A-C depict prior art Pourbaix diagrams under specified conditions for primary species of cadmium
  • Figs. 25A-B depict prior art Pourbaix diagrams under specified conditions for primary species of indium
  • Figs. 26A-E depict prior art Pourbaix diagrams under specified conditions for primary species of tin
  • Figs. 27A-D depict prior art Pourbaix diagrams under specified conditions for primary species of antimony
  • Fig. 28 depicts a prior art Pourbaix diagram under specified conditions for primary species of tellurium
  • Fig. 29 depicts a prior art Pourbaix diagram under specified conditions for primary species of hafnium
  • Fig. 30 depicts a prior art Pourbaix diagram under specified conditions for primary species of lead
  • Figs. 31A-B depict prior art Pourbaix diagrams under specified conditions for primary species of tungsten
  • Figs. 32A-B depict prior art Pourbaix diagrams under specified conditions for primary species of rhenium
  • Fig. 33 depicts a prior art Pourbaix diagram under specified conditions for primary species of osmium
  • Fig. 34 depicts a prior art Pourbaix diagram under specified conditions for primary species of uranium
  • Figs. 35A-B depict prior art Pourbaix diagrams under specified conditions for primary species of platinum
  • Figs. 36A-C depict prior art Pourbaix diagrams under specified conditions for primary species of gold
  • Figs. 37A-D depict prior art Pourbaix diagrams under specified conditions for primary species of mercury
  • Figs. 38A-E depict prior art Pourbaix diagrams under specified conditions for primary species of lead
  • Fig. 39 depicts a prior art Pourbaix diagram under specified conditions for primary species of lead
  • Figs. 40A-C depict prior art Pourbaix diagrams under specified conditions for primary species of bismuth
  • Figs. 41A-B depict prior art Pourbaix diagrams under specified conditions for primary species of polonium
  • Figs. 42A-B depict prior art Pourbaix diagrams under specified conditions for primary species of actinium
  • Figs. 43A-E depict prior art Pourbaix diagrams under specified conditions for primary species of thorium
  • Figs. 44A-B depict prior art Pourbaix diagrams under specified conditions for primary species of protactinium
  • Figs. 45A-G depict prior art Pourbaix diagrams under specified conditions for primary species of uranium
  • Figs. 46A-E depict prior art Pourbaix diagrams under specified conditions for primary species of neptunium
  • Figs. 47A-F depict prior art Pourbaix diagrams under specified conditions for primary species of plutonium
  • Fig. 48 is a plot of loading capacity (mg/g) (vertical axis) versus arsenic concentration (g/L) (horizontal axis);
  • Fig. 49 is a plot of final arsenic concentration (mg/L) (vertical axis) versus molar ratio of cerium:arsenic (horizontal axis);
  • Fig. 50 is a plot of final arsenic concentration (mg/L) (vertical axis) versus molar ratio of cerium to arsenic (horizontal axis);
  • Fig. 51 is a series of XRD patterns for precipitates formed upon addition of Ce (III) or Ce (IV) solutions to sulfide-arsenite solutions and sulfate-arsenate solutions;
  • Fig. 52 is a plot of arsenic sequestered (micromoles) (vertical axis) and cerium added (micromoles) (horizontal axis);
  • Fig. 53 is a series of XRD patterns exhibiting the structural differences between gasparite (CeAsOzi) and the novel trigonal phase CeAs04 ⁇ ( ⁇ 2 ⁇ ) ⁇ ;
  • Fig. 54 is a series of XRD patterns exhibiting the structural differences among trigonal CeAs04 ⁇ ( ⁇ 2 ⁇ ) ⁇ (experimental), trigonal CeAs04 ⁇ ( ⁇ 2 ⁇ ) ⁇ (simulated), and trigonal B1PO4 ⁇ (H20)Q.67 (simulated);
  • Fig. 55 is a plot of arsenic capacity (mg As/g Ce0 2 ) against various solution compositions;
  • Fig. 56 is a plot of arsenic (V) concentration (ppb) against bed volumes treated;
  • Fig. 57 is a plot of mg As/g Ce0 2 (vertical axis) against test solution conditions (horizontal axis);
  • Fig. 58 depicts a prior art Pourbaix diagram under specified conditions for primary species of bismuth
  • Fig. 59 depicts a prior art Pourbaix diagram under specified conditions for primary species of aluminum
  • Fig. 60 depicts a prior art Pourbaix diagram under specified conditions for primary species of cobalt
  • Fig. 61 depicts a prior art Pourbaix diagram under specified conditions for primary species of chromium
  • Fig. 62 depicts a prior art Pourbaix diagram under specified conditions for primary species of manganese
  • Fig. 63 depicts a prior art Pourbaix diagram under specified conditions for primary species of copper
  • Fig. 64 depicts a prior art Pourbaix diagram under specified conditions for primary species of zirconium
  • Fig. 65 depicts a prior art Pourbaix diagram under specified conditions for primary species of zinc
  • Figs. 66 A-E depict prior art Pourbaix diagrams under specified conditions for primary species of barium; and Figs. 67 A-E depict prior art Pourbaix diagrams under specified conditions for primary species of radium.
  • the present disclosure is directed to removal from and/or detoxification of water, a water-handling system, or an aqueous medium or other aqueous media, of a target material or target material-containing species, such as a pollutant or contaminant, by a rare earth-containing composition, additive, or particle.
  • a target material or target material-containing species such as a pollutant or contaminant
  • the rare earth-containing composition, additive, or particle is a processed rare earth-containing composition, additive or particle.
  • the target material or target material-containing species is removed and/or detoxified by forming a target material- laden rare earth-containing composition comprising the target material, target material- containing species, or a derivative thereof.
  • the target material is one or more of an inorganic oxyspecies (other than an oxyanion), a hydroxyl species, which may comprise a hydroxide ion or hydroxyl radical, a hydrated species, or a combination thereof.
  • the rare earth-containing composition may be soluble or insoluble and commonly is cerium, a cerium-containing compound, lanthanum, a lanthanum-containing compound, or a mixture thereof.
  • a more common rare earth-containing composition is cerium (IV) oxide, cerium (III) oxide, a cerium (IV) salt, a cerium (III) salt, lanthanum (III) oxide, a lanthanum (III) salt, or a mixture thereof.
  • the target material-laden rare earth composition comprises one or more of the target material and/or species thereof or a portion of the target material and/or species thereof.
  • the rare earth-containing composition, additive, and/or particles may be water- soluble, water-insoluble, a combination of water-soluble and/or water-insoluble rare earth- containing compositions, additives, and/or particles, a partially water-soluble rare earth- containing composition, additive, and/or particles, and/or a partially water-insoluble rare earth-containing composition, additive and/or particles.
  • the rare earth-containing composition, additive, and/or particles comprise cerium, in the form of a cerium-containng compound and/or dissociated ionic form of cerium, lanthanum, in the form of a lanthanum-containing compound and/or dissociated ionic form of lanthanum, or a mixture thereof. More common rare earth- containing composition, additives, and particles are cerium (IV) oxides, cerium (III) oxides, cerium (IV) salts, cerium (III) salts, lanthanum (III) oxides, lanthanum (III) salts, or mixtures and/or combinations thereof.
  • the rare earth-containing composition, additive, and/or particles may contain one or more rare earths, and be in any suitable form, such as a free-flowing powder, a liquid formulation, or other form.
  • Examples of rare earth-containing compositions, additives, and particles include cerium (III) oxides, cerium (IV) oxides, eerie (IV) salts (such as eerie chloride, eerie bromide, eerie iodide, eerie sulfate, eerie nitrate, eerie chlorate, and eerie oxalate), cerium (III) salts (such as cerous chloride, cerous bromide, cerous iodide, cerous sulfate, cerous nitrate, cerous chlorate, cerous chloride, and cerous oxalate), lanthanum (III) oxides, a lanthanum (III) salts (such as lanthanum chloride, lanthanum bromide, lanthanum
  • the rare earth and/or rare earth-containing composition in the rare earth-containing additive can be rare earths in elemental, ionic or compounded forms.
  • the rare earth and/or rare earth-containing composition can be contained in a fluid, such as water, or in the form of nanoparticles, particles larger than nanoparticles, agglomerates, or aggregates or combinations and/or mixtures thereof.
  • the rare earth and/or rare earth-containing composition can be supported or unsupported.
  • the rare earth and/or rare earth-containing composition can comprise one or more rare earths.
  • the rare earths may be of the same or different valence and/or oxidation states and/or numbers.
  • the rare earths can be a mixture of different rare earths, such as two or more of yttrium, scandium, cerium, lanthanum, praseodymium, and neodymium.
  • the rare earth and/or rare earth-containing composition is, in one application, a processed rare earth-containing composition and does not include, or is substantially free of, a naturally occurring and/or derived mineral.
  • the rare earth and/or rare earth-containing composition is substantially free of one or more elements in Group 1 , 2, 4-15, or 17 of the Periodic Table, and is substantially free of a radioactive species, such as uranium, sulfur, selenium, tellurium, and polonium.
  • the rare earth-containing composition comprises one or more rare earths. While not wanting to be limited by example, the rare earth-containing composition can comprise a first rare earth and a second rare earth. The first and second rare earths may have the same or differing atomic numbers.
  • the first rare earth comprises cerium (III) and the second rare earth comprises a rare earth other than cerium (III).
  • the rare earth other than cerium (III) can be one or more trivalent rare earths, cerium (IV), or any other rare other than trivalent cerium.
  • a mixture of rare earth-containing compositions can comprise a first rare earth having a +3 oxidation state and a second rare earth having a +4 oxidation state.
  • the first and second rare earths are the same and comprise cerium. More specifically, the first rare earth comprises cerium (III) and the second rare earth comprises cerium (IV).
  • the cerium is primarily in the form of a water-soluble cerium (III) salt, with the remaining cerium being present as cerium oxide, a substantially water insoluble cerium composition.
  • the cerium is primarily in the form of cerium (IV) oxide while the remaining cerium is present as a dissociated cerium (III) salt.
  • cerium (IV) oxide the remaining cerium is present as a dissociated cerium (III) salt.
  • III dissociated cerium
  • rare earth-containing compositions having a mixture of +3 and +4 oxidations states commonly at least some of the rare earth has a +4 oxidation sate, more commonly at least most of the rare earth has a +4 oxidation state, more commonly at least about 75 wt% of the rare earth has a +4 oxidation state, even more commonly at least about 90 wt% of the rare earth has a +4 oxidation state, and yet even more commonly at least about 98 wt% of the rare earth has a +4 oxidation state.
  • the rare earth-containing composition commonly includes at least about 1 ppm, more commonly at least about 10 ppm, and even more commonly at least about 100 ppm of a cerium (III) salt. While in some embodiments, the rare earth- containing composition includes at least about 0.0001 wt% cerium (III) salt, preferably at least about 0.001 wt% cerium (III) salt and even more preferably at least about 0.01 wt% cerium (III) salt calculated as cerium oxide. Moreover, in some embodiments, the rare earth composition-containing commonly has at least about 20,000 ppm cerium (IV), more commonly at least about 100,000 ppm cerium (IV) and even more commonly at least about 250,000 ppm cerium (IV).
  • the molar ratio of cerium (IV) to cerium (III) is about 1 to about 1X10 "6 , more commonly is about 1 to about 1X10 "5 , even more commonly is about 1 to about 1X10 "4 , yet even more commonly is about 1 to about 1X10 "3 , still yet even more commonly is about 1 to about 1X10 ⁇ 2 , still yet even more commonly is about 1 to about 1X10 "1 , or still yet even more commonly is about 1 to about 1.
  • the molar ratio of cerium (III) to cerium (IV) is aboutl to about 1X10 "6 , more commonly is about 1 to about 1X10 "5 , even more commonly is about 1 to about
  • 1X10 "4 yet even more commonly is about 1 to about 1X10 "3 , still yet even more commonly is about 1 to about 1X10 ⁇ 2 , still yet even more commonly is about 1 to about
  • 1X10 "1 , or still yet even more commonly is about 1 to about 1. Further, these molar ratios apply for any combinations of soluble and insoluble forms of Ce(III) and soluble and insoluble forms of Ce(IV).
  • the cerium is primarily in the form of a dissociated cerium (III) salt, with the remaining cerium being present as cerium (IV) oxide.
  • cerium (IV) oxide For rare earth- containing compositions having a mixture of +3 and +4 oxidations states commonly at least some of the rare earth has a +3 oxidation sate, more commonly at least most of the rare earth has a +3 oxidation state, more commonly at least about 75 wt% of the rare earth has a +3 oxidation state, even more commonly at least about 90 wt% of the rare earth has a +3 oxidation state, and yet even more commonly at least about 98 wt% of the rare earth has a +3 oxidation state.
  • the rare earth-containing composition commonly includes at least about 1 ppm, more commonly at least about 10 ppm, and even more commonly at least about 100 ppm cerium (IV) oxide. While in some embodiments, the rare earth- containing composition includes at least about 0.0001 wt% cerium (IV), preferably at least about 0.001 wt% cerium (IV) and even more preferably at least about 0.01 wt% cerium (IV) calculated as cerium oxide. Moreover, in some embodiments, the rare earth composition-containing commonly has at least about 20,000 ppm cerium (III), more commonly at least about 100,000 ppm cerium (III) and even more commonly at least about 250,000 ppm cerium (III).
  • the molar ratio of cerium (III) to cerium (IV) is about 1 to about 1X10 "6 , more commonly is about 1 to about 1X10 "5 , even more commonly is about 1 to about 1X10 "4 , yet even more commonly is about 1 to about 1X10 "3 , still yet even more commonly is about 1 to about 1X10 ⁇ 2 , still yet even more commonly is about 1 to about 1X10 "1 , or still yet even more commonly is about 1 to about 1.
  • the molar ratio of cerium (IV) to cerium (III) is aboutl to about 1X10 "6 , more commonly is about 1 to about 1X10 "5 , even more commonly is about 1 to about 1X10 "4 , yet even more commonly is about 1 to about 1X10 "3 , still yet even more commonly is about 1 to about 1X10 ⁇ 2 , still yet even more commonly is about 1 to about 1X10 "1 , or still yet even more commonly is about 1 to about 1. Further, these molar ratios apply for any combinations of soluble and insoluble forms of Ce(III) and soluble and insoluble forms of Ce(IV).
  • cerium (IV) compositions are: cerium (IV) dioxide, cerium (IV) oxide, cerium (IV) oxyhydroxide, cerium (IV) hydroxide, and hydrous cerium (IV) oxide.
  • cerium (III) solution sorbtion and/or precipitation chemistries such as, but not limited to, the formation of insoluble cerium oxyanion compositions.
  • cerium (IV) provides for the opportunity to take advantage of sorbtion and oxidation/reduction chemistries of cerium (IV), such as, the strong interaction of cerium (IV) with compositions such as metal and/or metalloid target material-containing species.
  • cerium (IV) is also referred to as cerium (+4) and/or eerie.
  • the rare earth composition comprises a water-soluble rare earth composition having a +3 oxidation state.
  • suitable water-soluble rare earth compositions include rare earth chlorides, rare earth bromides, rare earth iodides, rare earth astatides, rare earth nitrates, rare earth sulfates, rare earth oxalates, rare earth perchlorates, rare earth carbonates, and mixtures thereof.
  • the rare earth-containing additive includes water-soluble cerium (III) and lanthanum (III) compositions.
  • the water-soluble cerium composition comprises cerium (III) chloride, CeCl 3 . Commonly, cerium (III) is also referred to as cerium (+3) and/or cerous.
  • the rare earth composition comprises a water-soluble cerium +3 composition.
  • suitable water-soluble cerium +3 compositions are cerium (III) chloride, cerium (III) nitrate, cerium (III) sulfate, cerium (III) oxalate, and a mixture thereof.
  • the water-soluble cerium (III) composition may comprise, in addition to cerium, one or more other water soluble rare earths.
  • the rare earths other than cerium include yttrium, scandium, lanthanum, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, and lutetium.
  • the other rare earths may and may not be water-soluble.
  • the water-soluble cerium-containing additive contains water- soluble cerium (III) and one or more other water-soluble trivalent rare earths (such as, but not limited to, one or more of lanthanum, neodymium, praseodymium and samarium).
  • the molar ratio of cerium (III) to the other trivalent rare earths is commonly at least about
  • the water-soluble cerium-containing additive contains cerium (III) and one or more of water-soluble lanthanum, neodymium, praseodymium and samarium.
  • the water-soluble rare earth-containing additive commonly includes at least about 0.01 wt.% of one or more of lanthanum, neodymium, praseodymium and samarium.
  • the water-soluble rare earth-containing additive commonly has on a dry basis no more than about 10 wt.% La, more commonly no more than about 9 wt.% La, even more commonly no more than about 8 wt.% La, even more commonly no more than about 7 wt.% La, even more commonly no more than about 6 wt.% La, even more commonly no more than about 5 wt.% La, even more commonly no more than about 4 wt.% La, even more commonly no more than about 3 wt.%> La, even more commonly no more than about 2 wt.% La, even more commonly no more than about I wt.% La, even more commonly no more than about 0.5 wt.% La, and even more commonly no more than about 0.1 wt.%> La.
  • the water-soluble rare earth-containing additive commonly has on a dry basis no more than about 8 wt.% Nd, more commonly no more than about 7 wt.% Nd, even more commonly no more than about 6 wt.% Nd, even more commonly no more than about 5 wt.% Nd, even more commonly no more than about 4 wt.% Nd, even more commonly no more than about 3 wt.%> Nd, even more commonly no more than about 2 wt.%> Nd, even more commonly no more than about 1 wt.% Nd, even more commonly no more than about 0.5 wt.%) Nd, and even more commonly no more than about 0.1 wt.% Nd.
  • the water- soluble rare earth-containing additive commonly has on a dry basis no more than about 5 wt.%) Pr, more commonly no more than about 4 wt.%> Pr, even more commonly no more than about 3 wt.% Pr, even more commonly no more than about 2.5 wt.% Pr, even more commonly no more than about 2.0 wt.% Pr, even more commonly no more than about 1.5 wt.% Pr, even more commonly no more than about 1.0 wt.% Pr, even more commonly no more than about 0.5 wt.% Pr, even more commonly no more than about 0.4 wt.% Pr, even more commonly no more than about 0.3 wt.%) Pr, even more commonly no more than about 0.2 wt.% Pr, and even more commonly no more than about 0.1 wt.% Pr.
  • the water- soluble rare earth-containing additive commonly has on a dry basis no more than about 3 wt.% Sm, more commonly no more than about 2.5 wt.% Sm, even more commonly no more than about 2.0 wt.% Sm, even more commonly no more than about 1 .5 wt.% Sm, even more commonly no more than about 1.0 wt.% Sm, even more commonly no more than about 0.5 w r t.% Sm, even more commonly no more than about 0.4 wt.% Sm, even more commonly no more than about 0.3 wt.% Sm, even more commonly no more than about 0.2 wt.% Sm, even more commonly no more than about 0.1 wt.% Sm, even more commonly no more than about 0.05 wt.% Sm, and even more commonly no more than about 0.01 wt.% Sm.
  • the water-soluble cerium-containing additive contains water- soluble cerium (III) and one or more other water-soluble trivalent rare earths (such as one or more of lanthanum, neodymium, praseodymium and samarium).
  • the molar ratio of cerium (III) to the other trivalent rare earths is commonly at least about 1 : 1, more commonly at least about 10: 1, more commonly at least about 15: 1, more commonly at least about 20: 1, more commonly at least about 25: 1, more commonly at least about 30: 1, more commonly at least about 35: 1, more commonly at least about 40: 1, more commonly at least about 45: 1, and more commonly at least about 50: 1.
  • the rare earth-containing additive consists essentially of a water-soluble cerium (III) salt, such as a cerium (III) chloride, cerium (III) bromide, cerium (III) iodide, cerium (III) astatide, cerium perhalogenates, cerium (III) carbonate, cerium (III) nitrate, cerium (III) sulfate, cerium (III) oxalate and mixtures thereof.
  • a water-soluble cerium (III) salt such as a cerium (III) chloride, cerium (III) bromide, cerium (III) iodide, cerium (III) astatide, cerium perhalogenates, cerium (III) carbonate, cerium (III) nitrate, cerium (III) sulfate, cerium (III) oxalate and mixtures thereof.
  • the rare earth in this formulation commonly is primarily cerium (III), more commonly at least about 75 mole% of the rare earth content of the rare earth-containing additive is cerium (III), that is no more than about 25 mole% of the rare earth content of the rare earth- containing additive comprises rare earths other than cerium (III). Even more commonly, the rare earth in this formulation commonly is primarily at least about 80 mole% cerium (III), yet even more commonly at least about 85 mole% cerium (III), still yet even more commonly at least about 90 mole% cerium (III), and yet still even more commonly at least about 95 mole% cerium (III).
  • the rare earth composition may comprise a water insoluble composition, such as a water-insoluble rare earth oxide, oxyhydroxide, and/or hydrous oxide.
  • the insoluble rare earth composition may be in the form of a dispersion, suspension or slurry of rare earth particulates.
  • the rare earth particulates can have an average particle size ranging from the sub-micron, to micron or greater than micron.
  • the insoluble rare earth composition may have a surface area of at least about 1 m 2 /g. Commonly, the insoluble rare earth has a surface area of at least about 70 m 2 /g. In another formulation, the insoluble rare earth composition may have a surface area from about 25 m 2 /g to about 500 m 2 /g.
  • the rare earth composition may be agglomerated.
  • the rare earth composition may be in the form of agglomerate
  • the rare earth-containing additive comprises a rare earth and/or rare earth-containing composition comprising at least some water insoluble cerium (IV) and water-soluble cerium (III) and/or lanthanum (III).
  • the rare earth and/or rare earth- containing composition comprise at least some water-soluble cerium (III), typically in the form of water-soluble cerium (III) salt.
  • the rare earth-containing additive comprises more than about 1 wt.% of a water-soluble cerium (III) composition, more commonly more than about 5 wt.% of a water-soluble cerium (III) composition, even more commonly more than about 10 wt.% of a water-soluble cerium (III) composition, yet even more commonly more than about 20 wt.% of a water-soluble cerium (III) composition, still yet even more commonly more than about 30 wt.% of a water-soluble cerium (III) composition, or still yet even more commonly more than about 40 wt.% of a water-soluble cerium (III) composition.
  • the rare earth-containing additive typically comprises more than about 50 wt.% of a water-soluble cerium (III) composition, more typically the rare earth-containing additive comprises more than about 60 wt.% of a water- soluble cerium (III) composition, even more typically the rare earth-containing additive comprises more than about 65 wt.% of a water-soluble cerium (III) composition, yet even more typically the rare earth-containing additive comprises more than about 70 wt.% of a water-soluble cerium (III) composition, still yet even more typically the rare earth- containing additive comprises more than about 75 wt.% of a water-soluble cerium (III) composition, still yet even more typically the rare earth-containing additive comprises more than about 80 wt.% of a water-soluble cerium (III) composition, still yet even more typically the rare earth-containing additive comprises more than about 85 wt.% of a water- soluble cerium (III) composition, still yet even more typically the rare earth-containing additive comprises more than about 90
  • the rare earth-containing additive comprises one or more nitrogen-containing materials.
  • the one or more nitrogen-containing materials commonly, comprise one or more of ammonia, an ammonium-containing composition, a primary amine, a secondary amine, a tertiary amine, an amide, a cyclic amine, a cyclic amide, a polycyclic amine, a polycyclic amide, and combinations thereof.
  • the nitrogen-containing materials are typically less than about 1 ppm, less than about 5 ppm, less than about 10 ppm, less than about 25 ppm, less than about 50 ppm, less about 100 ppm, less than about 200 ppm, less than about 500 ppm, less than about 750 ppm or less than about 1000 ppm of the water-soluble rare earth-containing additive.
  • the rare earth-containing additive comprises a water-soluble cerium (III) and/or lanthanum (III) composition. More commonly, the rare earth-containing additive comprises cerium (III) chloride.
  • the rare earth-containing additive is typically dissolved in a liquid.
  • the liquid is the rare earth- containing additive is dissolved in is preferably water.
  • the rare earth-containing additive is in the form of one or more of: an aqueous solution containing substantially dissociated, dissolved forms of the rare earths and/or rare earth-containing compositions; free flowing granules, powder, particles, and/or particulates of rare earths and/or rare earth-containing compositions containing at least some water-soluble cerium (III); free flowing aggregated granules, powder, particles, and/or particulates of rare earths and/or rare earth-containing
  • free flowing agglomerated granules, powder, particles, and/or particulates comprising a binder and rare earths and/or rare earth-containing compositions one or both of in an aggregated and non-aggregated form and containing at least some water-soluble cerium (III); rare earths and/or rare earth-containing compositions containing at least some water-soluble cerium (III) and supported on substrate; and combinations thereof.
  • the particles in one formulation, have a particle size may be from about 1 nanometer to about 1000 nanometers. In another embodiment the particles may have a particle size less than about 1 nanometer. In yet another embodiment the particles may have a particle size from about 1 micrometer to about 1,000 micrometers.
  • suitable substrates can include porous and fluid permeable solids having a desired shape and physical dimensions.
  • the substrate for example, can be a sintered ceramic, sintered metal, micro-porous carbon, glass fiber, celiuiosic fiber, alumina, gamma-alumina, activated alumina, acidified alumina, a metal oxide containing labile anions, crystalline alumino-silicate such as a zeolite, amorphous silica-alumina, ion exchange resin, clay, ferric sulfate, porous ceramic, and the like.
  • Such substrates can be in the form of mesh, such as screens, tubes, honeycomb stmctures, monoliths, and blocks of various shapes, including cylinders and toroids.
  • the structure of the substrate will vary depending on the application. Suitable structural forms of the substrate can include a woven substrate, non-woven substrate, porous membrane, filter, fabric, textile, or other fluid permeable structure.
  • the rare earth-containing additive can be incorporated into or coated onto a filter block or monolith for use as a filter, such as a cross-flow type filter.
  • the rare earth and/or rare earth-containing additive can be in the form of particles coated on to or incorporated in the substrate. In some configurations, the rare earth and/or rare earth-containing additive can be ionicaliy substituted for cations in the substrate.
  • the rare earth-coated substrate comprises_at least about 0.1% by weight, more typically 1% by weight, more typically at least about 5% by weight, more typically at least about 10% by weight, more typically at least about 15% by weight, more typically at least about 20% by weight, more typical ly at least about 25% by weight, more typically at least about 30% by weight, more typical ly at least about 35%» by weight, more typically at least about 40% by weight, more typically at least about 45% by weight, and more typically at least about 50%> by weight rare earth and/or rare earth-containing composition.
  • the rare earth-coated substrate includes no more than about 95% by weight, more typically no more than about 90% by weight, more typically no more than about 85% by weight, more typically no more than about 80 > by weight, more typically no more than about 75% by weight, more typical ly no more than about 70% by weight, and even more typically no more than about 65 %> by weight rare earth and/or rare earth-containing composition.
  • the rare earth-containing additive includes a rare earth-containing composition supported on, coated on, or incorporated into a substrate, preferably the rare earth-containing composition is in the form of particulates.
  • the rare earth-containing particulates can, for example, be supported or coated on the substrate with or without a binder.
  • the binder may be any suitable binder, such as those set forth herein.
  • formulations comprising the rare earth-containing additive comprising rare earth-containing granules, powder, particles, and/or particulates agglomerated and/or aggregated together with or without a binder
  • such formulations commonly have a mean, median, or P 90 part icle size of at least about 1 ⁇ , more commonly at least about 5 ⁇ , more commonly at least about 1 0 ⁇ , still more commonly at least about 25 ⁇ .
  • the rare earth-containing agglomerates or aggregates have a mean, median, or P90 particle size distribution from about 100 to about 5,000 microns; a mean, median, or P90 particle size distribution from about 200 to about 2,500 microns; a mean, median, or P90 particle size distribution from about 250 to about 2,500 microns; or a mean, median, or P.*, particle size distribution from about 300 to about 500 microns.
  • the agglomerates and/or aggregates can have a mean, median, or P90 particle size distribution of at least about 100 nm, specifically at least about 250 nm, more speci ically at least about 500 nm, even more specifically at least about 1 ⁇ and yet even more specifically at least about 0.5 nm, the mean, median, or P90 particle size distribution of the agglomerates and/or aggregates can be up to about 1 micron or more.
  • the rare earth-containing particulates individually and/or in the form of agglomerates and/or aggregates, can have in some cases a surface area of at least about 5 m7g, in other cases at least about 10 m 2 /g, in other cases at least about 70 m 2 /g, in yet other cases at least about 85 m 2 /g, in still yet other cases at least about 100 m7g, in still yet other cases at least about 115 m 2 /g, in still yet other cases at least about 125 m 2 /g, in still yet other cases at least about 150 m 2 /g, in still yet other cases at least 300 m 2 /g, and in still yet other cases at least about 400 m 2 /g.
  • the rare earth-containing particulates individually and/or i the form of agglomerates or aggregates commonly can have a surface area from about 50 to about 500 m g, or more commonly from about 110 to about 250 m 2 /g.
  • the rare earth- containing agglomerate includes more than 10.01wt.%, more commonly more than about 85 wt.%, even more commonly more than about 90 wt.%, yet even more commonly more than about 92 wt.% and still yet even more commonly from about 95 to about 96.5 wt.% rare earth-containing particulates, with the balance being primarily the binder.
  • the binder can be less than about 15%> by weight of the agglomerate, in some cases less than about 10% by weight, in still other cases less than about 8% by weight, in still other cases less than about 5% by weight, and in still other cases less than about 3.5% by weight of the agglomerate.
  • the rare earth-containing particulates are in the form of powder and have aggregated nano-crystalline domains.
  • the binder can include one or more polymers selected from the group consisting of thermosetting polymers, thermoplastic polymers, elastomeric polymers, cellulosic polymers and glasses.
  • the binder comprises a fl uorocarbon-contai n i ng polymer and/or an acry ic- polymcr.
  • the rare earth-containing composition is in the form of a colloid, suspension, or slurry of particulates.
  • the particulates commonly can have a mean, median and/or P90 particle size of less than about 1 nanometer, more commonly a mean, median and/or P 90 particle size from about 1 nanometer to about 1,000 nanometers, even more commonly a mean, median and/or P90 particle size from about 1 micron to about 1,000 microns, or yet even more commonly a mean, median and/or P90 particle size of at least about 1,000 microns.
  • the particulates have a mean, median and/or P90 particle size from about 0.1 to about 1,000 nm, more preferably from about 0.1 to about 500 nm. Even more preferably, the cerium (IV) particulates have a mean, median and/or P90 particle size from about 0.2 to about 100 nm.
  • the particulates may have a mean and/or median surface area of at least about 1 m 2 /g, preferably a mean and/or median surface area of at least about 70 m 2 /g. In other embodiments, the particulates may preferably have a mean and/or median surface area from about 25 m 2 /g to about 500 m 2 /g and more preferably, a mean and/or median surface area of about 100 to about 250 m 2 /g. In some embodiments, the particulates may be in the form of one or more of a granule, crystal, crystallite, and particle.
  • the particulates comprise cerium (IV), typically as cerium (IV) oxide.
  • the weight percent (wt.%) cerium (IV) content based on the total rare earth content of the cerium (IV) particulates typically is at least about 50 wt.% cerium (IV), more typically at least about 60 wt.% cerium (IV), even more typically at least about 70 wt.% cerium (IV), yet even more typically at least about 75 wt.% cerium (IV), still yet even more typically at least about 80 wt.% cerium (IV), still yet even more typically at least about 85 wt.%) cerium (IV), still yet even more typically at least about 90 wt.% cerium (IV), still yet even more typically at least about 95 wt.% cerium (IV), and even more typically at least about 99 wt.% cerium (IV).
  • the cerium (IV) particulate is substantially devoid of rare earths other than cerium (IV). More preferably, the weight percent (wt.%) cerium (IV) content based on the total rare earth content of the cerium (IV) particulates is about 100 wt.% cerium (IV) and comprises one or more of cerium (IV) oxide, cerium (IV) hydroxide, cerium (IV) oxyhydroxyl, cerium (IV) hydrous oxide, cerium (IV) hydrous oxyhydroxyl, Ce0 2 , and/or Ce(IV)(0) w (OH) x (OH) y zH 2 0, where w, x, y and can be zero or a positive, real number.
  • the Medium (or Media) 104 can be any fluid stream.
  • the fluid stream may be derived from any source containing one or more target materials.
  • the medium (or media) 104 is derived from any aqueous source containing one or more target materials.
  • a suitable medium (or media) 104 is recreational waters, municipal waters (such as, sewage, waste, agricultural, or ground waters), industrial (such as cooling, boiler, or process waters), wastewaters, well waters, septic waters, drinking waters, naturally occurring waters, (such as a lake, pond, reservoir, river, or stream), and/or other waters and/or aqueous process streams.
  • Non-limiting examples of recreational waters are swimming pool waters, brine pool waters, therapy pool waters, diving pool waters, sauna waters, spa waters, and hot tub waters.
  • Non-limiting examples of municipal waters are drinking waters, waters for irrigation, well waters, waters for agricultural use, waters for architectural use, reflective pool waters, water-fountain waters, water-wall waters, use, non-potable waters for munici al use and other non-potable munici al waters.
  • Wastewaters include without limitation, municipal and/or agricultural run-off waters, septic waters, w aters formed and/or generated during an industrial and/or manufacturing process, waters formed and/or generated by a medical facility, waters associated with mining, mineral production, recovery and/or processing (including petroleum), evaporation pound waters, and non- potable disposal waters.
  • Well waters include without limitation waters produced from a subsurface well for the purpose of human consumption, agricultural use (including consumption by a animal, irrigation of crops or consumption by domesticated farm animals), mineral-containing waters, waters associated with mining and petroleum production.
  • Naturally occurring waters include associated with rains, storms, streams, rivers, lakes, aquifers, estuaries, lagoons, and such.
  • the medium (or media) 104 is typically obtained from one or more of the above sources and processed, conveyed and/or manipulated by a water handling system.
  • the medium (or media) can be primarily the water in a water handling system.
  • the water handling system components and configuration can vary depending on the treatment process, water, and water source. While not wanting to limited by example, municipal and/or wastewater handling systems typically one or more of the following process units: clarifying, disinfecting, coagulating, aerating, filtering, separating solids and liquids, digesting, and polishing. The number and ordering of the process units can vary. Furthermore, some process units may occur two or more times within a water handling system. It can be appreciated that the one or more process units are in fluid communication.
  • the water handling system may or may not have a clarifier.
  • Some water handling systems may have more than one clarifier, such as primary and final clarifiers.
  • Clarifiers typical ly reduce cloudiness of the water by removing biological matter (such as bacteria and or algae), suspended and/or dispersed chemicals and/or particulates from the water. Common ly a clarification process occurs before a d/or after a filtration process.
  • the w ater handling system may or may not contain a filtering process.
  • the water handling system contains at least one filtering process.
  • filtering processes include without limitation screen filtration, trickling filtration, particulate filtration, sand filtration, macro-filtration, micro-filtration, ultrafiltration, nano-filtration, reverse osmosis, carbon activated carbon filtration, dual media filtration, gravity filtration and combinations thereof.
  • a filtration process occurs before and/or after a disinfection process.
  • a filtration process to remove solid debris, such as solid organic matter and grit from the water typically precedes the disinfection process.
  • a filtration process such as an activated carbon and/or sand filtrations follows the disinfection process.
  • the post- disinfection fi ltration process removes at least some of the chemical disinfectant remaining in the treated water.
  • the water handl ing system may or may not include a disinfection process.
  • the disinfection process may include without limitation treating the aqueous stream and/or w ater with one or more of fluorine, fluorination, chlorine, chlorination, bromine, bromi nation, iodine, iodination, ozone, ozonation, electromagnetic irradiation, ultra-violet light, gama rays, electrolysis, chlorine dioxide, hypochlorite, heat, ultrasound,
  • the water handling system contains a single disinfection process, more preferably the water handling system contains two or more disinfection processes.
  • Disinfection process are typically provided to one of at least remove, kil l and/or detoxify pathogenic material contained in the water.
  • the pathogenic material comprises biological contaminants, in particular biological contaminants comprising the target materials.
  • the disinfection process converts the target material species into a species that can be removed and or detoxified by the rare earth-containing composition, additive, and/or particle or particulate.
  • the water handling system may or may not include coagulation.
  • the water handling system may contain one or more coagulation processes.
  • the coagulation process includes adding a flocculent to the water in the water handling system.
  • Typical flocculants include aluminum sulfate, poryelectrolytes, polymers, lime and ferric chloride.
  • the flocculent aggregates the particulate matter suspended and/or dispersed in the water, the aggregated particulate matter forms a coaguium.
  • the coagulation process may or may not include separating the coaguium from the liquid phase.
  • coagulation may comprise part, or ail, the entire clarification process.
  • the coagulation process is separate and distinct from the clarification process. Typically, the coagulation process occurs before the disinfection process.
  • the water handling system may or may not include aeration.
  • aeration comprises passing a stream of air and/or molecular oxygen through the water contained in the water handling system.
  • the aeration process promotes oxidation of contaminants contained in the water being processed by the water handling system, preferably the aeration promotes the oxidation of biological contaminates, such as target materials.
  • the aeration process converts the target material species into a species that can be removed and/or detoxified by the rare earth-containing composition, additive, and/or particle or particulate.
  • the water handling system may contain one or more aeration processes. Typically, the disinfection process occurs after the aeratio process.
  • the water handling system may or may not have one or more of a heater, a cooler, and a heat exchanger to heat and/or cool the water being processed by the water handling system.
  • the heater may be any method suitable for heating the water.
  • suitable heating processes are solar heating systems, electromagnetic heating systems (such as, induction heating, microwave heating and infrared), immersion heaters, and thermal transfer heating systems (such as, combustion, stream, hot oil, and such, where the thermal heating source has a higher temperature than the water and transfers heat to the water to increase the temperature of the water).
  • the heat exchanger can be any process that transfers thermal energy to or from the water.
  • the heat exchanger can remove thermal energy from the water to cool and/or decrease the temperature of the water.
  • the heat exchanger can transfer thermal energy to the water to heat and/or increase the temperature of the water.
  • the cooler may be any method suitable for cooling the water.
  • suitable cooling process are refrigeration process, evaporative coolers, and thermal transfer cooling systems (such as, chillers and such where the thermal (cooling) source has a lower temperature than the water and removes heat from the water to decrease the temperature of the water).
  • Any of the clarification, disinfection, coagulation, aeration, filtration, sludge treatment, digestion, nutrient control, solid/liquid separation, and/or polisher processes may further include before, after and/or during one or both of a heating a d cooling process. It can be appreciated that a heat exchanger typically includes at least one of heating and cooling process.
  • the water handling system may or may not include a digestion process.
  • the digestion process is one of an anaerobic or aerobic digestion process.
  • the digestion process may include one of an anaerobic or aerobic digestion process followed by the other of the anaerobic or aerobic digestion processes.
  • one such configuration can be an aerobic digestion process followed by an anaerobic digestion process.
  • the digestion process comprises microorganisms that breakdown the biodegradable material contained in the water.
  • the biodegradable material includes a target material.
  • the digestion process converts the target material species into a species that can be removed and/or detoxified by the rare earth-containing composition, additive, and/or particle or particulate.
  • the anaerobic digestion of biodegradable material proceeds in the absence of oxygen, while the aerobic digestion of biodegradable material proceeds in the presence of oxygen.
  • the digestion process is typically referred to as biological stage/ digester or biological treatment stage/digester.
  • the disinfection process comprises a digestion process.
  • the water handling system may or may not include a nutrient control process.
  • the water handling system may include one or more nutrient control processes.
  • the nutrient control process typically includes nitrogen and/or phosphorous control.
  • nitrogen control commonly may include nitri ying bacteria.
  • phosphorous control refers to biological phosphorous control, preferably controlling phosphorous that can be used as a nutrient for algae.
  • Nutrient control typically includes processes associated with control of oxygen demand substances, which include in addition to nutrients, pathogens, and inorganic and synthetic organic compositions. The nutrient control process can occur before or after the disinfection process.
  • the nutrient control process converts the target material species into a species that can be removed and/or detoxified by the rare earth-containing composition, additive, and/or particle or particulate.
  • the water handling system may or may not include a solid/liquid separation process.
  • the water handling system includes one or more solid/liquid separation processes.
  • the solid/liquid separation process can comprise any process for separating a solid phase from a liquid phase, such as water.
  • Non-limiting examples of suitable solid liquid separation processes are clarification (including trickling filtration), filtration (as described above), vacuum and/or pressure filtration, cyclone (including hydrocyclones), floatation, sedimentation (including gravity sedimentation), coagulation (as described above), sedimentation (including, but not limited to grit chambers), and combinations thereof.
  • the water handling system may or may not include a polisher.
  • the polishing process can include one or more of removing fine particulates from the water, an ion- exchange process to soften the water, an adjustment to the pH value of the water, or a combination thereof.
  • the polishing process is after the disinfection step.
  • the water handling system may further include additional processing equipment.
  • the additional processing equipment includes without limitation holding tanks, reactors, purifiers, treatment vessels or units, mixing vessels or elements, wash circuits, precipitation vessels, separation vessels or units, settling tanks or vessels, reservoirs, pumps, cooling towers, heat exchangers, valves, boilers, gas liquid separators, nozzles, tenders, and such.
  • the water handling system includes conduit(s) interconnecting the unit operations and/or additional processing equipment.
  • the conduits include without limitation piping, hoses, channels, aqua-ducts, ditches, and such. The water is conveyed to and from the unit operations and/or additional processing equipment by the conduit(s).
  • each unit operations and/or additional processing equipment is in fluid communication with the other unit operations and/or additional processing equipment by the conduits.
  • the aqueous medium that is treated by the rare earth-containing composition, additive, and/or particles may contain one or more target materials.
  • the one or more target material-containing species may include metals (other than scandium, yttrium and lanthanoids), metalloids, and/or radioactive isotopes in various forms.
  • the target material-containing species include, without limitation, a hydrated metal (including without limitation alkali metals, alkaline earth metals, actinoids, transition metals, and post-transition metals and excluding scandium, yttrium and lanthanoids), metalloid, and/or radioactive isotope, a hydrated metal, metalloid, or radioactive isotope oxyspecies in the form of an anion, cation, or having no net charge (e.g., M a O x n+ or M a O x ° where 0 ⁇ a ⁇ 4, 0 ⁇ x ⁇ 4, and 0 ⁇ n ⁇ 6), a positively, negatively, or uncharged metal, metalloid, or radioactive isotope carbonate (e.g., M c (C03) y where 0 ⁇ c ⁇ 4 and 0 ⁇ y ⁇ 4), or a positively, negatively, or uncharged metal, metalloid, or radioactive isotope carbonate
  • the rare earth-containing composition removes anionic, cationic, oxy, hydroxyl, hydrated, or a combination thereof species of a target material, where the target material "M" has an atomic number of 5, 13, 22-33, 40-52, 72-84, and 89- 94.
  • Examples of hydrated hydroxyl and hydrated oxy compounds include, but are not limited to, M(H 2 0) 6 n , M(H 2 0) 5 OH (n l) , M(OH) (n l) M(H 2 0) 4 (OH) 2 (n 2) , M(OH) 2 (n 2) , M(H 2 0) 3 (OH) 3 (n"3) , M(OH) 3 (n 3) , M(H 2 0) 2 (OH) 4 (n 4) , M(OH) 4 (n 4) , M(H 2 0)(OH) 5 (n 5) , M(OH) 5 (n 5) , M(OH) 6 (n 6) , M(H 2 0) 5 0 (n 2) , MO (n 2) , M(H 2 0) 4 (0) 2 (n 4) , M0 2 (n 4) ,
  • n is a real number no greater than eight and represents the charge or oxidation state of the metal or metalloid "M" (for example when M is Pb(II) n is 2, and when M is Pb(IV) n is 4). In general, M has a positive charge "n" no greater than about 8.
  • Figures 2-47 depict the primary species of target material under different thermodynamic conditions of an aqueous solution.
  • the target material lead has the following species: Pb(H 2 0) 6 2+ , Pb(H 2 0) 4 (0) 2 ,
  • the lead comprises lead having a +2 oxidation state.
  • the target material antimony has the following species: SbCBtOHOHV " , Sb(H 2 0) 4 (OH) 2 1+ , Sb(H 2 0) 3 (OH) 3 , Sb(H 2 0)(OH) 5 , and Sb(OH)6 1 _ .
  • the antimony comprises antimony having one of a +5 or +3 oxidation state.
  • the target material bismuth has the following species: Bi(H 2 0) 6 3+ , Bi(H 2 0) 5 (OH) 2+ , Bi(H 2 0) 4 (OH) 2 1+ , Bi(H 2 0) 3 (OH) 3 , and
  • the bismuth comprises bismuth having one of a +5 or +3 oxidation state.
  • the precise mechanism may depend on a number of variables including the particular form and/or characteristics of the rare earth-containing composition, additive, and/or particle or particulate, the particular form and/or characteristics of the target material, the pH of the medium 104, the Eh of the medium 104, the temperature of the medium 104, the components in the medium 104, and other parameters known to those of skill in the art.
  • the anionic form of the target material may be one or more of sorbed, precipitated, complexed, ionically bound, inter- valance shell complexed (with any one or more hybridized or non-hybridized s, p, d or f orbitals), covalently bounded or a combination thereof with the rare earth-containing composition.
  • the anionic forms may comprise an oxyanion, hydroxyl, hydrated or combination thereof of the target material having a net negative charge.
  • the target material may selectively interact with a face or an edge of rare earth-containing composition particulate.
  • the anionic target material forms a substantially insoluble product with a rare earth.
  • the rare earth may be in the form of a substantially water soluble rare earth-containing salt or in the form of a substantially water insoluble material that strongly sorbs, binds, chemically reacts or such with the anionic target material.
  • the cationic forms may comprise complexed, hydroxyl, hydrated or combination thereof of the target material having a net positive charge.
  • the cationic form of the target material may be one or more of sorbed, precipitated, complexed, ionically bound, inter-valance shell complexed (with any one or more hybridized or non-hybridized s, p, d or f orbitals), covalently bounded or a combination thereof with the rare earth-containing composition.
  • the target material may selectively interact with a face or an edge of rare earth-containing composition particulate.
  • Another theory, which we do not wish to be bound by, is that the cationic target material form a substantially insoluble and/or stable product with rare earth cation.
  • a species such as a water of hydration, hydroxyl radical, hydroxide ion, or carbonate species, compounded, complexed, or otherwise attached to the target material acts as a chemical entity that attaches, sorbs and/or chemically bonds to the rare earth or rare earth- containing composition.
  • a possible cationic metal or metalloid adsorption process may comprise, as show in chemical e uation (2):
  • the rare earth may be in the form of a substantially water soluble rare earth- containing salt or in the form of a substantially water insoluble material that strongly sorbs, binds, chemically reacts or otherwise attaches to the cationic target material, as shown in chemical equation (3).
  • M has an atomic number commonly of one of 5, 13, 22-33, 40-52, 72-84, and 89- 94 and more commonly one of 5, 13, 22 to 33, 40 to 52, 56, 72, 80-84, 88, and 90-94.
  • the number of waters of hydration is shown as "4" for ceria oxide, it is to be understood that more or less waters of hydration may be present depending on the application.
  • a possible cationic lead adsor tion process may comprise, as show in chemical equation (4): + 2 H 2 0
  • the rare earth cations may be in the form of a substantially water soluble rare earth-containing salt or in the form of a substantially water insoluble material that strongly sorbs, binds, chemically reacts or such with the cationic target material, as shown in chemical equation (5).
  • the rare earth-containing additive such as cerium (IV) oxide
  • cerium (IV) oxide may oxidize the target material and/or target material-containing species.
  • the contacting of the rare earth-containing oxidizing agent and the target material-containing species may one or both: a) chemically interact with the target material-containing species and b) form a reduced rare earth and/or rare earth-containing oxidizing agent and an oxidized target material and/or target material-containing species.
  • a cerium (IV) oxidizing agent may be formed by contacting a first cerium-containing composition having cerium in a +3 oxidation state with an oxidant (as listed below) to form a second cerium-containing composition having cerium in a +4 oxidation state (or cerium (IV) oxidizing agent).
  • the second cerium-containing composition comprises Ce0 2 particles.
  • the cerium (IV) oxidizing agent then oxidizes the target material or target material-containing species forming the first (reduced) cerium (Ill)-containing composition.
  • the rare earth- and target material-containing product can be in the form of a material dissolved in the water or a solid material either contained within the water or a solid material phase separated from the water.
  • the solid rare earth- and target material-containing product may be a precipitate, a solid particle suspended within the water, a flocculated solid particle, and combination thereof.
  • the primary species of a metal or metalloid in solution depends on pH and Eh. The values are commonly selected such that the water is electrochemically stable and the target material is a dissolved (not solid) species.
  • Cationic forms of lead for example, typically, but not necessarily, are present, as the primary species, in aqueous media having a pH of less than about pH 7 and Eh of less than about +1 V.
  • the form of metal or metalloid present in solution and therefore the efficacy of precipitating, sorbing, or otherwise removing the metal or metalloid from, and/or de-toxifying, the aqueous medium by treatment with the rare earth-containing composition, additive, and/or particle or particulate can be increased substantially by adjusting one or both of the pH and Eh of the medium.
  • the efficacy of precipitating, sorbing, or removing the target material has been illustrated for various pH and Eh values, the concept of adjusting one or both of pH and Eh is applicable for effectively removing and/or detoxifying an aqueous solution for components, including interferents, other than the metal and/or metalloid-containing target materials.
  • the target material is removed from the aqueous media having a selected pH value.
  • the selected pH value of the aqueous media may be from about pH 0 to about pH 14, more commonly the pH of the aqueous media may be from about pH 1 to about pH 13, even more commonly the pH of the aqueous media may be from about pH 2 to about pH 12, even more commonly the pH of the aqueous media may be from about pH 3 to about pH 11 , yet even more commonly the pH of the aqueous media may be from about pH 4 to about pH 10, still yet even more commonly the pH of the aqueous media may be from about pH 5 to about pH 9, or still yet even more commonly the pH of the aqueous media may be from about pH 6 to about pH 8.
  • the aqueous media typically has a selected pH value of from about pH 6 to about pH 9, and more typically the aqueous media has a pH of from about pH 6.5 to about pH 8.5
  • the aqueous media may be substantially acidic having a selected pH of about pH 0, more commonly having a selected pH of about pH 1, even more commonly having a selected pH of about pH 2, yet even more commonly having a selected pH of about pH 3, or still yet even more commonly having a selected pH about pH 4.
  • the aqueous media may be substantially neutral having a selected pH of about pH 5, more commonly having a selected pH of about pH 6, even more commonly having a selected pH of about pH 7, yet even more commonly having a selected pH of about pH 8, or still yet even more commonly having a selected pH of about pH 9.
  • the aqueous media may be substantially basic having a selected pH of about pH 10, more commonly having a selected pH of about pH 11 , even more commonly having a selected pH of about pH 12, yet even more commonly having a selected pH of about pH 13, or still yet even more commonly having a selected pH about pH 14.
  • the target material is removed from the aqueous media having a selected Eh value with respect to standardized reference electrode, such as a standard hydrogen electrode (SHE).
  • standardized reference electrode such as a standard hydrogen electrode (SHE).
  • the selected Eh of the aqueous medium is at least about -0.5 V, more commonly at least about -0.4 V, more commonly at least about -0.3 V, more commonly at least about -0.2 V, more commonly at least about -0.1 V, more commonly at least about 0 V, more commonly at least about 0.1 V, more commonly at least about 0.2 V, more commonly at least about 0.3 V, and more commonly at least about 0.4 V, and more commonly at least about 0.5 V.
  • the selected Eh of the aqueous medium is below the level at which water is not
  • electrochemically stable more commonly no more than about 1.7 V, more commonly no more than about 1.6 V, more commonly no more than about 1.5 V, more commonly no more than about 1.4 V, more commonly no more than about 1.3 V, more commonly no more than about 1.2 V, more commonly no more than about 1.1 V, more commonly no more than about 1.0 V, more commonly no more than about 0.9 V, more commonly no more than about 0.8 V, and more commonly no more than about 0.7 V.
  • the rare earth to target material ratio of the insoluble rare earth- and target material-containing product can also vary depending on the solution pH and/or Eh value.
  • rare earths having a rare earth to target material ratio less than 1 have a greater molar removal capacity of target material than rare earths having a rare earth to target material ratio of 1 or more than 1.
  • the greater the pH value the greater the rare earth to target material ratio.
  • the greater the pH value the smaller the rare earth to target material ratio.
  • the rare earth to target material ratio is substantially unchanged over a range of pH values.
  • the rare earth to target material ratio is no more than about 0.1, the rare earth to target material ratio is no more than about 0.2, the rare earth to target material ratio is no more about 0.3, the rare earth to target material ratio is no more than about 0.4, the rare earth to target material ratio is no more than about 0.5, the rare earth to target material ratio is no more than about 0.6, the rare earth to target material ratio is no more than about 0.7, the rare earth to target material ratio is no more than about 0.8, the rare earth to target material ratio is no more than about 0.9, the rare earth to target material ratio is no more than about 1.0, the rare earth to target material ratio is no more than about 1.1, the rare earth to target material ratio is no more than about 1.2, the rare earth to target material ratio is no more than about 1.3, the rare earth to target material ratio is no more than about 1.4, the rare earth to target material ratio is no more than about 1.5, the rare earth to target material ratio is no more than about 1.6, the rare earth to target material ratio is no more than about
  • the rare earth to target material ratio is no more than about 0.1, the rare earth to target material ratio is no more than about 0.2, the rare earth to target material ratio is no more about 0.3, the rare earth to target material ratio is no more than about 0.4, the rare earth to target material ratio is no more than about 0.5, the rare earth to target material ratio is no more than about 0.6, the rare earth to target material ratio is no more than about 0.7, the rare earth to target material ratio is no more than about 0.8, the rare earth to target material ratio is no more than about 0.9, the rare earth to target material ratio is no more than about 1.0, the rare earth to target material ratio is no more than about 1.1, the rare earth to target material ratio is no more than about 1.2, the rare earth to target material ratio is no more than about 1.3, the rare earth to target material ratio is no more than about 1.4, the rare earth to target material ratio is no more than about 1.5, the rare earth to target material ratio is no more than about 1.6, the rare earth to target material ratio is no more than about
  • 0.1 mg target material/g REO e.g. Ce0 2
  • These can have rare earth:target material ratios that are significantly larger than 2.
  • the rare earth to target material ratio is commonly no more than about 50,000, the rare earth to target material ratio is more commonly no more than about 47,500, the rare earth to target material ratio is more commonly no more about 45,000, the rare earth to target material ratio is more commonly no more than about 42,500, the rare earth to target material ratio is more commonly no more than about 40,000, the rare earth to target material ratio is no more than about
  • the rare earth to target material ratio is more commonly no more than about
  • the rare earth to target material ratio is more commonly no more than about
  • the rare earth to target material ratio is more commonly no more than about
  • the rare earth to target material ratio is more commonly no more than about
  • the rare earth to target material ratio is more commonly no more than about
  • the rare earth to target material ratio is more commonly no more than about
  • the rare earth to target material ratio is more commonly no more than about
  • the rare earth to target material ratio is more commonly no more than about
  • the rare earth to target material ratio is more commonly no more than about
  • the rare earth to target material ratio is more commonly no more than about
  • the rare earth to target material ratio is more commonly no more than about
  • the rare earth to target material ratio is more commonly no more about 20,000, at a water pH value of no more than about pH -2, at a water pH value of more than about pH -1 , at a water pH value of more than about pH 0, at a water pH value of more than about pH 1 , at a water pH value of more than about pH 2, at a water pH value of more than about pH 3, at a water pH value of more than about pH 4, at a water pH value of more than about pH 5, at a water pH value of more than about pH 6, at a water pH value of more than about pH 7, at a water pH value of more than about pH 8, at a water pH value of more than about pH 9, at a water pH value of more than about pH 10, at a water pH value of more than about pH 11 , at a water pH value of more than about pH 12, at a water pH value of more than about pH 13, or at a water pH value of more than about pH 14.
  • the concentration of the target material and target material-containing species can vary depending on a number of factors.
  • the concentration of either or both can be, for example, commonly at least about 5 ppm, more commonly at least about 50 ppm, more commonly at least about 100 ppm, more commonly at least about 500 ppm, more commonly at least about 1,000 ppm, more commonly at least about 5,000 ppm, more commonly at least about 10,000 ppm, and more commonly at least about 100,000 ppm.
  • the medium 104 is optionally pre-treated to produce a selected primary species of the target material.
  • the selected primary species is generally more effectively removed by the rare earth-containing composition, additive, and/or particle than the primary species in the medium 104.
  • one or more of the Eh and pH values may be altered for more effective removal and/or detoxification of the target material.
  • the primary species of lead for instance, is elemental (Pb s ) when the Eh is less (more negative) than about -0.3.
  • the primary species of lead can become one or more of Pb(H 2 0)6 2+ , Pb(H 2 0) 5 C0 3 , Pb(H 2 0) 4 (C0 3 ) 2 2+ , Pb(H 2 0) 5 (OH) 2 , or Pb(H 2 0) 2 (OH) 4 2" .
  • pH is a measure of the activity of hydrogen ions while Eh is a measure of the electrochemical (oxidation/reduction) potential.
  • the type of pre-treatment employed can depend on the application.
  • an acid, acid equivalent, base, or base equivalent is added to adjust the pH to a desired pH value.
  • acids or acid equivalents include monoprotic acids and polyprotic acids, such as mineral acids, sulfonic acids, carboxylic acids, vinylogous carboxylic acids, nucleic acids, and mixtures thereof.
  • bases and base equivalents include strong bases (such as potassium hydroxide, barium hydroxide, cesium hydroxide, sodium hydroxide, strontium hydroxide, calcium hydroxide, magnesium hydroxide, lithium hydroxide, and rubidium hydroxide), superbases, carbonates, ammonia, hydroxides, metal oxides (particularly alkoxides), and
  • Eh is a measure of the oxidiation or reduction potential of the medium 104.
  • the oxidation or reduction potential is commonly referred to as electromotive force or EMF.
  • the EMF is typically measured with respect to a standardized reference electrode.
  • standardized reference electrodes are hydrogen electrode (commonly referred to as SHE), copper copper sulfate electrode, and silver/silver chloride to name a few.
  • the target material or target material-containing species is contacted with an oxidizing agent to oxidize the target material or target material- containing species.
  • the oxidizing agent may comprise a chemical oxidizing agent, an oxidation process, or combination of both.
  • a chemical oxidizing agent comprises a chemical composition in elemental or compounded form.
  • the chemical oxidizing agent accepts an electron from the target material or target material-containing species. In the accepting of the electron, the oxidizing agent is reduced to form a reduced form of the oxidizing agent.
  • Non-limiting examples of preferred chemical oxidizing agents are chlorine, chloroamines, chlorine dioxide, hypochlorites, trihalomethane, haloacetic acid, ozone, hydrogen peroxide, peroxygen compounds, hypobromous acid, bromoamines, hypobromite, hypochlorous acid, isocyanurates, tricholoro-s-triazinetriones, hydantoins, bromochloro- dimethyldantoins, l-bromo-3-chloro-5,5-dimethyldantoin, l,3-dichloro-5,5- dimethyldantoin, sulfur dioxide, bisulfates, and combinations thereof.
  • one or more the following chemical compositions may oxidize the target material or target material-containing species: bromine, BrCl, permanganates, phenols, alcohols, oxyanions, arsenites, chromates, trichloroisocyanuric acid, and surfactants.
  • the chemical oxidizing agent may further be referred to as an "oxidant” or an "oxidizer”.
  • An oxidation process comprises a physical process that alone or in combination with a chemical oxidizing agent.
  • the oxidation process removes and/or facilitates the removal an electron from the target material or target material-containing species.
  • Non- limiting examples of oxidation processes are electromagnetic energy, ultra violet light, thermal energy, ultrasonic energy, and gamma rays.
  • the target material or target material-containing species is contacted with a reducing agent to reduce the target material or target material-containing species.
  • the oxidizing agent may comprise a chemical oxidizing agent, an oxidation process, or combination of both.
  • a chemical reducing agent comprises a chemical composition in elemental or compounded form.
  • the chemical reducing agent donates an electron to the target material or target material-containing species. In the donating the electron, the reducing agent is oxidized to form an oxidized form of the oxidizing agent.
  • Non-limiting examples of preferred chemical reducing agents are lithium aluminum hydride, nascent (atomic) hydrogen, sodium amalgam, sodium borohydride, compounds containing divalent tin ion, sulfite compounds, hydrazine, zinc-mercury amalgam, diisobutylaluminum hydride, Lindlar catalyst, oxalic acid, formic acid, ascorbic acid, phosphites, hypophosphites, phosphorous acids, dithiothreitols, and compounds containing the divalent iron ion.
  • the chemical reducing agent may further be referred to as a "reductant" or a "reducer”.
  • a redox process is a physical process that alone or in combination with a chemical oxidizing agent transfers electrons to or form a target material or target material- containing species.
  • oxidation processes are electromagnetic energy, ultra violet light, thermal energy, ultrasonic energy, gamma rays, and biological processes.
  • the medium is contacted with a halogenated species, such as chlorine, bromine, iodine, or an acid, base, or salt thereof.
  • a halogenated species such as chlorine, bromine, iodine, or an acid, base, or salt thereof.
  • halogens impact the Eh of the medium.
  • halogens can impact the pH value of the aqueous media.
  • pre-treatment may be employed to remove species from the medium that can impair removal of the target material or target material-containing species and/or adjustment of the pH and/or Eh of the medium.
  • the pre-treatment can comprise one or more of clarifying, disinfecting,
  • the pre-treatment process can commonly comprise one of clarifying, disinfecting, coagulating, aerating, filtering, separating solids and liquids, digesting, and polishing processes, more commonly any two of clarifying, disinfecting, coagulating, aerating, filtering, separating solids and liquids, digesting, and polishing processes arranged in any order, even more commonly any three of clarifying,
  • the optionally pre-treated medium is contacted with the rare earth- containing composition, additive, or particle or particulate to form a rare earth- and target material-containing product.
  • the rare earth-containingcomposition, additive, and/or particle or particulate chemically and/or physically reacts with, sorbs, precipitates, chemically transforms, or otherwise deactivates or binds with the target material or target material-containing species.
  • the rare earth-containing additive reacts with, sorbs, precipitates, chemically transforms, or otherwise deactivates or binds with at least about 25%, more commonly at least about 50%, more commonly more commonly more than about 50%, more commonly at least about 75%, and even more commonly at least about 95% of the target material or target material-containing species.
  • the rare earth- and target material-containing product includes the rare earth, the target material, and, depending on the materials involved, potentially one or more other constituents or components of the rare earth-containing composition and/or target material-containing species.
  • the binding mechanism in some processes, is by waters of hydration, hydroxyl radical, hydroxide ion, or carbonate species, compounded, complexed, or otherwise attached to the target material acts as a chemical entity that attaches, sorbs and/or chemically bonds to the rare earth or rare earth-containing composition.
  • the temperature of the medium 104, during the contacting step, can vary.
  • the temperature of the aqueous solution can vary during the contacting step.
  • the temperature of the aqueous solution can vary depending on the water.
  • the temperature of the aqueous solution is ambient temperature.
  • the solution temperature ranges from about -5 degrees Celsius to about 50 degrees Celsius, more typically from about 0 degrees Celsius to about 45 degrees Celsius, yet even more typically from about 5 degrees Celsius to about 40 degrees Celsius and still yet even more typically from about 10 degrees Celsius to about 35 degrees Celsius.
  • each of the waters comprising each of the clarifying, disinfecting, coagulating, aerating, filtering, separating solids and liquids, digesting, and polishing processes may include optional processing units and/or operations that heat and/or cool one or more of each of the waters.
  • each of the waters may be heated to have a temperature of typically at least about 20 degrees Celsius, more typically at least about 25 degrees Celsius, even more typically at least about 30 degrees Celsius, yet even more typically of at least about 35 degrees Celsius, still yet even more typically of at least about 40 degrees Celsius, still yet even more typically of at least about 45 degrees Celsius, still yet even more typically of at least about 50 degrees Celsius, still yet even more typically of at least about 60 degrees Celsius, still yet even more typically of at least about 70 degrees Celsius, still yet even more typically of at least about 80 degrees Celsius, still yet even more typically of at least about 90 degrees Celsius, still yet even more typically of at least about 100 degrees Celsius, still yet even more typically of at least about 110 degrees Celsius, still yet even more typically of at least about 120 degrees Celsius, still yet even more typically of at least about 140 degrees Celsius, still yet even more typically of at least about 150 degrees Celsius, or still yet even more typically of at least about 200 degrees Celsius.
  • each of the waters comprising each of the clarifying, disinfecting, coagulating, aerating, filtering, separating solids and liquids, digesting, and polishing processes may be cooled to have a temperature of typically of no more than about 110 degrees Celsius, more typically of no more than about 100 degrees Celsius, even more typically of no more than about 90 degrees Celsius, yet even more typically of no more than about 80 degrees Celsius, still yet even more typically of no more than about 70 degrees Celsius, still yet even more typically of no more than about 60 degrees Celsius, still yet even more typically of no more than about 50 degrees Celsius, still yet even more typically of no more than about 45 degrees Celsius, still yet even more typically of no more than about 40 degrees Celsius, still yet even more typically of no more than about 35 degrees Celsius, still yet even more typically of no more than about 30 degrees Celsius, still yet even more typically of no more than about 25 degrees Celsius, still yet even more typically of no more than about 20 degrees Celsius, still yet even more typically of no more than about 15 degrees Celsius, still yet even more typically of no more than about 10 degrees
  • the product is removed from the medium 104 to form a treated medium 124.
  • a treated medium 124 commonly at least about 25%, more commonly at least about 50%, more commonly more commonly more than about 50%, more commonly at least about 75%, and even more commonly at least about 95% of the rare earth- and target material-containing product is removed from the medium. It can be appreciated that, in such instances, the product comprises an insoluble material.
  • the solid rare earth- and target material-containing product may be removed by any suitable technique, such as by a liquid/solid separation system.
  • suitable technique such as by a liquid/solid separation system.
  • liquid/solid separation systems are filtration, floatation, sedimentation, cyclone, and centrifuging.
  • the rare earth-containing additive is in the form of a particulate bed or supported porous and permeable matrix, such as a filter, through which the media passes.
  • the rare earth- and target material-containing product dissolved in the water may remain in the water in a de-activated form.
  • deactivated rare earth- and target material-containing product that may remain dissolved are environmentally stable co-ordination complexes of a target material-containing species and the rare earth-containing composition.
  • the treated medium 124 has a lower content of at least one target material compared to the target material-containing medium 104.
  • the treated medium 124 content is at least about 0.9 of the medium target material-containing medium 104, more commonly the treated medium 124 content is at least about 0.8 of the medium target material-containing medium 104, even more commonly the treated medium 124 content is at least about 0.7 of the target material- containing medium 104, yet even more commonly the treated medium 124 content is at least about 0.6 of the target material-containing medium 104, still yet even more commonly the treated medium 124 content is at least about 0.5 of the target material- containing medium 104, still yet even more commonly the treated medium 124 content is at least about 0.4 of the target material-containing medium 104, still yet even more commonly the treated medium 124 content is at least about 0.3 of the target material- containing medium 104, still yet even more commonly the treated medium 124 content is at least about 0.2 of the target material-containing medium 104, still yet even more commonly the treated medium 124 content is at least
  • the target material content in the treated medium 124 content is no more than about 100,000 ppm, more typically the target material content in the treated medium 124 content is no more than about 10,000 ppm, even more typically the target material content in the treated medium 124 content is no more than about 1,000 ppm, yet even more typically the target material content in the treated medium 124 content is no more than about 100 ppm, still yet even more typically the target material content in the treated medium 124 content is no more than about 10 ppm, still yet even more typically the target material content in the treated medium 124 content is no more than about 1 ppm, still yet even more typically the target material content in the treated medium 124 content is no more than about 100 ppb, still yet even more typically the target material content in the treated medium 124 content is no more than about 10 ppb, still yet even more typically the target material content in the treated medium 124 content is no more than about 1 ppb, and yet still even more typically the target material content in the treated medium 124 content is no more than about 0.1 ppb.
  • Step 116 can include optional treatment steps.
  • the treatment can comprise one or more of clarifying, disinfecting, coagulating, aeratmg, filtering, separating solids and liquids, digesting, and polishing processes. More specifically, the treatment process can commonly comprise one of clarifying, disinfecting, coagulating, aerating, filtering, separating solids and liquids, digesting, and polishing, more commonly any two of clarifying, disinfecting, coagulating, aerating, filtering, separating solids and liquids, digesting, and polishing arranged in any order, even more commonly any three of clarifying, disinfecting, coagulating, aerating, filtering, separating solids and liquids, digesting, and polishing arranged in any order, yet even more commonly any four of clarifying, disinfecting, coagulating, aerating, filtering, separating solids and liquids, digesting, and polishing arranged in any order, still yet even more commonly any five of clarifying, disinfecting, coagulating, aerating, filtering, separating solids and liquids,
  • the separated rare earth- and target material-containing product may be subjected to suitable processes for removal of the target material from the rare earth to enable the rare earth to be recycled to step 112.
  • Regeneration processes include, for example, desorbtion, oxidation, reduction, thermal processes, irradiation, and the like.
  • cerium (III) may refer to cerium (+3), and cerium (+3) may refer to cerium (III).
  • cerium (IV) may refer to cerium (+4), and cerium (+4) may refer to cerium (IV).
  • arsenic-containing streams hereinafter alkaline leach solutions
  • the initial pH of the seven alkaline leach solutions was approximately pH 11 , the temperatures of the solutions were approximately 70 to 80°C, and the reaction times were approximately 30 minutes.
  • a first step 200 mL of solution were measured out by weight and transferred into a 400 mL Pyrex beaker. The beaker was then placed on hot/stir plate and heated to 70-80°C while being stirred.
  • step three In a second step, 3.44 mL of cerium chloride were measured out, by weight, and poured into the mixing beaker of hot alkaline leach solution. Upon the addition of cerium chloride, a white precipitate formed instantaneously. To ensure that the white precipitate was not cerium carbonate [Ce2(CC"3)3 ⁇ XH2O], step three was performed.
  • Fig. 48 shows that the loading capacity begins to level off at the theoretical capacity of 436 mg/g if cerium arsenate (CeAsC ⁇ ) was formed, leading one to believe it was formed.
  • Fig. 49 displays that the molar ratio of cerium to arsenic required to bring down the arsenic concentration to less than 50 ppm lies somewhere between a 1 molar and 2 molar ratio. However, at a 2 molar ratio a loading capacity of 217 was achieved.
  • Fig. 50 shows very similar results (essentially double the addition of CeCl 3 ); at a molar ratio between 1 and 2, the dissolved arsenic concentration can be below 50 ppm. This capacity may be improved with a lower molar ratio and tighter pH control.
  • the product of cerium and arsenic was shown to contain more arsenic than would be anticipated based upon the stoichiometry of gasparite, the anticipated product of cerium and arsenic. Furthermore, the X-ray diffraction pattern suggests that the product is amorphous or nanocrystalline and is consistent with ceria or, possibly, gasparite. The amorphous or nanocrystalline phase not only permits the recycling of process water after arsenic sequestration but does so with a far greater arsenic removal capacity than is observed from other forms of cerium addition, decreasing treatment costs and limiting environmental hazards.
  • the supernatant solutions were collected and the volume recorded.
  • the filter cake from the reaction was left over the weekend in plastic weight boats atop a drying oven. Seventy-two hours later, the content of each boat was weighed, and it was determined that the pellets were still very moist (more mass present than was added to the sample as dissolved solids).
  • the semi-dry solids of the samples with 2 mL of cerium salt solution were transferred to a 130°C drying oven for one hour, then analyzed by XRD.
  • Fig. 51 The XRD results are shown in Fig. 51. XRD results are presented for gasparite (the expected product) and the various systems that were present during the experiments, with "ceria" corresponding to cerium dioxide. As can be seen from Fig. 51, the XRD analysis did not detect any crystalline peaks or phases of arsenic and cerium solids in the various systems. The only crystalline material present was identified as either NaCl, NaNC"3 (introduced with the rare earth solutions) or Na2SC"4 that was present in the samples prepared from Na2SC"4. However, the broad diffraction peaks at about 29, 49, and 57 degrees 2-Theta could be indicative of very small particles of ceria or, possibly, gasparite.
  • Fig. 52 shows a plot for arsenic micromoles removed in an "oxidized” system staring with arsenate and a "molecular oxygen sparged" system starting with arsenite, which was subsequently oxidized to arsenate through molecular oxygen sparging.
  • Fig. 52 shows the amount of arsenic consumed by the formation of precipitated solids, plotted as a function of the amount of cerium added.
  • the resultant soluble arsenic concentrations from this experiment can be divided into two groups: samples containing fully oxidized arsenate and sulfate and samples containing arsenite and sulfite that was sparged with molecular oxygen.
  • the oxidation state of the cerium used as the soluble fixing agent had considerably less impact on the efficacy of the process, allowing both Ce(III) and Ce(IV) data to be fit with a single regression line for each test solution.
  • arsenic sequestration with the solids increases in an arsenic to cerium molar ratio of 1 :3, potentially making a product with a stoichiometry of Ce3As4.
  • a simulated waste stream solution was prepared with the following components: As (1,200 ppm), F (650 ppm), Fe (120 ppm), S (80 ppm), Si (50 ppm), Ca (35 ppm), Mg (25 ppm), Zn (10 ppm), and less than 10 ppm of Al, K, and Cu.
  • the pH of the solution was titrated down to pH 0.4 with concentrated HC1 (12.1 mol/L), and the solution was heated to 70°C.
  • a solution of CeCl 3 (6.3 mL, 1.194 mol/L) was added to the hot solution, and the pH was slowly increased to pH 7.5 by dropwise addition of NaOH (20 wt. %, 6.2 mol/L).
  • the solution was then allowed to age at 70°C under magnetic stirring for 1.5 hours, holding pH at pH 7.5 ⁇ 0.2. The solution was then removed from the heat and allowed to settle undisturbed for 12 to 18 hours. The supernatant was decanted off and saved for ICP-MS analysis of Ce and As.
  • the precipitated solids were centrifuged and washed twice before being filtered through a 0.4 ⁇ cellulose membrane and washed thoroughly with 500 to 800 mL of de-ionized water. The solids were air-dried and analyzed by X-ray diffraction.
  • Fig. 53 compares the X-Ray Diffraction ("XRD") results for the novel Ce-As compound (shown as trigonal CeAs 0 4 ⁇ (H 2 0) x (both experimental and simulated) and gasparite (both experimental and simulated).
  • Fig. 9 compares the XRD results for trigonal CeAs 0 4 ⁇ (H 2 0) x (both experimental and simulated) and trigonal BiP 0 4 ⁇ (H 2 O) 0 67 (simulated).
  • Solutions containing only arsenic and cerium show that a Ce:As atomic ratio of 1 : 1 is preferable for forming the novel compound, and solutions containing excess cerium have produced a cerium oxide (Ce0 2 ) precipitate in addition to the novel compound. Additionally, the novel compound appears to be quite stable when challenged with a leach test requiring less than 1 ppm arsenic dissolution in solution of pH 2.9 and pH 5.0.
  • a test solution containing 1.0 ppmw chromium calculated as Cr was prepared by dissolving reagent grade potassium dichromate in distilled water. This solution contained Cr 6 in the form of oxyanions and no other metal oxyanions.
  • a mixture of 0.5 gram of lanthanum oxide (La 2 C>3) and 0.5 gram of cerium dioxide (Ce0 2 ) was slurried with 100 milliliters of the test solution in a glass container. The resultant slurries were agitated with a Teflon coated magnetic stir bar for 15 minutes. After agitation the water was separated from the solids by filtration through Whatman #41 filter paper and analyzed for chromium using an inductively coupled plasma atomic emission
  • the lanthanum oxide, the cerium dioxide and the equal mixture of each were effective in removing over 98 percent of the chromium from the test solution.
  • Tests 1-3 were repeated except that a test solution containing 1.0 ppmw antimony calculated as Sb was used instead of the chromium test solution.
  • the antimony test solution was prepared by diluting with distilled water a certified standard solution containing 100 ppmw antimony along with 100 ppmw each of As, Be, Ca, Cd, Co, Cr, Fe, Li, Mg, Mn, Mo, Ni, Pb, Se, Sr, Ti, Tl, V, and Zn.
  • the results of these tests are also set forth in Table 4 and show that the two rare earth compounds alone or in admixture were effective in removing 90 percent or more of the antimony from the test solution.
  • Tests 1-3 were repeated except that a test solution containing 1.0 ppmw molybdenum calculated as Mo was used instead of the chromium test solution.
  • the molybdenum test solution was prepared by diluting with distilled water a certified standard solution containing 100 ppmw molybdenum along with 100 ppmw each of As, Be, Ca, Cd, Co, Cr, Fe, Li, Mg, Mn, Ni, Pb, Sb, Se, Sr, Ti, Tl, V, and Zn.
  • the results of these tests are set forth in Table 4 and show that the lanthanum oxide, the cerium dioxide and the equal weight mixture of each were effective in removing over 99 percent of the molybdenum from the test solution.
  • test solution containing 1.0 ppmw vanadium calculated as V was used instead of the chromium test solution.
  • the vanadium test solution was prepared by diluting with distilled water a certified standard solution containing 100 ppmw vanadium along with 100 ppmw each of As, Be, Ca, Cd, Co, Cr, Fe, Li, Mg, Mn, Mo, Ni, Pb, Sb, Se, Sr, Ti, Tl, and Zn.
  • Tests 1-3 were repeated except that a test solution containing 2.0 ppmw uranium calculated as U was used instead of the chromium test solution.
  • the uranium test solution was prepared by diluting a certified standard solution containing 1,000 ppmw uranium with distilled water. This solution contained no other metals.
  • Table 4 The results of these tests are set forth in Table 4 and show that, like in Tests 10-12, the lanthanum oxide and the equal weight mixture of lanthanum oxide and cerium dioxide were effective in removing the vast majority of the uranium from the test solution.
  • the cerium dioxide was not as effective removing about 75 percent of the uranium.
  • Tests 1-3 were repeated except that a test solution containing 1.0 ppmw tungsten calculated as W was used instead of the chromium test solution.
  • the tungsten test solution was prepared by diluting a certified standard solution containing 1,000 ppmw tungsten with distilled water. The solution contained no other metals.
  • Table 4 The results of these tests are set forth in Table 4 and show that the lanthanum oxide, cerium dioxide, and the equal weight mixture of lanthanum oxide and cerium dioxide were equally effective in removing 95 percent or more of the tungsten from the test solution.
  • Example 5 Example 5
  • the initial pH of the stock solution was pH approximately 0-1.
  • the temperature of the stock solution was elevated to 70° C.
  • the reaction or residence time was
  • Step 1
  • Enough cerium chloride was added to the stock solution to meet a predetermined molar ratio of cerium to arsenic. For example, to achieve a molar ratio of one ceria mole to one mole of arsenic 5.68 mL of cerium chloride was measure gravimetrically (7.17g) and added to the stirring solution. Upon addition of cerium chloride a yellow/white precipitate formed instantaneously, and the pH dropped due to the normality of the cerium chloride solution being 0.22. The pH was adjusted to approximately 7 using 20% sodium hydroxide.
  • a comparison of loading capacities for solutions containing or lacking fluoride shows a strong affinity for halogens and halogenated compounds.
  • Figure 55 shows the affinity of cerium III for fluoride in the presence of arsenic.
  • Figure 56 shows that the loading capacities (which is defined as mg of As per gram of Ce0 2 ) for solutions lacking fluoride are considerably higher at low molar ratios of cerium to arsenic. Sequestration of fluorinated organic compounds, particularly fluorinated pharmaceutical compounds, using rare earth metals, and particularly cerium, is clearly indicated.
  • This example demonstrates the successful removal of sulfate-containing compounds, halogenated compounds, carbonate-containing compounds, and phosphate- containing compounds, using a cerium dioxide powder.
  • a cerium powder having a 400 ppb arsenic removal capacity, was contacted with various solutions containing arsenic (III) as arsenite and arsenic (V) as arsenate and elevated concentrations of the compounds that compete for the known binding affinity between arsenic and cerium.
  • the competing organic compounds included sulfate ions, fluoride ions, chloride ions, carbonate ions, silicate ions, and phosphate ions at concentrations of approximately 500% of the corresponding NSF concentration for the ion.
  • the cerium dioxide powder was further contacted with arsenic-contaminated distilled and NSF P231 "general test water 2" (“NSF”) water. Distilled water provided the baseline measurement.
  • Fig. 55 The results are presented in Fig. 55.
  • the ions in NSF water caused, relative to distilled water, a decreased cerium dioxide capacity for both arsenite and arsenate, indicating a successful binding of these compounds to the rare earth metal.
  • the presence of carbonate ion decreased the cerium dioxide removal capacity for arsenate more than arsenite.
  • the presence of silicate ion decreased substantially cerium dioxide removal capacities for both arsenite and arsenate.
  • phosphate ion caused the largest decrease in cerium dioxide removal capacities for arsenite (10X NSF concentration) and arsenate (50X NSF concentration), with the largest decrease in removal capacity being for arsenite.
  • the ceria was contacted with permanganate for 18 hours then filtered to retain solids.
  • the filtrate solutions were analyzed for Mn using ICP-AES, and the solids were washed with 250 mL of DI water. The non-pH adjusted solids were washed a second time.
  • Phosphate was far more effective at inducing permanganate desorption than it was at inducing arsenate desorption. Phosphate was the most effective desorption promoter we examined with permanganate. In other words, the ability of the ceria powder to remove permanaganate in the presence of phosphate appears to be relatively low as the capacity of the ceria powder for phosphate is much higher than for permanganate.
  • Oxalic acid caused a significant color change in the permanganate solution, indicating that the Mn(VII) was reduced, possibly to Mn(II) or Mn(IV), wherein the formation of MnO or Mn0 2 precipitates would prevent the detection of additional Mn that may or may not be removed from the ceria.
  • a reductant appears therefore to be an interferer to ceria removal of Mn(VII).
  • no desorbed Mn was detected.
  • a significant amount of Mn was recovered from the ceria surface.
  • Ceria capacity for chromate was significant and a loading of > 20 mg Cr / g ceria was achieved without any adjustments to pH or system optimization (pH of filtrate was approximately 8). Likewise, the extraction of adsorbed chromate was also readily accomplished. Raising the pH of the slurry containing chromate-laden ceria using 1 N NaOH was the most effective method of desorbing chromium that was tested.
  • antimony (III) oxide was placed into 1 L of distilled water with 10 mL concentrated HC1, allowed several days to equilibrate, and was filtered through a 0.8 micron polycarbonate membrane to remove undissolved antimony.
  • the liter of antimony solution was contacted with 16 g of ceria powder, which was effective removing antimony from solution, but had too little Sb(III) available to generate a high loading on the surface.
  • the extraction tests revealed little Sb recovery. Even the use of hydrogen peroxide, which would be expected to convert Sb(III) to a less readily adsorbed species of Sb(V), did not result in significant amounts of Sb recovery.
  • Tables 8-11 show the test parameters and results.
  • Table 8 Loading of cerium oxide surface with arsenate and arsenite for the demonstration of arsenic desorbing technologies.
  • Table 9 Loading of cerium oxide surface with arsenate and arsenite for the demonstration of arsenic desorbing technologies.
  • Table 1 1 Loading and extraction of other adsorbed elements from the ceria surface
  • Struvite particles comprising NH 4 MgP0 4 '6H 2 0 were mixed in CeCl 3 solutions having different molar ratios of CeCl 3 to NH 4 MgP0 4 -6H 2 0 of about 0.8, 1.0, 1.2 and 1.5 CeCl 3 to NH 4 MgP0 4 '6H 2 0.
  • the mass of the struvite was about 0.2g
  • the concentration of CeCl 3 was about 0.5 mole/L.
  • controls of about 0.2 grams of struvite in about 0.1L de-ionized water were prepared. The pH value of each solution was adjusted to a pH of about pH 4.3 ⁇ 0.2. Magnetic stir-bars were used to stir each sample solution.
  • Struvite, NH 4 MgP0 -6H 2 0, particles were mixed in about 0.1 L solutions containing different rare earth chlorides.
  • the rare earth chloride solutions were about 0.15 mol/L solutions of LaCl 3 , CeCl 3 , PrCl 3 and NdCl 3 .
  • the mass of struvite added to each rare earth chloride solution was about 0.2 g and the molar ratio of the rare earth chloride to struvite was about 1.0.
  • the pH of rare earth chloride solution was adjusted to a pH of about pH 4.3 ⁇ 0.2. Magnetic stir-bars were used to stir each sample solution. After stirring for at least about 16 hours, the solids were filtered from the solution. The filtered solids were analyzed by x-ray diffraction and the solutions were analyzed by ICP-MS. Final solution pH values ranged from about pH 4.6 to about pH 8.0. The results are summarized in Table 13.
  • Example 11 is a control having about 0.2 g of struvite, NFLiMgPC eFkO, particles mixed in about 0.1L of a 0.15 mol/L acidic ferric chloride, FeCl 3 , solution.
  • the molar ratio of ferric chloride to struvite was about 1.0 and the initial pH of the solution was about pH 2.5.
  • the initial pH of the control solution was low enough to dissolve the struvite without the presence of ferric chloride.
  • a magnetic stir-bar was used to stir the control solution. After stirring for at least about 16 hours, the solids were filtered from the control solution. The filtered solids were analyzed by x-ray diffraction and the control solution was analyzed by ICP-MS. Final solution pH value was about pH 2.3. The results are summarized in Table 14.
  • Example 9-11 show that struvite can be more effectively removed with rare earth-containing compositions than with other removal materials such as ferric chloride.
  • Example 12
  • Table 15 summarizes deposit material removal capacities from deinoized and NSF waters for cerium dioxide.
  • Nitrate _ 0.00
  • a cerium-containing composition is effective in removing species comprising the target materials of Table 16.
  • a cerium-containing composition is effective in removing species comprising the target materials of Table 17.
  • CeC"2 is in the form of a powder and agglomerated Ce02 is agglomerated with a polymeric binder.
  • Insoluble forms of lead may be removed from an aqueous media containing one or both of soluble and insoluble forms of lead by the rare-earth containing composition.
  • the insoluble lead may be in the form of colloidal and/or particulate lead, such as, but not limited to a lead oxide, lead hydroxide, and/or lead oxy(hydroxyl).
  • the insoluble lead composition may be in a hydrated form having one or more waters of hydration.
  • NSF testing water composition in defined in one or more of the following documents: "NSF/ANSI 42-2007a NSF International Standard/ American National Standard for Drinking Water Treatment Units - Drinking Water Treatment Units - Aesthetic Effects" Standard Developer - NSF International, Designated as a ANSI Standard, October 22, 2007, American National Standards; "NSF/ANSI 53-2009e NSF International Standard/ American National Standard Drinking Water Treatment Units - Health Effects” Standard Developer - NSF International, designated as an ANSI Standard, August 28, 2009; and "NSF/ANSI 61 -2009 NSF International Standard/ American
  • HAS High surface area
  • the analyte had a pH of pH 12.25 ⁇ 0.25, a temperature of 20-25°C (or ambient room temperature.
  • the analyte was contacted with the HSF ceria for approximately 24 hours.
  • the reagents in question were bismuth, chromium, cobalt, manganese, zinc and zirconium species. Under the above conditions, the primary species were believed to be in colloidal form.
  • the media were prepared by measuring 20 mg of HSA ceria in a plastic weigh boat and wetting the HAS ceria media with deionized water for at least 30 minutes.
  • the analyte was prepared in 2.0 L batches in NSF 53. Lead removal water without added lead. 1,000 mg/L SPEX nitric based standards were obtained and were used to prepare 0.5 mg/L influents of the reagents in question. This solution was mixed with a high shear blender (Ninja Model: BL500 30) for 30 seconds. The pH adjusted to pH 12.25 ⁇ 0.25 with 3M NaOH and mixed for an additional 60 seconds. Previous test with higher concentrations showed that at a pH of 12.25 ⁇ 0.25 particulates were present.
  • the isotherm was prepared by pouring 500 mL of influent into 4 500 mL bottles. The previously wetted media were poured into each 500 mL sample bottle. Bottles were capped and sealed with electrical tape. Each bottle was then placed within a rolling container that could hold up to 10 bottles. The containers were sealed with duct tape and placed on the rolling apparatus. Samples and controls were rolled for 24 hours. After 24 hours, the rolling containers were removed from the apparatus and the bottles were retrieved from the containers.
  • ICP-MS Inductively Coupled Plasma-Mass Spectrometry
  • colloidal bismuth, chromium, manganese, and zinc were all removed from NSF 53 water with HSA Ceria.
  • the ability to remove the reagent in question was based on at least a 10% removal of the reagent in question from the influent.
  • This table 22 shows the breakdown of cobalt and zirconium.
  • Flowrate Flow rates ranged from 1 to 1.8 mL/min, or 2.2%-4.0% Bed Volume Approximate Amount of Flocculent Used: 22 drops of 1% Nalco 7871
  • the flocculated Ce0 2 media are transferred into a 2.54 cm by 30 cm glass column. DI water is flown through the bed at 12 mL/min to settle the bed until it completely settled down to 8.5 cm. The DI water on top of the bed was decanted and replaced with the influent solution then capped and tightly sealed.
  • the arsenic species loading capacity of cerium (IV) oxide loading is affected by changes in temperature, surface area, speciation, and arsenic species concentration.
  • HSA high surface area
  • IV cerium oxide
  • HSA ceria oxide (Surface area: 130 ⁇ 10 m 2 /g)
  • Influent was prepared in 2.0 L batches in NSF 53 Lead removal water without added Lead. 1000 mg/L SPEX nitric based standards were obtained and were used to prepare 0.5 mg/L influents of the reagents in question. This solution was first mixed with a high shear blender (Ninja Model: BL500 30) for 30 seconds, then pH adjusted with 3M NaOH or cone. HC1, the solution was then mixed for an additional 30 seconds. Oxidation- Reduction-Potential ("ORP") values were then adjusted using solid Sodium Sulfite or 12.5% NaCIO solution (see Table 25).
  • ORP Oxidation- Reduction-Potential
  • Sample Prep Procedure for Analysis For each metal sample, a 5 mL sample was taken and diluted with the addition of 5 mL 10% Nitric acid and then filtered with a 0.2 ⁇ filter. The samples were acidified to ensure that all metals were in soluble form. Metal samples were analyzed by Inductively Coupled Plasma-Mass Spectrometry (ICP-MS). To confirm the presence of insoluble metals, samples were first filtered with a 0.2 ⁇ filter to remove any insoluble metals then acidified to ensure all samples were the same. All isotherms were prepared and tested in the same manner and were thus readily comparable.
  • ICP-MS Inductively Coupled Plasma-Mass Spectrometry
  • HSA ceria Colloidal chromium, aluminum, and copper were all removed from NSF 53 water with HSA ceria. Some experiments indicated that cobalt, zinc, and zirconium were also removed. The ability of HAS ceria to remove manganese was unclear.
  • HSA high surface area
  • IV cerium oxide
  • Metals Tested Bismuth, Chromium, Cobalt, Manganese, Zinc, Zirconium, Aluminum, and Copper.
  • Influent was prepared in 2.0 L batches in NSF 53 Lead removal water without added Lead. 1000 mg/L SPEX nitric based standards were obtained and were used to prepare 0.5 mg/L influents of the reagents in question. This solution was first mixed with a high shear blender (Ninja Model: BL500 30) for 30 seconds, then pH adjusted with 3M NaOH or cone. HCl, the solution was then mixed for an additional 30 seconds. ORP values were then adjusted using solid Sodium Sulfite or 12.5% NaCIO solution.
  • Figures 58-65 show prior art Pourbaix diagrams for the above materials.
  • This example determined whether selected soluble metals can be removed by HAS cerium (IV) oxide from NSF 53 water.
  • Influent was prepared in 2.0 L batches in NSF 53 Lead removal water without added arsenic. 1000 mg/L SPEX nitric based standards were obtained and used to prepare 0.5 mg/L influents of the reagents in question. This solution was mixed using a stir plate, then pH adjusted with 3M NaOH or 3M HCl. ORP values were then adjusted using solid Sodium Sulfite or 12.5% NaCIO solution. Table: 32
  • Figures 3A-E (aluminum), 6A-E (chromium), 7A-F (manganese), 8A-F (iron), 9A- E (cobalt), 10A-E (nickel), 11A-E (copper), 24A-C (cadmium), 66A-E (barium), and 67A- E (radium) are prior art Pourbaix Diagrams for the above metals.
  • the present disclosure in various embodiments, configurations, or aspects, includes components, methods, processes, systems and/or apparatus substantially as depicted and described herein, including various embodiments, configurations, aspects, sub-combinations, and subsets thereof. Those of skill in the art will understand how to make and use the various embodiments, configurations, or aspects after understanding the present disclosure.
  • the present disclosure in various embodiments, configurations, and aspects, includes providing devices and processes in the absence of items not depicted and/or described herein or in various embodiments, configurations, or aspects hereof, including in the absence of such items as may have been used in previous devices or processes, e.g., for improving performance, achieving ease and ⁇ or reducing cost of implementation.

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  • Chemical & Material Sciences (AREA)
  • Water Supply & Treatment (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Removal Of Specific Substances (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
  • Inorganic Compounds Of Heavy Metals (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Water Treatment By Sorption (AREA)

Abstract

L'invention concerne de manière générale des procédés et des additifs à teneur en terres rares qui éliminent des matières cibles se présentant sous la forme d'hydroxydes, de carbonates, d'hydrates ou d'oxyhydroxyles à partir d'un milieu liquide, typiquement aqueux.
EP12771706.4A 2011-04-13 2012-03-28 Elimination par terres rares d'espèces hydratées et hydroxylées Withdrawn EP2697174A4 (fr)

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US201161474902P 2011-04-13 2011-04-13
US201161475155P 2011-04-13 2011-04-13
US201161476667P 2011-04-18 2011-04-18
US201161484919P 2011-05-11 2011-05-11
US201161495731P 2011-06-10 2011-06-10
US201161496425P 2011-06-13 2011-06-13
US201161538634P 2011-09-23 2011-09-23
US13/244,092 US20120074071A1 (en) 2010-09-23 2011-09-23 Process for treating waters and water handling systems to remove scales and reduce the scaling tendency
US13/244,117 US20120103909A1 (en) 2010-09-23 2011-09-23 Particulate cerium dioxide and an in situ method for making and using the same
US201161539780P 2011-09-27 2011-09-27
US201161546803P 2011-10-13 2011-10-13
US201161553809P 2011-10-31 2011-10-31
US201161558887P 2011-11-11 2011-11-11
US201161564132P 2011-11-28 2011-11-28
US13/356,581 US20120187047A1 (en) 2011-01-21 2012-01-23 Rare earth removal of hydrated and hydroxyl species
US13/356,574 US20120187337A1 (en) 2011-01-21 2012-01-23 Rare earth removal of phosphorus-containing materials
US201261596851P 2012-02-09 2012-02-09
US13/410,081 US20120223022A1 (en) 2011-03-01 2012-03-01 Contaminant removal from waters using rare earths
US201261613857P 2012-03-21 2012-03-21
US201261613883P 2012-03-21 2012-03-21
US201261614418P 2012-03-22 2012-03-22
US201261614427P 2012-03-22 2012-03-22
US13/432,895 US20120261611A1 (en) 2011-04-13 2012-03-28 Rare earth removal of phosphorus-containing materials
US13/433,097 US20180251383A9 (en) 2010-04-13 2012-03-28 Non-metal-containing oxyanion removal from waters using rare earths
PCT/US2012/030976 WO2012141896A1 (fr) 2011-04-13 2012-03-28 Elimination par terres rares d'espèces hydratées et hydroxylées

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AU2012243138B2 (en) 2016-02-04
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