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MINERALS HAVING MODIFIED SURFACE PROPERTIES

20190077964 ยท 2019-03-14

    Inventors

    Cpc classification

    International classification

    Abstract

    Materials comprising minerals having modified surface properties, related methods, and their use in products. Materials for use in products may comprise a mineral and a carbonate, such as a precipitated calcium carbonate. Decorating the mineral with the precipitated calcium carbonate may modify a surface property of the mineral, such as, for example, absorptivity, reactivity, or fluorescence.

    Claims

    1. A material comprising a mineral decorated with a fluorescent precipitated alkaline earth metal carbonate.

    2. The material of claim 1, wherein the mineral comprises one or more of the mineral comprises one or more of hematite, diatomaceous earth, aluminosilicate, feldspar, palygorskite, nepheline syenite, silica, attapulgite clay, talc, an alkali earth metal carbonate, kaolin, bentonite, calcium carbonate, barium carbonate, and magnesium carbonate.

    3. The material of claim 2, wherein the calcium carbonate comprises one or more of precipitated calcium carbonate, ground calcium carbonate, dolomite, limestone, chalk, and marble.

    4. The material of claim 1, wherein the mineral is encapsulated by calcium carbonate.

    5. The material of claim 1, wherein the material further comprises a metal element.

    6. The material of claim 5, wherein the metal element comprises one or more of Eu, Y, Sm, La, Ce, Pr, Nd, Pm, Gd, Tb, Dy, Ho, Er, Tm, Yb, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Ag, Cd, Lu, Hf, Ta, W, Re, Os, Ir, Pt, Au, and Hg.

    7. The material of claim 1, wherein the fluorescent precipitated alkaline earth metal carbonate comprises a fluorescent calcium carbonate.

    8. The material of claim 7, wherein the material fluoresces under irradiation with a wavelength in the range of 200-400 nm.

    9. The material of claim 7, wherein the material fluoresces under irradiation with a wavelength in the range of 225-300 nm.

    10. A process for making a fluorescent material comprising mixing a calcium source, a mineral, and a carbonate.

    11. The process of claim 10, wherein the calcium source is an aqueous solution.

    12. The process of claim 10, wherein the aqueous solution comprises one or more of calcium chloride, calcium nitrate, calcium hydroxide, calcium sulfide, and calcium sulfate,

    13. The process of claim 10, wherein the mineral material comprises one or more of ground calcium carbonate, hematite, and diatomaceous earth.

    14. The process of claim 10, wherein the carbonate comprises one or more of NaHCO.sub.3, (NH.sub.4).sub.2CO.sub.3, Na.sub.2CO.sub.3, Li.sub.2CO.sub.3, K.sub.2CO.sub.3, KHCO.sub.3, NH.sub.4HCO.sub.3, and H.sub.2CO.sub.3.

    15. The process of claim 10, wherein the aqueous solution further comprises a metal.

    16. The process of claim 15, wherein the metal comprises one or more of Eu, Y, Sm, La, Ce, Pr, Nd, Pm, Gd, Tb, Dy, Ho, Er, Tm, Yb, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Ag, Cd, Lu, Hf, Ta, W, Re, Os, Ir, Pt, Au, and Hg.

    17. The process of claim 11, wherein the fluorescent material fluoresces under UV irradiation.

    18. The process of claim 17, wherein the fluorescent material fluoresces under irradiation with a wavelength in the range of 200-400 nm.

    19. The process of claim 18, wherein the fluorescent material fluoresces under irradiation with a wavelength in the range of 225-300 nm.

    20. A material comprising a mineral supporting a surface-modified carbonate, wherein the surface modification comprises the addition of ane or more components to alter the absorptivity, reactivity, or fluorescence of the material.

    21-25. (canceled)

    Description

    EXAMPLE 1

    [0072] Diatomaceous earth was decorated with precipitated calcium carbonate using the following method:

    [0073] First, 0.036 mol CaCl.sub.2 in 250 mL of water was dissolved with 0.01 mol percent Eu as EuCl.sub.2. A sample of 3.66 g diatomaceous earth was added to the mixture. After that, 0.073 mol NaHCO.sub.3 was also added. The resulting mixture was mixed, filtered, washed, and dried 120 C. for 3 hrs.

    [0074] The final product emitted red/orange fluorescence under UV (254 nm) irradiation.

    [0075] Other embodiments will be apparent to those skilled in the art from consideration of the specification and practice of the exemplary embodiments disclosed herein. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the claims.