Composition Comprising Calcium Magnesium Compound(s) as Compacts
AssigneeS. A. Lhoist Recherche et Developpement
InventorsGuillaume Criniere, Thierry Chopin
Life of this patent
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Abstract
Composition comprising at least one calcium-magnesium compound and a second compound chosen in the group consisting of B2O3, NaO3, calcium aluminate, calcium silicate, calcium ferrite such as Ca2Fe2O5 or CaFe2O4, Al, Mg, Fe, Mn, Mo, Zn, Cu, Si, CaF2, C, CaC2, CaSi, CaMg, CaFe, FeMn, FeSi, FeSiMn, FeMo; TiO2, an oxide or a hydroxide of molybdenum, copper, zinc, and their mixture, in the form of compacts formed with compacted and shaped particles of calcium-magnesium compounds, having a Shatter Test Index of less than 20% and the manufacturing process thereof.
Claims29
A composition comprising at least one calcium-magnesium compound fitting the formula aCaCO3.bMgCO3.xCaO.yMgO.zCa(OH)2.tMg(OH)2.ul, wherein I is impurities;
- a, b, z, t and u each being mass fractions ≧0 and ≦50%, x and y each being mass fractions ≧0 and ≦100%, with x+y≧50% by weight, based on the total weight of said at least one calcium-magnesium compound, characterized in that
- said at least one calcium-magnesium compound is in the form of particles, said composition has a cumulative calcium and magnesium content in the form of oxides, greater than or equal to 20% by weight based on the total weight of the composition,
- said composition further comprises at least one second compound selected from the group consisting of B2O3, NaO, calcium aluminate, calcium silicate, calcium ferrite selected from the group consisting of Ca2Fe2O5 and CaFe2O4, metal Al, metal Mg, metal Fe, metal Mn, metal Mo, metal Zn, metal Cu, elemental Si, CaF2 CaC2, alloys selected from the group consisting of CaSi, CaMg, CaFe, FeMn, FeSi, FeSiMn, FeMo;
- TiO2, an oxide based on molybdenum, an oxide based on copper, an oxide based on zinc, a hydroxide based on molybdenum, a hydroxide based on copper, a hydroxide based on zinc and their mixture,
- said composition is in the form of compacts, each compact being formed with compacted and shaped particles of calcium-magnesium compounds, said compacts having a Shatter Test Index of less than 20%.
(canceled)
A method for making a composition in the form of a compact comprising the following steps:
- a) providing particles of at least one calcium-magnesium compound fitting the formula aCaCO3.bMgCO3.xCaO.yMgO.zCa(OH)2.tg(OH)2.uI, wherein I represents impurities, a, b, z, t and u each being mass fractions ≧0 and ≦50%, x and y each being mass fractions ≧0 and ≦100%, with x÷y≧50% by weight based on the total weight of the calcium-magnesium compound,
- b) adding at least one second compound to the particles of at least one calcium-magnesium compound, selected from the group consisting of B2O3, NaO3, calcium aluminate, calcium silicate, calcium ferrite such as Ca2Fe2O5 or Ca2Fe2O4, metal Al, metal Mg, metal Fe, metal Mn, metal Mo, metal Zn, metal Cu, elemental Si, CaF2C, CaC2, alloys such as CaSi, CaMg, CaFe, FeMn, FeSi, FeSiMn, FeMo;
- TiO2, an oxide based on molybdenum, an oxide based on copper, an oxide based on zinc, a hydroxide based on molybdenum, a hydroxide based on copper, a hydroxide based on zinc and their mixture, at a content equal or greater to 1 weight % based on the total weight of the composition,
- c) mixing said particles and the second compound until an homogeneous composition is reached,
- d) providing said homogeneous composition in a confinement space between two punches having a section comprised between 1 and 40 cm2,
- e) compacting said homogeneous composition for forming a compact product with a three-dimensional shape, by applying a compaction pressure comprising 200 MPa and 800 MPa,
- f) releasing the compaction pressure and
- g) ejecting said compact product from said confinement space.
(canceled)
Dependencies are inferred from the claim text.