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| Number | Title | Issue Date |
| 8153088 | Method to prevent build-up of limestone in a lime slaker that is used for batchwise slaking of burnt lime A method to prevent build-up of limestone in a slaker that is used for batchwise slaking of burnt lime is described, in which lime slurry is produced with a greater degree of fineness and prolonged sedimentation time, where for immediate cleansing of the slaker befo... | 04/10/2012 |
| 7553462 | Method for the production of Mg (OH)nanoparticles A method for the production of Mg(OH)2 nanoparticles, by means of polyol-mediated synthesis, from an Mg precursor as well as a base. The particles produced with this method have a diameter between 10 nm to 300 nm, have a mono-disperse particle distributio... | 06/30/2009 |
| 7282188 | Method and device for producing a metal hydroxide The invention concerns a method and an apparatus for producing a metal hydroxide, in particular magnesium hydroxide, from a salt solution, wherein the metal is firstly precipitated from the salt solution and the suspension produced in that way is then filtered. The ... | 10/16/2007 |
| 7179438 | Methods and apparatus for recovering gypsum and magnesium hydroxide The present invention provides methods and apparatus for treating flue gas containing sulfur dioxide using a scrubber, and more particularly relates to recovering gypsum and magnesium hydroxide products from the scrubber blowdown. The gypsum and magnesium hydroxide ... | 02/20/2007 |
| 6814947 | Method for producing calcium compounds containing water of crystallization The invention relates to the production of calcium compounds containing water of crystallization by means of a chemical reaction between an aqueous alkaline sodium aluminate solution and solid or dissolved or suspended calcium (hydr)-oxide in the presence of carbon ... | 11/09/2004 |
| 6800260 | Processes for treating iron-containing waste streams Processes for treating iron containing waste streams are provided. According to these processes, metal-containing compounds, particularly iron oxides are produced. These methods may, for example, be used in the processing of the waste streams from the chlorination o... | 10/05/2004 |
| 6676910 | Processes for the causticisation of Bayer liquors in an alumina refinery An improved process for the causticisation of Bayer liquors in an alumina refinery includes a first step of reacting lime with aluminate ions in a Bayer liquor within a primary reactor operated at low to moderate temperature to form a hydrocalumite specie... | 01/13/2004 |
| 6428760 | Method for desulfurizing exhaust gas The present invention relates to the improvement of a replenishment method of a magnesium-based compound and to the improvement of a double decomposition method, which can be used in a magnesium hydroxide desulfurization method. In the improved replenishm... | 08/06/2002 |
| 6403045 | Method for treating residues resulting from the purification of garbage and/or industrial waste incineration fumes A method for treating residues derived from garbage and/or industrial waste incineration fumes including the steps of desalting the residues by washing with sodium carbonate in sufficient amount or slightly in excess to solubilize all the salts including ... | 06/11/2002 |
| 6328938 | Manufacture of titanium dioxide with recycle of waste metal chloride stream A method for the integration of a manufacturing facility with a salt dome, which manufacturing facility is one for the production of high purity titanium dioxide using chlorine as a reactant. The metal chlorides produced as a by-product of titanium dioxid... | 12/11/2001 |
| 6270631 | Method for conditioning fluidised bed combustor ashes A process for hydrating CaO residues in fluidized bed combustor ashes that achieves a better level of hydration, which does not add significantly to the cost of the hydration process, which reduces the consumption of water in the hydration process, and wh... | 08/07/2001 |
| 6267789 | Method for enriching raw salt Process for enriching crude salt, in which the crude salt is ground and then cooled in a saturated aqueous sodium chloride solution, to a temperature below the anhydrous sodium chloride to sodium chloride dihydrate transition temperature, a stock of a pow... | 07/31/2001 |
| 6231822 | Recovering chloride and sulfate compounds from spent potliner A method of recovering chloride and sulfate salts from spent potliner using acid digestion.... | 05/15/2001 |
| 6143260 | Method for removing magnesium from brine to yield lithium carbonate A method for producing lithium carbonate by precipitating magnesium as the hydroxide from a brine concentrated to a lithium concentration of about 6%. Lithium is then precipitated from the brine by addition of recycled limed mother liquor from a previous ... | 11/07/2000 |
| 6123908 | Method of treating spent potliner material from aluminum reduction cells A process of treating spent potliner material from aluminum reduction cells and recovering useful products. In the process of the present invention, spent potliner material is introduced into an acid digester containing, for example, sulfuric acid. As a r... | 09/26/2000 |
| 6110434 | Recovery of products from non-metallic products derived from aluminum dross A process for recovering one of alumina hydrate, magnesium hydroxide and magnesium aluminate spinel (MgAl2 O4) from aluminum dross wherein the dross is processed to a non-metallic product (NMP). The dross may contain fluxing salts wh... | 08/29/2000 |
| 5993759 | Production of lithium carbonate from brines Lithium carbonate can be efficiently produced from a brine by (i) removing the boron therefrom, (ii) diluting the boron-free brine, (iii) removing magnesium from the diluted brine, and (iv) adding sodium carbonate to thereby precipitate lithium carbonate.... | 11/30/1999 |
| 5980856 | Synthetic chalcoalumite-type compounds and processes for producing the same This invention relates to synthetic chalcoalumite-type compounds represented by formula (1) below: M2+a-x/2 Lix1+ Al43+ (OH)b (An-)c.mH.sub.2 O ... | 11/09/1999 |
| 5891320 | Soluble magnesium hydroxide A clear solution and a method for preparing the solution which has a pH in the range of from 10 to 13.9 and containing sulfate ions in a concentration range less than 500 parts per million. The solution is prepared by mixing two solutions in which one sol... | 04/06/1999 |
| 5851500 | Removal of uranium contamination from magnesium fluoride slag Magnesium fluoride slag contaminated with metallic uranium or uranium compounds is treated by digestion with potassium hydroxide to soluble potassium fluoride and insoluble magnesium hydroxide. The solid and liquid phases are then separated and the solids... | 12/22/1998 |
| 5738758 | Process for the conversion of calcium sulfide The disclosure relates to a process for the removal of solid CaS from a gas stream in which the CaS has been formed and then the conversion of that solid CaS by reaction with an aqueous NaOH solution to produce solid Ca(OH)2 and a liquor stream... | 04/14/1998 |
| 5409680 | Purification of aqueous alkali metal chlorate solutions A process for removing alkaline earth metal impurities (e.g. calcium and magnesium ions) from an aqueous alkali metal chlorate solution which includes adding sufficient alkali metal carbonate or hydroxide or both to the impure solution to raise the pH to ... | 04/25/1995 |
| 5407650 | Process for purifying a technical iron chloride solution by selective precipitation A process for purifying an acidic technical-grade iron chloride solution formed from cyclone dust from the production of TiO2 in accordance with the chloride process by adjusting the pH with a first neutralizing agent and thereafter introducing... | 04/18/1995 |
| 5332564 | Process for production of rhombic shaped precipitated calcium carbonate A process for producing rhombic or barrel shaped precipitated calcium carbonate. Quicklime is slaked in an aqueous solution containing about 0.1% to about 2% by weight of a sugar, based upon the weight of the CaCO3 to be produced. Carbon dioxid... | 07/26/1994 |
| 5286285 | Finely powdery magnesium hydroxide and a process for preparing thereof A finely powdery magnesium hydroxide especially suitable as a flame-retardant filler for plastic compounds, in which the particles are provided optionally with a thin coating of a surfactant. The grain size of the magnesium hydroxide, measured by laser di... | 02/15/1994 |
| 5270026 | Sulfur dioxide scrubbing process producing purified magnesium hydroxide A process for removing sulfur dioxide from flue gases where calcium sulfate and magnesium hydroxide are produced, with the magnesium hydroxide separated in an impure state and purified by addition of water thereto to dissolve contaminant calcium sulfate. ... | 12/14/1993 |
| 5132253 | Sol-gel method for making ceramic materials A method for synthesizing alkaline earth metal-containing ceramic materials by sol-gel processing is described, wherein a sol containing alkoxides or other soluble precursors for a selected ceramic composition, and additionally containing one or more diss... | 07/21/1992 |
| 5106600 | Process for producing tabular acicular gypsum crystals A process for economically producing tabular acicular gypsum crystals in a continuously stirred reactor is disclosed. The process involves establishing a steady state atmospheric pressure reaction zone of about 20% to about 25% by weight solids of gypsum ... | 04/21/1992 |
| 5091161 | Production of pure magnesium chloride solution from siliceous magnesium minerals A process for the production of pure magnesium chloride liquor from siliceous magnesium minerals comprises the steps of continuously leaching the siliceous magnesium mineral with a hydrochloric acid solution at a temperature higher than 50° C. but below ... | 02/25/1992 |
| 4997357 | Apparatus for treatment of power station residues The invention relates to a method of treating power station residues in the form of bulk material, particularly the filter ash from power stations, by hydrating the lime content by adding moisture and by further wetting of the bulk material, with an oppor... | 03/05/1991 |
| 4996032 | Process for removing sulfur dioxide from flue gases A process for removing sulfur dioxide from a flue gas in a wet scrubber with an aqueous slurry formed from calcium hydroxide and magnesium hydroxide with magnesium hydroxide or magnesium oxide recovered therefrom. A thickened sludge from a thickener conta... | 02/26/1991 |
| 4966710 | Method for removing magnesium and calcium from sodium sulfate solutions A method for removing magnesium and calcium from sodium sulfate solutions to render the solutions suitable for membrane processing, which comprises adjusting the pH of the solutions to about 11 to 13 with sodium hydroxide to form a precipitate containing ... | 10/30/1990 |
| 4956157 | Process for separating salts in seawater A process for obtaining available elements from seawater is described, which process includes two separation steps. The first separation step involved adjusting the pH of seawater to a low pH by adding a strong acid having sulphate ion, adding a strongly ... | 09/11/1990 |
| 4944928 | Process for producing pure magnesium oxide A process for the preparation of pure magnesium oxide, especially suitable for the preparation of refractory products, from magnesium silicate and magnesium hydrosilicate materials such as olivine, serpentine, garnierite, or the like, the starting materia... | 07/31/1990 |
| 4943301 | Granulation of magnesium oxide particles Magnesia pellets are formed from finely-divided, highly reactive, lightburned magnesia (MgO) particles by granulating such powders in conventional equipment using either an organic liquid or an organic liquid-binder mixture. The organic liquid may be an a... | 07/24/1990 |
| 4770860 | Porous hydroxyl apatite material A porous hydroxyl apatite material is disclosed which is made from calcium-rich basic skeletons of lime-encrusting algae converted into hydroxyl apatite and which serves for use as artificial bone, artificial tooth root, augmentation material, stabilizati... | 09/13/1988 |
| 4693872 | Process for producing highly pure magnesium hydroxide A process for producing highly pure magnesium hydroxide, which comprises reacting magnesium hydroxide starting material containing impurities, with an aqueous solution containing a water-soluble calcium salt and carbon dioxide to form an aqueous solution ... | 09/15/1987 |
| 4636379 | Process for producing calcium hydroxide A process is provided for producing dry calcium hydroxide by slaking finely divided or ground, softly burnt lime by carrying out the blending of slaking liquid consisting of 30 to 50 parts by volume water and 70 to 50 parts by volume organic solvent with ... | 01/13/1987 |
| 4557908 | Process for the treatment of a purge solution particularly intended for a process for the extraction of zinc by electrolysis The invention relates to the treatment of purge solutions formed in the process of the extraction of zinc by electrolysis. According to the invention, the purge solution, which consists of a part of the purified solution rich in zinc sulfate, is subjected to ... | 12/10/1985 |
| 4547349 | Method of slaking lime The invention is an improved lime slaker in which the lime is combined with the slaking liquor in a vertical conduit which extends below the level of the liquor in the slaker vessel. The slaking liquor is introduced into the conduit at a high velocity tan... | 10/15/1985 |
