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| Number | Title | Issue Date |
| 8128897 | Continuous process for purification of brine A continuous process for purification of brine contaminated with alkaline earth metals. The process comprises combining the brine with an aqueous solution containing at least one of an alkali metal hydroxide and an alkali metal carbonate with efficient mixing by a m... | 03/06/2012 |
| 7771682 | Process for the preparation of magnesia (MgO) from crude Mg (OH) The process provides for the preparation of MgO from the reaction of magnesium salt and alkali/lime. The crude Mg(OH)2 is directly calcined and then treated with water to disintegrate the mass spontaneously to yield a slurry and dissolve away the soluble ... | 08/10/2010 |
| 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 |
| 7198722 | Process for pre-treating and desalinating sea water Water containing dissolved salts, such as calcium sulfate, calcium chloride, magnesium sulfate, magnesium chloride, sodium carbonate, sodium chloride, sodium sulfate, calcium bicarbonate, and mixtures thereof, is treated to reduce the concentration of those salts. A... | 04/03/2007 |
| 7128887 | Platy precipitated calcium carbonate synthesis method A process for the preparation of platy PCC comprising the steps of providing a suspension of calcium hydroxide, carbonating the suspension of calcium hydroxide, adding a condensed phosphate to the suspension prior to the completion of carbonation to precipitate plat... | 10/31/2006 |
| 6409980 | Process and apparatus for treating foundry sludge to recover magnesium Process and apparatus for recovering magnesium from foundry sludge and cell bleed electrolytes includes structure and/or steps for: (i) dissolving, in a water slurry, soluble chloride compounds in the magnesium-containing material; (ii) acidifying the wat... | 06/25/2002 |
| 6132696 | Manufacture of precipitated calcium carbonate of improved color and stable crystalline form A method for the manufacture of precipitated calcium carbonate from impure calcium oxide of improved color is disclosed. The method comprises admixing impure calcium oxide with an aqueous solution consisting essentially of a salt of at least one compound ... | 10/17/2000 |
| 5342600 | Precipitated calcium carbonate A method of preparing precipitated calcium carbonate which comprises slaking quicklime in an aqueous medium, passing the suspension of calcium hydroxide through a sieve having an aperture size in the range of 40 to 70 microns, carbonating the calcium hydr... | 08/30/1994 |
| 4842833 | Method for separating barium from water-soluble strontium compounds A method for separating barium contaminants from soluble strontium compounds comprising adding sulfuric acid and a basic strontium compound in solid, suspended or dissolved form to an aqueous solution of a barium-contaminated soluble strontium compound in... | 06/27/1989 |
| 4572797 | Method for removing trace pollutants from aqueous solutions A method of substantially removing a trace metallic contaminant from a liquid containing the same comprises, adding an oxidizing agent to a liquid containing a trace amount of a metallic contaminant of a concentration of up to about 10-1 ppm, the ... | 02/25/1986 |
| 4409194 | Method of separating magnesium from wet process superphosphoric acid A method of separating magnesium from wet process superphosphoric acid by filtration characterized by no or minimizing agitation during the crystallization of the magnesium in order to form readily filterable agglomerates of MgH2 P2 ... | 10/11/1983 |
| 4374810 | Recovery of fluorine from pond water of wet process phosphoric acid plants and recycling of defluorinated water A process for obtaining calcium fluoride from the pond water of phosphoric acid plants and recycling the high phosphate defluorinated water to the pond is disclosed. Sufficient calcium carbonate is added to a solution having a pH of about 0.8, containing ... | 02/22/1983 |
| 4171342 | Recovery of calcium fluoride from phosphate operation waste water Calcium fluoride is produced from pond waters resulting from phosphoric acid processing by treating the pond waters with calcium carbonate and/or calcium oxide in two stages to precipitate out the major part of the fluorine values from the waters as calci... | 10/16/1979 |
| 4006215 | Recovering iron, nickel, or cobalt from sulfate solution Sulfate solutions containing at least one valuable metal from the group: Fe, Ni and Co, particularly solutions resulting from the leaching of lateritic ores or concentrates, are treated to recover the valuable metal. The latter is precipitated by treating... | 02/01/1977 |
| 3975283 | High bulk density magnesium chloride and method for making same A gelling agent is added to a brine containing magnesium chloride to convert the brine into a gel which is spray dried to produce dried magnesium chloride comprising substantially solid discrete particles of magnesium chloride having bulk densities in the... | 08/17/1976 |
| 3953570 | Process for the treatment of carburizing salt wastes This invention relates to a process for the treatment of the reaction mass produced during the joint elimination of barium-containing nitrite-/nitrate-bearing carburizing salt wastes and cyanide-/cyanate-bearing wastes by ignition of the dry mixture at el... | 04/27/1976 |
