60results about "Calcium/strontium/barium halides" patented technology

A method for producing a nitride semiconductor, comprising controlling temperature and pressure in a autoclave containing a seed having a hexagonal crystal structure, a nitrogen element-containing solvent, a raw material substance containing a metal element of Group 13 of the Periodic Table, and a mineralizer so as to put said solvent into a supercritical state and/or a subcritical state and thereby ammonothermally grow a nitride semiconductor crystal on the surface of said seed, wherein the crystal growth rate in the m-axis direction on said seed is 1.5 times or more the crystal growth rate in the c-axis direction on said seed. By the method, a nitride semiconductor having a large-diameter C plane or a nitride semiconductor thick in the m-axis direction can be efficiently and simply produced.

The invention generally relates to methods of selectively removing lithium from various liquids, methods of producing high purity lithium carbonate, methods of producing high purity lithium hydroxide, and methods of regenerating resin.

Alkaline or neutral viscoelastic cleaning compositions are disclosed which use non polymer thickening agents. According to the invention, cleaning compositions have been developed using viscoelastic surfactants in a neutral, acidic or alkaline cleaning formulations. These provide the dual benefit of thickening as well as an additional cleaning, thereby improving performance. Applicants have also identified several pseudo linking agents which when, used with viscoelastic surfactants provide viscoelasticity in alkaline cleaning compositions.

A process for the removal of pollutants from a combustion process and, more particularly, a process for removing pollutants such as carbon dioxide, mercury, sulphur dioxide, nitrogen compounds and oxygen compounds from a combustion process. The process includes the removal of pollutants from a combustion process that produces an emission comprising: cooling the emission to a temperature of about 200° C.; removing nitrogen, water and oxygen from the emission to produce a gas containing a concentration of pollutants; contacting the gas with an aqueous magnesium chloride solution, wherein a slurry mixture is formed; and cooling the gas and the slurry mixture, wherein hydrochloric acid vapour and a sludge are formed.

A method of producing metal chlorides is disclosed in which chlorine gas is introduced into liquid Cd. CdCl₂ salt is floating on the liquid Cd and as more liquid CdCl₂ is formed it separates from the liquid Cd metal and dissolves in the salt. The salt with the CdCl₂ dissolved therein contacts a metal which reacts with CdCl₂ to form a metal chloride, forming a mixture of metal chloride and CdCl₂. After separation of bulk Cd from the salt, by gravitational means, the metal chloride is obtained by distillation which removes CdCl₂ and any Cd dissolved in the metal chloride.

A process for formulating high purity potassium chloride from a carnallite source. The process takes advantage of solubility differences and saturation levels in a multiple salt system generated upon dissolution of carnallite. In the system, the sodium chloride is kept in solution and the magnesium chloride present in the system is controlled to be in a concentration range of between 12% and 25% by weight. This avoids co-precipitation of sodium chloride with the potassium chloride during crystallization and therefore prevents the sodium chloride from contaminating the potassium chloride. The result is high grade potassium chloride.

A method of treating solid containing material derived from effluent or sludge from a plant for de-inking paper, the material containing calcium in the form of one or more insoluble calcium compounds, the method including the steps of treating the material with an acid to cause dissolution of the calcium thereby forming a calcium ion-containing solution in which insoluble solids are suspended, separating the solution from the insoluble solids and incinerating the separated solids. The solution containing calcium ions may be treated by adding one or more reagents to form a calcium compound precipitate, eg calcium carbonate. The particulate solids produced following the incineration step and following the precipitate formation may be employed as pigments or fillers in paper making or paper coating.

A unique production of titanium compounds and metal by sustainable methods using iron-titanium oxide starting material such as ilmenite, leucoxene, or rutile is described. Here the iron-titanium oxide compound is prepared by converting the iron portion of the compound to ferrous chloride at low temperatures by using close to stoichiometric amounts of sulfur and chlorine required for all the iron oxides and the other non-titanium oxides. The ferrous chloride thus formed is removed recovering a marketable product of ferrous chloride and the ‘sustainable’ titanium oxide starting material by additional process steps. This can be converted to ‘sustainable’ titanium metal, or titanium tetra-chloride by process shown herein for further conversions to titanium dioxide pigment by present chloride process or supplied to existing titanium sponge producers, benefitting them in having a ‘sustainable process’.

This invention relates to a halide-type photostimulable phosphor having improved moisture resistance and brightness, and a process for producing the same. The halide-type photostimulable phosphor is characterized in that, among elements constituting the outermost surface and inside of the phosphor, there is a difference in composition ratio of a halogen element between the outermost surface and the inside of the phosphor. A radiation image conversion panel, which has been improved, for example, in moisture resistance, brightness and image quality by using the phosphor, and a process for producing the same are also provided.

Methods of enhancing the solubility of a fluorinated compound in an organic solvent are provided. In one embodiment, carbon dioxide gas pressure is applied to the solvent at a pressure effective to enhance the solubility of the fluorinated compound. The method may further include recrystallizing the fluorinated compound by reducing the pressure of the carbon dioxide gas. Also provided are methods of conducting a reaction using a fluorinated compound in an organic solvent In one embodiment, the method comprises applying carbon dioxide pressure to an organic solvent comprising at least one substrate and a fluorinated catalyst, in an effective amount to solubilize the catalyst; and permitting the fluorinated catalyst to catalyze the reaction of the substrate to form a product. The catalyst is optionally separated from the reaction product and solvent after the reaction by the release of the pressure.

The present invention provides a method for sanitising water in a swimming pool or the like, which method uses sources of ionic chlorine at significantly lower levels than conventional systems. The method comprises the steps of (i) forming, in the swimming pool water, an electrolyte solution containing from 500 ppm to 9000 ppm of a soluble magnesium halide salt, (ii) treating the electrolyte solution in an electrolytic halogenation cell to form an aqueous solution of hypohalous acid, and (iii) returning the water so treated back to the swimming pool. A mixture of magnesium, potassium and sodium chloride salts with small quantities of a soluble alkaline earth metal bromide, zinc halide, ascorbate, and/or zinc ascorbate may be particularly effective in the sanitisation process.

A method of dividing single crystals, particularly of plates of parts thereof, is proposed, which can comprise: pre-adjusting the crystallographic cleavage plane (2′) relative to the cleavage device, setting a tensional intensity (K) by means of tensional fields (3′, 4′), determining an energy release rate G(α) in dependence from a possible deflection angle (α) from the cleavage plane (2′) upon crack propagation, controlling the tensional fields (3′, 4′) such that the crack further propagates in the single crystal, wherein G(0)≧2γ_e(0) and simultaneously at least one of the following conditions is satisfied:

The invention relate to a method for preparing high-purity anhydrous strontium iodide. The method comprises the following steps: dropwise adding hydroiodic acid into a reaction vessel containing an aqueous solution containing a strontium compound under stirring until the pH of the solution is 5-6 to obtain an iodide-strontium aqueous solution; regulating the pH value of the iodide-strontium aqueous solution to 7-9 for filtering; after concentrating filtrate to near saturation, quickly lowering the temperature to 0-4 DEG C and precipitating crystal substances; filtering to obtain the crystal substances dissolving in water, and obtaining a purified iodide-strontium aqueous solution; heating the purified strontium iodide aqueous solution to 150-200 DEG C under the flowing inert shielding gas, and preserving heat for 1-30 hours to dehydrate to obtain a SrI2.xH2O white flurry material, wherein x is less than or equal to 1; grinding the white flurry material into powder in an anhydrous and oxygen-free inert atmosphere, and putting in a glass vessel; under vacuum, heating the glass vessel to 350-450 DEG C and preserving heat for 1-20 hours to remove crystal water in the powder, and naturally lowering the temperature to room temperature in the condition of keeping vacuum; heat-sealing the glass vessel in the condition of keeping vacuum.

A method of producing calcium chloride including first forming a slurry of solid calcium oxide in an aqueous solution of calcium chloride, and then contacting the slurry with hydrochloric acid to convert at least a portion of the calcium oxide into calcium chloride.

The invention belongs to the field of waste reuse. Carbide slag is a waste generated in an acetylene production process using a calcium carbide method; and the main component is Ca(OH)2 the content of which exceeds 85%. The byproduct magnesium salt of the salt lake sylvite industry is mainly used for producing cheap magnesium chloride hexahydrate and magnesium sulfate heptahydrate, or is exported directly in a mineral form, causing waste of resources. According to the invention, high-purity magnesium hydroxide as well as anhydrous calcium chloride is produced by use of carbide slag and salt lake magnesium chloride by an ammonium chloride circulation method; and the method not only can obtain high-purity magnesium hydroxide and industrial-grade calcium chloride, but also can effectively solve the problem of environmental pollution caused by ammonia gas in magnesium hydroxide produced by an ammonia method. The study promotes energy conservation, emission reduction and low-carbon economy, and realizes great environmental benefits, social benefits and economic benefits.