Class 423/485 - Fluorspar

Subclass of Class 423 - Chemistry of inorganic compounds
Definition: Processes wherein the impure initial material is the mineral
No. of patents: 27
Last issue date: 07/19/2005

Number	Title	Issue Date
6920399	Method and apparatus for determining the composition of fluids A method and apparatus for analyzing a fluid to obtain the concentrations of N of its components, N being at least three. The method comprises the steps of bringing a sample of the fluid to a plurality of successive temperatures, measuring a combined total of at lea...	07/19/2005
6858198	Method for regulating water concentration in a process stream Provided is a method for regulating the concentration of water in the acid feed stream in a process for the production of HF by the reaction with a fluorine containing material, the method comprising: (a) providing an acid feed str...	02/22/2005
6841140	Method and apparatus for producing hydrogen fluoride As to a reactor which is used in a process for producing hydrogen fluoride through a reaction of fluorite with sulfuric acid, and which comprises means for applying a shearing force to a content therein between the means and an inner surface thereof, a metal materia...	01/11/2005
6821351	Hydrofluoric acid generating composition and method of treating surfaces The present invention relates to compositions, kits and processes for the brightening of metal surfaces by the application of the chemical compositions. These compositions act to release hydrofluoric acid as a brightening agent. The solutions are preferably mixed du...	11/23/2004
6699455	Process for preparing hydrogen fluoride in a rotary tube furnace The invention relates to a novel process for preparing hydrogen fluoride in a uniformly high conversion at a high space-time yield with minimal energy consumption by reaction of fluorspar with sulfuric acid in a rotary tube furnace, in which the furnace i...	03/02/2004
6579377	Hydrofluoric acid generating composition and method of treating surfaces The present invention relates to compositions, kits and processes for the brightening of metal surfaces by the application of the chemical compositions. These compositions act to release hydrofluoric acid as a brightening agent. The solutions are preferab...	06/17/2003
6440224	Hydrofluoric acid generating composition and method of treating surfaces A method of treating a surface of a metal is provided. A source of fluoride ion is mixed with a source of acid to form hydrofluoric acid and, when applied to a metal surface to be treated, the hydrofluoric acid acts as a brightening agent....	08/27/2002
6350426	Method of determining component concentrations in three-component mixture and method of continuous production of hydrogen fluoride using the method A method of quickly and safely determining the component concentrations of a three-component mixture comprising substantially sulfuric acid, hydrogen fluoride and water, which comprises measuring at least one set of three physical quantities of (1) temper...	02/26/2002
6207125	Recycling of flux material Flux residues from aluminium soldering fluxes composed of alkali metal metallates, especially fluoroaluminates of the alkali metals, in particular potassium and cesium, can be recycled by adding them to the reaction mixture used for the production of hydr...	03/27/2001
5271918	Furnace gas - sulfuric acid contact process for HF manufacture A method is provided wherein the equilibrium HF concentration in the mixture of HF, sulfuric acid and water fed to an HF reaction furnace is greatly reduced by injecting a controlled amount of steam into an HF-removal process wherein the sulfuric acid mix...	12/21/1993
5219551	Process for preparing hydrogen fluoride A process for preparing hydrogen fluoride, which comprises (i) reacting calcium fluoride with sulfuric acid to produce a gypsum and a gas containing hydrogen fluoride, (ii) separating hydrogen fluoride from said gas containing hydrogen fluoride, (iii) abs...	06/15/1993
5174972	Fluorogypsum waste solidification material A process, and the product produced thereby, for the preparation of a waste solidification material from hardened fluorogypsum as a by-product of the manufacture of hydrofluoric acid by reacting fluorospar with sulfuric acid, removing hydrogen fluoride fr...	12/29/1992
4935211	Fluorogypsum waste solidification material A process, and the product produced thereby, for the preparation of a waste solidification material from hardened fluorogypsum as a by-product of the manufacture of hydrofluoric acid by reacting fluorospar with sulfuric acid, removing hydrogen fluoride fr...	06/19/1990
4599156	Electrodialysis process for preparing hydrogen fluoride Hydrogen fluoride is produced by the electrodialysis of an alkali metal fluoride salt solution or an ammonium fluoride solution in an electrodialysis cell having an anode compartment and a cathode compartment spaced from one another by an inner electrodia...	07/08/1986
4491571	Process for producing hydrogen fluoride A process for producing hydrogen fluoride with use of fluorite as starting material and by conducting reactions in a first reactor and a second reactor wherein a reaction of fluorite with sulfuric acid, sulfuric anhydride and steam in the first reactor is...	01/01/1985
4477425	Production of anhydrous hydrogen fluoride from low-grade metallic fluorides and sulfuric acid A novel method is provided for the production of anhydrous hydrofluoric acid from low-grade metallic fluorides using an intermediate aluminum fluoride compound. The method involves the reaction of low-grade metallic fluorides such as fluorspar with sulfur...	10/16/1984
4460551	Process and device for manufacturing synthetic anhydrous calcium sulphate and pure hydrofluoric acid In the process for the production of synthetic anhydrite and pure hydrofluoric acid, a reaction is initiated using fluorspar with a mixture containing sulphuric acid, oleum and the reflux of the acidic scrubbing. The aim is to produce synthetic anhydrite ...	07/17/1984
4444740	Method for the recovery of fluorides from spent aluminum potlining and the production of an environmentally safe waste residue A method for recovery of fluoride values from spent potlining and fluoride containing insulating materials associated with the potlining is disclosed. Spent potlining and the insulating materials are reduced to a fine particle size and incinerated. The as...	04/24/1984
4394365	Method for curtailing phosphorous impurity in the production of hydrogen fluoride In the generation of hydrogen fluoride gas for the production of AlF3 by the reaction of fluorspar with concentrated sulphuric acid a small amount of aluminium sulphate is introduced into the reactive mix to assist in the retention of phosphoro...	07/19/1983
4310501	Process for producing hydrogen fluoride A method of recovering fluorine, e.g. as hydrogen fluoride, from wastes of aluminum electrolysis furnaces, chemisorbents, adsorbents or absorbents, etc. in which the fluorine-containing material is subjected to pyrohydrolysis in an expanded fluid bed and ...	01/12/1982
4292289	Process for producing hydrogen fluoride and phosphoric acid An improved method for producing hydrogen fluoride from fluoride bearing ores, such as fluorospar and fluorapatite, by reaction of the ore as a slurry in fluorosulfonic acid. The slurry is heated by the exothermic heat of the reaction to vaporize volatile...	09/29/1981
4150102	Purifying hydrofluoric acid A process for the production of highly pure concentrated hydrofluoric acid by purifying crude HF gas containing H2 O, SO2, SiF4, S,CaF2, H2 SO4 and CaSO4 and obtained in the reaction ...	04/17/1979
4120939	Hydrogen fluoride process Anhydrous hydrogen fluoride is manufactured by dropping small particles of a metal fluoride, e.g., calcium fluoride, through a reaction zone countercurrent to a gas stream containing sulfur trioxide, sulfuric acid and water vapor....	10/17/1978
4078047	Production of hydrofluoric acid from phosphate-containing fluorspar In the reaction of phosphate-containing fluorspar with sulphuric acid to produce gaseous hydrofluoric acid, withdrawing the hydrofluoric acid and condensing it, the improvement which comprises adding to the fluorspar a reactive iron compound in an amount ...	03/07/1978
4031191	Process for producing hydrogen fluoride There is disclosed an improvement in the process of manufacturing HF wherein sulfur accumulates in HF process equipment. The improvement comprises adding to the process equipment sufficient SO3 to remove the sulfur and emptying the equipment....	06/21/1977
4010245	Production of hydrogen fluoride and calcium sulfate In the production of hydrofluoric acid and calcium sulfate by subjecting sulfuric acid and fluorspar to a partial preliminary reaction in a preliminary reaction zone and the reaction is completed in an after-reaction zone at a temperature from about 100°...	03/01/1977
3996340	Method of producing aluminum fluoride A method of disposing of silica dust recovered from the smoke of metallurgical furnaces by producing aluminum fluoride therefrom for use in electrolytic melting furnaces is disclosed. Fluorspar and the precipitated amorphous silicon dioxide are treated wi...	12/07/1976

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Class 423/485 - Fluorspar