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| Number | Title | Issue Date |
| 4818514 | Method for recycling NO in a system producing ferric sulfate The present invention provides a method of using air to reclaim and recycle potentially contaminating NO in a system producing ferric sulfate solution from the oxidation of ferrous sulfate and sulfuric acid in the presence of NO and oxygen. The present in... | 04/04/1989 |
| 4814106 | Manufacture of a basic metal hydroxysulfate complex in solid form A product containing calcium sulfate hemihydrate and polynucleate basic metal hydroxysulfate complex in solid form provides a positively charged polynucleate complex possessing charge neutralizing properties in systems containing suspended or colloidal ne... | 03/21/1989 |
| 4814158 | Process for making liquid ferric sulfate A process for the production of liquid ferric sulfate from finely-divided ferric oxide, sulfuric acid and water in a closed reaction vessel at temperatures ranging from about 130° C. to about 150° C. and pressures from about 30 psi to about 40 psi. The ... | 03/21/1989 |
| 4707349 | Process of preparing a preferred ferric sulfate solution, and product A process is provided for preparing a preferred ferric sulfate solution. The product of the process is particularly suited for use in water treatment and purification. According to the process, iron oxides or iron, are dissolved in sulfuric acid to form f... | 11/17/1987 |
| 4693881 | Simultaneous separation and conversion to sulfur of H2 S This invention is a regenerable process for converting H2 S to S by (1) reacting the H2 S with Fe2 (SO4)3 to form S, FeSO4 and H2 SO4 ; (2) separating the S; oxidizing the ... | 09/15/1987 |
| 4659557 | Process for producing ferrous sulphate in granule form In a process for making ferrous sulphate in granule form, ferrous sulphate heptahydrate is mixed with fine-grain brown coal or lignite having a low water content, in such an amount that the resulting mixture is pourable.... | 04/21/1987 |
| 4652435 | Stabilized ferrous compound composition A composition comprising a ferrous compound and as a stabilizer, at least one compound selected from the group consisting of (A) erythorbic acid compounds, (B) hydroxycarboxylic acid compounds and (c) oxocarboxylic acid compounds.... | 03/24/1987 |
| 4507273 | Oxidation process for production of acidic ferric sulphate Production of an acidic ferric sulphate from ferrous sulphate heptahydrate by drying the heptahydrate at a temperature within the range 40° to 50° C. and then at a temperature of from 54° to 65° C. to produce a partially dehydrated product containing ... | 03/26/1985 |
| 4457897 | Process for the selective dissolution of cobalt from cobaltite-pyrite concentrates A hydrometallurgical process for the recovery of cobalt from cobaltite-pyrite concentrates containing substantial amounts of cobalt, arsenic, iron and sulphur is disclosed. The hydrometallurgical process comprises pressure leaching of the cobaltite-pyrite... | 07/03/1984 |
| 4382916 | Method of preparing hydrochloric acid and high purity ferrous sulfate hydrate crystals from hydrochloric acid waste pickle liquor A method of recovering a wide range of hydrochloric acid concentrations and high quality ferrous sulfate by-product in several hydrate forms from waste pickle liquor containing ferrous chloride. The waste pickle liquor is concentrated in a concentrator cr... | 05/10/1983 |
| 4292085 | Method for converting into a non-polluting particulate product the ferrous sulphate obtained in the production of titanium dioxide by the sulphate process Ferrous sulphate heptahydrate obtained as a by-product of the production of titanium dioxide by the sulphate process is converted into a non-polluting, free-flowing particulate neutralization product by contacting said sulphate with calcium hydroxide as a... | 09/29/1981 |
| 4288423 | Method of recovering metallic tellurium A method of recovering metallic tellurium from a residue dust containing a major amount of lead oxide, a minor amount of tellurium oxide, and a minor amount of iron oxide which comprises the steps of introducing the residue into a leach tank containing wa... | 09/08/1981 |
| 4284608 | Process for regenerating sulfur dioxide gas scrubbing solutions It is known to remove sulfur dioxide from gas streams, particularly waste or flue gases, by contact with aqueous scrubbing solutions containing a metal salt, such as ferric sulfate, in which the valence of the metal is reduced by the sulfur dioxide. It is... | 08/18/1981 |
| 4256485 | Enzyme oxidation of sulfides in minerals A process for treating sulfide ores to reduce the sulfur content or recover the metal content therefrom comprises the use of enzymatic action to solubilize the sulfur and metal content. A nutrient, such as a saccharide, is used along with yeast spores which ... | 03/17/1981 |
| 4238466 | Absorption of sulfur dioxide from gases by ferrous sulfate This application is directed to the use of ferrous sulfate for absorption of sulfur from gases containing the same. The invention is predicated on the reaction of the sulfur oxides with ferrous sulfate in the presence of oxygen to form principally ferric ... | 12/09/1980 |
| 4222997 | Method of recovering hydrochloric acid from spent hydrochloric acid pickle waste A method of recovering hydrochloric acid from spent hydrochloric acid pickle liquor is used to increase the amount of hydrochloric acid recovered and to improve the form of the waste products for better handling and reduced energy costs. The waste pickle ... | 09/16/1980 |
| 4198377 | Process for recovering manganese from aqueous acidic sulphate solutions The present invention relates to a process for the recovery of manganese from aqueous acidic solution. The process comprises the steps of, (a) introducing into the solution peroxymonosulphuric acid (PMS) in a plurality of stages, normally from 2 to 6, oft... | 04/15/1980 |
| 4133865 | Process for preparing metallic sulphates An improved process for preparing a metallic sulphate in a reaction zone from mixing of the corresponding metallic sulphide concentrates with ammonium sulphate and heating. Heating preferably includes directly contacting the mixture with products of combu... | 01/09/1979 |
| 4070441 | Method of removing sulfur dioxide from flue gases The sulfur dioxide containing flue gases are passed through a gas scrubber containing an aqueous solution of a metal salt which can be reduced by sulfur dioxide from a high valence state to a lower valence state. This oxidizes the sulfur dioxide to either... | 01/24/1978 |
| 4062924 | Reductive leaching of limonitic ores with hydrogen sulfide A process is provided for extracting iron values as soluble ferrous salts from a limonitic ore which comprises leaching the ore in an acidic medium in the presence of a reducing agent, the reducing agent being a sulfide. Non-ferrous metal values are also ... | 12/13/1977 |
| 4055631 | Production of iron sulfate monohydrate A process for the production of high purity iron sulfate monohydrate from an iron sulfide mineral feed involving a leaching, purification, crystallization and dehydration procedure to recover a solution of iron sulfate containing iron sulfate polyhydrates... | 10/25/1977 |
| 4036941 | Preparation of ferric sulfate solutions A process for recovery of iron from an iron mud containing a mixture of gypsum and ferric hydroxide, which comprises contacting said gypsum and ferric hydroxide mixture with sulfuric acid of a concentration between 93 and 98% for a period of 1 to 12 hours... | 07/19/1977 |
| 4005987 | Process for drying moist materials, particularly crystalline solids containing water of hydration A process for drying moist material, particularly substances containing water of crystallization, in which the material is passed in counterflow through a shaft to gases having an inlet temperature of 200° to 1000° C. The gas rises at a velocity of 2 to... | 02/01/1977 |
| 4005175 | Process for the joint production of sodium tripolyphosphate and titanium dioxide A process for the joint production of titanium dioxide and sodium tripolyphosphate from ores of titanium and phosphorus, and from sulphuric acid, in which the titanium dioxide is produced by the "sulphate process" and the impure dilute aqueous solution of... | 01/25/1977 |
| 3995012 | Process of producing hydrogen and oxygen from H2 O in a thermochemical cycle A method of producing hydrogen and oxygen by splitting water in a thermocical cycle, according to which in a first method stage a gas mixture of from 1 to 50 parts by volume of steam and 2 parts by volume of sulfur dioxide is reacted at a temperature wit... | 11/30/1976 |
| 3991108 | Carboxylate fluorination process A process for the fluorination of carboxylate compounds to the corresponding acyl fluoride or carbamoyl fluoride, the latter compounds decompose to isocyanates and hydrogen fluoride, wherein the carboxylic acid, its anhydride or metal salt is intimately m... | 11/09/1976 |
| 3984312 | Process for insolubilizing potentially water pollutable wastes from sodium or ammonium type sulfur dioxide air pollution control systems Process for insolubilizing water soluble wastes from alkaline sodium or ammonium type sulfur dioxide control systems used in conjunction with industrial or power plants. The sodium or ammonium sulfite or sulfate wastes are reacted in solution with ferric ... | 10/05/1976 |
| 3960513 | Method for removal of sulfur from coal A process for reducing the amount of free and combined sulfur, such as pyritic, organic or elemental sulfur in coal; removing of these sulfur species may be made in an acid, basic or neutral solutions; at least 50 percent and up to 90 percent of sulfur, b... | 06/01/1976 |
| 3954953 | Energy conserving process for manufacturing ferric sulfate A continuous process for producing granular ferric sulfate significantly reduces manufacturing time, increases product output through the elimination of the curing stage employed in batch-type processes, and because of reduced heat requirements consumes l... | 05/04/1976 |
