Class 423/95 - Nitrating or sulfating

Subclass of Class 423 - Chemistry of inorganic compounds
Definition: Processes which include the step of chemically forming a
No. of patents: 23
Last issue date: 11/20/2001

Number	Title	Issue Date
6319482	Treatment of fly ASH/APC residues including lead salt recovery The present invention relates to a process for treating fly ash/APC residues chlorides, sulphates, earth alkali metals selected from the group consisting of calcium, potassium, and sodium, and heavy metals selected from the group consisting of lead, which...	11/20/2001
6214304	Method of removing mercury from a mercury-containing flue gas A method of removing mercury from a mercury-containing flue gas, especially flue gas from a refuse incinerator, is provided. The mercury-containing flue gas may also contain dust, further heavy metals, and further gaseous noxious gas components. The mercu...	04/10/2001
5460730	Process and apparatus for treating wastewater from lead battery production Lead oxide is used for neutralizing the sulfuric acid wastewater received from washing charged (formed) electrodes during lead battery production. The neutralization product, including lead sulfate and excess lead oxide, is returned directly to production...	10/24/1995
5348713	Recovery of metal values from zinc plant residues A process is disclosed for recovering zinc, lead, copper and precious metals from zinc plant residue, said process comprising leaching the residue with return zinc spent electrolyte, neutralizing residual acid and reducing ferric iron in the solution by a...	09/20/1994
5316751	Methods for mine tailing clean-up using recovery technologies A method for site remediation for mitigating contamination from metals or metal compounds, particularly resulting from the situation of mine tailing waste on or near water sources, including the reprocessing and redeposit of separated sands and slimes in-...	05/31/1994
4954322	Process for the recovery of metal values contained in a gangue The invention relates to a process for the recovery of metal values contained in a ferric gangue. The process comprises the following stages: (a) dissolution of the metal values from the ferric gangue with sulphuric acid; (b) recovery of the metal value or val...	09/04/1990
4937148	Process for preparing conductive fine particles Transparent conductive coatings excellent in transparency are provided on substrates such as glass, plastics, etc. by the use of conductive coating materials obtained by maintaining aqueous solutions of hydrolyzable tin containing or indium containing com...	06/26/1990
4927510	Hydrometallurgical process for recovering in pure metal form all the lead contained in the active mass of exhausted batteries A process for recovering in pure metal form substantially all lead from battery sludge is disclosed. The battery sludge is desulfurized, leached with acid, and separated by filtration. Lead is recovered from the filtrate by electrowinning. The residue fro...	05/22/1990
4824600	Preparation of a suspension in preparation of powder making A highly concentrated silver salt suspension and tin salt suspension from which a silver and tin oxide powder can be made under utilization of the reaction spray method is made by adding in small steps a tin II salt solution into a small volume of concent...	04/25/1989
4619814	Process for the recovery of non-ferrous metals from sulphide ores and concentrates This invention relates to the development of a viable metallurgical process capable of treating low grade concentrates, bulk concentrates, dirty concentrates, or ore directly for the recovery of non-ferrous metals such as zinc, lead, copper, and precious ...	10/28/1986
4610722	Process for metal recovery from steel plant dust A process is provided for hydrometallurgical processing of steel plant dusts containing cadmium, lead, zinc, and iron values, along with impurities such as chloride and fluoride salts of sodium, potassium, magnesium, etc. The first step in the process inv...	09/09/1986
4552629	Electrogalvanizing utilizing primary and secondary zinc sources A hydrometallurgical process is provided to electrogalvanize steel, utilizing primary and secondary zinc sources. The process consists of leaching the feed in a mildly acidic solution. The zinc is selectively recovered from the leach liquor in a solvent e...	11/12/1985
4545963	Process for separately recovering zinc and lead values from zinc and lead containing sulphidic ore A process for separately recovering zinc and lead values from zinc and lead containing sulphidic ore which also contains iron comprises subjecting ground ore to a first flotation step to float an initial lead concentrate containing zinc and produce zinc a...	10/08/1985
4374098	Method of concentrating silver from anode slime A method of concentrating silver from anode slime which comprises reacting an intermediate product obtained by treatment of the slime, the intermediate product containing lead in sulfate form and silver in chloride form, with an aqueous solution of an alk...	02/15/1983
4366127	Hydrometallurgical process for the recovery of lead, silver and gold, as well as zinc, from impure jarosite residues of an electrolytic zinc process The impure jarosite residue of an electrolytic zinc process is leached in a sulfuric-acid-bearing solution in order to produce a leach residue which contains lead, silver and gold and a ferrisulfate-bearing solution and to separate them from each other, w...	12/28/1982
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
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
4231993	Recovery of metal values from lead smelter matte A multi-step process for recovering metal values from lead smelter matte. The matte is mixed with sulfuric acid and manganese oxide and leaching is effected at atmospheric pressure to form an aqueous solution including dissolved metal sulfates and a resid...	11/04/1980
4024218	Process for hydrometallurgical upgrading This invention relates to a process for hydrometallurgical treatment of concentrates of sulphides of copper, nickel, cobalt, lead and iron and copper-containing mattes. A first embodiment of the process includes subjecting a finely ground slurry of a sulp...	05/17/1977
4004921	Treatment of lead sulphide A process for the treatment of lead sulphide with an aqueous solution of sulphur dioxide at a temperature of at least 20° C and in the absence of oxygen is disclosed. In a preferred embodiment the lead sulphate and/or lead sulphite so formed is heated wi...	01/25/1977
3981962	Decomposition leach of sulfide ores with chlorine and oxygen Complex sulfide ores or concentrates are decomposed by treatment with a combination of chlorine and oxygen, the amount of chlorine being limited to that necessary to convert sulfides of the desired metals, such as zinc, lead, copper, cadmium, silver, nick...	09/21/1976
3964901	Production of copper and sulfur from copper-iron sulfides A hydrometallurgical process for treating iron containing metal sulfides for rendering iron and non-ferrous metal values active and amenable for selective extraction and separate recovery. Sulfur values can be controllably produced as elemental sulfur or ...	06/22/1976
3954450	Recovery of lead, zinc and iron sulfide Lead is recovered from lead sulfide concentrates or mixed lead-zinc concentrates containing iron sulfide by forming a slurry of such concentrates in an aqueous medium containing ammonium sulfate and free ammonia, and introducing such slurry into a closed ...	05/04/1976

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Class 423/95 - Nitrating or sulfating