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6379421 |
Method and apparatus removing undesirable metals from iron-containing materials
The present invention relates to a method and apparatus for separating undesired toxic metals, such as Zn, Pb and Cd, from iron-containing materials by: sintering a mixture of such materials...
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6315810 |
Process for vitrifying heavy-metal-containing residues having a chlorine content above 10% by mass and a melting furnace for carrying out the process
In a process for vitrifying heavy-metal-containing residues having a chlorine content above 10% by mass, in particular from flue gas cleaning, which are melted in a melting furnace, the...
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6270551 |
Process for treating metal oxide fines
A process for recovering iron from iron-bearing materials including steel mill waste and iron-bearing ores. The process includes the steps of providing a mixture of iron-bearing materials having...
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6159268 |
Process for pyrometallurgical processing in a furnace chamber, of metal-containing waste
The invention relates to a process for pyrometallurgical processing, in a furnace chamber, of metal-containing waste which may also contain a quantity of organic material. The process involves a...
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6120577 |
Treatment of steel mill waste metal oxides
A process of recovering iron values and separating zinc oxides and other contaminants from steel mill waste metal oxides, such as blast furnace dust, BOF dust, mill scale and oily sludges,...
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6053963 |
Method for treating rotary slag
The present invention provides a method for treating rotary slag containing iron and sodium compounds. The method involves treating the slag in a sulfuric acid solution to convert the iron and...
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5944869 |
Method for the recovery of lead from exhausted lead acid storage batteries
An improved method for the recovery of lead from exhausted lead-acid storage batteries, comprising removal from the storage battery of the sulphuric acid solution, the coating element, the...
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5871561 |
Method of treating dusts containing oxides
Dusts containing zinc and/or lead in the form of oxides and one or more reducing agents are mixed with each other before or after being introduced into a heat treatment furnace. The mixture is...
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5364447 |
Method of recycling hazardous waste
A smelting process for blending hazardous and non-hazardous inorganic industrial wastes with carbon or aluminum reducing agents to simultaneously recover metal alloys (reducible metals), metal...
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5256186 |
Method for the treatment of dusts and concentrates
A method for the treatment of a mixture of lead dusts and pyritic concentrates said method including the steps of: a) feeding a mixture of lead dust and pyritic concentrate to a furnace...
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5246484 |
Process for reducing nonferrous metal oxides in slags
In the reduction of liquid slags or molten salts which contain nonferrous metal oxides and are disposed over a liquid metal layer consisting of the corresponding nonferrous metal oxides and are...
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5186741 |
Direct reduction process in a rotary hearth furnace
The invented pellet reclamation process includes forming green pellets of a mixture of steel furnace dust, a carbonaceous material such as coal, charcoal, lignite, petroleum coke, or coke, and an...
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5139567 |
Process for recovering valuable metals from a dust containing zinc
There is disclosed a process for recovering valuable metals from a dust containing zinc comprising mixing the dust containing zinc with a reductant and a flux for regulating the basicity of slag,...
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5108497 |
Treatment of indium dusts
Indium-containing feedstocks, such as flue dusts from a refining or smelting process, are treated to increase the concentration of indium and at the same time to reduce the concentrations of lead,...
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4963182 |
Continuous feed shaft retort process for recovery of non-ferrous metals from process dust
A method and apparatus for recovering primary metals from pyrometallurgical process dust, in which a vertical shaft retort, situated in a furnace or afterburner associated with a pyrometallurgical...
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4909839 |
Secondary lead production
Disclosed is a method for recovering lead from a scrap which contains lead oxide, lead sulfate and antimony in an oxidized state. The method comprises the steps of: (a) continuously charging a...
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4705564 |
Flow-through electrolytic cell
A flow-through electrochemical cell for sequentially oxidizing and reducing an aryl compound. The cell includes a cell body forming a compartment to hold an aqueous electrolyte solution, a porous...
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4673431 |
Furnace dust recovery process
A process for selective vaporization of oxides from recovered waste dust collected from a bag house. Pellets are formed from the waste dust and dried to permit charging in an oxidizing chamber...
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4639269 |
Method and apparatus for the reducing treatment of molten metals and/or slags thereof
A method and apparatus for reducing molten metals and/or slags thereof which involves top-blowing at least one reduction gas stream wherein fine grained coal or coke particles and injected for...
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4612041 |
Process for recovering valuable metals from an iron dust containing a higher content of zinc
A process for recovering valuable metals from an iron dust with a high concentration of zinc comprising (1) pelletizing said dust into a pellet in a pelletizer, (2) preheating the resulting pellets...
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4584017 |
Method for producing metallic lead by direct lead-smelting
The invention relates to a method for producing metallic lead from lead-containing starting materials by an oxidizing smelting process and subsequent reduction of the resultant oxidic molten bath....
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4571260 |
Method for recovering the metal values from materials containing tin and/or zinc
The invention relates to a method for recovering the metal values from materials containing at least one of zinc and tin, by smelting the starting materials under oxidizing conditions and reducing...
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4491470 |
Method for separating non-ferrous metals from ferruginous secondary substances
A method for separating non-ferrous metals from ferruginous secondary substances such as residues and slurries from blast furnaces, steel mills, rolling mills, and the like. In accordance with the...
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4447262 |
Destruction of halogen-containing materials
An organic waste containing halogen is destroyed by treatment in a molten salt pool comprising a mixture of a basic alkaline earth metal compound with an alkaline earth metal halide. An...
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4441923 |
Integrated process using non-stoichiometric sulfides or oxides of potassium for making less active metals and hydrocarbons
Disclosed is a combinative integrated chemical process using inorganic reactants and yielding, if desired, organic products. The process involves first the production of elemental potassium by the...
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4410361 |
Method for desilverizing and removal of other metal values from lead bullion
A batch process for desilverizing and refining lead bullion containing antimony and a low silver content, including the steps of melting the lead bullion, adding calcium to form a floating...
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4396423 |
Process for recovering iron and zinc from steel making dusts
The object of the invention is to provide a process for the recovery of iron and zinc from steel making flue dust. The process comprises subjecting the flue dust to a carbiding step in a fluid bed...
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4389247 |
Metal recovery process
A process for recovering a metal in its elemental state from an oxide or salt of the metal comprising passing the metal oxide or salt and a reducing gas concurrently downward through a packed bed...
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4376754 |
Pyrometallurgical smelting of lead and copper
A method of smelting an oxide charge containing lead and copper in a blast furnace, wherein molten lead bullion flowing to the furnace bottom and containing at least 8% by weight of copper is...
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4372780 |
Process for recovery of metals contained in plombiferous and/or zinciferous oxide compounds
Process for recovery of zinc and lead contained in oxidized zinc and lead compounds characterized by the facts that, after drying, the compound is injected into a pig iron bath and the gasses...
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4334919 |
Method of introducing particulate material and a gas into a reactor
A sprinkler burner and method for injecting solid particulate material and a gas into a reactor as a paraboloidal suspension. Means are provided to introduce the gas tangentially into an outer...
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4261743 |
Pyrometalurgical smelting of lead and copper
A method of smelting an oxide charge containing lead and copper in a blast furnace, wherein molten lead bullion flowing to the furnace bottom and containing at least 8% by weight of copper is...
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4252563 |
Process for the fuming treatment of metallurgical slag
A continuous process for the fuming treatment of metallurgical slag, e.g. lead and copper smelting furnace slag. Passing the slag continuously through consecutive slag treatment zones of a fuming...
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4251271 |
Submerged injection of gas into liquid-pyrometallurgical bath
A method of injecting gas into a pyrometallurgical bath is disclosed, wherein the gas is injected through a lance having an interior duct for flow of gas therethrough and a discharge end at which...
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4210441 |
Method for the continuous or discontinuous treatment of molten slag, particularly with contents of heavy metal oxides, for the recovery of portions contained therein of valuable metals or their combinations, respectively
A method and mechanism for treatment of molten slag having heavy metal oxides for the recovery of valuable metals contained therein through precipitation during slag melting and volatilization out...
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4168156 |
Method of and electric furnace for processing nonferrous molten slags
A method comprising the steps of supplying a carbonaceous reducer in a layer onto the surface of molten slag and feeding an oxygen-free gas into said slag in an amount and at a rate ensuring...
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4147535 |
Procedure for producing a suspension of a powdery substance and a reaction gas
A suspension of a powdery substance and a reaction gas is formed by allowing the powdery substance to fall as an annular flow into a reaction space, feeding the reaction gas downwardly to encircle...
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4108635 |
Solder skimmings recovery process
An improvement in the method for recovering marketable values of solder, lead, and a zinc chloride-ammonium chloride solution from solder skimmings which comprises grinding the skimmings, water...
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4076521 |
Method for continuously blowing materials into molten slags
A metallurgical method and apparatus; air is continuously blown into a mixture of agglomerates of lead concentrates and carbonaceous fuel in a shaft furnace. The resulting slag is delivered from...
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4072503 |
Thermal treatment of leaching residue from hydrometallurgical zinc production
Pyrometallurgical process for recovering lead, zinc and precious metals from leaching residues and precipitates occuring during the hydrometallurgical production of zinc, comprising a weak...
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4058396 |
Recovery of lead from batteries
Lead is recovered from batteries by contacting comminuted batteries with a molten alkali metal salt, reducing lead compounds to lead, separating molten lead from the molten salt, and transferring...
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4032328 |
Metal reduction process
An improved metal reduction process permits the efficient production of metal from reducible metal compounds by means of reducing metal. Broadly, the invention relates to conducting the reaction...
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4017308 |
Smelting and reduction of oxidic and sulphated lead material
Processes are provided for the recovering of crude lead from materials containing lead substantially in the form of oxides and/or sulphates. The processes are carried out in a rotary converter with...
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4013456 |
Method for treating flue dust containing lead
A method for pretreating of flue dust having a content of lead therein, by which method the flue dust is fused at a relatively low temperature without any substantial reduction taking place,...
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3950267 |
Process for producing activated carbon
High quality activated carbon is produced by charging a mixture of an organic material such as wood, anthracite coal, brown coal, coconut husk, and a material containing metal oxide, metal...
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3891428 |
Method for treating non-ferrous metal slag
A method of treating non-ferrous slag in a furnace by injecting liquid fuel and air into molten slag to heat and reduce the slag. The injection of the liquid fuel and air is obtained by discharging...
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3793004 |
METHOD FOR TREATING ZINC CADMIUM LEAD AND TIN DROSS
Drossing fluxes for zinc, lead or tin comprise a salt of a sulphur or phosphorus acid which contains hydrogen in the anion, and either an alkali metal chloride or an alkaline earth metal chloride.
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3547624 |
METHOD OF PROCESSING METAL-BEARING CHARGE IN A FURNACE HAVING OXY-FUEL BURNERS IN FURNACE TUYERES
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3524743 |
METHOD OF PROCESSING FLY DUSTS CONTAINING SULPHUR,AND SMELTER MIXED OXIDES OR OTHER MIXED OXIDES CONTAINING ZINC AND LEAD
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3452069 |
PROCESS FOR MANUFACTURE OF TETRAALKYLLEAD AND RECLAMATION OF BY-PRODUCT LEAD
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