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6696037 |
Method of recovering sulfur from minerals and other sulfur-containing compounds
A sulfurous compound such as a sulfur-rich “float” (concentrate) obtained by flotation of the residue from the leaching of a zinc concentrate is heated at a temperature not lower than the mel...
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6334991 |
Purification of sulfur by means of centrifugation
A sulfur purification process is provided. Ash-containing molten sulfur is fed to a centrifuge and subjected to centrifugation under controlled conditions at G forces at least about 4,000 times...
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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...
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5188713 |
Process for recovery of metal
A process for recovery of metal from a feedstock comprising copper is provided. The process comprises the steps of: (a) contacting the feedstock with an aqueous mixture comprising ammonium nitrate...
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5176802 |
Treatment of copper sulfide concentrates
A hydrometallurgical method is provided for recovering copper from particulate copper sulfide flotation concentrate containing at least about 20% copper by weight as cuprous and cupric sulfide, a...
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4923482 |
Process for separating sulfur from ore
An improved process for separating sulfur from low grade surface ore is disclosed. The process involves mixing small particles of sulfur ore with a dilute aqueous solution of an agent to form a...
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4824656 |
Method of recovering sulfur from solid catalysts
A method for recovering sulfur from a solid sulfur-containing catalyst is disclosed which comprises contacting the catalyst with liquid anhydrous ammonia in order to leach the sulfur out of the...
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4816225 |
Apparatus for the purification of contaminated sulfur
Impurities are removed from pieces of sulfur by dropping the pieces directly into a bath of heated liquid sulfur disposed in a vessel. The liquid sulfur is heated externally of the vessel and...
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4729888 |
Process of recovery of sulphur from minerals containing pyrites
Production of elementary sulphur from an iron sulphide mineral, which comprises oxidizing acid lixiviation of the pulverized mineral, for extraction of the sulfur. The pulp obtained from the...
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4726937 |
Recovery of nickel chloride and sulfur from waste products
Waste containing sulfur and nickel sulfide is heated to volatilize sulfur and reacted with hydrogen chloride to form nickel chloride.
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4722832 |
Sulfur recovery process
A process for the recovery of sulfur from sulfur-bearing ores employing an aqueous leaching solution containing calcium monosulfide, calcium hydrosulfide or mixtures of such calcium sulfide...
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RE32454 |
Process for desulfurization of coal and ores
A continuous process of desulfurizing coal and other ores contaminated with sulfur and recovering the sulfur in relatively pure crystal form, the process for coal including the steps of crushing...
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4557905 |
Leaching and washing a flocculated slurry having a fiber content
Particlized mineral material, such as gold ore, silver ore, or coal, is subjected to a leaching process in a manner to maximize treatment effectiveness even when the particlized mineral material...
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4391608 |
Process for the beneficiation of carbonous materials with the aid of ultrasound
A process for reducing the sulfur and ash content of coal and the like by treatment in an aqueous slurry with ultrasound followed by subsequent separating steps.
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4364774 |
Sulphur pelletizing
Process for pelletizing sulphur by forming and solidifying molten droplets of sulphur containing dispersed therewithin an effective minor amount of a mechanical strength improving modifying...
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4203727 |
Process for reducing the sulfur content of coal
Raw coal containing sulfur impurities and water is ground in a vapor-tight extraction zone in contact with a combustible sulfur solvent at an elevated temperature. An extraction mixture slurry is...
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3949051 |
Hydrometallurgical process for extracting copper from chalcopyrite or bornite concentrates
A process for extracting copper from a copper-containing concentrate by comminuting the concentrate in the presence of a liquid dispersing agent which inhibits agglomeration and forms a pulp, and...
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3939256 |
Sulfur recovery process
A method for the separation and recovery of elemental sulfur from mixtures of foreign material and sulfur which comprises washing the foreign material and sulfur mixture to remove impurities which...
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3647398 |
PROCESS FOR REMOVING GANGUE FROM SULFUR-BEARING MATERIALS
A process for removing gangue from sulfur-bearing materials, such as silica from sulfur ores or concentrates, includes melting the sulfur-bearing material having the gangue in the molten sulfur...
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3619147 |
SULFUR EXTRACTION IN PRESENCE OF AN ALKALINE MATERIAL AND INCLUDING WATER SEPARATION, SOLVENT RECYCLE AND DRY SEAL VAPOR LOCK
This invention relates to a process and apparatus wherein a solvent for dissolving and recovering sulfur from sulfur bearing ore or concentrate may be continuously recycled and reused without loss....
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3607143 |
SULFUR EXTRACTION BY SEQUENTIAL CONTACT WITH VAPOR AND WITH LIQUID PERCHLOROETHYLENE
This patent describes a process for the recovery and purification of sulfur which comprises contacting a sulfur-bearing ore with hot perchloroethylene vapor, permitting at least some of said vapor...
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3551333 |
SURFACE SULFUR RECOVERY
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3531261 |
SULFUR ORE REFINING PROCESS
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3556728 |
SULFUR EXTRACTION PROCESS
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3780167 |
PROCESS FOR SOLVENT EXTRACTION OF ORES
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3578418 |
SULFUR EXTRACTION USING HALOGENATED HYDROCARBONS INCLUDING WASHING THE RECOVERED SULFUR WITH METHANOL,ACETONE,OR ETHYLENE GLYCOL
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3438734 |
SULFUR PRODUCTION USING CARBON OXIDE REGENERANT
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3102792 |
Recovery of sulfur from native ores
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3093457 |
Recovery of elemental sulfur from its ores
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2934414 |
Extraction of sulphur
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2897065 |
Recovery of elemental sulfur from sulfur bearing solid mineral matter
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2890941 |
Sulfur extraction process
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2877100 |
Sulphur recovery
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2841536 |
Process for recovery of sulfur from elemental-sulfur bearing ore
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2838391 |
Method of treating sulfur bearing mineral values with molten sulfur to concentrate mineral sulfides
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2806770 |
Continuous solvent extraction method and apparatus
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