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Title: Method for beneficiating coal ore

Abstract

A new heavy liquid parting medium comprising an emulsion of water and a substantially water immiscible heavy parting liquid for use in beneficiating ores by gravity separations such as sink -float processes. The specific gravity of the emulsion parting medium can be adjusted by proportioning the relative amounts of water and the substantially water immiscible heavy liquid. Asmined coal is beneficiated using a water-trichlorofluoromethane emulsion as the parting medium in a sink-float separation process.

Inventors:
Publication Date:
OSTI Identifier:
6335666
Patent Number(s):
US 4376700
Assignee:
Bethlehem Steel Corp EDB-83-081244
Resource Type:
Patent
Resource Relation:
Patent File Date: Filed date 7 Oct 1980; Other Information: PAT-APPL-194742
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; COAL; SEPARATION PROCESSES; COMMINUTION; DENSITY; GRAVITATION; CARBONACEOUS MATERIALS; ENERGY SOURCES; FOSSIL FUELS; FUELS; MATERIALS; PHYSICAL PROPERTIES; 010400* - Coal, Lignite, & Peat- Processing

Citation Formats

Irons, S.D. Method for beneficiating coal ore. United States: N. p., 1983. Web.
Irons, S.D. Method for beneficiating coal ore. United States.
Irons, S.D. Tue . "Method for beneficiating coal ore". United States. doi:.
@article{osti_6335666,
title = {Method for beneficiating coal ore},
author = {Irons, S.D.},
abstractNote = {A new heavy liquid parting medium comprising an emulsion of water and a substantially water immiscible heavy parting liquid for use in beneficiating ores by gravity separations such as sink -float processes. The specific gravity of the emulsion parting medium can be adjusted by proportioning the relative amounts of water and the substantially water immiscible heavy liquid. Asmined coal is beneficiated using a water-trichlorofluoromethane emulsion as the parting medium in a sink-float separation process.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Mar 15 00:00:00 EST 1983},
month = {Tue Mar 15 00:00:00 EST 1983}
}
  • A method and apparatus for beneficiating a mixture of coal and a denser material are provided. The coal and ash mixture and a liquid medium are deposited into a rotating, sloping barrel having internal spiral flights and foraminous end sections. Coal and medium travel downwardly and the denser material is screwed upwardly. The positions of deposit of the mixture and the medium are adjustable, as are the rates of rotation of the barrel and the angle of the barrel.
  • A process for reducing the sulfur and ash content of coal is provided. The process involves cleaning the coal of debris and pulverizing it. The pulverized coal is contacted with a reagent selected from the group consisting of aqueous solutions of active nitrogen containing compounds, aqueous solutions of organic compounds containing at least one hydroxyl group, surfactants containing active ammonium groups and combinations thereof. The coal is washed with water and dried.
  • This patent describes a method for the separation of iron pyrite from a pulverized mineral ore comprising iron pyrites as a first constituent and a second constituent selected from the group consisting of coal and non-ferrous metal ores by air froth flotation of an aqueous pulp of the pulverized mineral ore. The improvement comprises incorporating in the pulp from about 0.02 to about 1 pound per ton of mineral of a composition comprising hydroxyacetic acid, xanthan gum, sodium silicate, and water wherein the acid content of the composition is from about 0.1 to about 69 percent by weight of themore » composition, the xanthan gum is from about 0.01 to about 10 percent by weight of the composition; and the ratio by weight of sodium silicate to hydroxyacetic acid is in the range of from about 0 to about 0.5.« less
  • A method of forming a liquefied coal product having a lower sulfur percent by weight than the solid coal from which it is derived comprises the steps as follows: (a) providing solid coal having a sulfur percent by weight of a particle size less than about 14 Tyler mesh, (b) providing calcium oxide of a particle size less than about 40 Tyler mesh, (c) mixing said solid coal and said calcium oxide with liquefaction solvent to form a liquefaction mixture, (d) hydrogenating and heating said liquefaction mixture to at least about 750/sup 0/ F. forming a liquefied coal product havingmore » residual coal solids and calcium sulfide solids, said liquefied coal product having a liquefied coal product sulfur percent by weight, which is less than said solid coal sulfur percent by weight.« less
  • A coal slurry containing 10-60% solids by weight is optionally first coarsely ground to about 20-80 mesh. Contaminant matter released thereby, may be separated by conventional means such as froth flotation which would eliminate a large proportion of the ash which is energy consuming as well as abrasive in nature. The ''clean slurry'' would now have water added back and would be further ground to about 100-300 mesh particle size and would then be cavitated by sonic energy making the particle size even smaller and freeing any remaining contaminants including iron pyrites and ash. To this, a mixture of oilmore » is added and the coal, oil mixture is then sonified during which process spherical agglomeration of the coal and oil occurs. The agglomerate and water mixture is screened to separate out most of the water leaving behind about 10-40% water in the coal, during which process the contaminants are also discharged with the water. The spherical agglomerates are mixed with a balance of oil to about 6 times the weight of the coal to produce a stable thixatrop fuel with excellent pipe travel characteristics due to a migration of a thin film of water to the boundry layer between the bore of the pipe and the fuel. The process including the sonification steps is also useful generally in the separation of solids by agglomeration.« less