[go: up one dir, main page]

EP0020275A1 - Verfahren zur Wiedergewinnung von Reinkohle durch Flotation - Google Patents

Verfahren zur Wiedergewinnung von Reinkohle durch Flotation Download PDF

Info

Publication number
EP0020275A1
EP0020275A1 EP80400775A EP80400775A EP0020275A1 EP 0020275 A1 EP0020275 A1 EP 0020275A1 EP 80400775 A EP80400775 A EP 80400775A EP 80400775 A EP80400775 A EP 80400775A EP 0020275 A1 EP0020275 A1 EP 0020275A1
Authority
EP
European Patent Office
Prior art keywords
coal
flotation
improving
recovery
clean coal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP80400775A
Other languages
English (en)
French (fr)
Inventor
Glen F. Snow
Hugh L. Bell
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Calgon Corp
Original Assignee
Calgon Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Calgon Corp filed Critical Calgon Corp
Publication of EP0020275A1 publication Critical patent/EP0020275A1/de
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/001—Flotation agents
    • B03D1/004—Organic compounds
    • B03D1/016—Macromolecular compounds
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G OR C10K; LIQUIFIED PETROLEUM GAS; USE OF ADDITIVES TO FUELS OR FIRES; FIRE-LIGHTERS
    • C10L9/00—Treating solid fuels to improve their combustion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D2203/00—Specified materials treated by the flotation agents; Specified applications
    • B03D2203/02—Ores
    • B03D2203/04—Non-sulfide ores
    • B03D2203/08—Coal ores, fly ash or soot

Definitions

  • Flotation processes have been used for some time in the coal industry to recover coal fines from previously discarded aqueous streams generated by processing raw coal.
  • the flotation feed consists of fine coal and clay which results from prior coarse separation steps such as baths, jigs, dewatering screens, sieve bends and cyclones.
  • the feed is normally 28 x 0 mesh and contains 4 to 12 percent solids.
  • the flotation circuit consists of four to eight cells in a single bank with the number of banks proportional to the total tonnage to be processed.
  • the concentrate produced in the flotation cells goes to a vacuum filter where it is concentrated to approximately 75 to 80 percent solids.
  • the tailings from the flotation process are discharged to a waste pond or a refuse vacuum filter.
  • the very fine clay that is in the circuit often becomes entrapped in and/or adsorbed on the coal being floated and increases the amount of ash in the final product.
  • the polymer may be added to the feed to the flotation circuit or to the individual cells by conventional feeding means and it is believed that it functions by flocculating the fine coal fraction.
  • the polymer may be used in dosages of between 0.025 and 1 pound per ton, preferably at least 0.05 pounds per ton, based on the weight of the dry flotation feed.
  • Suitable polymers which may be used in accordance with the teachings of this invention are water soluble, partially hydrolyzed polyacrylamides having a degree of hydrolysis of from 1 percent to 50 percent and a molecular weight of at least 50,000, and preferably at least 1,000,000.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)
EP80400775A 1979-06-01 1980-05-30 Verfahren zur Wiedergewinnung von Reinkohle durch Flotation Withdrawn EP0020275A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US4473679A 1979-06-01 1979-06-01
US44736 1979-06-01

Publications (1)

Publication Number Publication Date
EP0020275A1 true EP0020275A1 (de) 1980-12-10

Family

ID=21934041

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80400775A Withdrawn EP0020275A1 (de) 1979-06-01 1980-05-30 Verfahren zur Wiedergewinnung von Reinkohle durch Flotation

Country Status (2)

Country Link
EP (1) EP0020275A1 (de)
AU (1) AU5856080A (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2502028A1 (fr) * 1981-03-23 1982-09-24 American Cyanamid Co Procede pour diminuer l'aptitude a flotter des mineraux de type sylvinite dans un systeme de flottation, utilisant comme deprimant un copolymere de faible masse moleculaire
FR2525494A1 (fr) * 1982-04-26 1983-10-28 American Cyanamid Co Procede de concentration de la sylvite dans un systeme de flottation de minerai de sylvinite
US4533465A (en) * 1982-04-26 1985-08-06 American Cyanamid Company Low molecular weight copolymers as depressants in sylvinite ore flotation
EP0246105A3 (en) * 1986-05-14 1989-04-05 Fospur Limited Recovering coal fines
US4830740A (en) * 1988-04-19 1989-05-16 The Dow Chemical Company Pyrite depressants useful in the separation of pyrite from coal
US4857221A (en) * 1986-05-14 1989-08-15 Fospur Limited Recovering coal fines
US4859318A (en) * 1987-10-16 1989-08-22 Fospur Limited Recovering coal fines
US4956077A (en) * 1987-11-17 1990-09-11 Fospur Limited Froth flotation of mineral fines
US5402894A (en) * 1993-10-18 1995-04-04 Chemical Dewatering Technology, Inc. Coal conditioning process

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3717574A (en) * 1971-09-21 1973-02-20 American Cyanamid Co Flocculation of coal slimes
SU362568A1 (ru) * 1970-05-12 1973-09-17 ФЩ|ЛЧпН 1"Ofei^R! и ITj^г. М. Посыпайко, А. И. Ольферт, А. М. Яковенко, В. X. Конторович,и Череповецкий ордена Ленина металлургический завод
US4141691A (en) * 1977-12-12 1979-02-27 Calgon Corporation Use of water soluble polymers in coal flotation circuits
BE873001A (fr) * 1977-12-23 1979-06-22 American Cyanamid Co Procede de recuperation de charbon par flottation

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU362568A1 (ru) * 1970-05-12 1973-09-17 ФЩ|ЛЧпН 1"Ofei^R! и ITj^г. М. Посыпайко, А. И. Ольферт, А. М. Яковенко, В. X. Конторович,и Череповецкий ордена Ленина металлургический завод
US3717574A (en) * 1971-09-21 1973-02-20 American Cyanamid Co Flocculation of coal slimes
US4141691A (en) * 1977-12-12 1979-02-27 Calgon Corporation Use of water soluble polymers in coal flotation circuits
EP0002633A1 (de) * 1977-12-12 1979-06-27 Calgon Corporation Verwendung von wasserlöslichen Polymeren in Kohleflotationskreisläufen und Ausführungsverfahren
BE873001A (fr) * 1977-12-23 1979-06-22 American Cyanamid Co Procede de recuperation de charbon par flottation
GB2010702A (en) * 1977-12-23 1979-07-04 American Cyanamid Co Froth flotation of coal
DE2853410A1 (de) * 1977-12-23 1979-07-05 American Cyanamid Co Verfahren zur kohleaufbereitung durch flotation
FR2412350A1 (fr) * 1977-12-23 1979-07-20 American Cyanamid Co Procede de recuperation de charbon par flottation

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
CHEMICAL ABSTRACTS, Vol. 74, Nr. 26, 1971, page 142, Abstract 144265r. Columbus, Ohio, USA KAL'CHENKO, D.A. et al. "Improvement in the water slurry scheme of a coal concentrating mill". & Koks Khim. 1971 (4), 11-12. * Whole Abstract * *
CHEMICAL ABSTRACTS, Vol. 83, Nr. 18, 1975, page 178, Abstract 150081e. Columbus, Ohio. USA BIMBEREKOV, A. "Mechanism of the reaction between 47% hydrolysed polyacrylamide and coal flotation residues". & Vopr. Obogashch. Polezn. Iskop. Sib. 1974, 71-80. * Whole Abstract * *

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2502028A1 (fr) * 1981-03-23 1982-09-24 American Cyanamid Co Procede pour diminuer l'aptitude a flotter des mineraux de type sylvinite dans un systeme de flottation, utilisant comme deprimant un copolymere de faible masse moleculaire
FR2525494A1 (fr) * 1982-04-26 1983-10-28 American Cyanamid Co Procede de concentration de la sylvite dans un systeme de flottation de minerai de sylvinite
US4533465A (en) * 1982-04-26 1985-08-06 American Cyanamid Company Low molecular weight copolymers as depressants in sylvinite ore flotation
EP0246105A3 (en) * 1986-05-14 1989-04-05 Fospur Limited Recovering coal fines
US4857221A (en) * 1986-05-14 1989-08-15 Fospur Limited Recovering coal fines
US4859318A (en) * 1987-10-16 1989-08-22 Fospur Limited Recovering coal fines
US4956077A (en) * 1987-11-17 1990-09-11 Fospur Limited Froth flotation of mineral fines
US5051199A (en) * 1987-11-17 1991-09-24 Fospur Limited Froth flotation of mineral fines
US4830740A (en) * 1988-04-19 1989-05-16 The Dow Chemical Company Pyrite depressants useful in the separation of pyrite from coal
WO1989010200A1 (en) * 1988-04-19 1989-11-02 The Dow Chemical Company Pyrite depressants useful in the separation of pyrite from coal
EP0338778A3 (de) * 1988-04-19 1991-01-16 The Dow Chemical Company Pyritabscheider, verwendbar für die Abtrennung von Pyrit aus Kohle
US5402894A (en) * 1993-10-18 1995-04-04 Chemical Dewatering Technology, Inc. Coal conditioning process

Also Published As

Publication number Publication date
AU5856080A (en) 1980-12-04

Similar Documents

Publication Publication Date Title
US4141691A (en) Use of water soluble polymers in coal flotation circuits
US4857221A (en) Recovering coal fines
US4877517A (en) Depressant for flotation separation of polymetallic sulphidic ores
JPH0260714B2 (de)
US4140628A (en) Dense medium separation
EP0020275A1 (de) Verfahren zur Wiedergewinnung von Reinkohle durch Flotation
US3805951A (en) Selective flocculation and flotation of slimes from sylvinite ores
HK45683A (en) Process for the preparation of coal-containing sludge pellets valuable as fertilizer and fuel
US4416768A (en) Ore beneficiation
US5693692A (en) Depressant for flotation separation of polymetallic sulphide ores
CN113210133A (zh) 一种三次浮游选煤工艺
US4859318A (en) Recovering coal fines
CA1209345A (en) Method for treating blast furnace gas and apparatus for carrying out that method
CN113631739B (zh) 铬铁矿细料的回收
EP0246105B1 (de) Feinkohlegewinnung
US2831574A (en) Beneficiation of low grade magnesite ores
RU2428258C2 (ru) Способ обогащения угольных шламов
US2885078A (en) Flotation of mica from silt deposits
US3859207A (en) Flotation of aluminosilicate, phosphate and fluoride ores
US2506301A (en) Recovery of resins from coal
US3424308A (en) Recovery of clay and sand from an ore
US2633240A (en) Beneficiation of coal by flotation
US3009570A (en) Process for eliminating clay slimes from mica
RU1776202C (ru) Способ механического отделени металлов от шлака металлургических печей
US2330158A (en) Concentration of potash ores

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LU NL SE

ITCL It: translation for ep claims filed

Representative=s name: SOCIETA' ITALIANA BREVETTI S.P.A.

17P Request for examination filed

Effective date: 19810513

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19820924

RIN1 Information on inventor provided before grant (corrected)

Inventor name: BELL, HUGH L.

Inventor name: SNOW, GLEN F.