US3760942A - Method for cleaning coal - Google Patents

Method for cleaning coal Download PDF

Info

Publication number
US3760942A
US3760942A US00074986A US3760942DA US3760942A US 3760942 A US3760942 A US 3760942A US 00074986 A US00074986 A US 00074986A US 3760942D A US3760942D A US 3760942DA US 3760942 A US3760942 A US 3760942A
Authority
US
United States
Prior art keywords
jigging
coal
shale
fine
cascaded
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.)
Expired - Lifetime
Application number
US00074986A
Other languages
English (en)
Inventor
D Bartelt
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.)
RAG AG
Original Assignee
Ruhrkohle AG
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
Priority claimed from DE19691949655 external-priority patent/DE1949655C3/de
Application filed by Ruhrkohle AG filed Critical Ruhrkohle AG
Application granted granted Critical
Publication of US3760942A publication Critical patent/US3760942A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
    • 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
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B9/00—General arrangement of separating plant, e.g. flow sheets
    • B03B9/005—General arrangement of separating plant, e.g. flow sheets specially adapted for coal

Definitions

  • the present invention relates to a method for cleaning coal that is still comingled with shaleetc. and is to' be washed.
  • the grain or particle size of the raw material may cover a range of (dust) to 80 mm, 0 to 150 or even up to 0 to 250 mm.
  • coarse and fine coal as intermingled is processed together by this method, which is also known as Baums" jigging method.
  • the separation process involved in this (or any other relevant) method refers to separation of the coal from the shale, resulting in at least two products accordingly. First, there is the washed coal having relatively low (specific) weight and which is being extracted from the jig through overflow. Second, there is the relatively heavy waste (shale), essentially comprised of rocks etc. and being extracted separatelyfrom the jig.
  • the jig includes a screen having quite small size apertures or gaps, and by adding water from below the screen, only small quantities of fine grain and dust components (coal and shale) is caused to pass the screen plate and added to the coarse, heavy weight waste.
  • the jig has to be adjusted in accordance with average grain size of all of the raw material as charged, so that jigging is not optimized for different sub-ranges of grain and particle size within the total range of particle sizes involved.
  • this method has two significant disadvantages which heretofore have been deemed inevitable and,.therefore, unavoidable. These disadvantages are:
  • the effective separation density increases progressively for lower grain size sub-ranges.
  • the separation density for products within a sub-range grain size of 150 to 80 mm may be about 1.45 grams per cm", for a sub-range of 3 to 0.5 mm the separation density is about 1.9 grams per cm, due to compacting.
  • the degree of separation i.e., the quality of the separation process for separating coal from shale is quite poor for particle sizes of the small value subranges because jigging is adapted to all (i.e., the average) grain sizes and not just to the fine grain components.
  • coarse and fine heavy waste as discharged from the jig, is screened to remove coarse waste and the remaining fine grain material as passing through the screen is retreated, i.e., washed again, for example, in a second stage jig, for separation of fine coal from fine shale, to be extracted and used separately.
  • the invention avoids the disadvantages of the known methods as outlined above.
  • coal and waste (rocks) as separated from each other have respectively higher purity, i.e., the degree of separation is enhenced, and the resulting middlings are at least equivalent in quality to those resulting from the known processes.
  • the large, size coal pieces are treated rather carefully, as throughout the separation and cleaning process they are embedded in fine grain material.
  • plural product production and multi stage jigging may be used in the first washing step.
  • Substantial portions of fine grain heavy waste are preferably extracted by some of the cascaded and staggeredly arranged screens only. Wateris not to be charged into the jig from below the screens, because of the second stage washing, accommodating particularly small particles sizes. This, in turn, facilitates extraction of fine waste. Also, the total water consumption is considerably reduced.
  • at least one of the screens in the jig is to have relative large size apertures so that some control is exercised upon the passage rate of fine grain heavy waste, the size selection being made in dependence upon the composition of the raw product.
  • FIGURE shows somewhat schematically a diagram for equipment used for practicing the preferre embodiment of the inventive method.
  • the un-screened coal to be washed is fed along charge path 1 to ajig 2 for jigging therein.
  • the jig 2 has three essentially serially operating, shale discharge and extraction units for respectively providing three different output products.
  • Jigging units which can be used here are known per se and described, for example, by
  • a hutch 3 of the wash box is positioned closest to the inlet of the jig and collects some of the clean waste. Coarse shale enters hutch 3 via a discharge and coarse shale extractor 3b. Still closer to jig inlet, is a screen plate 30. However, the aperture dimensions of screen plate 3a are relatively small, so that only small quantities of fine grain material is accumulated in hutch 3. Clean waste accumulates in hutch 3 and is extracted therefrom through a discharge 30 to be accumulated in storage bin 18.
  • the second and third waste extraction stages include hutches 4 and 5 respectively, and fine heavy waste components are extracted from jig 2 predominantly through screens plates 4a and 5a. Screens 4a and 5a have relative wide apertures so that the passage rate of the fine, heavy waste is relatively large. As water is not flushed into the hutches from below, considerable quantities of fine coal still pass screens 4a and 5a. Coarse waste is extracted by large particle extractor devices 4b and SD for collection in hutches 4 and 5.
  • clean coal is withdrawn from the jig 2 via overflow 6 path and charges a clean coal bin 20.
  • the shale extraction devices 3b, 4b and 5b are shown schematically as bucket wheel sluiceways. However, one could use other known large particle extractors, such as slide extractors or swing bed extractors. It is of particular advantage to select settling (jigging) conditions so that the layers on top of screens 40 and 5a remain relatively thin. This way, fine particles are'indeed brought into close proximity to the screens proper and the fine shale will pass through the jigging screens and will not be extracted along overflow 6. A low level height of the heavy shale products on top of the screens is subject to control using isotope sensing techniques.
  • the processing capacity of jig 13 can be kept considerably smaller than the corresponding capacity of jig 2.
  • Jig 13 is additionally charged via path 12 with a product permitted to pass a classifying screen 8 that separates coarse waste from fine waste as jointly discharged from hutch 5 via outlet 5c.
  • the coarse product is extracted from screen 8 via an overflow path 10 leading to a bin 19 for middings.
  • the smaller jig 13 re-sorts and washes the fine heavy product as extracted from units 4 and 5 via screens 7 and 8.
  • a first settling hutch l4 collects fine shale to be fed also to clean shale bin 18. From the second hutch 15 medium grade products are extracted and fed to bin 19. Fine coal is extracted from jig 13 via overflow path 16 and fed to clean coal bin 20.
  • the re-washing or second stage jigging may be carried out in a relatively small jig 13. However, it can also be carried out in heavy liquid. Selection of separation size and grading depends upon further utilization of the final product.
  • the bins l8, l9 and 20 represent merely final destinations of the products after their separation in accordance with the invention. All of such storage may not be needed; instead, these respective products may be passed immediately and directly into further processing equipment. This is particularly true for the washed and clean coal.
  • Method of cleaning coal comprising the steps of:
  • jigging an unscreened coal-shale mixture in a multistage jig for extraction of coal through overflow therefrom by means of cascaded jigging, including a first jigging step wherein said shale and coal are stratified on a screen having relatively small apertures to thereby allow fine particles to pass through, and wherein coarse shale is separately extracted from the stratified coal and shale and combined with the fine particles that passed through the screen; the cascaded jigging further including a second jigging step wherein shale and coal as overflowing q during and pursuant to the first jigging step is also stratified on a screen having wider apertures than the screen used in the first jigging step, and wherein coarse shale is also separately extracted from the stratified coal and shale and combined with the fine particles that passed through the screen used in the second jigging step; feeding the overflow from the second jigging step as containing coarse coal to

Landscapes

  • Solid Fuels And Fuel-Associated Substances (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
  • Combined Means For Separation Of Solids (AREA)
US00074986A 1969-09-26 1970-09-24 Method for cleaning coal Expired - Lifetime US3760942A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691949655 DE1949655C3 (de) 1969-09-26 Verfahren zur Aufbereitung von Steinkohle

Publications (1)

Publication Number Publication Date
US3760942A true US3760942A (en) 1973-09-25

Family

ID=5747099

Family Applications (1)

Application Number Title Priority Date Filing Date
US00074986A Expired - Lifetime US3760942A (en) 1969-09-26 1970-09-24 Method for cleaning coal

Country Status (5)

Country Link
US (1) US3760942A (enExample)
JP (1) JPS4945127B1 (enExample)
CA (1) CA936131A (enExample)
GB (1) GB1331296A (enExample)
ZA (1) ZA706429B (enExample)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2171145C1 (ru) * 2000-07-20 2001-07-27 Открытое акционерное общество "Михайловский ГОК" Способ обогащения руд и линия для его осуществления
CN105126994A (zh) * 2014-03-10 2015-12-09 衢州市易凡设计有限公司 一种针对高灰高泥高矸石煤的洗选设备
CN109746115A (zh) * 2019-02-01 2019-05-14 中国矿业大学 一种焦肥煤的中煤连生体多段解离-机柱联合再选工艺

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52109235U (enExample) * 1976-02-17 1977-08-19
JPS5430343U (enExample) * 1977-08-03 1979-02-28
CN106140455A (zh) * 2016-06-28 2016-11-23 陕西陕煤黄陵矿业有限公司 一种选煤厂末端故障连续选煤辅助系统及方法

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB190323259A (en) * 1903-10-27 1904-08-25 Carl Joseph Kremer Process of and Apparatus for Simultaneously Washing and Assorting Coal and the like.
US1082102A (en) * 1912-09-04 1913-12-23 Christian Simon Coal-jigger.
DE345238C (de) * 1920-01-08 1921-12-07 Christian Simon Verfahren und Vorrichtung zur Verbesserung der Wirkung von Steinbett-Setzmaschinen
US2550829A (en) * 1949-03-04 1951-05-01 Int Minerals & Chem Corp Mineral recovery process
US2764287A (en) * 1951-07-13 1956-09-25 Link Belt Co Treatments of materials in fine particles, particularly carbonaceous slimes
GB758286A (en) * 1953-06-24 1956-10-03 Edmond Harvengt Method and apparatus for treating pyrite containing coals, particularly those containing large proportions of pyrites of small size
CA663719A (en) * 1963-05-28 T. Norton Aubrey Coal washing of the middle elevator baum type
US3252574A (en) * 1960-11-26 1966-05-24 Stamicarbon Method of and apparatus for separating particles of different specific gravity in a jig

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA663719A (en) * 1963-05-28 T. Norton Aubrey Coal washing of the middle elevator baum type
GB190323259A (en) * 1903-10-27 1904-08-25 Carl Joseph Kremer Process of and Apparatus for Simultaneously Washing and Assorting Coal and the like.
US1082102A (en) * 1912-09-04 1913-12-23 Christian Simon Coal-jigger.
DE345238C (de) * 1920-01-08 1921-12-07 Christian Simon Verfahren und Vorrichtung zur Verbesserung der Wirkung von Steinbett-Setzmaschinen
US2550829A (en) * 1949-03-04 1951-05-01 Int Minerals & Chem Corp Mineral recovery process
US2764287A (en) * 1951-07-13 1956-09-25 Link Belt Co Treatments of materials in fine particles, particularly carbonaceous slimes
GB758286A (en) * 1953-06-24 1956-10-03 Edmond Harvengt Method and apparatus for treating pyrite containing coals, particularly those containing large proportions of pyrites of small size
US3252574A (en) * 1960-11-26 1966-05-24 Stamicarbon Method of and apparatus for separating particles of different specific gravity in a jig

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2171145C1 (ru) * 2000-07-20 2001-07-27 Открытое акционерное общество "Михайловский ГОК" Способ обогащения руд и линия для его осуществления
CN105126994A (zh) * 2014-03-10 2015-12-09 衢州市易凡设计有限公司 一种针对高灰高泥高矸石煤的洗选设备
CN105344462A (zh) * 2014-03-10 2016-02-24 衢州市易凡设计有限公司 一种针对高灰高泥高矸石煤的洗选工艺
CN105126994B (zh) * 2014-03-10 2017-12-19 衢州市易凡设计有限公司 一种针对高灰高泥高矸石煤的洗选设备
CN109746115A (zh) * 2019-02-01 2019-05-14 中国矿业大学 一种焦肥煤的中煤连生体多段解离-机柱联合再选工艺
WO2020155648A1 (zh) * 2019-02-01 2020-08-06 中国矿业大学 一种焦肥煤的中煤连生体多段解离-机柱联合再选工艺

Also Published As

Publication number Publication date
ZA706429B (en) 1971-08-25
CA936131A (en) 1973-10-30
GB1331296A (en) 1973-09-26
DE1949655B2 (de) 1977-07-14
JPS4945127B1 (enExample) 1974-12-02
DE1949655A1 (de) 1971-04-01

Similar Documents

Publication Publication Date Title
US2932395A (en) Process of separating mixtures of particles
CA1118723A (en) Heavy magnetic media hydrocyclonic separation process with screening, magnetic separation and recycling of liquids
DE2809630A1 (de) Verfahren zur nassen verdichtung von feiner kohle
US4034861A (en) Process and installation for recovering usable materials from waste material containing metals and non metals
US5676710A (en) Coal preparation system
US3064806A (en) Apparatus for wet sizing of solid materials
EA037444B1 (ru) Уменьшение необходимости в хвостохранилищах при флотационном обогащении руд
CN110523524A (zh) 一种无烟煤全级入选简化分选工艺
US2690261A (en) Concentration of minerals
CN108296009B (zh) 煤炭深加工方法以及煤炭处理方法
US3794162A (en) Heavy medium beneficiating process
RU2055644C1 (ru) Установка для обогащения золотосодержащих россыпей
US4133747A (en) Method for processing raw coal
US4203831A (en) 6/30 Coal washing plant
US3760942A (en) Method for cleaning coal
US2656118A (en) Disposal of slime-bearing water
US2623637A (en) System of separation
US2151175A (en) Ore dressing
DE3833054A1 (de) Verfahren zur aufbereitung von teichschlamm (flotationsabgaengen) und aufbereitungsanlage
CN113560033B (zh) 一种智能煤炭脱粉洗选系统及方法
CN1210107C (zh) 煤泥重介质分选工艺
US2849113A (en) Methods of and means for handling flotation middlings in ore concentration processes
US3813298A (en) Dual screening process for separating starch particles and fibers
GB2108012A (en) Process for the thick-medium dynamic separation of mixtures of materials
AU743968B2 (en) Beneficiation of iron ore waste