EP 0040519 A1 19811125 - Washbox for separating materials, and a method of separating coal from shale.
Title (en)
Washbox for separating materials, and a method of separating coal from shale.
Title (de)
Setzmaschine zum Trennen von Material und Verfahren zum Trennen von Kohle und Schiefer.
Title (fr)
Bac à pistonnage pour la séparation de matériaux et procédé pour séparer le charbon du schiste.
Publication
Application
Priority
GB 8016117 A 19800515
Abstract (en)
A wash-box for separating materials of different densities (e.g. coal and shale) comprises a stratification compartment (8), a perforate grid plate (12) extending across an upper part of the stratification compartment, and means (20, 22) by which water is admitted to the wash-box. The wash-box comprises a compression chamber (10) in underwater communication with the stratification compartment, and pressure applying means (14, 16, 18, 19) operative alternately to pressurise and de-pressurise the compression chamber (10), to cause repeated rising and falling of movement of water in the stratification compartment, to stratify raw material on the grid plate (12). The wash-box comprises a control device (24), comprising a pressure transducer (26) operative to measure the pressure pertaining in the compression chamber (10), in particular the average pressure pertaining in the compression chamber over a complete cycle of rising and falling movement of the water in the stratification compartment, and to produce a control signal dependent upon such measurement. The control signal is compared with a preset value, and the difference between the control signal and said preset value is utilised to determine the rate of admission of water to the wash-box, by actuation of a valve (22).
IPC 1-7
IPC 8 full level
B03B 5/24 (2006.01)
CPC (source: EP)
B03B 5/24 (2013.01)
Citation (search report)
- US 4176749 A 19791204 - CRAVEN GEOFFREY F [GB], et al
- FR 2392720 A1 19781229 - NORTON HARTY COLLIERY ENG LTD [GB]
- DE 2539374 A1 19770310 - KLOECKNER HUMBOLDT DEUTZ AG
- US 4019981 A 19770426 - STERN HANNS, et al
- GB 811460 A 19590408 - AUTOMATIC COAL CLEANING COMPAN
- GB 1084581 A 19670927 - SCHUCHTERMANN & KREMER BAUM AG
- FR 1408196 A 19650813 - STAMICARBON
- GB 453784 A 19360918 - INT COMB LTD, et al
- GB 991535 A 19650512 - WESTFALIA DINNENDAHL
Designated contracting state (EPC)
AT BE CH DE FR IT NL SE
DOCDB simple family (publication)
EP 0040519 A1 19811125; EP 0040519 B1 19860416; AT E19209 T1 19860515; DE 3174384 D1 19860522
DOCDB simple family (application)
EP 81302159 A 19810515; AT 81302159 T 19810515; DE 3174384 T 19810515