Download presentation

Presentation is loading. Please wait.

Published byAlonzo Bendon Modified over 2 years ago

1
FLOTATION KINETICS A flotation model is similar to chemical kinetics dN/dt =-k 1 N 1 a - k 2 N 2 b N - species (1 and 2) concentration t- time k - rate constant(s) a, b – process order -negative sign indicates that the concentration is diminishing due to the loss of particles being floated. -exponents a and b signify the order of the process Since flotation seems to depend only on particles concentration dN/dt =-k 1 N 1 a

2
ModelRelation Classic first order = [1 – exp (–k 1 t)] Modified first order = {1 – 1/(k 2 t)[1 – exp (–k 2 t)]} For reactor with ideal mixing = [1 – 1/(1 + t/k 3 )]* Modified for gas–solid adsorption = k 4 t/(1 + k 4 t)* Kinetics of second order = ( ) 2 k 5 t/(1 + k 5 t) Modified second order = {1 – [ln (1 + k 6 t)]/(k 6 t)} Two rate constants = [1– { exp (–k 7 t) + (1 – ) exp(–k 8 t)} Distributed rate constants = [1 – exp(–kt) f (k, 0) dk] * Equivalent models because k 3 = 1/k 4. – flotation recovery after time t, – maximum recovery, – fraction of particles having lower flotation rate constant, k7, k – flotation rate constant. Flotation kinetics models

3
A. Bakalarz, J. Drzymala, 2013, Interrelation of the Fuerstenau upgrading curve parameters with kinetics of separation, Physicochemical Problem of Mineral Processing, 49(2), more

4
Flotation kinetics of the whole mass and components components (recovery vs time) Flotation results plotted as a relationship between recovery of each component in concentrate and separation time (a), yield of components forming concentrate vs. separation time (b) product (yield vs time) A. Bakalarz, J. Drzymala, 2013, Interrelation of the Fuerstenau upgrading curve parameters with kinetics of separation, Physicochemical Problem of Mineral Processing, 49(2),

5
relation between flotation kinetics and upgrading curves The kinetics of separation of feed components (a) provide separation results in the form of the Fuerstenau upgrading curve (b). A. Bakalarz, J. Drzymala, 2013, Interrelation of the Fuerstenau upgrading curve parameters with kinetics of separation, Physicochemical Problem of Mineral Processing, 49(2),

6
ugrading curves (here Fuerstenaus) equations based on kinetics of flotation c,1 recovery of component 1 in concentrate c,2 recovery of component 2 in concentrate

7
Theoretical shape of the separation data in the Fuerstenau plot *for a suitable equation see previous slide (more plots in A. Bakalarz, J. Drzymala, 2013, Interrelation of the Fuerstenau upgrading curve parameters with kinetics of separation, Physicochemical Problem of Mineral Processing, 49(2), * Remeber: for characterizing separation results we need either two parameter or a law governing separation and then you can use one parameter which can be called selectivity as in these plots selectivity k

8
An example of separation results approximation using the Fuerstenau plot Polish copper ore – lab tests with xanthate a=~1000 a=100 a=~110

9
Homework Calculate the rate constant and order of a set of yield flotation data

10
Microlaboratory cells Laboratory cells Laboratory machines Industrial machines MechanicalPneumo-mechanicalPneumatic Pressurized (DAF) Other (sparged hydrocyclone, ASH)

11

12

13
Other laboratory flotation devices a)cylindrical cell equipped with magnetic stirrer (Fuerstenau, 1964) b)laboratory flotation device of Partridge and Smith, 1971 Laboratory cells

14
Laboratory Mechanobr flotation machine

15
Laboratory Denver flotation machine

16
EIMCO Product Leaflets, 2000 Industrial flotation

17
Flotation machines are used individually and as a group (bank)

18
Svedala Product Handbook, 1996 Flotation machines are rectangular and circular

19
Constructions and impellers of flotation machines are different

20
(FLSmidth Minerals) and ) Comparison of pneumo-mechanical (FLSmidth Minerals) and mechnical flotation machines (WEMCO) ) XCELL Flotation Machines. FLSmidth Mineralss brochure pneumo-mechanical mechanical Mechanical (self air aspiration) Pneumo-mechanical (air is forced and mechanically dispersed Pneumatic (air is forced) Injection ( air and slurry go together) Pressurized (dissolved air flotation DAF) Other (air sparged hydrocyclone, ASH) injection pressurized

21
DenverMechanobr Fagergreen (WEMCO-EIMCO)

22
DENVER

23
Wemco-Fagergreen (V=0.085 ÷ 85m 3 ) Kelly E.G., Spottiswood D.J., Introduction to mineral processing. J.Wiley& Sons, N.Jork 1985

24
Wemco-Fagergreen (WEMCO-EIMCO) mechanical flotation machines EIMCO Product Leaflets, 2000

25
Denver Denver Agitair Agitair Metso RCS (Metso Minerals) Metso RCS (Metso Minerals) Outotec (Outokumpu) Outotec (Outokumpu) X-Cell (FLSmidth Minerals) X-Cell (FLSmidth Minerals) Humbolt-Wedag Humbolt-Wedag IMN Gliwice IMN Gliwice

26
Kelly E.G., Spottiswood D.J., Introduction to mineral processing. J.Wiley& Sons, N.Jork 1985 Industrial flotation machine (mechano-pneumatic, Agitair) Pressurized air froth product rotor rotors shaft

27
Maszyna flotacyjna mechaniczno-pneumatyczna AS (Svedala/Metso Minerals), V=0,21 ÷ 16 m 3 Svedala Product Handbook, 1996

28
Wills B.A., Mineral processing technology. Pergamon Press 1983 Fragment of mechano-pneumatic flotation machine (continueous, multi-impeller tankless Denver D-R

29
Pneumo-mechanic multi-tank (15m 3 each) (Aker FM – Humbold Wedag) Humbold-Wedag Product Leaflets, 1998 feed tailing

30
Maszyna jednowirnikowa Maszyna przepływowa wielowirnikowa Pneumo-mechanical flotation machines IMN

31
New machines: large volume and output, saving energy Flotation technologies. Outotec Leaflets 2007 Historyczny rozwój pojemności maszyn flotacyjnych

32
Outokumpu Oy Leaflets 2000 (Outokumpu OK-100, V= 100m 3 TankCell m 3 Flotation technologies, Outotec Oyj. Leaflets 2007

33
© 2012 Outotec Oyj. Outotec TankCell 500 (500m 3 )

34
RCS (Reactor Cell System) from 5 to 200 m 3 (Metso Minerals/Svedala) 1 -radial flow of slurry to tank wall 2 -primary slurry stream to benith impeller 3 -secondary recirculation towards upper part of tank Basics in mineral processing. Metso Minerals 2003

35
RCS (Reactor Cell System) from 5 to 200 m 3 (Metso Minerals) Basics in mineral processing. Metso Minerals 2003

36
RCS (Reactor Cell System) from 260 m 3 (Metso Minerals)

37
pneumo-machanic XCELL (FLSmidth Minerals) XCELL Flotation Machines. FLSmidth Mineralss brochure 2008.

38
FLOTATION COLUMNS Metso Metso Outotec (Outokumpu) Outotec (Outokumpu)

39

40
Jameson Cell Jameson Cell Imhoflot Imhoflot Pneuflot (Humbolt-Wedag) Pneuflot (Humbolt-Wedag)

41
Injection Jameson Cell

42

43
Pneumatic PNEUFLOT Pneumatic flotation with PNEUFLOT® cells HUMBOLDT WEDAG leaflet 2009

44
pneumatic PNEUFLOT

45
Injection Imhoflot 2 Distributor of air and suspennion Pneumatic cell Imhoflot. Maelgwyn Mineral Service leaflet 4/06 Chile 2006 feed air flotation froth middlings to recirculation concentrate product tailing

46

47
Pneumatic cell Imhoflot. Maelgwyn Mineral Service leaflet 4/06 Chile 2006 Multi-injection Imhoflot 3 (centrifugal flotation) concentrate tailing feed pump tailing pump feedreagents compressed air feed air plus suspension

48
Siemens SIMINE Hybrid Flot Metals and Mining, Siemens VAI, No. 1, 2011 Injection column

49
Dissolved air flotation (DAF)

50

51
Pressurized flotation (separation of coal from sulfides) Rodrigues & Rubio, International Journal Of Mineral Processing. V. 82, P. 1-13, FGR - Flocs Generator Reactor

52

53
Flotation, ZWR Polkowice

Similar presentations

© 2016 SlidePlayer.com Inc.

All rights reserved.

Ads by Google