Warman Brochure

WARMAN® Centrifugal Slurry Pumps

Excellent Minerals Solutions

CARS Continuous Air Removal System

Introducing the next generation in froth pumping from Weir Minerals, the Warman® horizontal froth pump featuring CARS (continuous air removal system) Adding innovative technology to the proven line of Warman® heavy duty froth pumps, the new continuous air removal system (CARS) is designed to separate and remove gas in tenacious froth applications to enable more efficient pumping. Retrofittable with our current Warman® family of froth pumps, CARS allows for an easy, cost-effective upgrade for your operation. Features and benefits •

No air-locking at the impeller eye

•

Excellent performance on abrasive mineral froth slurry with Froth Volume Factor up to 4.0

•

Stable performance proven in extreme froth conditions on site tests - no need for additional Froth Volume Factor reduction

•

No product loss due to sump overflow and CARS® venting back to suction tank

•

Froth Volume Factor variations in flotation process are balanced by CARS venting

•

No more restrictions to flotation process upgrade requiring increased Froth Volume Factor

•

Superior pump efficiency than the competition allowing smaller motor size

•

CARS upgrade available on popular Warman® AHF, LF, MF horizontal froth pumps

Weir Minerals takes the frustration out of froth and high viscosity applications with the continuous air removal system (CARS) pumping. Highly aerated mixtures The technique of separating gas from highly aerated mixtures by venting through the impeller back shroud has been used in paper stock pumps since the 1980’s. More recently, the same approach has been applied to pumps handling mineral froths. Froths with abrasive solids In the liberation of minerals from ore, the minerals are often floated through the use of flotation agents. Air bubbles carry the particles of a mineral to be recovered and further processed. It is not unusual for mineral froth to be a three-phase or even four-phase fluid containing water, solids, air and froth. Some mineral froths are brittle and break down easily, while others are retentive or tenacious. Pumping highly aerated, brittle froths is somewhat similar to paper stock handling. It can be successfully performed by a single stage pump equipped with a semiopen impeller incorporating back expelling vanes, back shroud vent holes and a vented gas collection chamber installed behind the impeller. Tenacious froth requires additional means to assist in removing the lighter aerated fraction.

Primary means of gas evacuation assistance in other gaseous mixtures handling pumps used to be a vacuum pump, either incorporated on the same shaft in the gas collecting chamber or connected to the venting pipe separately. However, with abrasive solid particles present, the vacuum pumps with their tight internal clearances do not work. Excellent performance on abrasive mineral froth slurry and available for popular Warman® froth pumps The Warman® advanced centrifugal froth pump with CARS is designed to handle separation and removal of gas in a two-stage process. In the first stage, the flow inducer blade of the Warman® froth pump impeller promotes movement of the froth slurry into the impeller eye, while imposing pre-rotation for initial separation of high gas containing fraction towards the center of the inlet and towards vent holes located on the impeller back shroud. A secondary inducer is shaft mounted and located behind the impeller in the gas collection chamber. In the second stage of the process, the secondary inducer promotes axial movement of the gas containing mixture out the chamber vent, while at the same time rotating the mixture inside the chamber for additional separation of solids back to the process by the centrifugal action of main impeller back vanes. This arrangement has no reliance on tight running clearances. All wetted parts are made of wear resistant materials for problem free handling of abrasive solid particles.

1. CARS venting pipe fitted on back side of Warman® AHF froth pump during site test 2. The impeller of the Warman® AHF pump with CARS

1.

2.

CARS components Impeller Frame plate liner insert

Expeller chamber

Flow inducer

Gland seal ring

Seal guard

AH_ LF_ MF

Power Consumption Comparison

Warman AHF/LF/MF pump Quick Selection Chart* ®

Cubic meters per hour (m3/hr) 220

20

50

70

100

150

200

300

500

700

1,000

2,000

3,000

5,000

7,000

65

Pump A

6AHF

200

Warman® AHF froth pump

4AHF

180 160

8AHF

2AHF 3AHF

55

300LF 350LF 450LF

45

50

120

40 35

550LF 100

30

80

25 20

60

15 40 10

250MF 20

5

0 100

Flowrate, m3h

2

3

4

5 6 7 89 1,000

2

3

4

5 6 7 89 10,000

2

3

4

US gallons per minute (gpm) *Lower light blue areas: recommended maximum operating range on aerated slurries

0

Total head (meters)

Total head (feet)

12AHF 14AHF

200MF

140

Power, KW

60

10AHF

WARMAN® Centrifugal Slurry Pumps GEHO® PD Slurry Pumps LINATEX® Rubber Products VULCO® Wear Resistant Linings CAVEX® Hydrocyclones ENDURON® Comminution Equipment KHD* High Pressure Grinding Rolls FLOWAY® PUMPS Vertical Turbine Pumps ISOGATE® Slurry Valves MULTIFLO® Mine Dewatering Solutions HAZLETON® Specialty Slurry Pumps LEWIS® PUMPS Vertical Chemical Pumps WEIR MINERALS SERVICES™ For further information on any of these products or our support services contact your nearest sales office or visit:

www.weirminerals.com Weir Minerals Division

Excellent Minerals Solutions

www.weirminerals.com Copyright © 2013, Weir Slurry Group, Inc. All rights reserved. WARMAN and CARS are trademarks and/or registered trademarks of Weir Minerals Australia Ltd and Weir Group African IP Ltd; CAVEX, HAZLETON and MULTIFLO are trademarks and/or registered trademarks of Weir Minerals Australia Ltd; LEWIS and LEWIS PUMPS are trademarks and/or registered trademarks of Envirotech Pumpsystems Inc; GEHO is a trademark and/or registered trademark of Weir Minerals Netherlands bv; FLOWAY is a trademark and/or registered trademark of Weir Floway Inc.; VULCO is a trademark and/or registered trademark of Vulco SA; ISOGATE is a trademark and/or registered trademark of Weir do Brasil Ltda.; LINATEX is a trademark and/or registered trademark of Linatex Ltd; ENDURON is a trademark and/or registered trademark of Weir Minerals Europe Ltd; WEIR is a trademark and/or registered trademark of Weir Engineering Services Ltd. *KHD is a Humboldt Wedag GmbH brand used under licence by The Weir Group