Multi-Cell Laboratory Flotation Bank

What is the Multi-Cell Laboratory Flotation Bank?

A multi-cell laboratory flotation bank links three to eight cells in series so that rougher, cleaner and scavenger stages can be tested continuously. It reproduces circuit behaviour better than single batch tests.

Overview

Each cell has its own impeller, air supply and froth scraper, and pulp flows from one cell to the next, with concentrate and tailings collected separately at each stage. This arrangement allows a circuit to be tested under continuous feed conditions: rougher concentrate can be cleaned, scavenger tails can be discarded, and intermediate streams can be recirculated to approximate plant operation. Feed is supplied by a peristaltic or slurry pump at a controlled rate and pulp density, and stage performance is monitored by sampling each stream and closing the metal balance. Multi-cell banks are used for flowsheet development, reagent distribution studies between stages and locked-cycle testing, and they provide the data needed for scale-up, since retention time per stage and circulating loads can be measured directly.

How does it work?

Froth flotation separates particles by their surface chemistry. The ore is ground to a size at which the target mineral is liberated, mixed with water to form a pulp of a chosen solids concentration, and conditioned with collectors that make selected minerals hydrophobic and frothers that stabilise bubbles. Air is dispersed into the pulp, either by a mechanical impeller that draws air from above or by forced air through a sparger, and hydrophobic particles attach to rising bubbles to form a froth that is scraped off as concentrate. Hydrophilic particles remain in the pulp and are discharged as tailings. Bench equipment therefore needs controllable agitation, aeration, pH and reagent addition, plus a cell that allows froth to be removed at a steady rate. Results are scaled up using retention time, solids concentration and reagent dosage per tonne, with grinding and liberation established separately by the ore's size distribution.

What are the key features?

• Three to eight cells linked in series
• Independent agitation and aeration per cell
• Separate concentrate and tailings collection per stage
• Controlled feed by pump at set flow and density
• Provisions to recirculate intermediate streams
• Sampling points on all process streams

What are the technical specifications?

A typical multi-cell laboratory flotation bank configuration offers number of cells of 3–8, cell volume of 0.5–5 L, feed flow rate of 0.2–20 L/min, pulp density of 10–45 % solids by mass, air flow per cell of 0–10 L/min adjustable and impeller speed of 0–2000 rpm per cell. Values are indicative of the product class; the exact figures for each configuration are confirmed on the quotation and the calibration documents supplied with the instrument.

Which applications is it used for?

The Multi-Cell Laboratory Flotation Bank is used in continuous circuit flowsheet development, reagent distribution between flotation stages, locked-cycle testing before pilot campaigns and scale-up data for retention time and circulating load. Across the wider Flotation Equipment class, laboratories also deploy it for reagent scheme development for ore bodies, rougher, cleaner and scavenger circuit configuration and grind size and liberation optimization.

Which standards and certifications apply?

Relevant standards and methods include ISO 8858-1, ASTM D5114, ISO 3082, ISO 12743, ASTM E877 and IEC 61010-1. Certification candidates for this model are CE and ISO 9001 manufacturing; each is to be confirmed for the specific configuration before shipment, and certificates are supplied only where they have been issued.

Calibrate and record the basic variables with every test: solids concentration, grind size distribution, pH, reagent dosages, air flow, impeller speed and flotation time. Rinse the cell and impeller thoroughly between tests, because residual collector changes the next result, and use consistent water quality, since dissolved ions affect flotation strongly in recycled plant water. Check impeller clearance and wear, air spargers, scraper blades and pH electrodes on a schedule. Provide splash guards, eye protection and fume extraction for reagent and acid handling, and store collectors and frothers safely. For result transfer to plant, run replicate tests and report grade and recovery with the metal balance closed; locked-cycle or cycle tests are then used to estimate steady-state performance before any plant trial.

How do I select the right Multi-Cell Laboratory Flotation Bank?

Select the multi-cell bank for flowsheet development where continuous operation and stage-by-stage data are required. Specify cell count and volume, feed pumping, air control per cell, intermediate recirculation and the sampling points and instrumentation package needed for each stage.

How does it compare with other Flotation Equipment variants?

Start from the ore mass available and the question to be answered. A single self-aerating or sub-aeration cell of one to three litres suits reagent screening, pH and dosage tests with a few hundred grams of sample. Multi-cell banks of three to eight cells are used for rougher, cleaner and scavenger configurations or for locked-cycle tests that approximate a continuous circuit. Flotation columns suit fine particles and cleaner duties where a deep froth and wash water give better grade. Conditioning tanks are needed whenever reagents require contact time before flotation, which is often the decisive step for collector performance. Check impeller and air-flow ranges against the pulp density you will use, whether froth scraping is manual or automatic, and whether the machine can hold pH, temperature and air rate stable enough for reproducible recoveries. Plan reagent dosing and water supply as part of the package.