Pressure Filters

For dewatering laboratory size batches of slurry sample and process concentrate

Essa pressure filters consist essentially of a vertical cylindrical barrel arranged to have a filter cloth installed at it’s lower end and to have a batch of slurry or process concentrate introduced at it’s upper end. The cylinder is then sealed and (air)pressurised, forcing the liquid to be separated from the solids content and discharged from the barrel, leaving the solids behind as an easily recoverable filter cake.

Flotation Test Machine

A bench top laboratory apparatus for establishing the percentage of reagents in a production flotation cell and for metallurgical test work

This versatile unit is used in metallurgical laboratories to perform agitation, attrition scrubbing and blending tests that can be replicated in a production environment. The variable speed control is complete with digital readout of the rotating speed of the impeller for greater accuracy, optimum speed control and repeatability. Feed back capability is available as an optional extra. The unit is also supplied as standard with integrated air pressure and volume controls complete with read-out.

The test cells and their corresponding impellers are supplied as optional extras. The standard cells are of clear see-through acrylic in 0.5, 1.75, 3.0 and 5.0 litre capacity. The drive motor is 0.75 kW, for connection to a single phase power supply.

Bottle Rollers

Essa continuous duty bottle rollers are used for batch wet leaching and wet or dry grinding or blending of a wide variety of ores, minerals and similar particulate. They find particular application in the acid leaching of finely ground ore in mineral analytical laboratories. The unit is comprised essentially of rubber covered contra-rotating rollers on which plastic, ceramic or metallic jars containing the particulate are placed. The bottles are then rolled about their own horizontal axis until the desired leaching, grinding or blending result is obtained.

Essa offer 3 roll, 6 bottle and 3 roll, 12 and 24 bottle fixed rotational speed models suitable for 5 litre plastic bottles as the basic standard units in our range. These are available with variable speed drive and timer options. These two standard models are complemented by a wide choice of other capacities that are tailored to suit specific customer needs. This can include multi-tier units and the capacity to roll multiple 10 and 20 litre containers. All units are delivered fully assembled and with power lead and on/off switch ready for easy installation and connection to the customer’s power supply.

Bond Testwork Equipment

Internationally accepted mineral metallurgical standard test procedures to determine the physical properties of ores include the Bond ball mill work index and the Bond rod mill work index.

These are empirical indices determined by close circuit grindability tests developed by F.C.Bond in the mid 1930’s. They require a specific 305mm diameter x 305mm long (inside dimensions) horizontal axis ball mill without lifters operating at 70 rpm to perform grindabilities from 28 to 500 mesh and a 305mm diameter x 610mm long rod mill with a wave type liner operating at 46 rpm to perform grindabilities from 4 to 65 meshes.

Essa's ball and rod mills can be supplied as complying machines with the appropriate barrels and ball or rod charges. As with our standard range of ball and rod mills, the Essa bond index ball mill and bond index rod mill are supplied standard with a barrel and rotating yoke assembly and the electric motor drive mounted on a stand alone bench, funnel and screen. These machines will be of essentially the same physical arrangement and size as our standard range but with the customised features required to meet the Bond specifications.

Laboratory Rod Mills

Essa manufacture a range of metallurgical laboratory size ball and rod mills to suit most applications. Included in the range is a Bond Index Mill, which has specific application in establishing the grindability of ores.

The ball and the rod mill are of essentially the same basic concept comprising a barrel mounted in a rotating yoke assembly, which is driven through a gearbox from a three phase electric motor. The barrel is pivot mounted on the rotating yoke and can be tilted for loading and discharge. A spring loaded locking pin is used to hold the barrel in its horizontal operating position. A manually operated locking mechanism ensures the removable lid of the barrel is sealed tight during operation.

The mills are supplied standard with a barrel and rotating yoke assembly and the electric motor drive all mounted on a stand with a discharge funnel and screen. Just the barrel, yoke and drive mechanism can be mounted on a flat plate for attachment to the customer‘s work bench if required.

Laboratory Ball Mills

Essa manufacture a range of metallurgical laboratory size ball and rod mills to suit most applications. Included in the range is a Bond Index Mill, which has specific application in establishing the grindability of ores.

The ball and the rod mill are of essentially the same basic concept comprising a barrel mounted in a rotating yoke assembly, which is driven through a gearbox from a three phase electric motor. The barrel is pivot mounted on the rotating yoke and can be tilted for loading and discharge. A spring loaded locking pin is used to hold the barrel in its horizontal operating position. A manually operated locking mechanism ensures the removable lid of the barrel is sealed tight during operation.

The mills are supplied standard with a barrel and rotating yoke assembly and the electric motor drive all mounted on a stand with a discharge funnel and screen. Just the barrel, yoke and drive mechaism can be mounted on a flat plate for attachment to the customer‘s work bench if required.