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metallurgical - essa australia - pdf catalogs | technical documentation | brochure

metallurgical - essa australia - pdf catalogs | technical documentation | brochure

BALL MILLS, ROD MILLS & BOND INDEX MILLS Labtech Essa manufacture a range of metallurgical laboratory sized 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 (see sheet 2 of this data sheet) 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...

BALL MILLS, ROD MILLS & BOND INDEX MILLS LABTECH ESSA BOND INDEX BALL AND ROD MILLS 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 closed circuit grindability tests developed by F.C.Bond in the mid 1930s. 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...

BOTTLE ROLLERS Labtech 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. The...

PRESSURE FILTERS FOR DEWATERING LABORATORY SIZE BATCHES OF SLURRY SAMPLE AND PROCESS CONCENTRATE Labtech Essa pressure filters consist essentially of a vertical cylindrical barrel arranged to have a filter cloth installed at its lower end and to have a batch of slurry or process concentrate introduced at its 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. 24 litre, floor mounted with screw type lid & base plate 13 litre,...

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...

what are the differences between ball mill and rod mill? | fote machinery

what are the differences between ball mill and rod mill? | fote machinery

Ball mill and rod mill are the common grinding equipment applied in the grinding process. They are similar in appearance and both of them are horizontal cylindrical structures. Their cylinders are equipped with grinding medium, feeder, gears, and transmission device.

The working principle of ball mill and rod mill machine is similar, too. That is, the cylinder drives the movement of the grinding medium (lifting the grinding medium to a certain height then dropping). Under the action of centrifugal force and friction, the material is impacted and ground to required size, so as to realize the operation of mineral grinding.

Grate discharge ball mill can discharge material through sieve plate, with the advantage of the low height of the discharge port which can make the material pass quickly so tha t to avoid over-grinding of material. Under the same condition, it has a higher capacity and can save more energy than other types of mills;

It is better to choose a grate discharge ball mill when the required discharge size is in the range of 0.2 to 0.3 mm. Grate discharge ball mill is usually applied in the first grinding system because it can discharge the qualified product immediately.

Overflow discharge ball mill can grind ores into the size under 0.2 mm, so it is very suitable for the second grinding system. The capacity of it is about 15% lower than grate discharge ball mill in the same specification, and the loaded grinding medium is also less than that one.

It can be divided into three types of rod mills according to the discharge methods, center and side discharge rod mill, end and side discharge rod mill and shaft neck overflow discharge rod mill.

It is fed through the shaft necks in the two ends of rod mill, and discharges ore pulp through the port in the center of the cylinder. Center and side discharge rod mill can grind ores coarsely because of its structure.

This kind of rod mill can be used for wet grinding and dry grinding. "A rod mill is recommended if we want to properly grind large grains, because the ball mill will not attack them as well as rod mills will."

It is fed through one end of the shaft neck, and with the help of several circular holes, the ore pulp is discharged to the next ring groove. The rod mill is mainly used for dry and wet grinding processes that require the production of medium-sized products.

The diameter of the shaft neck is larger than the diameter of the feeding port about 10 to 20 centimeters, so that the height difference can form a gradient for ore pulp flow. There is equipped with a spiral screen in the discharge shaft neck to remove the impurities.

It has high toughness, good manufacturability and low price. The surface layer of high manganese steel will harden rapidly under the action of great impact or contact. The harder index is five to seven times higher than other materials, and the wear resistance is greatly improved.

It has high toughness, good manufacturability and low price. The surface layer of high manganese steel will harden rapidly under the action of great impact or contact. The harder index is five to seven times higher than other materials, and the wear resistance is greatly improved.

It is made of several elements such as chromium and molybdenum, which has high hardness and good toughness. Under the same work condition, the service of this kind of ball is one time longer than the high manganese steel ball.

After the professional technology straightening and quenching processing process, a high carbon steel rod has high hardness, excellent performance, good wear resistance and outstanding quality.

The steel ball of ball mill and the mineral material are in point contact, so the finished product has a high degree of fineness, but it is also prone to over-grinding. Therefore, it is suitable for the production with high material fineness and is not suitable for the gravity beneficiation of metal ores.

The steel rod and the material are in line or surface contact, and most of the coarse particles are first crushed and then ground. Therefore, the finished product is uniform in quality, excellent in particle size, and high in qualification rate.

The cylinder shape of the rod mill and the ball mill is different: the cylinder of the rod mill is a long type, and the floor area is large. The ratio of the length to the diameter of the cylinder is generally 1.5 to 2.0;

The cylinder of the ball mill is a barrel or a cone. And the ratio of the length to the diameter of the cylinder is small, and in most cases the ratio is only slightly larger than 1, and the floor area is small, too.

The above is the main content of this article. The ball mill and the rod mill are the same type of machine on the appearance, but there are still great differences in the interior. It is very necessary to select a suitable machine for the production to optimize the product effect and maximize its efficiency.

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