rod mill for gold

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.

As a leading mining machinery manufacturer and exporter in China, we are always here to provide you with high quality products and better services. Welcome to contact us through one of the following ways or visit our company and factories.

Based on the high quality and complete after-sales service, our products have been exported to more than 120 countries and regions. Fote Machinery has been the choice of more than 200,000 customers.

rod mills

rod mills

A rod mill uses steel rods as the grinding media in tumbling mills is an efficient means to feed ball mills a product finer than could be made in a crusher but coarser than could be made in a ball mill. The principal use for rod mills, which were invented to make ball mill feed in a wet-grinding rod mill-ball mill circuit.

Rod mills came into use in the United States beginning in 1900s and eventually became recognized as efficient fine crushers. The 1st ever built rod mill (2 m in diameter by 4 m long) was to be installed at a mine where a coarser feed was required for shaking tables. Crushing rolls and rod mills were eventually used commonly to prepare feed to shaking tables. Later, rod mills of 2.9 m in diameter by 3.9 m long replaced most roll crushers.

With the increase in the diameter of rod mills, problems occurred in the shorter rod mills with rods tangling. When the rods were short relative to the diameter, some were lifted toward a vertical position, and continued tumbling caused tangling. This led to the arbitrary rule that the length of rods should be at least 1.5 times the mill diameter inside new shell liners.

The crushing action of the rod mass in a rod mill has been described and is illustrated in diagrams taken from his work in Figure 1. The progressive sizing of material from the feed to the discharge end of the mill by the tapered slot openings between the rods, and the resulting effective internal classification has been widely observed and documented. Apparently, the rod mass acts as an effective screen, holding back coarse particles from progressing along the length of the mill until crushed fine enough to pass along the slots. As well, the coarser particles tend to take the brunt of the rod impacts, and hold the rods apart, preventing the finer particles from being overground. These basic mechanisms ore consistently observable in the size distributions of rod mill products despite a multitude of other complex interactions taking place in the elevated charge, in the slurry pool, and due to the nature of the ore, slurry rheology, and mill design and operating variables. The historical trend towards producing a coarser rod mill discharge (equivalent to a higher feed rate per unit of mill power draw or volume) parallels the recognition of its natural preference to perform work on coarse material.

Energy efficiency in grinding is directly related to circuit economic performance because of the close interdependence of energy and media consumption, and their combined dominance of total direct grinding costs. Energy usage itself is the prime criterion by which grinding circuit process performance can be technically evaluated using the Bond Operating Work Index. As well, a knowledge of the possible range and nature of individual equipment energy consumption is required to determine the scope of possible changes in the process performance characteristics of each comminution stage. The following discussion therefore focuses on the effects of design or operating variables on both power draw and power efficiency, as well as giving consideration to some practical constraints for operating ease and stability.

rod mill | henan deya machinery co., ltd

rod mill | henan deya machinery co., ltd

Rod mill is by a rotating drum causes friction and attrition between steel rods and ore particles. Rod mills are less common than ball mills for grinding minerals. The rods used in the mill, usually a high-carbon steel, can vary in both the length and the diameter. However, the smaller the rods, the larger is the total surface area and hence, the greater the grinding efficiency.

Rod mill, it may be considered as either fine crusher or coarse grinding machine. It is capable of taking feed as large as 50 mm and making a product as fine as 300m, reduction ratios normally being in the range 15:1 to 20:1. The distinctive feature of a rod mill is that the length of the cylindrical shell is between 1.5 and 2.5 times its diameter.

ball mill for sale | grinding machine - jxsc mining

ball mill for sale | grinding machine - jxsc mining

Ball mill is the key equipment for grinding materials. those grinding mills are widely used in the mining process, and it has a wide range of usage in grinding mineral or material into fine powder, such as gold, ironzinc ore, copper, etc.

JXSC Mining produce reliable effective ball mill for long life and minimum maintenance, incorporate many of the qualities which have made us being professional in the mineral processing industry since 1985. Various types of ball mill designs are available to suit different applications. These could include but not be restricted to coal mining grate discharge, dry type grinding, wet mineral grinding, high-temperature milling operations, stone & pebble milling.

A ball mill grinds ores to an end product size of thirty-five mesh or finer. The feeding material to a ball mill is treated by: Single or multistage crushing and screening Crushing, screening, and/or rod milling Primary crushing and autogenous/semi-autogenous grinding.

Normal feed sizes: eighty percent of six millimeters or finer for hard rocker eighty percent of twenty-five millimeters or finer for fragile rocks (Larger feed sizes can be tolerated depending on the requirements).

The ratio of machine length to the cylinder diameter of cylindrical type ball mills range from one to three through three to one. When the length to diameter ratio is two to one or even bigger, we should better choose the mill of a Tube Mill.

Grinding circuit design Grinding circuit design is available, we experienced engineers expect the chance to help you with ore material grinding mill plant of grinding circuit design, installation, operation, and optimization. The automatic operation has the advantage of saving energy consumption, grinding media, and reducing body liner wear while increasing grinding capacity. In addition, by using a software system to control the ore grinding process meet the requirements of different ore milling task.

The ball mill is a typical material grinder machine which widely used in the mineral processing plant, ball mill performs well in different material conditions either wet type grinding or dry type, and to grind the ores to a fine size.

Main ball mill components: cylinder, motor drive, grinding medium, shaft. The cylinder cavity is partial filling with the material to be ground and the metal grinding balls. When the large cylinder rotating and creating centrifugal force, the inner metal grinding mediums will be lifted to the predetermined height and then fall, the rock material will be ground under the gravity force and squeeze force of moving mediums. Feed material to be ground enters the cylinder through a hopper feeder on one end and after being crushed by the grinding medium is discharged at the other end.

Mining Equipment Manufacturers, Our Main Products: Gold Trommel, Gold Wash Plant, Dense Media Separation System, CIP, CIL, Ball Mill, Trommel Scrubber, Shaker Table, Jig Concentrator, Spiral Separator, Slurry Pump, Trommel Screen.

tubular rod mills - sciencedirect

tubular rod mills - sciencedirect

The designs of tubular mills loaded with steel rods along its length as the grinding medium are described in this chapter. Details of operation and computations of mill capacities and the power consumption are explained with illustrative practical examples and solution of problems useful for both understanding the process and its practical operation. The importance of rod mills in comminution circuits is explained by flow diagrams and sketches. Mathematical correlations of variables are explained with examples and worked solutions.

what is a rod mill? (with picture)

what is a rod mill? (with picture)

A rod mill is an ore grinding mechanism that uses a number of loose steel rods within a rotating drum to provide its attrition or grinding action. An ore charge is added to the drum, and as it rotates, friction between the tumbling rods breaks the ore down into finer particles. Although similar in operation, a rod mill is often more effective than a ball mill as it requires lower rotational speeds and less steel to achieve the same results. It is, however, limited to maximum rod and drum lengths of approximately 20 feet (6 meters) and is generally only used for wet grinding processes. The rod mill also tends to suffer from accelerated drum liner and lifter wear due to the increased weight of the rods.

Mills of various types have been used for centuries to break solids or coarse particulate materials down into finer finished products. From the humble mortar and pestle through animal, wind, and water driven mills to the giant electrically driven versions common in modern industrial applications, all share one common characteristic: mechanical attrition or grinding. All mill types utilize a grinding process of one or another description to gradually reduce the size of the initial charge of material. In older mills, for example, this action was achieved by placing the coarse material between two mill stones and turning one against the other to produce a finer end product.

Modern rotary mills make apply the same principle by tumbling loose grinding elements around in a closed drum to which the charge material is added. Common examples are rod and ball mills, both of which are of the rotary drum type which rely on internal grinding agents to achieve their milling action. Unlike the ball mill which utilizes a large number of hardened steel balls to impart the grinding action, the rod mill uses steel rods lying within the drum and parallel to its axis. When the drum rotates, these rods roll around inside it, thereby crushing the feed material between them.

The rod mill is generally more efficient than the ball mill due to its more effective cascading action and the greater bearing surface offered by the rods. This means it can operate at lower speeds and with less grinding agents and producing less undesirable slimes byproduct. Rod mills do, however, require more attention during operation to prevent rod tangles and are generally ineffective at dry milling operations. They are also limited to a maximum rod length of approximately 20 feet (6 meters) which means they are generally smaller than ball mills. Rod mills also exhibit more liner and lifter wear than other mill types due to the comparatively high weights of the rods.

henan mining machinery and equipment manufacturer - best rodmill design for gold

henan mining machinery and equipment manufacturer - best rodmill design for gold

... Svedalla Rod Mill for Sale. D'Angelo Best Rod Mill manufacturers & Rod ... Rod Mill - Coles Mining Coles Mining. Gold Processing ... Original Design ...Got Rocks? Our gold mill Gold Stryker can take these rocks ...

Ore beneficiation equipment, sand making equipment, crushing equipment and powder grinding equipment, which are widely used in various industries such as metallurgy, mine, chemistry, building material, coal, refractory and ceramics.

2480-150 invimec / fenn type 12-head fine wire/rod tandem rolling mill with high chromium steel rolls gold international machinery | the one stop shop for all of your machinery, equipment, tool & die needs

2480-150 invimec / fenn type 12-head fine wire/rod tandem rolling mill with high chromium steel rolls gold international machinery | the one stop shop for all of your machinery, equipment, tool & die needs

[ Mailing Address | Gold International Machinery, Corp | P.O. Box 998 Pawtucket, RI 02862 ] [ Physical Address: | 136 Newell Avenue | (corner of Thurston & Newell Sts.) | @Exit 26, Route 95 North | Pawtucket, RI USA 02860-0998 ] [ [email protected] | Toll Free: 1-800-619-GOLD | Phone: 401-724-3200 | Fax: 401-728-5770 ]

united states locations

united states locations

As the largest copper and molybdenum producer in North America, we have opportunities at multiple locations for you to join our company. In the United States, we have six copper mines: Morenci, Bagdad, Sierrita and Safford in Arizona, and Tyrone and Chino in New Mexico. We have molybdenum mining operations in Colorado at the Henderson mine and the Climax mine, and we produce molybdenum concentrates at several other mine sites, primarily Sierrita, Bagdad and Morenci. We also have multiple processing facilities throughout the U.S. All of our sites in the U.S. are open-pit mines except Henderson.

As a company-owned town, Bagdad offers employees single-family homes, a family atmosphere and numerous amenities, including an aquatic center, a golf course and a fitness center. Located 100 miles northwest of Phoenix, Bagdad is home to the world's first commercial-scale concentrate leach processing facility as well as one of the longest continously operating solvent extraction / electrowinning plant in the world. Visit the Bagdad town website to learn more.

Just 15 miles from the historic mining community of Silver City in southwest New Mexico, the Chino mine includes a 36,300-metric-ton-per-day concentrator producing copper and molybdenum concentrates and a solvent extraction / electrowinning facility.

Leadville, a charming, historic mountain town 100 miles southwest of Denver, is North America's highest incorporated city, at an elevation of 10,430 feet. Employeeswho work at the open-pit molybdenum mine not only will find a collegial working atmosphere but also all the great outdoor recreation Colorado offers. Visit our Climax Molybdenum Company website to learn more.

Just 42 miles west of Denver, the Henderson block-cave underground mine is close to spectacular hiking, biking, rafting and skiing in the rocky Mountains. The molybdenum mine and mill are connected by a 15-mile conveyor belt - the largest of its kind in the world - that passes under the Continental Divide. Visit our Climax Molybdenum Company website to learn more.

Morenci is nestled in an area know for outdoor activitieslike hiking, fishing, camping and hunting. The town is owned by the company and offers employees and their families a number of amenities including company housing, a newly constructed day care and community center, a library, health-care facilities, a fitness center, a movie theater, and a skate park. In addition, a dedicated Parks and Recreation Division plans activities for all ages. Visit the Morenci town website to learn more.

The Safford mine is a zero-discharge facility and one of the most sustainable mines in the United States. It's been in operation since 2007 in southeastern Arizona, close to more than 4 million acres of national forest with fishing, rafting, hiking and more. Nearby educational options for you or your family include a Northern Arizona University satellite campus, Eastern Arizona College and the Gila Institute for Technology.

Sierrita is a mining complex located 20 miles south of Tucson, Arizonas second largest city. Our nearby Mine Training Institute provides our people with a new, state-of-the-art training facility that includes classrooms, lab space and simulators. In addition to copper and molybdenum, the mine produces rhenium, a rare and highly valued metal.

Located 10 miles from Silver City, the Tyrone mine originally was mined by Native American communities for turquoise. After decades as an underground mine, the property began operation as an open pit in 1967. Tyrones solvent extraction / electrowinning copper processing facilities operate with a maximum capacity of approximately 100 million pounds of copper per year.

The Climax Technology Center is a state-of-the-art metals processing plant located about 16 miles from the companys Sierrita mine in southern Arizona. The facility uses the most advanced technologies available for the production of high-purity molybdenum metal powders and pellets used for various applications.

Our rod and refining plant in El Paso, Texas, is a key contributor to our ranking as one of the worlds largest manufacturers of continuous cast copper rod, a main material used in the manufacturing of wire and cable products. The El Paso refinery has the potential to operate at an annual production capacity of about 900 million pounds of copper cathode, which is sufficient to refine all of the copper anode we produce at our Miami, Arizona operation. Our El Paso refinery also produces nickel carbonate, copper telluride and autoclaved slimes material containing gold, silver, platinum and palladium.

The Fort Madison chemical plant, operational since late 1977, is an important companion to other conversion and operating facilities of Climax Molybdenum Company, a subsidiary of Freeport-McMoRan. The plant was expanded in 1995, maintaining its status as the largest facility of its type in the world. Located on the banks of the Mississippi River in southeast Iowa, the Fort Madison facility is the worlds largest and highest-quality producer of lubricant grade molybdenum disulfide, sublimed pure molybdic oxide, calcined pure molybdic oxide, ammonium dimolybdate, ammonium heptamolybdate, ammonium octamolybdate and sodium molybdate.

Our Miami smelter and rod mill is in the heart of Arizona's historic Globe-Miami mining district. Located 90 miles east of Phoenix, the smelter processes copper concentrate primarily from our companys Arizona copper mines and also is the most significant source of sulphuric acid for our North America leaching operations. The rod mill produces 7,500-pound and 15,000-pound copper rod coils.

Our Technology Center is home to a team of globally recognized engineers and scientists who provide innovative mining, processing and environmental solutions to our operations throughout the world. Our people make use of state-of-the-art laboratories and test facilities, including a fully automated analytical labthe first of its kind in the Americas. Employees provide direct support in a variety of areas: mineral processing, hydrometallurgy, analytical chemistry, mineralogy, process economics, mining and geology.

Our global headquarters is located in Phoenix, Arizona. Several hundred employees support global operations in finance, human resources, information technology, planning and more from the main office, satellite offices or remotely.

buy gold wire and rod from surepure chemetals

buy gold wire and rod from surepure chemetals

A soft, yellow, corrosion-resistant precious element, the most malleable and ductile metal. A good thermal and electrical conductor, gold is sometimes alloyed to increase its strength. It is used in jewelry, and as a plated coating on a wide variety of electrical and mechanical components. Atomic number 79; atomic weight 196.967; melting point 1,063.0C; boiling point 2,966.0C; specific gravity 19.32 g / cm^3. Standard purity is 99.95%. Also available as 99.99% pure, 99.999% pure, and 14 karat. Gold is available in wire, sheet, rod, tube, casting pieces, powder and shapes. Many items are in stock or have short fabrication times. Surepure can draw gold wire to below 0.001 inch diameter and roll sheet to below 0.001 inch thick. Surepure has sputtering targets of various sizes. Contact us to learn more about our quick delivery to meet your exact requirements.

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