The material to be ground is loaded into the drum along with the grinding media and rotated until the desired particle size is achieved. There are several types of ball mills, each designed for a specific purpose. ... we can provide customers with types of ball mill, vertical mill, rod mill and AG/SAG mill for grinding in a variety of ...
of 34.8 % for the rod compartment and 65.2 % for the ball compartment. The Bond formula (Equation 2) was used to calculate the required power for both compartments (rod and ball) for each scenario. Requirements include: power to maximize the feed rate of the mill while achieving a P 80 of 300 μm, available power (401 kW for rod and 753 kW for ...
For example, a ball mill may be converted into a SAG mill or a rod mill into a ball mill. Refurbishment is treated as a turnkey project ... Mill Dimensions . Max (kW) D (Feet) L (Feet) 90. 6. 8. 275. 8. 12. 350. 8. 16. 350. 9. 12. 500. 9. 15. 1200. 12. 16. Motor Power.
A shell length above 6100 mm can not be recommended. As the length to diameter ratio of the mill should be in the range of 1,2-1,5, the biggest rod mill will convert maximum 1500 kW. Rod mills are used for primary grinding of materials with a top size of 20-30 mm (somewhat higher for soft materials).
The following equation is used to determine the power that wet grinding overflow ball mills should draw. For mills larger than 3.3 meters (10 feet) diameter inside liners, the top size of the balls used …
The grinding medium of the rod mill is in linear contact with the ore. Most of the coarse particles are ground first, and a small part of the fine particles are ground. The product is rough. Advantages and disadvantages of ball mill and rod mill 1. Ball mill Get Latest Price. Advantages:
Ball mills. Ball mill (Fig 1) is same kind of mill as rod mill, except that it is filled with balls instead of rods. Because of balls have greater ratio of surface area than rods they are more suitable for fine grinding. Balls are also lighter, so the kinetic energy of a single dropping ball is smaller than a rod.
A shell length above 6100 mm can not be recommended. As the length to diameter ratio of the mill should be in the range of 1,2-1,5, the biggest rod mill will convert maximum 1500 kW. Rod mills are used for …
The apparent difference in capacities between grinding mills (listed as being the same size) is due to the fact that there is no uniform method of designating the size of a mill, for example: a 5′ x 5′ Ball Mill has a working diameter of 5′ inside the liners and has 20 per cent more capacity than all other ball mills designated as 5′ x ...
DOVE highly efficient Rod Mills, largest range in industry, up to 180 TPH, up to (5) years manufacturer's warrantee. ... KW: RM-0306: 1.5 – 6: 30: 22: RM-0308: 3 – 10: 40: 30: RM-0310: 4 – 12: 40: 30: RM-0408: 5 – 13: 50: 37: RM-0510: 6 – 25: 101: 75: ... DOVE Rod Mill also referred to as steel rod mill shape is similar to DOVE Ball ...
The next two examples are for rod mill ball mill circuits. Figure 2 shows a conventional rod mill-ball mill circuit. The data for this circuit and Wi0 calculations are: Rod mill size 3.5m x 4.88m (11.5′ x 16′ …
The basic parameters used in ball mill design (power calculations), rod mill or any tumbling mill sizing are; material to be ground, characteristics, Bond Work Index, …
V — Effective volume of ball mill, m3; G2 — Material less than 0.074mm in product accounts for the percentage of total material, %; G1 — Material less than 0.074mm in ore feeding accounts for 0.074mm in the percentage of the total material, %; q'm — Unit productivity calculated according to the new generation grade (0.074mm), t/(m3.h). The …
[Introduction]: Rod mill is a grinding equipment with steel rod as medium [Capacity]: 0.62～250t/h [Improvement]: TAYMA rod mills include overflow rod mill, end peripheral …
These mills typically grind ROM ore in a single stage. A large example of such a mill was converted from a single-stage milling application to a semi autogenous ball-mill-crushing circuit, and the application is well described. This refers to high-aspect AG/SAG mills. Ball Charge Motion inside a SAG Mill. With a higher density mill charge.
Explain the use of rod mills in mineral industry. Explain rod mill operation. Recognize different design parameters of rod mills. Explain problems associated with rod milling. Summarize considerations in rod mill …
Power drawn at the pinion is 448 kW, 13.617 kWh/tonne (SAG mill) and 570 kW, 17.325 kWh/tonne (ball mill) when processing 32.9 mtph, for a total of 30.942 kWh/tonne or 14.6% above the conventional estimate. A ball charge volume which is lower than those tested has been selected in order to minimize wear.
Rod mills are widely applied in cement industry, chemical industry, new building materials, fire-resistant materials, fertilizer, porcelain and glass industry etc. Rod mill crushes generally coarser than those produced in Ball mills, and rod mills are well suited to handle coarser feed and to control the bigger size of the product.
The following equation is used to determine the power that wet grinding overflow ball mills should draw. For mills larger than 3.3 meters (10 feet) diameter inside liners, the top size of the balls used affects the power drawn by the mill.
Figure 7.2 B indicates a mill where a diaphragm or grate is placed before the exit end so that particles greater than the openings of the diaphragm are not discharged but held back for further grinding. Grate discharge mills give less excessive grinding compared to overflow mills and are best suited to grinds to 150–250 μm. In Figure 7.2 C, the …
The main difference between a rod mill and a ball mill is the grinding medium. Rod mills use long steel rods as the grinding medium, while ball mills use steel balls. Additionally, rod mills are better suited to handling larger feed sizes, and they create a more uniform particle size distribution than ball mills. What are the main components of ...
Description. GTEK XMB series rod ball mill is an efficient laboratory grinding equipment for wet grinding of ore or other materials.Steel balls can be used as grinding medium instead of steel rods. In rod grinding operation, particle sizes of final product are relatively uniform and ore overgrinding can be eliminated. Generally speaking, lab rod mill is commonly used …
The ball mill work index is shown below. BM Wi (kW-hr/st) = 17.97 ; BM Wi (kW-hr/mt) = 19.81; Bond Ball Mill. ... When Wip and WiF have been calculated for the desired ball or rod mill product size P and feed size F the following modified form of Eq. (1) is used to obtain the accurate work input required:
1. Rod Mill and Ball Mill. Rod mills are grinding machine which employ high carbon steel or special steel rods of nearly the same length as that of the drum, in place of steel balls in ball mills. Rod mill products are …
Learn how to calculate the size of a ball mill or rod mill and determine the appropriate motor dimensions for efficient operation.
Referring to Table VI the L/D can be between 1.75 and 2.0 or even greater. Referring to Table VII a 3.05 meter (10 foot) by 3.05 meter (10 foot) overflow ball mill with a 40 percent by mill volume ball charge, new liners and 50 mm (2″) balls draws 491 HP. Using equation 5 there will be a loss of 0.55 Kw (0.74 Hp) per metric tonnes of balls.
It is known (Arbiter and Harris, 1980; Rowland and Kjos, 1980; Arbiter and Harris, 1982; Harris and Arbiter, 1982; Dor and Bassarear, 1982; Turner, 1982; Austin et ai., 1992; Stamboltzis and Tsakalakis, 1993) that the power drawn from tumbling mills (rod, ball-mills, etc.) is given from the general equation: (12) where p is the apparent ...
where v = peripheral speed of the mill in feet per minute. If the observed capacity of a mill at speed n1 is = T1 tph, the capacity T2 of the same mill at speed n2 should be . The acceleration factor of the ball or rod mass is a function of the peripheral speed of the mill. Thus. P = f4(F) = f1(D²)·f5(υ) Indicating that υ = πDn, and
Do you need a quick estimation of a ball mill's capacity or a simple method to estimate how much can a ball mill of a given size (diameter/lenght) grind for tonnage a product P80 size? Use these 2 …
The basic parameters used in ball mill design (power calculations), rod mill or any tumbling mill sizing are; material to be ground, characteristics, Bond Work Index, bulk density, specific...
Mill Size Dia X Length ft (m) Dimensions Inches (mm) * "A" ** Dimensions Inches (mm) * "B" Dimensions Inches (mm) * "C" Dimensions Inches (mm) * "D" Wt. w/o Grinding Balls or Pulp Lb (kg) 3 …
* Ball/Rod Mills offer 2 mounting options as on complete frame or frames embedded to concrete, according to system requirements and preferences of our customers. * Mill operating parts are protected against external influences with covers and sealing systems. * Our mill design is compatible with latest safety regulations.
Ball Mill Rod Mill Autogenous Mill; Length: Diameter Ratio: 1.4 to 1.8: 0.5 to 3.5: 0.25 to 0.50: ... size and mass of each ball size depends on mill load and whether or not the media is being added as the initial charge. ... Bond expressed mill capacity as a function of mill shaft power (PM, kW) and the energy required for particle breakage ...
You also need a rod mill work index to design a ball mill operating on a coarse feed, above about 4 mm. Q1: You design for a typical percentage of critical speed, usually 75% of critical. Then you iterate the mill diameter using a Morrell C-model or equation to get the RPM that corresponds to 75% for that mill diameter.
You need a two-stage solution, first stage open-circuit mill and then second stage closed-circuit mill. First stage, will be broken into two parts as well, you use a Bond rod mill work index for the coarse component of the ore (+2.1 mm) and the Bond ball mill work index for the fine component (-2.1 mm).
ROD MILL General Arrangement-Dimensions. The above dimensions are approximate and for preliminary use only. Right hand mills are shown. For left-hand mills put drive on opposite side. ... These mills may be divided into three types ROD MILLS, BALL MILLS and AUTOGENOUS MILLS. In the first type, the ROD MILL, the ore is …
In this post, we're going to learn more about rod mill. We'll cover it from two aspects: 1. Working principle. 2. Structure. Let's dive right in! 1. Working Principle of Rod Mill. Rod mill is a common equipment for grinding operation in mineral concentrator, which is mainly suitable for rough grinding operation.