how to differentiate primary ball mill and secondary ball mill

Ball mills with a drum length to diameter ratio greater than 1.5 are referred to as tube mills. Ball mills may be primary or secondary grinders. Primary grinders are fed from crushers such as a jaw crusher. Secondary grinders are fed from other grinders e.g. a rod mill. See more

The circulating loads generated in a typical ball mill cyclone circuit contain a small fraction of bypassed fines. The concept that high circulating loads will result in overgrinding can be refuted by regarding increases in circulating load in the same vein as multistage grinding. That is, for every incremental increase in circulating load of ...

An option to do both can allow balancing the primary and secondary milling sections by having the ability to return crushed pebbles to SAG feed as per a conventional flowsheet, or to the SAG discharge. …

Calculate the CSE as the average: (80.7 + 73.5) ÷ 2 = 77.1% + 75 μ. In this example the ball mill circuit classification system efficiency is 77.1 per cent at 75 μs. This means that …

Application area :- Primary/ Secondary Ball Mill / Regrind Mill, FAG / SAG Mill . Description:-"Depending on the duty condition, selection of metal … Oriental-Ball Mill,Ball Mill For Sales,Price List,Manufacturer

Based on his work, this formula can be derived for ball diameter sizing and selection: Dm <= 6 (log dk) * d^0.5 where D m = the diameter of the single-sized balls in mm.d = the diameter of the largest chunks of ore in the mill feed in mm. dk = the P90 or fineness of the finished product in microns (um)with this the finished product is ...

Generally, filling the mill by balls must not exceed 30%–35% of its volume. The productivity of ball mills depends on the drum diameter and the relation of ∫ drum diameter and length. The optimum ratio between length L and diameter D, L: …

Both mills differ in terms of the efficiency of grinding. Ball Mills have a higher degree of efficiency than SAG Mills due to their smaller size and have more area for grinding particles, leading to faster grinding. On the other hand, SAG Mills have a larger and deeper drum that provides larger lifting force which increases grinding efficiency.

The approximate horsepower HP of a mill can be calculated from the following equation: HP = (W) (C) (Sin a) (2π) (N)/ 33000. where: W = weight of charge. C = distance of centre of gravity or charge from centre of mill in feet. a = dynamic angle of repose of the charge. N = mill speed in RPM. HP = A x B x C x L. Where.

Keywords: Ball mills, grinding circuit, process control. I. Introduction Grinding in ball mills is an important technological process applied to reduce the size of particles which may …

Open Circuit Primary Ball Mill + Closed Circuit Secondary Ball Mill with Cyclone. These circuits have been getting more and more complex. This is because the ore and the required grind has been getting more and more complicated. The ore in the first one was the softest and the grinding wasn't critical. In the second one the ore was probably ...

In this article, the four main application areas of Retsch laboratory ball mills in battery technology will be outlined. Each area can be categorized under specific application examples: Section 1: Reduction of the material particle size in batteries. Section 2: Mixing and coating of particles.

mill. As such, primary ball mills should be designed with the rod mill work index, and single-stage ball mills should be with both the rod mill and ball mill indices. This is …

mill. As such, primary ball mills should be designed with the rod mill work index, and single-stage ball mills should be with both the rod mill and ball mill indices. This is because it is common to observe a difference (sometimes significant) between the rod mill and ball mill index values for a given ore type (McKen, Verret, & Williams, 2006). On

The Function of a Ball Mill . To perform its functions, the ball mill operates on the principle of impact and attrition. This principle entails that the balls are dropped from near the top of the shell in order to bring about size reduction impact. The major components of the ball mill include a shell that is hollow and is suspended on its axis ...

The 24' x 39.5' Ball Mill The Copper Mountain ball mills are 7315 mm [24 feet] in diameter and 12040 mm [39.5 feet] long. They are overflow discharge ball mills with inside diameters of 7315 mm [24 feet] and grinding lengths of 11887 mm [39 feet]. Each Ball mill is also driven by two 8,500 horsepower ABB motors. Read On

Typically R = 8. Rod Mill Charge: Typically 45% of internal volume; 35% – 65% range. Bed porosity typically 40%. Height of bed measured in the same way as ball mills. Bulk density of rods = 6.25 tons/m3. In wet …

8.3.2.2 Ball mills. The ball mill is a tumbling mill that uses steel balls as the grinding media. The length of the cylindrical shell is usually 1–1.5 times the shell diameter (Figure …

SAG mills are distinguished by utilising run-of-mine (RoM) feed as grinding media with 5 – 18% steel balls added to supplement grinding media. In recent years, RoM Ball mills have started taking ...

mills instead. Often an existing plant that observes their SAG mill is limiting throughput, but the ball mills are under-loaded can open-circuit the primary mill to better balance the grinding load with the secondary mill. The coarse …

The designs of autogenous and semi-autogenous (SAG) grindings mills are described followed by the description of their methods of operation in grinding circuits …

2. Grinding medium. Rod mill commonly uses steel rods with diameter of 50-100mm as grinding medium, while ball mill uses steel balls as grinding medium, and the difference of grinding medium is the main difference between them. The steel balls of ball mill are in point contact with each other, while the steel rods of rod mill are in line ...

Keith Liddell Mintek 75 A " Open circuit primary ball mill grind 40 . 75ųm " Open circuit secondary ball mill with 2 stage cycloningof mill feed grind 80 China New Sale Primary And Secondary Grinding Stage Ball Mill Used In Ore China new sale Primary And Secondary Grinding Stage Ball Mill Used In Ore /Live Chat

The largest SAG mill is 42' (12.8m) in diameter, powered by a 28 MW (38,000 HP) motor. A SAG mill with a 44' (13.4m) diameter and a …Mar 30, 2016· The mine's original grinding circuit consisted of ball mills exclusively. The primary stage comprised 5 ball mills, the secondary stage 3 ball mills, and the final, tertiary stage 2 ball mills.

The Tower mill is filled to a level with grinding media until developed power equals 80% of motor nameplate rating. The Tower mill has a definite use in comminution. It can be used for: secondary grinds following ball or rod mills; regrind circuits; preparation of limestone slurry for flue gas de-sulfurization;

1. SAG mill is the primary tool for grinding. SAG mill is used before the other mills. Ball mill is a secondary, and it is used after the SAG mill. 2. SAG mill breaks the raw material into pieces for the further grinding. Ball mill is used to grind the pieces of raw material into. powder-like structures. 3.

Aug 31, 2018· Karara Mine has decided to shift the comminution workload from the primary ball mill to the TowerMill circuit by bypassing the 100 µm fine screen in between the ball mill and TowerMill circuits. This action has increased the circuit feed particle size distribution with a top size close to 1mm.

5. The size of the ball mill is large, and it is necessary to carry out lifting work during the process of replacing the ball mill liner. The hoisting ball mill liner is the …

glass and it is used after the sag mill. 2. sag mill breaks the raw material into pieces for the further grinding. ball mill is used to grind the pieces of raw material into ...Ball Mill For Ore Primary And Secondary Grinding Plant. Ball Mill Explained Savree. If a ball mill uses water during grinding,

In ball mills, steel balls or hard pebbles to break particle based on impact and attrition A rotating mill charged with media and ore is lifted against the inside perimeter For primary grinding, the ratio could vary between 1:1and 18:1 For fine regrinding in open circuit, the ratio ranges from 13:1 to 15:1The rod mill was converted to a primary ...

process. Together with ball charge composition, both tools – liners and media – can be optimally adjusted for the application. They can then fulfil the Figure 2: ball mill tools and …

Difference between open circuit and closed circuit grinding. ... It used to be the practice at one time to omit the first classifier and to pass the feed straight through the primary mill to the secondary circuit, but it was not a good method because either the secondary mill received pieces of ore that were too big or else the primary mill ...

According to the particle size effect of the finished product. The product particle size is 1~3mm. When used for rough grinding, choose a rod mill. The product particle size is less than 0.5mm. When used for fine grinding, choose a ball mill. The product of the rod mill is rougher but more uniform than the ball mill's.

how to differentiate primary ball mill and secondary ball … secondary crusher and ball mill. … and industrial grinding mill etc. Our jaw crusher is a good primary crusher, our impact crusher is widely used as secondary …

One of the advantages of a rod mill is that it can handle a higher capacity than a ball mill of the same size. Additionally, the grinding medium in a rod mill is more uniform than that in a ball mill, and this can be beneficial for certain materials. Rod mills are also relatively low-maintenance, making them a cost-effective option for many ...