Download scientific diagram | Size distribution of copper sulphide samples after crushing by jaw and roll crusher. from publication: Investigating of the effect of ore work index and particle size ...

Therefore, this measure can be cheaply determined using other rock characteristics. In addition, the value of the BWi determines the energy required for crushing and milling (depends on the BWi type, e.g., crushing work index, Bond ball mill work index, and Bond rod mill work index), and this measure can be used to optimize …

Probability of Crushing Particles in a Jaw Crusher (from Equation ... The models for determining the power required for operating jaw crushers have mostly been derived using Bond's work index. While these gave satisfactory estimations of power, it must be remembered that Bond's expression was derived using a tumbling mill where …

Jaw crusher + HPGR + ball mill Particle weakening by HPGR may be explained by the lower specific energy consumption of the ball mill in the downstream process tha t is 12. 46 kWh/t (a ft er 15 min ...

Mib = Provided by data from the standard Bond ball work index test using the following equation (Morrell, 2006): ... work index than the crusher (ie the ball mill is less energy efficient than a crusher and has to input more energy to do the same amount of size reduction). Hence from equation 7, to crush to the ball mill circuit feed size (x 2 ...

The commonly used grindability tests included in the database are the Bond work indices for ball milling, rod milling and crushing; the drop weight test results A, b, A×b, DWi, Mia, Mic, Mih and ...

c) Bond Crushing Work Index (CWI) d) Bond Abrasion Index (Ai) e) Bond Rod Mill Work Index (RWI) f) Bond Ball Mill Work Index (BWI) g) Hard Groove Index (Hi) a) Unconfined Compressive Strength (UCS - mpa) It is determined from core or sample drilled from rock specimens.The parameters indicate to select the type of primary jaw crusher.

This Table of Ball Mill Bond Work Index of Minerals is a summary as tested on 'around the world sample'. You can find the SG of each mineral samples on the other table. Source 1. Source 2. Source 3. Source 3. Source 4.

Milan Trumić. The Bond work index is a measure of ore resistance to crushing and grinding and is determined using the Bond grindability test. Its value constitutes ore characteristic and is used ...

Pre-treatment of the material to be crushed in order to obtain lower Bond index values (W i). This approach implies the measurement of variations in the Bond Work index values during the pre-treatment of the material to be crushed. The most accepted treatment is related to increasing the number of initial cracks in the particles [4].

4.4 Jaw Crusher Capacity Estimation. The capacity of jaw crushers is a measure of the mass or volume of crushed material produced in unit time of operation. The capacity is primarily a function of: 1. crusher design characteristics such as width and depth of the crushing chamber, 2. open and closed side settings, 3.

x 3 = P 80 (µm) of final grind M ib = Provided by data from the standard Bond ball work index test using the following equation (Morrell, 2006): ()(( )) 80 ( ) 80 0.295 1 80 80 18.18 ib f p P Gbp p f f f M − = (6) where M ib = fine ore work index (kWh/tonne) P 1 = closing screen size (µm) Gbp = net grams of screen undersize per mill revolution

It must be at least 36 in. wide for an 18 x 36 jaw crusher. So a 4-ft by 8-ft screen would be acceptable. The 1-in. screen is a second deck for the 38 tph from the jaw crusher, so the deck correction factor is 0.90 and that screen capacity is 2.1 x 0.9 = 1.89 tph/sq ft. The screen area needed under the jaw crusher is 38/1.89 = 20.1 sq ft.

Bond Abrasion Index Test Machine. The Bond Abrasion Index, devised by F.C. Bond in the 1940's, quantifies the abrasivity of an ore. The index can be used to calculate metal wear rates in crushers and ball consumption rates in ball mills. Category: Comminution Testing Equipment in Mineral Processing.

A single toggle Blake jaw crusher with 22.8 cm × 47.7 cm receiving hopper crushed gold ore at the rate of 85 t/h with closed setting at 2.54 cm and maximum opening of 3.8 cm. The work index of the ore was 13.5 kWh/t. Assuming the SG of the ore was 5.4, calculate 1. optimum frequency of the toggle cycle, 2. maximum frequency of the toggle cycle, 3.

To determine the Bond's work index, the samples were prepared by crushing large lumps of basalt, slate and granite in a dodge type jaw crusher. A gape of 4.8 mm was set in primary stage and 3.6 mm in the secondary stage so as to avoid the extra fine particles. 2–3 pieces of sample lumps close to cubical shape weighing cumulatively …

Starting from the base working principle that compression is the forcing of two surfaces towards one another to crush the material caught between them. Impact crushing can be of two variations: gravity and dynamic. An example of gravity impact would be dropping a rock onto a steel plate (similar to what goes on into an Autogenous Mill).

below the estimate by equation (1), by at ... it is pertinent to note that the Bond work index for . granite is 15.83kWhr/ton [30]. ... Jaw crusher machines are used in the mining and construction ...

The initial sample volume is 207 cm3 instead of 700 cm3; accordingly, the test can be performed on 3 kg instead of 10 kg. The procedure involves dry grinding in a closed cycle until a 250% circulating load is reached. The Bond work index is estimated using Equation. (19).

The required crushing power is a function of Bond work index, capacity and the reduction ratio. Adopting Gupta and Yan [5] the power is given by, P = Q.R d.w i where Q = crushing capacity, Rd = reduction ratio (x 1 /x 2) and wi = work index. In this work Q = .356 t/hr and x 1 = 7.5mm. A roll gap of 5mm had already been specified and x 2

Josefin et al. (2018) gave a correction procedure of the Bond test for closing mesh size which is made of 4 steps, and we could use to correct the work index measured on a sample from one P 80 size to another P 80 size by using calibration sample and suggested correction equation for calculation the BWI.

However, in this situation the ball mill has to supply this energy and it has a different (higher) work index than the crusher (ie the ball mill is less energy efficient than a crusher and has to ...

They crush primarily by using compression. The rock is dropped between two rigid pieces of metal, one of which then moves inwards towards the rock, and the rock is crushed because it has a lower breaking point than the opposing metal piece. crusher is famous product of heavy industry. An important parts of jaw crusher: moving jaw plate.

For the sedimentary rocks (Siltstone) the specific crushing energy is approximately 1.26 kJ/kg. Tosun and Konak (2014) measured power consumption of jaw crusher during crushing of limestone rocks ...

Abstract: The aim of this paper was to determine the impact of physical and mechanical properties of. rocks on the electricity consumption of a jaw crusher du ring crushing. This paper presents a ...

Reduction of data from one type or size of jaw crusher into the equivalent performance of another crusher has been accomplished by ratios of all of the various equation factors involved. The individual u Fig. 3-Dodge-type jaw crusher showing relative swing jaw motion at feed and discharge ends.

Bond's impact method comes from a double mirrored pendulum impact crusher test on <76mm but >51mm (3″ and 2″) square rock pieces. The resulting consumed power is calculated using Bond's standard equation. See how BWi relates to Ai. A Crusher' Settings 3 main parameters are changed to obtained a targeted P80 product …

Table Source: Wikipedia (Crushers) Cone crushers use a spinning cone that gyrates in the bowl in an eccentric motion to crush the rock between the cone surface, referred to as the mantle, and the crusher bowl liner.Gyratory crushers are very similar to cone crushers, but have a steeper cone slope and a concave bowl surface. As the gap …

The work index in Bond's law for crushing of solids has the following dimensions . No units (dimensionless) ... Jaw crushers, Ball mills, Fluid energy mills. Ball mills, Jaw crushers, Fluid energy mills ... 2003-12-mo. Energy requirement (per unit mass of material crushed/ground) is highest for . Jaw crusher. Rod mill. Ball mill. Fluid energy ...

The Bond crushing work index is a measure of material strength and is determined using a simple twin pendulum apparatus and a standard procedure. The Bond impact test attempts to emulate the crushing action that occurs inside the chamber of jaw, cone and gyratory crushers, where particles may not be broken in the first nipping cycle, …