bond work index equation for jaw crusher

Bond proposed the following equation for finding the equivalent wet grinding work index (W i) ... The coal sample was crushed in a Retsch Jaw Crusher (Hann, Germany) to 3.35 ... is the grindability (net g/rev). The Bond Work Index (W i) ...

This Grindability Test or Bond Ball Mill Work Index Procedure is used to determine the Bond Work Index of minus six mesh or finer feed ore samples. These equation application methods are used …

The Bond work index (Bond, 1960) is based on Bond's law, ... (Bond, 1985). The equation is commonly written as: ... Air-dried limestone was crushed continuously in a laboratory single-toggle Blake jaw crusher designed to provide a throw of 228 mm. The lower opening close set was 102 mm and the maximum bottom opening was 330 mm.

Probability of Crushing Particles in a Jaw Crusher (from Equation ... The models for determining the power required for operating jaw crushers have mostly been …

Bond's work index, by definition, is the energy required per unit mass to reduce the particle size from infinity to 100 µm. ... Equipment type: Typical efficiency, % Jaw and roll crushers: 70–90: Impact crushers: 30–40: Roller-ring mills: 1–15: Ball mills: 5–10: Impact mills: 1–10 . Wet grinding.

BOND WORK INDEX. The Bond Work Index is a factor that measures the energy consumed in size reduction operation of the ore. The Bond's Work Index equation is: W=WI* (10/√P80 -10/√F80) where. W= the energy input (Work input) per ton, kwh/metric ton. WI= Work Index= specific energy per ton, kwh/metric ton (characterizes the ore)

The traditional Bond work index proposed by F.C. Bond over 60 years ago is still today a useful tool for characterizing material crushability and grindability in the minerals industry.

Appendix, Jaw Crusher: $File/CseriesEnglish.pdf. …

The theoretical work of Rose and English [11] to determine the capacity of jaw crushers is also applicable to gyratory crushers. According to Rose and English, Equation (5.4) can be used to determine the capacity, Q, of gyratory crushers: (5.4) Q = W i D ρ S L M A X − L M I N (L M A X + L M I N) K 2 R R − 1 t / h where W i = Bond's work ...

Primary crushers are designed so that the maximum size that can be presented to the crusher is approximately 80% of the gape. Jaw crushers are operated to produce a size reduction ratio between 4 :1 and 9 : 1. Gyratory crushers can produce size reduction ratios over a somewhat larger range of 3 :1 to 10 :1.

Bond's work index is one of the mostly widely used metrics of mineral grindability. In spite of its ubiquity, users ... Bond's equation is one of a much larger family of equations that includes the classical grindability models of P.R. von Rittinger and E. Kick, according to Hukki (1962). Hukki's conjecture is that the specific energy

The Pendulum Tester / Bond Impact Crushing Work Index Tester. Working principle Crushing by impact. 76 mm maximum feed size. Test repetition: At least 10, preferably 20 test runs. The Bond Crushing Work Index (CWI) describes the competency of the ore at larger particle sizes. It is used for the calculation of the actual crusher power requirements.

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].

The final form of Bond's equation can be written as [4]: (2) E = 10 C W i 1 P 80 − 1 F 80 kWh ton where C = a tabulated constant depending on type and condition …

The specific energy consumption at the motor input can be predicted using Bond's equation: E = 10 × CWi × (P80 – ½ - F80 –½). where CWi is your work index, F80 is the 80% passing size of the feed measured in µm, and P80 is the 80% passing size of the product measured in µm. E is the specific energy in kWh/tonne. Very important -- there …

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 …

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This permits us to determine the efficiency of power utilization in crushers and to predict the product size distribution which will arise from operating crushers at different power rates. The Bond Work Index figures obtained by backcalculation from the pendulum data are compared with the Net Work Index values obtained from the plants …

Determine K, from Equation (4.24) where K = ... Jaw crusher: The material is crushed between a fixed jaw and a mobile jaw. The feed is subjected to repeated pressure as it passes downwards and is progressively reduced in size until it is small enough to pass out of the crushing chamber. ... where W i = Bond's work index. D = diameter of bowl ...

(4) In the source [14] it is noted that the value of specific crushing energy for jaw crushers is within 0.828-1.98 kJ/kg. ...

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 ...

The Bond work index determination according to the standard Bond's test is done on all these samples with compara-tive sieve size of 74, 105 and 150 microns. The Bond Work Index is calculated using the formula (Bond, 1961): (√ √) (1) where: W i – Bond work index (kWh/t); P c – test sieve mesh size (µm);

Estimate Jaw Crusher Capacity. Example capacity calculation of a 10″ x 20″ (250 mm x 500 mm): = 2800 x 0.25 x 0.5 x 0.5 x 225 x (1-0.2)/60 = 525 kg/hr = 13 TPD vs 300 to 420 TPD —> I can't make this work! My friend Alex the SAG Mill Expert, says this equation you picked up doesn't look right.

Bond's equation can be used in a number of useful ways: Process and equipment design can use the equation by inputing the desired feed (F80) and product sizes (P80), …

Jaw Crusher Explained saVRee. If a jaw crusher is rated by jaw plate size a suitable rating maybe 600 x 400 which indicates a 600 mm by 400 mm jaw plate dimension. Sizes may be given in imperial (inches etc.) or metric (millimetre etc.). How Jaw Crushers Work. A jaw crusher uses compressive force for breaking ore pieces.

Title: Bond F.C., 1961. Crushing and Grinding Calculations.pdf Author: can Created Date: 4/2/2009 4:00:03 PM

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P80 = 25400 x Oss x (0.04Wi + 0.40) P80 = 25400 x Css x 7Ecc x (0.02Wi + 0.70) / (7Ecc – 2Css) Where Oss = Open-side setting in inches. Css = Closed-side settings in inches. Ecc = Eccentric throw in inches. P80 = Aperture through which 80% of the …

1.) Obtaining the size or surface area required for the use of the ore or material. 2.) Allowing ease of transportation and storage. 3.) Separating the different minerals contained within the ore and to release them from one another. 4.) Obtaining the size or surface area required for the enrichment stage.

For A; values > 0.15 non-autogenous impact crushers are considered uneconomic and for A, values > 0.7 double toggle jaw crushers are preferred to single toggle crushers. Bond developed a number of correlations between the abrasion index and metal wear in operating plants. Figure 3.20 shows a plot of these relationships.

May 24 32 In a jaw crusher feed is admitted between two jaws set to from a V open at the top To use this equation a work index Wi is defined as the gross energy requirement in kilowatt hours per ton of feed needed to reduce a very large feed to such a size that 80 of the product passes a 100 181 m screen Labels bond bond law bond s law 116 ...