A Review of Alternative Procedures to the Bond Ball Mill …
Menéndez-Aguado et al. examined the possibility of determining the work index in a Denver laboratory batch ball mill with the same inner diameter as the Bond ball standard mill. The research was performed on the size class of −3.35 mm using samples of gypsum, celestite, feldspar, clinker, limestone, fluorite, and copper slag.
Bond Work Index
The ball mill work index laboratory test is conducted by grinding an ore sample prepared to passing 3.36 mm (6 mesh) to product size in the range of 45-150 µm (325-100 …
Grindability of binary ore blends in ball mills
It is also reported that the work index of the harder component has the greatest influence on the work index of the mixture (Csőke et al., 2013; Tavares and Kallemback, 2013). This is because the harder component is the main material comprising the circulating load in the locked-cycle Bond ball mill test.
Compare and Understand Rod/Ball/Impact-Crushing/Abrasion BOND Work Index
The three tests are: The Bond ball mill work index (Wi BM, or BWi) conducted from a feed size of approximately 2 mm to a product size on the order of 100 µm. The Bond rod mill work index (Wi RM, or RWi) conducted from a feed size of approximately 10 mm to a product size on the order of 1 mm. The Bond crushing …
BOND'S WORK INDEX: WHAT IT IS AND WHAT IT ISN'T
The reason for this variation in ball mill work index is because the ore at Mt. Milligan has an intrinsic exponent of –0.45 in the 100 µm to 200 µm size range, not the –0.50 exponent empirically measured by F. Bond. The work index increase between 100 µm and 76 µm is due to a porphyritic grain size that causes a spike in energy
A Review of Alternative Procedures to the Bond Ball Mill …
Clinker 200 12.36 12.25 +0.89. ... estimation of the Bond work index when the standard Bond ball mill is not available and. are faster procedures with a reduced number of grinding steps. The ...
(PDF) Estimation of the Bond grindability index from chemical analysis
Portland clinker, should not exceed 5%. ... dressing can be determined by use of the Bond work index (Wi). ... a laboratory-scale using a Bond ball-mill and by simulating dry grinding in a closed ...
Bond Work Index Procedure and Method
BOND Work Index Calculations: Calculate the average value of the last three cycles Net/Rev; Record the value. The Work …
Grinding work index according to Bond
The work index (Wi) expresses the kWh required to reduce a short ton of material from theoretically infinite feed size to 80 % passing a square …
Product size distribution function influence on interpolation
Differences up to 6,2% in the Bond ball mil work index can be observed due to different siz distribution in P 80 calculation.. 13 ores were tested using the Bond ball mill grindability test, obtaining P 80 using different interpolation functions. Rosin Rammler's model showed the best behavior, so its use must be not only suggested, but …
International Journal of Mineral Processing
The Bond work index can be determined by many ways, some of them are as follows: with the traditional stan-dard method in a (1) Bond-ball mill or in a (2) Hardgrove mill with the conversion of the Hardgrove method's result to Bond work index by an empirical formula, (3) with the more work-saving Karra algorithm (compared to the standard Bond ...
Cement grinding optimisation
energy consumed for clinker crushing (kWh/t) W i. Bond ball mill work index (kWh/t) P c. sieve size passing 80% of the clinker after crushing (μm) F c. sieve size passing 80% of the clinker before crushing (μm) A. is an empirical coefficient, dependant on clinker and crusher properties
A Review of Alternative Procedures to the Bond Ball Mill …
Keywords: grindability; comminution; Bond work index 1. Introduction Determining the Bond index using the Fred Bond method [1,2] is considered the state‐of‐the‐art …
A Review of Alternative Procedures to the Bond Ball Mill …
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 …
A Review of Alternative Procedures to the Bond Ball Mill …
A very focused and highly relevenat contribution to the area of ball milling and grandibility. The review suggests that a spell/grammar check be conducted prior to final submission. Author Response. R: A very focused and highly relevenat contribution to the area of ball milling and grandibility.
Testwork: Bond ball mill work index
Bond models, SGI, Morrell Mi. The Bond ball mill work index is one of the most commonly used grindability tests in mining, and is often referred to as the Bond work index . The test is a 'locked-cycle' test where ground product is removed from test cycles and replaced by fresh feed. The test much achieve a steady-state before completion.
Bond Work Index Formula-Equation
Basic Equations. The basic work index equation is: W = 10 Wi/√P – 10 Wi/√F…………………………………………………………………………
Variability of the Ball Mill Bond s Standard Test in a Ta …
Once finished the grinding cycles, a minimum of five, the ball mill Bond's work index w i [kWh/sht] can be calculated using Equation (2). In order to express it in metric tons, the corresponding conversion factor must be used. wi = 44.5 P0.23 100 gbp0.82 p 10 P80 p F80 (2) where: w i is the ball mill Bond's work index [kWh/sht];
Bond Work Index (Energy equation)
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).
Bond Rod Mill Work Index Equipment & Apparatus Review
Commentary on the apparatus of the Bond rod mill Work Index by Alex Doll December, 2015 alex.doll@sagmilling The Bond "Third Theory" of comminution was originally divided into three size classes reflecting the varieties of comminution equipment common during the time period when Bond (and his collaborators) were …
Standard Bond Ball Mill Grindability Test Method-Procedure
Here is the old Allis-Chalmers Bond Work Index Grindability Test Procedure. The standard feed is prepared by stage crushing to all passing a 6 mesh sieve, but finer feed can be used when necessary. It is screen analyzed and packed by shaking in a 1000-cc graduated cylinder, and the weight of 700 cc is placed in the mill and ground …
bond ball mill work index clinker
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Table of Bond Work Index by Minerals
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 …
Secrets of the Bond Ball mill grindability test
Josefin & Doll (2018) published an algorithm to correct ball mill work index results to a different P 80 size basis to what was observed in the laboratory test. The method requires a reference sample that has at least three ball mill work index determinations at three different closing sizes. The reference sample provides a Hukki exponent, -α,
Determination of the Bond work index of binary mixtures by different
Section snippets Apparatus and methods. Traditional Bond ball mill (Ø305 × 305 mm) and Hardgrove mill were used for the measurements.The traditional Hardgrove Grindability Index (HGI) was determined by using the following equation: HGI = 13 + 6.93 m P where m P means the mass of product particles finer 75 μm in grams. From this …
Procedure for determination of ball Bond work index in …
Section snippets Grinding kinetics in the Bond ball mill. Tests of grinding kinetics in the Bond ball mill (Fig. 1, Fig. 2) has shown that over a shorter grinding period, the process follows the law of first order kinetics R = R 0 e-kt where R = test-sieve oversize at the time (t); R 0 = test sieve at the beginning of grinding (t = 0); k: grinding rate …
Bond Work Index Test Ball Mill
The FC Bond Work Index Test Ball Mill was designed by F. C. Bond for use in determining the Bond Index, a measure of grindability and power required for grinding applications. The FC Bond Mills are used in laboratories throughout the world. A copy of Fred C. Bond's Method of Crushing and Grinding for determination of the Bond Index is …
bond ball mill work index clinker
ball mill design for quartzpdf design of ball mill for quartz trendyinteriorsin. designs of grinding mill for quartz, images of New Design Ball Mill for Cement Clinker Product Jiangxi Henghong ... 255 35 255 13 13 3 25 4 8 1 3 25 3 25 10 10 13 13 35 255 13 3 6 3 15 15 15 5 35 350 350 350 350 350 35 3 10 10 17 3 35 20 20 20 18 18 18 18 3 3 3 3 ...
Rod Mill Work Index Table
Here is a list presented in table form of Rod Mill Work Index as tested/presented by SME handbook of mineral processing, N.L Weiss Editor, N.Y. 1985. ... Cement clinker: 12.1: 8-15: 29: Cement (raw) 12.3: 4-18: 115: Chrome ore: 7.9: 7-9: 2: Clay: 12.5: 6-18: 4: Clay calcined: 7.0 ... Rapid Determination of Bond Rod-mill Work …
Elaboration of nomograms of properties and implementation of Bond work
In this study, the milling of clinker was evaluated by varying the mill speed (24 and 72 RPM), residence time (3 and 5 hours) and grinding media load (30 and 40 %) in a ball mill.