DOI: 10.1016/j.mineng.2022.107822 Corpus ID: 252148702; A new methodology to obtain a corrected Bond ball mill work index valid with non-standard feed size @article{Nikoli2022ANM, title={A new methodology to obtain a corrected Bond ball mill work index valid with non-standard feed size}, author={Vladimir Nikoli{'c} and …
New video: The SMC Test versus the Bond Rod Mill Work Index test. Video discusses how these two tests are similar, how they are different, what to be aware of when building a grindability database ...
The Bond work index most commonly referred to is the BBM work index. This value is obtained in a 12" × 12" laboratory mill running at 70 rpm, with rounded inner edges and without lifters. The grinding charge is comprised of a …
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,...
Calculate a Mill's Operating Work Index. Use this online formula to calculate a Ball Mill, Rod Mill or SAG Mill Operating Work Index. Based on Fred Bond's work you can estimate the energy used into your grinding circuit. This is the most accurate and informative method, but much of the data necessary for its application is not yet …
The Bond ball mill grindability test is one of the most common metrics used in the mining industry for ore hardness measurements. The test is an important part of the Bond work …
Once finished the grinding cycles, a minimum of five, the ball mill Bond's work index wi [kWh/sht] can be calculated using Equation (2). In order to express it in metric tons, the corresponding conversion factor must be used. S Ü= 44.5 2 5 4 4. 7· > L. 6· 10 ¥ 2 < 4 − 10 ¥ ( < 4 G (2) where: wi is the ball mill Bond's work index [kWh ...
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 …
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 quick method for Bond work index approximate value determination. D. Todorović Maja Trumić L. Andric V. Milošević Milan Trumić. Engineering, Materials Science. 2016. The Bond work index is a measure of ore resistance to crushing and grinding and is determined using the Bond grindability test.
A new fast way to determine the Bond work index method is proposed to ball mills. • It is possible to determine the work index using a 3 kg sample and 5 min time. • Use only one grind and the population balance model to predict the work index. • The values estimated for SSE are less than 0.4.
Bond ball mill test procedure were carried out on crushed (-3.35 mm / 6 mesh) material at different screen closing sizes (300 µm, 212 µm, 150 µm, 106 µm, and 75 µm). The screening process was
This paper proposes a new method to estimate the Bond Ball mill work index result to decrease experimental time. Four types of ore (limestone, fluorite, …
The self-grinding work index is an extension of the concept of Bond work index. It generally refers to the work index calculated by using Bond's fracture theory on the principle of ore crushing energy consumption according to the W, F, and P data of a small or semi-industrial or industrial self-grinding test. In this kind of test, McPherson …
Dry grinding cycles are performed with circulating load in a laboratory rod mill 12" × 24" with a wave‐type lining, running at 46 rpm. The grinding charge consists of six 1.25" diameter and two 1.75" diameter steel rods 21" long, weighing 33.380 kg.
The derived eqs. 9, 15 and 16 make it possible to abbreviate the Bond test to only two grinding tests. The abbreviated procedure for finding the work index is as follows: (1) The work index is determined from feed crushed to minus 3.327 mm (the same as for the standard Bond test). (2) The feed is screened to determine its size distribution ...
Menéndez-Aguado et al. [17] examined the possibility of determining the work index in a Denver laboratory batch ball mill (Figure 1) with the same inner diameter as the Bond ball standard mill ...
The results showed that using the non-standard mills (between 20 and 35 cm in diameter), the Bond´s model constants (α=0.23; β= 0.82, and γ = 44.5), are unable to predict the Work Index properly. Therefore, these constants must be recalculated using linear models based on mill diameter. With the models proposed for α, β, and γ, the Bond ...
In September, our company received a request to calculate the cost of grinding balls assortment. The composition of the assortment was specified in the request: Steel ball 36.8mm in diameter – 43 pc.. Steel ball with a diameter of 29.7 mm – 67 pc. Steel ball with a diameter of 25.4mm – 10 pc. Steel ball 19.1mm in diameter – 71 pc. …
Nikolić, V., Doll, A., & Trumić, M. (2022) `Determination of the corrected work index when the Bond laboratory grinding test is performed on a coarse or fine sample in relation to the standard ...
DOI: 10.25018/0236-1493--130-145. Comparative assessment of the Bond Ball Mill Work Index tests. L.S. Chitalov, V.V. Lvov. 1 Saint-Petersburg Mining University, Saint-Petersburg, Russia, e ...
Abstract and Figures. The purpose of this research was to statistically evaluate comparative Bond Work Index, BWi, determinations using two different commercial ball mill testing apparatus. These ...
The work index (WI) is a method used to forecast the energy consumption in the ore comminution and make it possible to scale up. This work aims to present the methodology for determining the work index by the ball-mill test through Bond's theory in view of the dissemination of this analysis methodology for industrial processes.
This will give the 250% circulating load. The Bond test takes 7-10 cycles. The test-sieve under size from the last grinding cycle is analyzed by screening. To calculate the work index (Wi) in a laboratory-scale ball mill, Bond first derived the equation: 16 P ⋅ …
US$ 16,000. A Bond Ball Mill, 12" x 12" of fabricated construction comes with electric motor and gear reducer drive, digital counter, jogging button to provide positioning of drum for loading and unloading, emergency stop …
Introduction. The specification for the apparatus to determining a "Bond" rod mill work index is first described in Bond & Maxton (1943). It states that the apparatus is a tumbling rod mill to be operated in a locked cycle test at a fixed circulating load. The geometry of the grinding chamber is described as:
the Bond Work Index (kWh/t) can be rapidly estimated (less than 2 hours) and show a high accuracy for mills of non-standard dimensions (R2= 0.96). Keywords: Bond´s Work Index, rocks grinding, laboratory scale ball mills, ore characterization, non-standard ball mills 1. …
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 …
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 mesh), thus determining the ball mill work index (Wi B or BWi). The work index calculations across a narrow size range are conducted using the appropriate laboratory …
Understanding your ore's variation of work index by size is particularly useful for SAG mill troubleshooting and production forecasting. Examples of the variation in work index at …
As shown in Table 1, little variation existed in the Bond Ball Mill Work Indices and a geometallurgical approach was not used for comminution design. Acetic acid dissolution to determine the ...
