The Journal of The Southern African Institute of Mining and Metallurgy VOLUME 110 NON-REFEREED PAPER MARCH 2010 143 Table I Bond ball mill test results and composition of the LIMS product Ore Concentrate Tail Sample # Wi (kWh/t) Fe% SiO2% Fe% SiO2% …
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and the Bond Ball Mill Work Index Test (GMG, 2016a). The sampling and surveying guideline (GMG, 2016b) provides additional detail on how to collect the required data, and is critical to this analysis. The following required parameters are standard outputs of the SMC Test®: •Miadescribes grinding of coarser material (> 750 µm)
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All aspects of crushing, ore conveying and screening operation and maintenance: Discuss any type of crushers: gyratory, jaw, cone, roll, HPGR, impact, hammer, etc. Crusher liner, lubrication, mantle, bowl, spider and all other components.Ore transportation on conveyor belts and through classification systems such as vibrating screens, grizzlies and feeders.
· Table 2 gives details of the Bond laboratory ball mill. 1320 S. Mormll and Y. T. Man Ball Mill I1_ Fresh feed ~-~ ~_. r~ ~ ~-~ ~ size Screen u/size Ball mill discharge Fig.4 The flowsheet of the Bond ball mill test TABLE 2 Bond ball mill details Diameter (m) Length (m) Speed (rpm) Speed (fr. crit) Ball load (%) Ball top size (mm) 0.305 0.305 70 ...
The Bond Ball Mill Grindability Test is a locked-cycle laboratory grinding test. It provides the Bond Ball Mill Work Index which expresses the resistance of a material to ball milling. This Index is widely used in the mineral industry for comparing the resistance of different materials to ball milling, for estimating the energy required for grinding, and for ball mill scale-up.
The Ball Bond reliability at 1st bond (ball Bond) & 2nd bond (wedge) is very sensitive to any move-ment of the Die or the Substrate/leadframe. So during wire bond operation, the die & the substrate/leadframe must be held rigidly. Next major issue with regards to 1st bond reliability is the
I I'' /It,'' '' N dab COLLEGE of MINES and METALLURGY (A Bromch off Tha Udvcasit~ of Tm) EL [email protected], UEXAS t ''e Volumo XXVIll Apd 119. 1944 Number 4403 52''1 b 1 e P1 1 CATALOGUE -7 1 NUMBER a'' 4; fa 194%19Q4 t ?p Witb h*nnonncomsmts for 1944-11945 *,I I P~bliohed Quarterly by (bm GXlepo of Mluoa and Motallmrgy A Member of the Boutbarn Assoelation of Colleges
Bond tests was prepared by stage crushing 30 kg of the -10 mm sample to pass 3.35 mm. Half of the -3.35 mm material was split out and retained for the 3.35 mm Bond tests, while the other half was screened at 2.36 mm to produce the sample for the 2.36 mm Bond …
The Bond Ball Mill Work index test, first developed by Fred Chester Bond in 1952, is the industry standard approach for grinding circuit design and sizing of ball mills. The Work Index measures the resistance of an ore to grinding and can be used to determine the power required for closed circuit ball …
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Rock Crushers. The size requirement of the primary rock crusher is a function of grizzly openings, ore chute configuration, required throughput, ore moisture, and other factors. Usually, primary crushers are sized by the ability to accept the largest expected ore fragment.
ball milling, Journal of The South African Institute of Mining and Metallurgy (SAIMM), Vol. 104, No10, 597 – 602 2. Johnny T. Kalala, Murray Bwalya, Michael H. Moys, 2005, DEM modelling of evolving mill liner profiles due to wear. Part I: DEM validation. Minerals Engineering, 18, 1386 - 1391 3.
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Southern African Institute of Mining and Metallurgy 65 A Comparison of Test Procedures for Estimating the Bond Ball Work Index on Zambian/DRC Copper–Cobalt Ores and Evaluation of Suitability for Use in Geometallurgical Studies Elizma Ford and Vincent Sithole Mintek, Johannesburg, South Africa Corresponding author: [email protected]
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);
· Abstract. In the present paper, some calculation methodologies applied to the simulation of Bond test in grinding processes were presented. A comparative analysis was made with simulation results, using various methodologies, of the ball mill Bond test based on real values of the work index.
the value of the Bond Work Index can change with particle size. Most industrial ball mills are in closed circuit with a classifier. The interaction between the ball mill and the classifier can change the composition of the material in the mill until equilibrium is reached. Maxson et al. (1934) stated that the minerals in the ore that offer
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* Bond F. C., "Crushing Tests by Pressure and Impact", Trans AIME, Vol 169, 1947, pp 58-66. Bond Rod Mill Grindability Test. The test determines the Bond Rod Mill Work Index which is used with Bond''s Third Theory of Comminution to calculate net power requirements when sizing ball mills*. Various correction factors may have to be applied.
· BOND BALL MILL GRINDABILITY LABORATORY PROCEDURE. Prepare sample to -6 mesh by stage crushing and screening. Determine Screen Analysis. Determine Bulk Density Lbs/Ft 3. Calculate weight of material charge. Material Charge (gms) = Bulk Density (Lbs/Ft 3) x 700 cc/62.4 Lbs/Ft 3. Material charge = Bulk Wt. (gm/lit.) x 700 cc/1000. Calculate IPP ...
The Bond ball mill grindability test measures hardness as an index, regardless of the feed size, so it does not give credit for the additional fines. Therefore, the index itself is ignored in the analysis and the results are assessed in terms of throughput rate or specific energy requirement. The total power for the HPGR system can be compared ...
The Bond work index, W i, is defined in a Bond ball mill on the samples of standard size −3.327 + 0 mm. In practice, it is possible to find materials of non-standard size that are finer than 3.327 mm.
than predicted by Bond, based on the average performance of the plant circuits that Bond correlated with his laboratory testing. This circuit is consuming 89% of the Bond specified (design) circuit energy. 7.2.2 Common Plant Grinding Circuit Calculations 1. Rod-Ball Mill Circuit (Single-Stage Ball …
· The following modified Bond equation was proposed for crushing (Magdalinovic, 1990): Wc = cP A Wi ( cP 10 - cF 10 ) (8) where: Wc - is energy consumed for clinker crushing (kWh/t), Wi - is Bond ball mill work index (kWh/t), Pc -is sieve size passing 80% of the clinker after crushing (µm), Fc - is sieve size passing 80% of the clinker before ...
scavenger magnetic separator, the ball mill in closed circuit with a 75 µm screen, and the product of the ball mill circuit reporting to three stages of LIMS cleaning. The ZRP ore consists of magnetite and haematite, a significant amount of 506 JULY 2014 VOLUME 114 The Journal of The Southern African Institute of Mining and Metallurgy
The Bond ball mill work index test is thought to be additive because of its units of energy; nevertheless, experimental blending results show a non-additive behavior. [18] The SPI(R) value is known not to be an additive parameter, however errors introduced by block kriging are not thought to be significant .
the Bond ball work index test work and the SMC and abrasion test work. The Bond ball work index tests were conducted internally at Usoke R&D Laboratory on core samples selected based on their representativeness of the orebody, and the SMC and abrasion test work were conducted at external accredited laboratories (GEMET, 2017; ROCKLAB,
Comminution is the reduction of solid materials from one average particle size to a smaller average particle size, by crushing, grinding, cutting, vibrating, or other processes. In geology, it occurs naturally during faulting in the upper part of the Earth''s crust. In industry, it is an important unit operation in mineral processing, ceramics, electronics, and other fields, accomplished with ...
MINING AND METALLURGY INSTITUTE BOR MINING AND METALLURGY ENGINEERING BOR is a journal based on the rich tradition of expert and scientific work from the field of mining, underground and open-pit mining, mineral proce-ssing, geology, mineralogy, petrology, geomecha-nics, metallurgy, materials, technology, as well as
· From Bond''s ball sizing formula, the recommended top ball size for this feed was 10 mm. This is the top ball size of Charge 2 (C2), the curve ( ) in Fig. 1, which should have produced the best grind. However, a finer grind was achieved using Charge 1 (C1), indicating that Bond''s equation may not be entirely accurate for small mills and fine ...
· Bond ball mill tests were conducted to measure the grindability of rock. BWI is an intrinsic characteristic of rock grindability, representing the specific energy for grinding rock when the feed size is 6 mesh and the product size is 100 mesh.
Standard drop weight, SMC, and Bond ball work index tests have been conducted to investigate the comminution circuit of a magnetite ore located in Eastern Hebei, China. In addition, simulations based on JKSimMet and Morrell models have been performed to compare the specific energy consumption of various comminution circuits. According to the desired capacity and the ore communition ...
Samples from the Turnagain deposit have undergone extensive small-scale comminution testing including crushing, semi-autogenous grinding (SAG), high-pressure grinding roll (HPGR, via piston press testing), milling (Bond ball and rod), and abrasion. Turnagain material is hard, with a mean Bond Ball Mill Work Index of 19.8 kWh/tonne.