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QUICK METHOD FOR BOND WORK INDEXAPPROXIMATE …

others in Allis-Chalmers have developed a grinding test in a ball mill in a closed cycle until the establishment of stable recirculating load (Maxson et al., 1933). The Bond work index is a parameter which represents a measure of an ore resistance to grinding. Numerically, the work index represents the energy (kWh/sht)

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Loncor Gold Announces Adumbi PEA With 303,000 oz/year Over

Average annual production of 303,000 ounces of gold over a 10.3 year life of mine within proposed pit shell; ... Bond Rod Work …

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Determination of the Bond work index of binary mixtures by ...

The Bond work index can be determined by many ways, some of them are as follows: with the traditional standard 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 ...

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Size Reduction and Energy Requirement - ScienceDirect

A Bond ball mill work index is then performed on the mill product for the design of SAG-ball mill circuits. This is important because it was found that there was a 1–1.5 kWh/t higher ball mill work index if the –3.35 mm ball mill test feed size is obtained by SAG mill grinding compared with crushing.

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Carmax announces positive results from grindability and ...

Gangue minerals include dominantly plagioclase and quartz along with sericite/muscovite, K-feldspar, and carbonates. Comminution: Bond Ball Mill Work Index (BWI) testing was performed on nine samples. The indices varied from 16.9 to 20.6 kWh/t, with an average of 18.6 kWh/t.

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Magnetite: South Australia's potential

From an ore hardness and comminution perspective, the majority of South Australian magnetite ores have a rock strength classified as soft to medium with Bond crushing work index (CWi) values typically 10–20 kWh/t, abrasion index (Ai) values 0.2–0.6 (majority <0.5) and Bond ball mill work index (BWi) values 11–19 kWh/t.

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WO2009077940A1 - A method of grinding a mineral-containing ...

A method of grinding a mineral-containing ore, which includes grinding the mineral-containing ore in a primary milling process and thereafter fine grinding the mineral-containing ore in a secondary ball-mill. A composite grinding medium comprising a mixture of steel balls and pebbles is used in the secondary ball-mill. The pebbles have an average size which is …

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Mill Bond Index Of Silica Sand - bs-werkzeugbau.de

Bond Work Index Tables (Wi) - Free download as PDF File (.pdf), Text File (.txt) or view presentation slides online. Here there are given tables from various sources for the Bond work index values of mining materials (ores, industrial minerals and rocks). These work indexes can be used for the determination of tumbling mills (rod, ball mills ...

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Average Bond Work Index in kJ/kg for some minerals and ...

Table 4 shows the Bond work indices for some minerals and industrial materials from [25]. Note that the real circuit mills present work indices greater than those in laboratory tests, in a typical ...

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Procedure for determination of ball Bond work index in …

The work index (Wi) is calculated in a laboratory-scale ball mill with Bond equation. The Bond work index has been widely used in designing full-scale mills but the Bond test is rather complex, lengthy susceptible to procedural errors and this is why attempts have been made to abbreviate and simplify Bond test procedure ( Weiss, 1985 ). 2.

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CORRELATION BETWEEN BOND WORK INDEX AND …

the work index depending on the grind size. In this way, work index values are usually obtained for some specific grind size that characterizes the grinding operation to design or under evaluation. This study was carried out in a standard bond ball mill 305 mm x 305 mm size in mineral processing laboratory, in the mining engineering department ...

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Westhaven Gold Corp. - Display

A Bond ball work index test for a composite prepared from the remaining sample mass of four of the six original samples was calculated at about 20 kWhr/tonne. Gravity recovery and screened metallic analyses indicate that there was likely not a presence of coarse "nugget" gold, and that a gravity recovery circuit would not likely be included ...

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bond abrasion mill index test standards

Testwork: Bond abrasion index SAGMILLING. Test name: Bond Abrasion Index Abbreviation Alternate Forms Ai Typical F 80 size Typical P 80 size 19 000 µm n/a Models: Steel wear calculation The Bond Abrasion Index is a measure of how readily a rock sample will wear away steel that comes into contact with it.

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Predicting the overall specific energy requirement of ...

Observed reductions in the Bond ball work index have typically been in the range 0–10%. The equations used in this paper makes no specific allowance for the influence of micro-cracking. However, if HPGR products are available which can be used to conduct Bond ball work index tests on, then M ib values obtained from such tests can be used in Eq. .

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(PDF) A Methodology to Estimate Ores Work Index Values ...

The work index, w, is a parameter which presents the ore grindability and is used in Bond fo rmula. The required energy to break and reduced or es size is …

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(PDF) A quick method for bond work index approximate …

A quick procedure with two grinding cycles for the determination of the Bond. work index approximate value is exactly the same as in the first two …

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A Comparison of Test Procedures for Estimating the Bond ...

The Bond ball work index is widely used in the field of minerals processing as an indicator of ore grindability. The work index is determined by means of a locked-cycle test procedure that typically requires seven to eight cycles to stabilise at a …

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Table of Bond Work Index by Minerals

Table of Bond Work Index by Minerals. Post navigation. Previous. Next. 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 …

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HIGH METALLURGICAL GOLD RECOVERY CONFIRMED AT MT …

There were sulphide minerals present with sulphur grades in the deeper samples ranging from 0.62% as high as 3.3% but they did not present refractory recovery issues in the samples tested. Other potentially deleterious elements such as mercury, tellurium ... • Bond Ball Mill Work Index (BWi) – average 14.6 kWh/t (medium to hard)

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can a ball mill crush dolerite

Table of Bond Work Index by Minerals. Mar 19,, 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, Basalt, 189, 171, 188, 190, 190, Concentrator Manuals/Procedures Crushing & Screening Dewatering Equipment Feeders.

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Orway Mineral Consultants Canada Ltd. Mississauga, ON ...

Bond's approach consists of determining the ore hardness characteristics, or Work Index (Wi) via standardized laboratory testwork. The full suite of Bond comminution tests provide the Ball Mill Work Index (BWi), the Rod Mill Work Index (RWi), the Crusher Work Index (CWi) and the Abrasion Index (Ai).

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Mineral Processing - SlideShare

Wi = The Bond Ball Mill Work index ( 1952 )- is a measure of the resistance of the material to crushing and grinding . A Bond Ball Mill Work Index test may be required for the design of a new mineral processing plant . It is determined by Bond Ball Mill Grindability test in a lab using a Bond Mill.

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Estimating Ball Consumption - Molycop

The work performed included analysis of operating performance data from 49 mills and included extensive determinations of the Bond Abrasion Index for different ore types. For an improved understanding, the wear rate constant is directly related to the grinding media consumption rate expressed in grams of steel per kWh drawn by the mill, using ...

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KOOTENAY SILVER HIRES BLUE COAST RE | Kootenay Silver Inc.

Results from the Program will be used by the Company to advance La Negra along the path towards an initial mineral resource estimate and a preliminary economic assessment (PEA). Work will include: Sample characterization including QEMSACN mineralogy. Bond Ball Work Index test and grind calibration testing.

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SAGMILLING .:. Articles

Correction of Bond Ball Mill Work Index Test for Closing Mesh Sizes It is commonly known that one must run the Bond ball mill work index test such you pick a closing mesh to give a P80 close to desired grind size.

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A comparison of parameter G obtained by the standard Bond ...

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 for industrial ...

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bond work index of grinding ore

Determination of Bond Index of Wasagu Manganese. ABSTRACT. the grinding power required for a given throughput of material under ball mill grinding consitions JKTech Pty, A Bond Ball Mill Work Index test may be required for the design of a, sample of ore that is typical of the proposed feed to the plant.

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Comparison of UCS to Bond Work Indices

FIGURE 6: BOND BALL MILL WORK INDEX v. UNCONFINED COMPRESSIVE STRENGTH 0 100 200 300 400 UCS (MPa) 5 10 15 20 25 30 WiBM (metric) Figure 6 displays the plot of ball mill Work Index (Wi BM) versus UCS. Still no relationship is observed.