bond s work index ball mill manufactuering design

GMSG GUIDELINE: DETERMINING THE BOND …

Stage Ball Mills, or HPGr-Ball Mill(s)) Circuit F80 = 19,300µm P80 = 155µm W Total = 8.56 kWh/t . kWh/t . Bond Test WI's (kWh/t): Rod Mill: Ball Mill: 9.5 kWh/t.8 9 kWh/t . Bond Standard Circuit Work Index: Assume the rod mill Work Index of 9.5 applies from the actual rod mill feed sizeof 19,300 mµ (although some of this work might ideally

(PDF) Determination of work index in a common laboratory mill

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. This …

The bond work index of mixtures of ceramic raw materials ...

The Bond grindability tests were conducted with −3.35 mm dry feed materials in a standard ball mill (30.5 × 30.5 cm) following a standard procedural outline described in the literature (Yap et al., 1984, Deister, 1987, Ipek, 2003).The work indices were determined at a test sieve size of 150 μm (100 mesh).First, quartz, kaolin, and feldspar samples were separately …

Bond Work Index - an overview | ScienceDirect Topics

Ball mill design requires a Bond work index, BWi, for ball mills at the correct passing size; SAG mill design requires an appropriate SAG test, for example, SPI (Chapter 5 ). Flotation design needs a valid measure of kinetics for each sample, including the maximum attainable recovery and rate constants for each mineral ( Chapter 12 ).

ball mill specific energy calculator|Gold Crusher Machinery

How to Size a Ball Mill Design Calculator Formula. 15/05/2015 In this equation, E is the specific energy required for the grind, and F80 and P80 are the sizes in micrometers that 80% of the weight passes of the mill feed and product respectively The parameter Wi, known as the work index of the ore, is obtained from batch bench tests first devised by Bond (1961) The power …

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).

Determination of Bond Work Index of Lucky Cement …

Abstract—The Bond work index is a research methodology, which is widely used for the estimation of power required to grind the materials. Keeping in view the difficulty in determining this index, many alternatives to the standard method have …

Comparison of UCS to Bond Work Indices

FIGURE 8: ROD MILL/BALL MILL WORK INDEX RATIO v. UNCONFINED COMPRESSIVE STRENGTH 100 200 300 400 UCS (MPa) 0 0.5 1 1.5 2 WiRM/WiBM (metric) Siddall et al (1996) identified the ratio of Bond rod mill Work Index and ball mill Work Index as being indicative of an ore's compentency. Figure 8 plots this ratio versus UCS; no trend is apparent ...

Ball Mills - Mineral Processing & Metallurgy

The apparent difference in capacities between grinding mills (listed as being the same size) is due to the fact that there is no uniform method of designating the size of a mill, for example: a 5′ x 5′ Ball Mill has a working diameter of 5′ inside the liners and has 20 per cent more capacity than all other ball mills designated as 5′ x ...

Bond Work Index - an overview | ScienceDirect Topics

Ball mill design requires a Bond work index, BWi, for ball mills at the correct passing size; SAG mill design requires an appropriate SAG test, for example, SPI (Chapter 5). Flotation design needs a valid measure of kinetics for each sample, including the maximum attainable recovery and rate constants for each mineral ( Chapter 12 ).

Operating work index is not the specific energy …

However, Bond Work Indeces are related to the type of equipment to be used (rod mill, ball mill, SAG uses Drop Ball parameter-Kwhr/m3-, so it is more complex than just specific energy consumption ...

Using the Bond work index to measure operating comminution ...

Rowland, C.A., 1978, "Determination and use of operating work indices in controlled grinding circuits–A proposed concept," Mill Operator's Conference and Exhibit, Northwestern Branch, Australasian Institution of Mining and Metallurgy, Mt. Isa, Queensland Australia, June.

ACCURATE, ECONOMICAL GRINDING CIRCUIT DESIGN USING …

Coupled with the standard Bond Ball Mill Work Index Test it is now possible to determine from these two relatively inexpensive laboratory tests, the amount of …

A Method of C alculating Autogenous/ Semi-Autogenous ...

No 1 rod mill/ball mill circuit was operating very efﬁ ciently when comparing the combined operating work indices for both mills with the rod mill and ball mill laboratory work indices. Note, in Figure. 1, that the rod mill product slope is less than 0.5 due to an extra amount of nes present being ﬁ ﬁ ner than 650 μm.

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.

Bond Work Index Formula-Equation

in the design of a grinding circuit. The Work Index is used when determining the size of the mill and grinding power required to produce the required ore throughput in a ball mill. 2. Procedure 2.1. Bond Ball Mill Grindability The sample was crushed to passing 6 mesh (3.35mm), from this a 700 cc volume was measured and weighed to be used ...

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.

Circulating load - SlideShare

Test design Slide 12 Main purpose Maximum Capacity Cost low Energy Size Division Less fines Production Bond's work index 13. Test design Slide 13 Effect of circulating load on Bond's work index The follow figures shown variation in the Bond work index with test sieve size as test results[7].

The Bond Work Index data for the Australian material using ...

Six tests were carefully performed with both mills using the same aggregate rock sample and with the same method of grindability testing based on Fred …

Comparison of the Different Ways of the Ball Bond Work ...

However, this requires a significant amount of ore samples, a lot of labor and the pilot plants. Fred Bond published an article in 1961, which, described the procedure for testing ores for a Bond Ball Index. This parameter is still one of the most demanded tools in the design, evaluation and optimization of ball grinding plants around the world.

Ball Mill Design Calculation Pdf - Krosline

Ball mill design calculation pdf ball mill designpower calculationun 19, 2015 ball mill powerdesign calculation example 2 in example noit was determined that a 1400 hp wet grinding ball mill was required to grind 100 tph of material with a bond work index of 15 guess what mineral type it is from 80 passing inch to 80 passing 100 mesh in closed ...

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 ...

Characteristics of Mae Moh lignite: Hardgrove grindability ...

Bond defined the work index (W i) as the work (kWh per short ton) to reduce particle from theoretically infinite size to 80% passing 100 m. The Bond's formula is derived from an empirical law of comminution with the exponent of 1.5 as followed: E B = 10W i (1/X p,80 0.5 - 1/X f,80 0.5) (1) where E B is the specific energy (kW/STPH), X p,80 is ...

A new approach to the calculation of bond work index for ...

A Bond Work index mill ball charge and closing screen product size distributions for grinding crystalline grains Int. J. Miner. Process., 165 ( 2017 ), pp. 8 - 14, 10.1016/j.minpro.2017.05.011

Application of Operating Work Indices in Autogenous ...

Ball Mill Wio, BWio 8.6 Circuit Wio, OWio 14.6 Bond Ball Mill Work Index, BWi, kWh/t 13.4 Bond Rod Mill Work Index, RWi, kWh/t 18.1 Table 1. Example of AG/SAG Ball Mill Circuit Wio Calculations [1] [2] ABstrAct Optimum use of power in grinding, both in terms of grinding efficiency and use of installed capital, can have a large effect on ...

Metallurgical Engineering – Jet Rom Solution

The Bond Ball Mill Work Index can be used in the design calculations and simulations of a new grinding circuit. A Bond Ball Mill Work Index may also be used in the simulation and optimisation of existing mill(s) and the associated grinding circuit(s). Sample Requirements: A minimum of 10 kg of – 3.35 mm.

1-day Technical Seminar

W = Bond's work index (kWh/t) P 80 = particle diameter of product, 80% passing (µm) F 80 = particle diameter of feed, 80% passing (µm) o The Bond's Work Index of a material, which is commonly used in the British Commonwealth as well as US, is determined in a standard laboratory ball mill but the test is cumbersome to perform.

labtech 3 inde bond ball mill

bond s work index ball mill manufactuering design. Bond Index Ball Mill / Rod Mill BT 100 XL - RETSCH. The grinding jar for the Bond Index Rod Mill is 12″ x 24″ in size and has a wave-shaped design. At least 15 to 20 kg sample material is required to simulate a closed grinding circuit in a ball or rod mill.

Comminution testing - JKTech - University of Queensland

A Bond Ball Mill Work Index may also be used in the simulation and optimisation of existing mill(s) and the associated grinding circuit(s). Sample requirements: A minimum of 8 kg of material crushed to nominally minus 10 mm is preferred. JKTech would stage crush the sample to minus 3.35 mm, as required for the Bond Ball Mill Work Index test feed.

Design, Construction and Performance Analysis of a 5 ...

Since for the ball mill design we are using 80% passing, the required value of C2 for the ball mill will be equal to1.20. C3 is the correction factor for mill diameter and is given as; 𝐶𝐶3 = 2.44 𝐷𝐷 0.2 (3) However, it is important to note that C3 =0.914 vessel used in …

Ball Mill Design/Power Calculation

The basic parameters used in ball mill design (power calculations), rod mill or any tumbling mill sizing are; material to be ground, characteristics, Bond Work Index, bulk density, specific ...

Bond Tests | SGS India

* 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.

Development of a methodology and validation of the ...

Axb: JK Drop Weight Test ore hardness index BBMWi: Bond Ball Mill Work Index C i: Crushing parameter COV: Coefficient of variation DWi: Drop Weight Index DWT: Drop Weight Test E: Young´s modulus of Elasticity Ecs: Specific Comminution Energy E is: Specific input energy F 80: 80% of the feed passing : Proprietary function

MODELING THE SPECIFIC GRINDING ENERGY AND BALL …

21 CONCLUSIONS Continued In the present work, equations were also derived, giving: zthe ball-mill power drawP as a function of its dimensions: internal mill diameter D and length L, zthe ball-mill power drawP as a function of the feed D f (mm) and the product size d (mm), the Bond work index w i (kWh/short ton) and the mill throughput T (short ton/h), zthe ball-mill …