EXTENDED ABSTRACT FOR COMMINUTION '98 CONFERENCE
The Bond ball mill, rod mill, and impact work indices provide industry recognised standards for the determination of ore "hardness" and "competency". The JKTech Dropweight test also provides a determination of competency and can be combined with the autoabrasion test to provide parameters for circuit modelling using JKSimmet.
JK Bond Ball Mill Test - JKTech
an average work index of 15.5 kWh/t. A very broad range of results was received, characterising the 'standard ore' from medium to very hard. A disappointing result considering the reliance on this test globally for design and optimisation. An improved method using less mass compared to the Bond Ball Mill Work Index test.
about smc test rev 1
DWi and point load index (IS50) making it valuable in Mine-to-mill studies as well. For power-based calculations the SMC Test® also provides the comminution indices Mia, Mih and Mic,which are routinely reported when a test is carried out (see Table 1 below). In conjunction with the Bond ball mill work index they can be used to
Comminution | Base Metallurgical Laboratories Ltd.
At Base Met Labs we currently offer key testing: JK Drop-Weight Test (DWT) SAG Mill Comminution Test (SMC) Bond Ball Mill (BWI) Bond Abrasion (Ai) Modified Bond Comparative WI. Levin Test. Point Load. We can also work with other sub-contractors to provide ancilliary comminution testing requirements such as SPI Testing.
HIT – a Portable Field Device for Rapid Testing at Site
superseded JKTech twin-pendulum, the industry standard JK Drop Weight Tester (JKDWT) and ... typically Bond ball mill Work Index and SMC test® / JKDWT A*b (Bond, 1961; Morrell, 2004). Due ... semi-autogenous grinding (SAG) mill feed hardness testing FIG 2 – Comparison of JKDWT A*b values and corresponding A*b estimates
Comminution | Hazen Research
This test determines the Bond Ball Mill Work Index, which can be used with Bond's Third Theory of Comminution to calculate net power requirements for sizing ball mills. The test is a closed-circuit, dry grindability test is run in a standard ball mill, and can be performed at sizes ranging from 595 mm to 37 microns.
CORRELATION BETWEEN BOND WORK INDEX AND …
3- STANDARD BOND TESTS The Bond's standard ball mill is used to determine the work index value of differ ent samples. The Bond work index is defined as the kilowatt-hours per short ton required to break from infinite size to a product size of 80% passing 100 µm. If the breakage
Technical Information - SMC Testing
Bond ball mill work index 17.1 kWh/t . Ball volume ... the standard Bond rod and ball mill tests are followed. ... (JKTech, 2007) and in-house empirical models developed from plant data to …
bond grindability index
· Table 1 Bond mill charge distribution Ball diameter, inch No. of balls Distribution, % 1 ½ 25 8.8 1 ¼ 39 13.7 1 60 21.0 7/8 68 23.9 3/4 93 32.6 The standard Bond grindability test is a closed-cycle dry grinding and scree ning process, which is carried out …
bonds equation crushing - Mine Equipments
Bond Ball Mill Index - JKTech The BBMWI is a measure of the resistance of ... smc test to predict comminution circuit performance can be determined using the data generated by a conventional Bond ball mill work index test ... Comparison of Ore Hardness Measurements for Grinding Mill ... standard Bond crushing, and rod mill ...
bond work index grinding equipment sizing
ball mill sizing with bond method work index base A comparison of the Bond method for sizing wet tumbling. · A comparison is made of the results from a ball mill model simulation with those of the conventional Bond ball mill design method, for a material whose breakage characteristics and Work Index have been determined.
CONTINUOUS IMPROVEMENT AT SENTINEL (WITH REMOTE …
Bond ball work index kWh/t 9.9 – 19.3 JK Drop Weight Parameters (Axb) 34 (20.0 – 118) ... there has been significant ore hardness variability and an overall steady increase in ... been required in the ball mill (i.e., the power utilisation ratio would be smaller), or the grind would be finer (i.e., ...
JKTech Technical Article
• Impact resistance as measured by the JK parameter A*b ranged from a very hard 25 to a soft 118, although the majority were between 30 and 55. • Grindability as indicated by the bond ball mill work index (BWi) ranged from 10–35 kWh/t, with the majority between 15 and 27 kWh/t.
Prediction of Bond's work index from field measurable rock ...
A systematic investigation was carried out to predict Bond's work index using simple field measurable properties of rocks. Tests were conducted on Basalt, Slate and Granite using a laboratory scale ball mill and rock properties namely density, Protodyakonov's strength index and rebound hardness number were determined.
(PDF) Design of the biggest mill in the world
Bond Ball Mill Work Indices. ... All JKTech Power data adjusted ... The testwork was conducted with −25 +4 mm and −8 +4 mm kimberlitic ores of varying hardness.The Hicom mill's …
mineral processing bond wek index - illowafca
Bond ball mill work index test. Sample selection· Inquire Now; Bond Ball Mill Index Test JKTech. Measuring ore grindability in balls mills. The Bond Ball Mill Work Index is a measure of the resistance of the material to grinding in a ball mill. Inquire Now; bond grinding index of clinker crusherasia
(PDF) Design of the biggest mill in the world
Bond Ball Mill Work Indices. ... All JKTech Power data adjusted ... The testwork was conducted with −25 +4 mm and −8 +4 mm kimberlitic ores of varying hardness.The Hicom mill's response was ...
QUICK METHOD FOR BOND WORK INDEXAPPROXIMATE …
micrometers in size. According to the Bond standard procedure, the work index is determined by simulating a dry grinding in a closed circuit in the Bond ball mill to achieve 250% circulating load (Bond, 1949, 1952, 1961). The test is performed on a raw material approximately weighing 10 kg, which coarseness is -3.327 mm.
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.
What Can Go Wrong in Comminution Circuit Design?
• the bond ball mill work indices determinations gave reasonably reproducible results, • significant variation was observed in the measurement of the bond rod mill work index on at least one sample tested, and • large variations in abrasion index and crushing work index were due to variations in the test method across the laboratories.
JKTech - Mining Technology | Mining News and Views Updated ...
JK Bond Ball Mill Test; Our flotation ore characterisation test is the JKTech Floatability Index (JKFi) Test. JK Drop Weight Test and SMC Tests® are licenced to 48 metallurgical laboratories globally. To date, over 55,000 JKTech accredited A x b tests have been completed across more than 32 different commodities.
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.
rod mill index test - leslodges-marseille.fr
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 be done by crushers to achieve a rod mill F80 of 16,000 m) to a rod µ
The MiniBond test: description, calibration and sources of ...
The Bond ball mill work index test has been used for ore hardness characterization for more than 80 years. Nevertheless, the test suffers from significant disadvantages when compared with other characterization methods. It is expensive, labour …
ball mill abrasion test - paul-schad-rossa.de
Comminution 18. 1210 determining the bond ball mill work index with fewer cycles d garcia university of queensland australia g ballantyne jkmrc australia and h liang jktech pty ltd australia 1230 development of a laboratory test for regrinding ball mill or stirred mill circuits.
crushingandscreeningpresentation | Mill (Grinding) | Wear
Bond Ball mill Grindability Grindability Tests The rod mill work Index is also normally distributed with and average and median of 14.8kWh/t It is common to observe difference between the ball and rod mill caused by variation in ore hardness. The test has been mainly used for the design of rod mill or primary ball mills. Bench Scale and Pilot Plant
Comminution service offering Minerals Processing Division ...
TEST WORK qBond Work Index Testing Bond Ball Work Index Bond Rod Work Index Bond Crushability Work Index Bond Abrasion Work Index qJK Tech Testing JK Drop weight Test SAG Milling Comminution Test (SMC) COMMINUTION PILOT PLANT qAG/SAG Pilot Milling Mill dimensions: Ø1.7m x 0.6m length Typical throughput 0.5 -3.5 t/h depending
comparison of ore hardness measurements
bond ball mill work hardness jktech. Comparison of Ore Hardness Measurements for Grinding . Comparison of Ore Hardness Measurements for Grinding Mill Design for the Tenke Project John Starkey1. Bond Work Indices, JKTech, Grinding Mill Design, Database, Ore Hardness Measurements, JK Drop Weight Test, SAGDesign Test . abrasion indices and by ...
CASE STUDIES ON THE EFFECT OF SAMPLE DIMENSIONS ON ...
hardness profile of a project relates versus other projects. Figures 2 and 3 plot the Bond rod mill work index versus the Bond ball mill work index for two different projects. The first project displays a much harder tendency at medium sizes (higher WiRM than WiBM) than the database,
Recent International Concentrator Start-ups Do and Don'ts ...
P80 will affect the ball mill sizing and overall cost of the circuit. 9. Make sure testing laboratories understand the relation of actual grind size requirement and closing screen size for Bond Ball Mill Work Index Sometimes the Bond BM Wi varies testing. dramatically at other than the design product size. A good rule of thumb is to multiply the P