Welcome to Shanghai COR Mining and Construction Machinery Co., Ltd.
The Bond operating work index is in common use for assessment of comminution efficiency. This method was developed for rod and grinding ball mill circuits and is not well suited to AG/SAG mills or the wide range of comminution devices now in common use. Traditional measures of efficiency only consider the net motor power of the drive unit.
Oct 24, 2018· The work index can either be measured in the laboratory (the Bond ball mill work index determination is a common example) or it can be calculated from the operating performance of a milling ...
The first two Grinding Efficiency Measurement examples are given to show how to calculate Wio and Wioc for single stage ball mills. Figure 1. The first example is a comparison of two parallel mills from a daily operating report. Mill size 5.03m x 6.1m (16.5′ x 20′ with a ID of 16′).
-BWI = Bond ball mill work index on SAG ground ore, kWh/ton ground F 80 = 80% passing of SAG ground of the test feed size, microns P 80 = 80% passing from the test product size, microns P cs = Bond closing screen size, microns G pb = Ball mill grindability (average of last three cycles), gr/rev Determination of the SAG and Ball Mill Pinion Energy :
efficiency of the mill approximately 22%. For the mill with lower mill load and higher speed, the power draw of the different lifters also showed a slight difference. The energy requirement of Hi lifter also varied slightly than the other lifters. In this case, the Hi lifter showed improvement in the energy efficiency of the mill approximately ...
using a novel ring mill, a laboratory ball mill, a labora- tory rod mill and the semi continuous process using the same rod mill as described below. In all cases the min- ... A New Approach to the Calculation of Work Index and the Potential Energy of a Particulate Material ...
This paper is concerned with the model of a fully air swept ball mill operating in a raw material grinding circuit. For simplicity, the approach assumes that different components in the feed can be treated as if they all had the same breakage and classification properties.
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 density, desired mill tonnage capacity DTPH, operating % solids or pulp density, feed size as F80 and maximum 'chunk size', product size as P80 and maximum and finally the type of circuit …
Mar 08, 2013· calculation of ball mill grinding efficiency. dear experts . please tell me how to calculate the grinding efficiency of a closed ckt & open ckt ball mill. in literatures it is written that the grinding efficiency of ball mill is very less [less than 10%]. please expalin in a n excel sheet to calcualte the same. thanks. sidhant. reply
two. Results of Bond ball mill tests conducted with closing screens of 75 µm or finer are to be treated with caution. The Bond Work Index relationship has been noted to apply down to approximately 70 m, and perhaps no finerµ, without making qualifications. Calculations: First, calculate the actual Operating Work Index, WloACT-, of the
The aim of this study was to develop a new method for assessing the Bond work index in a ball mill (BBWI), which is based on a first order kinetics present in the Bond ball mill for grinding mineral raw materials (Austin et al., 1981; Ahmadi and Shahsavari, 2009). Theoretical basis of quick procedure
ball mill operatng work index effeciency A more sustainable approach to assessing comminution efficiency The Bond operating work index is in common use for assessment of comminution efficiency This method was developed for rod and grinding ball . Contact Supplier.
The effect of circulating load and classification efficiency on the performance of ball mill circuits is compared to the effect on HPGR circuits. The fundamentals of grinding behavior are also ...
Mill Ball Mill Closed circuit crushing to 16 mm Open circuit 8' dia. rod mill to 1 mm Closed circuit 8' dia. ball mill to P80 um The ore Test Work Index = Circuit Operating Work Index 9 The Standard Bond Circuit Coarse Ore Bins Fine Ore Bins Screen Crushing Screen Classification Rod Mill Ball Mill THIS IS THE REFERENCE BASIS FOR ALL WORK ...
Procedure for determination of ball Bond work index in the commercial operations ... Bond Ball Mill Work Index which expresses the resistance of material to ball milling. ... be used as a guide to ...
In the prerequisite module entitled "Work Index Efficiency", you have learned about work index analysis* to define overall grinding circuit efficiency. In rod milling, you can use work index analysis to relate design and operating variables to overall circuit efficiency. However, you cannot use work index analysis for the same purpose on ball mill
The operating principle of the ball mill consists of following steps. In a continuously operating ball mill, feed material fed through the central hole one of the caps into the drum and moves therealong, being exposed by grinding media. The material grinding occurs during impact falling grinding balls and abrasion the particles between the balls.
Ball mill circuit classification system performance is considered here first because it provides the basis for subsequent characterization of ball mill breakage efficiency. Major design and operating variables in closed circuit ball milling of a specified feed to a desired product size are summarized in Table 1.
Using the Bond work index to measure operating comminution efficiency. Authors; ... King, R.P., Tavaras, L.M., and Middlemiss, S., 1997, "Establishing the energy efficiency of a ball mill," in Comminution ... 1978, "Determination and use of operating work indices in controlled grinding circuits–A proposed concept," Mill Operator ...
Bond Work Index Tests. Grinding Solutions offers a range of Bond Work Index Testing from crushability and abrasion to ball and rod mills. For more information on the tests please see below: Bond Low Energy Impact Test. The Bond Low-Energy Impact test can be used to determine the Crusher Work index (CWi), also known as the Impact Work Index.
The resultant operating work index of the ball mill will vary according to the ratio of the ball mill, rod mill and crushing work index values and for an Andean copper porphyry is typically in the range of 80% of the measured ball mill work index value. Testwork Required. Bond ball mill work index; Bond rod mill work index
created (Rowland, 1976). The ratio of plant operating to ore work index provided a quantitative measure of overall grinding-circuit efficiency. Using this, a metallur-gist could explore whether changing a circuit design or operating variable increased (or decreased) efficiency in the plant. Bond work index analysis is based on energy usage.
A ball mill, a type of grinder, is a cylindrical device used in grinding (or mixing) materials like ores, chemicals, ceramic raw materials and paints.Ball mills rotate around a horizontal axis, partially filled with the material to be ground plus the grinding medium. Different materials are used as media, including ceramic balls, flint pebbles and stainless steel balls.
A quick method for the Bond work index approximate value determination, which is based on the first order grinding kinetics, is presented in this paper. ... the Bond mill operating under the sam e ...
Example 5.2. a. A survey of a SAG-ball mill circuit processing ore from primary crushing showed size reduction of circuit (SAG) feed F 80 of approximately 165,000 µm to flotation circuit feed (cyclone overflow) P 80 of 125 µm. The total specific energy input for the two milling stages was 14.6 kWh t −1.Calculate the operating work index for the circuit.
Grinding in Ball Mills: Modeling and Process Control Vladimir Monov, Blagoy Sokolov, Stefan Stoenchev ... the work index of the material, the mill shaft power and ... depending on the type of the mill, the operating conditions and the type of the material being ground.
Because of this, grinding below 25 μm in a horizontal ball mill is not practicable. The aim of this experimental work was to study the effect of ball size on the feed and product size distributions in a ball mill fine grinding situation. 2. Mill feed/ball size distribution
COR is quite experienced in construction, milling and mining industry. Requirements like customized designs, advanced equipment and faultless services are available.
According to our experience, we list some typical solutions for your reference.
Indonesia is one important market of COR, every year,…
Besides the oversea markets, COR has great domestic…