- Mon - Sat 8:00 - 18:00
- [email protected]
- 0086-21-58386256
In iron ore beneficiation plant, we should study its grinding work index according to its own ore characteristics and formulate a better set of grinding process parameters. Classification efficiency is a key factor affecting the operating efficiency of the mill.
This video was put together by Joshua Wright and Aldo Vasquerizo as a supplemental lecture for University of Nevada Reno.If you have any questions, need advi...
A ball mill is a drum-grinding unit where balls from solid materials (steel, iron, hard alloys, ceramics, etc) are used. Most common are ball mills, where when the drum rotates and the balls rub against the inner walls, the balls are lifted until the lifting angle becomes bigger than the angle of repose. Then the grinding media are again below.
Starting from the first-order grinding kinetics defined by means of the Bond ball mill, this paper discusses a simplified procedure for a rapid determination of the work index by just two grinding tests. The applicability of the simplified procedure has been proved on samples of copper and Iron ores that are located in Iran.
The Bond work index is one of the most useful and interesting parameters used in designing grinding equipment. However, it must be obtained under restrained conditions, especially in regards to the Bond standard lab mill. The main objective of this study is to show how this index can be obtained using a Denver ball mill, which is present in most mineral …
Table I shows the Bond ball mill work index obtained for the ore samples as well as the iron and silica content in concentrate and tail after LIMS. The concentrate weight recovery was in the order of 50–60%. Furthermore it may be observed that the Bond ball mill work indices for the ore (Wi) varies from 14.6 to 20.9 kWh/t.
Rotary Scrubber. >>Designed to break up alluvial gravels, clays and sand. >>Adjustable rotary speed. >>The water with high pressure flushed the inwall of drum. >>Can accept material up to 230mm. >>The long drum of the scrubber retains material for longer, more vigorous washing for complete separation.
The work index value of two feed size fractions with 80% passing at 3800?m and 5200?m was noted to be 11.85 kwh/t and 9.3 kwh/ton respectively. Ball mill grinding test indicates that dry grinding in open circuit is not efficient and consumes more energy of 88.48kwh/t of ore for grinding 1000/40?m to 80% <40?m size
For more practical calculations using 80% passing the 100 micron mesh, the Bond Ball Mill Work Index (BBMWi) is widely used to measure the grindability of a mineral, described in kilowatt hours per ton (kWh/t). 1 In reference to cement clinker grinding, the following are typical energy requirements: Ball Mills – 38 kWh/t
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.
The Bond Ball Mill Work Index (BBWi) test is carried out in a standardised ball mill with a pre-defined media and ore charge. The Work Index calculated from the testing can be used in the design and analysis of ball mill circuits. The test requires a minimum of 10kg of sample that has been stage-crushed to passing size of <3.35 mm.
(A) Plastic chips are called non-cohesive solids (B) Kick's crushing law is, P/m = K . ln (D̅sa /Ds̅b ) (C) Communition is a generic term for size enlargement operation (D) Energy required in kwh per ton of product, such that 80% of it passes through a 200 mesh screen, is called 'Work index'
2.2. Bench-scale tests. Comminution properties for all samples were determined according to the Bond ball mill work index (BWi), Bond crushability work index (CWi), JK Drop Weight Tests (DWT) and JK Abrasion testing (Napier-Munn et al. 1996).The BWi was determined following the standard test, using a closing sieve of 150 µm.
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 ...
The work index of a particular material is determined in the laboratory by conducting the standard Bond grindability test. Bond developed separate tests for the rod mill and the ball mill. The simplified test method described in this paper is an alternative procedure to the ball mill grindability test.
Source 4: Tenova Bateman mills (AG/SAG, Rod, Ball Mills) Source 5: Doering international Source 6: SME handbook of mineral processing, N.L Weiss Editor, NY 1985. Bond Work Index Tester
For overflow ball mills, the charge should not exceed 45% of the mill volume . For grate discharge mills, the charge should occupy about 50% of the mill volume . Bond developed a relationship that can be used to determine the percent charge by volume as a function of the vertical height above the charge, He, and the radius of the mill, R, i.e.,
The ability to simulate the Bond work index test also allows examination of truncated ball mill feed size distributions on the work index. For grinding circuits where the feed to a ball mill is sent directly to the classifier and the cyclone underflow feeds the ball mill (see Figure 3.10), a question arises as to whether this practice will ...
Practical 1: Title: Ball Milling Objective: To grind the coarse salt to a smaller size by using a ball mill and to obtain the particle size distribution of the initial and the sieved final mixture. Introduction: 'Ball milling is a method used to break down the solids to smaller sizes or into a powder. A…
WORK INDEX •Work Index, Wi, is the gross energy requirement in kilowatt hour per ton of feed (kWh/ton of feed) to reduce a very large particle to such a size that 80% of the product will pass through a 10micrometer, or 0.1 mm screen. •If Dp is in mm, 𝑊𝑖=𝐾 1 𝐷𝑝𝑝 𝐾 = 0.1𝑊𝑖=0.3162𝑊𝑖 I =0.3162𝑊𝑖 1
The grindability of an ore in the process of mineral dressing can be determined by use of the Bond work index (Wi). This index is determined on a laboratory-scale using a Bond ball-mill and by ...
Samples of iron ore were sourced using random method, reference minerals; marble and granite of known weight and iron ore of known weight were ground using the laboratory ball mill grinding machine. 80% passing size for the iron ore marble and granite samples were obtained at 100μm sieve size for the feeds and products.
The work indices of various iron ores in the world were measured. From the values of the work indices of the iron ores, the powers required to grind the iron ores were estimated. And thus, the grindability of the iron ores was investigated. The results obtained are as follows: (1) The work indices of the iron ores are ranged from 6.22 to 17.40.
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) power.
Ball mill testing results indicate consistent, medium-hard to hard material, with an approximately 10% lower hardness profile in mining phase 1 …
Work Index Ball Mill, alluding to the grind ability list of Metals, is utilized to demonstrate the granulating trouble of the material. It is measured by a rule that to compute the work file ball plant in light of yield of every unrest of the factory after the material is ground to an adjusted state by the predetermined plan.
Abstract： In order to verify the effect of crushing modes on grinding speed and Bond ball grinding work index,the grinding dynamics test and Bond ball grinding work index test were respectively carried out by using the jaw crusher product,cone crusher product and high pressure roller grinding product of a magnetite concentrator.The results showed that:①the grinding …
22 Sep 2017 This Table of Ball Mill Bond Work Index of Minerals is a summary as tested on ' around the world Iron ore, unidentified, 13.5, 12.4, 4-31, 118. Get Price; Bond's Work Index Ball Mills - insmart systems. Insmart Bond's Ball-Mill Work Index is a measure of the resistance of the material to grinding in a ball mill.
1989). 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.
iron ore magnetic separator grinding ball mill. Mineral Processing EPC. Xinhai EPC provides services of sample test, mine design, equipment manufacture, etc. for clients, and solves the common problems in plant construction such as budget overrun, schedule delays, unqualified equipment, unclear recovery benefit, disputes of the manufacturers, and unclear responsibility …