wet overflow ball mill capacity

Tubular Ball Mills

The balls occupied 28% of the mill volume. The mill was rotated at 65% of the critical speed. The work index of the ore was 11.3 kWh/t. Estimate the size of the mill required. 7.7. A wet overflow ball mill of dimensions 3.05 m × 3.05 m was charged with nickel ore (pentlandite) of density 4.2 having a F 80 value of 2.2 mm. The mass of balls ...

Tubular Ball Mills

A mill is required to grind 250 tph of limestone from an 80% passing size of 10 mm to 100 μm in a closed-circuit wet overflow discharge ball mill. Calculate the mill size …

(PDF) Determination of the formal powder filling …

Using the obtained particle size distributions, the reduction ratio based on the 80% passing size was calculated to be 80.5 for the first ball mill, while it was only 1.19 for the second ball mill.

CN104289278A

The invention discloses a wet overflow ball mill, belongs to the technical field of ore grinding equipment, and aims to provide the wet overflow ball mill comprising a feeding part (1), a charging part (2), a cylinder part (3), a transmission part (4), a main bearing part (5), a discharging part (6), a large coupling (7), a speed reducer (8), a small coupling (7), …

Solved Determine the mill capacity for wet grinding …

Mechanical Engineering questions and answers. Determine the mill capacity for wet grinding and dry grinding for a 2X2 meter wet overflow ball mill operating in open …

How an Overflow Ball Mill Works?

The overflow ball mill is mainly used for the wet grinding various ores. In the grinding process, while continuously feeding materials to the mill, a certain amount of water is also continuously fed, so that the …

A study of the exit classification effect in wet ball milling

It is highly unlikely that the parameters of Fig. 1 would apply to a typical wet overflow ball mill of length to diameter ratio of 1.5–2. For this reason, this current paper presents a study of exit classification using literature data [4], [5] for typical ball mills grinding a phosphate ore. ... The technique was then extended to predict the ...

Ball Mills

where an approximate figure for the constant is 3.5 for rod mills, 4.0 for overflow ball or pebble mills and 4.5 for grate discharge ball or pebble mills. ç is …

Autogenous Mill | SpringerLink

The autogenous mill will grind the material to the extent that the content of the particles with particle size <0.074 mm accounts for 20–50% of total quantity of product, and crushing ratio is 4000–5000, which is over 10 times that of ball mill and rod mill.

An overfilling indicator for wet overflow ball mills

Authors: Fengnian Shi. Abstract. The lack of constraints in ball mill capacity in the published ball mill models may result in unrealistic predictions of mill throughput. …

Overflow Ball Mill, Wet Type Overflow Ball Mill

A ball mill with simple structure Capacity 0.17～170t/h Product improvement ... The discharging of wet type overflow ball mill relies on the inclination because of the outlet hollow shaft diameter larger than inlet hollow shaft diameter. When the slurry surface is higher than outlet generatrix, the slurry overflow discharges from the mill

Small Ball Mill

Small Ball Mill Capacity Table. Data based on:—Wet grinding, single stage, closed circuit operation: feed:—(½" one way dimension); Class III ore. All mills:—free discharge, grated type, rapid pulp flow. N. B.—for overflow type mills: capacity 80%—power 83%. Dimensions :—"diameters" inside shell without liners—"lengths ...

An overfilling indicator for wet overflow ball mills

As a third component of the upgraded ball mill model, this paper reports the work on developing an overfilling indicator to limit unrealistic mill capacity predictions for the specific energy-based ball mill model. 2. Mechanism to identify the onset point of overfilling. The slurry residence time is used in this work to identify the onset point ...

Model-based procedure for scale-up of wet, overflow ball mills …

This circuit consists of a ball mill in closed circuit with hydrocyclones. The full-scale ball mill has a diameter (inside liners) of 1.85m. The scale-up procedure shows that the full-scale circuit produces a product (hydrocyclone overflow) that has an 80% passing size of 80 μm. The circuit has a recirculating load of 173%.

What is a wet overflow ball mill and its applications

Large Capacity: Overflow wet ball mills are available in various sizes and can have large capacities, making them suitable for high-capacity mining operations. …

Overflow ball Mill

Ball mill: 7.9 m × 13.6 m double motor driven overflow ball mill with a total power of 2 × 8500 kW. Project Duobaoshan, overflow type ball mill used for copper ore

TECHNICAL SPECIFICATION OF WET BALL MILL …

TECHNICAL SPECIFICATION OF WET BALL MILL EQUIPMENT (SUB ASSEMBLY OF FGD SYSTEM) ... cyclone underflow containing the oversized material is re-circulated to the Wet Ball Mill inlet directly, while the overflow is discharged to the Limestone Slurry …

Horizontal Grinding Mill Overflow Type, Grate-discharge …

Specifications. Note) Capacities listed in the above table are based on tests with ores of Wi-13KWH/MT with wet processing in closed circuit. A : Capacities are based on tests with …

Overflow Ball Mill | Wet Ball Mill | Shanghai YingYong …

Overflow type ball mill is a kind of wet grinding machine, which is the key equipment for secondary grinding. It is named after its feature of overflow discharge, and it has the advantages of high crushing ratio, strong adaptability and large capacity, etc. Usually, It is used to grind ore, coal or other grindable materials with certain hardness.

A comparison of the Bond method for sizing wet tumbling ball mills …

Then the Bond Work Index is calculated, in kilowatt hours per ton, from the formula Il'Itest = (1.10)(44.5)1 j (Pto_=3)(GbP)O.S2 X i0 10 1/x-e, xGT I where p, is the opening of the classifying screen used in the test; xQ7, is the 80%passing-size of the product in micrometers; and xGT the 80%a-size of the original feed, which is near 2000 …

Example 71 the size analysis of a gold bearing ore

It was fed to a wet overflow ball mill of I.D. 1.5 m and ground in closed circuit at 75% of the critical speed. The work index of the mineral was 12.8 kWh/t. ... Mill capacity for dry grinding Solution Mill Capacity for Wet Grinding Step 1 Since the mill size is less than 3.8 m, Eq. (7.46) is applicable: The combined correction factor ...

Coal grinding technology: a manual for process engineers.

This handbook examines the intermediate and fine grinding of coal. Four coal grinding devices - three dry, one wet - are discussed with the appropriate ancillary equipment for complete systems. The mills examined are the: air-swept ball mill, roll or ball and race types of mills, air-swept hammer mill, and wet overflow ball mill.

Overflow VS Grate Discharge Ball or Mill

The cost of a ball mill conversion from overflow to grate discharge is 'fairly' affordable at $65,000 for a 13′ x 15′ mill. ... these field examples you can verify the previous statement that an overflow type of …

Slurry discharge capacity of autogenous and semi-autogenous mills …

The lack of constraints in ball mill capacity in the published ball mill models may result in unrealistic predictions of mill throughput. This paper presents an overfilling indicator for wet overflow discharge ball mills. The overfilling indicator is based on the slurry residence time in a given mill and given operational conditions.

Calculate Ball Mill Grinding Capacity

A) Total Apparent Volumetric Charge Filling – including balls and excess slurry on top of the ball charge, plus the interstitial voids in between the balls – expressed as a percentage of the net internal mill volume (inside liners). B) Overflow Discharge Mills operating at low ball fillings – slurry may accumulate on top of the ball charge; causing, …

Mill power for conical (Hardinge) type ball mills

Thus, taking the value of J wet and inserting J/1.1 for J in the dry ball milling equation 13 gives for wet milling 2 3 0 1 p mp-7.020 · LJ(l-0.937J)pb~c(l-9-io )(1+0.4S~)(l+f) (I ) 4 2 ~C PC 3 This can now be compared directly with the Bond equation for wet overflow cylindrical ball mills by using normal values of Ps =2.6, Pb =7.75 metric ...

AMIT 135: Lesson 7 Ball Mills & Circuits – Mining Mill …

Slurry flow in mills: grate-pulp lifter discharge systems (Part …

The lack of constraints in ball mill capacity in the published ball mill models may result in unrealistic predictions of mill throughput. This paper presents an overfilling indicator for wet overflow discharge ball mills. The overfilling indicator is based on the slurry residence time in a given mill and given operational conditions.

(PDF) Performance optimization of an industrial ball mill …

capacity of the ball mill was underrated against the designed. ... which depends on mill type (i.e. 350 for wet overflow mills). Based on Equation [3], the top size of the media should be.

Model-based procedure for scale-up of wet, overflow ball mills …

Model-based procedure for scale-up of wet, overflow ball mills part I: outline of the methodology ... A two-stage ball milling circuit algebra was employed to predict the capacity, circulation ratio, and size distributions. Comparison of the simulated results and the observed values showed that the model represents accurately the actual milling ...