slurry pooling sag mill

LG A mill power equation for SAG mills. Minerals and Metallurgical Processing. Feb 1990 pp57-62. ... This difference is ascribed to the presence of a pool of sl urry that is present on the bottom ... autogenous mill or a mixture in a semi-autogenous mill, as well as the slurry that makes up the operating charge.

Slurry pooling is common in closed-circuit RoM mills, and the detrimental effect of this has been dramatically demonstrated at ALCOA with a mill throughput increase of over 20%. Techniques for calculating the effects of slurry pooling have been developed and a new pulp lifter system designed to give optimal slurry discharge.

SAG mill grate design causing flow restrictions and slurry pooling. Investigation of new grate design is underway. Diagnosis of throughput limiting issues like grate blockages . Results. Control of the SAG mill weight using feed rate has been implemented and controller is being used more frequently. SAG Cyclone pressure control implementation ...

Indeed, if the mill is supplied with more slurry feed than the media interstices can take, the extra material will form a pool of slurry around the toe of the media charge. Tangsathitkulchai [1] hypothesised that for an overfilled mill (see Fig. 1 ), a pool of …

In these circuits the SAG mill is the largest energy consumer. In many engineering ... respect to the slurry pooling detrimental effect on loss of through-put (Powell et al., 2001) and accordingly on the specific energy as was studied by Powell and Valery (2006). The case study mills have

Menacho and Chávez (2008) reported a slurry transport model in SAG mills by using the porous media fluid transport theory. Tupper, Govender, Mainza and Neville Plint (2013) reported a mechanistic model for slurry transport, based on fluid mechanics considerations. Milestones in Mill Mass Transfer

In the mill grinding chamber the addition of slurry was found to lower the charge shoulder and toe positions due to drag forces on the media, as well as produce a large slurry pool above the toe.

This is because by definition overflow mills operate all of the time with a slurry pool. Some idea of how much slurry pooling in an extreme case can cause the power draw of an AG/SAG mill to drop can be gauged by switching the discharge mechanism choice in the model from grate to overflow when predicting the power draw of an AG/SAG mill.

Mill Operators' Conference 2018 29 –31 August 4 Context Objective • Evaluate six liner design for optimal SAG mill performance • Predict liner life (availability) • Determine operating conditions to maximise power draw • Determine onset of slurry pooling • Optimise SAG mill for variable competency • Emphasis on competent ore

In addition to semi-autogenous (SAG) and autogenous grinding mills, the company's offering includes a wide range of slurry pumps and cyclones. For optimal performance, its …

The optimal performance of AG/SAG mills is the key to successful plant operation. All AG/SAG mills using radial or curved pulp lifters suffer from inherent material transport problems such as slurry and pebble pooling, which decrease throughput and increase energy consumption.

GROSS POWER CALCULATOR General This model uses the equations from Morrell s 1993 PhD thesis The Prediction of Power Draw in Wet Tumbling Mills The model is also described in detail in the book Mineral Comminution Circuits Their Slurry pooling causes the power draw in AG and SAG mills to be lower than a mill without a slurry…

SAG Mill Liner Study Adverse effect of slurry pooling on grinding process in SAG mill are fully utilized in grinding the ore grate and pulp lifters . Know More. iron ore slurry ball mill .

"The operator can be alerted when undesirable conditions such as slurry pooling are imminent, reducing the risk of the mill being overloaded. "Estimation and display of steel ball level reduces the need to perform regular manual measurements which require stopping and sometimes entering the mill, and therefore reduces impact on production and ...

sag mill advantages. Optimizing your SAG mill operation Single stage AGSAG mills have to handle large amounts of slurry as they are generally in closed circuit with classifiers whose circulating loads reach as high as 400500 The geometry of radial and curved pulp lifters is such that . Autogenous mill and semiautogenous mill. Get Price

The mill in the left images was Open vs. closed circuit converted from AG milling to RoM ball milling, and the effect on the In a set of work conducted at Morila Gold mine, an AngloGold slurry hold-up is dramatic, with the pooling and stickiness apparent in Ashanti/Randgold Resources joint venture in Mali, the SAG mill was the AG mode being ...

Examples are given of both AG/SAG and ball mills of how the model responds to changes in slurry level. These examples are used to explain the observed phenomena of slurry pooling and the decrease in power draw observed in ball mills after start - up when feed is first introduced into the mill. Keywords: SAG Milling, Comminution

"The operator can be alerted when undesirable conditions such as slurry pooling are imminent, reducing the risk of the mill being overloaded," he said. "Estimation and display of steel ball level reduces the need to perform regular manual measurements which require stopping and sometimes entering the mill, and, therefore, reduces the ...

Also "Significant slurry pooling was observed in the Yanacocha SAG mill during both of the surveys." Grindability test results. Grindability measurements of survey samples are are given as: Bond ball mill work index is reported as: 17.53 kWh/t (106 µm closing screen, assume P 80 =75 µm), 16.52 kWh/t (212 µm closing screen, assume P 80 =155 µm).

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Sag Slurry Pooling - Free download as PDF File (.pdf), Text File (.txt) or view presentation slides online.

As SAG mill sizes continue to increase in both length and diameter, the required volumetric removal rate increases faster than the cross sectional area of the mill. Hence rate of slurry removal can become a throughput constraint for large mills as a pool of slurry will accumulate in the mill (Nicoli et al., 2001, Cleary et al., 2006). However ...

A sand wheel seal for a grinding mill, which in use is internally disposed within said mill. Preferably the sand wheel seal is integrally formed with a mill throat liner wheel and may be releasably secured to a feed end of said mill. The grinding mill may be any one of a Sag, Ag, Ball or Rod mill.

was inspired by slurry pooling issues in the South African style run of . mine SAG mills. They developed a theoretical approach to flow patterns ... the ball load in a SAG mill can change the ...

(PDF) Slurry pooling and transport issues in SAG mills. Sep 1, 2006, M S Powell and others published Slurry pooling and transport issues in SAG mills, grate open area and the position of the apertures were systematically varied and their effect on. Live Chat …

SAG/AG mills for slurry pooling or slurry flow back issues for Mill throughput improvement. p Study of slurry flow through grates to improve the grate wear life. p Study of the material trajectories to determine charge motion inside the Mill to improve material grind quality, liner life, and throughput. Product Design p Study of existing mill liner

Slurry pooling causes the power draw in AG and SAG mills to be lower than a mill without a slurry pool. This phenomenon results in overflow mills usually drawing less power than grate discharge mills that are operating without a slurry pool. This is because by definition overflow mills operate all of the time with a slurry pool.

The classification at the grate for both slurry apertures and pebble ports has substantially extended previous research studies. The results show clear trends in relation to the radial position, aperture size and particle size. The thesis has provided improvements to the previous AG/SAG mill discharge

The mill speed affects the directly product material flowrate from the mill. From technical literature (Apelt, 2007), the total volumetric discharge can be defined as the sum of the discharge flowrate through grinding media and the discharge flowrate through the slurry pool according to equation 1.

Hi - welcome to 911, Turbo Pulp Lifters have been shown to be effective at discharging slurry where other designs have failed. I believe the Cortez gold mine had success with this design after struggling many years with slurry pooling in their SAG mill.

Slurry pooling minimization in the OED Mill is facilitated by a novel grate-supporting spider. The Outotec spider design is conical and mounted to the discharge-end shell flange. This improves structural stiffness and ensures the mill is open all the way to the shell diameter. Hydrostatic pressure is highest at the locations furthest from the ...

The Outotec slurry wheel upgrade is a retrofit sealing solution for the grinding mill feed end. The existing configuration is replaced with a new and improved slurry return system featuring a unique water-wheel design that significantly improves the material containment of the feed ends.

SAG mill geometry and operating conditions three dimensional pilot scale mill, but without the inclusion of any solid charge in Cleary et al. (2004, 2006a). Now we For this demonstration of the DEM-SPH slurry model use a porous media representation of the charge in this we use a traditional 36 0 SAG mill.