pressure grinding rolls versus sag mills

Work Index Determination for High Pressure Grinding Rolls

TO DETERMINE WORK INDEX FOR HIGH PRESSURE . GRINDING ROLLS . ABSTRACT. The use of High Pressure Grinding Rolls is gaining significant interest as a replacement for SAG milling in the . comminution of hard rock ores because of the potential for reduced costs in terms of energy and grinding ball consumption.

What is the difference between a SAG mill and ball mill?

SAG is an acronym for semi-autogenous grinding. SAG mills are autogenous mills that also use grinding balls like a ball mill. A SAG mill is usually a primary or first stage grinder. SAG mills use a ball charge of 8 to 21%. [6] [7] The largest SAG mill is 42′ (12.8m) in diameter, powered by a 28 MW (38,000 HP) motor. [8] A SAG mill with a 44 ...

Model:Bond HPGR and ball mill - SAGMILLING

HPGR and ball mill circuit. This is a highly experimental model. Use at your own risk! The high pressure grinding roll (HPGR) and ball mill circuit can be thought of as a variation on the classical single stage ball mill (SSBM) circuit with the …

SAGMILLING .:. Articles

SAG power draw survey tabulation. This LibreOffice spreadsheet contains the raw data used to create Table 1 and Table 2 of the paper "An updated data set for SAG mill power model calibration", presented at IMPC 2016 in Quebec City, Canada in September, 2016. Refer to the paper for the definitions and meanings of the different columns.

Improved characterisation of ball milling energy ...

This paper describes a method for assessing the downstream milling energy requirements for high pressure grinding rolls (HPGR) products based on a Bond mill test procedure. Multiple trade-off studies have reported the performance of HPGR versus SAG milling with energy savings of between 11 and 32 per cent.

SAG Mill Grinding Circuit Design - 911metallurgist

AG mills (or SAG mills with low ball charges) are often used in single-stage grinding applications. Based on their higher throughput and coarser grind relative to AG mills, it is more common for SAG mills to he used as the primary stage of grinding, followed by a second stage of milling. AG/SAG circuits producing a fine grind (particularly ...

grinding will hpgr replace sag mill and vertimill displace ...

High Pressure Grinding Rolls Versus Sag Mill Pitcairn. of the energy requirements of HPGR and SAG mill circuits in hard ore applications by P Rosario† and R Hall† Synopsis The application of high pressure grinding rolls HPGR has been growing in the mining industry for the last 10 to 15 years The major benefits .

HPGR Versus Sag Mill Selection For The Los Bronces | Mill ...

The development of the Los Bronces mine affords the opportunity to assess the use of High Pressure Grinding Rolls as a viable alternative to a SAG mill for ball mill feed preparation. The high pressure grinding rolls (HPGR) is a relatively new comminution device that offers realistic potential in dramatically reducing comminution energy ...

A simple estimation method of materials handling specific ...

Tradeoff studies of multistage crushing plants involving high pressure grinding rolls (HPGRs) versus semiautogenous grinding (SAG) mill circuits typically focus on the operating cost savings of crushing plants versus the capital cost savings of SAG mill plants. Very highlevel (or desktop) ...

Using the SMC Test revised

• High Pressure Grinding Rolls (HPGR) POWER-BASED EQUATIONS General The approach divides comminution equipment into three categories: • Tumbling mills, eg AG, SAG, rod and ball mills • Conventional reciprocating crushers, eg jaw, gyratory and cone • HPGRs Tumbling mills are described using 2 indices: M ia and M ib

grinding rolls mills - psp3.eu

Roller mill - Wikipedia 23-09-2009 Roller mills are mills that use cylindrical rollers, either in opposing pairs or against flat plates, to crush or grind v

(PDF) Effects of high pressure grinding rolls on platinum ...

in operating costs compared to conventional circuits AG/SAG mills. ... The high-pressure grinding roll was introduced about 10 years ago and has established itself in …

Improved characterisation of ball milling energy ...

Abstract. This paper describes a method for assessing the downstream milling energy requirements for high pressure grinding rolls (HPGR) products based on a Bond mill test procedure. Multiple trade-off studies have reported the performance of HPGR versus SAG milling with energy savings of between 11 and 32 per cent.

SAG Mill Grinding Circuit Design - 911metallurgist

In broad terms, this makes SAG mills less expensive to build (in terms of unit capital cost per ton of throughput) than AG mills but more expensive to operate (as a result of increased grinding media and liner costs, and in many cases, lower power efficiency).

Technology Development in the Copper Industry

High Pressure Grinding Rolls (HPGR)High Pressure Grinding Rolls (HPGR) Cerro Verde milling circuit incorporates high pressure grinding rolls (HPGR) instead of SAG mills - 108,000 mtpd - Four 2.4 x 1.6 m HPGR's Advantages vs. SAG mills - Greater total energy efficiency - 2.4 kWh/t vs. 12.0 kWh/t

Energy and Cost Comparisons of HPGR-based Circuits | E & MJ

A comprehensive energy and cost study compared an existing SAG mill-based circuit at the Huckleberry mine with two proposed circuits involving comminution technologies that are associated with energy efficiency: high-pressure grinding …

"Lessons Learned from the Copper Industry Applied to Gold ...

High Pressure Grinding Rolls •Cerro Verde milling circuit incorporates high pressure grinding rolls (HPGR) instead of SAG mills –108,000 mtpd –Four 2.4 x 1.6 m HPGR's •Advantages vs. SAG mills –Improved energy efficiency •2.4 kWh/t vs. 12.0 kWh/t –Greater flexibility –Lower unit cost •Disadvantages vs. SAG mills

High Pressure Grinding Roll for advanced crushing |FL

High pressure grinding roll - saving energy and providing results. The HPGR truly is a unique comminution product. It weakens rock structure and exposes ore particles, making it an attractive option for heap leach applications.

COMPARISON OF HPGR - BALL MILL AND HPGR - STIRRED …

In the past 20 years, the energy-efficient comminution technologies, including high pressure grinding rolls (HPGR) and high speed stirred mill, have been developed and adopted in the hard-rock mining operation in order to reduce the energy consumption and …

Why HPGRs did not make the list? - LinkedIn

A typical HPGR circuit flowsheet consists of one or more secondary crushers, high pressure grinding rolls, ball mills and ancillary equipment …

A Simple Estimation Method of Materials Handling Specific ...

"Multi-stage crushing plants, including high pressure grinding roll (HPGR) circuits, require more materials handling equipment than SAG and ball mill circuits. ... (SAG) mill circuits typically focus on the operating cost savings of crushing plants versus the capital cost savings of SAG mill plants. Very high-level (or desktop) studies of this ...

PACIFIC BOOKER MINERALS INC

This report is a trade-off study to evaluate the application of High Pressure Grinding Rolls (HPGR) as an alternative technology to the conventional semi-autogenous grinding (SAG) milling process for the Morrison Project. The processing plant is designed to operate at 30,000 t/d capacity with an availability of 92%.

HPGR - CEEC (Coalition for Eco Efficient Comminution)

Significant improvements in design and wear abatement technology combined with escalating energy and steel media costs are making High Pressure Grinding Rolls (HPGR) increasingly attractive for applicable "hard rock" ore applications relative to SAG-Ball milling. In addition, HPGR offers significant...

high pressure grinding rolls versus sag mills

MICROCRACKING VERSUS THE PHANTOM CYCLONE; COMPARING SAG. Both Semi-Autogenous Grinding (SAG) mills and High Pressure Grinding Rolls (HPGRs) create more product fines than cone crushers or rod mills Many recent HPGR papers claim benefits of these additional fines (often referred to as "microcracking") when comparing to "standard" circuits …

(PDF) Uses and benefits of laboratory-scale HPGR tests.

Both Semi-Autogenous Grinding (SAG) mills and High Pressure Grinding Rolls (HPGRs) create more product fines than cone crushers or rod mills. Many recent HPGR papers claim benefits of these ...

WO2009077940A1 - A method of grinding a mineral-containing ...

A method of grinding a mineral-containing ore, which includes grinding the mineral-containing ore in a primary milling process and thereafter fine grinding the mineral-containing ore in a secondary ball-mill. A composite grinding medium comprising a mixture of steel balls and pebbles is used in the secondary ball-mill. The pebbles have an average size which is …

Flowsheet considerations for optimal use of high pressure ...

Predicting the overall specific energy requirement of ...

In a previous paper (Morrell, 2008a) an approach was described which enabled the specific energy of tumbling mills such as AG,SAG and ball mills to be estimated from laboratory-derived ore characterisation data. The following paper extends this approach to encompass jaw, gyratory and cone crushers as well as High Pressure Grinding Rolls.

Lumina Gold Announces Improved Flow | Lumina Gold Corp.

The first study evaluated the addition of secondary crushing and high-pressure grinding rolls ("HPGR") to replace the semi-autogenous grinding ("SAG") mills that were contemplated in Lumina's June 2018 Preliminary Economic Assessment (the "2018 PEA"). The second trade off study evaluated the addition of a Carbon-In-Leach ("CIL ...

Technical Information - SMC Testing

Figure 3 – Measured vs Predicted Specific Energy for High Pressure Grinding Rolls. BACKGROUND. The SMC Test® is a precision test that uses either crushed rock pieces that are very closely sized (so-called crush and select method) (Figure 4) or particles that are cut to similar size from drill core using a diamond saw (Figure 5).

Not another HPGR trade-off study! | SpringerLink

Over the past several years, the combination of higher energy and steel costs and the recent commercial deployment of high-pressure grinding rolls (HPGR) technology in hard rock mining have led many multinational mining companies to evaluate the suitability of HPGR technology for their particular comminution circuits. HPGR technology is perceived to require a …

Rock characterisation for high pressure grinding rolls ...

High Pressure Grinding Rolls (HPGR) technology is accepted as an energy-efficient and cost-effective alternative for treating specific mineral ore types. ...

High Pressure Grinding Rolls Versus Sag Mill Pitcairn

high pressure grinding rolls versus sag mills Mill grinding Wikipedia SAG is an acronym for semiautogenous grinding SAG mills are autogenous mills that also use grinding balls like a ball mill. Get Price. Hot products. Sand Washing Machine.

SPECIFIC COMMINUTION ENERGY - SMC Testing

crushers, High Pressure Grinding Rolls (HPGR) and wet tumbling mills such as Autogenous (AG) Semi-autogenous (SAG), rod and ball mills. As well as the total specific energy it will also predict the specific energy of the crushing section, the HPGR section and the tumbling mill section separately.

HPGR - CEEC (Coalition for Eco Efficient Comminution)

The High Pressure Grinding Rolls (HPGR) is a relatively new comminution technology that has been shown to be more energy efficient compared to semi- autogeneous (SAG) mills. Full and fair consideration cannot be given to HPGR-based comminution circuits in early stage projects, because presently pilo...

MEI's Barry Wills: Where are SAG mills going?

He says that is seeing a rise in demand for larger cone crushers that are matched with large high pressure grinding rolls (HPGRs) for customers who want to replace SAG mills in order to increase efficiency. Utilising cone crushers and HPGRs allows ore to be processed from 250mm to 50mm in cone crushers, then down to less than 6mm from HPGRs.

POLYCOM high-pressure grinding roll.

a part of the tube mill's grinding work is shifted to the high-pressure grinding roll. In compound operation with a SAG mill, the POLYCOM' can be used for increasing the grinding plant's throughput. Heap leaching processes also benefit from incorporation of the POLYCOM'. The ground product can either be conveyed directly to the

HPGR High Pressure Grinding Rolls |

Used in mining applications for the last 30 years, high pressure grinding rolls (HPGR) reduce particles by compressing and crushing the feed between two counter rotating, parallel rollers with a small gap between them. This forces the rocks against each other and compresses the feed's density to 80% of its solid volume, exceeding its ...

Size Of High Pressure Grinding Rolls At Vasilkovka Gold

High Pressure Grinding Rolls Versus Sag Mills 11 . Creates microcracks for downstream processes. Provides a more stable grinding operation for variable ores. Reduces the need for and consumption of grinding media. Roller Press Grinding Theory In Cement 2 . Cement grinding operation may be performed in one of the following mill setups. ...