آخرین محصولات
Fig. 1. (a and b) The Starkey laboratory mill at El Teniente...
This index is obtained by a batch grinding test, where two kilograms of ore are ground in a standardised mill setup (10 cm diameter by 30 cm long). The index is obtained by a mathematical...
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DEVELOPMENT PLANNING FOR SAG MILL DESIGN …
kWh/t to grind the ore from F80 152 mm to T80 1.7 mm). The SAGDesign laboratory network, comprises 15 independent laboratories, and is managed by Starkey, to direct and provide SAG mill grinding tests and mill design services to clients world-wide. Starkey also offers a wide range of consulting services including plant start-up assistance
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Welcome to Starkey & Associates Inc.
Starkey & Associates Inc. is the name behind a number of the most successful grinding circuit designs in the mining industry today. We are proud to offer grinding circuit …
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Recent International Concentrator Start-ups Do and Don'ts
2 Starkey & Associates Inc. 212-151 Randall Street . Oakville, ON L6J 1P5 Canada . PH: (905) 849-6111 . E-mail: paul.scinto@sagdesign . 3 Starkey & Associates Inc. ... The importance of accurate grinding mill design for SAG grinding circuits cannot be …
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Comparison of Ore Hardness Measurements for Grinding Mill …
Grinding Mill Design for the Tenke Project John Starkey1, Principal Consulting Engineer David Meadows2, Manager Mineral Processing Development 1 Starkey & Associates 344-115 George St. Oakville, ON L6J 0A2 PH: (416) 735-7512 E-mail: john.starkey@sagdesign 2 Phelps Dodge Corporation One North Central Ave. …
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(PDF) Power-based comminution calculations using Ausgrind
Observations are that the specific energy requirements for the mill grinding duty is wide and varied. ... (Morrell, 2004) 31.5 5 Single particle / No AG / SAG mills SAG Design Test (Starkey et al ...
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Authors: John Starkey, Starkey & Associates Inc. and Mike …
SAGDesign testing was introduced commercially in 2004 using technology invented by J. Starkey and patented by Outotec. The SAGDesign test involves crushing an ore sample to 80% passing 19mm, and grinding it in stages in the 0.5m diameter SAG mill to measure the revolutions of the mill required to achieve a product size of 80% passing …
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Authors: John Starkey, Starkey & Associates Inc. and Mike …
grinding it in stages in the 0.5m diameter SAG mill to measure the revolutions of the mill required to achieve a product size of 80% passing 1.7mm. The SAG ground ore is then tested using a standard Bond Ball Mill Work Index test, with a closing screen to match the liberation grind as closely as possible. Both
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Keys to best practice comminution
The new Starkey Mini Pilot SAG Mill has the same grinding chamber dimensions as the laboratory SAGDesign test mill which has treated the same size …
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The performance improvement of a full-scale autogenous mill by setting
The detail of Starkey mill has been described elsewhere (Amelunxen et al., 2014), but in general it is a 30.5 cm (1 ft) diameter by 10.2 cm (4 inches) length cylindrical grinding mill. The mill is run with several screening iterations until the sample is reduced to 80% less than 1.7 mm.
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The Starkey Test Revisited Rev19
The test is a dry batch grinding test in which the mill is rotated and the sample ground until it reaches 80% passing Tyler #10 mesh, or 1.7mm (Starkey et al.1994). Because the time required to achieve 80% passing 1.7 mm is not known before starting the test, an initial grinding time is selected, the sample is ground and removed from the mill ...
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NEW PRODUCT ANNOUNCEMENT, by Starkey
NEW PRODUCT ANNOUNCEMENT, by Starkey & Associates Inc. Oakville, ON. August 10, 2020 Lab-Scale Continuous Semi-Autogenous (SAG) Grinding Mill A Lab-Scale Starkey SAGDesign Pilot Plant Continuous Wet SAG Mill (Mini Pilot SAG Mill) has been developed by Starkey & Associates Inc. to fulfill a need in the mining industry to …
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PRE-CRUSHING OF SAG FEED: FRIEND OR FOE
grinding that needs to be done both reduce grinding energy so this paper is important to co-ordinate these ideas. Starkey has used pre-crushing in commercial projects for over 20 years so these ideas are sound and not new. Keywords SAG Mill, pre-crushing, ore sorting, energy reduction, SAGDesign testing
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Keys to best practice comminution
SAG mill grinding has proven over the years to be an attractive and preferred technology and highly effective for grinding ore in a concentrator. ... The new Starkey Mini Pilot SAG Mill has the same grinding chamber dimensions as the laboratory SAGDesign test mill which has treated the same size standard drill core and which has been used ...
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Feed hardness and acoustic emissions of autogenous/semi …
After that, wet grinding (rock-ball-water mixture) tests were performed for the individual rock types at different grinding times (5, 10, 15, 20 and 30 min) and a constant mill revolution of 54 rpm, representing ∼ 70 % of the critical speed (Amelunxen et al., 2014). Binary mix ratios (1:3, 1:1, and 3:1) of quartz and iron ore were subjected ...
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CALCULATION OF THE REQUIRED SEMIAUTOGENOUS …
quired grinding power, which conditions the choice of size and drive of a mill. This article describes the Barratt–Doll method advanta-geous for being based on the Bond work indexes that are de-terminable in any well-fitted ore pretreatment laboratory (it is UDC 622.732 O. I. SKARIN (RIVS Science and Production Association)
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sbm/sbm john starkey impact on grinding mill design
Contribute to dihog/sbm development by creating an account on GitHub.
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Process development testing for comminution circuit design
This paper reviews current practices for determining the ore characteristics relevant to comminution circuit design. Particular attention is given to the design of sampling and testing programs, and the methods commonly applied to size crushers and mills for conventional size reduction applications in mineral processing.
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LAB-SCALE CONTINUOUS SEMI-AUTOGENOUS (SAG) GRINDING MILL
The SAG mill includes a grinding chamber barrel within an upstream portion of the rotatable cylinder, the grinding chamber barrel having an inside diameter of about 19.2 inches and a length of about 6.4 inches and incorporating at least one interior lifter. ... Inventors: Starkey, John (Oakville, CA) Application Number: 18/008805 . Publication ...
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Ball mill
Starkey & Associates Grinding Design and Process Engineering (Ontario, CA) Primary Class: 241/30. Other Classes: 241/172, 241/179, 241/183, 241/184 ... The ball mill of the present invention will be referred to herein as a semi-autogenous grinding (SAG) mill, to distinguish over ball mills known in the art.
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SAGDesign Test | Starkey and Associates Inc.
The SAG mill pinion energy, W SDT (kWh/t) and SAG discharge Bond ball mill work index, S d-BWI (kWh/t), are then used to calculate the total energy to grind the ore from 80% passing 152 mm to 80% passing the client specified final product size P 80.This information, along with the ore specific gravity, is used to calculate necessary mill sizes and motor …
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Starkey & Associates Inc-Consulting Engineers | LinkedIn
Starkey & Associates Inc. is the name behind a number of the most successful grinding circuit designs in the mining industry today. Our projects span the globe from Australia, Finland and Russia in the East, to Peru, Canada and the United States in the West. 16 well known testing laboratories in these countries work with us to provide SAGDesign testing …
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Ball mill
1. A pilot plant SAG mill comprising a cylindrical outer chamber having flanges at opposed ends, said cylindrical outer chamber having a diameter of 2.5-5.5 feet and a ratio of length to diameter in the range of greater than 1:1, said cylindrical outer chamber containing a removable grinding chamber in the form of a sleeve, longitudinal lifters and a …
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Achieving SAG Mill Design Production at Start-Up Using …
email: john.starkey@sagdesign Abstract The goal of this address is to review best practices in grinding circuit design, the expectations of clients who build a new plant, the results achieved during recent start-ups, and from this to conclude whether starting up at design tonnage in a SAG mill can be a fact
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Pugmill Mixers
Size: 14″ – 78″ (356 – 1,981mm) Capacity: 500 lb/hr – 250 TPH. Double shaft design for thorough mixing of materials. Heavy-duty construction for years of reliable operation. Binder spray system to accommodate a liquid feed. Options in paddle facings to help prevent wear. Bottom doors open for cleanout. Reversible paddles for modifying ...
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LAB-SCALE CONTINUOUS SEMI-AUTOGENOUS …
The SAG mill includes a grinding chamber barrel within an upstream portion of the rotatable cylinder, the grinding chamber barrel having an inside diameter of about …
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A CRITICAL REVIEW OF GRINDING DESIGN …
J. H. Starkey (Starkey & Associates Grinding Design and Process Engineering) E-mail for correspondence: john.starkey@sagdesign Introduction …
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Testwork: SAG grindability index
The SAG Grindability Index (SGI) test, or alternatively the trademarked SAG Power Index (SPI), is a SAG-specific test involving a small batch SAG mill that is charged with a two kilogram ore sample and ground until the product has achieved an 80% passing size of 1.7 mm. The test result is reported as time required to achieve the target product ...
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Impact on Grinding Mill Design of Recent New Discoveries …
Grinding mills were designed for each project, so every project in a sense, was a trial of how well the testing/calculation method suited the ore. The results showed that in all cases there were no problems in sizing the grinding mills, even for the hardest ores. There are three key elements in a successful SAG mill grinding circuit design.
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Energy Efficiency Comparison in Fine Grinding in the Mining …
Starkey & Associates SAGDesign Ball Mill : 25 mm versus Small Grinding Media 3 Months Performance Secondary Ball Mill Media Unit 25mm Millpebs Running Hours h 1 737.8 1 737.8 Underflow K80 µm 102 102 Discharge D80 µm 72 73 Power kW Tonnage TPH 113 113 Energy kWh/t Total Added Media kg Average t/month 3 Months Performance …
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