Testwork: SAG grindability index - Revision history

Alex Doll: /* Laboratory Outputs */

2015-07-24T19:35:36Z

Laboratory Outputs

Alex Doll: /* Differences: Starkey SAG Test and Starkey SAGDesign Test */

2015-07-24T19:35:19Z

Differences: Starkey SAG Test and Starkey SAGDesign Test

Alex Doll at 18:40, 11 April 2015

2015-04-11T18:40:12Z

Alex Doll: /* Trademarks & Licensing */

2015-04-11T17:56:16Z

Trademarks & Licensing

Alex Doll: /* Models */

2015-04-11T17:55:08Z

Models

Alex Doll: Created page with "category:Testwork category:SGI ==Testwork: SAG Grindability Index (SGI)== {{Test|name=SAG Grindability Index|Abrev=SGI|Alt=SPI™, SAG Power Index™, Starkey ..."

2013-12-05T22:41:06Z

Created page with "category:Testwork category:SGI ==Testwork: SAG Grindability Index (SGI)== {{Test|name=SAG Grindability Index|Abrev=SGI|Alt=SPI™, SAG Power Index™, Starkey ..."

New page

[[category:Testwork]]
[[category:SGI]]
==Testwork: SAG Grindability Index (SGI)==
{{Test|name=SAG Grindability Index|Abrev=SGI|Alt=SPI™, SAG Power Index™, Starkey SAG test|F80=12 700 µm|P80=1700 µm|Models=SGI, CEET 1 & 2}}
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 size (in minutes).

For tests performed at SGS laboratories, companion determination of the SPI is the '''CI''' (Crusher Index), which should not be confused with a ''Crushing Work Index''. The ''CI'' is used as a parameter in determining the feed size of a sample in the CEET2 model, and can be thought of as an "amenability to crushing" index. Higher values indicate finer material (which usually means "softer").

===Sample Requirements===
An SGI determination (no CI) requires 2 kg of material with F80 of at least 12 mm.

A combined SPI and CI determination requires about 8 kg of material at least 20 mm top size (normally, split NQ-diameter or split HQ-diameter drill core is used).

===Differences: Starkey SAG Test and Starkey SAGDesign Test===
The SPI test was originally named the "Starkey SAG Test" in a paper presented at the Canadian Mineral Processors meeting in January, 1994. The inventor of the test, John Starkey, was associated with Minnovex Technologies Inc. and assigned the test's patent to them. Minnovex was subsequently sold to SGS Mineral Services, a major operator of metallurgical laboratories, and the capability to perform SPI tests was transferred to SGS laboratories world-wide.

John Starkey left Minnovex to form Starkey and Associates, Inc. and developed a different test with superficial similarities with SPI; this new test was named the "SAGDesign Test".

The SGI or SPI test is still occasionally referred to as the "Starkey SAG Test", but this causes confusion with the "Starkey and Associates" SAGDesign test. The term "SPI" is a trade mark of SGS and can not be used by laboratories who haven't licensed it from SGS, whereas the term "SGI" was proposed by Peter Amelunxen in a paper published in Minerals Engineering as a generic name for the SPI test to avoid infringing the SGS trade mark.

To avoid confusion between types of "Starkey test" (SGI, the generic form of SPI and SAGDesign), check the units that the test result are reported in. If the results are reported in "minutes", then the test is SGI or the generic version of SPI. If the results are reported in "revolutions" or "kWh/t", then the test is SAGDesign.

===Models===

The SPI test is used in the CEET model (''Comminution Economic Evaluation Tool'') developed by Minnovex and now marketed by SGS. There are two forms of CEET - the older "CEET 1" model is a power-based model that predicts grinding specific energy consumption for a SAG mill (Esag) using a formula with superficial similarity to a Bond equation.

The newer "CEET 2" model is a hybrid of a population-balance model and a power-based model that uses SPI to estimate Esag (SPI also is a parameter in feed size, pebble crusher circulating load and T80). The CI value is used as a parameter to estimate the SAG feed particle size distribution.

===Trademarks & Licensing===
SPI is a trade mark of SGS Mineral Services who is the exclusive provider of the test in Canada, the USA and other countries where it is patented.

Minnovex (Technologies) is a trade mark of SGS Mineral Services. Note that the name "Minnovex" in the SAGMILLING.COM database of historic testwork samples refers to the former Minnovex laboratory located in Toronto prior to the take-over by SGS.

SAGDesign is a trade mark of Starkey and Associates, Oakville, Canada.

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-==Laboratory Outputs==
+===Laboratory Outputs===
 The laboratory will report the following information:
 * <b>ci:</b> The Minnovex crushing index, a measure of the amenability to crushinge)

← Older revision		Revision as of 17:55, 11 April 2015
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	===Models===		===Models===

		+	The [[Model:Amelunxen SGI\|Amelunxen SGI model]] built into sagmilling.com is based on the method by Amelunxen et al (2013). It is a power-based model that predicts E<sub>sag</sub> using the SAG grindability index (should be compatible with SPI™), and predicts E<sub>ball</sub> using the Bond ball mill work index with a manual calibration factor CF<sub>ball</sub> to account for effects like the [[phantom cyclone]].
⚫	The ~~SPI~~ test is used in the CEET model (''Comminution Economic Evaluation Tool'') developed by Minnovex and now marketed by SGS. There are two forms of CEET - the older "CEET 1" model is a power-based model that predicts grinding specific energy consumption for a SAG mill (E<sub>sag</sub>) using a formula with superficial similarity to a Bond equation.

		⚫	The SPI™ test is used in the CEET model (''Comminution Economic Evaluation Tool'') developed by Minnovex and now marketed by SGS. There are two forms of CEET - the older "CEET 1" model is a power-based model that predicts grinding specific energy consumption for a SAG mill (E<sub>sag</sub>) using a formula with superficial similarity to a Bond equation.
⚫	The newer "CEET 2" model is a hybrid of a population-balance model and a power-based model that uses SPI to estimate E<sub>sag</sub> (SPI also is a parameter in feed size, pebble crusher circulating load and T<sub>80</sub>). The CI value is used as a parameter to estimate the SAG feed particle size distribution.

		⚫	The newer "CEET 2" model is a hybrid of a population-balance model and a power-based model that uses SPI to estimate E<sub>sag</sub> (SPI also is a parameter in feed size, pebble crusher circulating load and T<sub>80</sub>). The CI value is used as a parameter to estimate the SAG feed particle size distribution.

	===Trademarks & Licensing===		===Trademarks & Licensing===

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 ===Differences: Starkey SAG Test and Starkey SAGDesign Test===
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 To avoid confusion between types of "Starkey test" (SGI, the generic form of SPI and SAGDesign), check the units that the test result are reported in.  If the results are reported in "minutes", then the test is SGI or the generic version of SPI.  If the results are reported in "revolutions" or "kWh/t", then the test is SAGDesign.
 ===Models===

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 [[category:Testwork]]
-[[category:SGI]]
+[[category:SGI model]]
 ==Testwork: SAG Grindability Index (SGI)==
 {{Test|name=SAG Grindability Index|Abrev=SGI|Alt=SPI&trade;, SAG Power Index&trade;, Starkey SAG test|F80=12&nbsp;700 &micro;m|P80=1700 &micro;m|Models=SGI, CEET 1 &amp; 2}}

@@ Line 36: / Line 36: @@
 SPI is a trade mark of SGS Mineral Services who is the exclusive provider of the test in Canada, the USA and other countries where it is patented.
-Minnovex (Technologies) is a trade mark of SGS Mineral Services.  Note that the name "Minnovex" in the SAGMILLING.COM database of historic testwork samples refers to the former Minnovex laboratory located in Toronto prior to the take-over by SGS.
+Minnovex (Technologies) is a trade mark of SGS Mineral Services.  Note that the laboratory name "Minnovex" in the SAGMILLING.COM database of historic testwork samples refers to the original Minnovex laboratory located in Toronto prior to the take-over by SGS.
 SAGDesign is a trade mark of Starkey and Associates, Oakville, Canada.