How To Concentrate The Gold In Hard Rock After Grinding

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Grinding media can be steel rods, steel balls, hard pebbles or the ore itself. Autogenous and Semi-Autogenous Mills Autogenous (AG) and Semi-Autogenous (SAG) milling has seen increased use in recent years, especially in large mineral processing operations.

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Comminution, i.e. grinding, is frequently the most energy-intensive step between mine and metal. High pressure grinding rolls (HPGR) are being installed in a rapidly growing number of ‘hard rock’ mineral processing operations. In the energy conscious cement industry, HPGR grinding has been standard practice for decades.

Ore processing

The grinding process reduces the rock to a slurry. The SAG mill is a large revolving cylinder. Rock is ground by the turning action of the mill, and impact from the hardened steel balls and the rock itself. In order to ensure that the rock is ground finely enough the SAG mill has a trommel screen (5), which acts like a large sieve.

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Extracting gold from rock - OpenLearn - Open University

Powdering the rock The next step was to take the crushed pieces of rock and make them even smaller. We used a heavy metal rod (a broken half shaft from a four wheel drive) and smashed the small bits of rock in a saucepan. The rock needed to be powdered for us to get to all the gold within the rock.

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