minprob5- metalurgi akunting 2015

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Metalurgi akunting

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ANALISA KONSTITUEN

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Konsentrat, Middling dan Tailing

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Analisa Kualitatif - kuantitatif

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Analisa Kualitatif - kuantitatif

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MASSA, BERAT DAN KADAR AIR

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Massa dan berat

• The weight of an object is the effect of gravityacting on the mass of the object and is equalto the mass x gravitational acceleration = M g.

• Therefore the weight of an object willchangedepending on the value of g which will

change depending on the geological locationof the object. In outer space for example,objects are weightless.

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Kadar air

• Grab samples for moisture determination are frequently taken

from the end of a conveyor belt after material has passed

over the weighing device.

• The samples are immediately weighed wet, dried at a suitable

temperature until all hygroscopic water is driven off, and then

weighed again. The difference in weight represents moisture

and is expressed as:

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Kadar air

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SLURRY

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slurry

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slurry

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Latihan soal

1

2.

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KADAR DAN PEROLEHAN(GRADE AND RECOVERY)

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Grade and Recovery

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NERACA MATERIAL

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Contoh

• Thus if we take 100 kg of a feed stream

containing 2.5% nickel and if 20% by mass of

the feed stream forms the concentrate, then

the mass of concentrate is 20 kg.

•  If the grade of nickel in the concentrate

equals 10%, then 20 kg of concentrate will

contain 0.1 x 20 = 2 kg nickel.

• Hence Ni recovered is 2/2.5 x 100 = 80% by

mass.

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Distribusi

• The concept of distribution can be seen from the following illustration. In the

above example only 80% of the mineral present has been accounted for in the

concentrate, the rest of the mineral must be in the tailings, neglecting the

existence of a middling product.

• Since the mass of the concentrate is 20 kg, then the mass of the tailings must be

80 kg. Let us assume that chemical analysis indicated that the nickel in the tailingswas 0.6%. The nickel distribution between the concentrate and tailing product

streams is then calculated as illustrated in Table 17.1.

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Neraca Material

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Neraca Material – 2 produk

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Neraca Material – 2 produk

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Contoh