PRAKTIK KERJA INDUSTRI DI PT. ANTAM TBK UBPE PONGKOR

2012/2013

Oleh: Arrovi Septian 09.55.06389

KEMENTERIAN PERINDUSTRIAN RI

Pusat Pelatihan dan Pendidikan Industri

SMK-SMAK Bogor

Sejarah

Proses

Produksi

Kegiatan

Laboratorium

Fire Assay

Kadar CN- dan NH3

Spektrofotometri Serapan Atom

pH dan Suspensi Solid

“Variasi Komposisi Meni Timbel (Pb3O4) dalam Bahan

Imbuh Terhadap Hasil Analisis Dengan

Menggunakan Metode Fire Assay”

Tugas Khusus - SMAK Bogor

Dasar

“Perbandingan komposisi meni timbel (Pb3O4) yang baru,

dibandingkan dengan perbandingan komposisi standar.

Perbandingan komposisi baru akan diterima bila t hitung < t tabel.”

Tujuan

“Sebagai langkah efisiensi pemakaian pereaksi yang

berhubungan langsung dengan misi PT. Antam Tbk UBPE Pongkor pada

poin ke 2.”

Tahapan

Kerja

4

3

2

3,75

3,50

3,25

3 3 3

22 2

Standar 25 gramSampel 50 gram

+ Fluks 150 gram

Bullion ditimbang dan

dipisahkan.

Sampel dilebur dengan suhu + 1000 0C selama 40 menit.

Sampel dikupelasi dengan suhu + 500 0C

hingga terbentuk bullion.

HNO3 1:1

Bullion diparting di atas hot plate dengan

penambahan HNO3 1:1 sebanyak 1 kali dan

dibilas dengan air suling sebanyak 3 kali.

Bagan Kerja Penetapan Kadar Emas Secara Fire Assay

Dikeringkan di atas hot

plate.

Ditimbang emas murni hasil proses

parting.

Dihitung kadar emasnya dari sampel

yaitu Standar dan Sampel.

No.

Perlakuan

SelisihBobot Button (gram)

Bobot Bullion (gram)

3,25(gpt)

Standar(gpt)

Bobot Sampel (gram)

1. 39,3960 0,665 8,92 10,01 50 1,09

2. 40,6659 0,659 8,76 10,01 50 1,25

3 38,9058 0,682 8,84 10,01 50 1,17

%Recovery 88,31

Rata-rata 1,17

N 3

SD 0,08

RSD 6,84

t-hitung 7,16

t-tabel (α=5%) 4,30

Data 1. Standar - Fluks 3,25t hitung > t tabel

Data 2. Standar - Fluks 3,50t hitung > t tabel

No.

Perlakuan

SelisihBobot Button (gram)

Bobot Bullion (gram)

3,50(gpt)

Standar(gpt)

Bobot Sampel (gram)

1. 30,7210 0,663 9,00 10,01 50 1,01

2. 32,7803 0,659 9,24 10,01 50 0,77

3 38,6809 0,647 9,16 10,01 50 0,85

%Recovery 91,21

Rata-rata 0,87

N 3

SD 0,12

RSD 13,91

t-hitung 4,35

t-tabel (α=5%) 4,30

No.

Perlakuan

SelisihBobot Button (gram)

Bobot Bullion (gram)

3,75(gpt)

Standar(gpt)

Bobot Sampel (gram)

1. 40,8193 0,542 9,72 10,01 50 0,29

2. 43,8909 0,608 9,48 10,01 50 0,53

3 10,3743 0,492 9,84 10,01 50 0,17

%Recovery 96,70

Rata-rata 0,33

N 3

SD 0,18

RSD 55,55

t-hitung 1,35

t-tabel (α=5%) 4,30

Data 3. Standar - Fluks 3,75t hitung < t tabel

No.

Perlakuan

SelisihBobot Button (gram)

Bobot Bullion (gram)

4,00(gpt)

Standar(gpt)

Bobot Sampel (gram)

1. 43,6815 0,665 9,68 10,01 50 0,33

2. 47,2399 0,519 9,52 10,01 50 0,49

3 36,2424 0,504 9,44 10,01 50 0,57

%Recovery 95,40

Rata-rata 0,46

N 3

SD 0,12

RSD 26,57

t-hitung 2,30

t-tabel (α=5%) 4,30

Data 4. Standar - Fluks 4,00t hitung < t tabel

Grafik Perbandingan Perbandingan Komposisi Meni Timbel dalam Bahan Imbuh

1 2 38.2

8.4

8.6

8.8

9

9.2

9.4

9.6

9.8

10

Komposisi 3,25

Komposisi 3,50

Komposisi 3,75

Komposisi 4,00

gpt

Sampel (ulangan)

No.

Perlakuan

SelisihBobot Button (gram)

Bobot Bullion (gram)

3,75(gpt)

4,00(gpt)

Bobot Sampel (gram)

1. 10,2814 3,695 8,80 8,22 50 0,58

2. 10,7312 3,717 8,80 8,22 50 0,58

3 12,6308 3,738 8,80 8,22 50 0,58

4. 17,5326 3,744 8,80 8,24 50 0,56

5. 18,5387 3,855 8,80 8,24 50 0,56

6. 16,8636 3,827 8,80 8,24 50 0,56

7. 14,8918 3,716 8,80 8,24 50 0,56

8. 16,3373 3,773 8,80 8,24 50 0,56

9. 17,8322 3,767 8,84 8,26 50 0,58

10. 12,3596 3,762 8,88 8,28 50 0,60

Rata-rata 0,57

N 10

SD 0,014

RSD 2,45

Data 5. Sampel Conveyor MHSFluks 3,75-Fluks 4,00

1 2 3 4 5 6 7 8 9 107.8

8

8.2

8.4

8.6

8.8

9

Fluks 3,75Fluks 4,00

gpt

Sampel (ulangan)

Grafik Perbandingan Sampel Conveyor MHSFluks 3,75-Fluks 4,00

Simpulan

“Variasi fluks dengan perbandingan baru yakni 3,75 memberikan kadar

(gpt) yang lebih tinggi dalam analisis kadar emas dengan

metode fire assay.”

Saran

“ Dilakukan penggantian cawan lempung baru setiap memulai

peleburan, serta suhu yang stabil ditungku peleburan.”

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