Presentasi Prakerin @Antam
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Transcript of Presentasi Prakerin @Antam
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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