Screening
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Transcript of Screening
![Page 1: Screening](https://reader033.fdocuments.net/reader033/viewer/2022061607/55862f3cd8b42a2b308b4fa8/html5/thumbnails/1.jpg)
SCREENING
Zuliyana_L2C3o8o41
![Page 2: Screening](https://reader033.fdocuments.net/reader033/viewer/2022061607/55862f3cd8b42a2b308b4fa8/html5/thumbnails/2.jpg)
Pengertian
Sreening adalah proses pemisahan komponen materi heterogen, berdasarkan perbedaan volumenya.
Contoh :
Mengambil batu pasir dari materi heterogen yang terbentuk oleh batu kerikil dan batu pasir.
![Page 3: Screening](https://reader033.fdocuments.net/reader033/viewer/2022061607/55862f3cd8b42a2b308b4fa8/html5/thumbnails/3.jpg)
Proses Screening
1. Dry Screening bahan tidak mengandung air bahan memerlukan pengeringan
sebelum proses screening.
2. Wet Screening
Memerlukan penambahan air kedalam material selama operasi.
![Page 4: Screening](https://reader033.fdocuments.net/reader033/viewer/2022061607/55862f3cd8b42a2b308b4fa8/html5/thumbnails/4.jpg)
Analisa Screen
1. Analisa celah/lubang
jarak antar kawat pada screen
2. Analisa aperture (screen size)
ukuran linear bebas minimun lubang screen
3. Analisa jaringan/mesh
jumlah celah per linier inch
![Page 5: Screening](https://reader033.fdocuments.net/reader033/viewer/2022061607/55862f3cd8b42a2b308b4fa8/html5/thumbnails/5.jpg)
Effectiveness Screen
1. Recovery Product
2. Rejection Product
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Effectiveness = Recovery x Rejection
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Alat – Alat Screening
1. GRIZZLY
Prinsip Kerja :Berdasarkan adanya gaya gravitasi.
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2. TROMMEL
a) Tandem Trommel
b) Compound Trommel
c) Seri Trommel
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a) Tandem Trommel
Prinsip Kerja :Berdasarkan gaya gravitasi dan gaya sentrifugal
![Page 10: Screening](https://reader033.fdocuments.net/reader033/viewer/2022061607/55862f3cd8b42a2b308b4fa8/html5/thumbnails/10.jpg)
c) Seri Trommel
Terdiri dari beberapa trommel yang
digunakan secara bersamaan
Prinsip Kerja :
Berdasarkan gaya sentrifugal dan gaya
gravitasi
![Page 11: Screening](https://reader033.fdocuments.net/reader033/viewer/2022061607/55862f3cd8b42a2b308b4fa8/html5/thumbnails/11.jpg)
b) Compound Trommel
Prinsip Kerja :Pemisahan fase padat-padat(kering) berdasarkan gaya sentrifugal dan gaya gravitasi
![Page 12: Screening](https://reader033.fdocuments.net/reader033/viewer/2022061607/55862f3cd8b42a2b308b4fa8/html5/thumbnails/12.jpg)
3. Vibrating Screens
a) Electrical Vibrating Screen
b) Hummer Screen
c) Rotex Screen
![Page 13: Screening](https://reader033.fdocuments.net/reader033/viewer/2022061607/55862f3cd8b42a2b308b4fa8/html5/thumbnails/13.jpg)
a) Electrical Vibrating Screen
Prinsip Kerja :Gaya getaran yang dihasilkan oleh tenaga listrik
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b) Hummer Screen
Prinsip Kerja :Menggunakan magnet AC pada bingkai ayakan.
![Page 15: Screening](https://reader033.fdocuments.net/reader033/viewer/2022061607/55862f3cd8b42a2b308b4fa8/html5/thumbnails/15.jpg)
c) Rotex Screen
Prinsip Kerja :Gaya gravitasi dengen lebih dari satu ayakan
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4. Shaking Screen
Prinsip Kerja :Alat diguncang oleh batang eksentrik yang berputar
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Contoh Soal 26-1
Analisa ayak yang terlihat pada tabel 26-2 berlaku untuk suatu contoh kuarsa hancuran. Densitas partikel 2.650 kg/m3 (0,00265 g/mm3) dan faktor terbentuknya(a)=2 dan Фs=0,571. untuk bahan tersebut yang ukuran partikelnya antara 4-200 mesh, hitunglah:
a.Aw dan Nw
b.Dv
c.Ds
d.Dw
e.Ni untuk totokan 150/200 mesh
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Tabel 26-2 Analisis Ayak
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Penyelesaian
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