ANALISA PERUBAHAN SUSEPTIBILITAS MAGNETIK DAN KOMPOSISI PARTIKEL PASIR ALAM SUNGAI ROKAN SEBAGAI FUNGSI KECEPATAN PUTAR TABUNG BALL MILLING

Research has been carried out on magnetic susceptibility and magnetic particle composition of natural sand on the Rokan River, Riau Province as a function of the rotating speed of ball milling tubes. The sample is dried in the sun before separating the magnetic particles from non-magnetic particles using an Iron Sand Separator, this result is called the ISS product. ISS products are milled with different milling tube rotational speeds of 100, 150, and 200 rpm with an iron ball with a diameter of 2.0 cm. The product obtained from ball milling is then separated by magnetic and non-magnetic particles using a Neodymium Iron Boron (NdFeb) magnet, this result is called a ball milling product (BM product). The results of this study indicate that the magnetic susceptibility of the ISS product has a value 1,930.771 × 10 -5 , while the value of the magnetic susceptibility of ball milling products increases with the increase in the rotational speed of the tube, namely 28,188.141 × 10 -5 , 31,136.137 × 10 - , 5 and 33,123.550 × 10 -5 for a rotating speed of 100, 150, and 200 rpm. XRF identification results show that the magnetic element Fe increased from 13.777% to 27.064%, while the non-magnetic element Si decreased from 58.401% to 42.920%.