STUDY OF IDENTIFICATION AND OPTIMIZATION OF FROTH PROFILE BEHAVIOUR ON PT AMMAN MINERAL NUSA TENGGARA ROUGHER FLOTATION CELL WITH VISIOFROTH

• Main Author: Pratama, Hadisurya
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/51498
• Institution: Institut Teknologi Bandung

PT Amman Mineral Nusa Tenggara (PT AMNT) is a copper mining and processing company in Indonesia. PT AMNT processes 100,000 tons of ore per day with a feed grade of 0.3-0.6% Cu, as well as producing 2,000 to 3,000 tons of concentrate per day with 19-25% Cu content. At present, the operation of flotation in the rougher scavenger circuit is done by adjusting several operating variables, one of which is regulating the depth of the foam. The depth of the froth is determined based on the operator's observations of the resulting concentrate, so the determination can be different between operators. PT AMNT has an active (Visiofroth) instrument for viewing the froth of flotation products installed on row 3 of the Rougher Scavenger circuit. In this study, an experiment was carried out to identify the behaviour of the flotation froth by using Visiofroth as well as optimizing the velocity profile of the flotation process froth in the rougher circuit owned by PT AMNT. A series of experiments carried out in this study include sampling, froth image recording, solid percent calculation, sift analysis, and mass balance making. Sampling is done by taking samples from each material flow including (feed, concentrate, and tail) of each cell. Samples were taken with a variety of froth velocity that is in accordance with the plant, accelerated and slowed. At the same time, foam image recording is carried out in the control room to see the foam structure produced. After the sample is taken, a metallurgical test is carried out in the form of a percent solid calculation, a sifter analysis of 38-300?m, and a Cu level test using Atomic Absorption Spectrometry (AAS). After all data is obtained, a calculation and mass balance is made. Analysis of the data obtained from the experiment shows that the relationship between the velocity of the froth has a directly proportional relationship to the acquisition and inversely proportional to the grade of the concentrate, the depth of the froth and the percentage of solids produced. The velocity of the foam also affects the structure of the froth that is produced, the greater the size of the froth. Moreover, the froth velocity also tends to be inversely proportional to the grind size recovery at size 38-212?m, and at sizes above 212 ?m the acquisition value is not too significant. Optimal foam velocity profile in the experiments carried out namely: (set point in cells 1 and 2 at 43 cm foam depth) Cell 1: 3.11-5.01 cm / s, cell 2: 0.86-1.2 cm / s, whereas (set point on cells 3 and cell 4 at foam depth 38 cm), cell 3: 0.63-0.79 cm / s and cell 4: 2.00-2.20 cm / s