Journal of Mining Engineering

Journal of Mining Engineering

Controlling the percent solids of concentration plant No.1 hydrocyclones overflow by a soft sensor at the Sarcheshmeh Copper Complex

Document Type : research - paper

Authors
Hamzeh Amiri 1
Mostafa Maleki Moghaddam 2
Saeed Zare 3
Hamid reza Rahimipoor 4
Samad Banisi 5
1 Student of Mineral Processing, Mining Engineering Department, Vali-e-Asr University of Rafsanjan
2 Mineral Processing Group, Vali-e-Asr University of Rafsanjan, Rafsanjan, Iran
3 Kashigar Mineral Processing Research Center, Shahid Bahonar University of Kerman, Kerman, Iran
4 Sarcheshmeh copper compelex, Rafsanjan, Iran
5 Mining Engineering Department, Shahid Bahonar University of Kerman, Kerman, Iran
10.22034/ijme.2020.103131.1697
Abstract
The primary grinding of the concentration plant No.1 at the Sarcheshmeh copper complex includes eight ball mills working in a closed circuit with hydrocyclones. Due to the importance of the density of hydrocyclones in the classification process, the overflow density control loop was included in the initial plant design. Because of high cost, additional maintenance efforts, safety issues and constraints of nuclear density meters, this control loop never became operational. In this research, the percent solids was determined based on the mass balance equations in a format of a soft sensor. These sensors are computer programs that are used as an inexpensive alternative to hardware sensors and their use has increased in the material processing industry in the recent years. After transferring of the measured data to the control room, a program based on mass balances of solid and water the calculations for all 8 ball mills was prepared. To start the overflow density control loop, a control valve was installed on the inlet of the hydrocyclones feed tank. With the installation of hardware and the use of a soft sensor, the hydrocyclones overflow density control loop made operational for one of the ball mills. The monitoring of the circuit showed that the percent solids fluctuation of hydrocyclones overflow decreased from the range of 30.4 ± 4.5 when the percentage of solids was not displayed to a range of 28 ± 0.5 when using the percent solids control loop was operational. Furthermore, the measurement of the size distribution indicated that the percent of material finer than 75 microns of the overflow increased from 63.5% to 67% on account of installation of the control loop.
Keywords
Ball Mill
Hydrocyclone
Control Loop
Percent Solids
Sarcheshmeh
Subjects

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  • Receive Date 02 March 2019
  • Revise Date 08 January 2020
  • Accept Date 10 January 2020