An analysis of medium losses in coal washing plants

Sripriya, R.; Dutta, Atanu; Dhall, Purnima; Narasimha, M.; Kumar, Vikas; Tiwari, Bhagyashree

doi:10.1016/j.minpro.2006.04.001

Cited by 12 publications

(8 citation statements)

References 6 publications

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“…The references indicate that the recent studies about the dense medium separation almost center on the flow characteristics in the separators (Narasimha et al, 2007;Wang et al, 2009;Chu et al, 2009;Sripriya et al, 2006;Mukherjee et al, 2003;Mohloana, 2008;Magwai and Bosman, 2007;Peng and Xia, 2007) and the fuzzy control tracking the desired density home and abroad (Celik, 2009;Firth, 2009;Barbee et al, 2008;Spencer and Liu, 2005;Accession number: 20070610411506, 2007;Luttrell et al, 2010;Liu and Wang, 2007;Liu, 2008;Zhao, 2007;Yang and Wang, 2005;Yu and Shi, 2006;Li et al, 2009). There are few studies on solving the problems mentioned above.…”

Section: Introductionmentioning

confidence: 99%

Research on the intelligent control of the dense medium separation process in coal preparation plant

Wang

Kuang

Deng

et al. 2015

International Journal of Mineral Processing

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Section: Introductionmentioning

confidence: 99%

Research on the intelligent control of the dense medium separation process in coal preparation plant

Wang

Kuang

Deng

et al. 2015

International Journal of Mineral Processing

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“…1. Studies have shown that in the DMC circuit, medium entering the DMC can only be recycled by a certain percentage because of losses in the circulation [37], therefore, the mass flow rate of concentrated magnetite from the output of the magnetic separator can be obtained by considering magnetite losses and mass flow balance of the magnetic separator. In the modeling process, the following assumptions are made:…”

Section: A Model Of the Dmcmentioning

confidence: 99%

A Dual-Loop Control System for Dense Medium Coal Washing Processes With Sampled and Delayed Measurements

Zhang

Xia

Zhu

2017

IEEE Trans. Contr. Syst. Technol.

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Abstract-A dual closed-loop control system is developed for a dense medium coal washing process. The controller is designed to improve the separation efficiency and energy efficiency of the dense medium cyclone coal beneficiation process simultaneously making use of a model predictive control (MPC) method and a pumped-storage system. In the dual loop control, the outer loop is designed for medium density profile optimization and the inner loop is used for actuator control of the medium supplying circuit, taking into consideration of the interplay of the energy efficiency and separation efficiency. Mathematical models of the pumpedstorage system and the magnetite recycle process of the dense medium circuit are developed and employed in the design of the advanced controller. The effectiveness of the designed control system is demonstrated by simulations based on operational data from a South African coal beneficiation plant.

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“…The diluted medium collected under the screens is then sent to magnetic separator for subsequence magnetite recovery. Studies have shown that in the DMC circuit, medium entering the DMC can only be recycled by a certain percentage because of losses in the screens and magnetic separator [3], therefore, the mass flow rate of condensed magnetite from the output of the magnetic separator can be obtained by considering magnetite losses and mass flow balance of the magnetic separator. In this modelling process, the following assumptions are made: In other words, (3 percent of the magnetite entering the DMC will report to the magnetic separator for magnetite recovery; 2) The separation efficiency of the magnetic separator is a constant "l B , meaning that "l B percent of the magnetite entering the separator will be separated out from the diluted medium slurry;…”

Section: Modelling Of the Medium Circulation Processmentioning

confidence: 99%

“…However, application of such cleaning technology to coal finer than 0.5rnm is challenging due to the fact that control of the density of medium used under that circumstance becomes a challenge [3]. This also demonstrates the importance of density control.…”

Section: Introductionmentioning

confidence: 99%

Magnetite and water addition control for a dense medium coal washing circuit

Zhang

Xia

Zhu

2015

2015 Chinese Automation Congress (CAC)

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Ahstract-A coal washing circuit is studied for the purpose of better control of the density of medium used in dense medium cyclones to enhance separation efficiency. The process dynamics is mathematically modelled and a controller is designed following model predictive control method. The objective of the control is to adjust the medium density to follow an optimal density profile set by an upper level controVoptimisation system. The main focus of this study is therefore on the modelling of the coal washing process and design of a lower level controller that manipulates the actuators directly. A pump-storage system introduced in our previous study is considered in the model to save energy consumption of the process. For the actuators, a screw conveyor is introduced to add magnetite to the corrected medium sump for density correction of the recovered medium. After the model and control system are presented, simulations are carried out to verify the effectiveness of the proposed system. In particular, the controller is applied to the system to track two different density profiles. Results of these simulations show that the controller designed is able to track a given density profile with minimal tracking errors.

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An analysis of medium losses in coal washing plants

Cited by 12 publications

References 6 publications

Research on the intelligent control of the dense medium separation process in coal preparation plant

Research on the intelligent control of the dense medium separation process in coal preparation plant

A Dual-Loop Control System for Dense Medium Coal Washing Processes With Sampled and Delayed Measurements

Magnetite and water addition control for a dense medium coal washing circuit

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