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SimL8 

A user friendly powerful simulation tool for the design and optimization of mineral and material processing unit operations and circuits SimL8 is a software tool developed by Tata Research Development & Design Centre (TRDDC), a division of Tata Consultancy Services, Pune, for simulating mineral processing plant operations, in particular those involving grinding, classification and flotation. This tool is based on more than 15 years of TRDDC experience in modeling, simulation and optimization of mineral processing unit operations and circuits.
The models and simulation optimization strategies employed in SimL8 have been tested extensively in commercial plant environments, in particular the modern plants commissioned and operated by Hindustan Zinc Ltd. , India. Features: Salient features of simulator SimL8 include
Figure 1: Salient features and capabilities of SimL8 Applications SimL8 is a tool for plant engineers/consultants/researchers engaged in design and/or optimization of plant performance for a given objective function, specified in terms of one or more of the following enhancement criteria:
SimL8 performs diagnostics and quality assessment and provides plant improvement strategies with help of three modules of operations, namely data reconciliation, parameter estimation and simulation. Data reconciliation: The collection of data set from the plant is the first step in the analysis, evaluation, simulation, and optimization of the plant performance. But due to errors in measurements and inaccessibility of sampling locations, the data is often inadequate, incomplete and inconsistent for a complete and meaningful evaluation of plant performance. SimL8 utilizes a powerful 2tier data reconciliation algorithm through which minor adjustments are made in the measured data in order to satisfy all the mass balance and consistency constraints. Figure 2: SimL8 output of measured and reconciled plant data of size analysis in feed and discharge of a rod mill The output of this mode of operation leads to:
Parameter estimation: The model parameters for each unit operations are estimated using either reconciled plant data or laboratory data. SimL8 provides an easy to use procedure to carry out the parameter estimation process. Simulation: In the simulation mode, SimL8 provides the user a predictive capability, that is the answer to ‘what if’ kind of questions. Once the model parameters are known, the SimL8 flowsheet becomes essentially a “virtual” plant on the screen, completely defined mathematically. The user can conduct plant trials involving changes in feed specifications, operating conditions, design parameters, modifications in circuit configuration, etc, with help of SimL8. For example, a closed circuit grinding operation can be simulated and optimized with respect to one or more of the following objectives:
Figure 3 : A typical grinding circuit on SimL8 Fig 4: SimL8 output  Cumulative size distribution at various location of grinding circuit Similarly the performance of a flotation circuit can be quantitatively assessed as well as optimized by conducting the following kinds of studies with SimL8:
Figure 5 : A typical flotation circuit on SimL8 Figure 6: SimL8 output – effect of number of rougher cells on lead circuit performance A unique feature of SimL8 is the provision for conducting circuit design and simulation for plants having unit operations which are not at present amenable to rigorous mathematical modeling. For these units zeroth level models are provided for obtaining useful and reliable results. System requirements: HARDWARE
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