Example - 06 OLI Projects

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Navigation: User Guide ➔ Example Projects ➔ 06 OLI

This page is for examples which are present in SysCAD 9.3 Build 137 or later.


Demo OLI Lithium Carbonate Acid Leach Project

OLI1.png OLI2.png
OLI3.png These images have been updated to the SysCAD 138 version.


Project Location
..\SysCADXXX\Examples\06 OLI\Demo OLI Lithium Carbonate Acid Leach Project.spf

Features demonstrated

  1. The use of OLI Chemistry Model
  2. The use of OLI Reactor to perform side calculations
  3. The use of Thickener model
  4. The use of Filter Press model
  5. The use of Composition Fetch in Feeder model
  6. The use of Makeup Sources and Makeup Blocks
  7. The use of Reaction Blocks, including the use of Heat Exchange, Override Product Temperature Option and Final Flow extent type
  8. The use of Set Tag Controllers
  9. The use of a PID Controller
  10. The use of EHX
  11. The use of Split Flows Gas Vent option

Brief Project Description

  • This is a simplified model of a Lithium Carbonate plant. The project is based on the Quebec Lithium Project in Canada, as described in "Technical Report NI 43-101 on the Pre-Feasibility Study for the Quebec Lithium Project", by Canada Lithium Corporation and BBA Inc, May 2010, which was downloaded from the Sedar website (http://www.sedar.com/DisplayCompanyDocuments.do?lang=EN&issuerNo=00007891).
  • It is very similar to the Demo Lithium Carbonate Acid Leach Project except in a couple of places it uses OLI to predict reaction extents and pH.
  • Four parts of the process are mimicked in OLI Reactors using the Composition Fetch functionality in the feeders and Set Tag Controller to transfer results to corresponding reaction blocks. The four processes are:
    • Water Leach
    • Hydroxide Precipitation
    • Manganese Precipitation
    • Lithium Carbonate Precipitation
  • Dried spodumene concentrate is fed into the Decrepitation Kiln, where alpha-spodumene is converted to beta-spodumene and any water present is evaporated. These reactions occur at 1050 deg C.
  • The solid product is cooled to 60 deg C in the Cooler.
  • Cooled solid product is mixed with concentrated sulfuric acid in the Acid Mixer.
  • The slurry from the Acid Mixer is fed to the Sulphatation Kiln where the beta-spodumene is converted to solid lithium sulfate by reacting with the sulfuric acid. Oxide impurities are also converted to their sulfate forms by reaction with sulfuric acid. These reactions occur at 250 deg C.
  • Some excess water is converted to gas. All gases are vented.
  • The kiln solids, along with leftover acid, pass to the Water Leach Tank where water is added.
  • The majority of the reactions in the Water Leach Tank are set by the Leach Control controller which measures the results generated by OLI in the OLI Water Leach OLI Reactor.
  • The slurry is thickened and send to a drum filter where it is washed with process water. The washed filter cake is sent to the Tailings Pond.
  • The filtrate and thickener overflow are combined and sent to the purification processes.
  • The pH of the lithium sulfate solution is raised from around 3 to around 6 by the addition of Lime. The pH is calculated by the corresponding OLI Reactor, OLI Hydroxide Precip, and the addition of the Lime is controlled by a PID Controller.
  • The Lime neutralises most of the acid present as well as participating in precipitation reactions.
  • The majority of the reactions in the Hydroxide Precip Tank are set by the Purific1 Control controller which measures the results generated by OLI in the OLI Hydroxide Precip OLI Reactor.
  • The resulting slurry is thickened and send to a drum filter where it is washed with process water. The washed filter cake is sent to the Tailings Pond.
  • The filtrate and thickener overflow are combined and sent to the second stage of purification.
  • The pH of the solution is raised to 10 by the addition of Caustic Soda (NaOH). The pH is calculated by the corresponding OLI Reactor, OLI Mn Precip, and the addition of the NaOH is controlled by a PID Controller.
  • The NaOH both neutralises all remaining acid present as well as participating in precipitation reactions. Soda Ash is also added to aid in the precipitation of carbonates.
  • The majority of the reactions in the Mn Precip Tank are set by the Purific2 Control controller which measures the results generated by OLI in the OLI Mn Precip OLI Reactor.
  • The resulting slurry is thickened and send to a drum filter where it is washed with process water. The washed filter cake is sent to the Tailings Pond.
  • The filtrate and thickener overflow are combined and sent to the lithium carbonate precipitation tank which is maintained at 95 deg C.
  • Soda Ash is added to convert the lithium sulfate to lithium carbonate (which precipitates), as well as precipitate other carbonates.
  • The majority of the reactions in the Li2CO3 Precip Tank are set by the Precip Control controller which measures the results generated by OLI in the OLI Li2CO3 Precip OLI Reactor.
  • The resulting slurry is thickened and send to a drum filter. The thickener overflow is sent to the Tailings Pond.
  • The thickened slurry is washed with process water (also at 95 deg C) in the drum filter. The washed filter cake is sent to the dryer, while the filtrate is recycled back to the lithium carbonate precipitation tank.
  • In the dryer, all water is evaporated and aqueous species are returned to the their solid forms. The steam is vented leaving the solid lithium carbonate product.

Project Configuration

  • Most units with reactions are simulated by the Tank model. This includes the Decrepitation Kiln, Sulphatation Kiln, Water Leach Tank, Hydroxide Precip Tank, Mn Precip Tank, Li2CO3 Precip Tank and Li2CO3 Dryer.
  • Four OLI Reactors are used to perform side calculations (using the Side Calc model). The results used include pH and final solid flows to set dissolution and precipitation reactions.
  • The reactions set based on OLI predictions use the Final Flow extent type.
  • Separation of gases and slurry is usually achieved by the use of Split Flows Gas Vent option.
  • Makeup Blocks are used:
    • in the Acid Mixer to add a slight excess sulfuric acid
    • in the Water Leach Tank to add process water to achieve a specified solids fraction
    • in the Hydroxide Precip Tank to add a controlled mass flow of lime solution
    • in the Mn Precip Tank to add a controlled mass flow of NaOH solution
    • in the Mn Precip Tank to add a stoichiometric amount of Na2CO3
    • in the Li2CO3 Precip Tank to add a stoichiometric amount of Na2CO3
  • The Cooler is modelled by a Tank with the EHX sub-model enabled to achieve the desired product temperature
  • All Thickeners are modelled by the Thickener model using the OverFlowSolidsFraction method.
  • All Drum Filters are modelled by the Filter Press model using the SolidsFractionInFiltrate and Constant Wash Efficiency methods.
  • Set Tag Controllers are used to set wash water flows based on user specified ratios to all drum filters and to set final flows of species in reaction blocks (based on OLI predictions).
  • PID Controllers are used to control the Lime and Caustic Soda additions in order to achieve the desired pH, based on OLI calculations of pH.

Included Excel Report

Lithium Acid Leach Example Report.xlsx

This file has the following reports:

  • Criteria
  • Streams
  • Mass Balance