HSC Chemistry In The Mining Area Water Balance Calculations

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HSC Chemistry in the mining area waterbalance calculationsTuukka Kotiranta

Content of the presentation Water & mining industryWhat is HSC Chemistry?How HSC Sim can be used?Steady state simulation.Importing initial data to HSC Sim.Simple exampleHSC Sim future development2 Outotec – All rights reserved8/27/2015HSC Chemistry, Tuukka Kotiranta

Water & Mining Industry Water can be a limiting factor indeveloping and ongoing miningoperations Water availability is no longerguaranteed and consumption needs tobe carefully considered and planned Many mining operations are located inareas of water stress, where it iscrucial to reuse and recycle waterwithin operations. Some regions may have a surplus ofwater, due to high rainfall, leading toissues associated with storage anddisposal on site. Current trend of ever tighteningenvironmental regulations lead to theneed for more advanced treatmenttechnologies Outotec – All rights reservedMining in water stress areasMining in water surplus regions /areas having push towards tighterenvironmental regulations

Introduction HSC Chemistry is a program that contains over 20 modules and thesimulation tool (Sim) is one of them. All modules are independent programs that are made for calculation ofspecific situation, for example: equilibrium composition, eH pH diagrams,heat transfer through a wall, etc. Sim module is one of the most resent modules published in 2006. The simulator has been developed for metallurgical application inmind, but can be used for similar processes. Sim has three type of units: reactions, distributions and particles. Reactions are based on reaction equations (hydrometallurgy). Distributions are based on element distributions (pyrometallurgy). Particles are based on particle size and distribution (minerals processing). Process units are Excel files.4 Outotec – All rights reserved8/27/2015HSC Chemistry, Tuukka Kotiranta

HSC Sim HSC Sim is a steady state simulator. Water balance with impurities can be calculated with steady statesimulator, but the result is the impurity level after few years. The rate of change needs to be calculated with other methods. If most of the solution goes through the tailings pond you will needseparate calculations for winter time and summer time. Or you cancalculate the situation on monthly basis. For multiple calculations HSC Sim has a scenario tool that needs thechanged values as inputs and the result values as outputs. Themethodology is the same as importing information that is presentedin the next slides.5 Outotec – All rights reserved8/27/2015HSC Chemistry, Tuukka Kotiranta

HSC Sim in the mining area water balancecalculations The water balance is very important for the mining areas andsimulation is useful if waters with different quality are going to be putto the same place. When we calculate the process we get the water quality after theprocess and see how the process affects on the water quality. Water treatment circuit capacity can be tested with differentscenarios. We can also test different ideas with the process model, like whathappens if we filter the tailings.6 Outotec – All rights reserved8/27/2015HSC Chemistry, Tuukka Kotiranta

Importing information to HSC Sim In HSC Sim all units are Excelfiles and additional sheets canbe added to the units or tablescan be added to the flow sheet. Information that model needscan be collected to one placeand it can be updated bycopying the data on top of oldone. Copy and paste method iscurrently the best.7 Outotec – All rights reserved8/27/2015HSC Chemistry, Tuukka Kotiranta

Short example The idea of this example is to show what is easy to make with HSCSim. This is something that anyone can make after two days oftraining. The complexity of the model depends on the complexity of themodeled process and in real cases it means quite complex models.Usually it is good to start with a simple model. In this example copper is precipitated with Ca(OH)2 slurry. The input values for the process are collected to one table to enablethe importing information easily.8 Outotec – All rights reserved8/27/2015HSC Chemistry, Tuukka Kotiranta

Example flow sheet9 Outotec – All rights reserved8/27/2015HSC Chemistry, Tuukka Kotiranta

Example of the input data sheet10 Outotec – All rights reserved8/27/2015HSC Chemistry, Tuukka Kotiranta

Future development of HSC Sim HSC is developed continuously. We add new features and improvethe usability of the old ones. HSC is widely used inside Outotec and new functionality is oftendeveloped from our own needs. New features that will be added to HSC Sim shortly, in about half ayear, beta version stage: Dynamic calculation. Possibility to make own DLL type model. New features that are under development stage, current timeschedule is about one or two years: Process unit, possibility to load and save a process area. Makes possibleto simulate plant units and use them inside a new process. Advantage:you need to simulate one plant unit once and you can reuse that. Monte Carlo calculation. OPC connectivity to the automation system or other systems.11 Outotec – All rights reserved8/27/2015HSC Chemistry, Tuukka Kotiranta

Thanks for your attention!12 Outotec – All rights reserved8/27/2015HSC Chemistry, Tuukka Kotiranta

HSC Chemistry is a program that contains over 20 modules and the simulation tool (Sim) is one of them. . HSC is widely used inside Outotec and new functionality is often developed from our own needs. New features that will be added to HSC Sim shortly, in about half a

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