Classification Equipment

Classification equipment (Classifying tanks) is used to separate fine material down to 200 mesh (use Log washers and coarse screws to separate more coarse materials).

The classifier process is based upon the settling rates of different-sized material as it enters the classifying tank. The tank receives slurry from upstream and separates it into two products: Product A (one specification) and Product B (a different specification). Whatever material remains after the two products becomes waste or becomes overflow depending on the overflow split point selected..

AggFlow DM calculations assume classifying tanks operate 100% efficiently at all separation points - making the maximum amount of Product A and Product B while minimizing waste.

Install Classifying Tank

To Setup and Adjust the Classifying Tank

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Water Added - controls the amount of water. Incoming water is the water in the material feed, Added water is additional water that will be added to the water balance, re-circulating water is water recirculated in the tank that is not added to the water balance, total water is the water the sum of these, and required minimum is the manufacture recommendation.
Minimum water requirement can be user set using the Set Minimum Water Requirement button. When the simulation is run the warning will be based on this setting.
Product - is divided by tabs for incoming material flow, product A and B, Waste being excess material, and tank overflow. When the simulation is run, the incoming flow is available to perform calculations. Each tab will show the percentage of material that is in each flow stream based on Mass Rate. Recalculate will update the values. Product tabs are used to view calculations and specifications.
Graph - is located below the product tabs and is shown for the product tab selected. The graph will include the specification upper and lower limits for Product A and B.
Specification Definition- Specifications need to be selected for products A and B. For input, waste and overflow tabs, the gradations and Tph will be shown for the calculated result. Specifications can be entered directly on the page by changing the numbers in the min-max column, or a new user specification can be created and inserted using the Insert Specification button to select, review and modify specifications. When the specification is changed by changing the values in the min-max columns, a user defined specification is created in the version database. See Database Menu Specifications.
Operation of the classifier can also be controlled by setting the Maximum % Retained, Priority and FM limits for product A and B.
Overflow - Selecting the overflow tab will allow adjustment of the % of product below the split point to be added to the waste product stream. To adjust the split point requires adjustment of the water flow into the tank.
Recalculate - will refresh the calculation based on the input feed gradation from the simulation. If the input feed gradation is changed the simulation will need to be run. The numbers in the tab will turn red if a setting is changed to show that a recalculation is required.

Follow these steps to set up the classifying tank.

Select the classifying tank, right-click and choose Adjust Setup from the short-cut menu.
Adjust water rates as needed. Use the Set Minimum Water Requirement button to set the water required per ton of material for this machine.
Select the tabs to review and adjust settings:
- Product A: Define the specification and other options for product A in the table at right.
- Product B: Define the specification and other options for product B in the table at right.
- Waste: Review solid, liquid and slurry rates in the waste stream.
  It is important to review the waste stream output for material sizes that are missing (for example has a TPH of 0 or 0.1).AggFlow DM calculates the material mix to meet the defined specification. By making adjustments upstream to create more of the missing material sizes, it is possible to increase the total amount of product and stay within specification. By refining the plant settings upstream to make more of the missing sizes, less material will be put into the waste stream when it is separated by the classifier.
- Overflow: Adjust the Split Point as desired and review solid, liquid and slurry rates in the overflow stream. The split point is controlled by the amount of water coming into the tank, the amount of water added to the classifying tank, and the amount of water recirculated. As you modify the amount of water added and recirculated, the overflow results are automatically updated. Use the Recalculate button to see the effect of changing the water amounts on products A and B.