Chemistry plays a more important role in milling operations than is generally recognized, particularly in fluid-solid separation processes. Chemical aspects are also very important insofar as plant water quality is concerned, and in the manner in which this water quality effects plant design and operation.
One aspect of the use of mining chemicals which has received scant recognition is the realization that in many cases, the equipment in which the chemical is to be used must be designed specifically for use with the chemical, or the equipment, or its method of operation must be modified in order to obtain optimum results. This is especially true of equipment such as filters, thickeners, clarifiers, reagent mixers, reagent feeders and distribution systems, pumps, etc.
Based on the flowsheet, the reasons for these modifications are the following:
- flocculent added at Drag Classifier A could decrease the load going to Thickener D and perhaps improve the centrifuging rates in Centrifuge Z.
- in order to take full advantage of flocculated condition of the thickener underflow.
- it would be desirable to install a filter surge feed tank which would feed the filters by gravity and provide a means for the