2011-09-27_REVISION - M1990057 (10)

Home Browse Search

Reagents DAF -30 Water Rate Concentrate feed Amount used (2) Amount reclaim (3) 0.0161b /ton (1) 6,150 ton/yr 0.05 ton/yr - 1.5st H /ton 6,150 ton/yr - 9,100 ton/yr Reagents Pine Oil Water Rate Ore feed Amount used (2) Amount used (3) 0.O1gal/ton (1) 56,000 ton/yr 450ga1/yr - 0.6st H /ton 56,000 tons /yr - 31,800 tons /yr The concentrate from the rougher and scavenger flotation cells report to the cleaner flotation circuit, which consists of two, 25" x 24" x29" (20.1 ft tank cells. The tailings from the cleaner flotation circuit report back to the scavenger flotation circuit for additional residence time. The concentrate from the cleaner flotation circuit reports to the concentrate thickener. Reagents are added at the conditioning tank through reagent feeders. As shown in Table C -2, Pine Oil is added as a frother. Pine Oil is diluted from 100% Pine Oil liquid solution. Table C -2: Chemical Usage, Conditioning Tank (56,000 ton/vr Reagent rate based on dry ore feed tonnage (2) US gallons of reagents — annual quantity (3) Liquid US tons of reagents — annual quantity (4) Water is added at rougher flotation cell Concentrate Circuit The concentrate from the 2nd flotation cleaner cell will report to a thickener to maximize the recovery of process water. The thickened concentrate, 65% solids, will go to the concentrate filter. The filter additionally recovers process water. The material is 65% solids entering the filter and 90% solids exiting the filter. Overflow from the concentrate thickener will be returned to the circuit as process water. The concentrate filter gravity discharges its concentrate cake onto a conveyor which transports the concentrate into a 4 ton bin from where it is loaded into super sacks for shipment. The sacks are stored within the facility until shipped. The super sacks are loaded to highway trucks for shipment. This is a 10% moisture product. Dry reagents are added at the thickener through a reagent mixer, diluted with water and added through a chemical feed pump. As shown in Table C -3, DAF -30 is added as a flocculant. Approximately 0.3 lb. of reagent are used per day. Table C -3: Chemical Usage, Concentrate Thickener (56,000 ton/vr Reagent rate based on dry concentrate feed tonnage (11% mass pull to concentrate) (2) Tons of reagents — annual quantity (3) Liquid US tons of reagents — annual quantity (4) Water is reclaimed at thickener and vacuum filter and recycled Tailings Circuit Tailings from scavenger flotation will be sent to a tailings thickener. Thickened underflow will be sent to the tailing storage facility at 65% solids. Overflow from the tailings thickener will be M1990 -057 September 27, 2011