The hydrometallurgy of copper . dump cars and hauled by horses to theend of an inclined troughed belt conveyor which raises it to the top ofthe crushing plant. Here it is wet crushed in a breaker and Chili millsto yield a pulp containing 33 per cent, dry solids and having 50 per cent. CHEMICAL PROCESSES 189 material fine enough to pass through a 136-mcsh screen. This pulp isconducted by wooden launders to the leaching vats. Fig. 4.5 representsa general plan and section of the leaching and precipitating plant. Thisconsists first of 10 leaching tanks 184X42X6 1/2 ft. deep. These tanksare erected
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The hydrometallurgy of copper . dump cars and hauled by horses to theend of an inclined troughed belt conveyor which raises it to the top ofthe crushing plant. Here it is wet crushed in a breaker and Chili millsto yield a pulp containing 33 per cent, dry solids and having 50 per cent. CHEMICAL PROCESSES 189 material fine enough to pass through a 136-mcsh screen. This pulp isconducted by wooden launders to the leaching vats. Fig. 4.5 representsa general plan and section of the leaching and precipitating plant. Thisconsists first of 10 leaching tanks 184X42X6 1/2 ft. deep. These tanksare erected on a rock foundation, and have masonry walls, covered with4 in. of concrete, then 1 in. of reinforced asphalt. The asphalt coveringhas lasted successfully for 2 years and has been subjected to temperaturesfrom —40 to 102° F. The plant is operated in the warmer months only.Each leaching tank is charged in 8 hours with pulp containing 200tons dry material. The pulp during this time receives 13.2 tons of 53°B. Elevated Tallin. Ckiir a.pi^rKsoln. Dleili TuillDgfl Diflcbarge level to Pump Section tkrougli G-H Fig. 45.—Copper leaching plant at the Gumeshevesky Mine, Russia. sulphuric acid which is run into the tank, after which the stirring arms ofan agitator are lowered into it. This machine is furnished with fivevertical shafts, each having a stirring arm at its lower end. The agitatoris moved from end to end of the tank and stirs the pulp for 9 hours.The material in the tank is then allowed to settle, the clear solution isdecanted through the launders to the precipitation tanks. Wash water isrun in to fill the tank, the pulp is again agitated for 4 hours, allowed tosettle, and the solution decanted as before. Four washes and decantationsarc thus made. The tank is provided with a side door through which thetailings are discharged, while they are kept in suspension by means ofthe agitator. Care must be taken to add sufficient water to make atleast 2 1/2 parts of water to 1 of