Aer ia l view shows the complete Phosphoric Acid Plant of The Bunker Hil l Company at Kel logg, Idaho. Three 35 ' Dorr Storage-Clari f iers are seen in the fo reg round .

SO2 from zinc plant opens way for phosphoric acid production at

THE BUNKER HILL CO. Another example of Dorr-Oliver engineering

Operated in conjunction with the Company's important zinc reduction facilities nearby, the new Phosphoric Acid Plant of The Bunker Hill Company, Kellogg, Idaho, was con­structed in 42 weeks, and very quickly achieved capacity and efficient operation. The plant has a design capacity of 130 tpd of 54% P2 0 ; product acid (70 tpd P2 0 5 ) .

The Dorrco Strong Phosphoric Acid Process is used, utiliz­ing Western phosphate rock and sulphuric acid manufactured from SOo gas from the zinc plant roasting operation. Com­plete engineering, plant design, purchasing of equipment and supervision of erection and initial operation were handled by the Dorr-Oliver organization.

Selection of Dorr-Oliver was based on over 40 years of experience in constructing wet process P2 05 and complete fertilizer plants throughout the world. For information on the complete range of D-0 engineering services available to the Fertilizer Industry, write to Dorr-Oliver Inc., Stamford, Connecticut.

Top view of newly-developed Dorr-Ol iver Single Tank Reac­tor used in this p lant for the first t ime.

The ent ire plant operat ion is control led f rom this central instrument panel .

V V V' W O R L D - W I D E R E S E A R C H • E N G I N E E R I N G • E Q U I P M E N T

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DORR-OLIVER