U.S. Department of the Interior

D. S. Kostick, SodaMsh and Sodium Sufate Minerals Yearbook—1988, U.S. Department of the Interior, Washiagton D.C., 1988. 

Quantities of potassium sulfate produced and consumed as potassium magnesium sulfate [13826-56-7] K2S0-2MgS04, are omitted in the U.S. Department of the Interior reports as classified information. Consumption data for potassium compounds identified as other potassium salts imply that the amount of potassium magnesium sulfate consumed in the United States is about double that of K SO. This gap is expected to widen as soils become more depleted of natural magnesium- and sulfur-containing minerals. 

R. C. Weisner, J. E. Lemons, Jr., and L. V. Coppa, Valuation oJPotash Occurrence Within the Nuclear Waste Isolation Pilot Plant Site in Southeastern Neir Mexico, U.S. Department of the Interior, Bureau of Mines, Washington, D.C., 1980, p. 6. 

Seawater Evaporators The production of potable water from saline waters represents a large and growing field of application for evaporators. Extensive work done in this field to 1972 was summarized in the annual Saline Water Conversion Repoi ts of the Office of Sahne Water, U.S. Department of the Interior. Steam economies on the order of 10 kg evaporation/kg steam are usually justified because (1) unit production capacities are high, (2) fixed charges are low on capital used for pubhc works (i.e., they use long amortization periods and have low interest rates, with no other return on investment considered), (3) heat-transfer performance is comparable with that of pure water, and (4) properly treated seawater causes httle deterioration due to scahng or fouhng. 

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