Phosphate rock and methods proposed for its utilization as a fertilizer . AS A FERTILIZER By WILLIAM H. WAGGAMAN and WILLIAM H. FRY CONTENTS Introduction Phosphate Deposits of the United States Forms in which Phosphoric Acid is Ap-plied to Soils . „v Processes for Treating Phosphate Rockin the Manufacture of Phosphoric Acidand Phosphatic Fertilizers Processes for the Production of Phos-phoric Acid or Soluble Phosphates byCombined Heating and Acid Treatment Double Decomposition by Means of anAlkali, an Alkali Salt, or Alkaline Earth. Processes to be Used in Connectionwith the Iron and Steel Ind


Phosphate rock and methods proposed for its utilization as a fertilizer . AS A FERTILIZER By WILLIAM H. WAGGAMAN and WILLIAM H. FRY CONTENTS Introduction Phosphate Deposits of the United States Forms in which Phosphoric Acid is Ap-plied to Soils . „v Processes for Treating Phosphate Rockin the Manufacture of Phosphoric Acidand Phosphatic Fertilizers Processes for the Production of Phos-phoric Acid or Soluble Phosphates byCombined Heating and Acid Treatment Double Decomposition by Means of anAlkali, an Alkali Salt, or Alkaline Earth. Processes to be Used in Connectionwith the Iron and Steel Industries . Page1 12 12 14 Page Processes in which the Phosphorus orPhosphoric Acid is Volatilized . . Processes Dealing with the Productionof Two or More Fertilizer Elements . Processes Dealing with the Productionof Available Phosphates by Electrolysis Processes for the Enrichment of Phos-phates Mechanical Treatment of Phosphates . Miscellaneous Processes for the Produc-tion of Available Phosphates .... Appendix: Classified Tabular List ofPatented Processes 15 17. WASHINGTONGOVERNMENT PRINTING OFFICE 1915 UNITED STATES DEPARTMENT OF AGRICULTUREphosphaterockmet312wagg


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