. Bulletin of the Department of Agriculture. Agriculture; Agriculture. J^T^ju BULLETIN No. 572 Contribution from .the Bureau of Soils MILTON WHITNEY, Chief. Washington, D. C. PROFESSIONAL PAPER October 5,1917 THE RECOVERY OF THE SH AS A BY-PRODUCT IN INDUSTRY. By William H. Ross, Albert R. Merz, and C. R. Wagner, Scientists in Soil Laboratory Investigations. CONTENTS. Page. Introduction 1 Potash in raw materials and loss through volatilization in cement manufacture 3 Percentage of volatilization of potash in cement plants 11 Reliability of the results obtained 14 Estimated percentage of p
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. J^T^ju BULLETIN No. 572 Contribution from .the Bureau of Soils MILTON WHITNEY, Chief. Washington, D. C. PROFESSIONAL PAPER October 5,1917 THE RECOVERY OF THE SH AS A BY-PRODUCT IN INDUSTRY. By William H. Ross, Albert R. Merz, and C. R. Wagner, Scientists in Soil Laboratory Investigations. CONTENTS. Page. Introduction 1 Potash in raw materials and loss through volatilization in cement manufacture 3 Percentage of volatilization of potash in cement plants 11 Reliability of the results obtained 14 Estimated percentage of potash in the flue dust from different plants 15 Ratio of potash to soda in cement dust 17 Potash-producing plants in the United States. 18 Acknowledgment 22 Summary 22 INTRODUCTION. The present work is a continuation of an investigation that has been in progress in this laboratory for several years on the practica- bility of recovering potash from silicate rocks. Early in the investi- gation the conclusion was reached that owing to the small percentage of potash in commercial grades of any insoluble potash silicate, no process for recovering potash from such material can offer much promise of profitable application unless at the same time some product of value is recovered in addition to the potash. This principle now seems to be more or less generally recognized, and in the numerous patents that have appeared during the last two or three years on the subject of decomposing feldspar and other potash silicates specifications are given in most cases for the recovery, in addition to potash, of one or more of such various products as compounds of aluminum and of silicon, cement, raw material for the manufacture of glass or pottery, structural material, and pigment. In a publication * prepared about five years ago, it was shown that when 1 part of feldspar and 3 parts of calcium carbonate were ignited about an hour at a temperature of 1,300-1,400°, the potash in the 1 Ross, "W
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