. Bulletin of the Department of Agriculture. Agriculture; Agriculture. BULLETIN OF THE SMTOFAMJIi No. 143 Contribution from the Bureau of Soils, Milton Whitney, Chief November 13, 1914. PROFESSIONAL PAPER. THE PRODUCTION AND RIC-SOLXJBLE FERTILIZER VALUE OF CIT- IC ACID AND POTASH. By Wm. H. Waggaman, Scientist in Investigation of Fertilizer Resources. INTRODUCTION. The extraction of potash from silicate rocks or the rendering of this alkali soluble in water has been and probably will continue to be for a long time the object of numerous investigations. Ross1 has investigated many of thes
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. BULLETIN OF THE SMTOFAMJIi No. 143 Contribution from the Bureau of Soils, Milton Whitney, Chief November 13, 1914. PROFESSIONAL PAPER. THE PRODUCTION AND RIC-SOLXJBLE FERTILIZER VALUE OF CIT- IC ACID AND POTASH. By Wm. H. Waggaman, Scientist in Investigation of Fertilizer Resources. INTRODUCTION. The extraction of potash from silicate rocks or the rendering of this alkali soluble in water has been and probably will continue to be for a long time the object of numerous investigations. Ross1 has investigated many of these processes and discussed several in some detail. For convenience he divides them into three classes, as follows: (1) Processes which yield potash as the only product of value; (2) processes which yield potash and some other salable material as a by-product; (3) processes in which two or more operations are combined in one, yielding a fertilizer containing two or more of the constituents, potash, phosphoric acid, and nitrogen. He describes two methods for obtaining potash from feldspar by treating mixtures of that mineral and lime, collecting the potash thus liberated, and using the residue for the manufacture of cement. The potash obtained by these processes, however, is in the form of oxide or hydroxide, and is therefore more valuable for other purposes than for the manufacture of fertilizers. Ross also tried heating together feldspar and lime with the addition of phosphate rock, but found that the latter substance did not enter into the reaction, there being no increase in the quantity of potash thus obtained over that produced by the ignition of feldspar and lime alone. The production in a single operation of available phosphoric acid and potash from insoluble minerals, however, presents possibilities which are particularly attractive, and several processes have been devised to accomplish this end. It is the purpose of this paper first to discuss these existing methods and
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