Bulletin Volume 301-325 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1917 Excerpt: ... acid. The claims made for some of theso processes aro not justified, while many other processes are entirely impractical from a commercial standpoint. Much unnecessary labor has been expended in repeating experiments and in devising processes and apparatus already invented, when a thorough acquaintance with existing methods would have saved both time and money. It is thought, therefore, that classified lists of the processes devised for the manufacture of phosphatic fertilizers arranged in chronological order, and giving short abstracts of the processes or apparatus employed, the treatment proposed, and the results or new features claimed by the inventors, will aid materially those engaged in researches of this character. It is impossible in an article of this kind to give moro than the briefest abstracts or mention of most of the numerous processes on this subject, but those are described more fully which appear to possess features particularly interesting from either a commercial or scientific standpoint. For convenience these various methods for treating phosphate rock may be classified as follows: (1) Acid treatment, which includes the manufacture of superphosphate and phosphoric acid; (2) combined heating and acid treatment; (3) double decomposition by means of a silicate or an alkali; (4) processes used in connection with the steel industry; (5) processes in which the phosphorus or phosphoric acid is volatUizcd; (6) treatment dealing with the production of two or more fertilizer elements; (7) electrolysis; (8) enrichment or concentration of phosphates; (9) processes and apparatus for the mechanical treatment of phosphates; (10) miscellaneous processes. ACID TREATMENT. The production of water-soluble phosphates by the treatment of phosphate rock or bo...