Abstract: An energy efficient process and apparatus is described that allows production of concentrated polyphosphate containing ammonium phosphate suspension fertilizers that can be stored and handled at temperatures well below 0.degree. F. Ammoniation of the merchant-grade wet-process phosphoric acid provides all of the heat required by the process. Use of a unique enlarged dual pipe-type reactor system allows operation for extended periods without clogging. To obtain the high concentration and excellent low temperature storage and handling properties, the ammonium phosphate must be produced within closely specified and previously undisclosed N:P.sub.2 O.sub.5 and solution concentration ranges. Operation outside the specified composition range will reduce the maximum plant food concentration and may cause some of the ammonium phosphate salts to crystallize and foul the heat-transfer surfaces.

Abstract: A stable liquid fertilizer solution containing nitrogen, phosphorus, iron and optionally sulfur is prepared by mixing a water-soluble iron compound with ammonium polyphosphate and water to produce an iron phosphate slurry having a molar ratio of polyphosphate phosphorus to iron of at least about 2:1, adding ammonia to the iron phosphate slurry to produce a solubilized iron complex; and adding an inorganic acid to the iron complex solution. The amount of acid added is generally that which brings the pH of the fertilizer solution to within the range of about 5.5 to 7.0.

Abstract: A process is disclosed for the absorption of gaseous or liquid ammonia in acid solutions or slurries, including an ammonia absorption zone separated from a water vapor generation zone disposed at a higher level. A pressure difference is created between the two zones, so that the ammonia absorption takes place completely in the neighborhood of the point of inflow of the ammonia, with a temperature increase localized only near to said inflow point, and thus without giving rise to the generation of water vapor which therefore takes place in a liquid-vapor separation zone located at a higher level with respect to the ammonia absorption zone. The acid solutions or slurries to be neutralized may consist essentially of solutions of phosphoric acid, sulphuric acid, nitric acid, solutions resulting from the nitric acid attack on phosphorites, acid slurries resulting from nitric acid attack or sulphonitric acid attack on phosphorites, or mixtures thereof.

Abstract: A one vessel process for manufacturing stable ammonium phosphate fertilizer utilizes a spray reactor in which phosphoric acid is reacted with ammonia to form ammonium phosphate. The ammoniation is conducted under conditions which form sufficient ammonium polyphosphate to stabilize the solution in the liquid condition. The liquid may be stored and transported without substantial solidification or crystalization so that the product may be subsequently used as an ammonium phosphate fertilizer.

Abstract: A process for producing potassium magnesium phosphate from phosphoric acid, potassium chloride and magnesium oxide, carbonated or like alkaline magnesium compound, which comprises adding the magnesium compound to an aqueous solution of the phosphoric acid or the acidic soluble phosphate salt and an amount of potassium chloride in excess of that theoretically required, in an amount and at a rate such that the pH is maintained below 9 and a high ratio of potassium chloride to magnesium chloride is maintained in the reaction mixture, whereby the formation of tribasic magnesium phosphate is suppressed.

Abstract: An improved process is described for preparing defluorinated phosphate rock (DPR) granules from fluorine-containing phosphate rock.

Abstract: A water soluble mixed fertilizer composition in solid form and a method of producing the fertilizer composition. The fertilizer comprises a mixture of urea, phosphoric acid and at least one potassium salt selected from the class comprising potassium sulphate, potassium nitrate and potassium chloride. Ammonium salts selected from the class comprising ammonium nitrate and ammonium sulphate may optionally also be added to the mixtures. Solid fertilizer compositions possible according to this invention include compositions which contain between 5 and 42% nitrogen, between 2 and 15% phosphorus and between 1 and 38% potassium, these values being elemental mass as a percentage relative to the total mass of the composition.

Abstract: An alkaline high temperature process for the production of alkali containing highly citrate soluble calcined phosphate fertilizer is disclosed. The process comprises calcining a preheated mixture comprising a crude phosphate, an alkaline decomposing agent, silicic acid and phosphoric acid in a rotary kiln at a temperature of between about 900.degree. and 1300.degree. C. The preheated mixture is prepared by introducing phosphoric acid directly into the kiln and therein contacting it with the hot precursory mixture of the remaining starting material having a temperature of between about 150.degree. to 900.degree. C. The amounts of starting materials are preferably chosen such that in the mixture 1 mole of P.sub.2 O.sub.5 is present per about 1.1 to 1.8 moles of alkali oxide, and about 0.5 moles of SiO.sub.2 are present per mole of CaO which is in excess of the amount of CaO which can be bound in the form of calcium alkali phosphate.

Abstract: Monocalcium phosphate, phosphoric acid and/or potassium phosphate containing fertilizers are produced in a process involving acidulation of phosphate rock with phophoric acid in the presence of added silicon dioxide and potassium ion whereby fluorides contained in the rock are converted to K.sub.2 SiF.sub.6, wherein monocalcium phosphate dissolved in phosphoric acid is formed during acidulation. In an important feature, the K.sub.2 SiF.sub.6 is separated and hydrolyzed to regenerate the K.sub.2 O from K.sub.2 SiF.sub.6 as recycled KH.sub.2 PO.sub.4 /H.sub.3 PO.sub.4 solution for further reaction with fluoride from fresh phosphate rock feed. A portion of the MCP/H.sub.3 PO.sub.4 solution and/or crystallized monocalcium phosphate can then be reacted with potassium sulfate, potassium bisulfate, or mixtures thereof, to form KH.sub.2 PO.sub.4, or KH.sub.2 PO.sub.4 /H.sub.3 PO.sub.4 solutions, and gypsum. In a closely related embodiment, the remaining MCP/H.sub.3 PO.sub.

Abstract: A process for the production of a potassium polyphosphate liquid fertilizer in which potassium chloride is reacted with phosphoric acid or polyphosphoric acid in a specific molar ratio, steam, air or other inert gas being blown through the reaction mixture to facilitate removal of hydrochloric acid. The reaction product is dissolved in water or a weak solution, of a liquid ferilizer, the pH adjusted and the resulting solution or slurry is suitable for direct use as a solution fertilizer.

Abstract: Process for producing triple superphosphate by reacting dilute phosphoric acid and lime, limestone or dolomite and granulating the resultant product.

Abstract: Crude phosphate is leached with nitric acid to produce an acid slurry, which is thereafter neutralized with ammonia in two successive stages while simultaneously cooling it and adding acid, part of the crude phosphate phosphorus being replaced with phosphoric acid added to the slurry to be neutralized, and in such a manner that at maximum 40% of the phosphoric acid is fed to the first neutralization stage and the rest is fed to the second neutralization stage, whereby the acidity of the slurry is adjusted to pH 2.5 - 4.5 during the first and to pH 5.0 - 6.0 during the second neutralization stage.

Abstract: The invention relates to a process for the manufacture of solid monammonium phosphate in a suitable form for use as an ingredient in the granulation of NPK compound fertilizers. It has been found that some wet-process phosphoric acids used in the manufacture of fertilizer grade ammonium phosphate contain impurities in amounts and/or ratios which can give rise to hard oversize product in known methods of manufacture with the result that extra milling of the product is required. The process of the invention overcomes the need for extra milling by providing an improved product form. The improvement is achieved by mixing separately at one stage in a process of the kind described between 15% and 85% by volume of the total secondary acid feed with the aqueous ammonium phosphate slurry and adding the remainder of the secondary acid to the treated slurry at a later stage.

Abstract: Phosphate enriched, potassium supplemented peat moss fertilizer produce and method of production including reaction of peat moss with a solution of alkali metal acid phosphate salt in orthophosphoric acid, in some cases with prolonged hydrolysis reaction at elevated temperatures to hydrolyze peat moss protein to free amino acids.

Abstract: Phosphate enriched, potassium supplemental manure product and method of production including reaction of manure with a solution of alkali metal acid phosphate salt in orthophosphoric acid, in some cases with prolonged reaction at elevated temperatures to hydrolyze manure protein to free amino acids.

Abstract: Novel feed grade calcium phosphate compositions are provided which contain calcium chlorophosphate in varying amounts. This novel composition and other heretofore known varieties of feed grade calcium phosphates are prepared by low temperature drying steps (spray drying or crystallization-evaporation) of solutions or slurries which have been partially defluorinated to the extent that the solution P/F ratio is at least 30-35 but less than 100. The novel compositions described above have adequate levels of phosphorus availability to animals thereby permitting their usage as an animal feed supplement.

Abstract: The preparation of isobutylidenediurea from isobutyraldehyde and urea, the particle size of the product being controlled by alternate use of sulfuric acid and phosphoric acid.

Abstract: A method of producing phosphorus-containing fertilizers, wherein the phosphate raw stock is treated with a mineral acid selected from the group, consisting of phosphoric acid, sulphuric acid and a mixture of both. The thus-obtained suspension of the phosphorus-containing fertilizers is acted upon by acoustic vibrations at a frequency of from 500 to 20,000 Hz and a second energy density of from 0.5 to 5 W/cm.sup.2, whereupon the end product is isolated.

Abstract: An energy efficient process and apparatus is described that consists of a pipe reactor, melt dissolution tank, acid and ammonia heat exchangers, product cooler, and clay addition facilities in which a concentrated polyphosphate containing ammonium phosphate suspension fertilizers is produced that can be stored and handled at temperatures well below 0.degree. F. The suspension is produced from merchant-grade wet-process phosphoric acid which is ammoniated in a unique enlarged pipe-type reactor sized to have throughputs of 20-100 pounds P.sub.2 O.sub.5 /hr-in.sup.2 and 0.25-2 pounds P.sub.2 O.sub.5 /hr-in.sup.3 of internal reactor area and volume, respectively, and which can be operated for extended periods without clogging. All of the heat required by the process is obtained by transferring a portion of the heat of ammoniation from the hot liquid in the melt dissolution tank to the incoming acid and ammonia streams. The resultant product contains 10 to 40 percent polyphosphate and when produced within an N:P.