Method of preparation of multicomponent fertilizers
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United States of America Patent
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Mar 23, 1982
Grant Date -
N/A
app pub date -
Apr 2, 1980
filing date -
Jun 27, 1979
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The subject of the invention is the method of preparation of multicomponent fertilizers based upon the decomposition process of mineral phosphate material by ammonium sulphate and sulphuric acid. This method has application in chemical industry. The invention concerns the method of preparation of multicomponent fertilizers relying upon the decomposition of mineral phosphate material by sulphuric acid and ammonium sulphate. The basis of the method relies upon the mineral phosphate material undergoing wet milling with the acid and sulfate and as a result of which mechanically-induced chemical processes occur the decomposition of the apatite structure of material takes place. The milled mixture is introduced into reactors-crystallizers, where further decomposition of the phosphate material and phosphate gypsum crystallization takes place. The reactive pulp is filtered off and phosphate gypsum after counter-current washing is directed to prepare processing for chalk and recover ammonium sulphate solution, part of which latter is used for counter-current washing of sulphate gypsum. The washing liquor is introduced to the process of fertilizer preparation; the remaining part of the sulfate solution in quantity of 30 to 70% of total amount is re-introduced to the initial wet milling process of the phosphate material. It is also possible to introduce to the reaction system the solution of ammonium sulphate, being a waste in other technologies like caprolactam, titanum white or acrylonitrile. In the variant of the method of multicomponent NPK fertilizers preparation, mineral phosphate material undergoes wet milling in solution of ammonium sulphate and sulphuric acid with maintaining the weight ratio of sulphuric ion to acid within the range from 0.35 to 1.2 and the weight ratio of phosphate material to sulphate ion from 0.9 to 1.5. To the milled suspension inorganic compounds containing nitrogen and potassium in quantity of 80 to 120% w/w in relation to phosphate material are added, yielding after granulation and drying complex NPK fertilizer.
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