KR880001551A - Granular potassium sulfate and its manufacturing method - Google Patents

Abstract

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Description

Granular potassium sulfate and its manufacturing method

As this is a public information case, the full text was not included.

1 to 3 are working systems of the apparatus used in the method of the present invention.

Claims (17)

0.5 to 2 equivalents of calcium hydroxide, calcium oxide, calcium carbonate, magnesium hydroxide, magnesium oxide, and carbonate to modified potassium sulfate containing unreacted sulfuric acid powder obtained by dry reaction of potassium chloride and sulfuric acid. Potassium sulfate granulated by wet granulation with magnesium or ammonia added. 0.5 to 2 equivalents of calcium hydroxide, calcium oxide, calcium carbonate, magnesium hydroxide, magnesium oxide, carbonate to modified potassium sulfate containing unreacted sulfuric acid powder obtained by dry reaction of potassium chloride and sulfuric acid. A granulation method of granular potassium sulfate, comprising wet or granulating with magnesium or ammonia. 0.5 to 2 times equivalents of calcium hydroxide, calcium oxide, calcium carbonate, magnesium hydroxide, magnesium oxide, or carbonate to modified potassium sulfate containing unreacted sulfur sand powder obtained by dry reaction of potassium chloride and sulfuric acid. Granular potassium sulfate formed by compression molding by addition of at least one powdered neutralizing agent selected from magnesium and wet granulation of the powder obtained by pulverizing the molded article. 0.5 to 2 equivalents of calcium hydroxide, calcium oxide, calcium carbonate, magnesium hydroxide, magnesium oxide or magnesium carbonate to modified potassium sulfate containing unreacted sulfuric acid powder obtained by dry reaction of potassium chloride and sulfuric acid. Method for producing granular potassium sulfate, characterized in that the compression molding by adding at least one powdered neutralizing agent selected from the above, and then wet granulated after grinding the molded product. The method of claim 4 wherein compression molding is carried out in a roll-press, solidifier, extruder or granulator. The method of claim 4 wherein the wet assembly is carried out with a dish granulator, a drum granulator or an extruder. 5. The method according to claim 4, wherein water, potassium aqueous solution or potassium sulfate slurry is added so that the granulated water during wet granulation (2 to 20% by weight of the non-dried wet granulated product is 2 to 20% by weight). The method according to claim 4, wherein the wet granulated product is classified after coarse to obtain granular potassium sulfate, and the oversized product is pulverized, but the undersized product is not pulverized or pulverized and circulated in a wet granulator. To the modified potassium carbonate containing unreacted sulfuric acid powder obtained by the dry reaction of potassium chloride and sulfuric acid, one or more neutralizing agents selected from 0.5 to 2 times equivalents of calcium hydroxide, calcium oxide or calcium carbonate are added to the unreacted sulfuric acid powder. Granular potassium sulfate formed by wet-neutralization, drying and grinding a neutralized product, and then wet granulation. At least one neutralizing agent and water selected from 0.5 to 2 equivalents of calcium hydroxide, calcium chloride or calcium carbonate to modified potassium sulfate containing unreacted sulfuric acid powder obtained by dry reaction of potassium chloride and sulfuric acid. A method for producing granular potassium sulfate, characterized in that the wet granulation is carried out by addition, wet neutralization, drying and pulverizing the neutralized product. The method according to claim 10, wherein the amount of water added during wet neutralization is 2 to 20% by weight with respect to modified potassium sulfate. The method according to claim 10, wherein the neutralized dry ground product and the wet neutralized product are mixed in a weight ratio of the neutralized dry ground product 2: 1 or more. A granular potassium sulfate formed by wet granulation by adding 0.5 to 1.2 times the equivalent of ammonia to unreacted sulfuric acid to modified potassium sulfate containing unreacted sulfuric acid powder obtained by dry reaction of potassium chloride and sulfuric acid. Preparation of granular potassium sulfate, wet granulation is performed by adding 0.5 to 1.2 times the equivalent of ammonia to unreacted sulfuric acid to modified potassium sulfate containing unreacted sulfuric acid, which is obtained by dry reaction of potassium chloride and sulfuric acid. Way. 15. The method according to claim 14, wherein water or ammonia water is used as coarse water in wet assembly. 15. The method of claim 14, wherein the wet granulation is carried out with a dish dryer, a drum granulator or an extruder. 15. The method of claim 14, wherein the wet granulated product is classified into sieves after drying to obtain granular potassium sulfate, and the oversized product is pulverized, while the undersized product is circulated in the wet granulator with or without pulverizing. ※ Note: It is to be disclosed based on the initial application.