A kind of production method of large particle ammonium sulfate

A production method and technology of ammonium sulfate, applied in ammonium salt fertilizer, nitrogen fertilizer, agriculture, etc., can solve problems such as ammonium sulfate granulation difficulties, and achieve the effects of good product quality, effective use of resources, and control of process conditions

CN106588128BActive Publication Date: 2020-06-09HUBEI SANNING CHEM
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2020-06-09

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Abstract

A method for producing large-particle ammonium sulfate comprises the following steps: step 1, mixing slag slurry produced in a process of wet phosphoric acid production of industrial phosphoric acid with sulfuric acid and a tail washed liquid according to the ratio of (0.5-3):10:(0.1-3) to form a mixed acid; step 2, adding ammonia gas or liquid ammonia or ammonia water to the mixed acid, and carrying out a neutralization reaction to obtain an ammonium sulfate slurry; step 3, sending the ammonium sulfate slurry into a granulator, granulating, and drying; step 4, sieving and grading the large-particle ammonium sulfate obtained by granulation; step 5, treating the finished product ammonium sulfate particles having the particle size of 2-4.5 mm and obtained from sieving, to obtain a finished product, and packaging; and step 6, carrying out circulating water washing of sieved dust-containing tail gas, adding sulfuric acid to the washed water according to the ratio of (4-5):1 and mixing into a dilute sulfuric acid, washing the granulated ammonia-containing tail gas, and thus obtaining a tail washed liquid containing sulfuric acid and ammonium sulfate after washing the ammonia-containing tail gas with the dilute sulfuric acid, wherein the tail washed liquid is used for preparing the mixed acid.
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Description

technical field

[0001] The invention relates to the technical field of chemical production, in particular to a production method for producing large-grain ammonium sulfate by combining the slurry generated in the process of producing industrial phosphoric acid with wet-process phosphoric acid and sulfuric acid. Background technique

[0002] Ammonium sulfate is a good sulfur- and nitrogen-containing fertilizer in agriculture. Sulfur is an intermediate nutrient element needed by crops. Sulfur-containing fertilizers not only increase crop yields, but also improve crop quality. The amount used in the United States, Japan and other countries is relatively large. Big. The vast majority of ammonium sulfate on the market is crystalline ammonium sulfate with high purity, and the diameter is less than 1mm, and it is difficult to granulate single ammonium sulfate to obtain large-grained ammonium sulfate. Today, when agriculture is highly mechanized, ammonium sulfate in the form of sma...

Examples

Embodiment 1

[0022] Such as figure 1 Shown, a kind of production method of large particle ammonium sulfate, this method may further comprise the steps:

[0023] Step 1: Mix the slurry produced in the process of producing industrial phosphoric acid by wet-process phosphoric acid or the solid waste generated by press filtration in the process of producing industrial phosphoric acid in wet-process phosphoric acid with sulfuric acid and tail washing solution in a ratio of 1:10:1 to form a mixed acid;

[0024] Step 2: adding the mixed acid obtained in step 1 into ammonia gas, carrying out neutralization reaction, controlling the pH value to 3.0, and obtaining ammonium sulfate slurry;

[0025] Step 3: Send the ammonium sulfate slurry obtained in step 2 into a granulator, granulate and dry the masterbatch in the granulator, and control the temperature in the granulator to 160-180°C to obtain large-grained ammonium sulfate;

[0026] Step 4: Screen the large-grained ammonium sulfate obtained in st...

Embodiment 2

[0034] Such as figure 1 Shown, a kind of production method of large particle ammonium sulfate, this method may further comprise the steps:

[0035] Step 1: Mix the slurry generated during the production of industrial phosphoric acid by wet-process phosphoric acid with sulfuric acid and tail washing solution in a ratio of 1:10:0.6 to form a mixed acid;

[0036] Step 2: adding the mixed acid obtained in step 1 into ammonia gas, carrying out neutralization reaction, controlling the pH value to 4.0, and obtaining ammonium sulfate slurry;

[0037] Step 3: Send the ammonium sulfate slurry obtained in step 2 into a granulator, granulate and dry the masterbatch in the granulator, and control the temperature in the granulator to 180-200°C to obtain large-grained ammonium sulfate;

[0038] Step 4: Screen the large-grained ammonium sulfate obtained in step 3, and the particles with a particle diameter less than 2 mm are returned to the granulator as a masterbatch, and those with a parti...

Embodiment 3

[0046] Such as figure 1 Shown, a kind of production method of large particle ammonium sulfate, this method may further comprise the steps:

[0047] Step 1: Mix the slurry generated during the production of industrial phosphoric acid by wet-process phosphoric acid with sulfuric acid and tail washing solution in a ratio of 0.8:10:1 to form a mixed acid;

[0048] Step 2: adding the mixed acid obtained in step 1 into ammonia gas, carrying out neutralization reaction, controlling the pH value to 5.0, and obtaining ammonium sulfate slurry;

[0049] Step 3: Send the ammonium sulfate slurry obtained in step 2 into a granulator, granulate and dry the masterbatch in the granulator, and control the temperature in the granulator to 180-200°C to obtain large-grained ammonium sulfate;

[0050]Step 4: Sieve and classify the large-grained ammonium sulfate obtained in step 3. Particles with a particle size of less than 2 mm are returned to the granulator as a masterbatch, and those with a par...