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Preparation method of large-particle ammonium sulfate

An ammonium sulfate and large particle technology, applied in chemical instruments and methods, ammonium salt fertilizers, nitrogen fertilizers, etc., can solve the problems of high energy consumption, large mechanical energy, difficult mechanized fertilization and preparation of blended fertilizers, etc. The effect of short reaction time and full utilization of reaction heat

Inactive Publication Date: 2013-01-16
河北天人化工股份有限公司
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

The production process of this method is: adding powdered ammonium sulfate to a dry roller press granulator and extruding it into granules by physical methods. Due to the special crystal form of ammonium sulfate powder, the mechanical energy required for granulation is very large, and the energy consumption is very high. , and the shape of the product is flake, it is difficult to meet the needs of mechanized fertilization and preparation of blended fertilizer (BB fertilizer)

Method used

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  • Preparation method of large-particle ammonium sulfate
  • Preparation method of large-particle ammonium sulfate

Examples

Experimental program
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Effect test

Embodiment 1

[0047] The total formula is sulfuric acid 1.41m 3 / h, liquid ammonia 0.848t / h, phosphoric acid 0.1m 3 / h, powdered ammonium sulfate 4t / h, magnesium powder 0.09t / h, granulation binder 0.065t / h, return material 30t / h.

[0048] As shown in Figure 1, it is a schematic process flow diagram of the present invention. The concentration is 46% (P 2 o 5 Content) of phosphoric acid is pressurized to 1MPa by a phosphoric acid pump, measured and controlled by a flow meter and a regulating valve at a rate of 0.1m 3 / h into the cyclone scrubber. Sulfuric acid with a concentration of 95% is pressurized to 1MPa by a sulfuric acid pump, and is metered and controlled by a flow meter and a regulating valve respectively at a rate of 1.25m 3 / h and 0.16m 3 / h into the tubular reactor and the cyclone scrubber respectively. Liquid ammonia (concentration 99.5%) enters the tubular reactor and the ammonia injection shaft at 0.773t / h and 0.075t / h after being metered and controlled by the flow mete...

Embodiment 2

[0054] The total formula is sulfuric acid 1.24m 3 / h, liquid ammonia 0.744t / h, phosphoric acid 0.15m 3 / h, powdery ammonium sulfate 4.5t / h, powdery Peng Run soil 0.2t / h, mixture type (40 parts by weight of modified starch, 20 parts by weight of sodium lignosulfonate, 30 parts by weight of urea-formaldehyde resin, 10 parts by weight of cellulose ) granulation binder 0.04t / h, return material 20t / h. Other is identical with embodiment 1, and same kind raw material specification is with embodiment 1, and difference is not to add magnesium powder in the granulator, adds filler bentonite. Sulfuric acid concentration 95%, tubular reactor sulfuric acid 1.08m 3 / h, liquid ammonia (concentration 99.5%) enters the tubular reactor and the ammonia injection shaft at 0.707t / h and 0.037t / h after being metered and controlled by the flow meter and the regulating valve respectively, and the sulfuric acid of the cyclone washing tower is 0.16m 3 / h, gas-liquid separator 51% phosphoric acid (P ...

Embodiment 3

[0056] The total formula is sulfuric acid 2.35m 3 / h, liquid ammonia 1.41t / h, powdery ammonium sulfate 5t / h, powdery kaolin 0.11t / h, mixture type (10 parts by weight of modified starch, 5 parts by weight of sodium lignosulfonate, 80 parts by weight of urea-formaldehyde resin , 5 parts by weight of cellulose) granulation binder 0.06t / h, return material 25t / h.

[0057] Others are the same as in Example 1, and the specifications of the same kind of raw materials are the same as in Example 1, except that magnesium powder is not added in the granulator, and filler kaolin is added. Sulfuric acid concentration 93%, tubular reactor sulfuric acid 2.15m 3 / h, gas ammonia 1.0t / h. Ammonia injection shaft of granulator 0.41t / h, cyclone scrubber sulfuric acid 0.2m 3 / h, powdered ammonium sulfate 5t / h, kaolin 0.25t / h, granulation binder 0.06t / h, return material 25t / h, granulation temperature 90~100℃, drying hot air temperature 110~150℃, The drying tail gas temperature is 75-90°C, the wat...

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Abstract

The invention relates to a preparation method of large-particle nitrogenous fertilizers, in particular to a preparation method of large-particle ammonium sulfate, which comprises the following steps: firstly, adding 25-60 parts by weight of sulfuric acid, 7.6-16.5 parts by weight of ammonia and washing liquid from a gas-liquid separator to a tubular reactor for neutralization reaction; spraying high-temperature slurry formed after the reaction into a pelletizer; wherein, simultaneously, a solid material bed which comprises 20-70 parts by weight of solid material and rolls together with returns in the pelletizer can be installed in the pelletizer; spraying a pelleting binder through a spray nozzle and spraying the ammonium through an ammonium spraying shaft for pelleting to form wet solid material; fractionating the dried material after entering a sieving machine to sieve qualified particles and then cooling the particles to obtain the product. The invention reduces the reaction load of the tubular reactor; the system returns ratio is reduced, and the water balance is easier to control; simultaneously, the production cost is reduced, and recycling and the high-value utilization of industrial byproducts are realized by utilizing by-product powdery ammonium sulfate.

Description

technical field [0001] The invention relates to a preparation method of large particle nitrogen fertilizer, in particular to a preparation method of large particle ammonium sulfate. Background technique [0002] At present, the technologies for preparing large particle ammonium sulfate are: [0003] 1. "Concentration and crystallization production process of by-product ammonium sulfate solution": it can be produced by using ammonium sulfate solution, a by-product of lactam preparation. In the production process, the ammonium sulfate solution, a by-product of the preparation of lactam, is input into the crystallization tank to concentrate the crystallization, and the ammonium sulfate crystals are recovered from the slurry containing crystallization ammonium sulfate through a separation device. This process needs to keep the crystallization tank The number of ammonium sulfate crystals is repeatedly increased / decreased within the range between the upper limit and the lower lim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01C1/242C05C3/00
Inventor 王宝安曹涛聂景新马杰文刘峰
Owner 河北天人化工股份有限公司
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