Ammonium sulfate as base fertilizer to deep cover soil, in order to facilitate crop absorption.
Ammonium sulfate is best used as a topdressing crop. According to different types of soil to determine the amount of ammonium sulfate topdressing. On the water and fertilizer performance of poor soil, Ammonium Sulfate to staging topdressing, each dosage should not be too much; on the water retention and fertilizer performance of the soil, each time the amount may be more appropriate.
How much soil moisture also has a greater impact on fertilizer efficiency, especially in dry land, the application of ammonium sulfate must pay attention to timely watering. As for the paddy field for topdressing, you should first drain dry, and pay attention to the combination of farming rake at the same time. In addition, there are significant differences in the application of ammonium sulfate in different crops, such as for fruit trees, Ammonium Sulfate can be ditching facilities, facilities or facilities.
Ammonium sulfate production process
First, the saturation method of ammonium sulfate production process
1. Bubble Saturation
The coke oven gas from the blower is charged into the gas preheater by the electric trap. In the preheater, the indirect gas is used to heat the gas to a temperature of 60 to 70 ° C or higher in order to allow the gas to enter the bubbling saturator to evaporate the excess water in the saturator and maintain the water balance in the saturator. Ammonium Sulfate The preheated gas enters the saturator along the saturator central gas pipe and is bubbled through the bubbling umbrella from the acid mother liquor while the ammonia in the gas is absorbed by the sulfuric acid. Gas out of the saturator into the acid removal device, to capture the entrained acid mist, was sent to the crude benzene section.
Bubble saturator gas after ammonia is generally less than 0.03g / m3. The ammonia gas obtained by the ammonia in the condensate section is directly fed into the saturator when the pyridine is not produced, and the ammonia gas is introduced into the pyridine neutralizer when the pyridine is produced. Ammonia in the neutralizer and the mother liquor in the free acid and pyridine sulfate role, the formation of ammonium sulfate, and with the neutralizer back to the saturator back to the saturator. Saturated mother liquor in the ammonium sulfate has been generated in the ammonium sulfate content is higher than its solubility, the precipitation of crystals, Ammonium Sulfate and precipitation in the bottom of the saturator. The bottom crystal is pumped to the crystallization vessel, where the crystals grow and settle in the bottom. Crystallization of the bottom of the crystallization of ammonium sulfate into the centrifuge centrifuge separation, filter out the mother liquor, and washed with hot water crystallization to reduce the surface of ammonium sulfate on the free acid and impurities. Centrifuge the separated mother liquor with the crystallization tank out of the mother liquor together with the self-flow back to the saturator. Ammonium Sulfate The ammonium sulfate crystals separated from the centrifuge were passed through a screw conveyor, fed into a boiling drier, dried with hot air and fed into an ammonia sulphate bucket and packed into a finished product by weighing.
In order to make the gas within the saturator and the mother liquor in full contact, it is necessary to make the coal bubble umbrella in the mother liquor have a certain liquid seal height, and to ensure that the saturation level inside the saturator, Ammonium Sulfate for this also has a full flow on the sink, The full flow of the overflow of the mother liquor into the liquid seal through the full flow into the full flow tank to prevent the gas escape. The lower part of the full flow tank is connected to the circulation pump and the mother liquor is continuously pumped to the injector at the bottom of the saturator. So a certain rate of injection, so the satiator within the mother liquor is constantly circulating to improve the crystallization process. Gas into the saturator of the coal tar mist, Ammonium Sulfate in the saturator with the role of sulfuric acid to produce the so-called acid tar, bubble acid coal tar floating in the mother liquid surface, and with the mother liquor into the full flow tank. The acid tar leached on the liquid level of the full tank should be removed in time or separated from the mother liquor by a separate separation device to recover the mother liquor. Saturated sulfuric acid in the saturator, sent from the sulfuric acid warehouse to the high trough, and then into the saturator, the normal production, should maintain the mother acid acidity of 4% to 6%, sulfuric acid into the amount of ammonia required; Production of coarse light pyridine, the amount of sulfuric acid to be larger, but also with the ammonia into the saturator ammonia. Saturation of the saturator after a certain period of time, Ammonium Sulfate due to the deposition of the crystal will increase its resistance, serious will cause the blocker of the saturation. So the operation must be regularly pickled and washed. When the regular large acid, replenishment, water rinse saturator and acid removal device, the formation of a large number of mother liquor with a full flow to the mother tank tank. In normal
The mother liquor is pumped back to the saturator for production. The saturator is a periodic continuous operation equipment, in order to prevent the crystal blockage, regular large acid and water, thus undermining the crystallization of the normal conditions, coupled with the crystallization of the saturator at the bottom of the residence time is short, and thus smaller crystal particles, the average diameter of 0.5 Mm.