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Production method for potassium sulfate compound fertilizer

A production method and potassium sulfate type technology, which are applied in fertilization devices, fertilizer mixtures, applications, etc., can solve the problems of unstable production, affecting product quality, and difficulty in adjusting the consistency of neutralization slurry. Improve resource utilization and reduce resource loss

Active Publication Date: 2012-07-04
山东聊城鲁西化工第五化肥有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the existing technology, high-concentration ammonia water is used instead of ammonia reaction or high-concentration ammonia water and ammonia gas are used simultaneously for neutralization. This technology is not easy to adjust the consistency of neutralizing slurry, resulting in unstable production and affecting product quality.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A kind of production method of potassium sulfate type compound fertilizer, comprises the following steps:

[0022] (1) Preparation of mixed acid

[0023] From the circulation tank H of the sulfuric acid workshop 2 SO 4 Sulfuric acid with a mass concentration of 98%, the temperature is controlled between 75°C and 90°C, the sulfuric acid pump measures the sulfuric acid through the flow meter and sends it to the plate heater, and then enters the conversion tank after steam heating meets the requirements.

[0024] Potassium chloride enters the hopper through the elevator, enters the conversion tank through the disc feeder, screw scale and screw conveyor, and reacts with the heated sulfuric acid in the first zone of the conversion tank.

[0025] KCL and H 2 SO 4 Potassium bisulfate and hydrogen chloride gas are generated under heating conditions, and the reaction equation is as follows:

[0026] KCL+H 2 SO 4 =KHSO 4 +HCL↑

[0027] The HCL generated by the reaction i...

Embodiment 2

[0047] The difference between the present embodiment and embodiment 1 is: the specific gravity of phosphoric acid is 1.23g / ml, and the material ratio of potassium chloride, sulfuric acid and phosphoric acid is 1t: 0.9m 3 : 3.5m 3 The mass concentration of ammonia in ammonia water is 12%, and the proportion of the original mixed acid after adding ammonia water is 1.4g / ml. After the mixed acid reacts with ammonia gas, the neutralization degree of ammonia and phosphoric acid is 1.15.

Embodiment 3

[0049] The difference between this embodiment and embodiment 1 is: the specific gravity of phosphoric acid is 1.27g / ml, and the material ratio of potassium chloride, sulfuric acid, phosphoric acid is 1t: 1.3m 3 : 4m 3 The mass concentration of ammonia in ammonia water is 18%, and the proportion of the original mixed acid after adding ammonia water is 1.44g / ml. After the mixed acid reacts with ammonia gas, the neutralization degree of ammonia and phosphoric acid is 1.24.

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Abstract

The invention relates to a production method for a potassium sulfate compound fertilizer, which comprises the steps of: performing neutralization reaction on 10 to 10 mass percent ammonia water first, ammonia then and phosphorus-containing mixed acid until the neutralization degree of the ammonia and phosphoric acid in the mixed acid is between 1.10 and 1.30; and then performing granulation. In the production method, the density of the neutralized slurry is easy to adjust, the appearance quality of the compound fertilizer is improved, and simultaneously, the production method has the advantage of simple process operation and great reduction of the cost.

Description

technical field [0001] The invention relates to a production method of compound fertilizer, belonging to the technical field of fertilizer production. Background technique [0002] The well-known traditional production method of chemical synthesis spray granulation compound fertilizer is to use mixed acid and pure gas ammonia to react in a neutralization tank or a tubular reactor to form a slurry to further produce compound fertilizers. It is convenient for transportation and storage. It is transported and stored in a liquid state. When liquid ammonia is converted into gaseous ammonia and reacts with mixed acid, it needs to absorb a large amount of steam. Ammonia water is not only convenient for transportation and storage in liquid ammonia, but also mostly produced in some chemical enterprises. The by-products are cheap and easy to obtain. [0003] In the existing technology, high-concentration ammonia water is used instead of ammonia reaction or high-concentration ammonia ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G1/06
Inventor 焦延涛吕新春王汝申许留保张广信
Owner 山东聊城鲁西化工第五化肥有限公司
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