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Method for producing sulfur-based composite fertilizer by using monoammonium phosphate instead of phosphoric acid

A technology of sulfur-based compound fertilizer and monoammonium phosphate, which is applied in the direction of ammonium orthophosphate fertilizer, alkaline orthophosphate fertilizer, phosphate fertilizer, etc., can solve the problems of difficult utilization of phosphogypsum, increased storage costs, and hidden dangers of environmental governance, and achieves Avoid environmental hazards, improve whiteness, and increase corporate benefits

Inactive Publication Date: 2015-03-18
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

[0002] Generally, in the production of potassium sulfate type chemical synthesis and spray granulation compound fertilizer, phosphoric acid is mainly used to provide phosphorus element in compound fertilizer, and phosphoric acid comes from the reaction between phosphate rock and sulfuric acid, and a large amount of phosphogypsum is inevitably produced in the production process , although phosphogypsum can be dried to produce phosphogypsum powder as building materials, but when the phosphorus content of phosphogypsum exceeds 1.0%, it is difficult to fully utilize the phosphogypsum, and the remaining phosphogypsum needs a larger site for storage, which not only increases storage costs, but also Potential hidden dangers to environmental governance

Method used

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  • Method for producing sulfur-based composite fertilizer by using monoammonium phosphate instead of phosphoric acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Preparation method of monoammonium phosphate slurry: dissolve monoammonium phosphate with water or compound fertilizer tail gas washing liquid, heat with low-pressure steam, control the pressure of low-pressure steam at 0.1MPa, control the temperature of monoammonium phosphate slurry at 50°C, The specific gravity of ammonium slurry is 1.30g / ml.

[0018] (2) The method of preparing mixed acid: from the circulation tank H of the sulfuric acid workshop 2 SO 4 Sulfuric acid with a mass content of 98%, the sulfuric acid enters the conversion tank after being metered by a flow meter. Potassium chloride enters the hopper through the elevator, and then enters the conversion tank after being weighed by the belt and reacts with sulfuric acid in the first zone of the conversion tank. During the reaction, low-pressure steam is added, and the pressure of the low-pressure steam is controlled at 0.1MPa. The internal reaction was controlled at 100°C.

[0019] A solution containi...

Embodiment 2

[0033] The difference between this example and Example 1 is that the low-pressure steam pressure used is controlled at 0.6MPa, the temperature of the monoammonium phosphate slurry is controlled at 80°C, the specific gravity of the monoammonium phosphate slurry is 1.40g / ml, potassium chloride, sulfuric acid , Material ratio of monoammonium phosphate slurry 1t: 1.0m 3 : 2.50m 3 ; Mixed acid specific gravity: 1.60g / ml. After the mixed acid reacts with ammonia gas, the neutralization degree of ammonia and mixed acid is 1.60.

Embodiment 3

[0035] The difference between this example and Example 1 is that the low-pressure steam pressure is controlled at 0.4MPa, the temperature of the monoammonium phosphate slurry is controlled at 70°C, the specific gravity of the monoammonium phosphate slurry is 1.34g / ml, potassium chloride, sulfuric acid, phosphoric acid Material ratio of ammonium slurry 1t: 0.855m 3 : 1.50m 3 ; Specific gravity of mixed acid: 1.50g / ml. After the mixed acid reacts with ammonia gas, the neutralization degree of ammonia and mixed acid is 1.55.

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Abstract

The invention discloses a method for producing a sulfur-based composite fertilizer by using monoammonium phosphate instead of phosphoric acid, which comprises the following steps: 1) preparing monoammonium phosphate slurry, that is, dissolving monoammonium phosphate with water or composite fertilizer tail gas washing liquid, and heating with low-pressure steam; 2) preparing mixed acid, that is, reacting sulfuric acid with potassium chloride in a conversion groove to generate a solution containing potassium hydrogen sulfate and excessive sulfuric acid, controlling the reaction in the conversion groove at 100-150 DEG C, transferring the solution into an acid mixing trough, mixing the solution with the monoammonium phosphate slurry in the acid mixing trough; 3) further performing a neutralization reaction of the mixed acid and gas ammonia in a neutralization reactor to generate neutralized slurry; 4) spraying the neutralized slurry into a pelletizer to produce the sulfur-based composite fertilizer. The concentration of the sulfuric acid is 98%. The advantages of the invention are that the composite fertilizer is produced by monoammonium phosphate, the generation of phosphogypsum is prevented, about 0.98 tons of phosphogypsum are decreased when one ton of the composite fertilizer is produced, and the environmental protection hidden trouble caused by phosphogypsum is prevented.

Description

technical field [0001] The invention relates to a method for producing compound fertilizer through potassium sulfate type chemical synthesis and spray granulation, in particular to a method for producing sulfur-based compound fertilizer by replacing phosphoric acid with monoammonium phosphate. Background technique [0002] Generally, in the production of potassium sulfate type chemical synthesis and spray granulation compound fertilizer, phosphoric acid is mainly used to provide phosphorus element in compound fertilizer, and phosphoric acid comes from the reaction between phosphate rock and sulfuric acid, and a large amount of phosphogypsum is inevitably produced in the production process , although phosphogypsum can be dried to produce phosphogypsum powder as building materials, but when the phosphorus content of phosphogypsum exceeds 1.0%, it is difficult to fully utilize the phosphogypsum, and the remaining phosphogypsum needs a larger site for storage, which not only incr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G1/00
CPCC05B7/00C05C3/00C05D1/02
Inventor 孙海兵王广辉张广信王汝申鲁振峰
Owner 山东聊城鲁西化工第五化肥有限公司
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