Method for producing compound fertilizer from monoammonium phosphate hydrolysate

A monoammonium phosphate and hydrolyzate technology, which is applied to ammonium orthophosphate fertilizers, alkaline orthophosphate fertilizers, phosphate fertilizers, etc. It can solve the problems of easy pulverization and hardening of finished particles, low one-time pelleting rate, and large steam usage, etc. problems, to achieve the effect of reducing the risk of hardening, improving the efficiency of pre-dissolving, and improving the rate of ball formation

Inactive Publication Date: 2017-05-17
郑州阿波罗肥业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. The one-time ball forming rate is not high, and a large amount of Mingguang soil or other additives need to be added, and the cost is high;
[0004] 2. A large amount of steam is used during granulation;
[0006] 4. The finished product contains free acid, and the finished product particles are easy to pulverize and harden.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Step 1. The monoammonium phosphate enters the phosphoric acid water-dissolving tank through the elevator, and at the same time, the water is pumped into the water-dissolving tank. Under the heating of the coil, the water is heated to 80°C, and the monoammonium phosphate is fully dissolved under the action of stirring. Obtain monoammonium phosphate hydrolyzate solution, its hydrolysis reaction formula is: NH 4 h 2 PO 4 =NH 4 + +H 2 PO 4 - , the monoammonium phosphate hydrolyzate solution is acidic;

[0023] Step 2, add ammonium chloride, monoammonium phosphate, potassium chloride solution, ammonium bicarbonate, urea in the granulator, wherein the concentration of potassium chloride solution is 95%, the weight percentage of ammonium chloride is 39%, phosphoric acid The weight percentage of monoammonium is 42%, the weight percentage of potassium chloride solution is 8%, the weight percentage of ammonium bicarbonate is 8%, the weight percentage of urea is 3%, gets m...

Embodiment 2

[0025] Step 1. The monoammonium phosphate enters the phosphoric acid water-dissolving tank through the elevator, and at the same time, the water is pumped into the water-dissolving tank. Under the heating of the coil, the water is heated to 100°C, and the monoammonium phosphate is fully dissolved under the action of stirring. Obtain monoammonium phosphate hydrolyzate solution, its hydrolysis reaction formula is: NH 4 h 2 PO 4 =NH 4 + +H 2 PO 4 - , the monoammonium phosphate hydrolyzate solution is acidic;

[0026] Step 2, add ammonium chloride, monoammonium phosphate, potassium chloride solution, ammonium bicarbonate, urea in the granulator, wherein the concentration of potassium chloride solution is 95%, the weight percentage of ammonium chloride is 39%, phosphoric acid The weight percentage of monoammonium is 42%, the weight percentage of potassium chloride solution is 8%, the weight percentage of ammonium bicarbonate is 8%, the weight percentage of urea is 3%, gets ...

Embodiment 3

[0028] Step 1. The monoammonium phosphate enters the phosphoric acid water-dissolving tank through the elevator, and at the same time, the water is pumped into the water-dissolving tank. Under the heating of the coil, the water is heated to 90°C, and the monoammonium phosphate is fully dissolved under the action of stirring. Obtain monoammonium phosphate hydrolyzate solution, its hydrolysis reaction formula is: NH 4 h 2 PO 4 =NH 4 + +H 2 PO 4 - , the monoammonium phosphate hydrolyzate solution is acidic;

[0029] Step 2, add ammonium chloride, monoammonium phosphate, potassium chloride solution, ammonium bicarbonate, urea in the granulator, wherein the concentration of potassium chloride solution is 95%, the weight percentage of ammonium chloride is 39%, phosphoric acid The weight percentage of monoammonium is 42%, the weight percentage of potassium chloride solution is 8%, the weight percentage of ammonium bicarbonate is 8%, the weight percentage of urea is 3%, gets m...

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PUM

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Abstract

The invention discloses a method for producing compound fertilizer from monoammonium phosphate hydrolysate. The method comprises the steps as follows: monoammonium phosphate is hydrolyzed, and a monoammonium phosphate hydrolysate solution is obtained; ammonium chloride, monoammonium phosphate, a potassium chloride solution, ammonium bicarbonate and urea are added to a granulator, the monoammonium phosphate hydrolysate solution is taken to be introduced into the granulator through a tubular reactor, ammonia gas obtained through gasification of liquid ammonia is also introduced into the granulator through the tubular reactor, all the materials react in the granulator to produce a higher-temperature liquid-phase solid solution slurry, the slurry is subjected to rolling agglomeration granulation by maintaining the temperature inside the granulator to be 60-80 DEG C and pH to be 5.5-6.5, and compound fertilizer is obtained. Compared with the prior art, the method has the beneficial effects that the aqueous solution of monoammonium phosphate can improve the pre-dissolving efficiency of the solid material, improve the viscosity of the material and the granule surface smoothness and increase the granulation rate.

Description

technical field [0001] The invention relates to the technical field of compound fertilizer production, in particular to a method for making compound fertilizer with monoammonium phosphate hydrolyzate. Background technique [0002] At present, in the production of compound fertilizers, sulfuric acid, ammonia and steam are usually used to react in a tubular reactor and then sent to the granulator to react with other materials in the granulator. However, when granulating with sulfuric acid, there are The following disadvantages: [0003] 1. The one-time ball forming rate is not high, and a large amount of Mingguang soil or other additives need to be added, and the cost is high; [0004] 2. A large amount of steam is used during granulation; [0005] 3. The granulation temperature is not high, and secondary drying is required to effectively control moisture; [0006] 4. The finished product contains free acid, and the finished product particles are prone to pulverization and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G1/00
CPCC05B7/00C05C3/00C05G5/12
Inventor 靳宗涛顾新宇朱洪波杨建平孙中兴孙广华王鹏赵洪智张亚辉
Owner 郑州阿波罗肥业有限公司
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