Neutralization process for ammonia in a mother liquor used for producing nitric acid phosphate fertilizer

A technology for nitrophosphate fertilizer and mother liquor, which is applied in the field of ammonia neutralization technology of nitrophosphate fertilizer mother liquor, can solve the problems of harsh operating environment, large loss of ammonia escaping, and material in the neutralization tank, so as to improve the absorption efficiency, reduce the process cycle ratio, The effect of reducing viscosity

Active Publication Date: 2014-07-16
TAIYUAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main problems in the normal pressure neutralization process are that the pH value is difficult to control, prone to overammoniation, slurry viscosity, large loss of ammonia escape, more air leakage, and caking and scarring on the top of the neutralization tank Phenomenon, poor operating environment

Method used

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  • Neutralization process for ammonia in a mother liquor used for producing nitric acid phosphate fertilizer
  • Neutralization process for ammonia in a mother liquor used for producing nitric acid phosphate fertilizer
  • Neutralization process for ammonia in a mother liquor used for producing nitric acid phosphate fertilizer

Examples

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Embodiment approach 1

[0050] Implement a kind of mother liquid ammonia neutralization process of producing nitrophosphate fertilizer, wherein neutralization process flow is as figure 1 As shown, the specific process steps are as follows:

[0051] 1. A period of neutralization

[0052] Carry out the reaction of mother liquor and ammonia in a normal-pressure reaction tank, the addition of gas ammonia is 50% of the total amount of gas ammonia required for neutralization, and prepares acidic slurry with pH=1.6-2.0;

[0053] 2. Two-stage neutralization

[0054] The two-stage neutralization process is carried out in a forced circulation tubular reactor, such as figure 2 with image 3 , this process adopts a multi-point feeding method, the acid slurry from the first stage of neutralization is divided into two, 50% of the acid slurry is added from the first stage of the neutralization slurry inlet I11, and 50% of the acidic slurry is fed from the first stage of the neutralization slurry The inlet II15...

Embodiment approach 2

[0061] Implement a kind of mother liquid ammonia neutralization process of producing nitrophosphate fertilizer, its technological process is as follows figure 1 As shown, the concrete process steps are as follows:

[0062] 1. A period of neutralization

[0063] Reaction of mother liquid and ammonia gas is carried out in a normal pressure reaction tank, the amount of gas ammonia added is 50% of the total amount of gas ammonia required for neutralization, and acid slurry with pH=1.6-2.0 is prepared.

[0064] 2. Two-stage neutralization

[0065] The two-stage neutralization process is carried out in a forced circulation tubular reactor, such as figure 2 with image 3 , this process adopts a multi-point feeding method, the acid slurry from the first stage of neutralization is divided into two, 50% of the acid slurry is added from the first stage of the neutralization slurry inlet I11, and 50% of the acidic slurry is fed from the first stage of the neutralization slurry The in...

Embodiment approach 3

[0072] Implement a kind of mother liquid ammonia neutralization process of producing nitrophosphate fertilizer, its technological process is as follows figure 1 As mentioned, the specific steps are as follows:

[0073] 1. A period of neutralization

[0074] Reaction of mother liquid and ammonia gas is carried out in a normal pressure reaction tank, the amount of gas ammonia added is 50% of the total amount of gas ammonia required for neutralization, and acid slurry with pH=1.6-2.0 is prepared.

[0075] 2. Two-stage neutralization

[0076] The second-stage neutralization device is carried out in a forced circulation tubular reactor, such as figure 2 with image 3 , this process adopts a multi-point feeding method, the acid slurry from the first stage of neutralization is divided into two, 50% of the acidic slurry is added from the first stage of the neutralization slurry inlet I11, and 50% of the acidic slurry is fed from the first stage of the neutralization slurry Slurry...

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Abstract

Neutralization process for ammonia in a mother liquor used for producing nitric acid phosphate fertilizer is that the neutralization reaction is carried out on the phosphoric acid mother liquor from a calcium nitrate filtering operation and gaseous ammonia under normal pressure in a first section neutralization apparatus to prepare an acidic slurry with a pH value of 1.6-2.0; sending the acidic slurry to a second section forced circulation apparatus to continue the ammoniation neutralization reaction until the pH value of the outlet slurry is 5.6-6.0, and the water content is 10-15%; sending ammonia-containing gas escaping from the second section neutralization apparatus to the first section neutralization apparatus to carry out absorption and purifying; carrying out neutralization and tail gas washing on the tail gas escaping from the first section neutralization apparatus; discharging the the tail gas after being washed and absorbed; and sending the washing liquid to the second section neutralization apparatus. The specific thickness region generated in the phosphoric acid mother liquor neutralization process is avoided by the technology provided in the invention, and material is uniformly mixed, fluidity of slurry is good and loss of NH3 is small.

Description

technical field [0001] The invention relates to a mother liquid ammonia neutralization process for producing nitrophosphate fertilizer, in particular to a mother liquid ammonia neutralization process for producing nitrophosphate fertilizer by freezing nitric acid and phosphate rock as raw materials. Background technique [0002] The nitrophosphate fertilizer plant of China Tianji Coal Chemical Group Co., Ltd. was introduced from Norway in the 1980s. It is a modern large-scale production process with an annual output of 900,000 tons of nitrophosphate fertilizer. It adopts the patented production technology of indirect freezing decalcification and biaxial horizontal granulation. The production process mainly includes: nitric acid decomposition of phosphate rock, separation of acid insoluble matter, separation of calcium nitrate crystallization, neutralization of mother liquid ammonia, concentration of NP slurry, granulation, drying, screening, packaging, and conversion of calci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G1/00
Inventor 樊彩梅李双志荆宏键王志华冯军强魏安根刘金亮张凌云张小超高海生李瑞李垚
Owner TAIYUAN UNIV OF TECH
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