Neutralization apparatus for nitric phosphate fertilizer production mother liquid ammonia neutralization process

A technology of nitrophosphate fertilizer and mother liquor, which is applied in the field of neutralization devices used in the production of nitrophosphate fertilizer mother liquor ammonia neutralization process, can solve the problems of large loss of ammonia escape, harsh operating environment, and material accumulation in neutralization tanks, and achieve high turbulence The degree of mobility, the reduction of emissions, and the effect of reducing viscosity

Active Publication Date: 2013-02-13
TIANJI COAL CHEM IND GROUP +1
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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

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  • Neutralization apparatus for nitric phosphate fertilizer production mother liquid ammonia neutralization process
  • Neutralization apparatus for nitric phosphate fertilizer production mother liquid ammonia neutralization process
  • Neutralization apparatus for nitric phosphate fertilizer production mother liquid ammonia neutralization process

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Embodiment Construction

[0030] The specific embodiments of the present invention will be described below in conjunction with the accompanying drawings, but the content of the present invention is not limited to the scope of the listed embodiments.

[0031] The present invention, on the basis of the existing neutralization device used for the neutralization process of mother liquid ammonia of nitrophosphate fertilizer, combines the characteristics of phosphate rock in my country, and proceeds from the essential properties of the material, further improves the neutralization device of the ammonia neutralization process of mother liquid ammonia of nitrophosphate fertilizer Improve, and aim at the deficiencies of the neutralization device of the neutralization process, select a suitable multi-point feeding point, so that the neutralization process can smoothly avoid the slurry viscous area under the operating condition of a relatively stable pH value , the pH value of the process is easy to control, it is n...

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Abstract

The invention relates to a neutralization apparatus for a nitric phosphate fertilizer production mother liquid ammonia neutralization process. The neutralization apparatus comprises a first segment neutralization device, a second segment neutralization device and a neutralization tail gas washing device, wherein the second segment neutralization device is a forced circulation tubular reactor, a flash evaporation separation chamber, a descending pipe, a circulation pump and a reaction pipe are sequentially communicated to form a reaction system having an annular closed structure, and reaction system is provided for solving phenomena of material agglomeration and scab caused by increased mother liquid ammonia neutralization slurry viscosity during the nitric phosphate fertilizer production process. According to the neutralization apparatus, the multi-point material feeding structure is arranged, and the forced circulation tubular reaction is performed, such that a viscous region of the neutralization process is avoided, the material is uniformly mixed, the slurry has good fluidity, and NH3 loss is low.

Description

technical field [0001] The invention relates to a mother liquid ammonia neutralization device for producing nitrophosphate fertilizer, in particular to a neutralization device for a nitrophosphate fertilizer 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 and equipment designed to produce 900,000 tons of nitrophosphate fertilizer per year. It adopts the patented production technology of indirect freezing decalcification and biaxial horizontal granulation . The production process and equipment mainly include: nitric acid decomposition of phosphate rock, separation of acid insoluble matter, separation of calcium nitrate crystallization, neutralization of mother liquid ammonia, concentr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05B11/16C05B11/06
Inventor 荆宏键樊彩梅冯军强王志华李双志魏安根刘金亮张凌云张小超李瑞高海生
Owner TIANJI COAL CHEM IND GROUP
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