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A method for strengthening the separation of by-product ammonium chloride in the production of potassium nitrate by metathesis

A double decomposition method and potassium nitrate technology, applied in the field of strengthening the separation of by-product ammonium chloride, can solve the problems of poor separation effect and high labor intensity, and achieve the effects of reducing losses, reducing labor intensity, and low energy consumption

Inactive Publication Date: 2017-07-11
XIANGTAN UNIV
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AI Technical Summary

Problems solved by technology

Based on the current ammonium nitrate-potassium chloride double decomposition cycle process technology and the existing by-product ammonium chloride separation method, through the practice of small laboratory tests and industrial scale production, the invention provides a method for the production of potassium nitrate by double decomposition The method of strengthening the separation of by-product ammonium chloride, this invention provides a substantial solution to a series of problems such as poor separation effect and high labor intensity in the separation process of by-product ammonium chloride in the production of potassium nitrate by double decomposition cycle method in my country

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1)KNO 3Reaction solution preparation: mix raw materials potassium chloride and ammonium nitrate with water or circulating mother liquor according to a certain ratio to make KNO 3 Reaction solution, control NH 4 + with Cl - The molar ratio is 1.05:1, and the reaction solution is heated to about 100°C;

[0026] (2) Flotation agent: according to the input amount weight 100% of potassium chloride in the step (1), add the C of weight ratio 0.02% in the reaction system 18 straight-chain fatty amines;

[0027] (3) adjust the pH value: take hydrochloric acid as the regulator, adjust the pH value of the system=4.0;

[0028] (4) Ammonium chloride flotation separation: After the potassium nitrate reaction solution evaporates to 42Be, cool to 30°C, and stir it at a uniform speed of 150r / min after the crystallization is complete. KNO 3 The crystallization system is divided into three layers, which are from bottom to top: crude potassium nitrate crystal solid layer, mother li...

Embodiment 2

[0032] (1)KNO 3 Reaction solution preparation: mix raw materials potassium chloride and ammonium nitrate with water or circulating mother liquor according to a certain ratio to make KNO 3 Reaction solution, control NH 4 + with Cl - The molar ratio is 1.1:1, and the reaction solution is heated to about 100°C;

[0033] (2) Flotation agent: according to the input amount weight 100% of potassium chloride in the step (1), add the C of total weight ratio 0.03% in the reaction system 12 、C 16 、C 18 straight-chain fatty amines. Among them, C 12 、C 16 、C 18 The weight of each is one-third of the total weight of the three;

[0034] (3) adjust the pH value: with potassium hydroxide as the regulator, adjust the pH value of the system=6.0;

[0035] (4) Ammonium chloride flotation separation: After the potassium nitrate reaction solution is evaporated to 42Be, it is cooled to 30°C. After complete crystallization, the solid and liquid mixture are pumped to the filter device togeth...

Embodiment 3

[0039] (1)KNO 3 Reaction solution preparation: mix raw materials potassium chloride and ammonium nitrate with water or circulating mother liquor according to a certain ratio to make KNO 3 Reaction solution, control NH 4 + with Cl - The molar ratio is 1.2:1, and the reaction solution is heated to about 100°C;

[0040] (2) Flotation agent: according to the input amount weight 100% of potassium chloride in the step (1), add the C of total weight ratio 0.04% in the reaction system 16 、C 20 straight-chain fatty amines. Among them, C 16 、C 20 The weight of each is 50% of its total weight;

[0041] (3) adjust the pH value: take sodium hydroxide as the regulator, adjust the pH value of the system=8.0;

[0042] (4) Ammonium chloride flotation separation: After the potassium nitrate reaction solution is evaporated to 42Be, it is cooled to 30°C. After complete crystallization, the solid and liquid mixture are pumped to the filter device together, and the ammonium chloride will b...

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Abstract

The invention discloses a method for strengtheningly separating byproduct ammonium chloride from potassium nitrate produced through a complex decomposition method. According to the method, on the basis of a technology for producing the potassium nitrate through a traditional complex decomposition method, agents such as higher straight-chain fatty amine with the number of C ranging from 12 to 20 for flotation is added in a reaction system, and under the condition of a certain pH value, after reaction and crystallization are conducted, under the stirring action or the pumping action of a pump, effective separation of the byproduct ammonium chloride and the potassium nitrate is completed through the mode of carrying the ammonium chloride through foam. Compared with the technologies such as washing and heat dissolving in traditional production, the method has the advantages of being easy and convenient to operate, small in agent dosage, good in separation effect and the like. On one hand, the grade of crude potassium nitrate is promoted, and the content of impurities such as NH4<+> and Cl<-> is significantly decreased; on the other hand, the effects of saving energy and reducing consumption are significant, and the consumption of water in the washing process is reduced. The method is applied to large-scale continuous production of the potassium nitrate through the potassium chloride and ammonium nitrate complex decomposition method, and the economic benefits and the social benefits are obvious.

Description

technical field [0001] The invention relates to a method for strengthening the separation of by-product ammonium chloride in the production of potassium nitrate by the metathesis method of potassium chloride and ammonium nitrate. Background technique [0002] Potassium nitrate is colorless transparent crystal or white powder. It is not only an important inorganic chemical raw material but also a high-quality chlorine-free nitrogen-potassium binary compound fertilizer. Industrial potassium nitrate is mainly used in gunpowder, metal welding aids, ammonia catalysts, and also in optical glass, ceramics, computers, mobile phones and color TV glass shells and other industries; agricultural grade potassium nitrate is mainly used as "third-generation potassium fertilizer" for tobacco, Flowers, citrus and other economic crops sensitive to chloride ions to improve the yield and quality of agricultural products. [0003] At present, domestic potassium nitrate production methods mainly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D9/10C01C1/16
CPCY02P20/10
Inventor 夏珺段正康闫建华章泽成左新盛
Owner XIANGTAN UNIV
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