Method for preparing potassium nitrate by means of double decomposition

A metathesis method and potassium nitrate technology, which is applied in the field of potassium nitrate production by the metathesis method, can solve the problems of failing to meet the quality standard requirements of high-quality potassium nitrate, the product failing to meet the quality standard requirements, and no recombination reaction. The effect of high content, reducing process make-up water, and reducing production costs

Active Publication Date: 2010-03-03
江西金利达钾业有限责任公司
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Problems solved by technology

[0002] Potassium nitrate is colorless transparent orthorhombic crystal or rhombohedral crystal or white powder, odorless, non-toxic, and salty. It is an important raw material for inorganic chemical industry and is widely used in industry, agriculture, medicine, food, etc. The method of potassium nitrate etc. such as Chinese patent number is that the patent number is 01114497.1 " the method for producing potassium nitrate by double decomposition three-step circulation method ", also need to add sodium nitrate as auxiliary agent in its production process, an

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  • Method for preparing potassium nitrate by means of double decomposition
  • Method for preparing potassium nitrate by means of double decomposition

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Embodiment 1

[0034] (1) When batching for the first time, add appropriate amount of water, potassium chloride and ammonium nitrate to the reaction vessel, heat up to the temperature of the solution to 85-95°C, and control the concentration of Cl in the solution. - The concentration is 14~19% and NH 4 + The concentration is 6~6.9%; (2) KNO 3 Semi-finished product crystallization: When the reaction solution meets the above concentration requirements, it is placed in a cooling crystallizer to cool down to 0-25°C, so that the semi-finished product KNO 3 Crystallization; (3) cooling and crystallization solution filtration, filtrate (mother liquor I) is discharged to liquid storage tank, KNO 3 Crystallization is washed with water to make the solid KNO 3 Cl in - The mass fraction is 1-2%; NH 4 + The mass fraction is 1 to 3%, and the flushing liquid is discharged to the liquid storage tank; (4) semi-finished KNO 3 Crystal recombination in a metathesis setup: the KNO 3 Put the crystal into ...

Embodiment 2

[0035] The production method of embodiment 2 and embodiment 1 and process parameter and metathesis device are basically the same, and difference is stated as follows, (1) drop into reaction material in reaction vessel and react, control the Cl in the solution - The concentration is 14~15.8%, NH 4 + The concentration is 6-8%, and the temperature of the reaction solution is 95°C; (2) KNO 3 Cl in semi-finished crystal - The mass fraction is 1~1.5%, NH 4 + Mass fraction 1~1.5%; (3) KNO 3 When the crystal rejoins, control the concentration of the solution to 44-46Be; cool the crystallizer to 5-28°C to make KNO 3 The product crystallizes out; (4) NH 4 The Cl preparation solution is concentrated to a concentration of 33-37Be, and the KNO produced by the above process steps 3 The products have been sampled and tested by the national authoritative organization, and can meet or exceed the quality requirements of the national high-quality products.

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Abstract

The invention discloses a method for preparing potassium nitrate by means of double decomposition. The method comprises the following steps: taking potassium chloride, ammonium nitrate and water solution as raw materials, and controlling the concentrations of Cl<-> and NH4<+> in the reaction solution to be 14-19% and 6-9.6% respectively, wherein the temperature of the reaction solution is 85-95 DEG C; lowering the temperature of a solution obtained from the reaction till a temperature of 0-20 DEG C is realized, crystallizing and precipitating KNO3 semi-finished product, and obtaining a filtrate mother liquor I by means of filtration; flushing KNO3 crystals with water till the Cl<-> concentration is 1-2% and the NH4<+> concentration is 1-3%; and recovering the flushing solution; positioningthe KNO3 crystals in a double decomposition device so that the KNO3 crystals can be fully dissolved, and controlling the solution concentration to be 44-52 Be; lowering the temperature for purpose ofprecipitating the KNO3 crystal, drying the KNO3 crystal till the water content of the KNO3 is less than or equal to 0.1%, and then obtaining the KNO3 finished product. In the method, the double decomposition device is used during the double decomposition reaction process and no stirring device is needed, therefore, the contact reaction of the reaction solution is more complete, and balance, continuous cyclic industrial production, productivity improvement and production cost reduction are realized in the precondition of ensuring 'two highs'.

Description

Technical field: [0001] The invention relates to a method for preparing potassium nitrate, in particular to a method for producing potassium nitrate by double decomposition. Background technique: [0002] Potassium nitrate is colorless transparent orthorhombic crystal or rhombohedral crystal or white powder, odorless, non-toxic, and salty. It is an important raw material for inorganic chemical industry and is widely used in industry, agriculture, medicine, food, etc. The method of potassium nitrate etc. such as Chinese patent number is that the patent number is 01114497.1 " the method for producing potassium nitrate by double decomposition three-step circulation method ", also need to add sodium nitrate as auxiliary agent in its production process, and the potassium nitrate product produced is only suitable for agricultural nitric acid Potassium is used, and its production does not use a metathesis reaction device through the complex reaction process, so the products produce...

Claims

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Application Information

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IPC IPC(8): C01D9/10C01C1/16
Inventor 赵家春
Owner 江西金利达钾业有限责任公司
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