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Potassium nitrate crystallization system and process through double-decomposition method

A metathesis method and potassium nitrate technology, which is applied in the field of metathesis potassium nitrate crystallization system and crystallization process, to achieve the effects of stable vacuum control, reduced emissions, and improved stability

Active Publication Date: 2015-01-07
KINGENTA ECOLOGICAL ENG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent also uses a vacuum pump (still a steam jet pump) to connect the crystallizer to form negative pressure to cool down and crystallize, but it adds a condenser after the vacuum pump, which has a certain improvement compared with the patent CN200510094223.X, but still does not change the problem of crystallization stability.

Method used

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  • Potassium nitrate crystallization system and process through double-decomposition method
  • Potassium nitrate crystallization system and process through double-decomposition method

Examples

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Embodiment 1

[0035] A double decomposition potassium nitrate crystallization system, the system includes a dissolution tank, a potassium nitrate vacuum crystallization device, a thickener, a first centrifuge, a mixing tank, a concentration device, a potassium chloride crystallization device and a second centrifuge, the The dissolving tank is provided with a first feed port and a second feed port, and the first centrifuge and the second centrifuge are provided with a first discharge port and a second discharge port, and the mixing tank A first feed port and a second feed port are provided;

[0036]The discharge port of described dissolving tank is connected with the feed port of potassium nitrate vacuum crystallization device, and the discharge port of described potassium nitrate vacuum crystallization device is connected with the feed port of thickener, and the feed port of described thickener The discharge port is connected with the feed port of the first centrifuge, the first discharge p...

Embodiment 2

[0040] A kind of crystallization technique of potassium nitrate utilizing the device double decomposition method described in embodiment 1, the steps are as follows:

[0041] Add circulating mother liquor, water and potassium chloride to the dissolving tank, the circulating mother liquor is ammonium chloride mother liquor, control the molar ratio of the added ammonium ions and chloride ions at 1:1, heat the dissolving tank with steam to 75°C and Stir to dissolve the material completely; the feed liquid enters the potassium nitrate vacuum crystallization device, the thickener and the first centrifuge in turn, and the water content of the thickener output is controlled at 45%;

[0042] The wet phase potassium nitrate crystals are separated from the second outlet of the first centrifuge, and the wet phase potassium nitrate crystals are dried and cooled to obtain the finished product of potassium nitrate; the potassium nitrate crystallization mother liquor is added to the mixing ma...

Embodiment 3

[0048] The metathesis potassium nitrate crystallization process as described in Example 2, the difference is: the ratio of ammonium ions to chloride ions is 1:1.1, the steam in the dissolution tank is heated to 80°C; the water content of the thickener discharge is controlled at 45 %; the mass fraction of the ammonium nitrate solution is 85%, and the quality of the ammonium nitrate solution and the quality ratio of the centrifuged mother liquor of potassium nitrate are 8:1; Ammonium crystallization temperature is controlled at 50°C.

[0049] By controlling the pressure of the vacuum system at all levels, the temperature in the primary crystallizer A1 is controlled to be 75°C, the temperature in the secondary crystallizer A2 is 60°C, the temperature in the third stage crystallizer A3 is 45°C, and the temperature in the fourth stage crystallizer A4 is 38°C, the temperature in the fifth-stage crystallizer A5 is 30°C, and the temperature in the sixth-stage crystallizer A6 is 20°C. ...

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Abstract

The invention relates to a potassium nitrate crystallization system and process through a double-decomposition method. The potassium nitrate crystallization system comprises a dissolving tank, a potassium nitrate vacuum crystallization device, a thickener, a first centrifuge, a mixing tank, a concentration device, a potassium chloride crystallization device and a second centrifuge. The potassium nitrate crystallization process comprises the following steps: adding circulating mother liquid, water and potassium chloride into the dissolving tank, sequentially feeding material liquid into the potassium nitrate vacuum crystallization device, the thickener and the first centrifuge, separating potassium nitrate crystals from the first centrifuge, drying and cooling, thereby obtaining the finished product potassium nitrate; adding potassium nitrate crystal mother liquid into the mixing tank, adding ammonium nitrate, uniformly mixing, and sequentially feeding the mixture into the concentration device, the ammonium chloride crystallization device and the second centrifuge; separating ammonium chloride crystals from the second centrifuge, drying and cooling, thereby obtaining the finished product ammonium chloride. A set of novel potassium nitrate crystallization system and process through the double-decomposition method are disclosed by the invention, the stability of potassium nitrate crystallization is improved, and the production quality and the yield are effectively ensured.

Description

technical field [0001] The invention relates to a double decomposition potassium nitrate crystallization system and a crystallization process, belonging to the technical field of chemical production. Background technique [0002] Domestic double decomposition method to produce potassium nitrate mainly adopts sodium nitrate-potassium chloride method and ammonium nitrate-potassium chloride method. The raw material price of the former is higher, and the economic value of the by-product sodium chloride is lower. The ammonium nitrate-potassium chloride double decomposition process is widely used, and the four-step circulation method is the main method: add water and potassium chloride to the circulating mother liquor, and when the temperature drops, potassium nitrate crystallizes out. Add ammonium nitrate to the mother liquor, and then evaporate and concentrate, then cool and crystallize to precipitate ammonium chloride crystals. The separated mother liquor is returned as circu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D9/08
CPCC01C1/164C01D9/10
Inventor 张敏张西兴谭永新杨明
Owner KINGENTA ECOLOGICAL ENG GRP
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