Cooling crystallization device of potassium nitrate

Abstract

The invention provides a cooling crystallization device of potassium nitrate. The cooling crystallization device of potassium nitrate comprises a stirring device, a first stage cuboid filtering cylinder, an evaporative cylinder, a cuboid condensation cylinder, a second stage cuboid filtering cylinder, and a circulating pump; three groups of feed inlet pipes are designed to penetrate the internal side of the bottom of the stirring device, and are communicated with the lower end of a feeding cylinder; a conveying rotating shaft is welded with a spiral conveying blade; the end terminal of a feedoutlet pipe is designed to stretch to the upper end of a filtering drawer in the first stage cuboid filtering cylinder; a conveyor pipe at the output terminal of a delivery pump is designed to stretchinto the evaporative cylinder, and is connected with a plurality of groups of nozzles; the two sides of the internal part of the cuboid condensation cylinder are connected with inclined blocking plates from top to bottom successively, and the inclined blocking plates are arranged in a staggered manner; a back flow pipe at the output terminal of the circulating pump is designed to penetrated intoone end of the internal side of the top of the stirring device far away from the feeding cylinder. In applications, plant ash and nitrate mud are taken as raw materials, the cost is relatively low, sodium chloride crystals can be collected, when a mixed solution flow along the inclined blocking plates, the precipitation rate of potassium nitrate is increased, and the design of the back flow pipe is capable of realizing recycling of potassium nitrate in an obtained filtrate.

Description

technical field [0001] The invention belongs to the technical field of chemical product preparation, and more specifically relates to a cooling crystallization device for potassium nitrate. Background technique [0002] Potassium nitrate is an important inorganic chemical product. Industrial potassium nitrate is mainly used to make black gunpowder, fireworks, matches, glass products and optical glass, etc. Agricultural potassium nitrate is a high-quality compound fertilizer. For a long time, potassium nitrate The market is in short supply and is a product in short supply. Domestic production methods of potassium nitrate mainly include: sodium nitrate-potassium chloride conversion method, mixing sodium nitrate and potassium chloride, separating out sodium chloride while evaporating, and separating out sodium chloride; properly diluting the mother liquor to prevent precipitation of sodium salt, After cooling to about 5°C, the product potassium nitrate is precipitated. After t...

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Problems solved by technology

[0003] The inventor found similar patents in the process of patent retrieval. For example, the application number is: in the Chinese patent of 200920065608.7, a kind of cooling crystallization device for producing potassium nitrate is disclosed. Cooling the crystallizer, the vacuum cooling crystallizer is equipped with a vacuum pump, the vacuum pump is connected to the condenser through the pipeline, the water suction port of the water pump is connected to the water tank, and the water outlet of the water pump is connected to the condenser through the jet pump, and the vacuum cooling crystallizer includes the inner wall of the cylindrical container fixed by a bracket in the center Circulation pipe, the upper part of the central circulation pipe is connected to the nozzle, the inlet is set at the bottom of the cylindrical container, the outlet is set in the middle, the vacuum pump is connected to the steam outlet at the top, and the vacuum cooling crystallizer is used for the metathesis reaction formation and crystallization of ammonium nitrate and potassium chloride The main product potassium nitrate container solution overcomes the high price of sodium nitrate and resource constraints, the low value of the by-product sodium chloride, the use of open direct evaporation containers, the thermal efficiency is very low, and the ion exchange method requires titanium materials , titanium-molybdenum-nickel alloy or other synthetic materials, the defect of high cost is suitable for the manufacture of potassium nitrate

[0004] Based on the above, the inventors have found that the traditional potassium nitrate crystallization device adopts ammonium nitrate and potassium chloride as raw materials, the cost is high, and the utilization rate of raw materials is low. In the crystallization process of potassium nitrate, only nitric acid can be collected. Potassium is a single crystal, the amount of precipitation is small, and it is not convenient to quickly remove impurities and potassium nitrate crystals

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