Silver nitrate continuous evaporative crystallization device

Abstract

A silver nitrate continuous evaporative crystallization device comprises an evaporation kettle, a freezing crystallizer, a centrifugal filtration scrubber and a filtrate collecting tank, a filtrate feeding port in the top of the evaporation kettle is connected with a filtrate circulating pipeline, and the bottom of the evaporation kettle is connected with a feeding port II of the freezing crystallizer through a valve I, a feeding pipeline I and a liquid pump I in sequence; a discharging port II at the bottom of the freezing crystallizer is connected with the centrifugal filtering washer through a valve II and a feeding pipeline II, a filtrate discharging port of the centrifugal filtering washer is connected with a filtrate inlet of the filtrate collecting tank through a valve III, and the filtrate collecting tank sequentially passes through a filtrate circulating pipeline, a valve IV and a liquid pumping pump II. The filter is connected with a filtrate circulating pipeline. The device can be used for continuously evaporating and crystallizing silver nitrate, so that the centrifugal mother liquor and the washing filtrate can be recycled, the evaporating and crystallizing efficiency is improved, and the silver nitrate production efficiency is obviously improved.

Description

Technical Field

[0001] The utility model relates to the field of silver nitrate production technology, in particular to a silver nitrate continuous evaporation and crystallization device. Background Art

[0002] Colorless, transparent, orthorhombic flaky crystals, easily soluble in water and ammonia, soluble in ether and glycerol, slightly soluble in anhydrous ethanol, and almost insoluble in concentrated nitric acid. Its aqueous solution is weakly acidic. Silver nitrate solution contains a large amount of silver ions, so it has strong oxidizing properties and is corrosive to a certain extent. It is used in medicine to corrode hyperplastic granulation tissue, and dilute solutions are used as bactericides for eye infections. It is a light yellow liquid after melting and remains white after solidification. Silver nitrate is mainly used in industries such as silver-plated products for electronic devices, pharmaceutical and antibacterial materials, catalysis and mirror making, and ultrafine silver powder preparation.

[0003] The production process of silver nitrate products mainly consists of silver dissolution, impurity removal and filtration, evaporation and crystallization, washing and drying. In the existing production process, the evaporation and crystallization process is mostly intermittent, resulting in a long production cycle and low production efficiency. At present, evaporation and crystallization are an important part of the silver nitrate production process, but most of the evaporation and crystallization equipment currently takes a long time, affecting production efficiency and is not conducive to large-scale production. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a silver nitrate continuous evaporation crystallization device, which comprises an evaporating kettle, a freezing crystallizer, a centrifugal filter washer and a filtrate collecting tank, wherein the evaporating kettle is provided with a jacket, a double-layer stirring paddle I is provided inside, a filtrate feed port and a feed port I are provided on the top, a steam inlet and a steam outlet are provided on the outer jacket of the evaporating kettle; the freezing crystallizer is provided with a jacket, a double-layer stirring paddle II is provided inside, a feed pipe III is provided on the top, a chilled water inlet and a chilled water outlet are provided on the outer jacket of the freezing crystallizer; the centrifugal filter washer is provided with a There is a filtrate discharge port, and a solid material outlet is provided at the top; the filtrate feed port at the top of the evaporator is connected to the filtrate circulation pipeline, and the bottom of the evaporator is connected to the feed pipeline III of the freezing crystallizer through valve I feed pipeline I and liquid pump I in turn, and the discharge port II at the bottom of the freezing crystallizer is connected to the centrifugal filter washer through valve II and feed pipeline II, and the filtrate discharge port of the centrifugal filter washer is connected to the filtrate inlet of the filtrate collection tank through valve III, and the filtrate collection tank is connected to the filtrate circulation pipeline, valve IV and liquid pump II in turn. The freezing crystallizer and double-layer stirring paddle II are made of stainless steel 316L.

[0005] Compared with the prior art, the utility model has the following advantages: the utility model can carry out continuous evaporation and crystallization of silver nitrate, achieve the recycling of centrifugal mother liquor and washing filtrate, improve the evaporation and crystallization efficiency, and significantly improve the production efficiency of silver nitrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] The specific implementation modes of the present utility model are further described in detail below in conjunction with the accompanying drawings.

[0007] Figure 1 It is a structural schematic diagram of the utility model.

[0008] In the figure: 1—evaporation kettle 2—freezing crystallizer 3—centrifugal filter scrubber 4—filtrate collecting tank 5—filtrate feed port 6—steam inlet 7—steam outlet 8—valve Ⅰ 9—feed pipeline Ⅰ 10—liquid pump Ⅰ 11—double-layer stirring paddle Ⅰ 12—feed port Ⅰ 13—feed pipeline Ⅲ 14—double-layer stirring paddle Ⅱ 15—chilled water outlet 16—chilled water inlet 17—discharge port Ⅱ 18—valve Ⅱ 19—feed pipeline Ⅱ 20—solid material outlet 21—filtrate discharge port 22—valve Ⅲ 23—filtrate inlet 24—filtrate circulation pipeline 25—valve Ⅳ 26—liquid pump Ⅱ. DETAILED DESCRIPTION

[0009] like Figure 1 A silver nitrate continuous evaporation crystallization device, which comprises an evaporator 1, a freezing crystallizer 2, a centrifugal filter washer 3 and a filtrate collecting tank 4, the evaporator 1 is provided with a jacket, a double-layer stirring paddle Ⅰ11 is provided inside, a filtrate feed port 5 and a feed port Ⅰ12 are provided on the top, the outer jacket of the evaporator 1 is provided with a steam inlet 6 and a steam outlet 7; the freezing crystallizer 2 is provided with a jacket, a double-layer stirring paddle Ⅱ14 is provided inside, a feed pipeline Ⅲ13 is provided on the top, the outer jacket of the freezing crystallizer 2 is provided with a chilled water inlet 16 and a chilled water outlet 15; the centrifugal filter washer 3 is provided with a filtrate outlet 21 at the bottom, and a solid material outlet is provided on the top. The filtrate feed port 5 at the top of the evaporator 1 is connected to the filtrate circulation pipeline 24, the bottom of the evaporator 1 is connected to the feed pipeline Ⅲ13 of the freezing crystallizer 2 through the valve Ⅰ8 feed pipeline Ⅰ9 and the liquid pump Ⅰ10, the bottom discharge port Ⅱ17 of the freezing crystallizer 2 is connected to the centrifugal filter washer 3 through the valve Ⅱ18 and the feed pipeline Ⅱ19, the filtrate discharge port 21 of the centrifugal filter washer 3 is connected to the filtrate inlet 23 of the filtrate collecting tank 4 through the valve Ⅲ22, and the filtrate collecting tank 4 is connected to the filtrate circulation pipeline 24 through the filtrate circulation pipeline 24, the valve Ⅳ25 and the liquid pump Ⅱ26. The freezing crystallizer 2 and the double-layer stirring paddle Ⅱ14 are made of stainless steel 316L.

[0010] When in use, steam is introduced into the jacket of the evaporator 1 to evaporate and concentrate the silver nitrate solution, the solution is added to the freezing crystallizer 2 through the feed pipe 9 and the liquid pump 10, and chilled water is introduced into the jacket of the freezing crystallizer 2 to cool down and crystallize the silver nitrate. The suspension after freezing and crystallization is added to the centrifugal filter washer 3 for solid-liquid separation, the filtrate collecting tank 4 collects the centrifugal mother liquor and the washing filtrate, and then the solution is returned to the evaporator 1 through the liquid pump II 26 and the filtrate circulation pipe 24, and the evaporation and crystallization operation is continuously carried out, and the centrifugal mother liquor and the washing filtrate are recycled.

[0011] The above are preferred implementation modes of the present invention. Technicians in the field to which the present invention belongs can also change and modify the above implementation modes. Therefore, the present invention is not limited to the above specific implementation modes. Any obvious improvements, substitutions or modifications made by technicians in this field on the basis of the present invention belong to the protection scope of the present invention.

Claims

1. A silver nitrate continuous evaporation crystallization device, characterized in that: It comprises an evaporator (1), a freezing crystallizer (2), a centrifugal filter washer (3) and a filtrate collecting tank (4). The evaporator (1) is provided with a jacket, a double-layer stirring paddle I (11) is provided inside, and a filtrate feed port (5) and a feed port I (12) are provided on the top. The outer jacket of the evaporator (1) is provided with a steam inlet (6) and a steam outlet (7); the freezing crystallizer (2) is provided with a jacket, a double-layer stirring paddle II (14) is provided inside, and a feed pipe III (13) is provided on the top. The outer jacket of the freezing crystallizer (2) is provided with a chilled water inlet (16) and a chilled water outlet (15); the centrifugal filter washer (3) is provided with a filtrate outlet (21) at the bottom and a solid material outlet (20) at the top; the evaporator (1) is provided with a steam inlet (6) and a steam outlet (7) on the outer jacket. ) is connected to the filtrate feeding port (5) at the top of the evaporator (1), and the filtrate circulation pipeline (24); the bottom of the evaporator (1) is connected to the feeding pipeline III (13) of the freezing crystallizer (2) through the valve I (8), the feeding pipeline I (9) and the liquid pump I (10) in sequence; the discharge port II (17) at the bottom of the freezing crystallizer (2) is connected to the centrifugal filter washer (3) through the valve II (18) and the feeding pipeline II (19); the filtrate discharge port (21) of the centrifugal filter washer (3) is connected to the filtrate inlet (23) of the filtrate collecting tank (4) through the valve III (22); the filtrate collecting tank (4) is connected to the filtrate circulation pipeline (24) through the filtrate circulation pipeline (24), the valve IV (25) and the liquid pump II (26) in sequence.

2. A silver nitrate continuous evaporation crystallization device according to claim 1, characterized in that: The freezing crystallizer (2) and the double-layer stirring paddle II (14) are made of stainless steel 316L.

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