Ammonium chloride brine slurry cooling crystallization device and cooling crystallization method thereof
A technology of cooling crystallization and ammonium chloride salt, applied in the direction of heat exchange cooling crystallization, ammonium chloride, chemical instruments and methods, etc., can solve the problems of large floor area, frequent feeding blockage, and reduced product yield, and achieve The effect of total installed power and energy consumption reduction, reduction of floor area, and reduction of equipment investment
Active Publication Date: 2021-01-29
GUANGZHOU SCHIN TECH IND CO LTD
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Problems solved by technology
The technology adopted is "intermittent kettle-type cooling crystallization", and the existing improved technology is "continuous kettle-type cooling crystallization", which has the following technical defects: 1) Large floor area and slow cooling speed: because the material of the cooling kettle is generally enamel, traditional The thermal coefficient is low, so it can only rely on jacketed water cooling, and multiple cooling kettles are needed to complete the cooling crystallization (usually 5), which cannot be normally arranged and used in places where the scale of the site is limited; 2) Frequent blockage of feeding, complicated operation, High labor intensity: Due to the large number of cooling kettles, it takes a long time for each kettle to reach the cooling temperature at the end point, which will cause the salt block deposited at the bottom of the kettle to block the feeding valve, so that it must be dredged by hot water recoil before feeding to normal When cutting materials, when multiple cooling tanks are switched to use, it is very easy to make operational errors, delay continuous production, and cause economic losses; increase, the solubility becomes larger, and a part of ammonium chloride is dissolved, which reduces the yield of the product
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[0022] Below in conjunction with embodiment the present invention is described in further detail.
[0023] The application discloses a cooling crystallization device for ammonium chloride salt slurry, comprising: a vacuum cooling crystallization kettle 3 and a normal temperature cooling crystallization kettle 12; Stirring motor 31, in order to make the vacuum cooling crystallization kettle 3 better isolated from the outside air, between the stirring motor 31 and the vacuum cooling crystallization kettle 3 is a double-end mechanical seal of the sealing sleeve. The output end of the stirring motor 31 is connected to one end of the stirring shaft 4, and the propulsive stirring is adopted with a rotating speed of 80r / min. The purpose is to stir quickly to ensure that the solid-liquid ratio of the whole kettle is relatively uniform. The vacuum cooling crystallization kettle 3 is also provided with a liquid inlet guide tube 2 and a vacuum pump 32, and the liquid inlet guide tube 2 s...
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The invention discloses an ammonium chloride brine slurry cooling crystallization device and a cooling crystallization method thereof. The device comprise a stirring motor on a vacuum cooling crystallization kettle; the output end of the stirring motor is connected with a stirring shaft; the stirring motor is connected with the vacuum cooling crystallization kettle in a sealed mode; the vacuum cooling crystallization kettle is further provided with a liquid inlet flow guide pipe and a vacuum pump; the vacuum cooling crystallization kettle is connected with a first discharging valve and a second discharging valve; a recoil valve is arranged between the first discharging valve and the second discharging valve; the second discharging valve is connected with a discharge pump through a pipeline; a normal-temperature cooling crystallization kettle is provided with a water-cooling jacket and a motor; the output end of the motor is connected with a frame-type stirring shaft; the normal-temperature cooling crystallization kettle is provided with a feeding guide pipe; the feeding guide pipe is connected with a normal-temperature discharging valve; and the normal-temperature discharging valveis connected with a centrifugal machine through a pipeline; the discharging pump is connected with the feeding guide pipe through a conveying pipeline; a pressure sensor, a densimeter, a flow meter and a discharging valve are arranged on the conveying pipeline; the conveying pipeline is connected with the vacuum cooling crystallization kettle through a pipeline.
Description
technical field [0001] The invention relates to a chemical purification process, in particular to an ammonium chloride salt slurry cooling crystallization device and a method for cooling the ammonium chloride salt slurry crystallization method. Background technique [0002] The traditional ammonium chloride evaporative crystallization technology uses a three-effect falling film evaporator and a cooling crystallizer. First, in the evaporator, the dilute solution is concentrated to saturation by countercurrent evaporation, and then enters the cooling crystallizer to cool to about 40°C for crystallization, and the mother liquor is centrifuged and returned to the evaporator to continue evaporation. The technology adopted is "intermittent kettle-type cooling crystallization", and the existing improved technology is "continuous kettle-type cooling crystallization", which has the following technical defects: 1) Large floor area and slow cooling speed: because the material of the co...
Claims
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IPC IPC(8): B01D9/02C01C1/16
CPCB01D9/0013B01D9/005B01D9/0063C01C1/164B01D2009/0086Y02P20/10
Inventor毕永锐张密德黎锋蔡耿林林嘉华陈国威周双清
OwnerGUANGZHOU SCHIN TECH IND CO LTD