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Device and process for dissolving out cooling crystals of monazite alkali decomposition liquor

A technology for cooling crystallization and decomposing liquid, applied in solution crystallization, chemical industry, sustainable manufacturing/processing, etc. It can solve the problems of high energy consumption, large floor space, small output, etc., and achieve low impurity content and high cooling efficiency. , the effect of complete crystal form

Inactive Publication Date: 2016-11-23
永州市湘江稀土有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This crystallization method is suitable for products with a small output. The advantage is that the operation is simple, and the disadvantage is that the output is small, the energy consumption is high, and the floor area is large.

Method used

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  • Device and process for dissolving out cooling crystals of monazite alkali decomposition liquor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Air at 5°C is first blown into the device through the fan (8), and the 65°C decomposed lye is sprayed at the top of the device through the nozzle (5) using a high-speed centrifugal spray method, and the atomized droplets are below 0.2mm; through the air distribution plate (6 ) realizes rapid contact with the liquid droplets and takes away the heat, realizes the separation of the gas and the liquid droplets in the water vapor separation device (4), and the ratio of the flow rate of the decomposed lye liquid to the flow rate of the air is 1:4000.

[0031] The cooled droplets enter the crystallization part (11) under the action of gravity through the motor cover and the guide cover (7), and the temperature after cooling is 15°C, and they are uniformly precipitated under the stirring action of the stirring (9) Trisodium phosphate crystals are discharged through the discharge port (11). During the operation, the temperature of the decomposed liquid in the crystallization kett...

Embodiment 2

[0034] Air at 28°C is first blown into the device through the fan (8), and the 90°C decomposed lye is sprayed at the top of the device through the nozzle (5) using a high-speed centrifugal spray method, and the atomized droplets are below 0.1mm; through the air distribution plate (6 ) realizes rapid contact with the liquid droplets and takes away the heat, realizes the separation of the gas and the liquid droplets in the water vapor separation device (4), and the ratio of the flow rate of the decomposed lye liquid to the flow rate of the air is 1:2500.

[0035] The cooled droplets enter the crystallization kettle (11) under the action of gravity through the motor cover and the guide cover (7), the temperature is 34 ° C, and the phosphoric acid triphosphate is evenly precipitated under the stirring action of the stirring (9). The sodium crystal is discharged through the discharge port (11). During the operation, the temperature of the decomposed liquid in the crystallization ket...

Embodiment 3

[0038] Air at 15°C is first blown into the device through the fan (8), and the 85°C decomposed lye is sprayed at the top of the device through the nozzle (5) using a high-speed centrifugal spray method, and the atomized droplets are below 0.1mm; through the air distribution plate (6 ) realizes rapid contact with the liquid droplets and takes away the heat. In the water vapor separation device (4), by reducing the air velocity, the separation of the gas and the liquid droplets is realized, and the ratio of the flow rate of the decomposed lye liquid to the flow rate of the air is 1:1000.

[0039] The cooled droplets enter the crystallization kettle (11) under the action of gravity through the motor cover and the guide cover (7), and the temperature is 30°C. Under the agitation of the stirring (9), the triphosphate is evenly precipitated The sodium crystal is discharged through the discharge port (11). During the operation, the temperature of the decomposed liquid in the crystalli...

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Abstract

The invention relates to a device and process for dissolving out cooling crystals of monazite alkali decomposition liquor. The device comprises a storage tank, a feed pump, a temperature detector, a water-gas separation device, a sprayer, an air distribution plate, a motor cover and fairing, a draught fan, a stirrer, a discharge port and a crystallization part. The device is adopted for dissolving out the cooling crystals of the monazite alkali decomposition liquor, and dissolving-out and separating of the crystals of trisodium phosphate can be achieved. According to the process, an efficient spray cooling mode and a crystal stirring dissolving-out process are combined, no cooling water is massively used, liquid fully makes contact with air after being atomized, the characteristic of being high in cooling efficiency is achieved, evaporation and concentration of water accounting for about 3-5% of the solution can be achieved, and later concentration of alkali liquor is promoted. The decomposition alkali liquor flow and the air flow can be adjusted according to the cooling temperature, and the energy-saving effect is good.

Description

technical field [0001] The invention relates to a device and process for cooling and crystallizing monazite alkali decomposition liquid, which realizes the rapid cooling, crystallization and precipitation of sodium phosphate, and belongs to the field of rare earth ore smelting and production. Background technique [0002] Monazite is an industrial rare-earth phosphate mineral. In industry, the caustic soda decomposition method is generally used to process monazite concentrate. ("Rare Earth", Volume 1 of the first edition, Metallurgical Industry Press 1978, P221-237.) [0003] The equipment corrosion, labor protection and environmental protection in the caustic soda treatment process of monazite are relatively easy to solve, especially the associated element phosphorus is recovered in the form of trisodium phosphate, which is called the pollution-free alkaline method in rare earth smelting works. [0004] During the caustic soda decomposition process, rare earth and thorium ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D9/02C01B25/30
CPCY02P20/10
Inventor 李效平王凯
Owner 永州市湘江稀土有限责任公司
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