CN209885796U

CN209885796U - Reaction unit is used in preparation of cerium oxalate precursor

Info

Publication number: CN209885796U
Application number: CN201920173062.0U
Authority: CN
Inventors: 李�荣; 郭江; 杜新玲; 杨继朋; 晁霞
Original assignee: Jiyuan Vocational and Technical College
Current assignee: Jiyuan Vocational and Technical College
Priority date: 2019-01-31
Filing date: 2019-01-31
Publication date: 2020-01-03
Anticipated expiration: 2029-01-31

Abstract

The utility model discloses a reaction unit for preparing a cerium oxalate precursor, which comprises a reaction kettle, wherein a servo motor is arranged on a kettle cover of the reaction kettle, an output shaft of the servo motor is in transmission connection with the upper end of a stirring paddle, the lower end of the stirring paddle is arranged in the reaction kettle body adjacent to the kettle bottom of the reaction kettle, and a discharge pipe communicated with the interior of the reaction kettle is arranged on the kettle bottom; the upper end of the reaction kettle is provided with more than or equal to 2 feeding nozzles around the circumference of the reaction kettle, the liquid outlet end of each feeding nozzle is arranged in the kettle body, the upper end of the reaction kettle is provided with an exhaust pipe, and the exhaust pipe is communicated with fluid in the reaction kettle; an electric heating block is arranged on the inner side wall of the kettle body; stop valves are arranged on the exhaust pipe and the discharge pipe. The utility model discloses can strengthen the liquid material dispersion degree in the reaction system, be favorable to improving product particle size homogeneity and product granularity.

Description

Reaction unit is used in preparation of cerium oxalate precursor

Technical Field

The utility model relates to the technical field of chemical industry. In particular to a reaction device for preparing a cerium oxalate precursor.

Background

At present, the rare earth cerium oxide precursor cerium oxalate prepared has unsatisfactory effects on nucleation rate and growth rate, and the prepared precursor cerium oxalate has undersize particles and poor particle size uniformity. The influence of the operation conditions on the reaction precipitation process and the granularity distribution of the crystallized product has a plurality of experimental researches at home and abroad. The operating conditions, i.e. external factors, such as the feed position, the reactant concentration, the specific power, the supersaturation, the material addition rate, etc., have an influence on the precipitation process and the particle size and particle size distribution of the crystalline product. Wherein, reinforced position, reactant concentration, specific power, supersaturation and material dropwise add speed all can artificially adjust and control, but present reaction unit all adopts direct injection formula reinforced, and the material is added and need be dispersed through rabbling mechanism after the reaction unit, and this has just caused the cerium oxalate granule particle size uneven of generation.

SUMMERY OF THE UTILITY MODEL

Therefore, the technical problem to be solved in the present invention is to provide a reaction apparatus for preparing cerium oxalate precursor, which can enhance the dispersion degree of liquid material in the reaction system, and is favorable for improving the uniformity of product particle size and product particle size.

In order to solve the technical problem, the utility model provides a following technical scheme:

a reaction device for preparing a cerium oxalate precursor comprises a reaction kettle, wherein a servo motor is installed on a kettle cover of the reaction kettle, an output shaft of the servo motor is in transmission connection with the upper end of a stirring paddle, the lower end of the stirring paddle is arranged in the reaction kettle body adjacent to the kettle bottom of the reaction kettle, and a discharge pipe communicated with the interior of the reaction kettle is arranged on the kettle bottom; the upper end of the reaction kettle is provided with more than or equal to 2 feeding nozzles around the circumference of the reaction kettle, the liquid outlet end of each feeding nozzle is arranged in the kettle body, the upper end of the reaction kettle is provided with an exhaust pipe, and the exhaust pipe is communicated with fluid in the reaction kettle; an electric heating block is arranged on the inner side wall of the kettle body; stop valves are arranged on the exhaust pipe and the discharge pipe.

In the reaction device for preparing the cerium oxalate precursor, the stirring paddle comprises a rotating shaft and blades, the upper end of the rotating shaft is in transmission connection with the output shaft of the servo motor, 2 or more groups of blades are axially arranged on the lower end of the rotating shaft along the rotating shaft, and each group of blades is circumferentially arranged on the rotating shaft along the rotating shaft; the blades in each group of blades are the same in length.

In the reaction apparatus for preparing a cerium oxalate precursor, the paddle positioned above is longer than the paddle positioned below.

In the reaction device for preparing the cerium oxalate precursor, the distance between two adjacent groups of the blades is equal to the length difference between the two adjacent groups of the blades.

According to the reaction device for preparing the cerium oxalate precursor, the blades are provided with the auxiliary blades, and the length of each auxiliary blade is smaller than the distance between every two adjacent groups of blades.

Above-mentioned reaction unit is used in cerium oxalate precursor, demountable installation has the filter screen component on the discharging end mouth of pipe of discharging pipe.

The reaction device for preparing the cerium oxalate precursor is characterized in that the kettle body is provided with an observation hole.

The technical scheme of the utility model following profitable technological effect has been obtained:

1. the utility model discloses utilize reinforced shower nozzle to spout reaction material to reation kettle inside, can shorten the time of reaction material dispersion in reation kettle, be favorable to generating the comparatively cerium oxalate granule that is close of granularity simultaneously.

2. The stirring degree of different liquid layers in the reaction solution in the reaction kettle is different by each group of blades with different overlength degrees, so that cerium oxalate particles generated in the surface layer can be reduced to the lower layer to continue to grow, the stirring degree of the liquid layer below is smaller, and the growth of the cerium oxalate particles is facilitated.

3. The filter screen component on the discharge pipe can be used for cleaning the reaction kettle while washing the cerium oxalate product, so that the water consumption for washing the cerium oxalate product and the reaction kettle is reduced.

Drawings

FIG. 1 is a schematic structural diagram of the reaction apparatus for preparing cerium oxalate precursor of the present invention.

In the figure, 1-kettle body; 2-kettle cover; 3-kettle bottom; 4-a servo motor; 5-a rotating shaft; 6-a blade; 7-secondary blade; 8-a feeding spray head; 9-an exhaust pipe; 10-a stop valve; 11-an electrical heating block; 12-a discharge pipe; 13-a sieve member; 14-Observation hole.

Detailed Description

As shown in fig. 1, the reaction device for preparing cerium oxalate precursor of the present invention comprises a reaction kettle, wherein a servo motor 4 is installed on a kettle cover 2 of the reaction kettle, an output shaft of the servo motor 4 is in transmission connection with an upper end of a stirring paddle, a lower end of the stirring paddle is arranged in the reaction kettle body 1 adjacent to a kettle bottom 3 of the reaction kettle, and a discharge pipe 12 communicated with the interior of the reaction kettle is arranged on the kettle bottom 3; 4 feeding nozzles 8 are circumferentially arranged at the upper end of the reaction kettle around the reaction kettle, the liquid outlet end of each feeding nozzle 8 is arranged in the kettle body 1, an exhaust pipe 9 is arranged at the upper end of the reaction kettle, and the exhaust pipe 9 is communicated with fluid in the reaction kettle; an electric heating block 11 is arranged on the inner side wall of the kettle body 1; stop valves 10 are respectively arranged on the exhaust pipe 9 and the discharge pipe 12. The feeding nozzle 8 can disperse the liquid material into small droplets, and then the small droplets fall into the reaction system in the reaction kettle to react, so that the dispersion of the liquid material in the reaction system is facilitated, and the uniformity of the particle size of the precipitate generated in the reaction system is further facilitated to be improved.

Wherein, the stirring rake includes pivot 5 and

paddle

6, 5 upper ends in pivot with 4 output shaft transmission of servo motor are connected, follow on the 5 lower extremes in pivot 5 axial is installed 3 groups paddle 6, every group paddle 6 has 3 paddle 6, every group paddle 6 is followed 5 circumference in pivot is installed in 5, and every group 6 paddle 6 length in the paddle 6 is the same. In order to facilitate the generated precipitate particles to sink and facilitate the precipitate particles to continue growing in the process of sinking, the paddle 6 positioned above is longer than the paddle 6 positioned below, the distance between two adjacent groups of paddles 6 is equal to the difference between the lengths of the paddles 6 in the two adjacent groups of paddles 6, and the paddles 6 of the two groups of paddles 6 above are provided with auxiliary blades 7, and the length of the auxiliary blades 7 is smaller than the distance between the two adjacent groups of paddles 6. On the stirring rake, through the differentiation setting for the reaction solution on reaction system top layer and adjacent top layer stirs the degree comparatively fiercely, more is favorable to the top layer and is close to the mixture between the reaction material on top layer, and then is favorable to the precipitate granule granularity of production comparatively even, is convenient for utilize the precipitate granule that has generated to make the great precipitate of particle diameter.

In the existing reaction equipment, the material after reaction is discharged through a liquid discharge pipe, then the product is taken out from the reaction kettle, and then the reaction kettle and the precipitate are respectively cleaned, the water consumption is relatively high, in the embodiment, a filter screen member 13 is detachably mounted on a pipe orifice at the discharge end of the discharge pipe 12, so that the reaction kettle can be cleaned when the precipitate is cleaned, after the precipitate is cleaned, the filter screen member 13 is detached, and then the precipitate is taken out through the discharge pipe 12.

In order to understand the reaction progress, especially the growth of the precipitate, in this embodiment, the observing hole 14 is provided on the kettle body 1.

Use the utility model discloses the time, with one of the reaction material cerous nitrate solution, then open servo motor 4, the switch-on simultaneously the power of electrical heating piece 11 is waited reaction solution temperature in the reation kettle rises to predetermineeing reaction temperature, passes through oxalic acid solution through the charge pump reinforced shower nozzle 8 spout into in the reation kettle, oxalic acid solution falls into cerous nitrate solution with the form of droplet and takes place to react with cerous nitrate solution, forms the cerous oxalate and deposits, because oxalic acid solution falls into cerous nitrate solution with the droplet form, cerous nitrate solution is in addition always the stirring effect of stirring rake is rotating down to be favorable to the dispersion of oxalic acid solution in cerous nitrate solution, avoided forming the bulk and depositing in directly injecting cerous nitrate solution through the filling tube, thereby be favorable to forming the narrower cerous oxalate precipitation granule of particle size distribution. As the size of the cerium oxalate particles is increased, the cerium oxalate can be precipitated downwards, and the length of the paddle 6 positioned at the lower part is shorter, so that the stirring effect on the reaction solution is relatively smaller, and the increase of the cerium oxalate particles is facilitated. As the reaction proceeds, the temperature of the reaction system and the rotation speed of the stirring paddle can be lowered, which is advantageous for the enlargement of the cerium oxalate particles. After the reaction is finished, the stop valve 10 on the discharge pipe 12 is opened, the solution in the reaction kettle is discharged, then the precipitate is washed by deionized water, then the filter screen member 13 is detached, and then the precipitate is removed from the reaction kettle by deionized water. In the reaction process, in order to control the gas pressure in the reaction kettle, the stop valve 10 on the exhaust pipe 9 can be opened, and the gas outlet of the exhaust pipe 9 is communicated with a harmful gas absorption device.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications are possible which remain within the scope of the appended claims.

Claims

1. The reaction device for preparing the cerium oxalate precursor is characterized by comprising a reaction kettle, wherein a servo motor (4) is installed on a kettle cover (2) of the reaction kettle, an output shaft of the servo motor (4) is in transmission connection with the upper end of a stirring paddle, the lower end of the stirring paddle is arranged in a kettle body (1) of the reaction kettle, which is adjacent to a kettle bottom (3) of the reaction kettle, and a discharge pipe (12) communicated with the interior of the reaction kettle is arranged on the kettle bottom (3); the upper end of the reaction kettle is provided with more than or equal to 2 feeding nozzles (8) around the circumference of the reaction kettle, the liquid outlet end of each feeding nozzle (8) is arranged in the kettle body (1), the upper end of the reaction kettle is provided with an exhaust pipe (9), and the exhaust pipe (9) is communicated with fluid in the reaction kettle; an electric heating block (11) is arranged on the inner side wall of the kettle body (1); stop valves (10) are respectively arranged on the exhaust pipe (9) and the discharge pipe (12); a filter screen component (13) is detachably arranged on the pipe orifice at the discharge end of the discharge pipe (12); the stirring paddle comprises a rotating shaft (5) and blades (6), the upper end of the rotating shaft (5) is in transmission connection with an output shaft of the servo motor (4), more than or equal to 2 groups of the blades (6) are axially arranged on the lower end of the rotating shaft (5) along the rotating shaft (5), and each group of the blades (6) is circumferentially arranged on the rotating shaft (5) along the rotating shaft (5); the blades (6) in each group of blades (6) are of the same length, the blades (6) positioned above being longer than the blades (6) positioned below.

2. The reaction device for preparing a cerium oxalate precursor according to claim 1, wherein the distance between two adjacent sets of the blades (6) is equal to the difference in the lengths of the blades (6) in the two adjacent sets of the blades (6).

3. The reaction device for preparing a cerium oxalate precursor according to claim 1, wherein a secondary blade (7) is mounted on the blades (6), and the length of the secondary blade (7) is smaller than the distance between two adjacent groups of the blades (6).

4. The reaction apparatus for preparing a cerium oxalate precursor according to any one of claims 1 to 3, wherein the vessel body (1) is provided with an observation hole (14).