Processing technology of anti-corrosion carbon brick for circular phosphoric acid reaction tank baffle column

Abstract

The invention belongs to the technical field of anti-corrosion carbon brick processing, and particularly relates to a processing technology of an anti-corrosion carbon brick for a circular phosphoric acid reaction tank baffle column, which comprises the following steps: 1) raw material preparation: preparing a sintered carbon brick original block; 2) machining: cutting the sintered carbon brick original block into sheet-shaped brick blocks, and then cutting the sheet-shaped brick blocks into inverted Z-shaped special-shaped carbon bricks; and (3) dipping, curing, secondary dipping and secondary curing: carrying out dipping, curing, secondary dipping and secondary curing treatment on the special-shaped carbon brick to obtain the finished product carbon brick. The corrosion-resistant carbon brick produced by the invention is superior to a common impregnated and sintered carbon brick in the aspects of apparent porosity, compression resistance and breaking strength; and in practical application, the problem of cracking of the carbon brick can be effectively avoided, and safety accidents are reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of anti-corrosion carbon brick processing, and particularly relates to a processing technology of anti-corrosion carbon bricks for baffle columns of circular phosphoric acid reaction tanks. Background Art

[0002] In the modern industrial production of phosphoric acid, in order to increase production capacity and enhance the sufficient stirring and mixing of phosphate rock slurry, four deflection columns are generally added to the wall of the circular phosphoric acid reaction tank.

[0003] After the circular phosphoric acid reaction tank is built with a baffle column, the slurry that originally rotated along the tank wall changes its flow direction after hitting the baffle column, causing the slurry on the wall to be deflected toward the center of the circular tank, further mixing the slurry.

[0004] Combined with attachment Figure 2 It can be seen that on the front side of the deflector column (that is, the side facing the slurry), the anti-corrosion carbon bricks are subjected to a very strong impact force. Since the base of the anti-corrosion carbon bricks is built on the anti-corrosion rubber plate, the rubber plate is a flexible material, which inevitably causes the anti-corrosion carbon bricks on the surface of the deflector column to shift horizontally, causing the mortar joints of the anti-corrosion carbon bricks to crack. Over time, they will fall off, leading to frequent production accidents.

[0005] Therefore, the applicant considered improving the existing processing technology of anti-corrosion carbon bricks and designed a processing technology of anti-corrosion carbon bricks for baffle columns of circular phosphoric acid reaction tanks to solve the above problems. Summary of the Invention

[0006] In order to solve the above problems existing in the prior art, the present invention provides a processing technology for anti-corrosion carbon bricks for baffle columns of circular phosphoric acid reaction tanks, comprising the following steps:

[0007] 1) Raw material preparation: prepare sintered carbon brick blocks;

[0008] 2) Mechanical processing: split the sintered carbon bricks into sheet bricks, and then cut the sheet bricks into inverted Z-shaped special-shaped carbon bricks of a certain thickness;

[0009] 3) Impregnation, curing, secondary impregnation, and secondary curing: The shaped carbon bricks undergo impregnation, curing, secondary impregnation, and secondary curing to produce the finished carbon bricks. Because the carbon bricks used for baffle columns require higher physical (compressive and flexural) strength and lower porosity than ordinary impregnated and sintered carbon bricks, secondary impregnation and secondary curing are required to improve the compressive and flexural strength of the finished carbon bricks while reducing porosity.

[0010] Optionally, in step 1), the size of the sintered carbon brick block is 1730×770×660 mm.

[0011] Optionally, in step 3), both the impregnation and secondary impregnation treatments are: impregnation of the special-shaped carbon bricks with resin under vacuum-pressure conditions.

[0012] Optionally, in step 3), the curing treatment is: sending the special-shaped carbon bricks into a curing device for heating and curing, and the heating temperature is slowly increased, and the maximum curing temperature is 180°C.

[0013] Optionally, in step 2), the special-shaped carbon brick includes a first division, a second division and a third division from bottom to top, the thickness of the first division, the second division and the third division are the same, and the width of the three is set to d, the length of the first division is set to a, the length of the third division is set to b, the length of the second division is set to c, the angle between the third division and the second division is set to α, and the angle between the first division and the second division is set to β.

[0014] Optionally, in step 2), the thickness of the special-shaped carbon brick is 113 mm, the width d is 65 mm, the angle β between the first division and the second division is 90°, the length c of the second division and the angle α between the third division and the second division are determined according to actual on-site data, then the length a of the first division is 230 mm, and the length b of the third division is (230+65=)295 mm, or the length a of the first division is (230+65=)295 mm, and the length b of the third division is 230 mm.

[0015] Specifically, since the standard size of anti-corrosion carbon bricks is 230×113×65mm, the commonly used thickness when laying anti-corrosion carbon bricks is 113mm or 65mm. This solution adopts the corresponding values ​​under the condition of 113mm thickness; in addition, a and b are divided into two lengths, that is, two brick types, and the two brick types each account for 50%.

[0016] Optionally, in step 2), the thickness of the special-shaped carbon brick is 65 mm, the width d is 113 mm, the angle β between the first division and the second division is 90°, the length c of the second division and the angle α between the third division and the second division are determined according to actual on-site data, then the length a of the first division is 230 mm, and the length b of the third division is (230+113=)343 mm, or the length a of the first division is (230+113=)343 mm, and the length b of the third division is 230 mm.

[0017] Specifically, since the standard size of anti-corrosion carbon bricks is 230×113×65mm, the commonly used thickness when laying anti-corrosion carbon bricks is 113mm or 65mm. This solution adopts the corresponding values ​​for the thickness of 65mm; in addition, a and b are divided into two lengths, that is, two brick types, and the two brick types each account for 50%.

[0018] The beneficial effects of the present invention are:

[0019] (1) The anti-corrosion carbon bricks produced by the present invention have a compressive strength of more than 100 MPa (common impregnated and sintered carbon bricks are greater than 65 MPa), a flexural strength of more than 30 MPa (common impregnated and sintered carbon bricks are greater than 20 MPa), and an apparent porosity of less than 5% (common impregnated and sintered carbon bricks are less than 20%). All these data are superior to those of ordinary impregnated and sintered carbon bricks.

[0020] (2) Ordinary impregnated sintered carbon bricks generally have a standard brick size of 230×113×65mm, and are then lined up piece by piece with mortar; however, the anti-corrosion carbon bricks produced by the present invention are made into large integral blocks (reducing the mortar seams in the middle) on the load-bearing surfaces that need to be impact-resistant according to the on-site conditions, which can effectively avoid the problem of carbon brick cracking and reduce the occurrence of safety accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below with reference to the accompanying drawings and examples.

[0022] Figure 1 It is a process flow chart of the present invention.

[0023] Figure 2 Schematic diagram of the structure of the baffle column in the circular phosphoric acid reaction tank.

[0024] Figure 3 This is a schematic diagram of the anti-corrosion carbon bricks of the present invention being laid in a circular phosphoric acid reaction tank.

[0025] Figure 4 It is a structural schematic diagram of the special-shaped carbon brick of the present invention.

[0026] In the figure: 1. First division, 2. Second division, 3. Third division, 4. Baffle column, 5. Anti-corrosion carbon brick. DETAILED DESCRIPTION

[0027] The present invention is described below in conjunction with the accompanying drawings and specific embodiments of the present invention. The description herein is only used to explain the present invention and is not intended to limit the present invention. Based on the embodiments of the present invention, any modifications, equivalent substitutions, improvements, etc. made by those skilled in the art without creative work based on all other embodiments obtained in the present invention should be included in the scope of protection of the present invention.

[0028] Example 1

[0029] Combine Figure 1 and Figure 4 As shown, an embodiment of the present invention provides a process for processing anti-corrosion carbon bricks for baffle columns of a circular phosphoric acid reaction tank, comprising the following steps:

[0030] 1) Raw material preparation: Prepare sintered carbon brick blocks with dimensions of 1730×770×660mm.

[0031] 2) Mechanical processing: The sintered carbon brick blocks are divided into sheet bricks, and then the sheet bricks are cut into inverted Z-shaped special-shaped carbon bricks with a thickness of 113 mm; the special-shaped carbon bricks include a first division 1, a second division 2 and a third division 3 from bottom to top, the width of the first division, the second division and the third division are all d = 65 mm, the angle β between the first division and the second division is 90 °, the length c of the second division and the angle α between the third division and the second division are determined according to actual on-site data, the length a of the first division is 230 mm, and the length b of the third division is 295 mm, or the length a of the first division is 295 mm, and the length b of the third division is 230 mm, and the two types of bricks each account for 50%.

[0032] 3) Impregnation, curing, secondary impregnation, and secondary curing: The shaped carbon bricks are subjected to impregnation, curing, secondary impregnation, and secondary curing to obtain finished carbon bricks A. The impregnation and secondary impregnation processes are both performed by impregnating the shaped carbon bricks with resin under vacuum-pressure conditions. The curing process is performed by placing the shaped carbon bricks into a curing chamber for heating and curing, with the heating temperature slowly increasing to a maximum curing temperature of 180°C.

[0033] Example 2

[0034] The difference between this embodiment and embodiment 1 is that the sheet bricks are cut into inverted Z-shaped special-shaped carbon bricks with a thickness of 65 mm, the width of the three divisions of the special-shaped carbon bricks are d = 113 mm, the length of the first division is a = 230 mm, and the length of the third division is b = 343 mm, or the length of the first division is a = 343 mm, and the length of the third division is b = 230 mm, and the two types of bricks also account for 50% each, and the other steps are the same as in embodiment 1, and finally the finished carbon brick B is obtained.

[0035] The performance of ordinary impregnated sintered carbon bricks was compared with the above finished carbon bricks A and B. The results are shown in Table 1:

[0036] Performance Project Ordinary impregnated sintered carbon bricks Finished carbon brick A Finished carbon brick B Apparent porosity, % ＜20 ＜5 ＜5 Compressive strength at room temperature, MPa ＞65 ＞100 ＞100 Flexural strength at room temperature, MPa ＞20 ＞30 ＞30

[0037] Table 1

[0038] As can be seen from Table 1, ordinary impregnated and sintered carbon bricks have a high apparent porosity and low compressive and flexural strengths; while the finished carbon bricks A and B of the present invention not only have low apparent porosity, but also good compressive and flexural strengths, and all other properties are superior to ordinary impregnated and sintered carbon bricks, and have strong practicality.

[0039] From the appearance point of view, the standard brick size of ordinary impregnated sintered carbon bricks is generally

[0040] 230×113×65mm, and then lined up piece by piece by cement; and the anti-corrosion carbon brick 5 produced by the present invention, combined with the attached Figure 3 As shown, according to the on-site conditions, the load-bearing surface that needs to be impact-resistant is made into a whole large block (reducing the mortar seam in the middle), which can effectively avoid the cracking problem of carbon bricks and reduce the occurrence of safety accidents.

[0041] While the embodiments of the present invention have been described above, the above description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A process for processing anti-corrosion carbon bricks for baffle columns of circular phosphoric acid reaction tanks, characterized by: The following steps are involved: 1) Raw material preparation: prepare sintered carbon brick blocks; 2) Mechanical processing: split the sintered carbon bricks into sheet bricks, and then cut the sheet bricks into inverted Z-shaped special-shaped carbon bricks of a certain thickness; 3) Impregnation, curing, secondary impregnation and secondary curing: The special-shaped carbon bricks are subjected to impregnation, curing, secondary impregnation and secondary curing to obtain finished carbon bricks.

2. The processing technology of the anti-corrosion carbon bricks for the baffle columns of the circular phosphoric acid reaction tank according to claim 1 is characterized in that: In step 1), the size of the sintered carbon brick block is 1730×770×660 mm.

3. The processing technology of the anti-corrosion carbon bricks for the baffle columns of the circular phosphoric acid reaction tank according to claim 2 is characterized in that: In step 3), both the impregnation and secondary impregnation treatments are: impregnating the special-shaped carbon bricks with resin under vacuum-pressure conditions.

4. The processing technology of the anti-corrosion carbon bricks for the baffle columns of the circular phosphoric acid reaction tank according to claim 3 is characterized in that: In step 3), the curing treatment is as follows: the special-shaped carbon bricks are sent into a curing device for heating and curing, the heating temperature is slowly increased, and the maximum curing temperature is 180°C.

5. The processing technology of the anti-corrosion carbon bricks for the baffle columns of the circular phosphoric acid reaction tank according to claim 4 is characterized in that: In step 2), the special-shaped carbon bricks include a first division, a second division and a third division from bottom to top, the thickness of the first division, the second division and the third division are the same, and the width of the three is set to d, the length of the first division is set to a, the length of the third division is set to b, the length of the second division is set to c, the angle between the third division and the second division is set to α, and the angle between the first division and the second division is set to β.

6. The processing technology of the anti-corrosion carbon bricks for the baffle columns of the circular phosphoric acid reaction tank according to claim 5 is characterized in that: In step 2), the thickness of the special-shaped carbon brick is 113 mm, the width d is 65 mm, and the angle β between the first division and the second division is 90°. Then the length a of the first division is 230 mm, and the length b of the third division is 295 mm, or the length a of the first division is 295 mm, and the length b of the third division is 230 mm.

7. The process for processing the anti-corrosion carbon bricks for the baffle columns of the circular phosphoric acid reaction tank according to claim 5, characterized in that: In step 2), the thickness of the special-shaped carbon brick is 65 mm, the width d is 113 mm, and the angle β between the first division and the second division is 90°. Then the length a of the first division is 230 mm, and the length b of the third division is 343 mm, or the length a of the first division is 343 mm, and the length b of the third division is 230 mm.

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