A support beam for a sulphuric acid tower and a method of manufacture

Abstract

The application discloses a sulfuric acid tower supporting strip beam and a preparation method thereof, and relates to the field of chemical equipment. The sulfuric acid tower supporting strip beam comprises spodumene, kaolin, zirconium oxide and potassium feldspar, and the proportions of various components are calculated according to weight percentage, that is, the proportion of spodumene is 65-75%, the proportion of kaolin is 18-27%, the proportion of zirconium oxide is 2-6%, and the proportion of potassium feldspar is 4-6%. The sulfuric acid tower supporting strip beam prepared by using the preparation method has good thermal shock resistance in a high-temperature, high-pressure and high-acid environment, can bear the impact of rapid cooling and rapid heating, and is not prone to breakage, so that the operation efficiency and safety of the sulfuric acid tower are improved.

Description

TECHNICAL FIELD

[0001] The application relates to the field of chemical equipment, in particular to a sulfuric acid tower support beam and a preparation method. BACKGROUND

[0002] The sulfuric acid tower is a kind of chemical equipment for producing sulfuric acid, which has multiple layers of filler layers inside for improving the efficiency of gas-liquid contact and the yield and quality of sulfuric acid. The filler layers of the sulfuric acid tower need to be supported by support beams, and the material of the support beams is required to have good corrosion resistance, wear resistance and mechanical strength, and also has certain thermal shock resistance, because the working temperature of the sulfuric acid tower is relatively high, and sudden cooling and heating may occur, which increases the thermal stress of the support beam and easily causes cracking or breaking, affecting the normal operation and safety of the sulfuric acid tower.

[0003] At present, the materials of the support beams in the sulfuric acid tower mainly include ordinary porcelain and high-alumina porcelain, and the two kinds of materials have good corrosion resistance, wear resistance and mechanical strength, but their thermal shock resistance is poor, and they cannot withstand more than three times of temperature drop from 200 DEG C to 30 DEG C without cracking. In actual use, the thermal shock resistance range is too narrow, and the beam is often broken, which brings great difficulty and cost to the maintenance and replacement of the sulfuric acid tower.

[0004] Therefore, there is an urgent need for a sulfuric acid tower support beam with high thermal shock resistance and a preparation method, which can not crack under high temperature and sudden cooling and heating conditions, and can improve the stability and reliability of the sulfuric acid tower. SUMMARY

[0005] The purpose of the present application is to provide a sulfuric acid tower support beam and a preparation method, which can withstand sudden cooling and heating impact in high-temperature, high-pressure and high-acid environments, and is not easy to break, thereby improving the operation efficiency and safety of the sulfuric acid tower.

[0006] The above-mentioned optimized structure of the present application is realized by the following technical scheme: a sulfuric acid tower support beam, which comprises spodumene, kaolin, zirconia and potassium feldspar, and the proportions of various components calculated by weight percentage are as follows: the spodumene is 65%-75%, the kaolin is 18%-27%, the zirconia is 2%-6%, and the potassium feldspar is 4%-6%.

[0007] In some embodiments, the proportions of various components calculated by weight percentage are as follows: the spodumene is 70%-75%, the kaolin is 18%-22%, the zirconia is 2%-5%, and the potassium feldspar is 4%-6%.

[0008] In some embodiments, the weight ratio between the spodumene, the kaolin, the zirconia and the potassium feldspar is 72:20:3:5.

[0009] A method for preparing a support beam for a sulfuric acid tower, comprising the following steps:

[0010] S1: mixing spodumene, kaolin, zirconia and potassium feldspar according to a certain weight ratio, grinding into fine powder, and screening out powder with particle size less than 200 mesh;

[0011] S2: stirring the powder with water to form uniform mud, and placing the mud into a vacuum defoaming machine for defoaming treatment to remove as many bubbles in the mud as possible;

[0012] S3: injecting the defoamed mud into a mold for extrusion molding to obtain a beam blank with a desired shape;

[0013] S4: placing the beam blank into a drying chamber, controlling the temperature at about 80°C, and drying for 24 hours to reduce the water content of the beam blank to below 5%;

[0014] S5: placing the dried beam blank into a high-temperature furnace for sintering treatment, with a heating rate of 5°C / min, a holding temperature of 1200°C, a holding time of 2 hours, and then naturally cooling to obtain a finished support beam.

[0015] In some embodiments, the step of grinding into fine powder comprises: mixing spodumene, kaolin, zirconia and potassium feldspar according to a certain weight ratio, placing them into a ball mill for wet ball milling, ball milling for 2-4 hours, filtering, drying and crushing the ball-milled powder, and then screening out the desired powder through a 200 mesh sieve.

[0016] In some embodiments, the step of stirring the powder with water to form uniform mud comprises: mixing the powder with water according to a weight ratio of 1:0.5-1:0.8, placing them into a stirrer for stirring for 10-20 minutes, and the water content of the stirred mud is 30-40%.

[0017] In some embodiments, the mold is made of metal material, has a shape and size corresponding to the beam on the inner wall, and the inner wall surface is coated with a layer of anti-adhesive agent to facilitate the removal of the beam blank from the mold.

[0018] In some embodiments, the step of defoaming treatment comprises: placing the stirred mud into a vacuum defoaming machine, setting the vacuum degree to 0.08-0.1 MPa, defoaming for 15-30 minutes, and the water content of the defoamed mud is 25-35%.

[0019] In some embodiments, the high-temperature furnace is a tunnel furnace, and the temperature in the furnace is divided into a preheating zone, a sintering zone and a cooling zone, the temperature of the preheating zone is 300-600 DEG C, the temperature of the sintering zone is 1200 DEG C, and the temperature of the cooling zone is 600-200 DEG C, and the running speed of the strip beam blank in the furnace is 0.5-1 m / min.

[0020] In some embodiments, the finished support strip beam is a rectangular flat plate, and a plurality of grooves are arranged on the upper and lower surfaces of the finished support strip beam respectively.

[0021] The one or more technical solutions described above in the embodiments of the present application have at least the following technical effects or advantages:

[0022] (1) The support strip beam of the present application uses spodumene as the main raw material, and spodumene is a ceramic material with excellent acid resistance, high-temperature resistance and thermal shock resistance, and its deformation is almost zero in rapid cooling and heating, so the support strip beam of the present application can be directly reduced from 1200 DEG C to room temperature for many times without cracking, directly solving the problem that the existing support strip beam can only be reduced to 30 DEG C within 200 DEG C for three times without cracking, and the anti-thermal shock interval is too narrow in actual use, and the strip beam is often broken.

[0023] (2) The support strip beam of the present application further adds other components such as kaolin, zirconia and potassium feldspar to adjust the sintering performance of spodumene, reduce the sintering temperature, increase the strength and toughness of the strip beam, so that the support strip beam of the present application has higher mechanical strength and acid resistance than the existing support strip beam, and can bear greater load and stronger sulfuric acid corrosion.

[0024] (3) The preparation method of the support strip beam of the present application is simple, feasible and economical, and adopts conventional processes such as wet ball milling, vacuum defoaming, extrusion molding, drying and sintering, without special equipment and conditions, easy to implement and control, capable of guaranteeing the quality and consistency of the strip beam, reducing production cost and energy consumption. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0026] Figure 1 The flowchart of the preparation method of the present application. DETAILED DESCRIPTION

[0027] Embodiments of the present application are described in detail below with reference to the attached drawing figures, wherein the same or like reference numerals and characters throughout the figures denote the same or like elements or components, which detailed description is only exemplary and intended to explain the present application and not to restrict the present application.

[0028] In the description of the present application, it is to be understood that the orientations or positional relationships indicated by the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0029] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features referred to. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.

[0030] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0031] Reference Figure 1 A sulfuric acid tower support strip beam, comprising spodumene, kaolin, zirconia and potassium feldspar, the proportions of various components calculated by weight percentage are as follows: spodumene 65%-75%, kaolin 18%-27%, zirconia 2%-6%, potassium feldspar 4%-6%.

[0032] In some embodiments, the proportions of various components calculated by weight percentage are as follows: spodumene 70%-75%, kaolin 18%-22%, zirconia 2%-5%, potassium feldspar 4%-6%.

[0033] A preparation method of a sulfuric acid tower support strip beam, comprising the following steps:

[0034] S1: mixing spodumene, kaolin, zirconia and potassium feldspar according to a certain weight ratio, grinding into fine powder, and screening out powder with particle size less than 200 mesh;

[0035] The step of grinding into fine powder is: mixing spodumene, kaolin, zirconia and potassium feldspar according to a certain weight ratio, putting them into a ball mill for wet ball milling, the ball milling time is 2-4 hours, and the powder after ball milling is filtered, dried, crushed, and then screened through a 200 mesh sieve to obtain the required powder.

[0036] S2: stirring the powder with water to form a uniform mud, and putting the mud into a vacuum defoaming machine for defoaming treatment to remove as much air bubble in the mud as possible;

[0037] The step of stirring the powder with water to form a uniform mud is: mixing the powder with water according to a weight ratio of 1:0.5-1:0.8, putting them into a stirrer for stirring, the stirring time is 10-20 minutes, and the water content of the stirred mud is 30%-40%;

[0038] The step of defoaming treatment is: putting the stirred mud into a vacuum defoaming machine, setting the vacuum degree to 0.08-0.1 MPa, and defoaming for 15-30 minutes, and the water content of the defoamed mud is 25%-35%;

[0039] S3: injecting the defoamed mud into a mold for extrusion molding to obtain a strip beam blank with a desired shape;

[0040] S4: putting the strip beam blank into a drying chamber, controlling the temperature at about 80℃, and drying for 24 hours to reduce the water content of the strip beam blank to below 5%;

[0041] S5: putting the dried strip beam blank into a high-temperature furnace for sintering treatment, the heating rate is 5℃ / min, the holding temperature is 1200℃, the holding time is 2 hours, and then naturally cooling to obtain a finished support strip beam.

[0042] The obtained support strip beam can be a rectangular flat plate, the length can be 2000mm, the width can be 264mm, and the thickness can be 65mm, a plurality of grooves are arranged on the upper and lower surfaces respectively, which can be used to increase the contact area of the strip beam and the filler layer and improve the stability, the shape of the groove can be trapezoidal, the upper base length is 10mm, the lower base length is 15mm, the height is 5mm, and the distance between adjacent two grooves is 20mm, a plurality of holes are arranged around the groove for fixing the position of the strip beam in the tower body, the diameter of the hole is 10mm, and the hole is located at the edge of the strip beam, 100mm away from both ends of the strip beam.

[0043] In some embodiments, the mold is made of metal material, the inner wall of which has a shape and size corresponding to the strip beam, and the inner wall surface of which is coated with an anti-sticking agent to facilitate the stripping of the strip beam blank from the mold.

[0044] In some embodiments, the high-temperature furnace is a tunnel furnace, and the temperature in the furnace is divided into a preheating zone, a sintering zone and a cooling zone. The temperature in the preheating zone is 300-600°C, the temperature in the sintering zone is 1200°C, and the temperature in the cooling zone is 600-200°C. The running speed of the strip beam blank in the furnace is 0.5-1 m / min, and the inner wall of the furnace is coated with a high-temperature-resistant heat insulation material to reduce heat loss.

[0045] Embodiment 1

[0046] Lithium feldspar, kaolin, zirconia and potassium feldspar are mixed in a weight ratio of 68:24:4:4, put into a ball mill for wet ball milling, and the ball milling time is 3 hours. The milled powder is filtered, dried, crushed, and then sieved through a 200-mesh screen to obtain the desired powder. The powder is mixed with water in a weight ratio of 1:0.6, and then put into a mixer for stirring for 15 minutes. The water content of the stirred mud is 35%. The stirred mud is put into a vacuum degassing machine, the vacuum degree is set to 0.09 MPa, and the degassing time is 20 minutes. The water content of the degassed mud is 30%. The degassed mud is injected into a metal mold for extrusion molding to obtain a strip beam blank with the desired shape. The strip beam blank is placed in a drying chamber and the temperature is controlled at 80°C for 24 hours to reduce the water content of the strip beam blank to below 5%. The dried strip beam blank is placed in a tunnel furnace for sintering treatment at a heating rate of 5°C / min, a holding temperature of 1200°C, a holding time of 2 hours, and then naturally cooled to obtain a finished support strip beam. The size of the finished support strip beam is 2000 mm x 264 mm x 65 mm.

[0047] Embodiment 2

[0048] The lithium spodumene, kaolin, zirconia and potassium feldspar are mixed according to the weight ratio of 70:22:4:4, put into a ball mill for wet ball milling, the ball milling time is 2.5 hours, the powder after ball milling is filtered, dried, crushed, and then the required powder is separated through a 200 mesh sieve. The powder and water are mixed according to the weight ratio of 1:0.7, put into a stirrer for stirring, the stirring time is 12 minutes, the water content of the stirred mud is 32%. The stirred mud is put into a vacuum degassing machine, the vacuum degree is set to 0.1 MPa, the degassing time is 25 minutes, the water content of the degassed mud is 28%. The degassed mud is injected into a metal mold for extrusion molding to obtain a strip beam blank with the required shape. The strip beam blank is put into a drying room, the temperature is controlled at 80℃, dried for 24 hours, so that the water content of the strip beam blank is reduced to below 5%. The dried strip beam blank is put into a tunnel furnace for sintering treatment, the heating rate is 5℃ / min, the holding temperature is 1200℃, the holding time is 2 hours, and then naturally cooled to obtain a finished product support strip beam. The size of the finished product support strip beam is 2000mm×264mm×65mm.

[0049] Example 3:

[0050] The lithium spodumene, kaolin, zirconia and potassium feldspar are mixed according to the weight ratio of 65:25:5:5, put into a ball mill for wet ball milling, the ball milling time is 4 hours, the powder after ball milling is filtered, dried, crushed, and then the required powder is separated through a 200 mesh sieve. The powder and water are mixed according to the weight ratio of 1:0.8, put into a stirrer for stirring, the stirring time is 20 minutes, the water content of the stirred mud is 40%. The stirred mud is put into a vacuum degassing machine, the vacuum degree is set to 0.08 MPa, the degassing time is 15 minutes, the water content of the degassed mud is 25%. The degassed mud is injected into a metal mold for extrusion molding to obtain a strip beam blank with the required shape. The strip beam blank is put into a drying room, the temperature is controlled at 80℃, dried for 24 hours, so that the water content of the strip beam blank is reduced to below 5%. The dried strip beam blank is put into a tunnel furnace for sintering treatment, the heating rate is 5℃ / min, the holding temperature is 1200℃, the holding time is 2 hours, and then naturally cooled to obtain a finished product support strip beam. The size of the finished product support strip beam is 2000mm×264mm×65mm.

[0051] Example 4:

[0052] The spodumene, kaolin, zirconia and potassium feldspar are mixed according to the weight ratio of 70:20:3:5, put into a ball mill for wet ball milling, the ball milling time is 3.5 hours, the powder after ball milling is filtered, dried, crushed, and then the required powder is separated through a 200 mesh sieve. The powder and water are mixed according to the weight ratio of 1:0.65, put into a stirrer for stirring, the stirring time is 18 minutes, the water content of the stirred mud is 37%. The stirred mud is put into a vacuum degassing machine, the vacuum degree is set to 0.095 MPa, the degassing time is 22 minutes, the water content of the degassed mud is 29%. The degassed mud is injected into a metal mold for extrusion molding to obtain a strip beam blank with the required shape. The strip beam blank is put into a drying room, the temperature is controlled at 80℃, and dried for 24 hours to reduce the water content of the strip beam blank to below 5%. The dried strip beam blank is put into a tunnel furnace for sintering treatment, the heating rate is 5℃ / min, the holding temperature is 1200℃, the holding time is 2 hours, and then naturally cooled to obtain a finished support strip beam, the size of the finished support strip beam is 2000mm×264mm×65mm.

[0053] Example 5:

[0054] The spodumene, kaolin, zirconia and potassium feldspar are mixed according to the weight ratio of 67:26:3:4, put into a ball mill for wet ball milling, the ball milling time is 3 hours, the powder after ball milling is filtered, dried, crushed, and then the required powder is separated through a 200 mesh sieve. The powder and water are mixed according to the weight ratio of 1:0.55, put into a stirrer for stirring, the stirring time is 10 minutes, the water content of the stirred mud is 30%. The stirred mud is put into a vacuum degassing machine, the vacuum degree is set to 0.085 MPa, the degassing time is 18 minutes, the water content of the degassed mud is 27%. The degassed mud is injected into a metal mold for extrusion molding to obtain a strip beam blank with the required shape. The strip beam blank is put into a drying room, the temperature is controlled at 80℃, and dried for 24 hours to reduce the water content of the strip beam blank to below 5%. The dried strip beam blank is put into a tunnel furnace for sintering treatment, the heating rate is 5℃ / min, the holding temperature is 1200℃, the holding time is 2 hours, and then naturally cooled to obtain a finished support strip beam, the size of the finished support strip beam is 2000mm×264mm×65mm.

[0055] In order to prove the beneficial effects of the present application, the following five examples are given, and comparative experiments are carried out with ordinary porcelain support strip beams and high-alumina porcelain support strip beams. The results of the comparative experiments are shown in Table 1:

[0056] Table 1

[0057]

[0058] As can be seen from Table 1, the sulfuric acid tower support strip beam of the present application adopts spodumene, kaolin, zirconia and potassium feldspar as raw materials, through specific proportioning, molding and sintering process, so that the support strip beam has high strength and high acid resistance, and compared with the existing ordinary porcelain support strip beam and high-alumina porcelain support strip beam, can directly drop to normal temperature without cracking at 1200 DEG C, and is not easy to wear, deformation or corrosion, and is suitable for high-temperature, high-pressure and high-acidity sulfuric acid tower environment.

[0059] The above examples are only used to illustrate the technical solutions of the present application, but not limit it; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A sulfuric acid tower support beam characterized by, The various components include spodumene, kaolin, zirconia and potassium feldspar, and the proportions of the various components are calculated by weight percentage: the spodumene is 65%-75%, the kaolin is 18%-27%, the zirconia is 2%-6%, and the potassium feldspar is 4%-6%.

2. A support beam for a sulphuric acid tower according to claim 1, characterised in that: The various components include spodumene, kaolin, zirconia and potassium feldspar, and the proportions of the various components are calculated by weight percentage: the spodumene is 65%-75%, the kaolin is 18%-27%, the zirconia is 2%-6%, and the potassium feldspar is 4%-6%.

3. A support beam for a sulphuric acid tower according to claim 1, characterised in that: The weight ratio between the spodumene, the kaolin, the zirconia and the potassium feldspar is 72:20:3:

5.

4. A method for the production of a sulphuric acid tower support beam for the production of a sulphuric acid tower support beam according to any one of claims 1 to 3, characterised in that: The method comprises the following steps: S1: Spodumene, kaolin, zirconia and potassium feldspar are mixed in a certain weight ratio, ground into fine powder, and sieved to obtain powder with a particle size of less than 200 mesh; S2: The powder is stirred with water to form a uniform mud, and the mud is placed in a vacuum defoaming machine for defoaming treatment to remove as many bubbles in the mud as possible; S3: The defoamed mud is injected into a mold for extrusion molding to obtain a strip beam blank body with a desired shape; S4: The strip beam blank body is placed in a drying chamber, the temperature is controlled at about 80℃, and the strip beam blank body is dried for 24 hours to reduce the water content to below 5%; S5: The dried strip beam blank body is placed in a high-temperature furnace for sintering treatment, the heating rate is 5℃ / min, the holding temperature is 1200℃, the holding time is 2 hours, and then the product is naturally cooled to obtain a finished support strip beam.

5. A method of making a support beam for a sulphuric acid tower according to claim 4, characterised in that: The step of grinding into fine powder comprises the following steps: spodumene, kaolin, zirconia and potassium feldspar are mixed in a certain weight ratio, placed in a ball mill for wet ball milling, the ball milling time is 2-4 hours, and the powder after ball milling is filtered, dried, crushed, and then sieved through a 200 mesh screen to obtain the required powder.

6. A method of making a support beam for a sulphuric acid tower according to claim 4, characterised in that: The step of stirring the powder with water to form a uniform mud comprises the following steps: the powder and water are mixed in a weight ratio of 1:0.5-1:0.8, placed in a stirrer for stirring, the stirring time is 10-20 minutes, and the water content of the stirred mud is 30%-40%.

7. The method of claim 4, wherein: The mold is made of metal material, the inner wall has a shape and size corresponding to the strip beam, and the inner wall surface is coated with a layer of anti-sticking agent to facilitate the stripping of the strip beam blank body from the mold.

8. The method of claim 4, wherein: The step of defoaming treatment comprises the following steps: the stirred mud is placed in a vacuum defoaming machine, the vacuum degree is set to 0.08-0.1 MPa, the defoaming time is 15-30 minutes, and the water content of the defoamed mud is 25%-35%.

9. The method of claim 4, wherein: The high-temperature furnace is a tunnel furnace, and the temperature in the furnace is divided into a preheating zone, a sintering zone and a cooling zone. The temperature in the preheating zone is 300-600℃, the temperature in the sintering zone is 1200℃, and the temperature in the cooling zone is 600-200℃. The running speed of the strip beam blank body in the furnace is 0.5-1 m / min.

10. The method of claim 4, wherein: The finished support strip beam is a rectangular flat plate, and a plurality of grooves are arranged on the upper and lower surfaces of the finished support strip beam.

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