Reaction tank for aluminum fluoride production

Abstract

The utility model discloses a reaction tank for aluminum fluoride production, which comprises a lower tank body, the top end of the lower tank body is provided with an upper tank body, the inner wall of the bottom of the lower tank body is fixedly provided with an annular support table, the top end of the annular support table is provided with a fluidized bed, and the top end of the fluidized bed is provided with first microporous filter cloth; a gas conveying pipe is installed at the center of the bottom end of the lower tank body, an annular gas pipe structure is arranged at the bottom of the lower tank body, and the annular gas pipe structure comprises an outer gas pipe, an inner gas pipe and a gas outlet hole. Through the annular air pipe structure and the fluidized bed, aluminum oxide powder suspends in hydrogen fluoride airflow to form a fluidized state, the aluminum oxide powder continuously rolls, caking is avoided, the heat and mass transfer efficiency is high, the contact area of hydrogen fluoride and the aluminum oxide powder is greatly increased, hardening of the aluminum oxide powder is prevented, and the porosity is kept; therefore, the reaction is more uniform and thorough, and the generation effect of aluminum fluoride is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of aluminium fluoride production technology, specifically is a kind of reaction tank for aluminium fluoride production. BACKGROUND

[0002] Aluminium fluoride (chemical formula AlF3) is an important inorganic compound, which has a wide range of applications in industry, especially in the field of aluminum smelting. As a flux, aluminium fluoride can significantly reduce the melting point of alumina and improve the electrical conductivity of electrolyte, thereby enhancing the production efficiency and quality of aluminum. In addition, in the ceramic industry, aluminium fluoride is used as a flux for ceramic glaze and enamel, which can improve the physical properties and appearance quality of ceramics, enhance the gloss and strength. In glass production, aluminium fluoride can reduce the melting temperature and improve the transparency and weather resistance of glass.

[0003] To produce aluminium fluoride from aluminium hydroxide and fluorosilicic acid, a reaction tank is needed. After heating, fluorosilicic acid decomposes to produce hydrogen fluoride (HF) gas. Alumina (Al2O3) is obtained by calcining aluminium hydroxide, which has a more stable structure and higher reaction efficiency. The generated hydrogen fluoride gas is introduced into the reaction tank containing alumina powder, and the two react to form aluminium fluoride. However, due to the accumulation of alumina powder at the bottom of the reaction tank and the uneven distribution of hydrogen fluoride gas, it is difficult for hydrogen fluoride gas to fully contact and uniformly react with alumina powder, which affects the generation of aluminium fluoride. Therefore, improvement is needed. SUMMARY

[0004] The utility model aims at providing a kind of reaction tank for aluminium fluoride production to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a kind of reaction tank for aluminium fluoride production, including lower tank body, the top of the lower tank body is provided with upper tank body, and the top of the upper tank body is installed with exhaust pipe, the inner wall on the bottom of the lower tank body is fixed with annular support table, and the top of the annular support table is provided with fluidized bed, and the top of the fluidized bed is installed with first microporous filter cloth, the central position of the bottom end of the lower tank body is installed with gas conveying pipe, and the bottom end of the gas conveying pipe is installed with gas inlet pipe, and the top end of the gas conveying pipe extends below the fluidized bed, the bottom of the lower tank body is provided with annular gas pipe structure, the annular gas pipe structure includes outer gas pipe, inner gas pipe, gas outlet hole, the outer gas pipe is installed at the bottom of the lower tank body, the inner gas pipe is installed at the inner side of the outer gas pipe, the gas outlet hole is equidistantly arranged at the top end of the outer gas pipe and the inner gas pipe, the first conduit is communicated between the outer gas pipe and the inner gas pipe, and the second conduit is communicated between the inner gas pipe and the gas conveying pipe.

[0006] Preferably, a sealing ring groove is arranged at the edge position of the top end of the lower tank body, a fluorine rubber sealing gasket is adhered at the edge position of the bottom end of the upper tank body, the fluorine rubber sealing gasket is tightly connected with the sealing ring groove, and the upper tank body is fixedly connected with the lower tank body through the fastening bolts.

[0007] Preferably, small vibration motors are installed at the two sides of the bottom end of the fluidized bed.

[0008] Preferably, a gas collecting cover is installed in the inside of the upper tank body, and a second microporous filter cloth is installed at the bottom end of the gas collecting cover.

[0009] Preferably, a gas collecting pipe is installed at the top end of the gas collecting cover, and a fluorine rubber sealing ring is adhered on the inner wall of the gas collecting pipe.

[0010] Preferably, a second valve is installed at the top of the exhaust pipe, and the bottom end of the exhaust pipe extends into the inside of the gas collecting pipe and tightly abuts against the fluorine rubber sealing ring.

[0011] Preferably, a circulating pump is installed on the outer wall of one side of the lower tank body, a first circulating pipe is installed at the input end of the circulating pump, one end of the first circulating pipe is connected with the exhaust pipe, and a first valve is installed at the connecting position of the first circulating pipe and the exhaust pipe.

[0012] Preferably, a second circulating pipe is installed at the output end of the circulating pump, one end of the second circulating pipe is communicated with the gas conveying pipe, and a one-way valve is installed at the connecting position of the second circulating pipe and the gas conveying pipe.

[0013] Compared with the prior art, the utility model has the advantages of:

[0014] The bottom of the lower tank body is provided with an annular gas pipe structure, the fluidized bed is arranged above the annular gas pipe structure, and the first microporous filter cloth is covered on the fluidized bed, the pore diameter of the first microporous filter cloth is smaller than the particle size of the alumina powder, secondly, the alumina powder produced by calcining the aluminum hydroxide is laid on the fluidized bed, then the upper tank body and the lower tank body are closed through the fastening bolts, the hydrogen fluoride gas generated by the decomposition of the fluorosilicic acid after heating is introduced into the gas conveying pipe through the air inlet pipe, the gas conveying pipe introduces the hydrogen fluoride gas into the inner gas pipe through the second conduit, the inner gas pipe introduces the hydrogen fluoride gas into the outer gas pipe through the first conduit, the hydrogen fluoride gas is uniformly discharged from the air outlet hole and passes through the fluidized bed to enter the alumina powder, the annular gas pipe structure makes the introduced hydrogen fluoride gas uniformly distributed, under the action of the airflow, the alumina powder is suspended in the hydrogen fluoride airflow to form a "fluidized state", the alumina powder continuously tumbles to avoid caking, the heat and mass transfer efficiency is high, the contact area of the hydrogen fluoride and the alumina powder is greatly increased, further, the small vibration motor applies low-frequency vibration to the fluidized bed to prevent the alumina powder from caking and maintain the porosity, so that the reaction is more uniform and complete, and the generation effect of the aluminum fluoride is improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the main view cross section structure schematic diagram of the utility model;

[0016] Figure 2 It is the annular air pipe structure planar enlarged structure schematic diagram of the utility model;

[0017] Figure 3 It is the upper jar body enlarged structure schematic diagram of the utility model;

[0018] Figure 4 It is the Figure 3 It is the A place enlarged structure schematic diagram of the utility model;

[0019] Figure 5 It is the gas collecting cover three-dimensional enlarged structure schematic diagram of the utility model.

[0020] In the drawing: 1, lower jar body; 101, small vibration motor; 2, annular support table; 3, fluidized bed; 4, first microporous filter cloth; 5, circulating pump; 6, first circulating pipe; 601, first valve; 7, upper jar body; 8, exhaust pipe; 801, second valve; 9, gas collecting cover; 10, sealing ring groove; 11, air inlet pipe; 12, gas conveying pipe; 13, annular air pipe structure; 1301, outer air pipe; 1302, inner air pipe; 1303, first guide pipe; 1304, second guide pipe; 1305, air outlet hole; 14, one-way valve; 15, second circulating pipe; 16, second microporous filter cloth; 17, fastening bolt; 18, fluorine rubber sealing gasket; 19, gas collecting pipe; 20, fluorine rubber sealing ring. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but only represents selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without making creative efforts fall within the scope of protection of the utility model.

[0022] The technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without making creative efforts fall within the scope of protection of the utility model.

[0023] Please refer to Figures 1-5The utility model provides an embodiment: a kind of reaction tank for aluminium fluoride production, upper tank body 7 is provided with the top of lower tank body 1, and the top of upper tank body 7 is equipped with exhaust pipe 8, and the inner wall on the bottom of lower tank body 1 is fixed with annular support platform 2, and the top of annular support platform 2 is provided with fluidized bed 3, and the top of fluidized bed 3 is equipped with first microporous filter cloth 4, and the central position of the bottom of lower tank body 1 is equipped with gas delivery pipe 12, and the bottom of gas delivery pipe 12 is equipped with air inlet pipe 11, and the top of gas delivery pipe 12 extends to the below of fluidized bed 3;

[0024] Specifically, annular gas pipe structure 13 is arranged at the bottom of lower tank body 1, fluidized bed 3 is arranged above annular gas pipe structure 13, and first microporous filter cloth 4 is covered on fluidized bed 3, and the pore size of first microporous filter cloth 4 is smaller than the particle size of alumina powder;

[0025] The bottom of lower tank body 1 is provided with annular gas pipe structure 13, annular gas pipe structure 13 includes outer gas pipe 1301, inner gas pipe 1302 and gas outlet hole 1305, outer gas pipe 1301 is installed at the bottom of lower tank body 1, inner gas pipe 1302 is installed at the inner side of outer gas pipe 1301, gas outlet hole 1305 is equidistantly arranged at the top of outer gas pipe 1301 and inner gas pipe 1302, outer gas pipe 1301 is communicated with inner gas pipe 1302 through equidistant first conduit 1303, and inner gas pipe 1302 is communicated with gas delivery pipe 12 through equidistant second conduit 1304;

[0026] Then, hydrogen fluoride gas generated by heating fluorosilicic acid is introduced into gas delivery pipe 12 through air inlet pipe 11, gas delivery pipe 12 introduces hydrogen fluoride gas into inner gas pipe 1302 through second conduit 1304, inner gas pipe 1302 introduces hydrogen fluoride gas into outer gas pipe 1301 through first conduit 1303, hydrogen fluoride gas is uniformly discharged from gas outlet hole 1305 and enters alumina powder through fluidized bed 3, the arrangement of annular gas pipe structure 13 makes the introduced hydrogen fluoride gas uniformly distributed, under the action of gas flow, alumina powder is suspended in hydrogen fluoride gas flow to form "fluidized state", alumina powder continuously tumbles to avoid caking, heat and mass transfer efficiency is high, the contact area of hydrogen fluoride and alumina powder is greatly increased, further, small vibration motor 101 applies low-frequency vibration to fluidized bed 3 to prevent alumina powder from caking and maintain porosity, so that the reaction is more uniform and complete, and the generation effect of aluminium fluoride is improved;

[0027] Sealing ring groove 10 is arranged at the edge position of the top of lower tank body 1, fluororubber gasket 18 is adhered at the edge position of the bottom of upper tank body 7, fluororubber gasket 18 is tightly clamped with sealing ring groove 10, and upper tank body 7 is fixedly connected with lower tank body 1 through fastening bolt 17;

[0028] Specifically, the aluminum oxide powder produced by calcining the aluminum hydroxide is laid on the fluidized bed 3, and the upper tank body 7 is closed with the lower tank body 1 by using the fastening bolt 17, and the fluorine rubber sealing gasket 18 at the bottom end of the upper tank body 7 is clamped into the sealing ring groove 10 at the top end of the lower tank body 1, so as to ensure the sealing between the lower tank body 1 and the upper tank body 7;

[0029] Small vibration motors 101 are installed at both sides of the bottom end of the fluidized bed 3;

[0030] The inside of the upper tank body 7 is installed with a gas collecting hood 9, and the bottom end of the gas collecting hood 9 is installed with a second microporous filter cloth 16; the top end of the gas collecting hood 9 is installed with a gas collecting pipe 19, and the inner wall of the gas collecting pipe 19 is adhered with a fluorine rubber sealing ring 20; the top of the exhaust pipe 8 is installed with a second valve 801, and the bottom end of the exhaust pipe 8 extends into the inside of the gas collecting pipe 19 and tightly fits with the fluorine rubber sealing ring 20;

[0031] A circulating pump 5 is installed on the outer wall of one side of the lower tank body 1, and the input end of the circulating pump 5 is installed with a first circulating pipe 6, one end of the first circulating pipe 6 is connected with the exhaust pipe 8, and the connecting part of the first circulating pipe 6 and the exhaust pipe 8 is installed with a first valve 601; the output end of the circulating pump 5 is installed with a second circulating pipe 15, one end of the second circulating pipe 15 is communicated with the gas conveying pipe 12, and the connecting part of the second circulating pipe 15 and the gas conveying pipe 12 is installed with a one-way valve 14;

[0032] Further, in the initial and middle stages of the reaction, the second valve 801 is closed, the first valve 601 is opened, the unreacted hydrogen fluoride gas enters the exhaust pipe 8 through the gas collecting hood 9, then enters the first circulating pipe 6, the circulating pump 5 is opened to convey the hydrogen fluoride gas from the second circulating pipe 15 to the gas conveying pipe 12, so that the unreacted hydrogen fluoride gas reenters the lower tank body 1 to participate in the reaction, thereby improving the utilization rate of the hydrogen fluoride gas and reducing the waste, and the second microporous filter cloth 16 at the bottom end of the gas collecting hood 9 can intercept the aluminum oxide powder, the pore size of the second microporous filter cloth 16 is smaller than the particle size of the aluminum oxide powder, so as to prevent the aluminum oxide powder from flowing out with the gas.

[0033] The embodiment of the application is used as follows: firstly, the annular air pipe structure 13 is arranged at the bottom of the lower tank body 1, the fluidized bed 3 is arranged above the annular air pipe structure 13, and the first microporous filter cloth 4 is covered on the fluidized bed 3, the pore size of the first microporous filter cloth 4 is smaller than the particle size of the alumina powder, secondly, the alumina powder produced by calcining the aluminum hydroxide is laid on the fluidized bed 3, then the upper tank body 7 is closed with the lower tank body 1 by using the fastening bolt 17, the fluorine rubber sealing gasket 18 at the bottom end of the upper tank body 7 is clamped into the sealing ring groove 10 at the top end of the lower tank body 1, so that the sealing between the lower tank body 1 and the upper tank body 7 is ensured, then the hydrogen fluoride gas generated by decomposing the fluorosilicic acid after heating is introduced into the gas conveying pipe 12 through the air inlet pipe 11, the gas conveying pipe 12 introduces the hydrogen fluoride gas into the inner air pipe 1302 through the second conduit 1304, the inner air pipe 1302 introduces the hydrogen fluoride gas into the outer air pipe 1301 through the first conduit 1303, the hydrogen fluoride gas is uniformly discharged from the air outlet hole 1305 and passes through the fluidized bed 3 into the alumina powder, the annular air pipe structure 13 makes the introduced hydrogen fluoride gas uniformly distributed, under the action of the airflow, the alumina powder is suspended in the hydrogen fluoride airflow to form a “fluidized state”, the alumina powder continuously tumbles to avoid caking, the heat and mass transfer efficiency is high, the contact area of the hydrogen fluoride and the alumina powder is greatly increased, further, the small vibration motor 101 applies low-frequency vibration to the fluidized bed 3 to prevent the alumina powder from caking and maintain the porosity, so that the reaction is more uniform and complete, thereby improving the generation effect of the aluminum fluoride, and in the initial and middle stages of the reaction, the second valve 801 is closed and the first valve 601 is opened, so that the unreacted hydrogen fluoride gas passes through the gas collecting hood 9 into the exhaust pipe 8, then into the first circulating pipe 6, the circulating pump 5 is opened to convey the hydrogen fluoride gas from the second circulating pipe 15 to the gas conveying pipe 12, so that the unreacted hydrogen fluoride gas reenters the lower tank body 1 to participate in the reaction, thereby improving the utilization rate of the hydrogen fluoride gas and reducing waste, the second microporous filter cloth 16 at the bottom end of the gas collecting hood 9 can intercept the alumina powder, the pore size of the second microporous filter cloth 16 is smaller than the particle size of the alumina powder, so that the alumina powder can be prevented from flowing out with the gas.

[0034] Obviously, the above-described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the protection scope of the present application.

Claims

1. A reaction tank for producing aluminum fluoride, comprising a lower tank body (1), a top end of the lower tank body (1) is provided with an upper tank body (7), and a top end of the upper tank body (7) is installed with an exhaust pipe (8), characterized in that, An annular support platform (2) is fixed on the inner wall of the bottom of the lower tank (1), and a fluidized bed (3) is provided at the top of the annular support platform (2). A first microporous filter cloth (4) is installed at the top of the fluidized bed (3). A gas supply pipe (12) is installed at the center of the bottom of the lower tank (1), and an air inlet pipe (11) is installed at the bottom of the gas supply pipe (12). The top of the gas supply pipe (12) extends to the bottom of the fluidized bed (3). An annular gas pipe structure (13) is provided at the bottom of the lower tank (1). The annular gas pipe structure (13) includes an outer gas pipe (1). 301), inner air pipe (1302), air outlet (1305), the outer air pipe (1301) is installed at the bottom of the lower tank (1), the inner air pipe (1302) is installed inside the outer air pipe (1301), the air outlet (1305) is evenly spaced at the top of the outer air pipe (1301) and the inner air pipe (1302), the outer air pipe (1301) and the inner air pipe (1302) are connected by an equally spaced first conduit (1303), and the inner air pipe (1302) is connected to the air supply pipe (12) by an equally spaced second conduit (1304).

2. The reaction kettle for producing aluminum fluoride according to claim 1, characterized in that: A sealing ring groove (10) is provided at the edge of the top of the lower tank (1), and a fluororubber sealing gasket (18) is adhered at the edge of the bottom of the upper tank (7). The fluororubber sealing gasket (18) is tightly engaged with the sealing ring groove (10), and the upper tank (7) and the lower tank (1) are fixedly connected by fastening bolts (17).

3. The reaction vessel for aluminum fluoride production according to claim 1, characterized in that: Small vibration motors (101) are installed on both sides of the bottom end of the fluidized bed (3).

4. The reaction vessel for aluminum fluoride production according to claim 1, characterized in that: The upper tank (7) is equipped with a gas collection hood (9), and a second microporous filter cloth (16) is installed at the bottom of the gas collection hood (9).

5. A reaction vessel for aluminum fluoride production according to claim 4, characterized in that: The top of the gas collection hood (9) is equipped with a gas collection pipe (19), and a fluororubber sealing ring (20) is adhered to the inner wall of the gas collection pipe (19).

6. A reaction vessel for producing aluminum fluoride according to claim 5, characterized in that: The exhaust pipe (8) is equipped with a second valve (801) at the top, and the bottom end of the exhaust pipe (8) extends into the interior of the gas collection pipe (19) and is tightly fitted with a fluororubber sealing ring (20).

7. A reaction vessel for producing aluminum fluoride according to claim 1, characterized in that: A circulation pump (5) is installed on the outer wall of one side of the lower tank (1), and a first circulation pipe (6) is installed at the input end of the circulation pump (5). One end of the first circulation pipe (6) is connected to the exhaust pipe (8), and a first valve (601) is installed at the connection between the first circulation pipe (6) and the exhaust pipe (8).

8. A reaction vessel for producing aluminum fluoride according to claim 7, characterized in that: The output end of the circulating pump (5) is equipped with a second circulating pipe (15), one end of which is connected to the gas supply pipe (12), and a one-way valve (14) is installed at the connection between the second circulating pipe (15) and the gas supply pipe (12).

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