Foam recovery system and recovery method

Abstract

The foam recovery system comprises a decomposition tank, a material passing centrifugal fan, a foam collector, a connecting pipe, a Venturi pipe and a high-pressure centrifugal fan, a collecting pipeline is connected between the decomposition tank and the side wall of the foam collector, and the material passing centrifugal fan is installed on the collecting pipeline; the bottom of the foam collector is connected with the decomposing tank through an outer pipe, one end of the connecting pipe extends into the foam collector, the other end of the connecting pipe is communicated with the throat portion of the Venturi pipe, the inlet end of the Venturi pipe is connected with an outlet pipe of the high-pressure centrifugal fan, and the outlet end of the Venturi pipe is communicated with the collecting device. And the foam in the foam collector is blown out to the collecting device by the high-pressure centrifugal fan. According to the foam recycling device, foam can be smashed, blown away and recycled, the use amount of a defoaming agent is reduced, the cost is effectively reduced, and the application range is wide.

Description

Technical Field

[0001] The present invention relates to the technical field of foam recovery, and in particular to a foam recovery system and a recovery method. Background Art

[0002] As an important equipment in the alumina industry, the decomposition tank is mainly used to decompose the sodium aluminate solution and then decompose aluminum hydroxide. In the actual production process, the thickness of the foam on the liquid surface of the decomposition tank of most alumina manufacturers is between 10cm and 200cm. In severe cases, defoamers need to be added to eliminate the foam, and the eliminated foam returns to the process, which is a temporary solution but not a fundamental solution. In addition, the price of one ton of defoamers is between 12,000 and 20,000 yuan. A row of decomposition tanks needs to add 10-15 tons of defoamers per month, which is expensive to deal with foam and has high costs. Summary of the invention

[0003] The purpose of the present invention is to provide a foam recovery system and a foam recovery method to solve the above problems existing in the prior art.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A foam recovery system of the present invention comprises a decomposition tank, a centrifugal fan for feeding, a foam collector, a connecting pipe, a venturi tube and a high-pressure centrifugal fan. A collecting pipe is connected between the decomposition tank and the side wall of the foam collector. The centrifugal fan for feeding is installed on the collecting pipe to pump the foam in the decomposition tank into the foam collector. The bottom of the foam collector is connected to the decomposition tank through an external pipe. One end of the connecting pipe extends into the foam collector, and the other end is connected to the throat of the venturi tube. The inlet end of the venturi tube is connected to the outlet pipe of the high-pressure centrifugal fan, and the outlet end of the venturi tube is connected to the collecting device so that the foam in the foam collector is blown out to the collecting device by the high-pressure centrifugal fan.

[0006] Furthermore, an adjusting pipe is connected between the decomposition tank and the side wall of the foam collector, and the connection between the adjusting pipe and the side wall of the foam collector is higher than the connection between the collecting pipe and the side wall of the foam collector.

[0007] Furthermore, the collecting device is a storage yard.

[0008] Furthermore, the collecting device comprises a mixing tank, a centrifugal pump and a mother liquid tank, hot water and a defoaming agent are added into the mixing tank, and the liquid outlet of the mixing tank is connected to the mother liquid tank through the centrifugal pump.

[0009] Furthermore, a stirrer is provided in the mixing tank.

[0010] Furthermore, the centrifugal fan for feeding is installed on the top of the decomposition tank.

[0011] Furthermore, the aluminum hydroxide solution in the decomposition tank has an alkali concentration of 140-180 g / L, a solid content of 550-900 g / L, and a temperature of 45-80°C.

[0012] The present invention also provides a foam recovery method, which uses the foam recovery system and includes the following steps: the foam in the decomposition tank is pumped into a foam collector by a centrifugal fan, the centrifugal fan crushes part of the foam during the pumping process, and the foam sinks by gravity in the foam collector, wherein the liquid flows into the decomposition tank through an outer pipe, the foam is transported to the throat of the Venturi tube through a connecting pipe, the high-pressure airflow of the high-pressure centrifugal fan enters the Venturi tube and generates negative pressure at the throat of the Venturi tube, and under the suction effect of the negative pressure, the foam enters the Venturi tube and is blown out to the collection device.

[0013] Furthermore, the blown foam is stored in the yard and treated as hazardous waste.

[0014] Furthermore, the blown foam is sent to a mixing tank, and hot water and a defoaming agent are added for stirring, and the stirred mixture is sent to a mother liquid tank through a centrifugal pump.

[0015] Compared with the prior art, the beneficial technical effects of the present invention are:

[0016] The foam recovery system and recovery method of the present invention can process the foam by physical equipment by arranging a decomposition tank, a material passing centrifugal fan, a foam collector, a venturi tube and a high-pressure centrifugal fan, and can crush, blow away and recover the foam. It not only saves time and effort, but also reduces the use of defoaming agents, effectively reduces costs, and avoids environmental pollution that may be caused by chemical agents. It has a wide range of applications and good application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a structural schematic diagram of the foam recovery system of the present invention.

[0019] Explanation of the accompanying reference numerals: 1. decomposition tank; 2. centrifugal fan for material transfer; 21. collection pipe; 3. foam collector; 31. outer pipe; 32. regulating pipe; 4. venturi tube; 41. connecting pipe; 5. high-pressure centrifugal fan; 6. storage yard; 7. mixing tank; 71. agitator; 72. centrifugal pump; 73. mother liquor tank; 8. hot water and defoaming agent. DETAILED DESCRIPTION

[0020] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0021] In the description of the present invention, it should be understood that the terms "length", "width", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] The technical solutions provided by various embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0024] Example 1

[0025] like Figure 1As shown, the foam recovery system of this embodiment 1 includes a decomposition tank 1, a feed centrifugal fan 2, a foam collector 3, a connecting pipe 41, a venturi tube 4 and a high-pressure centrifugal fan 5, wherein a collecting pipe 21 is connected between the decomposition tank 1 and the side wall of the foam collector 3, and the feed centrifugal fan 2 is installed on the collecting pipe 21. At this time, a negative pressure is formed between the decomposition tank 1 and the foam collector 3 by the feed centrifugal fan 2, and the foam in the decomposition tank 1 can be pumped into the foam collector 3. Preferably, the feed centrifugal fan 2 is installed on the top of the decomposition tank 1, and the bottom of the foam collector 3 is connected to the decomposition tank 1 through an outer pipe 31 One end of the connecting pipe 41 extends into the foam collector 3, and the other end is connected to the throat of the venturi tube 4. The inlet end of the venturi tube 4 is connected to the outlet pipe of the high-pressure centrifugal fan 5, and the outlet end of the venturi tube 4 is connected to the collecting device, so that the foam in the foam collector 3 is blown out to the collecting device by the high-pressure centrifugal fan 5. At this time, the high-pressure airflow provided by the high-pressure centrifugal fan 5 enters through the inlet end of the venturi tube 4, and the flow velocity increases and the static pressure decreases when passing through the throat, forming a negative pressure area. The negative pressure area can attract the foam in the foam collector 3 and blow the foam out to the collecting device through the outlet end of the venturi tube 4.

[0026] In this embodiment 1, the foam generated in the decomposition tank 1 can be efficiently collected into the foam collector 3 through the pumping action of the centrifugal fan 2. At the same time, by utilizing the Venturi effect, the foam can be blown out and collected without increasing additional energy consumption through the high-pressure airflow provided by the high-pressure centrifugal fan 5 and the special design of the Venturi tube 4, thereby improving the energy efficiency of the system. By connecting the foam collection, blowing and collection devices together, a complete foam recovery process is formed, which simplifies the operating steps and improves work efficiency.

[0027] Among them, a regulating pipe 32 is also connected between the decomposition tank 1 and the side wall of the foam collector 3. The connection between the regulating pipe 32 and the side wall of the foam collector 3 is higher than the connection between the collecting pipe 21 and the side wall of the foam collector 3. With this arrangement, the foam level in the foam collector 3 can be adjusted when necessary. When the foam level in the foam collector 3 is too high, part of the foam can be released through the regulating pipe 32 to maintain the stable operation of the system. At the same time, the regulating pipe 32 can also serve as a release channel for the foam pressure in the foam collector 3 to prevent pressure accumulation due to excessive foam.

[0028] Optionally, the collecting device may be a storage yard 6, in which the blown foam is stored and treated as hazardous waste; or, the collecting device includes a mixing tank 7, a centrifugal pump 72 and a mother liquid tank 73, in which hot water and a defoaming agent 8 are added, and a stirrer 71 is provided in the mixing tank 7, and the liquid outlet of the mixing tank 7 is connected to the mother liquid tank 73 through the centrifugal pump 72, the blown foam is sent to the mixing tank 7, and hot water and a defoaming agent 8 are added for stirring, and the stirred mixture is sent to the mother liquid tank 73 through the centrifugal pump 72, which can effectively reduce the difficulty and cost of environmental protection treatment of the foam and realize the recycling of resources; or, as Figure 1 As shown, the foam recovery system of this embodiment 1 is connected to the storage yard 6 and the mixing tank 7 at the same time, and corresponding selection can be made according to specific usage requirements. For example, when the amount of foam generated is large, part of the foam can be sent to the mixing tank 7 for treatment first, and the remaining part can be sent to the storage yard 6 for storage, or the ratio of the two treatment methods can be flexibly adjusted according to the nature of the foam and the treatment requirements.

[0029] Specifically, the alkali concentration of the aluminum hydroxide solution in the decomposition tank 1 is 140-180 g / L, and this concentration range ensures the stability and efficiency of the aluminum hydroxide solution during the decomposition process; the solid content is 550-900 g / L, and the temperature is 45-80° C., which is conducive to the subsequent treatment and recovery of the foam.

[0030] When the foam recovery system of this embodiment 1 is in use, the foam in the decomposition tank 1 is pumped into the foam collector 3 through the suction of the centrifugal fan 2. At this time, the interior of the pumped foam part is a water ball, and part of the aluminum hydroxide solution is wrapped inside the water ball. The outside of the water ball is pure foam. The pumped foam is partially crushed under the action of the centrifugal fan 2 and enters the foam collector 3, and can sink by gravity in the foam collector 3. The liquid flows into the decomposition tank 1 through the outer tube 31, and the pure foam is transported to the throat of the venturi tube 4 through the connecting tube 41. The high-pressure airflow of the high-pressure centrifugal fan 5 enters the venturi tube 4 and generates negative pressure at the throat of the venturi tube 4. Under the suction action of the negative pressure, the foam enters the venturi tube 4 and is blown out to the collection device. Through the cooperation of the high-pressure centrifugal fan 5 and the venturi tube 4, the foam in the decomposition tank 1 can be recovered, which saves time and effort, and has a large air volume. During the blowing process, the foam can be completely blown away. There are two ways to deal with the blown foam. On the one hand, it can be blown to the storage yard 6 for storage and treated as hazardous waste; on the other hand, it can be blown into the mixing tank 7, and after adding hot water and defoaming agent 8 to eliminate the foam, it is sent to the mother liquor tank 73 through the centrifugal pump 72.

[0031] The foam recovery system of the present embodiment 1 does not require additional energy consumption during the entire recovery process, and reduces environmental pollution through effective foam recovery and treatment, which complies with the concept of energy conservation and environmental protection.

[0032] It should be noted that the foam recovery system of this embodiment 1 is not limited to the alumina industry, but can also be widely used in other industrial fields that require foam treatment, such as chemical industry, food, environmental protection, etc. It has a wide range of applications and good application prospects.

[0033] Example 2

[0034] The foam recovery method of the present embodiment 2 adopts the above-mentioned foam recovery system and includes the following steps: the foam in the decomposition tank 1 is pumped into the foam collector 3 by the centrifugal fan 2; during the pumping process, the centrifugal fan 2 crushes part of the foam, which is helpful for subsequent gravity settling and liquid separation; the foam is gravity-settled in the foam collector 3, wherein the liquid flows into the decomposition tank 1 through the outer tube 31, thereby achieving a preliminary separation of the liquid and the foam; the foam is transported to the throat of the venturi tube 4 through the connecting tube 41; the high-pressure airflow of the high-pressure centrifugal fan 5 enters the venturi tube 4 and generates negative pressure at the throat of the venturi tube 4; under the suction effect of the negative pressure, the foam enters the venturi tube 4 and is blown out to the collection device.

[0035] Optionally, the blown foam is stored in the yard 6 and treated as hazardous waste; or, the blown foam is sent to the mixing tank 7, and hot water and defoaming agent 8 are added for stirring, and the stirred mixture is sent to the mother liquid tank 73 through the centrifugal pump 72.

[0036] The foam recovery system and recovery method of the present invention can rely on physical equipment to process foam by setting a decomposition tank, a material passing centrifugal fan, a foam collector, a venturi tube and a high-pressure centrifugal fan, and can crush and blow away the foam and recover the foam, which not only saves time and labor, but also reduces the use of defoaming agents, effectively reduces costs, has a wide range of applications, and has good application prospects.

[0037] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A foam recovery system, characterized in that: It includes a decomposition tank, a centrifugal fan for passing materials, a foam collector, a connecting pipe, a venturi tube and a high-pressure centrifugal fan. A collecting pipe is connected between the decomposition tank and the side wall of the foam collector. The centrifugal fan for passing materials is installed on the collecting pipe to pump the foam in the decomposition tank into the foam collector. The bottom of the foam collector is connected to the decomposition tank through an external pipe. One end of the connecting pipe extends into the foam collector, and the other end is connected to the throat of the venturi tube. The inlet end of the venturi tube is connected to the outlet pipe of the high-pressure centrifugal fan, and the outlet end of the venturi tube is connected to the collecting device, so that the foam in the foam collector is blown out to the collecting device by the high-pressure centrifugal fan.

2. A foam recovery system according to claim 1, characterized in that: An adjusting pipe is also connected between the decomposition tank and the side wall of the foam collector, and the connection between the adjusting pipe and the side wall of the foam collector is higher than the connection between the collection pipe and the side wall of the foam collector.

3. A foam recovery system according to claim 1, characterized in that: The collecting device is a storage yard.

4. A foam recovery system according to claim 1, characterized in that: The collecting device comprises a mixing tank, a centrifugal pump and a mother liquid tank. Hot water and a defoaming agent are added into the mixing tank. The liquid outlet of the mixing tank is connected to the mother liquid tank through the centrifugal pump.

5. A foam recovery system according to claim 4, characterized in that: A stirrer is arranged in the mixing tank.

6. A foam recovery system according to claim 1, characterized in that: The centrifugal fan for feeding is installed on the top of the decomposition tank.

7. A foam recovery system according to any one of claims 1 to 6, characterized in that: The aluminum hydroxide solution in the decomposition tank has an alkali concentration of 140-180 g / L, a solid content of 550-900 g / L, and a temperature of 45-80°C.

8. A foam recovery method, characterized in that: The foam recovery system according to any one of claims 1 to 7 comprises the following steps: The foam in the decomposition tank is pumped into the foam collector by the centrifugal fan. During the pumping process, the centrifugal fan crushes part of the foam, and the foam sinks by gravity in the foam collector. The liquid flows into the decomposition tank through the outer pipe, and the foam is transported to the throat of the Venturi tube through the connecting pipe. The high-pressure airflow of the high-pressure centrifugal fan enters the Venturi tube and generates negative pressure at the throat of the Venturi tube. Under the suction effect of the negative pressure, the foam enters the Venturi tube and is blown out to the collection device.

9. A foam recovery method according to claim 8, characterized in that: The blown foam is stored in the yard and treated as hazardous waste.

10. A foam recovery method according to claim 8, characterized in that: The blown foam is sent to a mixing tank, and hot water and a defoaming agent are added for stirring. The stirred mixture is sent to a mother liquid tank through a centrifugal pump.

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