CN110090477B

CN110090477B - Deep cone settling tank feeding device

Info

Publication number: CN110090477B
Application number: CN201810093354.3A
Authority: CN
Inventors: 齐川; 李志国; 陈国华; 唐时健
Original assignee: Shenyang Aluminum and Magnesium Engineering and Research Institute Co Ltd
Current assignee: Shenyang Aluminum and Magnesium Engineering and Research Institute Co Ltd
Priority date: 2018-01-31
Filing date: 2018-01-31
Publication date: 2021-09-10
Anticipated expiration: 2038-01-31
Also published as: CN110090477A

Abstract

The invention relates to a feeding device of a deep cone settling tank for producing aluminum oxide by a Bayer process. The utility model provides an overflow pipe is connected with mixing chamber and diffusion chamber in proper order on the deep cone subsider, is equipped with the venturi mouth between mixing chamber and the diffusion chamber, and the diffusion chamber discharge end is connected with the subsider inlet pipe, is equipped with compressed air import pipe on the mixing chamber. The advantages and effects of this hair: according to the invention, the feeding flow and the solid content fluctuation of the settling tank are fully considered, bubbles generated by compressed air can play a role of uniformly mixing slurry through the feeding device for adjusting the feeding flow by changing the air flow, the mixing efficiency of the settling tank is greatly improved, the settling tank can be used as a static mixer, and meanwhile, the settling tank overflows into the feeding device main body by utilizing the height difference of the discharging and feeding port, so that the energy consumption is saved. The flow of the diluent can be adjusted along with the fluctuation of the feeding, the optimized feeding system can ensure the sufficient mixing of the slurry, and the mixing efficiency of the slurry after the sufficient mixing can be obviously improved.

Description

Deep cone settling tank feeding device

Technical Field

The invention relates to a feeding device of a settling tank, in particular to a feeding device of a deep cone settling tank for producing aluminum oxide by a Bayer process.

Background

The settling, separating and washing of red mud is one of the important processes in the production process of alumina by Bayer process, the diluted slurry after digestion by Bayer process is the mixture of sodium aluminate solution and red mud, and the sodium aluminate solution and the red mud with high solid content can be separated into pure sodium aluminate solution and red mud with high solid content by red mud settling. The deep cone settling tank has higher feeding concentration, and the supernatant of the settling tank needs to be diluted again to achieve better settling effect. Because the inhaled supernatant volume of traditional deep cone subsider venturi inlet pipe can't be controlled, when the feeding velocity of flow and solid content change, hardly reach better dilution effect, lead to subsiding the effect poor, cause serious influence to production.

Disclosure of Invention

The invention provides a feeding device of a deep cone settling tank, aiming at solving the problem of poor dilution effect caused by deep cone settling feeding fluctuation.

In order to achieve the purpose, the invention provides a feeding device of a deep cone settling tank, wherein an overflow pipe on the deep cone settling tank is sequentially connected with a mixing chamber and a diffusion chamber, a Venturi port is arranged between the mixing chamber and the diffusion chamber, the discharge end of the diffusion chamber is connected with a feeding pipe of the settling tank, and a compressed air inlet pipe is arranged on the mixing chamber.

The diffusion chamber, the compressed air inlet pipe and the mixing chamber are seamless steel pipes, and the Venturi port is a reducing port.

Compressed air enters the mixing chamber in the direction of slurry flow.

The compressed air inlet pipe is inserted into the mixing chamber, and an elbow is arranged at the position of the insertion port and faces to the flow direction of the slurry.

The diameters of the two ends of the Venturi port are the same as those of the mixing chamber and the diffusion chamber, and the diameter of the middle part of the Venturi port is smaller than those of the two ends of the Venturi port.

The venturi port, the diffusion chamber and the mixing chamber are welded together, and the height of the welding line is equal to the thickness of a thin part in two adjacent welding parts.

The advantages and effects of this hair: the invention fully considers the feeding flow and the solid content fluctuation of the settling tank, and the air flow is changed to adjust the feeding device of the feeding flow, so that the bubbles generated by compressed air can play a role of uniformly mixing slurry, thereby greatly improving the mixing efficiency of the settling tank, being used as a static mixer, simultaneously utilizing the height difference of the discharging and feeding port, leading the settling tank to overflow and automatically flow into the feeding device main body, and saving the energy consumption. The flow of the diluent can be adjusted along with the fluctuation of the feeding, the optimized feeding system can ensure the sufficient mixing of the slurry, and the mixing efficiency of the slurry after the sufficient mixing can be obviously improved.

Drawings

Fig. 1 is a schematic elevation view of the present invention.

Fig. 2 is a schematic plan view of the present invention.

In the figure: 1. a diffusion chamber; 2. a venturi opening; 3. a mixing chamber; 4. a compressed air inlet pipe; 5. an overflow pipe; 6. a settling tank feed pipe; 7. deep cone settling tank.

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings.

As shown in the figure, the overflow pipe 5 on the deep cone settling tank 7 of the feeding device of the deep cone settling tank is sequentially connected with the mixing chamber 3 and the diffusion chamber 1, the venturi port 2 is arranged between the mixing chamber 3 and the diffusion chamber 1, the discharge end of the diffusion chamber 1 is connected with the feeding pipe 6 of the settling tank, and the mixing chamber 3 is provided with the compressed air inlet pipe 4.

The diffusion chamber 1, the compressed air inlet pipe 4 and the mixing chamber 3 are seamless steel pipes, and the Venturi port 2 is a reducing port.

The compressed air enters the mixing chamber 3 in the direction of the slurry flow.

The compressed air inlet pipe 4 is inserted into the mixing chamber 3, and an elbow is arranged at the insertion opening and faces to the flow direction of the slurry.

The diameters of the two ends of the Venturi port 2 are the same as those of the mixing chamber 3 and the diffusion chamber 1, and the diameter of the middle part of the Venturi port 2 is smaller than those of the two ends of the Venturi port 2.

The venturi opening 2, the diffusion chamber 1 and the mixing chamber 3 are welded together, and the height of the welding line is the thickness of a thin part in two adjacent welding parts. The diffusion chamber is connected with the settling tank feeding pipe 6, slurry passing through the venturi port is sent into the settling tank, the venturi port 2 is a reducing port, the effect of the venturi port is that the pressure on the side of the diffusion chamber 1 is reduced by changing the flow speed of the slurry passing through the venturi pipe, and the slurry is pushed to flow towards the settling tank feeding pipe 6. Compressed air introduced from a compressed air inlet pipe 4 is mixed with overflow from an overflow pipe 5 in a mixing chamber 3 and then enters a Venturi port 2, the density of the overflow is reduced, the density of slurry in the mixing chamber is lower than that of slurry overflowing from a settling tank, pressure difference is generated, the slurry flows to a diffusion chamber 1 favorably, and meanwhile, the slurry with bubbles can be fully mixed with other slurry (such as settling underflow) when entering a feeding pipe 6 of the settling tank, so that the mixing efficiency is improved, and the washing is facilitated. When the slurry flow and solid content of the feeding pipe 6 of the settling tank fluctuate, the feeding quantity of compressed air can be adjusted, the flow from the overflow of the settling tank is changed, and the concentration of the slurry entering the settling tank is ensured to reach the standard. The feed pipe of the settling tank is used for collecting all the materials which need to enter the settling tank and entering the settling tank together with the overflow from the diffusion chamber 1.

Claims

1. The utility model provides a deep cone subsider feed arrangement, its characterized in that overflow pipe on the deep cone subsider is connected with mixing chamber and diffusion chamber in proper order, is equipped with the venturi mouth between mixing chamber and the diffusion chamber, and the diffusion chamber discharge end is connected with the subsider inlet pipe, is equipped with compressed air import pipe on the mixing chamber.

2. The deep cone settler feeding device according to claim 1, wherein the diffusion chamber, the compressed air inlet pipe and the mixing chamber are seamless steel pipes, and the venturi opening is a variable diameter opening.

3. The deep cone settler feed arrangement according to claim 1, characterized in that compressed air enters the mixing chamber in the direction of slurry flow.

4. The deep cone settler feeding device according to claim 3, characterized in that the compressed air inlet pipe is inserted into the mixing chamber and provided with a bend at the insertion opening, the bend facing the slurry flow direction.

5. The deep cone settler feeding device of claim 2, wherein the diameters of the two ends of the venturi opening are the same as the diameters of the mixing chamber and the diffusion chamber, and the diameter of the middle part of the venturi opening is smaller than the diameters of the two ends of the venturi opening.

6. The deep cone settler feed arrangement according to claim 1, wherein the venturi opening is welded to the diffusion and mixing chambers at a height corresponding to the thickness of the thin member of the two adjacent welded members.