A sedimentation tank online high-efficiency trough withdrawal device and process

Abstract

The present invention discloses an online efficient trough withdrawal device for a sedimentation tank, comprising a separation sedimentation tank, a public sedimentation tank and N washing sedimentation tanks arranged in sequence, wherein the separation sedimentation tank, the public sedimentation tank and the N washing sedimentation tanks are all equipped with their own underflow pumps, and the separation sedimentation tank, the public sedimentation tank and the N washing sedimentation tanks are sequentially connected in series through their own underflow pumps and conveying pipelines; the public sedimentation tank and the N washing sedimentation tanks are all equipped with their own distribution boxes, which are arranged on the conveying pipeline at the outlet end of the underflow pump of the previous sedimentation tank, and the materials conveyed by the underflow pump or the previous distribution box are distributed to the next sedimentation tank or the next distribution box through the distribution box. The present invention can perform the trough withdrawal operation without stopping the production system, maintain the balance of liquid volume, and avoid the fluctuation of various indicators and the increase of production cost and cleaning cost.

Description

Technical Field

[0001] The invention relates to the technical field of alumina production, and in particular to an online high-efficiency settling tank withdrawal device and process. Background Art

[0002] In the process of producing alumina by the Bayer process, the separation, washing and refining of red mud and sodium aluminate solution is an important process step, which involves many tanks, especially the sedimentation process. In this process, the diluted slurry dissolved by high pressure is desiliconized at normal pressure in the post-dilute tank and then sent to the separation sedimentation tank for sedimentation separation. The bottom flow of the separation sedimentation tank is sent to multiple washing sedimentation tanks in turn by an underflow pump for multiple reverse washings to further recover the alumina and alkali therein. The bottom flow is transported backward in turn, and the overflow is transported forward in turn. Since the sedimentation tanks are connected in series, the bottom flow and overflow cannot be interrupted for a long time during normal operation. When the sedimentation tank is to be withdrawn and cleaned, the production system needs to be stopped for 5-7 days to complete, which not only leads to production interruption, but also makes it difficult to balance the system liquid volume and the index fluctuates greatly. In addition, due to the drop in temperature in the tank, the alumina in the slurry precipitates into the red mud, resulting in reduced production and increased production and cleaning costs. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an online efficient sedimentation tank withdrawal device and process, which can perform the withdrawal operation without stopping the production system, maintain liquid volume balance, avoid fluctuations in various indicators and increase in production costs and cleaning costs.

[0004] The technical solution adopted by the present invention is: to provide an online high-efficiency settling tank withdrawal device, comprising a separation settling tank, a public settling tank and N washing settling tanks arranged in sequence, wherein the separation settling tank and the public settling tank are provided with a feed pipeline for diluting the ore pulp, and the separation settling tank, the public settling tank and the N washing settling tanks are all equipped with their own underflow pumps, and the separation settling tank, the public settling tank and the N washing settling tanks are connected in series in sequence through their own underflow pumps and conveying pipelines; the public settling tank and the N washing settling tanks are all equipped with their own material distribution boxes, The distribution box is arranged on the delivery pipeline at the outlet end of the underflow pump of the previous sedimentation tank, and the materials delivered by the underflow pump or the previous distribution box are distributed to the next sedimentation tank or the next distribution box through the distribution box; the public sedimentation tank and the N washing sedimentation tanks are provided with a public red mud washing water pipe, and the red mud washing water pipe is connected with each sedimentation tank through the delivery pipeline, and the public sedimentation tank and the N washing sedimentation tanks are equipped with their own overflow pumps, the inlet of the overflow pump is connected with the sedimentation tank, and the outlet is connected with the red mud washing water pipe;

[0005] The trough withdrawal process of the sedimentation tank online high-efficiency trough withdrawal device is as follows:

[0006] A. During normal production, the public reserve sedimentation tank is used as a spare tank and is not activated. The qualified diluted slurry enters the separation sedimentation tank through the feed pipe for separation and sedimentation. The bottom flow of the separation sedimentation tank is transported by the bottom flow pump of the tank through the conveying pipe and the material distribution box to the first washing sedimentation tank. The bottom flow of the first washing sedimentation tank is transported by the bottom flow pump of the tank through the conveying pipe and the material distribution box to the second washing sedimentation tank, and so on until it is transported to the Nth washing sedimentation tank; the overflow of the Nth washing sedimentation tank is transported by the overflow pump of the tank through the conveying pipe to the N-1th washing sedimentation tank, and the overflow of the N-1th washing sedimentation tank is transported by the overflow pump of the tank through the conveying pipe to the N-2th washing sedimentation tank, and so on until it is transported to the first washing sedimentation tank;

[0007] B. When the separation sedimentation tank needs to be withdrawn, the public sedimentation tank is activated as the separation sedimentation tank, and the qualified diluted slurry enters the public sedimentation tank through the feed pipe for separation and sedimentation. The bottom flow of the public sedimentation tank is transported to the first washing sedimentation tank by the bottom flow pump of the tank through the conveying pipeline and the material distribution box. The bottom flow of the first washing sedimentation tank is sequentially transported to the Nth washing sedimentation tank according to step A, and the remaining materials of the separation sedimentation tank are transported to the public sedimentation tank by the bottom flow pump of the tank through the conveying pipeline and the red mud washing water pipe; the overflow of the Nth washing sedimentation tank is transported to the N-1th washing sedimentation tank by the overflow pump of the tank through the conveying pipeline and the red mud washing water pipe, and the overflow of the N-1th washing sedimentation tank is transported to the N-2th washing sedimentation tank by the overflow pump of the tank through the conveying pipeline and the red mud washing water pipe, and so on until it is transported to the first washing sedimentation tank;

[0008] C. When one of the washing and settling tanks needs to be withdrawn, the public settling tank is activated as the washing and settling tank, and the qualified diluted slurry enters the separation settling tank through the feed pipe for separation and settling. The bottom flow of the separation settling tank is pumped by the bottom flow pump of the tank through the conveying pipeline and the material distribution box to the public settling tank. The bottom flow of the public settling tank is pumped by the bottom flow pump of the tank through the conveying pipeline and the material distribution box to the next washing and settling tank, and so on until it is transported to the washing and settling tank before the withdrawal settling tank. The bottom flow of the washing and settling tank is pumped by the bottom flow pump of the tank through the conveying pipeline and the material distribution box to the next washing and settling tank. The material box is divided into materials and transported to the next washing sedimentation tank of the withdrawal sedimentation tank. The remaining materials in the withdrawal sedimentation tank are transported by the underflow pump of the tank through the conveying pipe and the material distribution box to the next washing sedimentation tank of the withdrawal sedimentation tank; the overflow of the last washing sedimentation tank is transported by the overflow pump of the tank through the conveying pipe and the red mud washing water pipe to the previous washing sedimentation tank, and so on until it is transported to the next washing sedimentation tank of the withdrawal sedimentation tank. The overflow of the washing sedimentation tank is transported by the overflow pump of the tank through the conveying pipe and the red mud washing water pipe to the previous washing sedimentation tank of the withdrawal sedimentation tank.

[0009] Preferably, two separation sedimentation tanks are provided, and the outlet of the underflow pump of the first separation sedimentation tank is connected to the distribution box on the outlet conveying pipeline of the underflow pump of the second separation sedimentation tank.

[0010] The online efficient trough withdrawal device and process of the sedimentation tank of the present invention changes the current series connection of the sedimentation tanks, can perform the trough withdrawal operation without stopping the production system, quickly withdraw the slurry in the sedimentation tank, and the liquid volume of the production system is stable, the indicators are stable, and the fluctuation of various indicators and the increase of production cost and cleaning cost are avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of the online high-efficiency trough withdrawal device of the sedimentation tank of the present invention.

[0012] In the figure, 1. separation sedimentation tank, 2. public sedimentation tank, 3. washing sedimentation tank, 4. underflow pump, 5. overflow pump, 6. material distribution box, 7. conveying pipeline, 8. red mud washing water pipe. DETAILED DESCRIPTION

[0013] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0014] like Figure 1 As shown, the present invention provides an online high-efficiency settling tank withdrawal device, comprising a separation settling tank, a public settling tank and N washing settling tanks arranged in sequence, the separation settling tank and the public settling tank are provided with a feed pipe for diluting the ore slurry, the feed pipe comprises a main pipe and branch pipes connected to the separation settling tank and the public settling tank, and control valves are provided on the main pipe and the branch pipes. The separation sedimentation tank, the public sedimentation tank and the N washing sedimentation tanks are all equipped with their own underflow pumps. The separation sedimentation tank, the public sedimentation tank and the N washing sedimentation tanks are connected in series in sequence through their own underflow pumps and conveying pipelines, that is, the underflow pump inlet is connected to the bottom of the previous sedimentation tank, and the outlet is connected to the top of the next sedimentation tank, and a control valve is arranged on the conveying pipeline; the public sedimentation tank and the N washing sedimentation tanks are all equipped with their own distribution boxes, which are arranged on the conveying pipeline at the outlet end of the underflow pump of the previous sedimentation tank, and the materials conveyed by the underflow pump or the previous distribution box are distributed to the next sedimentation tank or the next distribution box through the distribution box; the public sedimentation tank and the N washing sedimentation tanks are provided with a common red mud washing water pipe, which is connected to each sedimentation tank through a conveying pipeline, and the public sedimentation tank and the N washing sedimentation tanks are all equipped with their own overflow pumps, the inlet of the overflow pump is connected to the sedimentation tank, and the outlet is connected to the red mud washing water pipe.

[0015] In the specific implementation of the present invention, two separation sedimentation tanks are provided, and the outlet of the underflow pump of the first separation sedimentation tank is connected to the distribution box on the underflow pump outlet delivery pipeline of the second separation sedimentation tank. Four washing sedimentation tanks are provided, namely, two separation sedimentation tanks, one public sedimentation tank and four washing sedimentation tanks. Control valves are provided on the delivery pipeline and the red mud washing water pipe as required, such as closing the connection between the red mud washing water pipe and the sedimentation tank of the retreated sedimentation tank.

[0016] The trough withdrawal process of the sedimentation tank online high-efficiency trough withdrawal device is as follows:

[0017] A. During normal production, the public reserve sedimentation tank is used as a spare tank and is not activated. The qualified diluted slurry enters the separation sedimentation tank through the feed pipe for separation and sedimentation. The bottom flow of the first separation sedimentation tank is conveyed to the distribution box by the bottom flow pump of the tank through the conveying pipe, and the bottom flow of the second separation sedimentation tank is conveyed to the first washing sedimentation tank by the bottom flow pump of the tank through the conveying pipe and the distribution box. The bottom flows of the two separation sedimentation tanks are collected in the distribution box and then enter the first washing sedimentation tank. The bottom flow of the first washing sedimentation tank is conveyed to the second washing sedimentation tank by the bottom flow pump of the tank through the conveying pipe and the distribution box, and so on until it is conveyed to the fourth washing sedimentation tank; the overflow of the fourth washing sedimentation tank is conveyed to the third washing sedimentation tank by the overflow pump of the tank through the conveying pipe, and the overflow of the third washing sedimentation tank is conveyed to the second washing sedimentation tank by the overflow pump of the tank through the conveying pipe, and so on until it is conveyed to the first washing sedimentation tank;

[0018] B. When one separation sedimentation tank needs to be withdrawn and the other separation sedimentation tank is sufficient to process the material, the steps are as A. When it is not sufficient, the public sedimentation tank is activated as the second separation sedimentation tank, and the qualified diluted slurry enters the first separation sedimentation tank and the public sedimentation tank through the feed pipe for separation and sedimentation. The bottom flow of the public sedimentation tank is transported to the first washing sedimentation tank by the bottom flow pump of the tank through the conveying pipeline and the material distribution box. The bottom flow of the first washing sedimentation tank is transported to the fourth washing sedimentation tank in sequence according to step A. The remaining materials of the separation sedimentation tank are transported to the public sedimentation tank by the bottom flow pump of the tank through the conveying pipeline and the material distribution box; the overflow of the fourth washing sedimentation tank is transported to the third washing sedimentation tank by the overflow pump of the tank through the conveying pipeline and the red mud washing water pipe, and the overflow of the third washing sedimentation tank is transported to the second washing sedimentation tank by the overflow pump of the tank through the conveying pipeline and the red mud washing water pipe, and so on until it is transported to the first washing sedimentation tank;

[0019] C. When one of the washing and settling tanks needs to be withdrawn, the public settling tank is activated as the washing and settling tank, and the qualified diluted slurry enters the separation settling tank through the feed pipe for separation and settling. The bottom flow of the separation settling tank is pumped by the bottom flow pump of the tank through the conveying pipeline and the material distribution box to the public settling tank. The bottom flow of the public settling tank is pumped by the bottom flow pump of the tank through the conveying pipeline and the material distribution box to the next washing and settling tank, and so on until it is transported to the washing and settling tank before the withdrawal settling tank. The bottom flow of the washing and settling tank is pumped by the bottom flow pump of the tank through the conveying pipeline and the material distribution box to the next washing and settling tank. The material box is divided into materials and transported to the next washing sedimentation tank of the withdrawal sedimentation tank. The remaining materials in the withdrawal sedimentation tank are transported by the underflow pump of the tank through the conveying pipe and the material distribution box to the next washing sedimentation tank of the withdrawal sedimentation tank; the overflow of the last washing sedimentation tank is transported by the overflow pump of the tank through the conveying pipe and the red mud washing water pipe to the previous washing sedimentation tank, and so on until it is transported to the next washing sedimentation tank of the withdrawal sedimentation tank. The overflow of the washing sedimentation tank is transported by the overflow pump of the tank through the conveying pipe and the red mud washing water pipe to the previous washing sedimentation tank of the withdrawal sedimentation tank.

[0020] The above is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments, and cannot be understood as limiting the present invention. In the present invention, the connection relationship of the conveying pipelines of the bottom flow of each sedimentation tank is improved, and the overflow pipelines of each sedimentation tank are also improved accordingly. Based on the equivalence of the basic principles, they are not described in the present invention, but it does not mean that no corresponding modifications are made. For ordinary technicians in this field, it can be understood that various changes, modifications, replacements and modifications can be made to these embodiments without departing from the principles and spirit of the valve, and these modifications are all protected by the present invention.

Claims

1. A trough withdrawal process applied to an online high-efficiency trough withdrawal device for a sedimentation tank, comprising an online high-efficiency trough withdrawal device for a sedimentation tank, characterized in that: The settling tank online efficient tank withdrawal device comprises a separation settling tank, a public settling tank and N washing settling tanks which are arranged in sequence, wherein the separation settling tank and the public settling tank are provided with a feed pipeline for diluting the ore pulp, and the separation settling tank, the public settling tank and the N washing settling tanks are all equipped with their own underflow pumps, and the separation settling tank, the public settling tank and the N washing settling tanks are connected in series in sequence through their own underflow pumps and conveying pipelines; the public settling tank and the N washing settling tanks are all equipped with their own material distribution boxes, The distribution box is arranged on the delivery pipeline at the outlet end of the underflow pump of the previous sedimentation tank, and the materials delivered by the underflow pump or the previous distribution box are distributed to the next sedimentation tank or the next distribution box through the distribution box; the public sedimentation tank and the N washing sedimentation tanks are provided with a public red mud washing water pipe, and the red mud washing water pipe is connected with each sedimentation tank through the delivery pipeline, and the public sedimentation tank and the N washing sedimentation tanks are equipped with their own overflow pumps, the inlet of the overflow pump is connected with the sedimentation tank, and the outlet is connected with the red mud washing water pipe; The trough withdrawal process of the sedimentation tank online efficient trough withdrawal device is as follows: A. During normal production, the public reserve sedimentation tank is used as a spare tank and is not activated. The qualified diluted slurry enters the separation sedimentation tank through the feed pipe for separation and sedimentation. The bottom flow of the separation sedimentation tank is transported by the bottom flow pump of the tank through the conveying pipe and the material distribution box to the first washing sedimentation tank. The bottom flow of the first washing sedimentation tank is transported by the bottom flow pump of the tank through the conveying pipe and the material distribution box to the second washing sedimentation tank, and so on until it is transported to the Nth washing sedimentation tank; the overflow of the Nth washing sedimentation tank is transported by the overflow pump of the tank through the conveying pipe to the N-1th washing sedimentation tank, and the overflow of the N-1th washing sedimentation tank is transported by the overflow pump of the tank through the conveying pipe to the N-2th washing sedimentation tank, and so on until it is transported to the first washing sedimentation tank; B. When the separation sedimentation tank needs to be withdrawn, the public sedimentation tank is activated as the separation sedimentation tank, and the qualified diluted slurry enters the public sedimentation tank through the feed pipe for separation and sedimentation. The bottom flow of the public sedimentation tank is transported to the first washing sedimentation tank by the bottom flow pump of the tank through the conveying pipeline and the material distribution box. The bottom flow of the first washing sedimentation tank is sequentially transported to the Nth washing sedimentation tank according to step A, and the remaining materials of the separation sedimentation tank are transported to the public sedimentation tank by the bottom flow pump of the tank through the conveying pipeline and the red mud washing water pipe; the overflow of the Nth washing sedimentation tank is transported to the N-1th washing sedimentation tank by the overflow pump of the tank through the conveying pipeline and the red mud washing water pipe, and the overflow of the N-1th washing sedimentation tank is transported to the N-2th washing sedimentation tank by the overflow pump of the tank through the conveying pipeline and the red mud washing water pipe, and so on until it is transported to the first washing sedimentation tank; C. When one of the washing and settling tanks needs to be withdrawn, the public settling tank is activated as the washing and settling tank, and the qualified diluted slurry enters the separation settling tank through the feed pipe for separation and settling. The bottom flow of the separation settling tank is pumped by the bottom flow pump of the tank through the conveying pipeline and the material distribution box to the public settling tank. The bottom flow of the public settling tank is pumped by the bottom flow pump of the tank through the conveying pipeline and the material distribution box to the next washing and settling tank, and so on until it is transported to the washing and settling tank before the withdrawal settling tank. The bottom flow of the washing and settling tank is pumped by the bottom flow pump of the tank through the conveying pipeline and the material distribution box to the next washing and settling tank. The material box is divided into materials and transported to the next washing sedimentation tank of the withdrawal sedimentation tank. The remaining materials in the withdrawal sedimentation tank are transported by the underflow pump of the tank through the conveying pipe and the material distribution box to the next washing sedimentation tank of the withdrawal sedimentation tank; the overflow of the last washing sedimentation tank is transported by the overflow pump of the tank through the conveying pipe and the red mud washing water pipe to the previous washing sedimentation tank, and so on until it is transported to the next washing sedimentation tank of the withdrawal sedimentation tank. The overflow of the washing sedimentation tank is transported by the overflow pump of the tank through the conveying pipe and the red mud washing water pipe to the previous washing sedimentation tank of the withdrawal sedimentation tank.

2. The troughing process applied to the online high-efficiency troughing device of the sedimentation tank according to claim 1 is characterized in that: The separation sedimentation tanks are provided with two, and the outlet of the underflow pump of the first separation sedimentation tank is communicated with the distribution box on the underflow pump outlet conveying pipeline of the second separation sedimentation tank.

Images