Rain and sewage diversion drainage and pollution discharge system for aluminum oxide plant
By adopting underground buried pipes and bypass pipes in the alumina plant, rainwater and sewage are separated, solving the problem of mixed use of rainwater and sewage, and improving the water system balance and environmental protection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-22
- Publication Date
- 2026-04-03
AI Technical Summary
In the drainage system of alumina plants, the mixing of rainwater and sewage leads to an imbalance in the water system, increases evaporation energy consumption, and may pollute the environment, making it difficult to achieve effective separation of rainwater and sewage.
Underground pipes are used as sewage pipes, and sewage equipment is connected through bypass pipes to accurately discharge slurry containing alkaline solution into underground sewage tanks. At the same time, rainwater is organized to be discharged into the rainwater collection network through drainage ditches and collection wells to prevent rainwater from entering the sewage tanks.
This achieved separation of rainwater and sewage, reduced energy consumption from water evaporation, maintained the balance of the plant's water system, reduced the difficulty of ground construction, and reduced the risk of environmental pollution.
Smart Images
Figure CN121781672A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a rainwater and sewage separation drainage and sewage system for an alumina plant, belonging to the field of drainage and sewage technology for alumina plants. Background Technology
[0002] In alumina production, taking the Bayer process as an example, the process from bauxite to alumina powder involves multiple steps, including leaching, red mud sedimentation and washing, decomposition and classification, and evaporation. In the leaching, red mud sedimentation and washing, and decomposition and classification processes, a large amount of alkaline liquid slurry, specifically sodium hydroxide solution, is transported in the tanks and pipelines. The concentration of this alkaline substance varies from 5% to 50% (depending on the process flow). This mixture is called recyclable mother liquor. Because the mother liquor is corrosive and recyclable, protective measures are needed around the site to prevent liquid spillage in the event of production or accidental tank explosions. These measures include dikes ranging from 400mm to 1200mm (calculated to be determined). The site flooring should be alkali-resistant. Additionally, collection ditches should be installed to collect the mother liquor released during production and spilled during cleanup, ultimately discharging it into a wastewater tank. Pipes connected to the wastewater tank lead to the production tank for recycling of the collected slurry. Figure 5 As shown, dikes are erected outside the tanks and equipment. The areas enclosed by these sections are typically large, reaching hundreds of meters in length and tens of meters in width. Previously, sewage ditches and site drainage ditches were used interchangeably, resulting in large amounts of rainwater being collected in the sewage tanks and entering the production system during rainfall. This severely affected the overall water system balance and significantly increased the energy consumption and load of the evaporation section. Some plants have installed rainwater collection outlets, discharging rainwater from the sewage ditches into the rainwater pipe network during rainfall. This resulted in alkaline liquids entering the rainwater system, polluting the environment and increasing the difficulty of rainwater recycling. Summary of the Invention
[0003] The purpose of this invention is to provide a rainwater and sewage separation drainage system for alumina plants, which accurately discharges slurry containing alkaline solution into underground sewage tanks, preventing rainwater from entering the sewage tanks and facilitating daily maintenance and management.
[0004] The technical solution of the present invention:
[0005] A rainwater and sewage separation drainage system for an alumina plant includes a dike, drainage ditches on both sides inside the dike, an underground sewage pipe inside the dike, a bypass pipe that rises above ground level at each discharge point of the underground sewage pipe, a maintenance valve at the top of the bypass pipe, and the underground sewage pipe is connected to an underground sewage tank.
[0006] The bypass pipe is connected to each sewage discharge device via a pipe opening on its side.
[0007] The height of the inspection valve is 200-300 mm.
[0008] The underground sewage pipe is made of high molecular weight polyethylene slurry pipe.
[0009] The drainage ditch is connected to the water collection well.
[0010] The water collection well is connected to the emergency pipe network via an emergency pipe and to the rainwater pipe network via a rainwater pipe.
[0011] Valves are installed on the accident pipeline and the rainwater pipeline.
[0012] The technical solution of this invention uses underground buried pipes as sewage pipes, and connects each piece of equipment that needs sewage discharge through bypass pipes. The slurry containing alkaline solution is accurately discharged into the underground sewage pipes, which eventually discharge into underground sewage tanks. On the ground, according to different process configurations, rainwater on the ground is organized and discharged into rainwater collection wells and then into the rainwater collection network through drainage ditches. This not only reduces the energy consumption of water evaporation in the system and maintains the balance of the entire plant's water system, but also reduces the difficulty of ground construction. There are no sewage ditches on the ground, only drainage ditches on both sides, avoiding the disadvantages of previous ground drainage difficulties, the need to meet the slope of the process configuration, the great difficulty of ground slope finding, and water accumulation on the site. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the planar layout of the present invention.
[0014] Figure 2 This is an enlarged schematic diagram of the water collection well of the present invention.
[0015] Figure 3 This is an enlarged schematic diagram of the bypass pipe and underground sewage pipe of the present invention.
[0016] Figure 4 yes Figure 3 Side view.
[0017] Figure 5 This is a schematic diagram of the layout of existing alumina plant equipment and cofferdams. Detailed Implementation
[0018] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.
[0019] Example 1
[0020] See Figure 1-4As shown, the present invention provides a rainwater and sewage separation drainage system for an alumina plant, including a dike 1, drainage ditches 2 on both sides inside the dike 1, an underground sewage pipe 3 inside the dike 1, a bypass pipe 4 raised above the ground at each location where material needs to be discharged from the underground sewage pipe 3, a maintenance valve 5 at the top of the bypass pipe 4, and the underground sewage pipe 3 connected to an underground sewage tank 6.
[0021] The bypass pipe 4 is connected to each sewage discharge device through a pipe opening on one side.
[0022] The height of the maintenance valve 5 is 200-300 mm.
[0023] The underground sewage pipe 3 is made of high molecular weight polyethylene slurry pipe. This pipe is wear-resistant, impact-resistant, acid and alkali resistant, has a high operating temperature range, good self-lubricating properties, low friction coefficient, is not prone to scaling, and facilitates slurry flow and pipe flushing.
[0024] like Figure 1 and 2 As shown, the drainage ditch 2 is connected to the collection well 7. Water is discharged into the collection well 7 in an organized manner through the drainage ditch 2, and finally enters the rainwater collection pipe network. The collection well 7 is provided with a maintenance well on the outer side of the cofferdam 1.
[0025] The water collection well 7 is connected to the emergency pipe network via the emergency pipe 8 and to the rainwater pipe network via the rainwater pipe 9.
[0026] Valves are installed on the accident pipe 8 and the rainwater pipe 9. In the event of a burst pipe accident, the valve on the rainwater pipe 9 should be closed and the valve on the accident pipe 8 should be opened.
[0027] Example 2
[0028] The present invention discloses a rainwater and sewage separation drainage system for an alumina plant, comprising a dike 1, drainage ditches 2 on both sides inside the dike 1, an underground sewage pipe 3 inside the dike 1, a bypass pipe 4 raised above ground at each location where material needs to be discharged from the underground sewage pipe 3, a maintenance valve 5 at the top of the bypass pipe 4, and the underground sewage pipe 3 connected to an underground sewage tank 6.
[0029] The bypass pipe 4 is connected to each sewage discharge device through a pipe opening on one side.
[0030] The height of the maintenance valve 5 is 250 mm.
[0031] The underground sewage pipe 3 is made of stainless steel or reinforced concrete.
[0032] In addition to the preferred embodiments described above, the present invention has other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection claimed by the present invention.
Claims
1. A rainwater and sewage separation drainage system for an alumina plant, comprising a dike (1), and drainage ditches (2) provided on both sides inside the dike (1), characterized in that: An underground sewage pipe (3) is installed inside the cofferdam (1). A bypass pipe (4) is installed above ground at each location where material needs to be discharged. A maintenance valve (5) is installed at the top of the bypass pipe (4). The underground sewage pipe (3) is connected to the underground sewage tank (6).
2. The alumina plant rainwater and sewage separation drainage system according to claim 1, characterized in that: The bypass pipe (4) is connected to each sewage discharge device through a pipe opening on its side.
3. The alumina plant rainwater and sewage separation drainage system according to claim 1, characterized in that: The height of the maintenance valve (5) is 200-300 mm.
4. The alumina plant rainwater and sewage separation drainage system according to claim 1, characterized in that: The underground sewage pipe (3) is made of high molecular weight polyethylene slurry pipe.
5. The alumina plant rainwater and sewage separation drainage system according to claim 1, characterized in that: The drainage ditch (2) is connected to the water collection well (7).
6. The alumina plant rainwater and sewage separation drainage system according to claim 5, characterized in that: The water collection well (7) is connected to the emergency pipe network through the emergency pipe (8) and to the rainwater pipe network through the rainwater pipe (9).
7. The rainwater and sewage separation drainage system for an alumina plant according to claim 6, characterized in that: Valves are installed on the accident pipe (8) and the rainwater pipe (9).