Beneficiation wastewater advanced treatment and cyclic utilization system based on civil engineering structure

Abstract

The invention relates to the technical field of beneficiation, and discloses a beneficiation wastewater advanced treatment and cyclic utilization system based on a civil engineering structure, which comprises a primary treatment tank, a secondary treatment tank and a sedimentation tank which are sequentially reduced in height, beneficiation wastewater is introduced into the primary treatment tank, and the sedimentation tank supplies water to a beneficiation production link; the primary treatment tank is provided with a pH value coarse adjustment assembly, and the secondary treatment tank is provided with a pH value fine adjustment assembly; the PH value of water is roughly adjusted through the first-stage treatment pond, fine adjustment is conducted through the second-stage treatment pond, and the available standard is preliminarily achieved; then the water enters a sedimentation tank to further filter the residual part in the water; finally, the emission standard and the recycling standard are achieved; the complete beneficiation wastewater advanced treatment and cyclic utilization system is constructed, and the efficient and environment-friendly production requirements of beneficiation enterprises are met.

Description

Technical Field

[0001] The invention relates to the technical field of mineral processing, and in particular to a mineral processing wastewater deep treatment and recycling system based on a civil engineering structure. Background Art

[0002] At present, mineral processing wastewater treatment technology has certain limitations in terms of treatment efficiency, water resource reuse rate, and secondary pollution risk. For example: CN119390223A: "An automatic sulfuric acid adjustment system and control method for mineral processing wastewater treatment" applied by Yunnan Hualian Zinc and Indium Co., Ltd. This patent involves a control system for automatic sulfuric acid addition and pH value adjustment, including five modules: an external drainage pool, a pipe network component, a measurement component, a stirring component, and a controller. It can accurately control the amount of dilute sulfuric acid added, automatically monitor and adjust the pH value in the wastewater and the reserve amount of dilute sulfuric acid, avoid the danger of manual operation of sulfuric acid, and improve the safety and accuracy of the sulfuric acid adjustment link in the mineral processing wastewater treatment process, but it does not solve the problem of deep treatment and recycling of wastewater.

[0003] CN222239222U: "A tailings drainage treatment device for a ore dressing plant" of Luanping County Zhaofeng Mining Co., Ltd. belongs to the field of tailings drainage treatment. It can control the flow rate of mineral water in the sedimentation tank and achieve separation, but its function is single and it cannot achieve deep treatment and recycling of wastewater.

[0004] Long treatment cycle: Some treatment processes, such as biological treatment, require a certain amount of time for the growth and metabolism of microorganisms, resulting in a long overall wastewater treatment cycle, which is difficult to meet the needs of some companies for rapid wastewater treatment and reuse. For large-scale mineral processing companies, a large amount of wastewater is piled up waiting to be treated, which will affect production efficiency.

[0005] Greenhouse gas emissions: Some treatment processes, such as advanced oxidation technology, evaporation concentration and other processes, require a lot of energy and will produce a certain amount of greenhouse gas emissions. Summary of the invention

[0006] The purpose of the present invention is to solve at least one of the problems in the above-mentioned prior art and to provide a mineral processing wastewater deep treatment and recycling system based on civil engineering structure, which is used for civil engineering, water treatment and water recycling and is suitable for the treatment of mine wastewater containing heavy metals and unstable pH.

[0007] To achieve the above object, the present invention provides the following technical solutions: The deep treatment and recycling system of mineral processing wastewater based on civil engineering structure comprises a primary treatment tank, a secondary treatment tank and a sedimentation tank with successively decreasing heights; the primary treatment tank introduces mineral processing wastewater, and the sedimentation tank supplies water to the mineral processing production link; the primary treatment tank is provided with a pH value coarse adjustment component, and the secondary treatment tank is provided with a pH value fine adjustment component.

[0008] Furthermore, the pH value coarse adjustment component includes a first pH value detector and a first acid-base doser, and the pH value fine adjustment component includes a second pH value detector and a second acid-base doser, and the second pH value detector has a higher accuracy than the first pH value detector.

[0009] Furthermore, both the primary treatment tank and the secondary treatment tank are provided with agitators.

[0010] Furthermore, the secondary treatment tank is connected to the primary treatment tank and the sedimentation tank through pipelines; electric valves and flow regulating valves are installed on the pipelines.

[0011] Furthermore, a water reservoir is provided between the sedimentation tank and the mineral processing production link.

[0012] Furthermore, a flocculant additive is installed at the water source of the sedimentation tank; and a plurality of inclined plates which are parallel to each other and inclined are arranged in the sedimentation tank.

[0013] Furthermore, the cross section of the inclined plate is serrated; the upper end and the lower end of the inclined inclined plate are both serrated.

[0014] Furthermore, the lower sides of the corners at the lower end of the inclined plate are connected to mud drop pipes, the interior of the mud drop pipes is connected to the upper side of the lower end of the inclined plate; the lower ends of the mud drop pipes extend to the bottom of the sedimentation tank.

[0015] Furthermore, a baffle is provided at the lower end of the inclined plate, the baffle shields the lower end surface of the inclined plate and is connected to the mud drop pipe.

[0016] Furthermore, several layers of filter screens are arranged in the sedimentation tank, and the filter screens are located on the upper side of the inclined plate; and an overflow weir is arranged at the upper end of the sedimentation tank.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The present invention roughly adjusts the pH value of the water through the primary treatment tank, and finely adjusts it through the secondary treatment tank to initially reach the usable standard; then the residual part in the water is further filtered into the sedimentation tank; finally, the discharge standard and the recyclable standard are achieved; the present invention constructs a complete set of deep treatment and recycling system for mineral processing wastewater to meet the efficient and environmentally friendly production needs of mineral processing enterprises; The present invention optimizes sedimentation and sliding by means of an inclined plate with a serrated cross-section, cooperates with a baffle plate to collect and concentrate the sludge on the upper side of the inclined plate to fall, provides an independent mud path falling channel through a mud drop pipe, and directly transports the sludge to the bottom of the sedimentation tank, so that the waterway and the mud path are isolated and run separately with less mutual interference; since the sludge collection and falling is promoted, the mud drop pipe design of the present invention has less impact on the waterway, occupies less space, and has less impact on the size of the sedimentation tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the present invention.

[0019] Figure 2 It is a schematic diagram of the internal three-dimensional structure of the sedimentation tank of the present invention.

[0020] Figure 3 It is a schematic diagram of the internal side structure of the sedimentation tank of the present invention.

[0021] Figure 4 It is a schematic diagram of the three-dimensional structure of the inclined plate and the mud drop pipe from the first perspective of the present invention.

[0022] Figure 5 It is a schematic diagram of the three-dimensional structure of the inclined plate and the mud drop pipe from the second viewing angle of the present invention.

[0023] Figure 6 It is a schematic diagram of the three-dimensional structure of the inclined plate and the mud drop pipe from the third perspective of the present invention.

[0024] Figure 7 It is a schematic diagram of the top view of the inclined plate and the mud drop pipe of the present invention.

[0025] In the figure: 1. primary treatment tank; 2. secondary treatment tank; 3. sedimentation tank; 4. first pH detector; 5. first acid-base doser; 6. second pH detector; 7. second acid-base doser; 8. agitator; 9. water reservoir; 10. electric valve; 11. flow regulating valve; 12. flocculant adder; 13. filter screen; 14. overflow weir; 15. inclined plate; 16. mud drop pipe; 17. baffle; 18. falling channel. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, rather than all the embodiments.

[0027] Specific embodiments of the system for deep treatment and recycling of mineral processing wastewater based on civil engineering structure provided by the present invention: See also Figure 1-7 The deep treatment and recycling system of mineral processing wastewater based on civil engineering structure includes a primary treatment tank 1, a secondary treatment tank 2 and a sedimentation tank 3 with decreasing heights.

[0028] Civil structure design: By precisely adjusting the elevation of the treatment pool, based on the principle of natural flow of water, the wastewater can flow freely between different treatment pools, reduce the use of power equipment in the wastewater treatment process, and reduce energy consumption. For example, the elevation of the primary treatment pool 1 is higher than that of the secondary treatment pool 2, and the elevation of the secondary treatment pool 2 is higher than that of the sedimentation pool 3, so that the wastewater can flow naturally into the subsequent treatment pools in turn. At the same time, ensure that the flow path of the wastewater in the pool is reasonable to improve the treatment effect.

[0029] Adjust the treatment pool elevation through civil engineering structure to achieve wastewater self-flow and efficient sedimentation, reduce energy consumption in the treatment process and improve treatment efficiency. Rationally arrange water treatment and water circulation equipment through civil engineering structure to ensure that each treatment link is closely connected and improve the overall treatment effect.

[0030] In some embodiments, under the premise that the strength and corrosion resistance requirements are met, the civil structure material of the treatment pool can be replaced by a new type of corrosion-resistant composite material, such as fiber reinforced plastic (FRP), which has the advantages of light weight, easy construction, strong corrosion resistance, etc., and can shorten the construction period and reduce maintenance costs.

[0031] A water reservoir 9 is provided between the sedimentation tank 3 and the mineral processing production link; the water reservoir 9 is used to temporarily store the treated recyclable clean water. In this embodiment, the water reservoir 9 is located at the output end of the sedimentation tank 3, and the height of the water reservoir 9 is lower than the sedimentation tank 3. In some other embodiments, the water reservoir 9 can be provided in the mineral processing production link, and the clean water output from the sedimentation tank 3 is pumped into the water reservoir 9 of the mineral processing production link by a water pump for use in the mineral processing production.

[0032] The secondary treatment tank 2 is connected to the primary treatment tank 1 and the sedimentation tank 3 through pipelines; electric valves 10 and flow regulating valves 11 are installed on the pipelines; the electric valve 10 can be opened and closed electrically. When wastewater treatment is carried out, the electric valve 10 is opened and the flow regulating valve 11 can control and adjust the flow rate of the pipeline water to ensure the balance of wastewater flow.

[0033] In this embodiment, the purified water output end of the sedimentation tank 3 is connected to the water storage tank 9 via a pipeline, and an electric valve 10 which can be opened and closed electrically is also provided on the pipeline.

[0034] The primary treatment tank 1 introduces wastewater generated by mineral processing production through a water pump, and the water treated in the sedimentation tank 3 is supplied to the water inlet end of the mineral processing production link through the water reservoir 9.

[0035] The primary treatment tank 1 is provided with a pH value coarse adjustment component, and the secondary treatment tank 2 is provided with a pH value fine adjustment component. The pH value coarse adjustment component includes a first pH value detector 4 and a first acid-base doser 5, and the pH value fine adjustment component includes a second pH value detector 6 and a second acid-base doser 7. The second pH value detector 6 has a higher accuracy than the first pH value detector 4.

[0036] The first acid-base doser 5 and the second acid-base doser 7 both include an acid solution tank and an alkaline solution tank, the lower sides of the acid solution tank and the alkaline solution tank are both connected to a dosing pipe for dosing to the treatment pool, a flow meter and an electromagnetic valve are installed on the dosing pipe, and the flow rate of the electromagnetic valve is adjustable. The flow meter accuracy of the second acid-base doser 7 is higher than that of the first acid-base doser 5.

[0037] The beneficiation wastewater first flows into the primary treatment tank 1, and an appropriate amount of acid or alkali regulator is added through the first acid-base doser 5 to quickly and roughly adjust the pH value in the water to make it close to the neutral range. The wastewater after the preliminary pH adjustment naturally flows into the secondary treatment tank 2 by gravity. In the secondary treatment tank 2, the water quality is monitored in real time by the high-precision second pH value detector 6. According to the monitoring results, the fine-tuning acid or alkali regulator is accurately added to fine-tune the water quality so that the water quality initially reaches the usable standard.

[0038] Wastewater acid-base adjustment method (taking wastewater acidity as an example): if the first pH value detector 4 detects that the pH value of the wastewater is D, which is acidic, the first acid-base doser 5 adds alkaline solution for neutralization, and the alkaline solution addition rate is Vml / s; the addition rate V changes with the change of D; The second pH detector 6 collects the pH value every five minutes. When the detection results are acidic for three consecutive times (the detection start time is a period of time S after the pH value of the wastewater detected by the first pH detector 4 is D, and the period of time S is the time required for the wastewater to flow from the inlet end of the primary treatment tank 1 to the inlet end of the secondary treatment tank 2), the addition speed of the alkaline solution added by the first acid-base doser 5 is adjusted to (V+v)Vml / s; v is a fixed value; The second acid-base doser 7 adds alkaline solution to neutralize the wastewater in the secondary treatment tank 2 .

[0039] Correspondingly, the first acid-base doser 5 selects an acidic solution or an alkaline solution to neutralize the wastewater according to the result of the first pH detector 4; the second acid-base doser 7 selects an acidic solution or an alkaline solution to neutralize the wastewater according to the result of the second pH detector 6. The addition speed of the second acid-base doser 7 changes with the result of the second pH detector 6, and the detection value and the addition speed are more accurate, which compensates for the primary treatment result and improves the effect of the acid-base treatment structure. Through the two-stage acid-base treatment tank, the wastewater is made close to neutral, and the speed of adding solution is adjusted in real time, which can respond to the pH value changes of the wastewater source, quickly realize dynamic adjustment, and keep the output wastewater close to neutral.

[0040] In some other embodiments, as an alternative, in addition to using traditional acid-base agents, microbial agents can be used to adjust the pH in the pH adjustment process. Microorganisms can use organic matter or specific inorganic substances in wastewater for metabolic activities, thereby changing the pH value of wastewater. This method is more environmentally friendly and will not introduce new chemical pollutants.

[0041] In this embodiment, in order to better mix the acid and alkali solutions with the wastewater, a stirrer 8 is provided in both the primary treatment tank 1 and the secondary treatment tank 2. The stirrer 8 includes a motor installed on the upper side of the treatment tank and a stirring blade extending into the wastewater of the treatment device. The motor drives the stirring blade to rotate, thereby promoting full contact and mixing between the regulator and the wastewater and improving the treatment effect.

[0042] A flocculant adder 12 is installed at the water source of the sedimentation tank 3, that is, the water inlet of the sedimentation tank 3; the flocculant adder 12 stably adds flocculant to the wastewater entering the sedimentation tank 3, and the flocculant enters the wastewater to promote the precipitation of impurities in the wastewater.

[0043] A plurality of inclined plates 15 parallel to each other are arranged in the sedimentation tank 3. The inclined plates 15 are connected to the inner side of the upper part of the sedimentation tank 3. The inclined plates 15 are shaped in a special style to increase the sedimentation area and improve the sedimentation efficiency.

[0044] Specifically, in this embodiment, the cross section of the inclined plate 15 is sawtooth-shaped; the upper end and the lower end of the inclined inclined plate 15 are both sawtooth-shaped. Compared with the traditional flat plate with an inclined surface, the sawtooth inclined plate 15 increases the sedimentation area, thereby improving the sedimentation efficiency.

[0045] In the traditional sedimentation tank 3 inclined plate 15, a certain amount of sludge accumulates on the upper side of the inclined plate 15 and slides down under the action of gravity, then passes through the lower water body of the sedimentation tank 3 and falls into the V-shaped groove in the sedimentation tank 3. The sludge in the V-shaped groove is discharged regularly. Wastewater enters from the upper side of the sedimentation tank 3, first moves down into the lower part of the sedimentation tank 3, and evenly passes through the inclined plate 15 from the lower part of the sedimentation tank 3 and moves upward. When the sludge falls through the lower water body of the sedimentation tank 3, it interferes with the flowing water, that is, the waterway and the mudway interfere with each other. The flowing water will disperse part of the falling sludge, and the sludge will be remixed in the water, flow upward with the water, and then settle on the inclined plate 15 again. In this way, part of the sludge circulates and settles and falls on the inclined plate 15, resulting in repeated sedimentation, which limits the improvement of sedimentation efficiency; in the process of continuous sedimentation treatment, the amount of impurities in the wastewater increases, the density of impurities increases, and then a large number of impurities cannot be precipitated, and the output water of the sedimentation tank 3 is turbid. The main cause of this problem is the lack of an independent mud falling channel.

[0046] In the prior art, the water channel of the lateral flow inverted V-plate flows horizontally, and the inverted V-plate is set horizontally, which can also be used for impurities to settle. However, since the side coverage area of ​​the inverted V-plate is large, setting a mud falling channel on the side of the inverted V-plate occupies a lot of space, and under the condition of the same processing capacity, the construction area and volume of the sedimentation tank 3 will be significantly increased.

[0047] The sawtooth inclined plate 15 in this embodiment has another advantage. When the inclined plate 15 has the same inclination angle as a whole, the upper side of the inclined plate 15 in this embodiment has multiple surfaces. The inclination angle of each surface on the upper side of the inclined plate 15 is larger than that on the side of the traditional flat plate, which is more conducive to the falling of the sludge. The double lifting of area lifting and smooth falling of the sludge is achieved.

[0048] In addition, the lower end of the inclined plate 15 has two corners. The lower corner, that is, the lower corner, forms a collecting effect on the sludge. Providing an independent sludge falling channel here will greatly reduce the volume of the sludge falling channel and improve the lateral space occupancy, so there is no need to increase the volume of the sedimentation tank 3.

[0049] The lower side of the corner of the lower end of the inclined plate 15 near the lower layer is connected to the mud pipe 16, and the interior of the mud pipe 16 is connected to the upper side of the lower end of the inclined plate 15; the lower end of the mud pipe 16 extends to the V-shaped groove at the bottom of the sedimentation tank 3. A baffle 17 is provided at the lower end of the inclined plate 15, which blocks the end surface of the lower end of the inclined plate 15 and is connected to the mud pipe 16, and the mud pipe 16 is connected to the upper side of the baffle 17. The baffle 17 blocks the sludge sliding down from the upper side of the inclined plate 15 to prevent it from directly entering the water body, but makes it fall from the mud pipe 16.

[0050] An independent falling channel 18 for sludge to fall is formed in the sludge drop pipe 16, which directly transports the sludge to the bottom of the sedimentation tank 3. The falling sludge does not interfere with the wastewater to be precipitated outside, which completely avoids the problem of sludge re-mixing with water and re-circulating sedimentation; it significantly improves the sedimentation efficiency, improves the sedimentation effect, and improves the effluent quality.

[0051] Several layers of filter screens 13 are arranged in the sedimentation tank 3, and the filter screens 13 are located on the upper side of the inclined plate 15; the filter screens 13 filter the residual parts in the water, such as fine suspended matter, colloids and some dissolved pollutants, and finally make the treated water meet the discharge standard and recyclable standard.

[0052] In some other embodiments, the multi-layer filter screen 13 can be replaced by a membrane filter device, such as an ultrafiltration membrane or a reverse osmosis membrane. Membrane filtration technology has a higher filtration accuracy and can more effectively remove tiny particles, colloids and soluble substances in wastewater, further improving the water quality of the treated water.

[0053] An overflow weir 14 is provided at the upper end of the sedimentation tank 3 , and the overflow weir 14 is higher than the filter screen 13 . The treated water overflows from the overflow weir 14 , and the water overflowing from the overflow weir 14 enters the water storage tank 9 through a pipeline.

[0054] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments without creative work, or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. The deep treatment and recycling system of mineral processing wastewater based on civil engineering structure is characterized by: The invention comprises a primary treatment tank (1), a secondary treatment tank (2) and a sedimentation tank (3) of which the heights are successively reduced; the primary treatment tank (1) introduces ore dressing wastewater, and the sedimentation tank (3) supplies water to the ore dressing production link; the primary treatment tank (1) is provided with a pH value coarse adjustment component, and the secondary treatment tank (2) is provided with a pH value fine adjustment component.

2. The system for deep treatment and recycling of mineral processing wastewater based on civil engineering structure according to claim 1 is characterized in that: The pH value coarse adjustment component comprises a first pH value detector (4) and a first acid-base doser (5), and the pH value fine adjustment component comprises a second pH value detector (6) and a second acid-base doser (7), wherein the second pH value detector (6) has a higher accuracy than the first pH value detector (4).

3. The system for deep treatment and recycling of mineral processing wastewater based on civil engineering structure according to claim 1 or 2, characterized in that: The primary treatment tank (1) and the secondary treatment tank (2) are both provided with a stirrer (8).

4. The system for deep treatment and recycling of mineral processing wastewater based on civil engineering structure according to claim 1 is characterized in that: The secondary treatment tank (2) is connected to the primary treatment tank (1) and the sedimentation tank (3) via pipelines; electric valves (10) and flow regulating valves (11) are installed on the pipelines.

5. The system for deep treatment and recycling of mineral processing wastewater based on civil engineering structure according to claim 1 is characterized in that: A water reservoir (9) is provided between the sedimentation tank (3) and the mineral processing production link.

6. The system for deep treatment and recycling of mineral processing wastewater based on civil engineering structure according to claim 1 is characterized in that: A flocculant adder (12) is installed at the water source of the sedimentation tank (3); a plurality of inclined plates (15) which are parallel to each other and arranged obliquely are provided in the sedimentation tank (3).

7. The system for deep treatment and recycling of mineral processing wastewater based on civil engineering structure according to claim 6 is characterized in that: The cross section of the inclined plate (15) is sawtooth-shaped; the upper end and the lower end of the inclined inclined plate (15) are both sawtooth-shaped.

8. The system for deep treatment and recycling of mineral processing wastewater based on civil engineering structure according to claim 7 is characterized in that: The lower sides of the corners of the lower ends of the inclined plates (15) are connected to the mud drop pipes (16), and the interior of the mud drop pipes (16) is in communication with the upper sides of the lower ends of the inclined plates (15); the lower ends of the mud drop pipes (16) extend to the bottom of the sedimentation tank (3).

9. The system for deep treatment and recycling of mineral processing wastewater based on civil engineering structure according to claim 8 is characterized in that: A baffle (17) is provided at the lower end of the inclined plate (15); the baffle (17) shields the lower end surface of the inclined plate (15) and is connected to the mud drop pipe (16).

10. The system for deep treatment and recycling of mineral processing wastewater based on civil engineering structure according to any one of claims 6 to 9, characterized in that: A plurality of layers of filter screens (13) are provided in the sedimentation tank (3), and the filter screens (13) are located on the upper side of the inclined plate (15); an overflow weir (14) is provided at the upper end of the sedimentation tank (3).

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