Automatic treatment system for kaolin deironing and whitening acid water

Abstract

The utility model provides an automatic treatment system for kaolin deironing and whitening acid water. The automatic treatment system comprises a gravity sedimentation recovery tank, a pH regulating tank, an aeration tank, a horizontal flow sedimentation tank, a mechanical acceleration clarification tank and a clean water tank, a water inlet input pipe is arranged on the gravity settling recovery tank, the upper part of the gravity settling recovery tank is connected with the pH regulating tank, the pH regulating tank is connected with the alkali liquor adding tank, the bottom of the pH regulating tank is connected with the aeration tank, the bottom of the aeration tank is connected with the horizontal flow sedimentation tank, and the upper part of the horizontal flow sedimentation tank is connected with the mechanical acceleration clarification tank; and the mechanical acceleration clarification tank is connected with the PAC solution storage tank and the PAM solution storage tank. The automatic treatment system disclosed by the utility model has the beneficial effects that residual kaolin in acid water is recovered through gravity settling, the vast majority of kaolin can be recovered, and the treatment capacity of a subsequent water treatment system and the dosage of a flocculating agent can be effectively reduced, so that the operation cost of water treatment is reduced; the system has a remarkable treatment effect, and is provided with a water quality on-line monitor, so that the treatment time is effectively shortened.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically an automated treatment system for acidic water containing iron removal and whitening from kaolin. Background Technology

[0002] The kaolin beneficiation process generates a large amount of iron-removing and whitening acid water, mainly because the natural whiteness of kaolin generally does not meet the requirements for papermaking and requires whitening treatment. Kaolin is whitened using a combined process of magnetic separation and chemical bleaching. In the chemical bleaching process, ferric ions are reduced to ferrous ions under acidic conditions. After bleaching, residual SO3 remains in the pulp. 2- SO4 2- In subsequent production processes, a large amount of iron-removing and whitening acidic water is generated, with a pH value between 2 and 3. It contains acid radicals, ferrous ions, and a certain amount of kaolin, etc. After water treatment, it meets the discharge standards.

[0003] The current process for treating acidic water for iron removal and whitening of kaolin is "lime neutralization - oxidation aeration - flocculation sedimentation". However, because the acidic water for iron removal and whitening contains a certain amount of fine kaolinite suspended matter, there are problems such as a large amount of sediment in the aeration tank, easy blockage of the aeration pipe, and high consumption of flocculant, which leads to increased labor costs and expenses.

[0004] Chinese patent document CN209835831U describes a kaolin processing wastewater sedimentation treatment device. It neutralizes the kaolin iron removal and whitening acidic wastewater, then allows it to settle to obtain a supernatant. This supernatant is injected into a pH adjustment flocculation tank, followed by the introduction of untreated kaolin acidic wastewater to adjust the pH of the separated supernatant. Oxygen aeration is then performed, and finally, a flocculant is added for flocculation, thereby removing iron from the acidic water. However, this system does not utilize the kaolin contained in the wastewater for resource recovery, and adjusting the pH of the untreated kaolin acidic wastewater increases the subsequent system's processing capacity. Chinese patent document CN217230415U describes a kaolin acidic wastewater treatment system. This system removes oil and large particle residues carried by the machinery from the kaolin acidic wastewater through an oil separator and a grit chamber, then sequentially passes it through a reaction tank, a sedimentation tank, and a clear water tank. This efficiently and rapidly reduces the total salt content of the kaolin acidic wastewater, obtaining water that can be reused in production. The reaction tank is equipped with activated carbon and CaO feeders. However, the activated carbon in this system contains ash, which can easily cause secondary pollution. Furthermore, activated carbon is only suitable for lightly polluted water and cannot handle sudden situations. The saturation point of the adsorbent is difficult to determine, and the adsorbent capacity is limited. Dry addition of CaO can easily lead to uneven reactions and incomplete neutralization of some wastewater. Therefore, there is a need to develop an automated, simple-constructed, and highly efficient iron removal and whitening acidic water treatment technology system that recovers and reuses kaolin from the acidic water, while simultaneously reducing the amount of flocculant needed for subsequent water treatment and achieving compliant discharge. Utility Model Content

[0005] In view of this, the present invention provides an automated treatment system for acidic water with iron removal and whitening of kaolin, including a gravity sedimentation recovery tank, a pH adjustment tank, an aeration tank, a horizontal flow sedimentation tank, a mechanically accelerated clarification tank, a clear water tank, and a sludge tank.

[0006] The gravity sedimentation recovery tank is equipped with an inlet pipe, and the upper part of the gravity sedimentation recovery tank is connected to the pH adjustment tank through a first connecting pipe. The bottom of the gravity sedimentation recovery tank is lower than the bottom of the adjustment tank.

[0007] The bottom of the pH adjustment tank is connected to the aeration tank, and the bottom of the pH adjustment tank is higher than the bottom of the aeration tank. An alkali addition tank is provided above the adjustment tank.

[0008] The bottom of the aeration tank is connected to the horizontal flow sedimentation tank, and the bottom of the aeration tank is higher than the bottom of the horizontal flow sedimentation tank;

[0009] The upper part of the horizontal sedimentation tank is connected to the mechanically accelerated clarification tank, and the mechanically accelerated clarification tank is connected to the PAC solution storage tank and the PAM solution storage tank.

[0010] The upper part of the mechanically accelerated clarification tank is connected to the clear water tank, and the clear water tank is provided with a discharge outlet;

[0011] The bottom of the horizontal sedimentation tank and the bottom of the mechanically accelerated clarification tank are both connected to the sludge tank through sludge discharge pipes.

[0012] Furthermore, an integrated magnetic coagulation device is provided between the mechanically accelerated clarification tank and the clear water tank. The upper part of the mechanically accelerated clarification tank is connected to the integrated magnetic coagulation device through a second connecting pipe, the upper part of the integrated magnetic coagulation device is connected to the clear water tank through a third connecting pipe, and the bottom of the integrated magnetic coagulation device is connected to the sludge tank through a sludge discharge pipe.

[0013] Furthermore, a water quality monitoring instrument is installed in the clear water tank, and a discharge valve is installed in the discharge outlet. The water quality monitoring instrument is connected to the discharge valve, and a controller is installed in the water quality monitoring instrument. The controller is used to monitor the water quality in the clear water tank and control the discharge valve.

[0014] Furthermore, it also includes a blower aeration assembly, which includes an air diffuser, an aeration pipe, and an aeration pump. The air diffuser is located inside the aeration tank, and the aeration pump is connected to the air diffuser through the aeration pipe.

[0015] Furthermore, the alkali addition tank is filled with a saturated quicklime aqueous solution, and the alkali addition tank is connected to the bottom of the pH adjustment tank via an alkali addition pipe.

[0016] Furthermore, the mechanically accelerated clarification tank is equipped with a mechanical stirrer.

[0017] Furthermore, a pH meter probe is installed inside the conditioning tank.

[0018] Furthermore, water pumps are installed on the first connecting pipe, the second connecting pipe, and the third connecting pipe.

[0019] Furthermore, the PAC solution storage tank and the PAM solution storage tank are also connected to the integrated magnetic coagulation device.

[0020] Furthermore, the bottom of the gravity sedimentation recovery tank is also equipped with a sludge removal device.

[0021] The beneficial effects of this utility model's automated treatment system for iron removal and whitening acidic wastewater from kaolin are as follows:

[0022] (1) The automated treatment system recovers the residual kaolin in the acid water by gravity sedimentation. It can recover most of the kaolin and effectively reduce the amount of water treatment and flocculant used in the subsequent water treatment system, thereby reducing the water treatment operating cost.

[0023] (2) The sludge tank of the automated treatment system is connected to the horizontal sedimentation tank and the mechanically accelerated clarification tank through the sludge discharge pipe. The sediment in the horizontal sedimentation tank and the mechanically accelerated clarification tank can be directly transported to the sludge tank through the sludge discharge pipe without manual sludge discharge, saving labor costs and reducing safety hazards.

[0024] (3) The automated treatment system can recover kaolin from the iron removal and whitening acid water to be treated through a gravity sedimentation recovery tank, and then react and settle through a pH adjustment tank, an aeration tank, and a horizontal sedimentation tank. After that, it undergoes secondary flocculation through a mechanically accelerated clarification tank and an integrated magnetic coagulation device. It can effectively reduce acid radicals, iron ions, particulate pollutants, microbial pollutants and some pollutants already dissolved in the water, such as COD, BOD, SS, total phosphorus, color and turbidity. At the same time, it reduces the total salt content of the kaolin iron removal and whitening acid water, effectively reducing the impact on the water area and the surrounding environment.

[0025] (4) The water quality monitoring instrument is installed in the clear water tank of the automated treatment system. The water quality monitoring instrument can monitor the pH value, COD, ammonia nitrogen, SS and conductivity of the water in real time. If a problem is found, it can be fed back and dealt with in a timely manner. There is no need to wait for the manual test results to be qualified before draining the water each time, which effectively saves time and costs. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the first embodiment of the automated acid water treatment system for iron removal and whitening of kaolin, according to the present invention.

[0027] Figure 2This is a schematic diagram of the second embodiment of the automated acid water treatment system for iron removal and whitening of kaolin according to this utility model.

[0028] In the above diagram: 1-gravity sedimentation recovery tank, 2-pH adjustment tank, 21-alkali addition tank, 3-aeration tank, 4-horizontal flow sedimentation tank, 5-mechanical accelerated clarification tank, 51-PAC solution storage tank, 52-PAM solution storage tank, 6-integrated magnetic coagulation device, 7-clear water tank, 8-sludge tank, 9-water quality monitoring instrument. Detailed Implementation

[0029] To make the objectives, technical solutions and advantages of this utility model clearer, the embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0030] Example 1

[0031] Please refer to Figure 1 The present invention relates to an automated treatment system for kaolin iron removal and whitening acidic water, comprising a gravity sedimentation recovery tank 1, a pH adjustment tank 2, an aeration tank 3, a horizontal flow sedimentation tank 4, a mechanically accelerated clarification tank 5, a clear water tank 7, a sludge tank 8, and a blower aeration components.

[0032] The gravity sedimentation recovery tank 1 is equipped with an inlet pipe, which introduces the water to be treated (iron-removing whitening acid water) into the gravity sedimentation recovery tank 1, where sedimentation occurs. The upper part of the gravity sedimentation recovery tank 1 is connected to the pH adjustment tank 2 via a first connecting pipe, and the bottom of the gravity sedimentation recovery tank 1 is lower than the bottom of the adjustment tank; the first connecting pipe introduces the upper layer of water from the gravity sedimentation recovery tank 1 into the pH adjustment tank 2.

[0033] The bottom of the pH adjustment tank 2 is connected to the bottom of the aeration tank 3, and the bottom of the pH adjustment tank 2 is higher than the bottom of the aeration tank 3. An alkali addition tank 21 is located above the adjustment tank 2. The bottom of the aeration tank 3 is connected to the bottom of the horizontal flow sedimentation tank 4, and the bottom of the aeration tank 3 is higher than the bottom of the horizontal flow sedimentation tank 4. This allows the water in the pH adjustment tank 2 to flow sequentially through the aeration tank 3 and the horizontal flow sedimentation tank 4. The alkali addition tank 21 contains a saturated quicklime solution and is connected to the bottom of the pH adjustment tank 2 via an alkali addition pipe. The alkali addition tank 21 is used to add Ca(OH)2 solution to the pH adjustment tank 2, thereby adjusting the pH value of the water in the pH adjustment tank 2. A pH meter probe is installed inside the adjustment tank.

[0034] The upper part of the horizontal sedimentation tank 4 is connected to the mechanically accelerated clarification tank 5 through a second connecting pipe. The mechanically accelerated clarification tank 5 is connected to the PAC solution storage tank 51 and the PAM solution storage tank 52. The PAC solution storage tank 51 and the PAM solution storage tank 52 are used to add PAC solution and PAM solution to the mechanically accelerated clarification tank 5.

[0035] The upper part of the mechanically accelerated clarification tank 5 is connected to the clear water tank 7, and the clear water tank 7 is provided with a discharge outlet;

[0036] The bottom of the horizontal flow sedimentation tank 4 and the bottom of the mechanically accelerated clarification tank 5 are both connected to the sludge tank 8 through sludge discharge pipes.

[0037] The aeration assembly includes an air diffuser, an aeration pipe, and an aeration pump. The air diffuser is located inside the aeration tank 3, and the aeration pump is connected to the air diffuser through the aeration pipe. The aeration pump is used to transport air through the pipe to the air diffuser located at the bottom of the tank, where it diffuses and escapes as bubbles, dissolving oxygen into the water at the gas-liquid interface to achieve an aeration effect.

[0038] The mechanically accelerated clarification tank 5 is equipped with a mechanical agitator, which is used to agitate the water.

[0039] A water quality monitor 9 is installed in the clear water tank 7, and a discharge valve is installed in the discharge outlet. The water quality monitor 9 is connected to the discharge valve, and a controller is installed inside the water quality monitor. The controller is used to monitor the water quality in the clear water tank and control the discharge valve. The controller monitors the water quality in the clear water tank 7 through the water quality monitor 9 and controls the discharge valve. In this embodiment, the water quality monitor 9 is an online water quality monitor, which is wirelessly connected to the host computer and uploads water quality detection information in real time.

[0040] Understandably, both the first connecting pipe and the second connecting pipe are equipped with water pumps. The water pumps are used to enable water to flow along the first connecting pipe and the second connecting pipe.

[0041] The gravity sedimentation recovery tank 1 is also equipped with a sludge discharge device at its bottom. The sludge discharge device in the gravity sedimentation recovery tank 1 is used to discharge the sediment in the gravity sedimentation recovery tank 1. After the sediment is discharged, it is transported to the kaolin filter press workshop. The sediment in the horizontal flow sedimentation tank 4 and the mechanically accelerated clarification tank 5 can be transported to the sludge tank 8 through the sludge discharge pipe. Specifically, the sludge tank 8 is connected to the sludge discharge pipe, and the discharged sediment is transported to the sludge tank 8. The sludge tank 8 is equipped with a radial flow continuous sludge discharge device, and the sludge tank 8 is connected to the sludge filter press workshop through a pipeline. The radial flow continuous sludge discharge device can transport the sediment in the sludge tank 8 to the sludge filter press workshop. The sludge transported to the sludge filter press workshop is filtered out by a chamber hydraulic diaphragm filter press to remove waste residue.

[0042] In the above structure, the kaolin iron removal and whitening acidic water recovers more than 90% of the kaolin after gravity sedimentation and recovery tank 1. Then it undergoes reaction sedimentation in pH adjustment tank 2, aeration tank 3, and horizontal flow sedimentation tank 4. Finally, it undergoes flocculation in mechanically accelerated clarification tank 5. The treatment effect is significant, balancing the pH value to 6-9. It effectively reduces acid radicals, iron ions, particulate pollutants, microbial pollutants, and some dissolved pollutants in the water, such as COD, BOD, SS, total phosphorus, color, and turbidity. At the same time, it reduces the total salt content of the kaolin iron removal and whitening acidic water, effectively reducing the impact on the water area and the surrounding environment.

[0043] In this embodiment, the gravity sedimentation recovery tank 1 is a horizontal flow inclined tube type. The iron removal and whitening acid water enters the sedimentation recovery tank 1 through the inlet, and the upper layer solution flows out from the upper outlet. In the sedimentation zone, the solid and liquid move and separate within the inclined parallel tube, and the precipitate is discharged and recycled through the sludge discharge pipe.

[0044] Example 1: The system treats acidic wastewater from the iron removal and whitening of kaolin clay, with a daily processing capacity of 5000 m³. 3 The detection data before and after system processing are shown in the table below:

[0045] Table 1. Statistical table of detection data before and after system processing in Example 1

[0046]

[0047] Example 2

[0048] See Figure 2 To effectively improve the quality of treated water, this embodiment is based on Embodiment 1. In this embodiment, an integrated magnetic coagulation device 6 is also provided between the mechanically accelerated clarification tank 5 and the clear water tank 7. The upper part of the mechanically accelerated clarification tank 5 is connected to the integrated magnetic coagulation device 6 through a second connecting pipe. The upper part of the integrated magnetic coagulation device 6 is connected to the clear water tank 7 through a third connecting pipe, which is also equipped with a water pump. The bottom of the integrated magnetic coagulation device 6 is connected to the sludge tank through a sludge discharge pipe. Specifically, in the integrated magnetic coagulation device 6, the first-stage mixing tank is connected to the PAC solution storage tank, the third-stage mixing tank is connected to the PAM solution storage tank, the sludge storage tank is connected to the sludge tank 8, and the supernatant after the reaction in the integrated magnetic coagulation device 6 is transported to the clear water tank 7. The integrated magnetic coagulation device 6 combines magnetic powder technology with traditional coagulation and sedimentation processes, utilizing the force of a magnetic field on charged particles to rapidly coagulate small particles and colloids in the acidic water into large particles, which then settle. The integrated magnetic coagulation device 6 can accelerate the flocculation efficiency of suspended solids, colloidal substances and some dissolved pollutants in wastewater. The integrated magnetic coagulation device 6 is an existing device, and its structure will not be described in detail here.

[0049] The main technical solution of this embodiment is basically the same as that of embodiment 1. Features not explained in this embodiment are explained in embodiment 1 and will not be repeated here.

[0050] Example 2: The system treats kaolin iron removal and whitening acidic wastewater with a daily processing capacity of 4500 m³. 3 The detection data before and after system processing are shown in the table below:

[0051] Table 2. Statistical table of detection data before and after system processing in Example 2.

[0052]

[0053] Example 3

[0054] The treatment system in Example 3 has the same structure as that in Example 2, and its daily treatment capacity for kaolin iron removal and whitening acidic wastewater is 7000 m³. 3 The detection data before and after system processing are shown in the table below:

[0055] Table 3. Statistical table of detection data before and after system processing in Example 3.

[0056]

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit the scope of protection of the claims. Those skilled in the art should understand, with reference to the preferred embodiments, that modifications or equivalent substitutions can be made to the technical solution of this utility model, but such modifications or substitutions shall fall within the substantially the same and protected scope of the technical solution of this utility model.

Claims

1. An automated treatment system for acidic wastewater from iron removal and whitening of kaolin, characterized in that: It includes gravity sedimentation recovery tank, pH adjustment tank, aeration tank, horizontal flow sedimentation tank, mechanically accelerated clarification tank, clear water tank and sludge tank; The gravity sedimentation recovery tank is equipped with an inlet pipe, and the upper part of the gravity sedimentation recovery tank is connected to the pH adjustment tank through a first connecting pipe. The bottom of the gravity sedimentation recovery tank is lower than the bottom of the adjustment tank. The bottom of the pH adjustment tank is connected to the aeration tank, and the bottom of the pH adjustment tank is higher than the bottom of the aeration tank. An alkali addition tank is provided above the adjustment tank. The bottom of the aeration tank is connected to the horizontal flow sedimentation tank, and the bottom of the aeration tank is higher than the bottom of the horizontal flow sedimentation tank; The upper part of the horizontal sedimentation tank is connected to the mechanically accelerated clarification tank, and the mechanically accelerated clarification tank is connected to the PAC solution storage tank and the PAM solution storage tank. The upper part of the mechanically accelerated clarification tank is connected to the clear water tank, and the clear water tank is provided with a discharge outlet; The bottom of the horizontal sedimentation tank and the bottom of the mechanically accelerated clarification tank are both connected to the sludge tank through sludge discharge pipes.

2. The automated treatment system for acidic water used for iron removal and whitening of kaolin as described in claim 1, characterized in that: An integrated magnetic coagulation device is also provided between the mechanically accelerated clarification tank and the clear water tank. The upper part of the mechanically accelerated clarification tank is connected to the integrated magnetic coagulation device through a second connecting pipe. The upper part of the integrated magnetic coagulation device is connected to the clear water tank through a third connecting pipe. The bottom of the integrated magnetic coagulation device is connected to the sludge tank through a sludge discharge pipe.

3. The automated treatment system for acidic wastewater from iron removal and whitening of kaolin as described in claim 1, characterized in that: The clear water tank is equipped with a water quality monitoring instrument, and the discharge outlet is equipped with a discharge valve. The water quality monitoring instrument is connected to the discharge valve.

4. The automated treatment system for kaolin iron removal and whitening acidic water according to claim 1, characterized in that: It also includes a blower aeration assembly, which includes an air diffuser, an aeration pipe and an aeration pump. The air diffuser is located in the aeration tank and the aeration pump is connected to the air diffuser through the aeration pipe.

5. The automated treatment system for acidic water used for iron removal and whitening of kaolin as described in claim 1, characterized in that: The alkaline solution addition tank contains a saturated quicklime aqueous solution, and the alkaline solution addition tank is connected to the bottom of the pH adjustment tank through an alkaline solution addition pipe.

6. The automated treatment system for acidic wastewater from iron removal and whitening of kaolin as described in claim 1, characterized in that: The mechanically accelerated clarification tank is equipped with a mechanical stirrer.

7. The automated treatment system for acidic water used for iron removal and whitening of kaolin as described in claim 1, characterized in that: The equalization tank is equipped with a pH meter probe.

8. The automated treatment system for acidic water used for iron removal and whitening of kaolin as described in claim 2, characterized in that: Water pumps are installed on the first connecting pipe, the second connecting pipe, and the third connecting pipe.

9. The automated treatment system for acidic water used for iron removal and whitening of kaolin as described in claim 2, characterized in that: The PAC solution storage tank and the PAM solution storage tank are also connected to the integrated magnetic coagulation device.

10. The automated treatment system for acidic water used for iron removal and whitening of kaolin as described in claim 2, characterized in that: The gravity sedimentation recovery tank is also equipped with a sludge removal device at the bottom.

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