A white carbon black wastewater resource treatment process

Abstract

The present invention discloses a silica wastewater resource treatment process, comprising the following steps: S1, injecting raw silica wastewater to be treated into a buffer tank, adding a flocculant for buffering, and allowing impurities and suspended matter in the wastewater to settle; S2, injecting the buffered wastewater into a filter press for filtration, further separating solids from liquids by filtration, recovering the separated liquid, and reusing the separated solid silica cake; S3, evaporating the liquid produced in step S2 through a pre-evaporator, recovering the condensed water produced during evaporation, and collecting the remaining product after evaporation. The advantages of the process are that the wastewater is treated through a multi-stage evaporation and concentration process, which not only greatly reduces the polluting nature of the wastewater, but also has strong process continuity, simple operation, and a high extraction rate of recyclables, thereby greatly improving treatment efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, in particular to a process for treating white carbon black wastewater resources. Background Art

[0002] White carbon black is the common name for artificially synthesized hydrated silica powder. White carbon black is a porous substance that can be dissolved in caustic alkali and hydrofluoric acid, but is insoluble in water, solvents and some acids. It is resistant to high temperatures, non-flammable, tasteless, odorless, and has good electrical insulation. In the production process of white carbon black, a large amount of water is required. Therefore, a certain amount of wastewater will be generated in the production process. The direct discharge of wastewater not only pollutes the environment, but also many useful substances remain in the wastewater. Therefore, the discharge of wastewater together with the wastewater causes a waste of resources and is not conducive to cost savings for enterprises. Therefore, the wastewater generated in the production process of white carbon black generally needs to be treated before being discharged.

[0003] In the prior art, the existing wastewater treatment process of silica is often treated and recovered by filtration. However, the recovery rate of filtration is not high, and the filter membrane also needs to be replaced regularly, which is a relatively cumbersome process. There are also processes that use evaporation and concentration for treatment and recovery, but they only perform evaporation and concentration once, and the recovery rate of the waste is still not high. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems in the prior art and to propose a white carbon black wastewater resource treatment process.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A white carbon black wastewater resource treatment process comprises the following steps:

[0007] S1. Pour the raw water of white carbon black wastewater to be treated into a buffer tank, and add flocculant for buffering to allow impurities and suspended matter in the wastewater to settle;

[0008] S2, injecting the buffered wastewater into a filter press for filtration, further separating the solid and liquid by filtration, recovering the separated liquid, and reusing the separated solid silica cake;

[0009] S3, evaporating the liquid produced in step S2 through a pre-evaporator, recovering the condensed water produced during the evaporation, and collecting the remaining product after the evaporation;

[0010] S4, evaporating the remaining product after evaporation in step S3 again through a single-effect evaporator system, and collecting the evaporated condensed water and the remaining product;

[0011] S5. The product remaining in step S4 is filtered again by a filter press, the separated liquid is recovered, and the separated solid silica cake is reused;

[0012] S6, evaporating the condensed water collected in step S4 and the liquid separated in step S5 again through a second-effect evaporator system, the evaporated condensed water enters the pre-evaporator for evaporation, and the remaining product is collected;

[0013] S7, the product remaining in the step S6 is centrifuged at high speed by a centrifuge, and the high-chloride mother liquor produced after centrifugation is collected;

[0014] S8, drying the product after centrifugation through a dryer;

[0015] S9. The product dried by the dryer is packaged by a packaging machine.

[0016] Furthermore, in step S1, before injecting the white carbon black wastewater into the buffer tank, the pH of the wastewater is first adjusted to 6-8 by a reagent.

[0017] Furthermore, the filter press in steps S2 and S5 is a belt filter press, and the pressure of the filter press is set at 6-8 kg.

[0018] Furthermore, the flocculants used in step S1 are polyaluminum chloride and polyacrylamide, polyaluminum chloride and wastewater are added in a ratio of 0.04-0.09:1500, and polyacrylamide and wastewater are added in a ratio of 0.4-1.5:15.

[0019] Furthermore, the reagent for adjusting pH is sodium hydroxide or sodium bicarbonate.

[0020] Furthermore, the evaporated condensed water generated by the evaporation system in step 4 is stored in a water tank for use in the white carbon black production system.

[0021] The present invention has the following advantages:

[0022] 1. The wastewater is treated and recovered by evaporation and concentration. Compared with the existing technology of filtration, its recovery rate is higher. In the treatment process, there is no need to replace the filter membrane and other tedious operations. The treatment is more continuous and efficient.

[0023] 2. Through multi-stage evaporation, primary evaporation is first carried out, and then secondary evaporation is carried out through the first-effect evaporator. After the secondary evaporation is completed, the third evaporation is carried out through the second-effect evaporator. After the evaporation is completed, the product of the second-effect evaporator is returned for re-evaporation. Through multi-stage reciprocating evaporation, the extraction rate of the product in the wastewater is greatly improved, thereby reducing the pollution of the wastewater and obtaining more recycled materials;

[0024] 3. Through the setting of stirring blades and fixed plates, the materials inside the dryer are constantly stirred during drying, which increases the contact frequency between the materials and the entering dry hot air. At the same time, the hot air can enter every corner of the materials and dry the moisture on the surface of the materials. This not only greatly reduces the moisture content of the materials and improves the drying effect, but also greatly shortens the time to achieve the desired drying effect, thereby greatly improving the processing efficiency of the dryer. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a process flow chart of a white carbon black wastewater resource treatment process proposed by the present invention;

[0026] Figure 2 It is a structural schematic diagram of the dryer in the present invention;

[0027] Figure 3 for Figure 2 A magnified view of point A in the figure;

[0028] Figure 4 for Figure 2 Enlarged view of point B in FIG.

[0029] Figure 5 for Figure 2 Cross-sectional view at CC in ;

[0030] Figure 6 for Figure 2 Cross-sectional view at DD in ;

[0031] Figure 7 for Figure 6 Enlarged view of point E in .

[0032] In the figure: 1 base, 2 vertical plate, 3 rotating drum, 4 servo motor, 5 rotating shaft, 6 first gear, 7 second gear, 8 circular plate, 9 ring gear, 10 rotating rod, 11 third gear, 12 air supply pipe, 13 fourth gear, 14 fan, 15 stirring blade, 16 fixed plate, 17 exhaust pipe, 18 condenser, 19 air inlet, 20 cooling fin, 21 heat conducting plate, 22 sliding sleeve, 23 concave block, 24 spring, 25 impact plate, 26 driving block, 27 stopper, 28 inclined plate, 29 fixed rod, 30 cleaning frame, 31 reciprocating screw, 32 first bevel gear, 33 second bevel gear, 34 discharge port. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0034] Reference Figure 1 , a white carbon black wastewater resource treatment process, comprising the following steps:

[0035] S1. Injecting the raw water of the white carbon black wastewater to be treated into a buffer tank and adding a flocculant for buffering to allow impurities and suspended matter in the wastewater to settle. In step S1, before injecting the white carbon black wastewater into the buffer tank, the pH of the wastewater is first adjusted to 6-8 using a reagent, and the reagent for adjusting the pH is sodium hydroxide or sodium bicarbonate;

[0036] S2. Inject the buffered wastewater into a filter press for filtration. The solid and liquid are further separated by filtration. The separated liquid is recovered, and the separated solid silica cake is reused. The filter press in steps S2 and S5 is a belt filter press, and the pressure of the filter press is set at 6-8 kg.

[0037] S3, evaporating the liquid produced in step S2 through a pre-evaporator, recovering the condensed water produced during the evaporation, and collecting the remaining product after the evaporation;

[0038] S4, the product remaining after evaporation in step S3 is evaporated again through a single-effect evaporator system, and the evaporated condensed water and the remaining product are collected. The evaporated condensed water generated by the evaporation system in step 4 is stored in a water tank for use in the white carbon black production system;

[0039] S5. The remaining product in step S4 is filtered again through a filter press, the separated liquid is recovered, and the separated solid silica cake is reused;

[0040] S6, evaporating the condensed water collected in step S4 and the liquid separated in step S5 again through a second-effect evaporator system, the evaporated condensed water enters the pre-evaporator for evaporation, and the remaining product is collected;

[0041] S7, the product remaining in step S6 is centrifuged at high speed by a centrifuge, and the high-chloride mother liquor produced after centrifugation is collected;

[0042] S8, drying the product after centrifugation through a dryer;

[0043] S9. The product dried by the dryer is packaged by a packaging machine.

[0044] It should be noted that the existing silica treatment process is not only cumbersome to operate, but also has a low extraction rate of useful substances in the wastewater during the treatment process, resulting in highly polluting wastewater treated by the existing treatment process. At the same time, the extraction rate of recyclables is not high, resulting in low profits from the recyclables.

[0045] The present invention treats and recycles wastewater by evaporation and concentration. Compared with the prior art method of filtration, its recovery rate is higher. In the treatment process, there is no need for tedious operations such as replacing filter membranes, and the treatment is more continuous and efficient. Through multi-stage evaporation, primary evaporation is first performed, and then secondary evaporation is performed through a first-effect evaporator. After the secondary evaporation is completed, the third evaporation is performed through a second-effect evaporator. After the evaporation is completed, the product of the second-effect evaporator is returned for re-evaporation. Through multi-stage cyclic evaporation, the extraction rate of the product in the wastewater is greatly improved, thereby reducing the pollution of the wastewater, and at the same time obtaining more recycled materials and increasing the profit of recycled materials.

[0046] In addition, the above construction process can also be operated by the following dryers:

[0047] The dryer includes a base 1, the upper surface of which is fixedly connected to two vertical plates 2, and the two vertical plates 2 are rotatably connected to a rotating drum 3 through bearings. A cylinder (not shown in the figure) is provided on the side wall of the rotating drum 3 for taking and placing materials. A drying groove 301 is provided in the rotating drum 3, and a gear ring 9 is fixedly connected to the inner side wall of the drying groove 301. A servo motor 4 is fixedly connected to the upper surface of the base 1, and the output shaft of the servo motor 4 is fixedly connected to a rotating shaft 5. The rotating shaft 5 is rotatably connected to one of the vertical plates 2 through a bearing. The rotating shaft 5 is interference-fitted with a first gear 6, and the rotating drum 3 is interference-fitted with a second gear 7, and the first gear 6 is meshed with the second gear 7.

[0048] The inner wall of the drying tank 301 is rotatably connected to a circular plate 8 through a bearing, and the bearing between the two is a sealed bearing. The circular plate 8 is rotatably connected to an air supply pipe 12 through a bearing, and the bearing between the two is a sealed bearing. A fan 14 is fixedly connected to the upper surface of the base 1, and the output end of the fan 14 is fixedly connected to the air supply pipe 12. The input end of the fan 14 is connected to an external drying box. The drying box can increase the dry hot air for drying the material inside the drum 3. The air supply pipe 12 is interference-fitted with a fourth gear 13. The circular plate 8 is rotatably connected to Several rotating rods 10, the bearings between the circular plate 8 and the rotating rod 10 are sealed bearings, the rotating rod 10 is interference fit with a third gear 11, the third gear 11 is engaged with the ring gear 9 and the fourth gear 13, the side wall of the rotating rod 10 is fixedly connected to several stirring blades 15, the side wall of the air supply pipe 12 is penetrated and fixedly connected to several exhaust pipes 17, a one-way valve is provided in the exhaust pipe 17, the one-way valve only allows air to enter the exhaust pipe 17 from the air supply pipe 12 to prevent the material from flowing back into the air supply pipe 12, and several fixed plates 16 are fixedly connected to the inner wall of the rotating drum 3.

[0049] A condensation box 18 is fixedly connected to the upper surface of the base 1 through a bracket. The condensation box 18 is a hollow structure. The side wall of the condensation box 18 is rotatably connected to the drum 3 through a bearing. An air inlet 19 is provided on the side wall of the condensation box 18 close to the drum 3, and an exhaust port 34 is provided on the side wall of the condensation box 18 away from the drum 3. A cooling fin 20 is fixedly connected to the top wall of the condensation box 18. The lower surface of the cooling fin 20 is a cold end and is fixedly connected to a plurality of heat conducting plates 21 through a thermally conductive adhesive.

[0050] Two sliding sleeves 22 are fixedly connected to the upper surface of the base 1, and a concave block 23 is slidably connected inside the sliding sleeve 22. The cross-section of the concave block 23 is a concave shape with the opening facing downward. A number of springs 24 are fixedly connected between the concave block 23 and the corresponding sliding sleeve 22. The rotating shaft 5 is rotatably connected to the sliding sleeve 22 through a bearing. The side wall of the rotating shaft 5 located inside the sliding sleeve 22 is fixedly connected to a driving block 26, and the inner side wall of the groove of the concave block 23 is fixedly connected to a stopper 27. The upper surfaces of the two concave blocks 23 are jointly fixedly connected to an impact plate 25. The upper surface of the impact plate 25 is arc-shaped and glued with a rubber pad. The center of the arc surface of the impact plate 25 is located on the axis of the rotating drum 3.

[0051] A reciprocating lead screw 31 is rotatably connected through a bearing to the bottom wall of the condensation box 18. A sloping plate 28 is slidably connected inside the condensation box 18. A section of the reciprocating lead screw 31 located inside the condensation box 18 is provided with threads and is threadedly connected to the sloping plate 28, and the remaining part is a smooth structure. A plurality of fixing rods 29 are fixedly connected to the upper surface of the sloping plate 28. One end of the fixing rod 29 away from the sloping plate 28 is fixedly connected to a cleaning frame 30. The cleaning frame 30 is in a shape of a double rectangle and corresponds to the heat conducting plate 21 one by one. Brush hairs are provided on the inner side wall of the cleaning frame 30 for cleaning the surface of the heat conducting plate 21. An outer end of the reciprocating lead screw 31 located outside the condensation box 18 is in interference fit with a second bevel gear 33. One end of the rotating shaft 5 away from the servo motor 4 is in interference fit with a first bevel gear 32. The first bevel gear 32 is meshed with the second bevel gear 33.

[0052] In the present invention, the solid product obtained by centrifugation in step S7 is placed in the rotating drum 3, and the servo motor 4 and the blower 14 are turned on. The output shaft of the servo motor 4 drives the rotating shaft 5 to rotate, so that the first gear 6 in interference fit with the rotating shaft 5 rotates. The rotation of the first gear 6 drives the second gear 7 meshed with it to rotate. The second gear 7 drives the rotating drum 3 to rotate. While the rotating drum 3 rotates, it drives the toothed ring 9 to rotate. The toothed ring 9 drives the third gear 11 meshed with it to rotate. Through the meshing with the fourth gear 13, while the third gear 11 rotates itself, it drives the circular plate 8 to rotate through the rotating rod 10. The third gear 11 rotates around the fourth gear 13, so that while the rotating rod 10 rotates itself, it rotates around the air supply pipe 12. The rotating rod 10 drives the stirring blade 15 to rotate itself while rotating around the air supply pipe 12. At the same time, the blower 14 pumps dry hot air into the rotating drum 3 through the air supply pipe 12 and the exhaust pipe 17. In cooperation with the rotation of the stirring blade 15 and the fixing plate 16, while drying, the stirring blade 15 and the fixing plate 16 continuously stir the material, so that the hot air fully contacts the material, improving the contact frequency between the hot air and the material. Thus, the moisture on the surface of the material can fully absorb the heat in the hot air and then evaporate into water vapor faster, and is discharged together with the hot air, improving the drying efficiency and drying effect.

[0053] The hot air after drying carries moisture and enters the condensation box 18 through the air inlet hole 19. The water vapor in the hot air meets the cold heat conducting plate 21, quickly condenses into water droplets and adheres to the heat conducting plate 21, and drips onto the sloping plate 28 and is discharged through the discharge port 34. The condensed water is collected. After the condensed water is collected, it can be used for the production of silica white or used elsewhere, ensuring no waste of water resources.

[0054] At the same time, when the rotating shaft 5 rotates, it drives the driving block 26 to rotate. During the rotation of the driving block 26, when it contacts the stopper 27, the concave block 23 is pushed down through the stopper 27. At the same time, the concave block 23 compresses the spring 24. At the moment when the driving block 26 separates from the stopper 27, the elastic potential energy of the spring 24 is released, causing the concave block 23 to move upward instantly. The concave block 23 drives the impact plate 25 to hit the rotating drum 3, causing the rotating drum 3 to vibrate while rotating, and shake off the material attached to the inner wall of the rotating drum 3, avoiding the material adhering to the inner wall of the rotating drum 3 and making it difficult to dry. At the same time, it is also difficult to clean the inner wall of the rotating drum 3 later.

[0055] During condensation, the rotating shaft 5 drives the first bevel gear 32 which is in interference fit with it to rotate, and the first bevel gear 32 drives the second bevel gear 33 which is meshed with it to rotate, and the second bevel gear 33 drives the reciprocating screw 31 which is in interference fit with it to rotate, and the reciprocating screw 31 causes the inclined plate 28 to reciprocate up and down through the thread, and the inclined plate 28 drives the cleaning frame 30 to reciprocate up and down through the fixed rod 29. The up and down reciprocating movement of the cleaning frame 30 continuously brushes the surface of the heat conducting plate 21 through the bristles, quickly scrapes off the condensed water condensed on its surface, avoids the condensed water from adhering to the surface of the heat conducting plate 21 for a long time, and causes corrosion to the heat conducting plate 21, and at the same time accelerates the dripping of the condensed water, thereby improving the recovery efficiency of the condensed water.

[0056] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A white carbon black wastewater resource treatment process, characterized in that: The following steps are involved: S1. Pour the raw water of white carbon black wastewater to be treated into a buffer tank, and add flocculant for buffering to allow impurities and suspended matter in the wastewater to settle; S2, injecting the buffered wastewater into a filter press for filtration, further separating the solid and liquid by filtration, recovering the separated liquid, and reusing the separated solid silica cake; S3, evaporating the liquid produced in step S2 through a pre-evaporator, recovering the condensed water produced during the evaporation, and collecting the remaining product after the evaporation; S4, evaporating the remaining product after evaporation in step S3 again through a single-effect evaporator system, and collecting the evaporated condensed water and the remaining product; S5. The product remaining in step S4 is filtered again by a filter press, the separated liquid is recovered, and the separated solid silica cake is reused; S6, evaporating the condensed water collected in step S4 and the liquid separated in step S5 again through a second-effect evaporator system, the evaporated condensed water enters the pre-evaporator for evaporation, and the remaining product is collected; S7, the product remaining in the step S6 is centrifuged at high speed by a centrifuge, and the high-chloride mother liquor produced after centrifugation is collected; S8, drying the product after centrifugation through a dryer; S9, the product dried by the dryer is packaged by a packaging machine; The dryer comprises a base (1), the upper surface of the base (1) is fixedly connected to two vertical plates (2), the two vertical plates (2) are rotatably connected to a rotating drum (3) through bearings, the side wall of the rotating drum (3) is provided with a drum for taking and placing materials, a drying groove (301) is provided in the rotating drum (3), the inner side wall of the drying groove (301) is fixedly connected to a gear ring (9), the upper surface of the base (1) is fixedly connected to a servo motor (4), the output shaft of the servo motor (4) is fixedly connected to a rotating shaft (5), the rotating shaft (5) is rotatably connected to one of the vertical plates (2) through bearings, the rotating shaft (5) is interference-fitted with a first gear (6), the rotating drum (3) is interference-fitted with a second gear (7), and the first gear (6) is meshed with the second gear (7); The inner wall of the drying tank (301) is rotatably connected to a circular plate (8) through a bearing, and the bearing between the two is a sealed bearing. The circular plate (8) is rotatably connected to an air supply pipe (12) through a bearing, and the bearing between the two is a sealed bearing. The upper surface of the base (1) is fixedly connected to a fan (14), the output end of the fan (14) is fixedly connected to the air supply pipe (12), and the input end of the fan (14) is connected to an external drying box. The air supply pipe (12) is interference-fitted with a fourth gear (13). The circular plate (8) is rotatably connected to a plurality of rotating rods (10) through a bearing. The circular plate (8) and the rotating rods ( The bearing between the rotating rod (10) and the third gear (11) is a sealed bearing. The rotating rod (10) is interference-fitted with the third gear (11). The third gear (11) is meshed with the gear ring (9) and the fourth gear (13). The side wall of the rotating rod (10) is fixedly connected with a plurality of stirring blades (15). The side wall of the air supply pipe (12) is penetrated and fixedly connected with a plurality of exhaust pipes (17). A one-way valve is provided in the exhaust pipe (17). The one-way valve only allows air to enter the exhaust pipe (17) from the air supply pipe (12) to prevent the material from flowing back into the air supply pipe (12). The inner side wall of the rotating drum (3) is fixedly connected with a plurality of fixed plates (16). The upper surface of the base (1) is fixedly connected to a condensation box (18) through a bracket. The condensation box (18) is a hollow structure. The side wall of the condensation box (18) is rotatably connected to the drum (3) through a bearing. The side wall of the condensation box (18) close to the drum (3) is provided with an air inlet (19). The side wall of the condensation box (18) away from the drum (3) is provided with an outlet (34). A refrigeration fin (20) is fixedly connected to the top wall of the condensation box (18). The lower surface of the refrigeration fin (20) is a cold end and is fixedly connected to a plurality of heat conducting plates (21) through a heat conducting adhesive. Two sliding sleeves (22) are fixedly connected to the upper surface of the base (1), and a concave block (23) is slidably connected in the sliding sleeve (22). The cross section of the concave block (23) is a concave shape with the opening facing downward. A plurality of springs (24) are fixedly connected between the concave block (23) and the corresponding sliding sleeve (22). The rotating shaft (5) is rotatably connected to the sliding sleeve (22) through a bearing. The side wall of the rotating shaft (5) located inside the sliding sleeve (22) is fixedly connected to a driving block (26). The inner side wall of the groove of the concave block (23) is fixedly connected to a stopper (27). The upper surfaces of the two concave blocks (23) are fixedly connected to a striking plate (25). The upper surface of the striking plate (25) is arc-shaped and glued with a rubber pad. The center of the arc surface of the striking plate (25) is located on the axis of the rotating drum (3). A reciprocating lead screw (31) is rotatably connected through a bearing to the bottom wall of the condensation box (18). An inclined plate (28) is slidably connected within the condensation box (18). A section of the reciprocating lead screw (31) located inside the condensation box (18) is provided with threads and is threadedly connected to the inclined plate (28), and the remaining part is a smooth structure. A plurality of fixing rods (29) are fixedly connected to the upper surface of the inclined plate (28). One end of the fixing rod (29) far from the inclined plate (28) is fixedly connected to a cleaning frame (30). The cleaning frame (30) is in a shape of a Chinese character 'hui', and corresponds to the heat conducting plate (21) one by one. A brush is provided on the inner side wall of the cleaning frame (30) for cleaning the surface of the heat conducting plate (21). An end of the reciprocating lead screw (31) located outside the condensation box (18) is in interference fit with a second bevel gear (33). An end of the rotating shaft (5) far from the servo motor (4) is in interference fit with a first bevel gear (32). The first bevel gear (32) is meshed with the second bevel gear (33).

2. A white carbon black wastewater resource treatment process according to claim 1, characterized in that, In the step S1, before injecting the silica white wastewater into the buffer tank, the pH value of the wastewater is adjusted to 6 - 8 by a reagent first.

3. A white carbon black wastewater resource treatment process according to claim 1, characterized in that, In the steps S2 and S5, a belt filter press is used as the filter press, and the pressure of the filter press is set at 6 - 8 kg.

4. A white carbon black wastewater resource treatment process according to claim 1, characterized in that: The flocculants used in the step S1 are polyaluminum chloride and polyacrylamide. The polyaluminum chloride is added to the wastewater at a ratio of 0.04 - 0.09:1500, and the polyacrylamide is added to the wastewater at a ratio of 0.4 - 1.5:

15.

5. A white carbon black wastewater resource treatment process according to claim 2, characterized in that: The reagent for adjusting the pH is sodium hydroxide or sodium bicarbonate.

6. A white carbon black wastewater resource treatment process according to claim 1, characterized in that: In the step 4, the evaporation condensate water generated by the evaporation system is stored through a water tank for use in the silica white production system.

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