Device for controlling volume expansion of electrolytic zinc

Abstract

The utility model discloses a device for controlling volume expansion of electrolytic zinc, which comprises a vapor-liquid separator, one side of the vapor-liquid separator is fixedly connected with a vapor exhaust pipe, one end of the vapor exhaust pipe is fixedly connected with a Roots blower, one end of the Roots blower is fixedly connected with a vapor extraction pipe, one end of the vapor extraction pipe is fixedly connected with a vacuum spray tower, and the other end of the vapor extraction pipe is fixedly connected with a vacuum pump. Through the arrangement of the first-stage spiral plate heat exchanger, the Roots blower, the vacuum spray tower and the second-stage spiral plate heat exchanger, high efficiency and energy conservation are achieved, and the technological process is shortened; the separated excess water pollution is small, can be used for other positions of the electrolytic zinc system, such as slag washing, cloth washing, electrolytic plate washing, tail gas dust collection and the like, and can be directly used for the electrolytic zinc electrolysis process without purification due to few harmful impurities, so that the problem of volume expansion of the solution of the electrolytic zinc system is solved under the condition of realizing low cost and low pollution; and a foundation is laid for resource utilization of natural zinc oxide, secondary zinc oxide, copper-cadmium slag and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of electrolytic zinc, in particular to a device for controlling volume expansion of electrolytic zinc. Background Art

[0002] However, during the use of the existing device for controlling the volume expansion of electrolytic zinc, the problem is generally solved by controlling the water entry and natural evaporation, cooling tower evaporation, and slag removal. The system solution can also be partially opened, alkali is added to generate basic zinc carbonate precipitate, and then the excess volume of the system is discharged after liquid-solid separation. However, this method has high consumption cost, long process flow, high heavy metal content in post-processed water, and increased environmental pressure. For this reason, we propose a device for controlling the volume expansion of electrolytic zinc. Utility Model Content

[0003] 1. Technical issues to be resolved

[0004] In view of the deficiencies of the prior art, the utility model provides a device for controlling volume expansion of electrolytic zinc to solve the problems raised in the above background technology.

[0005] (II) Technical solution

[0006] To achieve the above purpose, the utility model is implemented through the following technical scheme: a device for controlling volume expansion of electrolytic zinc, comprising a vapor-liquid separator, one side of the vapor-liquid separator is fixedly connected to an exhaust pipe, one end of the exhaust pipe is fixedly connected to a Roots blower, one end of the Roots blower is fixedly connected to an extraction pipe, one end of the extraction pipe is fixedly connected to a vacuum spray tower, the bottom of the vapor-liquid separator is fixedly connected to a liquid infusion pipe, one end of the liquid infusion pipe is fixedly connected to an evaporative hot water bucket, the top of the evaporative hot water bucket is respectively fixedly connected to a steam pipeline and a liquid collection pipe, one end of the steam pipeline is fixedly connected to a primary spiral plate heat exchanger, the outer sides of the primary spiral plate heat exchanger are respectively fixedly connected to an external steam pipe and a spray pipe, and one end of the liquid collection pipe is fixedly connected to a secondary spiral plate heat exchanger.

[0007] Further preferably, a vapor-liquid pipe is fixedly connected to the top of the vapor-liquid separator, one end of the vapor-liquid pipe is fixedly connected to a steam transmission pipe, and the steam transmission pipe is fixedly connected to the secondary spiral plate heat exchanger.

[0008] Further preferably, a spray recovery pipe is fixedly connected to the bottom of the vacuum spray tower, one end of the spray recovery pipe is fixedly connected to a circulating liquid barrel, and one side of the circulating liquid barrel is fixedly connected to a circulating inlet pipe.

[0009] Further preferably, one end of the spray pipe is fixedly connected to a spray head, and the spray pipe is fixedly connected to the vacuum spray tower.

[0010] Further preferably, a heat exchange connecting pipe is fixedly connected between the primary spiral plate heat exchanger and the secondary spiral plate heat exchanger, and the heat exchange connecting pipe is a hollow structure.

[0011] Further preferably, a circulation outlet pipe is fixedly connected to the outer side of the secondary spiral plate heat exchanger, one end of the circulation outlet pipe is fixedly connected to a solution circulation pump, and the outer side of the solution circulation pump is fixedly connected to a circulation inlet pipe.

[0012] (III) Beneficial effects

[0013] The utility model provides a device for controlling volume expansion of electrolytic zinc, which has the following beneficial effects:

[0014] (1) The device for controlling volume expansion of electrolytic zinc is provided with a primary spiral plate heat exchanger, a Roots blower, a vacuum spray tower and a secondary spiral plate heat exchanger. During use, the principle that the boiling point of water is lower under vacuum is utilized, and the Roots blower adjusts the vacuum of the vacuum spray tower to 40-90Kpa. The vacuum is generated by the Roots blower due to the large exhaust volume. Crystallization will occur after the solution evaporates. If a traditional shell and tube heat exchanger is used, it will be blocked, affecting the heat exchange and evaporation effect. The first spiral plate heat exchanger and the second spiral plate heat exchanger of the spiral plate type are used for heating in the utility model, which can increase the evaporation effect. The utility model adopts a vacuum spray tower to spray the solution into mist to solve the evaporation area problem. The actual vacuum degree obtained by the Roots blower in the tower is 40-60Kpa, achieving the effect of concentrated volume. After the vacuum spray tower is used to extract The water content in the vapor phase is heavy, which will affect the flow resistance. A vapor-liquid separator is used, and the residual heat of the vapor after separation enters the secondary spiral plate heat exchanger for further heat utilization. The high temperature of the original steam heats the high-temperature liquid after heating by the secondary spiral plate heat exchanger, and the exhaust heat after vapor-liquid separation by the Roots blower heats the original solution with a low temperature, effectively utilizing the heat exchange temperature difference between the vapor and the liquid, thereby achieving high efficiency and energy saving and shortening the process flow; and the separated excess water has little pollution and can be used in other positions of the electrolytic zinc system, such as: slag washing, cloth washing, electrolytic plate washing, tail steam dust collection, etc., and because of its few harmful impurities, it can be directly used in the electrolytic zinc electrolysis process without purification. Therefore, the problem of volume expansion of the electrolytic zinc system solution is solved under low cost and low pollution, laying a foundation for the resource utilization of natural zinc oxide, secondary zinc oxide, copper-cadmium slag, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 It is a schematic diagram of the working principle of the utility model.

[0017] In the figure: 1. vapor-liquid separator; 2. vapor-liquid pipe; 3. steam pipe; 4. liquid pipe; 5. evaporative hot water barrel; 6. steam pipeline; 7. primary spiral plate heat exchanger; 701. external steam pipe; 8. spray pipe; 9. spray head; 10. exhaust pipe; 11. Roots blower; 12. steam extraction pipe; 13. vacuum spray tower; 14. spray recovery pipe; 15. circulating liquid barrel; 16. heat exchange connecting pipe; 17. secondary spiral plate heat exchanger; 18. liquid collection pipe; 19. circulating outlet pipe; 20. solution circulating pump; 21. circulating inlet pipe. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0019] See also Figure 1-2 The utility model provides a technical solution: a device for controlling volume expansion of electrolytic zinc, comprising a vapor-liquid separator 1, a steam exhaust pipe 10 is fixedly connected to one side of the vapor-liquid separator 1, a Roots blower 11 is fixedly connected to one end of the steam exhaust pipe 10, a steam extraction pipe 12 is fixedly connected to one end of the Roots blower 11, a vacuum spray tower 13 is fixedly connected to one end of the steam extraction pipe 12, a liquid infusion pipe 4 is fixedly connected to the bottom of the vapor-liquid separator 1, an evaporative hot water bucket 5 is fixedly connected to one end of the liquid infusion pipe 4, a steam pipe 6 and a liquid collecting pipe 18 are respectively fixedly connected to the top of the evaporative hot water bucket 5, a first-level spiral plate heat exchanger 7 is fixedly connected to one end of the steam pipe 6, an external steam pipe 701 and a spray pipe 8 are respectively fixedly connected to the outer side of the first-level spiral plate heat exchanger 7, and a second-level spiral plate heat exchanger 17 is fixedly connected to one end of the liquid collecting pipe 18.

[0020] In this embodiment, specifically, a vapor-liquid pipe 2 is fixedly connected to the top of the vapor-liquid separator 1, one end of the vapor-liquid pipe 2 is fixedly connected to a steam transmission pipe 3, the steam transmission pipe 3 is fixedly connected to the secondary spiral plate heat exchanger 17, and vapor-liquid separation is performed through the vapor-liquid separator 1, so that the vapor enters the secondary spiral plate heat exchanger 17 through the steam transmission pipe 3 for heating.

[0021] In this embodiment, specifically, a spray recovery pipe 14 is fixedly connected to the bottom of the vacuum spray tower 13, one end of the spray recovery pipe 14 is fixedly connected to a circulating liquid barrel 15, and one side of the circulating liquid barrel 15 is fixedly connected to a circulating inlet pipe 21, which can collect the solution through the circulating liquid barrel 15.

[0022] In this embodiment, specifically, one end of the spray pipe 8 is fixedly connected to a spray head 9, and the spray pipe 8 is fixedly connected to the vacuum spray tower 13, so that steam can be better added through the spray head 9 for large-scale spraying.

[0023] In this embodiment, specifically, a heat exchange connecting pipe 16 is fixedly connected between the primary spiral plate heat exchanger 7 and the secondary spiral plate heat exchanger 17. The heat exchange connecting pipe 16 is a hollow structure, so that the primary spiral plate heat exchanger 7 and the secondary spiral plate heat exchanger 17 can be connected through the heat exchange connecting pipe 16. At the same time, the spiral plate type primary spiral plate heat exchanger 7 and the secondary spiral plate heat exchanger 17 are used for heating, which can increase the evaporation effect.

[0024] In the present embodiment, specifically, a circulation outlet pipe 19 is fixedly connected to the outer side of the secondary spiral plate heat exchanger 17, one end of the circulation outlet pipe 19 is fixedly connected to a solution circulation pump 20, and a circulation inlet pipe 21 is fixedly connected to the outer side of the solution circulation pump 20, so that the solution circulation pump 20 can extract the solution in the circulation liquid barrel 15 through the circulation inlet pipe 21.

[0025] Working principle: After the utility model is installed, first check the installation and safety protection of the utility model. Before evaporation, the main components of the zinc sulfate solution are: Zn101g / L, PH5.0, secondary heating: add 100m in the solution circulation pump 20 after evaporation. 3 The solution contains 101g / L zinc and has a pH of 5.0. Start the solution circulation pump 20 and pump the solution circulation pump 20 into the secondary spiral plate heat exchanger 17. The solution enters the primary spiral plate heat exchanger 7 after being heated by the secondary steam of the Roots blower 11. The secondary steam is discharged into the steam condensate buffer tank for other uses after heat exchange. Primary heating: After the primary steam further increases the temperature to 95°C, it enters the vacuum spray tower 13 through the spray pipe 8. The steam evaporated in the empty tower is discharged into the secondary spiral plate heat exchanger 17 through the Roots blower 11; the evaporated solution flows back to the evaporated solution circulation pump 20 through the spray recovery pipe 14 at the bottom of the spray tower. After two-stage heating and negative pressure evaporation, the concentrated solution is concentrated. After evaporation, the solution contains 155g / L zinc, and the evaporation and concentration operation is completed. This completes the use of the utility model. Before evaporation, the main components of the zinc sulfate solution are: Zn89g / L, PH5.0. After two-stage heating and negative pressure evaporation and concentration, the solution contains 158g / L zinc. Before evaporation, the main components of the zinc sulfate solution are: Zn95g / L, PH5.0. After two-stage heating and negative pressure evaporation and concentration, the solution contains 156g / L zinc, making the heavy metal content of the water after vacuum evaporation: Zn5.4mg / L, Cd1.1mg / L, PH6.5. It is used for secondary reuse by filter pressing and washing, reducing the amount of fresh water used, and at the same time, the heat energy of condensed water can be used, achieving multiple goals at one stroke. The utility model has a simple structure and is safe and convenient to use.

[0026] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for controlling volume expansion of electrolytic zinc, comprising a vapor-liquid separator (1), characterized in that: One side of the vapor-liquid separator (1) is fixedly connected to an exhaust pipe (10), one end of the exhaust pipe (10) is fixedly connected to a Roots blower (11), one end of the Roots blower (11) is fixedly connected to a steam extraction pipe (12), one end of the steam extraction pipe (12) is fixedly connected to a vacuum spray tower (13), the bottom of the vapor-liquid separator (1) is fixedly connected to a liquid infusion pipe (4), one end of the liquid infusion pipe (4) is fixedly connected to an evaporative hot water barrel (5), the top of the evaporative hot water barrel (5) is respectively fixedly connected to a steam pipeline (6) and a liquid collection pipe (18), one end of the steam pipeline (6) is fixedly connected to a primary spiral plate heat exchanger (7), the outer side of the primary spiral plate heat exchanger (7) is respectively fixedly connected to an external steam pipe (701) and a spray pipe (8), and one end of the liquid collection pipe (18) is fixedly connected to a secondary spiral plate heat exchanger (17).

2. The device for controlling volume expansion of electrolytic zinc according to claim 1, characterized in that: A vapor-liquid pipe (2) is fixedly connected to the top of the vapor-liquid separator (1), one end of the vapor-liquid pipe (2) is fixedly connected to a steam transmission pipe (3), and the steam transmission pipe (3) is fixedly connected to a secondary spiral plate heat exchanger (17).

3. The device for controlling volume expansion of electrolytic zinc according to claim 1, characterized in that: The bottom of the vacuum spray tower (13) is fixedly connected to a spray recovery pipe (14), one end of the spray recovery pipe (14) is fixedly connected to a circulating liquid barrel (15), and one side of the circulating liquid barrel (15) is fixedly connected to a circulating inlet pipe (21).

4. The device for controlling volume expansion of electrolytic zinc according to claim 1, characterized in that: One end of the spray pipe (8) is fixedly connected to a spray head (9), and the spray pipe (8) is fixedly connected to a vacuum spray tower (13).

5. The device for controlling volume expansion of electrolytic zinc according to claim 1, characterized in that: A heat exchange connecting pipe (16) is fixedly connected between the primary spiral plate heat exchanger (7) and the secondary spiral plate heat exchanger (17), and the heat exchange connecting pipe (16) is a hollow structure.

6. The device for controlling volume expansion of electrolytic zinc according to claim 1, characterized in that: The outer side of the secondary spiral plate heat exchanger (17) is fixedly connected to a circulation outlet pipe (19), one end of the circulation outlet pipe (19) is fixedly connected to a solution circulation pump (20), and the outer side of the solution circulation pump (20) is fixedly connected to a circulation inlet pipe (21).

Images