Treatment system for purifying waste salt crystals

Abstract

The utility model discloses a treatment system for waste salt crystal purification, which relates to the technical field of waste salt resource recovery and comprises a salt bin, a conveying device, a slurry preparing, washing and separating device and a salt dissolving pond, the salt bin is used for storing waste salt, and the conveying device is arranged between the salt bin and the slurry preparing, washing and separating device. The conveying device can convey waste salt from the salt bin into the slurry preparing, washing and separating device, the slurry preparing, washing and separating device is arranged between the conveying device and the salt dissolving pond, the slurry preparing, washing and separating device can perform slurry preparing, washing and solid-liquid separation on the waste salt so as to obtain washed waste salt and washing brine, and the salt dissolving pond can receive the washed waste salt and pure water. The washed waste salt is dissolved in the pure water; according to the utility model, the waste salt crystal can be effectively purified.

Description

Technical Field

[0001] The utility model relates to the technical field of waste salt resource recovery, in particular to a treatment system for purifying waste salt crystals. Background Technique

[0002] Waste salt is a common by-product in the chemical industry. If waste salt is not properly treated, it will seriously threaten the quality of surface water, groundwater and soil, and then damage the ecological balance. Therefore, the resource recycling of waste salt has become a research hotspot in the current environmental protection treatment field. Among them, the effective washing and separation of waste salt from pollutants such as organic matter is the key link to realize its resource utilization.

[0003] At present, many chemical enterprises store waste salt in the factory area. Its large accumulation has significantly affected the normal operation of some enterprises. Due to the complex and diverse components of waste salt, targeted treatment measures need to be taken according to its characteristics. The industrial waste salt is mainly treated by landfill. However, this method has the following main problems: First, the investment scale of the landfill method is large, not only the investment cost is high, but also the floor area is large; Second, the number of landfills is limited, and the landfill capacity of waste salt is limited, resulting in many enterprises facing the dilemma of having nowhere to landfill waste salt; Finally, the landfill cost is high. The current landfill cost of waste salt has reached several thousand yuan, which constitutes a heavy burden on enterprises.

[0004] To sum up, there are many limitations in the industrial waste salt landfill method, and resource recycling has become a more feasible treatment plan. An efficient waste salt washing technology will strongly promote the resource recovery of industrial waste salt, help the industry achieve resource-based and intensive development, and then realize the large-scale promotion of waste salt resource recycling. Content of the Utility Model

[0005] The purpose of the utility model is to provide a treatment system for purifying waste salt crystals, so as to solve the problems existing in the above-mentioned prior art and be able to effectively purify waste salt crystals.

[0006] To achieve the above purpose, the utility model provides the following scheme:

[0007] The utility model provides a treatment system for purifying waste salt crystals, including a salt bin, a conveying device, a slurry preparation washing and separation device, and a salt dissolving tank. The salt bin is used for storing waste salt. The conveying device is arranged between the salt bin and the slurry preparation washing and separation device. The conveying device can convey the waste salt from the salt bin to the slurry preparation washing and separation device. The slurry preparation washing and separation device is arranged between the conveying device and the salt dissolving tank. The slurry preparation washing and separation device can perform slurry preparation washing and solid-liquid separation on the waste salt to obtain washed waste salt and washing brine. The salt dissolving tank can receive the washed waste salt and pure water so that the washed waste salt is dissolved in the pure water.

[0008] Preferably, the pulp mixing, washing and separation device includes a first-stage pulp mixing, washing and separation device, a second-stage pulp mixing, washing and separation device, and a third-stage pulp mixing, washing and separation device, and the first-stage pulp mixing, washing and separation device, the second-stage pulp mixing, washing and separation device, and the third-stage pulp mixing, washing and separation device are connected in series.

[0009] Preferably, the first-stage pulp mixing, washing and separation device includes a first-stage pulp mixing tank and a first-stage centrifuge. The first-stage pulp mixing tank is used to hold the first washing liquid and the waste salt conveyed by the conveying device, so as to mix and wash the waste salt conveyed by the conveying device in the first-stage pulp mixing tank. The first-stage centrifuge is used to receive the slurry obtained in the first-stage pulp mixing tank. The first-stage centrifuge can perform solid-liquid separation on the received slurry to obtain waste salt after the first washing and first washing brine. The waste salt after the first washing is used to be put into the second-stage pulp mixing, washing and separation device.

[0010] Preferably, the second-stage pulp mixing, washing and separation device includes a second-stage pulp mixing tank and a second-stage centrifuge. The second-stage pulp mixing tank is used to hold the second washing liquid and the waste salt after the first washing, so as to mix and wash the waste salt after the first washing in the second-stage pulp mixing tank. The second-stage centrifuge is used to receive the slurry obtained in the second-stage pulp mixing tank. The second-stage centrifuge can perform solid-liquid separation on the received slurry to obtain waste salt after the second washing and second washing brine. The waste salt after the second washing is used to be put into the third-stage pulp mixing, washing and separation device.

[0011] Preferably, the second washing brine is the first washing liquid.

[0012] Preferably, the third-stage pulp mixing, washing and separation device includes a third-stage pulp mixing tank and an integrated homogenization and purification device. The third-stage pulp mixing tank is used to hold the third washing liquid and the waste salt after the second washing, so as to mix and wash the waste salt after the second washing in the third-stage pulp mixing tank. The integrated homogenization and purification device is used to receive the slurry obtained in the third-stage pulp mixing tank. The integrated homogenization and purification device can perform solid-liquid separation on the received slurry to obtain waste salt after the third washing and third washing brine. The waste salt after the third washing is used to be put into the salt dissolving tank.

[0013] Preferably, the third washing brine is the second washing liquid.

[0014] Preferably, the pure water added to the salt dissolving tank is the first pure water, and the third washing liquid is the second pure water.

[0015] Preferably, the integrated homogenization and purification device uses a separation sieve made of 2205 duplex stainless steel with a screen hole diameter of 0.02 mm.

[0016] Preferably, the conveying device is a double-motor screw conveying device capable of bidirectional conveying of the waste salt; a vibration device is provided on the salt bin.

[0017] The utility model has achieved the following technical effects compared with the prior art:

[0018] The waste salt crystal purification treatment system provided by the utility model ensures the smooth progress of the waste salt purification and washing process through the orderly combination and efficient cooperation among various devices, significantly improves the efficiency and quality of waste salt purification, and provides a strong guarantee for the reuse of waste salt resources. Specifically, a salt bin is set to store waste salt, a conveying device is set for the conveying and lifting of solid waste salt, the waste salt is conveyed from the salt bin to the slurry preparation, washing and separation device, and the waste salt is slurried, washed and solid-liquid separated by the slurry preparation, washing and separation device to obtain the washed waste salt and washing brine. Finally, in the salt dissolving tank, the washed waste salt is dissolved in pure water, which can effectively wash and remove the high-concentration pollutants adsorbed on the solid waste salt, realize the effective purification of waste salt crystals, and is conducive to the resource recovery treatment of waste salt. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 It is a schematic diagram of the waste salt crystal purification treatment system provided by the present invention;

[0021] In the figure: 1 - salt bin, 2 - salt dissolving tank, 3 - conveying device, 4 - first-stage slurry preparation, washing and separation device, 5 - second-stage slurry preparation, washing and separation device, 6 - third-stage slurry preparation, washing and separation device, 7 - first-stage slurry preparation tank, 8 - first-stage centrifuge, 9 - first washed waste salt, 10 - first washing brine, 11 - second-stage slurry preparation tank, 12 - second-stage centrifuge, 13 - second washed waste salt, 14 - second washing brine, 15 - third-stage slurry preparation tank, 16 - integrated homogenization and purification device, 17 - third washed waste salt, 18 - third washing brine, 19 - first pure water, 20 - second pure water. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] The purpose of the present invention is to provide a treatment system for purifying waste salt crystals to solve the problems existing in the above-mentioned prior art and to effectively purify waste salt crystals.

[0024] To make the above-mentioned objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0025] As Figure 1 shown, the present invention provides a treatment system for purifying waste salt crystals, including a salt bin 1, a conveying device 3, a slurry preparation, washing, and separation device, and a salt dissolving tank 2. The salt bin 1 is used for storing waste salt. The conveying device 3 is arranged between the salt bin 1 and the slurry preparation, washing, and separation device. The conveying device 3 can convey the waste salt from the salt bin 1 to the slurry preparation, washing, and separation device. The slurry preparation, washing, and separation device is arranged between the conveying device 3 and the salt dissolving tank 2. The slurry preparation, washing, and separation device can perform slurry preparation, washing, and solid-liquid separation on the waste salt to obtain washed waste salt and washing brine. The salt dissolving tank 2 can receive the washed waste salt and pure water so that the washed waste salt dissolves in the pure water.

[0026] The treatment system for purifying waste salt crystals provided by the present invention ensures the smooth progress of the waste salt purification and washing process through the orderly combination and efficient cooperation among various devices, significantly improves the efficiency and quality of waste salt purification, and provides a strong guarantee for the reuse of waste salt resources. Specifically, the salt bin 1 is set to store waste salt, the conveying device 3 is set for the conveying and lifting of solid waste salt, the waste salt is conveyed from the salt bin 1 to the slurry preparation, washing, and separation device, the slurry preparation, washing, and separation device performs slurry preparation, washing, and solid-liquid separation on the waste salt to obtain washed waste salt and washing brine, and finally, in the salt dissolving tank 2, the washed waste salt dissolves in the pure water, which can effectively wash and remove high-concentration pollutants adsorbed on the solid waste salt, realize the effective purification of waste salt crystals, and is beneficial to the resource recovery treatment of waste salt.

[0027] Further, the pulp mixing and washing separation device includes a first-stage pulp mixing and washing separation device 4, a second-stage pulp mixing and washing separation device 5, and a third-stage pulp mixing and washing separation device 6. The first-stage pulp mixing and washing separation device 4, the second-stage pulp mixing and washing separation device 5, and the third-stage pulp mixing and washing separation device 6 are connected in series to achieve the gradual pulp mixing and washing of solid waste salt and solid-liquid separation. Through the three-stage purification and washing process, more than 90% of the pollutants in the waste salt can be successfully separated, and at the same time, the purification and extraction of nearly saturated brine can be realized, effectively improving the efficiency and purity of waste salt treatment.

[0028] Purified nearly saturated brine with more than 90% of pollutants removed can be obtained in the salt dissolving tank 2, and the nearly saturated brine can be used for the resource treatment of waste salt.

[0029] Further, the first-stage pulp mixing and washing separation device 4 includes a first-stage pulp mixing tank 7 and a first-stage centrifuge 8. The first-stage pulp mixing tank 7 is used to hold the first washing liquid and the waste salt conveyed by the conveying device 3 to pulp and wash the waste salt conveyed by the conveying device 3 in the first-stage pulp mixing tank 7. The first-stage centrifuge 8 is used to receive the slurry obtained in the first-stage pulp mixing tank 7. The first-stage centrifuge 8 can perform solid-liquid separation on the received slurry to obtain the waste salt 9 after the first washing and the first washing brine 10. The waste salt 9 after the first washing is used to be put into the second-stage pulp mixing and washing separation device 5. The waste salt conveyed by the conveying device 3 and the first washing liquid are stirred and washed in the first-stage pulp mixing tank 7; the particle size of the waste salt 9 after the first washing obtained in the first-stage centrifuge 8 is ≥0.1 mm.

[0030] Further, the second-stage pulp mixing and washing separation device 5 includes a second-stage pulp mixing tank 11 and a second-stage centrifuge 12. The second-stage pulp mixing tank 11 is used to hold the second washing liquid and the waste salt 9 after the first washing to pulp and wash the waste salt 9 after the first washing in the second-stage pulp mixing tank 11. The second-stage centrifuge 12 is used to receive the slurry obtained in the second-stage pulp mixing tank 11. The second-stage centrifuge 12 can perform solid-liquid separation on the received slurry to obtain the waste salt 13 after the second washing and the second washing brine 14. The waste salt 13 after the second washing is used to be put into the third-stage pulp mixing and washing separation device 6. The waste salt 9 after the first washing and the second washing liquid are stirred and washed in the second-stage pulp mixing tank 11; the particle size of the waste salt 13 after the second washing obtained in the second-stage centrifuge 12 is ≥0.1 mm.

[0031] Further, the second washing brine 14 is the first washing liquid, which improves the waste salt recovery rate and utilization rate in the second washing brine 14.

[0032] Furthermore, the third-stage pulp mixing and washing separation device 6 includes a third-stage pulp mixing tank 15 and an integrated homogenization and purification device 16. The third-stage pulp mixing tank 15 is used to hold the third washing liquid and the waste salt 13 after the second washing, so as to mix and wash the waste salt 13 after the second washing in the third-stage pulp mixing tank 15. The integrated homogenization and purification device 16 is used to receive the slurry obtained in the third-stage pulp mixing tank 15. The integrated homogenization and purification device 16 can perform solid-liquid separation on the received slurry to obtain the waste salt 17 after the third washing and the third washing brine 18. The waste salt 17 after the third washing is used to be put into the salt dissolving tank 2. The waste salt 13 after the second washing and the third washing liquid are stirred and washed in the third-stage pulp mixing tank 15. The integrated homogenization and purification device 16 is used to achieve the deep washing and separation of the waste salt 13 after the second washing and the third washing liquid, and obtain the third washing brine 18 and the further purified waste salt 17 after the third washing.

[0033] Furthermore, the third washing brine 18 is the second washing liquid, which improves the recovery rate and utilization rate of the waste salt in the third washing brine 18.

[0034] Furthermore, the pure water added to the salt dissolving tank 2 is the first pure water 19, and the third washing liquid is the second pure water 20, which can ensure the washing effect.

[0035] Furthermore, the integrated homogenization and purification device 16 uses a separation sieve made of 2205 duplex stainless steel with a screen hole diameter of 0.02 mm, which can ensure the solid-liquid separation effect.

[0036] Furthermore, the conveying device 3 is a double-motor screw conveying device 3, which can convey the waste salt bidirectionally, realize flexible transportation and lifting in both directions, ensure the stable transportation and lifting of the waste salt, and improve the operation efficiency. A vibration device is provided on the salt bin 1 to vibrate the waste salt in the salt bin 1 through the vibration device, improve the fluidity of the solid waste salt, ensure that the waste salt will not affect the normal feeding due to caking, and ensure the stable feeding of the solid waste salt.

[0037] In the present utility model, specific examples are used to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model. At the same time, for those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A treatment system for purifying waste salt crystals, characterized in that: It includes a salt silo, a conveying device, a slurry washing and separation device and a salt dissolving pool, wherein the salt silo is used to store waste salt, the conveying device is arranged between the salt silo and the slurry washing and separation device, the conveying device can convey the waste salt from the salt silo to the slurry washing and separation device, the slurry washing and separation device is arranged between the conveying device and the salt dissolving pool, the slurry washing and separation device can wash the waste salt and separate the solid and liquid to obtain washed waste salt and washing brine, and the salt dissolving pool can receive the washed waste salt and pure water to dissolve the washed waste salt in the pure water.

2. The waste salt crystal purification treatment system according to claim 1, characterized in that: The slurry mixing, washing and separation device comprises a first-stage slurry mixing, washing and separation device, a second-stage slurry mixing, washing and separation device and a third-stage slurry mixing, washing and separation device, and the first-stage slurry mixing, washing and separation device, the second-stage slurry mixing, washing and separation device and the third-stage slurry mixing, washing and separation device are connected in series.

3. The waste salt crystal purification treatment system according to claim 2, characterized in that: The first-stage slurry mixing, washing and separation device includes a first-stage slurry mixing tank and a first-stage centrifuge. The first-stage slurry mixing tank is used to accommodate a first washing liquid and waste salt transported by the transport device, so as to wash the waste salt transported by the transport device in the first-stage slurry mixing tank. The first-stage centrifuge is used to receive the slurry obtained in the first-stage slurry mixing tank. The first-stage centrifuge can perform solid-liquid separation on the received slurry to obtain a first washed waste salt and a first washed brine. The first washed waste salt is used to be put into the second-stage slurry mixing, washing and separation device.

4. The waste salt crystal purification treatment system according to claim 3, characterized in that: The second-stage slurry washing and separation device includes a second-stage slurry distribution tank and a second-stage centrifuge. The second-stage slurry distribution tank is used to accommodate a second washing liquid and the first washed waste salt, so as to slurry and wash the first washed waste salt in the second-stage slurry distribution tank. The second-stage centrifuge is used to receive the slurry obtained in the second-stage slurry distribution tank. The second-stage centrifuge can perform solid-liquid separation on the received slurry to obtain the second washed waste salt and the second washing brine. The second washed waste salt is used to be put into the third-stage slurry distribution washing and separation device.

5. The waste salt crystal purification treatment system according to claim 4, characterized in that: The second washing brine is the first washing solution.

6. The waste salt crystal purification treatment system according to claim 4, characterized in that: The third-grade slurry washing and separation device includes a third-grade slurry distribution tank and an integrated homogenization and purification device. The third-grade slurry distribution tank is used to accommodate a third washing liquid and the second washed waste salt, so as to slurry and wash the second washed waste salt in the third-grade slurry distribution tank. The integrated homogenization and purification device is used to receive the slurry obtained in the third-grade slurry distribution tank. The integrated homogenization and purification device can perform solid-liquid separation on the received slurry to obtain a third washed waste salt and a third washed brine. The third washed waste salt is used to be put into the salt dissolving pool.

7. The waste salt crystal purification treatment system according to claim 6, characterized in that: The third washing brine is the second washing liquid.

8. The waste salt crystal purification treatment system according to claim 6, characterized in that: The pure water added to the salt dissolving pool is the first pure water, and the third washing liquid is the second pure water.

9. The waste salt crystal purification treatment system according to claim 6, characterized in that: The integrated homogenization and purification device uses a separation sieve made of 2205 duplex steel with a sieve hole diameter of 0.02 mm.

10. The waste salt crystal purification treatment system according to claim 1, characterized in that: The conveying device is a dual-motor screw conveying device, which can convey the waste salt in two directions; a vibration device is provided on the salt silo.

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