Separation system device for sodium sulfate and sodium nitrate carnallite wastewater

Abstract

The utility model relates to the technical field of wastewater treatment, and provides a separation system device for sodium sulfate and sodium nitrate carnallite wastewater, which comprises a reaction kettle, a first centrifugal machine, an impurity removal kettle and a second centrifugal machine which are sequentially connected, the reaction kettle is provided with a calcium nitrate feeding device, and the first centrifugal machine is communicated with the reaction kettle to separate calcium sulfate solids; the impurity removal kettle is provided with a sodium carbonate feeding device, and the second centrifugal machine is communicated with the impurity removal kettle to separate calcium carbonate solid impurities to obtain refined sodium nitrate salt liquid. The system disclosed by the utility model has the beneficial effects that a set of separation system for sodium nitrate and sodium sulfate mixed carnallite is established, so that the aims of recycling and efficiently treating high-salinity wastewater are successfully fulfilled. According to the method, the whole treatment cost of the high-salinity wastewater is remarkably reduced, the pressure in the aspect of environmental protection is greatly relieved, the problem of environmental pollution is solved, cyclic utilization of resources is promoted, and good environmental benefits and economic benefits are shown.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment, in particular to a separation system device for sodium sulfate, sodium nitrate and miscellaneous salt wastewater. Background Art

[0002] Industrial production processes often generate large quantities of high-salinity wastewater, rich in mixed salts such as sodium sulfate and sodium nitrate. Discharged directly into the natural environment without treatment, this high-salinity wastewater can severely harm ecosystems, disrupting water balance, affecting the survival of plants and animals, and even posing a potential threat to human health through the food chain. Therefore, this type of wastewater must never be discharged without specialized treatment to ensure it meets environmental standards.

[0003] Industrial saline wastewater primarily contains sodium sulfate and sodium nitrate, which are dissolved in the wastewater and difficult to directly recycle. Recycling and reusing these salts has become a pressing environmental issue. Traditional treatment methods, such as the multi-effect evaporation and crystallization method used by some domestic companies, can separate these salts to a certain extent, but they also have numerous drawbacks.

[0004] Existing multi-effect evaporation crystallization methods are significantly affected by the salt concentration of high-salt wastewater. When the salt concentration in the wastewater is too high, treatment efficiency decreases significantly, while energy consumption also increases significantly. Furthermore, this method requires large equipment investments and high operating costs, and the separation effect is not ideal. The quality of the resulting finished salt varies, resulting in low economic efficiency. Therefore, it is particularly important to develop a system for treating impure salts that is simple to operate, has low processing costs, good separation effects, and high economic benefits. Utility Model Content

[0005] To solve the problem that the traditional separation device of sodium nitrate and sodium sulfate high-salt wastewater is greatly affected by the salt concentration of high-salt wastewater and has poor separation effect;

[0006] The utility model provides a separation system device for sodium sulfate and sodium nitrate miscellaneous salt wastewater, which comprises a reactor, a first centrifuge, a de-impurity kettle and a second centrifuge connected in sequence, wherein the reactor is provided with a calcium nitrate feeding device, the first centrifuge is connected to the reactor to separate calcium sulfate solid, the de-impurity kettle is provided with a sodium carbonate feeding device, and the second centrifuge is connected to the de-impurity kettle to separate calcium carbonate solid impurities to obtain refined sodium nitrate salt solution.

[0007] As a preferred solution, the reactor is provided with an evaporator for evaporating and concentrating the high-salt wastewater.

[0008] As a preferred embodiment, the first centrifuge is provided with a first dryer to dry the calcium sulfate solid.

[0009] As a preferred embodiment, the second centrifuge is provided with an evaporation crystallizer to evaporate, concentrate and crystallize sodium nitrate salt.

[0010] Furthermore, the evaporation crystallizer is connected to a third centrifuge to separate sodium nitrate salt crystals.

[0011] Furthermore, the third centrifuge is provided with a second dryer to dry the sodium nitrate salt crystals.

[0012] As a preferred solution, the sodium carbonate delivery device and the calcium nitrate delivery device are both solid chemical delivery devices.

[0013] The beneficial effects of the utility model are:

[0014] This utility model successfully achieves the goal of resource-recycling and efficient treatment of high-salinity wastewater by establishing a separation system for mixed sodium nitrate and sodium sulfate salts. This significantly reduces the overall treatment cost of high-salinity wastewater and greatly alleviates the pressure on environmental protection. This not only solves environmental pollution problems but also promotes resource recycling, demonstrating excellent environmental and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments and in conjunction with the accompanying drawings, wherein

[0016] Figure 1 A schematic structural diagram of the present utility model.

[0017] The reference numerals in the accompanying drawings are:

[0018] 1-evaporator, 2-reactor, 3-first centrifuge, 4-impurity removal kettle, 5-second centrifuge, 6-evaporation crystallizer, 7-third centrifuge, 8-first dryer, 9-second dryer. DETAILED DESCRIPTION

[0019] To illustrate the features of the present invention, the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Example:

[0021] See also Figure 1 The embodiment of the utility model provides a separation system device for sodium sulfate and sodium nitrate miscellaneous salt wastewater, which includes a reactor 2, a first centrifuge 3, a de-impurity kettle 4 and a second centrifuge 5 connected in sequence. The reactor 2 is provided with a calcium nitrate feeding device. The first centrifuge 3 is connected to the reactor 2 to separate calcium sulfate solids. The de-impurity kettle 4 is provided with a sodium carbonate feeding device. The second centrifuge 5 is connected to the de-impurity kettle 4 to separate calcium carbonate solid impurities to obtain refined sodium nitrate salt solution.

[0022] Preferably, in this embodiment, an evaporator 1 is provided in the reactor 2 for evaporating and concentrating the high-salt wastewater.

[0023] Preferably, in this embodiment, a first dryer 9 is provided in the first centrifuge 3 to dry the calcium sulfate solid, so as to separate the calcium sulfate solid and obtain a sodium nitrate salt solution.

[0024] Preferably, in this embodiment, an evaporation crystallizer 6 is provided in the second centrifuge 5 to evaporate, concentrate and crystallize the sodium nitrate salt, so as to achieve evaporation, concentration and crystallization of the refined sodium nitrate salt solution separated by the second centrifuge 5 .

[0025] Preferably, the evaporation crystallizer 6 is connected to the third centrifuge 7 to separate sodium nitrate salt crystals, and is used to centrifugally separate the saturated sodium nitrate mother liquor and sodium nitrate crystals; the saturated sodium nitrate mother liquor is returned to the evaporation crystallizer 6 for recycling.

[0026] Preferably, the third centrifuge 7 is provided with a second dryer 8 for drying the sodium nitrate salt crystals, which is used to dry the sodium nitrate crystals separated by the third centrifuge 7 to obtain a high-purity sodium nitrate product.

[0027] In addition, in order to improve the processing effect, in this embodiment, the evaporator is preferably an MVR evaporator; the evaporation crystallizer is preferably an MVR evaporation crystallizer; the centrifuge is preferably a horizontal centrifuge; the dryer is preferably a vacuum dryer, and the sodium carbonate dosing device and the calcium nitrate dosing device are both solid chemical dosing devices.

[0028] The above embodiments and accompanying drawings are intended only to illustrate the technical solutions of the present invention and are not intended to limit the present invention. The present invention has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions, or substitutions made by those skilled in the art within the spirit of the present invention do not depart from the spirit of the present invention and are intended to fall within the scope of the claims of the present invention. Other related technical structures not fully disclosed in this utility model are prior art in the art.

Claims

1. A separation system for sodium sulfate and sodium nitrate wastewater, characterized in that: The invention comprises a reaction kettle (2), a first centrifuge (3), an impurity removal kettle (4) and a second centrifuge (5) connected in sequence, wherein the reaction kettle (2) is provided with a calcium nitrate feeding device, the first centrifuge (3) is connected to the reaction kettle (2) to separate calcium sulfate solid, the impurity removal kettle (4) is provided with a sodium carbonate feeding device, and the second centrifuge (5) is connected to the impurity removal kettle (4) to separate calcium carbonate solid impurities, thereby obtaining a refined sodium nitrate salt solution.

2. The separation system device for sodium sulfate and sodium nitrate miscellaneous salt wastewater according to claim 1, characterized in that: The reactor (2) is provided with an evaporator (1) for evaporating and concentrating high-salt wastewater.

3. The separation system device for sodium sulfate and sodium nitrate miscellaneous salt wastewater according to claim 1 is characterized in that: The first centrifuge (3) is provided with a first dryer (9) for drying the calcium sulfate solid.

4. The separation system device for sodium sulfate and sodium nitrate miscellaneous salt wastewater according to claim 1 is characterized in that: The second centrifuge (5) is provided with an evaporation crystallizer (6) for evaporating, concentrating and crystallizing sodium nitrate salt.

5. The separation system device for sodium sulfate and sodium nitrate miscellaneous salt wastewater according to claim 4 is characterized in that: The evaporation crystallizer (6) is connected to the third centrifuge (7) to separate sodium nitrate salt crystals.

6. The separation system device for sodium sulfate and sodium nitrate miscellaneous salt wastewater according to claim 5 is characterized in that: The third centrifuge (7) is provided with a second dryer (8) for drying the sodium nitrate salt crystals.

7. The separation system device for sodium sulfate and sodium nitrate miscellaneous salt wastewater according to claim 1 is characterized in that: The sodium carbonate delivery device and the calcium nitrate delivery device are both solid chemical delivery devices.

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