Efficient separation and purification device for potassium-containing wastewater
By designing a three-effect evaporation crystal separation device for dust removal and ash treatment in steel mills, the problem of land waste and sales difficulties caused by traditional treatment methods is solved, efficient separation and purification of potassium salts are achieved, and the resource Reuse.
Patent Information
- Application Number
- CN202420509142.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-15
- Publication Date
- 2025-02-21
- Estimated Expiration
- 2034-03-15
AI Technical Summary
Traditional dust removal ash treatment methods have led to waste of land resources and difficulties in selling, and have failed to effectively solve the problem of potassium-containing wastewater treatment.
A highly efficient separation and purification device for potassium-containing wastewater was designed, and potassium salts were isolated and extracted through three-effect evaporation crystallization to form high-purity potassium chloride crystalline salts.
It has achieved efficient separation and purification of potassium salts, met industrial standards, solved the problem of solid waste pollution and realized the reuse of resources.
Smart Images
Figure CN222512823U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of industrial salt extraction and wastewater treatment, in particular to a device for efficiently separating and purifying potassium-containing wastewater. Background Art
[0002] my country is short of potassium, and agricultural potash fertilizers are primarily imported. Industrial production, such as the sintering process during ironmaking, produces large quantities of potassium-rich dust. According to incomplete statistics, steel mills generate approximately 8%-10% of steel production. Traditionally, this dust has been treated by adding a low proportion of it to the sintering batch. With the advancement of blast furnace technology, the harmful effects of potassium, sodium, and zinc on blast furnace production have become increasingly prominent. Zinc, potassium, and sodium oxides can cause nodules on the blast furnace walls, deteriorating furnace conditions and shortening the lifespan of the furnace. Consequently, many steel mills prohibit the internal recycling of dust ash, which contains high levels of harmful elements, and instead prefer to store or sell it. Stored dust requires significant land resources and is difficult to sell externally. These two treatment methods do not fundamentally address the problem. Utility Model Content
[0003] In response to the above technical problems, a high-efficiency separation and purification device for potassium-containing wastewater is provided, which dissolves the K element in the dust removal ash in water, extracts the K element from the brine, forms potassium salt and sells it, thereby solving the problem of solid waste pollution to the environment and realizing resource recycling.
[0004] The technical means adopted by this utility model are as follows:
[0005] A highly efficient separation and purification device for potassium-containing wastewater, comprising:
[0006] A regulating tank is provided, wherein the regulating tank is used to store saline wastewater containing potassium salt; the liquid outlet of the regulating tank is connected to the first liquid inlet of the raw material tank, and the liquid outlet of the raw material tank is connected to a triple-effect evaporation system; the liquid outlet of a triple-effect evaporation chamber in the triple-effect evaporation system is connected to the inlet of the cyclone, the outlet of the cyclone is connected to the inlet of the centrifuge, the solid outlet of the centrifuge is connected to the inlet of a vibrator, and the outlet of the vibrator is connected to the inlet of a fluidized bed; the liquid outlet of the centrifuge is connected to the inlet of a mother liquid tank, and the outlet of the mother liquid tank is connected to the liquid return port of the triple-effect evaporation chamber.
[0007] Preferably, the triple-effect evaporation system comprises a first preheater, a second preheater, the first-effect evaporation chamber, the second-effect evaporation chamber and the third-effect evaporation chamber, the inlets and outlets of which are connected in sequence; the first-effect evaporation chamber, the second-effect evaporation chamber and the third-effect evaporation chamber are respectively connected to the corresponding first-effect heating chamber, the second-effect heating chamber and the third-effect heating chamber through pumps; primary steam is introduced into the first-effect heating chamber to heat the first-effect heating chamber to 80-90° C., the steam in the first-effect evaporation chamber enters the second-effect heating chamber to heat the second-effect heating chamber to 70-80° C., and the secondary steam in the second-effect evaporation chamber enters the third-effect heating chamber to heat the third-effect heating chamber to 50-60° C.
[0008] The first preheater is used to preheat the saline wastewater to 25-35° C., and the second preheater is used to preheat the saline wastewater to 35-45° C. The inlet of the first preheater is connected to the liquid outlet of the raw material tank.
[0009] Preferably, a potassium chloride accident pool is further included, which is connected to the three-effect evaporation chamber through a pump; in an accident state, the saline wastewater in the three-effect evaporation chamber is discharged to the potassium chloride accident pool, and after the system operates normally, the saline wastewater in the potassium chloride accident pool is discharged to the three-effect evaporation chamber.
[0010] Preferably, the outlet of the fluidized bed is provided with a ton bag, and the salt enters the salt storage in the form of ton bags.
[0011] In the above device, the flow of material can be driven by a pump. If there is a height difference, the material can flow by itself due to gravity.
[0012] Compared with the prior art, the utility model has the following advantages:
[0013] 1. This salt extraction device uses triple-effect evaporation and crystallization to separate and extract potassium salt, with high separation efficiency and high purity of product salt.
[0014] 2. KCl crystal salt products meet the first-level standard of "Industrial Potassium Chloride" (GB / T7118-2008).
[0015] Based on the above reasons, the utility model can be widely promoted in the fields of dust removal, wastewater treatment and salt extraction in steel plants. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0017] Figure 1 This is a system layout diagram of a high-efficiency separation and purification device for potassium-containing wastewater in the utility model. DETAILED DESCRIPTION
[0018] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.
[0019] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, 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, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.
[0020] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.
[0021] Unless otherwise specified, the relative arrangement of the parts and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.
[0022] In the description of the present invention, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.
[0023] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.
[0024] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this utility model.
[0025] like Figure 1 As shown, a highly efficient separation and purification device for potassium-containing wastewater comprises:
[0026] A regulating tank 1 is provided, wherein the regulating tank 1 is used to store saline wastewater containing potassium salt; the liquid outlet of the regulating tank 1 is connected to the first liquid inlet of the raw material tank 2, and the liquid outlet of the raw material tank 2 is connected to a triple-effect evaporation system, wherein the triple-effect evaporation system includes a first preheater 3, a second preheater 4, the first-effect evaporation chamber 5, the second-effect evaporation chamber 6 and the third-effect evaporation chamber 7, the inlet and outlet of which are sequentially connected; the first-effect evaporation chamber 5, the second-effect evaporation chamber 6 and the third-effect evaporation chamber 7 are respectively connected to the corresponding first-effect heating chamber 8 and the second-effect heating chamber 9 through a pump. , a triple-effect heating chamber 10; primary steam is introduced into the primary heating chamber 5 to heat the primary heating chamber 5 to 80-90°C. The steam in the primary evaporation chamber 5 enters the secondary heating chamber 9 to heat the secondary evaporation chamber 6 to 70-80°C. The secondary steam in the secondary evaporation chamber 6 enters the triple-effect heating chamber 10 to heat the triple-effect evaporation chamber 7 to 50-60°C. The first preheater 3 is used to preheat the saline wastewater to 25-35°C, and the second preheater 4 is used to preheat the saline wastewater to 35-45°C. The inlet of the first preheater 3 is connected to the liquid outlet of the raw material tank 2.
[0027] The liquid outlet of the three-effect evaporation chamber 7 is connected to the inlet of the cyclone 11, the outlet of the cyclone 11 is connected to the inlet of the centrifuge 12, the solid outlet of the centrifuge 12 is connected to the inlet of the vibrator 13, and the outlet of the vibrator 13 is connected to the inlet of the fluidized bed 14; the outlet of the fluidized bed 14 is arranged with a ton bag 15, and the salt enters the salt storage 16 in the form of the ton bag 15.
[0028] The liquid outlet of the centrifuge 12 is connected to the inlet of the mother liquid tank 17 , and the outlet of the mother liquid tank 15 is connected to the liquid return port of the three-effect evaporation chamber 7 .
[0029] The system further comprises a potassium chloride accident pool 18, which is connected to the accident discharge port and the accident liquid return port of the three-effect evaporation chamber 7 through a pump and a valve. In an accident state, the saline wastewater in the three-effect evaporation chamber 7 is discharged to the potassium chloride accident pool 18. After the system operates normally, the saline wastewater in the potassium chloride accident pool 18 is discharged to the three-effect evaporation chamber 7.
[0030] In the above device, the flow of material can be driven by a pump. If there is a height difference, the material can flow by itself due to gravity.
[0031] In working state:
[0032] The saline wastewater from the regulating tank 1 is pumped into the raw material tank 2. After being preheated in the first preheater 3 (preheated to 25-35°C) and the second preheater 4 (preheated to 35-45°C), the saline wastewater flows by gravity into the first-effect evaporator 5 and the second-effect evaporator 6. It is then pumped into the third-effect evaporator 7. When the liquid level in each of these three evaporator chambers reaches the intermediate level, the pumps between each evaporator and the heating chamber are activated to force the saline wastewater to circulate through the heating and evaporation chambers. Primary steam is then introduced into the first-effect heating chamber 5. During the evaporation cycle, the saline wastewater is heated by the steam, reaching temperatures of 80-90°C in the first-effect evaporator 5, 70-80°C in the second-effect evaporator 6, and 50-60°C in the third-effect evaporator 7. The water in the saline wastewater is evaporated, and the concentration of the saline wastewater in the first-effect evaporation chamber 5, the second-effect evaporation chamber 6, and the third-effect evaporation chamber 7 gradually increases. When the solid-liquid ratio in the third-effect evaporation chamber 7 reaches 8% to 12%, the fluidized bed 14, the centrifuge 12, and the vibrator 13 are turned on in sequence. The solid potassium chloride salt centrifuged by the centrifuge 12 enters the fluidized bed 14 for drying under the action of gravity. The salt dried in the fluidized bed 14 enters the ton bag 15 under the action of gravity, and is packaged in the form of the ton bag 15 and then enters the salt storage 16. The mother liquor centrifuged by the centrifuge 12 flows to the mother liquor tank 17 under the action of gravity, and is returned to the third-effect evaporation chamber 7 under the action of the pump for re-evaporation and recrystallization.
[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.
Claims
1. A highly efficient separation and purification device for potassium-containing wastewater, characterized in that: include: A regulating tank, wherein the regulating tank is used to store saline wastewater containing potassium salt; the liquid outlet of the regulating tank is connected to the first liquid inlet of a raw material tank, and the liquid outlet of the raw material tank is connected to a triple-effect evaporation system, the liquid outlet of a triple-effect evaporation chamber in the triple-effect evaporation system is connected to the inlet of a cyclone, the outlet of the cyclone is connected to the inlet of a centrifuge, the solid outlet of the centrifuge is connected to the inlet of a vibrator, and the outlet of the vibrator is connected to the inlet of a fluidized bed; the liquid outlet of the centrifuge is connected to the inlet of a mother liquid tank, and the outlet of the mother liquid tank is connected to the liquid return port of the triple-effect evaporation chamber.
2. A potassium-containing wastewater efficient separation and purification device according to claim 1, characterized in that: The triple-effect evaporation system comprises a first preheater, a second preheater, a first-effect evaporation chamber, a second-effect evaporation chamber and the triple-effect evaporation chamber, the inlets and outlets of which are connected in sequence; the first-effect evaporation chamber, the second-effect evaporation chamber and the triple-effect evaporation chamber are respectively connected to the first-effect heating chamber, the second-effect heating chamber and the triple-effect heating chamber corresponding thereto through pumps; primary steam is introduced into the first-effect heating chamber, the steam in the first-effect evaporation chamber enters the second-effect heating chamber, and the secondary steam in the second-effect evaporation chamber enters the triple-effect heating chamber; the inlet of the first preheater is connected to the liquid outlet of the raw material tank.
3. A potassium-containing wastewater efficient separation and purification device according to claim 1, characterized in that: It also includes a potassium chloride accident pool, which is connected to the three-effect evaporation chamber through a pump; in an accident state, the salt-containing wastewater in the three-effect evaporation chamber is discharged to the potassium chloride accident pool, and after the accident is resolved, the salt-containing wastewater in the potassium chloride accident pool is discharged to the three-effect evaporation chamber.
4. A potassium-containing wastewater efficient separation and purification device according to claim 1, characterized in that: A big bag is arranged at the outlet of the fluidized bed.