Efficient separation and purification device for sodium-containing wastewater
By designing a highly efficient separation and purification device for sodium-containing wastewater, using brine storage tanks, preheaters, evaporation chambers and other equipment, the Na element in the dust removal ash is extracted into high-purity sodium salt, which solves the problem of sodium salt treatment in traditional treatment methods The problem has achieved resource reuse and environmental protection.
Patent Information
- Application Number
- CN202420509143.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-15
- Publication Date
- 2025-02-18
- Estimated Expiration
- 2034-03-15
AI Technical Summary
The dust removal ash produced during steel smelting contains a large amount of sodium salt. The traditional treatment method cannot effectively solve the harm of sodium salt to blast furnace production, and the treatment method leads to waste of land resources or difficulty in selling.
A highly efficient separation and purification device for sodium-containing wastewater is designed. Through brine storage tanks, preheaters, evaporation chambers, centrifuges and fluidized beds, Na elements in dust removal ash are dissolved in water, sodium salt is extracted and sold.
It has achieved efficient extraction and purification of sodium salts, met the first-level industrial salt standards, solved the problem of solid waste pollution and realized resource reuse.
Smart Images
Figure CN222498746U_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 sodium-containing wastewater. Background Art
[0002] In 2022, my country's steel production will reach 1.018 billion tons, making it the world's largest steel producer and consumer. A large amount of dust ash is produced during the steel smelting process. According to incomplete statistics, the total amount of dust ash produced by steel enterprises is about 8%-10% of steel production. Dust ash contains a large amount of sodium salt. The traditional method for treating these dust ash is to add a low proportion of them to the sintering ingredients. With the development of blast furnace smelting technology, the harm of sodium salt to blast furnace production has received more and more attention. Sodium salt will cause nodules on the blast furnace wall, deteriorate the condition of the blast furnace, and affect the life of the furnace. Many steel mills prohibit the internal recycling of dust ash containing more harmful elements, and choose to stack or sell them to the outside. Stacking will occupy a lot of land resources; it is difficult to sell them to the outside. These two treatment methods do not fundamentally solve the problem. Utility Model Content
[0003] In response to the above technical problems, a highly efficient separation and purification device for sodium-containing wastewater is provided, which dissolves the Na element in the dust removal ash in water, extracts the Na element from the brine, forms sodium salt for sale, and solves the problem of solid waste pollution to the environment while achieving resource recycling.
[0004] The technical means adopted by the utility model are as follows:
[0005] A highly efficient separation and purification device for sodium-containing wastewater, comprising:
[0006] A salt water storage tank, wherein the salt water storage tank contains saline wastewater, wherein the saline wastewater contains sodium salt, wherein the outlet of the salt water storage tank is connected to the inlet of a sodium chloride raw material tank, wherein the outlet of the sodium chloride raw material tank is connected to the inlet of a first preheater, wherein the outlet of the first preheater is connected to the inlet of a second preheater, wherein the outlet of the second preheater is connected to the inlet of a first-effect evaporation chamber, wherein the first-effect evaporation chamber is connected to a first-effect heating chamber through a pump, wherein primary steam is introduced into the first-effect heating chamber, wherein the outlet of the first-effect evaporation chamber is connected to the inlet of a centrifuge, wherein the solid outlet of the centrifuge is connected to the inlet of a fluidized bed, wherein the liquid outlet of the centrifuge is connected to the inlet of a mother liquid tank, wherein the outlet of the mother liquid tank is connected to the liquid return port of the first-effect evaporation chamber. The first preheater is used to preheat the saline wastewater to 25-35°C, the second preheater is used to preheat the saline wastewater to 35-45°C, and the primary steam is used to raise the temperature in the first-effect evaporation chamber to 80-90°C.
[0007] Preferably, it also includes a sodium chloride accident pool, which is connected to the first-effect evaporation chamber through a pump; in an accident state, the saline wastewater in the first-effect evaporation chamber is discharged to the sodium chloride accident pool, and after the accident is resolved, the saline wastewater in the sodium chloride accident pool is discharged to the first-effect evaporation chamber.
[0008] Preferably, a ton bag is arranged at the outlet of the fluidized bed, and the salt is packed in the ton bag and then stored in the salt storage.
[0009] In the above process, the flow of materials is driven by a pump. If there is a height difference, the materials can flow by gravity.
[0010] Compared with the prior art, the utility model has the following advantages:
[0011] 1. This salt extraction device uses evaporation and crystallization to separate and extract sodium salt. The process has high separation efficiency and high purity of product salt.
[0012] 2. NaCl crystal salt products meet the first-level standard of industrial salt in "Industrial Salt" (GB / T5462-2015).
[0013] 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
[0014] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0015] Figure 1 This is a process flow chart of a highly efficient sodium-containing wastewater separation and purification device of the utility model. DETAILED DESCRIPTION
[0016] 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.
[0017] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme 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, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. 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.
[0018] 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 utility model. 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, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.
[0019] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values of the parts and steps set forth in these embodiments do not limit the scope of the utility model. 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 the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a 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 exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.
[0020] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise stated, 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 utility model: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.
[0021] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. 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 figure. For example, if the device in the accompanying 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.
[0022] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.
[0023] like Figure 1 As shown, a highly efficient separation and purification device for sodium-containing wastewater comprises:
[0024] A salt water storage tank 1, wherein the salt water storage tank 1 contains saline wastewater, wherein the saline wastewater contains sodium salt, wherein the outlet of the salt water storage tank 1 is connected to the inlet of a sodium chloride raw material tank 2, wherein the outlet of the sodium chloride raw material tank 2 is connected to the inlet of a first preheater 3, wherein the outlet of the first preheater 3 is connected to the inlet of a second preheater 4, wherein the outlet of the second preheater 4 is connected to the inlet of a first-effect evaporation chamber 5, wherein the first-effect evaporation chamber 5 is connected to a first-effect heating chamber 6 through a pump, wherein primary steam is introduced into the first-effect heating chamber 6, wherein the outlet of the first-effect evaporation chamber 5 is connected to the inlet of a centrifuge 7, wherein the solid outlet of the centrifuge 7 is connected to the inlet of a fluidized bed 8, wherein a ton bag 9 is arranged at the outlet of the fluidized bed 8, wherein the solid ...
[0025] It also includes a sodium chloride accident pool 12, which is connected to the accident liquid outlet and the accident liquid return port of the first-effect evaporation chamber 5 through a pump; in an accident state, the salt-containing wastewater in the first-effect evaporation chamber 5 is discharged to the sodium chloride accident pool 12, and after the accident is resolved, the salt-containing wastewater in the sodium chloride accident pool 12 is discharged to the first-effect evaporation chamber 5.
[0026] In the above process, the flow of materials is driven by a pump. If there is a height difference, the materials can flow by gravity.
[0027] Working status small:
[0028] The saline wastewater in the brine storage tank 1 is lifted to the sodium chloride raw material tank 2 by a pump, and then the saline wastewater in the sodium chloride raw material tank 2 is pumped into the first preheater 3 to be preheated to 25-35°C, and then flows into the second preheater 4 to be preheated to 35-45°C, and then enters the first-effect evaporation chamber 5, the first-effect evaporation chamber 5 is connected to the first-effect heating chamber 6 by a pump, and the first-effect heating chamber 6 is passed through a steam, so that the evaporation temperature of the first-effect evaporation chamber 5 is 80-90°C. When the solid-liquid ratio in the first-effect evaporation chamber 5 reaches 8%-12%, the material in the first-effect evaporation chamber 5 is pumped into the centrifuge 7 for centrifugation, and the obtained solid passes through the fluidized bed 8 to obtain the dried solid sodium salt. The solid sodium salt enters the ton bag 9 under the action of gravity, and is packaged in the form of the ton bag 9 and enters the salt storage 10. The liquid centrifuged by the centrifuge 7 enters the mother liquid tank 11 and is pumped back to the first-effect evaporation chamber 5 for re-evaporation;
[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.
Claims
1. A highly efficient separation and purification device for sodium-containing wastewater, characterized in that: include: A brine storage tank, wherein the brine storage tank contains saline wastewater, wherein the saline wastewater contains sodium salt, wherein the outlet of the brine storage tank is connected to the inlet of a sodium chloride raw material tank, wherein the outlet of the sodium chloride raw material tank is connected to the inlet of a first preheater, wherein the outlet of the first preheater is connected to the inlet of a second preheater, wherein the outlet of the second preheater is connected to the inlet of a first-effect evaporation chamber, wherein the first-effect evaporation chamber is connected to a first-effect heating chamber via a pump, wherein primary steam is introduced into the first-effect heating chamber, wherein the outlet of the first-effect evaporation chamber is connected to the inlet of a centrifuge, wherein the solid outlet of the centrifuge is connected to the inlet of a fluidized bed, wherein the liquid outlet of the centrifuge is connected to the inlet of a mother liquid tank, wherein the outlet of the mother liquid tank is connected to the liquid return port of the first-effect evaporation chamber.
2. A sodium-containing wastewater efficient separation and purification device according to claim 1, characterized in that: It also includes a sodium chloride accident pool, which is connected to the first-effect evaporation chamber through a pump; in an accident state, the salt-containing wastewater in the first-effect evaporation chamber is discharged to the sodium chloride accident pool, and after the accident is resolved, the salt-containing wastewater in the sodium chloride accident pool is discharged to the first-effect evaporation chamber.
3. A sodium-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.