Method for water leaching enrichment and evaporation crystallization recovery of potassium and sodium valuable elements in silicon-manganese alloy flue dust ash
Patent Information
- Application Number
- CN202611345311.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-09-01
- Publication Date
- 2026-10-20
AI Technical Summary
[0005]然而，在常温水浸条件下，单位体积水溶液能够溶解的钾、钠盐类有限
其一、本发明采用水作为浸出介质，将硅锰合金烟尘灰中的水溶性钾、钠组分转移至液相，避免大量使用酸碱药剂，具有工艺成本低、设备腐蚀风险小的优点；同时，通过将水浸温度控制在适宜加热范围内，提高单位体积水溶液中钾、钠组分的溶解量，使相同体积水溶液能够溶解更多钾、钠元素，从而降低水浸用水量和废水排放量；进一步地；
Smart Images
Figure FT_1 
Figure FT_2 
Figure FT_3
Abstract
Description
Technical Field
[0001] This invention relates to the field of metallurgical solid waste resource utilization technology, and in particular to a method for water leaching enrichment and evaporation crystallization recovery of valuable elements such as potassium and sodium in silicon-manganese alloy flue dust. Background Technology
[0002] Silicon-manganese alloy is an important deoxidizer, desulfurizer, and alloying material in the steel industry. During the smelting process of silicon-manganese alloy, the high-temperature reduction reaction in the submerged arc furnace generates a large amount of dust-laden flue gas, which, after being collected by a dust removal system, forms silicon-manganese alloy dust. This type of dust is typically fine-grained and complex in composition, containing components such as manganese, silicon, calcium, and iron, and may also be enriched with volatile or water-soluble components such as potassium, sodium, and chlorine.
[0003] In existing technologies, the resource recovery of ferrosilicon alloy flue dust mainly focuses on the utilization of the main metal components such as manganese and silicon, while insufficient attention is paid to the separation and recovery of water-soluble potassium and sodium components in the flue dust. Alkali metal components such as potassium and sodium are prone to migration and accumulation during high-temperature smelting and flue gas dust removal, resulting in significant fluctuations in the alkali metal content of different batches of flue dust. If the soluble potassium and sodium components cannot be effectively separated and recovered, it will not only lead to a waste of valuable resources but also hinder the stable control of subsequent resource recovery processes for the flue dust.
[0004] Potassium and sodium components in ferrosilicon alloy flue dust are typically highly water-soluble, making them suitable for transfer to the liquid phase via water leaching. Water leaching offers advantages such as low reagent consumption, mild operating conditions, low equipment requirements, and strong environmental adaptability. Further recycling and evaporation crystallization of the potassium- and sodium-containing leachate obtained from water leaching allows for the crystallization and precipitation of potassium and sodium salts, thereby achieving the recovery of valuable potassium and sodium components.
[0005] However, under normal temperature water leaching conditions, the amount of potassium and sodium salts that can be dissolved per unit volume of aqueous solution is limited. Simply increasing the water volume to improve potassium and sodium leaching yield would lead to a larger leachate volume, increasing the load on subsequent evaporation and concentration, and potentially creating significant wastewater treatment pressure. Therefore, it is necessary to improve the solubility of potassium and sodium components per unit volume of aqueous solution without significantly increasing process complexity, in order to reduce water consumption and wastewater discharge during leaching.
[0006] Based on this, the present invention controls the water immersion temperature within a suitable heating range. Within this temperature range, the solubility of water-soluble potassium and sodium salts in the liquid phase is enhanced, which is beneficial for dissolving more potassium and sodium elements in the same volume of aqueous solution, increasing the concentration of the leachate, and reducing the pressure of subsequent water treatment and the amount of wastewater discharged.
[0007] Therefore, there is an urgent need to provide a method for recovering valuable potassium and sodium elements from ferrosilicon manganese alloy dust samples with a simple process, low reagent consumption, and applicability to different sources, so as to achieve the enrichment, separation, and crystallization recovery of water-soluble potassium and sodium components in the dust. Summary of the Invention
[0008] The purpose of this invention is to provide a method for the water leaching enrichment and evaporation crystallization recovery of valuable potassium and sodium elements in silicon-manganese alloy flue dust. The method uses existing circulating and non-circulating samples as the treatment objects, and performs water leaching enrichment under heating conditions to allow water-soluble potassium and sodium components to fully enter the liquid phase. Then, the potassium and sodium salts are crystallized out by evaporation crystallization, thereby achieving the separation and recovery of valuable potassium and sodium elements.
[0009] The above-mentioned technical objective of the present invention is achieved through the following technical solution: A method for the water leaching enrichment and evaporation crystallization recovery of valuable potassium and sodium elements in silicon-manganese alloy flue dust includes the following steps: S1. Pretreatment of silicon-manganese alloy dust samples: S2. Heating and water leaching enrichment: The pretreated sample is mixed with the leaching medium at a liquid-solid ratio of 2:1-20:1 mL / g, and stirred and leached at 40-95℃ for 10-180 min to allow the water-soluble potassium and sodium components in the sample to enter the liquid phase, thereby increasing the amount of potassium and sodium elements dissolved in a unit volume of aqueous solution, thus reducing the amount of water used for leaching and the amount of wastewater discharged. S3. Solid-liquid separation: The slurry after water immersion is subjected to sedimentation, filtration, pressure filtration or centrifugation to obtain potassium and sodium leachate; S4. Cyclic enrichment: The obtained potassium and sodium-containing leachate is cyclically enriched or concentrated by evaporation. S5. Evaporation and crystallization: The enriched potassium-sodium leaching solution is evaporated and concentrated. When the solution reaches saturation or supersaturation and crystals precipitate, continue to keep it warm for crystallization or cool it for crystallization to obtain potassium-sodium crystalline products. S6. Crystal separation and drying: Solid-liquid separation is performed on the system after evaporation and crystallization to obtain potassium and sodium crystal products and crystallization mother liquor.
[0010] Furthermore: In S1, the silicon-manganese alloy dust sample includes a circulating sample and a non-circulating sample; the pretreatment includes one or more of microwave drying, baking, crushing, mixing and sieving to obtain a silicon-manganese alloy dust sample with relatively uniform particle size and moisture content.
[0011] Furthermore, in S2, the leaching medium used for water leaching enrichment is one or more of the following: clean water, industrial water, deionized water, recycled mother liquor from crystallization, or water leaching circulating liquid.
[0012] Further: In S2, the solid-liquid ratio is 3:1-10:1 mL / g, the water immersion temperature is 50-85℃, the water immersion time is 30-120min, and the stirring rate is 100-800 r / min.
[0013] Further: In S4, the cyclic enrichment is as follows: when the potassium and sodium concentrations in the leachate obtained from a single water leaching do not meet the requirements for evaporation and crystallization, the leachate is used as the leaching medium for the next batch of samples and continues to be water-leached under heating conditions, repeating the water leaching and solid-liquid separation process until the potassium and sodium concentrations, conductivity, density, or total dissolved solids content in the leachate meet the preset requirements for evaporation and crystallization.
[0014] Furthermore: In S4, the evaporation and concentration are carried out using one or more of the following methods: atmospheric pressure heating evaporation, reduced pressure evaporation, solar energy evaporation, low temperature waste heat evaporation, or waste heat evaporation from a smelting system.
[0015] Furthermore: In S4, the temperature of the evaporation crystallization is 50-110°C. When the leachate is concentrated to the point where crystal nuclei appear, reaches a saturated or supersaturated state, or reaches a predetermined concentration factor, it is subjected to heat preservation crystallization, cooling crystallization, or natural crystallization.
[0016] Furthermore: In S6, the potassium-sodium crystal product is washed and dried to obtain potassium-sodium salt product, and the crystallization mother liquor is returned to the water immersion or evaporation crystallization step for recycling.
[0017] In summary, the present invention has the following beneficial effects: Firstly, this invention uses water as the leaching medium to transfer the water-soluble potassium and sodium components in the silicon-manganese alloy flue dust to the liquid phase, avoiding the use of large amounts of acid and alkali reagents. This has the advantages of low process cost and low equipment corrosion risk. Simultaneously, by controlling the water leaching temperature within a suitable heating range, the solubility of potassium and sodium components in a unit volume of aqueous solution is increased, allowing more potassium and sodium elements to dissolve in the same volume of aqueous solution, thereby reducing water consumption and wastewater discharge. Furthermore… Secondly, this invention achieves the enrichment of potassium and sodium components in the leachate by heating and circulating water leaching, thereby improving the efficiency of subsequent evaporation and crystallization. It also processes circulating and non-circulating samples separately to avoid fluctuations in the composition of the leachate caused by direct mixing of dust from different sources, thus improving the stability of the crystallization process and the controllability of the product. Thirdly, this invention uses evaporation crystallization to recover potassium and sodium salts. The process is simple and can be combined with the utilization of waste heat in the plant area, which has good engineering adaptability and industrial promotion value. Attached Figure Description
[0018] Figure 1 This is an operation flowchart of the present invention; Figure 2 This is an experimental diagram of dust leaching in this invention; Figure 3 This is a compositional analysis diagram of the properties of the silicon-manganese alloy dust collector ash from this invention; Figure 4 This is an XRD analysis diagram of the flue dust from the smelting of silicon-manganese alloys according to this invention. Figure 5 This is an XRD analysis diagram of the flue dust from the smelting of silicon-manganese alloys that is recycled according to this invention. Figure 6 This is a particle size and distribution diagram of the flue dust from the smelting of silicon-manganese alloys according to the present invention; Figure 7 The figures (a), (b), and (c) are the residual histograms of the discrete points of moisture ratio with different initial masses, initial moisture content, and microwave output power of the present invention and the Modified Page model. Figure 8 These are comparison images of the soot (a) and (c) before drying and the soot (b) and (d) after drying according to the present invention. Detailed Implementation
[0019] The present invention will be further described in detail below with reference to the accompanying drawings.
[0020] In the description of this invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.
[0021] Example 1, referring to Figure 1-2 A method for water leaching enrichment and evaporation crystallization recovery of valuable potassium and sodium elements in silicon-manganese alloy flue dust includes the following steps: S1. Pre-treat the circulating silicon-manganese alloy dust sample by microwave drying, baking, crushing, mixing and sieving to obtain a silicon-manganese alloy circulating dust sample with relatively uniform particle size and moisture content. S2. Heating and water leaching enrichment: The pretreated circulating flue dust sample is mixed with the leaching medium at a liquid-solid ratio of 3:1-10:1 mL / g, and stirred at a stirring rate of 100-800 r / min for 30-120 min at 50-85℃. This allows the water-soluble potassium and sodium components in the sample to enter the liquid phase, thereby increasing the amount of potassium and sodium dissolved in the aqueous solution per unit volume, thus reducing the amount of water used for leaching and the amount of wastewater discharged.
[0022] The leaching medium is one or more of the following: clean water, industrial water, deionized water, recycled mother liquor from crystallization, or water leaching circulating liquid.
[0023] S3. Solid-liquid separation: Filter the slurry after water immersion to obtain a potassium-sodium leaching solution of the circulating sample. Use the obtained potassium-sodium leaching solution as the leaching medium and add a new batch of pretreated circulating sample. Perform a second water immersion at 50-85℃. Repeat the above water immersion and filtration process until the conductivity, density or potassium-sodium concentration of the leaching solution meets the requirements for evaporation and crystallization. S4. Cyclic enrichment: The obtained potassium and sodium leaching solution is concentrated by evaporation. The evaporation concentration is carried out by one or more of the following methods: atmospheric pressure heating evaporation, vacuum evaporation, solar evaporation, low temperature waste heat evaporation or waste heat evaporation of the smelting system. S5. Evaporation and crystallization: The enriched potassium and sodium leaching solution is placed in an evaporation container for evaporation and concentration. The evaporation and crystallization temperature is controlled at 60-105℃. When the leaching solution is concentrated to the point where crystal nuclei appear, reaches saturation or supersaturation, or reaches the predetermined concentration factor, it is subjected to heat preservation crystallization, cooling crystallization, or natural crystallization. S6. Crystal Separation and Drying: Solid-liquid separation is performed on the system after evaporation and crystallization to obtain potassium and sodium crystal products and crystallization mother liquor. The potassium and sodium crystal products are collected after washing and drying to obtain potassium and sodium salt products. The crystallization mother liquor is returned to the water leaching or evaporation crystallization step for recycling.
[0024] Example 2, a method for water leaching enrichment and evaporation crystallization recovery of valuable potassium and sodium elements in silicon-manganese alloy flue dust, comprising the following steps: S1. The non-circulating silicon-manganese alloy dust sample is pretreated by drying, crushing, mixing and sieving to obtain a non-circulating silicon-manganese alloy dust sample with relatively uniform particle size and moisture content. S2. Heating and water leaching enrichment: The pretreated non-circulating sample is mixed with the leaching medium at a liquid-solid ratio of 3:1-10:1 mL / g, and stirred at a stirring rate of 100-800 r / min for 30-120 min at 50-85℃. This allows the water-soluble potassium and sodium components in the sample to enter the liquid phase, thereby increasing the amount of potassium and sodium dissolved in the aqueous solution per unit volume, thus reducing the amount of water used for leaching and the amount of wastewater discharged.
[0025] The leaching medium is one or more of the following: clean water, industrial water, deionized water, recycled mother liquor from crystallization, or water leaching circulating liquid.
[0026] S3. Solid-liquid separation: The slurry after water immersion is settled and filtered to obtain a non-circulating sample containing potassium and sodium leachate. When the potassium and sodium concentrations in the leachate obtained from a single water immersion are low, the leachate is returned as a leaching medium. Fresh non-circulating samples are enriched by multi-stage circulating water immersion at 50-85℃ until the leachate meets the requirements for evaporation and crystallization. S4. Cyclic enrichment: The obtained potassium and sodium leaching solution is cyclically enriched. When the potassium and sodium concentrations in the leaching solution obtained from the first water leaching do not meet the requirements for evaporation and crystallization, the leaching solution is used as the leaching medium for the next batch of samples and water leaching is continued under heating conditions. The water leaching and solid-liquid separation process is repeated until the potassium and sodium concentrations, conductivity, density or total dissolved solids content in the leaching solution meet the preset requirements for evaporation and crystallization. S5. Evaporation and crystallization: The enriched potassium and sodium leaching solution is placed in an evaporation container for evaporation and concentration. The evaporation and crystallization temperature is 50-110℃. When the leaching solution is concentrated to the point where crystal nuclei appear, reaches saturation or supersaturation, or reaches the predetermined concentration multiple, it is subjected to heat preservation crystallization, cooling crystallization, or natural crystallization. S6. Crystal Separation and Drying: Solid-liquid separation is performed on the system after evaporation and crystallization to obtain potassium and sodium crystal products and crystallization mother liquor. The potassium and sodium crystal products are collected after washing and drying to obtain potassium and sodium salt products. The crystallization mother liquor is returned to the water leaching or evaporation crystallization step for recycling.
[0027] Example 3: A method for water leaching enrichment and evaporation crystallization recovery of valuable potassium and sodium elements in silicon-manganese alloy flue dust, comprising the following steps: S1. Pretreatment of silicon-manganese alloy dust samples: The silicon-manganese alloy dust samples include circulating samples and non-circulating samples, which are numbered separately, and then microwave dried, mixed and sieved to avoid mixing the two types of samples before water immersion. S2. Heating and water immersion enrichment: The two pretreated samples are mixed with the leaching medium at a liquid-solid ratio of 2:1-20:1 mL / g, and stirred and immersed in water at 40-95℃ for 10-180 min to obtain circulating and non-circulating water immersion solutions. S3. Circulating enrichment: The enrichment degree of circulating and non-circulating water leaching solutions are detected or judged separately; for leaching solutions with insufficient enrichment degree, they are returned to the corresponding sample system and circulated under heating conditions without cross-contamination. S4. Evaporation and crystallization: The circulating water leaching enrichment solution and the non-circulating water leaching enrichment solution that have reached the crystallization requirements are evaporated and crystallized to obtain the corresponding circulating potassium-sodium crystal products and non-circulating potassium-sodium crystal products. By employing the above methods, the leaching enrichment characteristics of potassium and sodium water-soluble components in circulating and non-circulating samples can be separately determined, avoiding fluctuations in leachate composition and instability in the crystallization process caused by direct mixing of dust from different sources. Simultaneously, by controlling the water leaching temperature within a suitable heating range, more potassium and sodium elements can be dissolved in the same volume of solution, thereby reducing the total volume of the leachate and lowering wastewater discharge and subsequent evaporation treatment load.
[0028] Example 4: A method for water leaching enrichment and evaporation crystallization recovery of valuable potassium and sodium elements in silicon-manganese alloy flue dust, comprising the following steps: S1. The silicon-manganese alloy dust sample was subjected to water immersion and solid-liquid separation under heating conditions to obtain a potassium-sodium leachate.
[0029] S2. The potassium-sodium leachate is evaporated and concentrated until crystals precipitate. The potassium-sodium crystals and the mother liquor are obtained by solid-liquid separation.
[0030] S3. Return the crystallization mother liquor to the water leaching step and use it as the leaching medium for the next batch of silicon-manganese alloy dust samples under heating conditions.
[0031] S4. Repeated heating and water immersion, solid-liquid separation, evaporation and crystallization, and mother liquor reuse process to achieve water resource recycling and continuous enrichment of potassium and sodium components.
[0032] This embodiment reduces the amount of liquid discharged and improves water resource utilization by reusing the crystallization mother liquor. Simultaneously, controlling the water immersion temperature within the heating range helps increase the concentration of potassium and sodium components per unit volume of solution, reducing wastewater discharge and lowering the liquid treatment scale of the subsequent evaporation and crystallization process.
[0033] Setting up experiments 1. Study on the occurrence state and phase composition of silicon-manganese alloy dust collector ash; Reference Figure 3 The composition table shows that, in addition to high levels of manganese and silicon, potassium and zinc are also present in high amounts, especially potassium. This is likely because the mineral raw materials contain a certain amount of potassium, and potassium compounds, due to their low density, mainly accumulate in the upper layer of the molten metal and are easily volatilized into the flue gas. The high levels of manganese and silicon, which are product elements, can be recycled and reused in the smelting process to transform them into silicon-manganese alloy products.
[0034] 2. Pretreatment of silicon-manganese alloy dust collector 2.1 Analyze the physical composition of the sample using an X-ray diffractometer; Compositional analysis of flue dust from smelting silicon-manganese alloys (reference) Figure 4 The compositional analysis of flue dust from the recycling of silicon-manganese alloys was referenced. Figure 5 .
[0035] 2.2. The sample was analyzed using a particle size analyzer. The particle size and distribution of the flue dust from smelting silicon-manganese alloys were determined by referring to... Figure 6 ; The particle size distribution of flue dust from smelting silicon-manganese alloys is shown in Table 1. Its particle size ranges from 0.592 µm to 3.3 µm, with a median particle size of 1.424 µm.
[0036] 2.3 The elements and their contents in the flue dust from the smelting of silicon-manganese alloy were analyzed using a fluorescence spectrometer, as shown in Table 2; Table 2. Chemical elements (wt.%) of flue dust from smelting silicon-manganese alloys. Results analysis: It can be easily observed that the manganese content is as high as 27.885%, the silicon content is 4.845%, and there are also valuable metals such as Zn, Cu, and Pb, which have high recycling value.
[0037] 3. Taking the flue dust generated during the refining of silicon-manganese alloys as the research object, this study systematically explores the effects of different microwave output powers, initial mass, and initial moisture content on it. The changes in moisture ratio for each group of variables are used to fit the Modifiedpage, Wang and singh, Quadratic, and Two-term exponential kinetic models, as shown in Tables 3-5 and... Figure 7 Tables 3-5 all use four kinetic models—Modified Page, Wang and singh, Quadratic, and Two-term exponential—to obtain relevant parameters for the moisture ratio change data under the three variables.
[0038] Table 3. Relevant parameters obtained from the data on changes in moisture ratio at different initial masses. Table 4. Relevant parameters obtained from the data on changes in moisture ratio at different initial moisture contents. Table 5. Relevant parameters obtained from the moisture ratio variation data of microwave power. Results Analysis: From the fitted data (R², RSS, F), it was found that the Modified Page is most suitable for describing the dehydration law of flue dust in the smelting of silicon-manganese alloys under microwave heating conditions. The Modified Page was used to fit the set variables, and it was found that the model basically coincides with the discrete points on the plane. Figure 7 (a), (b), (c)).
[0039] At the same time, such as Figure 7As shown in (d), (e), and (f), the residual histograms of the model exhibit a normal distribution. The peak values of the standard distribution curves for each group of variables occur in the same interval, indicating that the Modified Page model is suitable for describing the microwave drying process of samples.
[0040] 4. Perform scanning electron microscopy on the samples before and after drying, referring to... Figure 8 As can be seen, both the samples before and after drying are spherical. The sample before drying has obvious gaps. In contrast, the sample after drying has larger particles, no clumping, and significantly smaller gaps. This indicates that some of the energy absorbed by the water molecules in the gaps is converted into steam power, transporting the water molecules to the surface, where they evaporate, thus reducing the size of the gaps.
[0041] Meanwhile, the reduced gap size also demonstrates that microwaves can effectively remove water molecules. Comparing the dried sample with the undried sample revealed a decrease in the peak value of the -OH peak after drying, indicating that microwave drying is a successful method for removing water molecules.
[0042] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make inventive modifications to this embodiment as needed, but as long as they are within the scope of the claims of the present invention, they are protected by patent law.
Claims
1. A method for the water leaching enrichment and evaporation crystallization recovery of valuable potassium and sodium elements in silicon-manganese alloy flue dust, characterized in that, Includes the following steps: S1. Pretreatment of silicon-manganese alloy dust samples: S2. Heating and water leaching enrichment: The pretreated sample is mixed with the leaching medium at a liquid-solid ratio of 2:1-20:1 mL / g, and stirred and leached at 40-95℃ for 10-180 min to allow the water-soluble potassium and sodium components in the sample to enter the liquid phase, thereby increasing the amount of potassium and sodium elements dissolved in a unit volume of aqueous solution, thus reducing the amount of water used for leaching and the amount of wastewater discharged. S3. Solid-liquid separation: The slurry after water immersion is subjected to sedimentation, filtration, pressure filtration or centrifugation to obtain potassium and sodium leachate; S4. Cyclic enrichment: The obtained potassium and sodium-containing leachate is cyclically enriched or concentrated by evaporation. S5. Evaporation and crystallization: The enriched potassium-sodium leaching solution is evaporated and concentrated. When the solution reaches saturation or supersaturation and crystals precipitate, continue to keep it warm for crystallization or cool it for crystallization to obtain potassium-sodium crystalline products. S6. Crystal separation and drying: Solid-liquid separation is performed on the system after evaporation and crystallization to obtain potassium and sodium crystal products and crystallization mother liquor.
2. The method for water leaching enrichment and evaporation crystallization recovery of valuable elements such as potassium and sodium in silicon-manganese alloy flue dust according to claim 1, characterized in that: In S1, the silicon-manganese alloy dust sample includes a circulating sample and a non-circulating sample; the pretreatment includes one or more of microwave drying, baking, crushing, mixing and sieving to obtain a silicon-manganese alloy dust sample with relatively uniform particle size and moisture content.
3. The method for water leaching enrichment and evaporation crystallization recovery of valuable elements such as potassium and sodium in silicon-manganese alloy flue dust according to claim 1, characterized in that: In S2, the leaching medium used for water leaching enrichment is one or more of the following: clean water, industrial water, deionized water, recycled mother liquor from crystallization, or water leaching circulating liquid.
4. The method for water leaching enrichment and evaporation crystallization recovery of valuable elements such as potassium and sodium in silicon-manganese alloy flue dust according to claim 1, characterized in that: In S2, the solid-liquid ratio is 3:1-10:1 mL / g, the water immersion temperature is 50-85℃, the water immersion time is 30-120min, and the stirring rate is 100-800 r / min.
5. The method for water leaching enrichment and evaporation crystallization recovery of valuable elements such as potassium and sodium in silicon-manganese alloy flue dust according to claim 1, characterized in that: In S4, the cyclic enrichment is as follows: when the potassium and sodium concentrations in the leachate obtained from a single water leaching do not meet the requirements for evaporation and crystallization, the leachate is used as the leaching medium for the next batch of samples and water leaching continues under heating conditions. The water leaching and solid-liquid separation process is repeated until the potassium and sodium concentrations, conductivity, density, or total dissolved solids content in the leachate meet the preset requirements for evaporation and crystallization.
6. The method for water leaching enrichment and evaporation crystallization recovery of valuable elements such as potassium and sodium in silicon-manganese alloy flue dust according to claim 1, characterized in that: In S4, the evaporation and concentration are carried out by one or more of the following methods: atmospheric pressure heating evaporation, reduced pressure evaporation, solar evaporation, low temperature waste heat evaporation, or waste heat evaporation from the smelting system.
7. The method for water leaching enrichment and evaporation crystallization recovery of valuable elements such as potassium and sodium in silicon-manganese alloy flue dust according to claim 1, characterized in that: In S4, the temperature of the evaporation crystallization is 50-110°C. When the leachate is concentrated to the point where crystal nuclei appear, reaches a saturated or supersaturated state, or reaches a predetermined concentration factor, it is subjected to heat preservation crystallization, cooling crystallization, or natural crystallization.
8. The method for water leaching enrichment and evaporation crystallization recovery of valuable elements such as potassium and sodium in silicon-manganese alloy flue dust according to claim 1, characterized in that: In step S6, the potassium-sodium crystal product is washed and dried to obtain potassium-sodium salt product, and the crystallization mother liquor is returned to the water immersion or evaporation crystallization step for recycling.