CN211733872U - Impurity removing device for soluble manganese salt solution - Google Patents
Impurity removing device for soluble manganese salt solution Download PDFInfo
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Abstract
The utility model provides an impurity removing device for soluble manganese salt solution. Impurity ions in the soluble manganese salt solution include calcium ions and magnesium ions, and the impurity removal device includes: the device comprises an evaporation concentration unit, a precipitation device and a first solid-liquid separation device, wherein the evaporation concentration unit is provided with a first feed inlet and a first liquid phase outlet, and the first feed inlet is used for adding a soluble manganese salt solution; the precipitation device is provided with a precipitant inlet, a second feed inlet and a precipitation product system outlet, and the second feed inlet is communicated with the first liquid phase outlet; and the first solid-liquid separation device is provided with a precipitation product system inlet, and the precipitation product system inlet is communicated with the precipitation product system outlet through a precipitation product system conveying pipeline. Through the combination of the evaporation concentration unit and the precipitation device, the removal rate of calcium and magnesium impurities in the manganese sulfate solution can be greatly improved, the more effective operation of a manganese sulfate solution impurity removal system is realized, the impurity removal process flow is shortened, the cost is reduced, and the like.
Description
Technical Field
The utility model relates to a manganese salt production field particularly, relates to an edulcoration device of soluble manganese salt solution.
Background
High-purity manganese sulfate serving as one of the raw materials for synthesizing the lithium nickel cobalt manganese oxide ternary cathode material and the lithium manganate cathode material of the battery becomes a research hotspot of the manganese industry at present. In recent years, the requirement on the purity of manganese sulfate is higher and higher, and the removal of calcium and magnesium is always a great problem in the production of high-purity manganese sulfate. The existing impurity removal process of soluble manganese salt mainly comprises the following steps: chemical precipitation, physical adsorption, displacement, crystallization, and the like are mainly chemical precipitation, and most precipitants are fluorides such as ammonium fluoride. However, new impurity ions are usually introduced in the chemical precipitation method, and the formed calcium fluoride and magnesium fluoride particles are too fine, have too high viscosity and are not easy to filter, so that the engineering problem in the actual production is difficult to solve.
The prior document (CN101875507A) reports that a traditional high-purity manganese sulfate production process comprises the step of adding ferric sulfate and manganese fluoride in sequence to remove calcium, magnesium, potassium and other ions. The method has the disadvantages of relatively long impurity removal process and unsatisfactory impurity removal effect. Another prior document (CN103112901A) provides a method for reducing the content of Ca, Mg, K and Na ions in manganese sulphate, which comprises adding FeF3And seed crystal of sodium iron vanadium or potassium iron vanadium to remove calcium, magnesium, potassium, sodium and other ions. The method has low removal degree of calcium and magnesium ions, and can not effectively obtain high-purity manganese sulfate.
Therefore, the development of a soluble manganese salt system purification system with low cost, environmental protection, high efficiency and energy saving has important practical significance and research value.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a edulcoration device of soluble manganese salt solution to there is the unsatisfactory problem of edulcoration effect in the edulcoration device of solving current soluble manganese salt solution.
In order to realize the above object, the utility model provides an impurity removal device of soluble manganese salt solution, impurity ion in the soluble manganese salt solution includes calcium ion and magnesium ion, and above-mentioned impurity removal device includes: the device comprises an evaporation concentration unit, a precipitation device and a first solid-liquid separation device, wherein the evaporation concentration unit is provided with a first feed inlet and a first liquid phase outlet, and the first feed inlet is used for adding a soluble manganese salt solution; the precipitation device is provided with a precipitant inlet, a second feed inlet and a precipitation product system outlet, and the second feed inlet is communicated with the first liquid phase outlet; and the first solid-liquid separation device is provided with a precipitation product system inlet, and the precipitation product system inlet is communicated with the precipitation product system outlet through a precipitation product system conveying pipeline.
Further, the evaporation concentration unit includes: the evaporation concentration device is provided with a first feed inlet and a concentrated solution outlet; the second solid-liquid separation device is provided with a concentrated solution inlet and a first liquid phase outlet, and the concentrated solution inlet is communicated with the concentrated solution outlet through a concentrated solution conveying pipeline.
Further, the edulcoration device still includes: the device comprises a soluble manganese salt solution supply device and a heating unit, wherein the soluble manganese salt solution supply device is provided with a soluble manganese salt supply port, and the solution supply port is communicated with a first feed port through a soluble manganese salt solution conveying pipeline; the heating unit is used for heating the soluble manganese salt solution in the soluble manganese salt solution conveying pipeline.
Further, the heating unit comprises a preheating device and a heating device, and the preheating device and the heating device are sequentially arranged on the soluble manganese salt solution conveying pipeline along the flowing direction of the materials in the soluble manganese salt solution conveying pipeline.
Further, the heating unit comprises a preheating device and a heating device, and the preheating device and the heating device are sequentially sleeved outside the soluble manganese salt solution conveying pipeline along the flowing direction of the materials in the soluble manganese salt solution conveying pipeline.
Further, the edulcoration device still includes: the pH regulator mixing device comprises a pH regulator supply device and a mixing device, wherein the pH regulator supply device is provided with a pH regulator supply port; the mixing device is provided with a pH regulator inlet which is communicated with a pH regulator supply port, and the mixing device is arranged on a soluble manganese salt solution conveying pipeline between the heating unit and the evaporation concentration unit.
Further, the first solid-liquid separation device is a membrane filtration device.
Further, the precipitation device is also provided with a seed crystal inlet, and the impurity removal device further comprises a seed crystal supply device which is provided with a seed crystal supply port communicated with the seed crystal inlet.
Further, the evaporation concentration device is provided with a steam outlet, and the evaporation concentration unit further comprises a steam recovery device which is communicated with the steam outlet and used for recovering steam discharged from the evaporation concentration device.
Furthermore, the first solid-liquid separation device is provided with a first solid phase outlet, the second solid-liquid separation device is provided with a second solid phase outlet, and the impurity removal device further comprises a solid waste treatment device which is respectively communicated with the first solid phase outlet and the second solid phase outlet and is used for treating solid phase impurities generated in the impurity removal process.
By applying the technical scheme of the utility model, firstly, the soluble manganese salt solution passes through the evaporation concentration unit, so that the soluble manganese salt solution is evaporated and concentrated to obtain the concentrated solution, most of impurities such as calcium, magnesium and the like can be removed preliminarily, the dosage of the impurity removing agent is greatly reduced, and the process cost is favorably reduced; and then the concentrated solution reacts with a precipitator (such as little fluoride) in a precipitation device to remove the residual trace calcium and magnesium ions in the manganese sulfate solution. Therefore, the evaporation concentration unit is combined with the precipitation device, so that the removal rate of calcium and magnesium impurities in the manganese sulfate solution can be greatly improved, the more effective operation of the manganese sulfate solution impurity removal system is realized, the impurity removal process flow is shortened, the cost is reduced, and the like.
Drawings
The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 shows a schematic structure of an exemplary impurity removing device for a soluble manganese salt solution according to the present invention; and
fig. 2 shows a schematic structural diagram of a preferred impurity removing device for a soluble manganese salt solution according to the present invention.
Wherein the figures include the following reference numerals:
10. an evaporation concentration unit; 11. an evaporation concentration device; 12. a second solid-liquid separation device; 20. a precipitation device; 21. a seed crystal supply device; 30. a first solid-liquid separation device; 40. a heating unit; 41. a preheating device; 42. a heating device; 50. a soluble manganese salt solution supply device; 51. a mixing device; 52. a pH adjuster supply device; 60. a vapor recovery device; 70. a solid waste treatment device; 80. purified manganese salt storage device.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail with reference to examples.
As described in the background art, the existing impurity removal device for the soluble manganese salt solution has the problem of unsatisfactory impurity removal effect. In order to solve the above technical problem, the present application provides an impurity removing device for a soluble manganese salt solution, wherein impurity ions in the soluble manganese salt solution include calcium ions and magnesium ions, as shown in fig. 1, the impurity removing device includes: the device comprises an evaporation concentration unit 10, a precipitation device 20 and a first solid-liquid separation device 30, wherein the evaporation concentration unit 10 is provided with a first feed inlet and a first liquid phase outlet, and the first feed inlet is used for adding a soluble manganese salt solution; the precipitation device 20 is provided with a precipitant inlet, a second feed inlet and a precipitation product system outlet, and the second feed inlet is communicated with the first liquid phase outlet; and the first solid-liquid separation device 30 is provided with a precipitated product system inlet, and the precipitated product system inlet is communicated with the precipitated product system outlet through a precipitated product system conveying pipeline.
Firstly, the soluble manganese salt solution passes through an evaporation concentration unit 10, so that the soluble manganese salt solution is evaporated and concentrated to obtain a concentrated solution, most of impurities such as calcium, magnesium and the like can be removed preliminarily, the dosage of an impurity removing agent is greatly reduced, and the process cost is favorably reduced; then the concentrated solution reacts with a precipitator (such as little fluoride) in a precipitation device 20 to remove the residual trace calcium and magnesium ions in the manganese sulfate solution. Therefore, the evaporation concentration unit 10 is combined with the precipitation device 20, so that the removal rate of calcium and magnesium impurities in the manganese sulfate solution can be greatly improved, the more effective operation of the manganese sulfate solution impurity removal system is realized, the impurity removal process flow is shortened, the cost is reduced, and the like.
In a preferred embodiment, as shown in FIG. 2, the evaporative concentration unit 10 includes: the device comprises an evaporation concentration device 11 and a second solid-liquid separation device 12, wherein the evaporation concentration device 11 is provided with a first feeding hole and a concentrated solution outlet; the second solid-liquid separation device 12 is provided with a concentrated solution inlet and a first liquid phase outlet, and the concentrated solution inlet is communicated with the concentrated solution outlet through a concentrated solution conveying pipeline.
Carrying out evaporation concentration on the soluble manganese salt solution by an evaporation concentration device 11 to obtain a solid-liquid mixture concentrated solution and precipitated crystals; carrying out solid-liquid separation on the solid-liquid mixture in a second solid-liquid separation device 12 to obtain a primary purified concentrated solution; it is then conveyed to a subsequent precipitation device 20 for further impurity removal.
In a preferred embodiment, as shown in fig. 2, the trash removing device further includes: the device comprises a soluble manganese salt solution supply device 50 and a heating unit 40, wherein the soluble manganese salt solution supply device 50 is provided with a soluble manganese salt supply port, and the solution supply port is communicated with a first feed inlet through a soluble manganese salt solution conveying pipeline; the heating unit 40 is used for heating the soluble manganese salt solution in the soluble manganese salt solution conveying pipeline.
The soluble manganese salt solution supply device 50 is arranged and communicated with the first feed inlet of the evaporation concentration unit 10, so that the labor intensity in the impurity removal process is reduced, and the flow is simplified. The heating unit 40 is beneficial to improving the heat exchange effect of the materials in the evaporation concentration unit 10, thereby being beneficial to improving the removal rate of impurity elements.
In a preferred embodiment, as shown in fig. 2, the heating unit 40 comprises a preheating device 41 and a heating device 42, and the preheating device 41 and the heating device 42 are sequentially disposed on the soluble manganese salt solution conveying line in the flow direction of the material in the soluble manganese salt solution conveying line; in another preferred embodiment, the heating unit 40 comprises a preheating device 41 and a heating device 42, and the preheating device 41 and the heating device 42 are sequentially sleeved outside the soluble manganese salt solution conveying pipeline along the flowing direction of the materials in the soluble manganese salt solution conveying pipeline.
The preheating device 41 simply preheats the solution to a lower temperature and then continues to heat to a higher temperature with the heating device 42. The mode of combining the preheating device 41 and the heating device 42 is favorable for further improving the heat exchange effect of the materials in the evaporation concentration unit 10, so that the impurity content in the concentrated solution is further reduced. More preferably, the preheating device 41 preheats the steam or the like used by the heating device 42, thereby saving energy.
In a preferred embodiment, as shown in fig. 2, the trash removing device further includes: a pH adjuster supply device 52 and a mixing device 51, the pH adjuster supply device 52 being provided with a pH adjuster supply port; the mixing device 51 is provided with a pH adjuster inlet which communicates with the pH adjuster supply port, and the mixing device 51 is provided on the soluble manganese salt solution transfer line between the heating unit 40 and the evaporation concentration unit 10. The soluble manganese salt solution and the pH adjusting agent provided by the pH adjusting agent supply device 52 are mixed in the mixing device 51, so that the pH of the soluble manganese salt solution can be effectively adjusted, the increase of the precipitation rate of the impurity ions in the evaporation concentration unit 10 is facilitated, and the effect of further removing the impurity elements is realized.
In order to further enhance the separation effect of the first solid-liquid separation device 30, the first solid-liquid separation device 30 is preferably a membrane filtration device.
In a preferred embodiment, the precipitation device 20 is further provided with a seed inlet, the impurity removal device further comprises a seed supply device 21, the seed supply device 21 is provided with a seed supply port, and the seed supply port is in communication with the seed inlet. In the precipitation device 20, the precipitant converts impurity ions in the soluble manganese salt into precipitate, the seed crystal supply device 21 communicated with the precipitation device 20 is arranged, and the seed crystal is added into the precipitation device 20 to promote the rapid generation of calcium fluoride and magnesium fluoride precipitate, thereby being beneficial to the growth of precipitated crystals, greatly shortening the standing and settling time and improving the filtering performance.
In a preferred embodiment, the evaporative concentration unit 11 is provided with a vapor outlet, and the evaporative concentration unit 10 further comprises a vapor recovery device 60, the vapor recovery device 60 being in communication with the vapor outlet for recovering the vapor discharged from the evaporative concentration unit 11. A large amount of steam can be generated in the evaporation concentration process, redundant steam generated in the evaporation concentration process is recovered through the steam recovery device 60, and the steam can be used as circulating water after being cooled, so that the utilization rate of resources can be improved.
In a preferred embodiment, the first solid-liquid separation device 30 is provided with a first solid phase outlet, the second solid-liquid separation device 12 is provided with a second solid phase outlet, and the impurity removing device further comprises a solid waste treatment device 70, wherein the solid waste treatment device 70 is respectively communicated with the first solid phase outlet and the second solid phase outlet and is used for treating solid phase impurities generated in the impurity removing process. The solid phase impurities discharged from the first solid-liquid separation device 30 and the second solid-liquid separation device 12 can be discharged into the solid waste treatment device 70 to recover the magnesium sulfate therein, thereby improving the economic value thereof.
Preferably, the first solid phase separation device is provided with a second liquid phase outlet, and the impurity removing device further comprises a purified manganese salt storage device 80, wherein the purified manganese salt storage device 80 is communicated with the second liquid phase outlet and is used for storing the purified manganese salt solution.
Another aspect of the present application further provides an impurity removing method for a soluble manganese salt solution, where impurity ions in the soluble manganese salt solution include calcium ions and magnesium ions, the impurity removing method including: evaporating and concentrating the soluble manganese salt solution to obtain a concentrated solution; and carrying out precipitation reaction and a first solid-liquid separation process on the concentrated solution and a precipitator so as to remove impurities in the soluble manganese salt solution.
Firstly, evaporating and concentrating a soluble manganese salt solution to obtain a concentrated solution, and primarily removing most of impurities such as calcium, magnesium and the like, so that the dosage of an impurity removing agent is greatly reduced; and then reacting the concentrated solution with a precipitator (such as little fluoride) to remove residual trace calcium and magnesium ions in the manganese sulfate solution. Therefore, the removal rate of calcium and magnesium impurities in the manganese sulfate solution can be greatly improved by combining evaporation concentration and precipitation treatment, the more effective operation of a manganese sulfate solution impurity removal system is realized, the impurity removal process flow is shortened, the dosage of an impurity removal agent which is high in harm and high in price is reduced, and the cost is reduced.
In a preferred embodiment, before the evaporation concentration process, the impurity removal method comprises: and adjusting the pH of the soluble manganese salt solution to 2.0-5.0 by adopting a pH regulator. The pH regulator is adopted to regulate the pH of the soluble manganese salt solution to the range, which is beneficial to improving the precipitation rate of impurity ions in the evaporation concentration unit 10, thereby realizing the effect of further removing impurity elements. Preferably, the concentration of the soluble manganese salt in the concentrated solution is 100-200 g/L. Compared with other ranges, limiting the concentration of the soluble manganese salt in the concentrated solution in the range is beneficial to further improving the crystallization rate in the evaporation concentration process, thereby being beneficial to further improving the removal rate of impurity elements.
In a preferred embodiment, the precipitation agent is manganese fluoride. Compared with other precipitants, the adoption of the precipitant to participate in the precipitation reaction can not introduce new impurity ions, and simultaneously can reduce the content of residual fluorine elements in the solution. Preferably, the amount of calcium ions and magnesium ions in the concentrated solution which are completely precipitated is used as the theoretical amount of the precipitating agent, and the actual amount of the precipitating agent is 1-4 times of the theoretical amount of the precipitating agent. Compared with other ranges, limiting the actual dosage of the precipitating agent in the range is beneficial to improving the precipitation rate of impurity ions, and further improving the removal rate of impurities in the soluble manganese salt.
When manganese fluoride is used as a precipitator, the reaction principle in the precipitation reaction process is as follows:
Ca2++2F-→CaF2↓Ksp＝2.7×10-11，Mg2++2F-→MgF2↓Ksp＝6.4×10-9。
in a preferred embodiment, the precipitation reaction process further comprises: mixing the concentrated solution with water for dilution to obtain a standby sample solution, wherein the concentration of soluble manganese salt in the standby sample solution is 20-100 g/L; and reacting the standby sample solution with a precipitator to remove impurities in the soluble manganese salt solution. Limiting the concentration of the soluble manganese salt in the range is beneficial to improving the impurity removal efficiency.
In a preferred embodiment, the impurity removing method further includes: calcium fluoride seed crystals are added during the precipitation reaction. The addition of the crystal seed can promote the rapid generation of calcium fluoride and magnesium fluoride precipitates, is favorable for the growth of precipitated crystals, can greatly shorten the standing and settling time and improve the filtering performance. More preferably, the weight of the calcium fluoride seed crystal accounts for 1-10 wt% of the weight of the soluble manganese salt. Limiting the amount of calcium fluoride seed crystals to the above range is advantageous in further increasing the rate of formation of calcium fluoride and magnesium fluoride precipitates as compared to other ranges.
In a preferred embodiment, the soluble manganese salt includes, but is not limited to, manganese sulfate and/or manganese chloride.
The temperature and stirring speed of the evaporation concentration process can be set according to actual requirements. In a preferred embodiment, the temperature of the evaporation concentration process is 40-90 ℃, and the stirring speed is 100-400 r/min. The limitation of the temperature and the stirring speed in the evaporation concentration process in the above range is beneficial to improving the efficiency of evaporation concentration and the removal rate of impurity elements.
The present application is described in further detail below with reference to specific examples, which should not be construed as limiting the scope of the invention as claimed.
Example 1
The impurity elements in the manganese sulfate solution were removed in the apparatus shown in FIG. 1.
Preparing a manganese sulfate solution with the Mn content of 10g/L, the Mg content of 0.3g/L and the Ca content of 0.2g/L, and determining the actual content of each ion in the manganese sulfate solution through atomic absorption.
And (3) inputting the manganese sulfate solution into a preheating device 41 for two-stage preheating treatment, heating the preheated solution to 60 ℃, conveying the solution to a heating device 42 through a preheated solution outlet pipe for secondary heating, and heating the manganese sulfate solution to a set temperature. Then, it was transferred to a mixing device 51, and the pH of the manganese sulfate solution was adjusted to 2.0 with 1mol/L sulfuric acid.
Conveying the manganese sulfate solution with the pH value of 2.0 to an evaporation concentration device 11, carrying out evaporation concentration on the heated material (at 90 ℃) through the evaporation concentration device 11, and then entering a second solid-liquid separation device 12 (a filtering device) to obtain a concentrated solution and a first solid precipitate. The filtered first solid precipitate enters the solid waste treatment device 70 through a solid impurity discharge pipe for solid waste treatment.
The concentrated solution is conveyed to a precipitation device 20 to perform precipitation reaction with a precipitator (manganese fluoride), wherein the reagent dosage of the precipitator is 2 times of the theoretical dosage. Meanwhile, in the process of the precipitation reaction, newly-generated calcium fluoride seed crystals (the dosage is 5 wt% of the weight of manganese sulfate) are slowly added into the precipitation device 20, stirred at the stirring speed of 100r/min for 2 hours, and kept stand at the constant temperature for 2 hours. And conveying the precipitated product system to a first solid-phase separation device (membrane filtration device) for solid-liquid separation to obtain a purified manganese sulfate solution and a second solid precipitate. And feeding the purified manganese sulfate solution into a purified manganese sulfate storage device to obtain the finally purified high-purity manganese sulfate solution. And (3) concentrating the purified high-purity manganese sulfate solution at normal pressure, crystallizing, dehydrating and drying to obtain a manganese sulfate solid. Through tests, the calcium ion concentration in the high-purity manganese sulfate solution is less than 1ppm, and the Mg ion concentration is 2 ppm. The second solid precipitate enters the solid waste treatment device 70 through a solid impurity discharge pipe for solid waste treatment.
Example 2
The differences from example 1 are: the pH of the manganese sulfate solution is adjusted without using a pH adjuster.
Example 3
The differences from example 1 are: the concentrated solution is diluted with water until the concentration of manganese sulfate is 50 g/L.
Example 4
The differences from example 1 are: no seed crystal is added during the precipitation reaction.
Comparative example 1
The differences from example 1 are: no chemical precipitation reaction process is performed.
Comparative example 2
The differences from example 1 are: no evaporative concentration process was performed.
In examples 1 to 4 and comparative examples 1 to 2, the contents of elements before and after removing impurities from the magnesium sulfate solution are shown in table 1 below.
TABLE 1
From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects: through the combination of the evaporation concentration unit and the precipitation device, the removal rate of calcium and magnesium impurities in the manganese sulfate solution can be greatly improved, the more effective operation of a manganese sulfate solution impurity removal system is realized, the impurity removal process flow is shortened, the cost is reduced, and the like.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An impurity removing device for a soluble manganese salt solution, wherein impurity ions in the soluble manganese salt solution comprise calcium ions and magnesium ions, and the impurity removing device comprises:
the device comprises an evaporation concentration unit (10), wherein the evaporation concentration unit (10) is provided with a first feeding port and a first liquid phase outlet, and the first feeding port is used for adding the soluble manganese salt solution;
the sedimentation device (20), the sedimentation device (20) is provided with a precipitant inlet, a second feed inlet and a sedimentation product system outlet, and the second feed inlet is communicated with the first liquid phase outlet; and
the device comprises a first solid-liquid separation device (30), wherein the first solid-liquid separation device (30) is provided with a precipitation product system inlet, and the precipitation product system inlet is communicated with a precipitation product system outlet through a precipitation product system conveying pipeline.
2. The trash removal device of claim 1, wherein the evaporative concentration unit (10) comprises:
the evaporation concentration device (11), the evaporation concentration device (11) is provided with the first feed inlet and a concentrated solution outlet;
and the second solid-liquid separation device (12), the second solid-liquid separation device (12) is provided with a concentrated solution inlet and the first liquid phase outlet, and the concentrated solution inlet is communicated with the concentrated solution outlet through a concentrated solution conveying pipeline.
3. The trash removal device of claim 2, further comprising:
the device comprises a soluble manganese salt solution supply device (50), wherein the soluble manganese salt solution supply device (50) is provided with a soluble manganese salt supply port, and the solution supply port is communicated with the first feeding port through a soluble manganese salt solution conveying pipeline;
a heating unit (40), wherein the heating unit (40) is used for heating the soluble manganese salt solution in the soluble manganese salt solution conveying pipeline.
4. A edulcoration apparatus according to claim 3, characterized in that the heating unit (40) comprises a preheating device (41) and a heating device (42), and that the preheating device (41) and the heating device (42) are arranged in sequence on the soluble manganese salt solution conveying line in the flow direction of the material in the soluble manganese salt solution conveying line.
5. A edulcoration apparatus according to claim 3, characterized in that the heating unit (40) comprises a preheating device (41) and a heating device (42), and the preheating device (41) and the heating device (42) are successively fitted over the outside of the soluble manganese salt solution conveying line in the flow direction of the material in the soluble manganese salt solution conveying line.
6. A trash device according to claim 3 or 4, further comprising:
a pH adjuster supply device (52), the pH adjuster supply device (52) being provided with a pH adjuster supply port;
a mixing device (51), the mixing device (51) being provided with a pH adjuster inlet in communication with the pH adjuster supply port, the mixing device (51) being provided on the soluble manganese salt solution delivery line between the heating unit (40) and the evaporative concentration unit (10).
7. The edulcoration apparatus according to claim 1 or 2, characterized in that the first solid-liquid separation device (30) is a membrane filtration device.
8. A edulcoration apparatus according to any one of claims 1 to 4, characterized in that the precipitation device (20) is further provided with a seed inlet, the edulcoration apparatus further comprising a seed supply device (21), the seed supply device (21) being provided with a seed supply port, the seed supply port communicating with the seed inlet.
9. A trash extraction device according to claim 2, characterized in that the evaporation concentration device (11) is provided with a steam outlet, and the evaporation concentration unit (10) further comprises a steam recovery device (60), the steam recovery device (60) being in communication with the steam outlet for recovering steam discharged from the evaporation concentration device (11).
10. The impurity removing device according to claim 9, wherein the first solid-liquid separating device (30) is provided with a first solid phase outlet, the second solid-liquid separating device (12) is provided with a second solid phase outlet, the impurity removing device further comprises a solid waste treatment device (70), and the solid waste treatment device (70) is respectively communicated with the first solid phase outlet and the second solid phase outlet and is used for treating solid phase impurities generated in the impurity removing process.
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