CN105211829A - A kind of preparation method of deep-well salt - Google Patents
A kind of preparation method of deep-well salt Download PDFInfo
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- CN105211829A CN105211829A CN201510600168.0A CN201510600168A CN105211829A CN 105211829 A CN105211829 A CN 105211829A CN 201510600168 A CN201510600168 A CN 201510600168A CN 105211829 A CN105211829 A CN 105211829A
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- 150000003839 salts Chemical class 0.000 title claims abstract description 41
- 238000002360 preparation method Methods 0.000 title claims abstract description 21
- 241001131796 Botaurus stellaris Species 0.000 claims abstract description 101
- 230000000694 effects Effects 0.000 claims abstract description 28
- 238000003756 stirring Methods 0.000 claims abstract description 22
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 21
- 238000010438 heat treatment Methods 0.000 claims abstract description 19
- 238000005374 membrane filtration Methods 0.000 claims abstract description 19
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 17
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 14
- 238000001704 evaporation Methods 0.000 claims abstract description 12
- 230000008020 evaporation Effects 0.000 claims abstract description 12
- 239000012267 brine Substances 0.000 claims abstract description 10
- 239000007788 liquid Substances 0.000 claims abstract description 10
- 239000011780 sodium chloride Substances 0.000 claims abstract description 10
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims abstract description 10
- 239000002245 particle Substances 0.000 claims abstract description 9
- WDIHJSXYQDMJHN-UHFFFAOYSA-L barium chloride Chemical compound [Cl-].[Cl-].[Ba+2] WDIHJSXYQDMJHN-UHFFFAOYSA-L 0.000 claims abstract description 7
- 229910001626 barium chloride Inorganic materials 0.000 claims abstract description 7
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 7
- 239000007787 solid Substances 0.000 claims abstract description 7
- 229920002401 polyacrylamide Polymers 0.000 claims description 7
- 241000281325 Dupetor flavicollis Species 0.000 claims description 5
- 241001131764 Ixobrychus sinensis Species 0.000 claims description 5
- 238000007738 vacuum evaporation Methods 0.000 claims description 5
- 229920002125 Sokalan® Polymers 0.000 claims description 4
- 239000004584 polyacrylic acid Substances 0.000 claims description 4
- 108010064470 polyaspartate Proteins 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 3
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 2
- 229920002126 Acrylic acid copolymer Polymers 0.000 claims description 2
- 229920006322 acrylamide copolymer Polymers 0.000 claims description 2
- -1 salt compound Chemical class 0.000 abstract 1
- 235000002639 sodium chloride Nutrition 0.000 description 37
- 239000012535 impurity Substances 0.000 description 14
- 238000000746 purification Methods 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 11
- 239000011575 calcium Substances 0.000 description 8
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 6
- 229910052791 calcium Inorganic materials 0.000 description 6
- 239000011777 magnesium Substances 0.000 description 5
- 238000001914 filtration Methods 0.000 description 4
- 238000004062 sedimentation Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 229910052749 magnesium Inorganic materials 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000013049 sediment Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 2
- ZFXVRMSLJDYJCH-UHFFFAOYSA-N calcium magnesium Chemical compound [Mg].[Ca] ZFXVRMSLJDYJCH-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 229910001425 magnesium ion Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 229910019440 Mg(OH) Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000000274 adsorptive effect Effects 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 230000000536 complexating effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 230000003311 flocculating effect Effects 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 150000002605 large molecules Chemical class 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 159000000003 magnesium salts Chemical class 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 235000019640 taste Nutrition 0.000 description 1
Landscapes
- Seasonings (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses a kind of preparation method of deep-well salt, belong to salt compound seasoner field.The preparation method of deep-well salt is: prepare 310-320g/L sodium chloride brine; After adding the flocculant of 0.1-0.12g/L NaOH and 3-5mg/L, stir, staticly settling 2 hours, filter with membrane filtration bucket, obtain a bittern; After adding the flocculant of 0.5-0.7g/L sodium carbonate and 3-5mg/L, stir, staticly settling 2 hours, filter with membrane filtration bucket, obtain secondary bittern; After adding 0.1-0.14g/L barium chloride, stir, staticly settling 2 hours, filter with film filter, obtain three bittern; Adopt vacuum process, the solid in evaporator and liquid fraction are 4: 11-14, one pressure 0.25-0.35Mpa, temperature 142 DEG C-149 DEG C, the time 2-4 hour of imitating heating clamber; Two effect heating clamber pressure 0.2-0.3Mpa, temperature 130-140 DEG C, time 2-4 hour, obtain particle deep-well salt.Flocculant and membrane filtration technique combine, and improve the quality of bittern purifying, avoid the phenomenon of evaporation equipment fouling.
Description
Technical field
The present invention relates to a kind of preparation method of compound seasoner, be specifically related to a kind of preparation method of deep-well salt.
Background technology
Salt is first of hundred tastes, and be indispensable flavoring in life, except edible, salt is also widely used in industry.Salt can be divided into sea salt, lake salt, well salt, rock salt etc. with different material.Deep-well salt raw material picks up from less than 500 meters deep-wells, and compared with common table salt, deep-well salt is rich in all kinds of natural minerals element, and impurity is few, compares other sources more pure.The raw material of salt manufacturing is bittern, is divided into natural bittern, artificial brine.Bittern, almost containing impurity, can not be directly used in salt manufacturing and produce, generally need remove objectionable impurities wherein, especially calcium magnesium plasma.The sedimentation of the calcium produced after bittern purifying during prior art salt manufacturing, magnesium salts mud often not thoroughly, sediment filters not exclusively, and cause salt slurry to enter salt manufacturing vaporising device, in heating tube, scale effect heat transfer, reduces production efficiency.
Summary of the invention
The object of this invention is to provide a kind of preparation method of deep-well salt, in preparation process, add suitable bittern purifying technique and flocculant, strengthen sediment filter effect, overcome the deficiency of prior art bittern purifying.
For this reason, the present invention adopts following technical proposals.
A. 310-320g/L sodium chloride brine is prepared;
B. bittern purifying:
B1., after adding the flocculant of NaOH and 3-5mg/L by 0.1-0.12g/L amount in bittern, stir, staticly settling 2 hours, filter with membrane filtration bucket, obtain a bittern;
B2., after adding the flocculant of sodium carbonate and 3-5mg/L by 0.5-0.7g/L amount in bittern, stir, staticly settling 2 hours, filter with membrane filtration bucket, obtain secondary bittern;
B3. in bittern, add barium chloride by 0.1-0.14g/L amount, after stirring, staticly settling 2 hours, filter with film filter, obtain three bittern;
C. bittern vacuum evaporation
Adopt vacuum process, the solid in evaporator and liquid fraction are 4: 11-14, and bittern at the running parameter of an effect heating clamber is, operating pressure 0.25-0.35Mpa, operating temperature 142 DEG C-149 DEG C, working time 2-4 hour; Bittern is that operating pressure 0.2-0.3Mpa, operating temperature 130-140 DEG C, working time 2-4 hour, obtain particle deep-well salt at the running parameter of two effect heating clambers.
The present invention at bittern once, double purification time add preferred flocculant respectively, complexing calcium magnesium plasma, accelerates sedimentary precipitation, improves the clean-up effect of bittern; Adopt membrane filtration pattern after bittern purifying, improve filter efficiency and effect; Membrane filtration shortens the bittern purifying time, increases brine treatment amount, improves production efficiency.Flocculant and membrane filtration technique combine, and the content making foreign ion in bittern after purification will be below 1mg/L, improve the quality of bittern purifying, will separately add appropriate polyacrylamide flocculant when bittern evaporation, thus avoid the phenomenon of evaporation equipment fouling.
Detailed description of the invention
The preparation method of deep-well salt of the present invention, comprises two key steps: bittern purifying and evaporation salt manufacturing.
From the bittern of underground mining all containing impurity, the general technique by purifying removes the impurity in bittern.Impurity contained in bittern is generally metal ion, as calcium, magnesium plasma, need add some chemical substances with the removal of impurities of insoluble matter sedimentation and filtration.
Bittern purifying refers to a kind of technique utilizing the method for physics and chemistry to remove the impurity in bittern.Nearly all bittern all contains Ca
2+, Mg
2+, SO
4 2-, Ba
2+, Fe
3+deng impurity, and the existence of these impurity affect product quality impact and to production process.CaSO in bittern
4, MgSO
4, CaCl
2, MgCl
2can make the elevation of boiling point of bittern Deng impurity, viscosity increases, and thus reduces effective heat transfer temperature poor; In addition, impurity is more, and the Mother liquid of vacuum salt production is larger, makes heat increase (namely energy consumption is high) on the one hand; Reduce the rate of recovery of NaCl on the other hand.Therefore, must purified brine in salt producing craft.Flocculant is used in bittern purifying is produced, can the sinking speed of suspended particulate in bittern after accelerated impurity ion reaction, reduce settling time, enhance productivity.
Bittern primary purification:
Saturated bittern is added purification bucket, before starting stirring, add the NaOH of 0.1-0.12g/L.Before stirring terminates, add the flocculant of 3-5mg/L.Close agitator and carry out mud sediment.Precipitate latter 2 hours, the limpid bittern in upper strata is transferred to membrane filtration bucket, and the bittern after filtration enters double purification reaction container, and the mud of precipitation then pours into mud tank.The flocculant used is acrylamide/acrylic acid copolymer flocculant.Containing a large amount of negative electric base in flocculating agent molecule, they are mutually exclusive and make large molecule be extended configuration, and molecule is longer and fully expose active group, and flocculating property is better; Acrylic acid carboxyl is due to electrostatic repulsion effect, the polymer chain of flexing is stretched, facilitates the functional group with adsorptivity to be exposed to surface, because these active sites adsorb in the solution on suspended particles, form interparticle bridge formation, thus accelerate the sedimentation of suspended particles.
The chemical equation related to is:
MgCl
2+2NaOH＝Mg(OH)
2↓+2NaCl
FeCl
3+3NaOH＝Fe(OH)
3↓+3NaCl
Bittern double purification:
The sodium carbonate of 0.5-0.7g/L and the flocculant of 3-5mg/L is added in the bittern of double purification reaction container, 2 hours are staticly settled after stirring, limpid for upper strata bittern is transferred to membrane filtration bucket, and the bittern after filtration enters three purification buckets, and the mud of precipitation then pours into mud tank.Flocculant is poly-aspartate/polyacrylic acid compound flocculant.Poly-aspartate, because of the design feature containing peptide bond and carboxyl isoreactivity group, have the effects such as extremely strong chelating, dispersion, absorption, and compatibility is splendid to calcium, magnesium plasma.Polyacrylic acid contains strong anion active group, by the effect of charge neutrality adsorption bridging, can suspended particulate effectively in adsorptive liquid, and aggegation is agglomerating mutually.Poly-aspartate/polyacrylic acid built-up flocculant can promote sedimentation, clarification, purification.
The chemical equation related to is:
CaSO
4+Na
2CO
3＝2NaOH+CaCO
3↓
CaCl
2+Na
2CO
3＝CaCO
3↓+2NaCl
Bittern three purifications:
In the bittern of three purification buckets, add the barium chloride of 0.1-0.14g/L and the flocculant of 3-5mg/L, after stirring, staticly settle 2 hours, limpid for upper strata bittern is transferred to membrane filtration bucket, filter to obtain three purified brines.
The chemical equation related to is:
Na
2SO
4+BaCl
2＝BaSO
4↓+2NaCl
Through above-mentioned three bittern purifying techniques, the impurity in bittern is removed substantially, thus when bittern evaporation salt manufacturing, can reduce fouling, ensures product quality.
Film is the material with Selective Separation function.Utilize that the Selective Separation of film realizes the separation of the different component of feed liquid, purifying, concentrated process are called UF membrane.From the different of traditional filtering, it is that film can be separated in molecular range, and this process is a kind of physical process, does not need change and interpolation auxiliary agent that phase occurs.The filter membrane that the present invention adopts is film known in those skilled in the art, as the filter membrane product of Kai Mo company of Singapore, W. L. Gore & Associates, Inc. company.
Bittern after purification, Ca wherein
2+, Mg
2+, SO
4 2-detected level is about 0.1mg/L, shows the respond well of bittern purifying.
Still remain a certain amount of calcium, magnesium ion in bittern after bittern purifying, in subsequent evaporation operation, along with the continuous evaporation and concentration of bittern, the calcium in bittern, magnesium ion concentration also constantly increase, and also easily separate out, in addition CaSO in brine transportation, warm
4have the characteristic of retrograde solubility, fouling on the wall being attached to the equipment of pipeline, seriously can reduce heat transfer coefficient, dirty layer is larger, heat transfer coefficient is declined larger, thus equipment capacity is reduced.The elimination of dirt layer can extend the effective time, effcetive output.When bittern evaporation, add appropriate polyacrylamide flocculant, effectively can adsorb the calcium in bittern, magnesium plasma, prevent fouling bad phenomenon.
Evaporation salt manufacturing:
Adopt vacuum process, 2-3mg/L polyacrylamide flocculant is added in bittern, solid in evaporator and liquid fraction are 4: 11-14, and bittern at the running parameter of an effect heating clamber is, operating pressure 0.25-0.35Mpa, operating temperature 142 DEG C-149 DEG C, working time 2-4 hour; Bittern is that operating pressure 0.2-0.3Mpa, operating temperature 130-140 DEG C, working time 2-4 hour, obtain particle deep-well salt at the running parameter of two effect heating clambers.
Evaporation technology is preferably: bittern at the running parameter of an effect heating clamber is, operating pressure 0.3-0.35Mpa, operating temperature 145-147 DEG C, working time 3-4 hour, the bittern of one effect evaporator evaporation proceeds to two effect evaporators, and the running parameter of two effect heating clambers is, pressure 0.2-0.25Mpa, operating temperature 135-140 DEG C, working time 3-4 hour.
Below by specific embodiment, embodiment of the present invention is described further.
Embodiment 1:
A preparation method for deep-well salt, its preparation method comprises the steps:
A. 310g/L sodium chloride brine is prepared;
B. bittern purifying:
B1., after adding the flocculant of NaOH and 3mg/L by 0.1g/L amount in bittern, stir, staticly settling 2 hours, filter with membrane filtration bucket, obtain a bittern;
B2., after adding the flocculant of sodium carbonate and 3mg/L by 0.5g/L amount in bittern, stir, staticly settling 2 hours, filter with membrane filtration bucket, obtain secondary bittern;
B3. in bittern, add barium chloride by 0.1g/L amount, after stirring, staticly settling 2 hours, filter with film filter, obtain three bittern;
C. bittern vacuum evaporation
Adopt vacuum process, add 2mg/L polyacrylamide flocculant in bittern, the solid in evaporator and liquid fraction are 4: 11, and bittern at the running parameter of an effect heating clamber is, operating pressure 0.25Mpa, operating temperature 142 DEG C, 2 hours working times; Bittern is operating pressure 0.2Mpa, operating temperature 130 DEG C, 2 hours working times, obtain particle deep-well salt at the running parameter of two effect heating clambers.
Embodiment 2:
A preparation method for deep-well salt, its preparation method comprises the steps:
A. 310g/L sodium chloride brine is prepared;
B. bittern purifying:
B1., after adding the flocculant of NaOH and 4mg/L by 0.11g/L amount in bittern, stir, staticly settling 2 hours, filter with membrane filtration bucket, obtain a bittern;
B2., after adding the flocculant of sodium carbonate and 4mg/L by 0.6g/L amount in bittern, stir, staticly settling 2 hours, filter with membrane filtration bucket, obtain secondary bittern;
B3. in bittern, add barium chloride by 0.12g/L amount, after stirring, staticly settling 2 hours, filter with film filter, obtain three bittern;
C. bittern vacuum evaporation
Adopt vacuum process, add 2mg/L polyacrylamide flocculant in bittern, the solid in evaporator and liquid fraction are 4: 12, and bittern at the running parameter of an effect heating clamber is, operating pressure 0.3Mpa, operating temperature 145 DEG C, 3 hours working times; Bittern is operating pressure 0.25Mpa, operating temperature 135 DEG C, 3 hours working times, obtain particle deep-well salt at the running parameter of two effect heating clambers.
Embodiment 3:
A preparation method for deep-well salt, its preparation method comprises the steps:
A. 320g/L sodium chloride brine is prepared;
B. bittern purifying:
B1., after adding the flocculant of NaOH and 5mg/L by 0.12g/L amount in bittern, stir, staticly settling 2 hours, filter with membrane filtration bucket, obtain a bittern;
B2., after adding the flocculant of sodium carbonate and 5mg/L by 0.7g/L amount in bittern, stir, staticly settling 2 hours, filter with membrane filtration bucket, obtain secondary bittern;
B3. in bittern, add barium chloride by 0.14g/L amount, after stirring, staticly settling 2 hours, filter with film filter, obtain three bittern;
C. bittern vacuum evaporation
Adopt vacuum process, add 3mg/L polyacrylamide flocculant in bittern, the solid in evaporator and liquid fraction are 4: 14, and bittern at the running parameter of an effect heating clamber is, operating pressure 0.35Mpa, operating temperature 149 DEG C, 4 hours working times; Bittern is operating pressure 0.3Mpa, operating temperature 140 DEG C, 4 hours working times, obtain particle deep-well salt at the running parameter of two effect heating clambers.
Claims (5)
1. a preparation method for deep-well salt, is characterized in that, preparation method comprises the steps:
A. 310-320g/L sodium chloride brine is prepared;
B. bittern purifying:
B1., after adding the flocculant of NaOH and 3-5mg/L by 0.1-0.12g/L amount in bittern, stir, staticly settling 2 hours, filter with membrane filtration bucket, obtain a bittern;
B2., after adding the flocculant of sodium carbonate and 3-5mg/L by 0.5-0.7g/L amount in bittern, stir, staticly settling 2 hours, filter with membrane filtration bucket, obtain secondary bittern;
B3. in bittern, add barium chloride by 0.1-0.14g/L amount, after stirring, staticly settling 2 hours, filter with film filter, obtain three bittern;
C. bittern vacuum evaporation
Adopt vacuum process, the solid in evaporator and liquid fraction are 4: 11-14, and bittern at the running parameter of an effect heating clamber is, operating pressure 0.25-0.35Mpa, operating temperature 142 DEG C-149 DEG C, working time 2-4 hour; Bittern is that operating pressure 0.2-0.3Mpa, operating temperature 130-140 DEG C, working time 2-4 hour, obtain particle deep-well salt at the running parameter of two effect heating clambers.
2. the preparation method of a kind of deep-well salt according to claim 1, is characterized in that: flocculant described in step b1 is acrylamide/acrylic acid copolymer flocculant.
3. the preparation method of a kind of deep-well salt according to claim 1, is characterized in that: flocculant described in step b2 is poly-aspartate/polyacrylic acid compound flocculant.
4. the preparation method of a kind of deep-well salt according to claim 1, it is characterized in that: when vacuum salt, bittern at the running parameter of an effect heating clamber is, operating pressure 0.3-0.35Mpa, operating temperature 145-147 DEG C, working time 3-4 hour, the bittern of one effect evaporator evaporation proceeds to two effect evaporators, and the running parameter of two effect heating clambers is, pressure 0.2-0.25Mpa, operating temperature 135-140 DEG C, working time 3-4 hour.
5. the preparation method of a kind of deep-well salt according to claim 1, is characterized in that: when vacuum salt, adds 2-3mg/L polyacrylamide flocculant in bittern.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110182831A (en) * | 2019-05-28 | 2019-08-30 | 昌鑫生态科技(陕西)有限公司 | The technology of salt lake extraction lithium carbonate |
| CN115708575A (en) * | 2022-09-28 | 2023-02-24 | 山东肥城精制盐厂有限公司 | Refined salt production process based on natural rock salt |
| CN116902994A (en) * | 2023-08-24 | 2023-10-20 | 山东肥城精制盐厂有限公司 | An energy-saving production line for MVR high-purity salt products |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN116902994A (en) * | 2023-08-24 | 2023-10-20 | 山东肥城精制盐厂有限公司 | An energy-saving production line for MVR high-purity salt products |
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