CN113830803A - Brine refining device and method for by-product gypsum and magnesium compound - Google Patents
Brine refining device and method for by-product gypsum and magnesium compound Download PDFInfo
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Abstract
The invention discloses a brine refining device and method for gypsum and magnesium compounds as byproducts, and relates to the technical field of brine refining. The invention recycles the strong brine and the washing water generated in the production for the production system, and no secondary waste is discharged. The prepared gypsum has the whiteness of more than 90 percent and the purity of more than 96 percent; the whiteness of the magnesium compound is more than 92 percent, and the purity is more than 95 percent. On the premise of guaranteeing the quality of primary brine, the process of step-by-step refining is carried out in the brine refining process, crude magnesium hydroxide and calcium sulfate dihydrate are primarily separated, and crude materials are purified by methods of dissolution, precipitation, washing, drying and the like, so that the salt mud which occupies a large amount of land for storage is recycled and comprehensively utilized to produce magnesium series compounds with high added value and semi-hydrated gypsum, waste is changed into valuable, and the problem of salt mud storage in the production of soda ash is greatly relieved.
Description
Technical Field
The invention relates to the technical field of brine refining, in particular to a brine refining device and method for by-product gypsum and magnesium compounds.
Background
In the production process of soda by an ammonia-soda process, the seawater is desalted and then the concentrated brine is used for dissolving the original salt to prepare brine, the concentrated brine, calcium and magnesium impurity ions, silt and the like in the original salt enter the brine after the seawater is desalted, and in order to ensure the quality of soda products, the crude brine is refined in a brine refining process. In the primary refining process of the brine, the lime milk and the mirabilite are simultaneously added into the crude brine, magnesium ions and partial calcium ions in the crude brine are removed, and the generated magnesium hydroxide precipitate, the dihydrate calcium sulfate precipitate and solid impurities in the seawater desalination strong brine, the raw salt and the lime milk are jointly settled in a clarifying barrel to form a multi-component complex mixture, namely salt slurry, such as calcium sulfate, magnesium hydroxide, calcium carbonate, sodium chloride, acid insoluble substances and the like. In order to recover sodium chloride in the salt slurry, the salt slurry in the clarifying barrel is washed and filter-pressed, filtrate light salt water is returned to the salt dissolving process, and the salt slurry filter cake is used for damming, road repairing or stockpiling treatment.
Disclosure of Invention
In order to solve the technical problems, the invention provides a brine refining device and method for gypsum and magnesium compounds as by-products.
In order to realize the technical purpose, the device adopts the following scheme: the brine refining device for the byproduct gypsum and magnesium compound comprises a salt dissolving barrel, a magnesium removal reactor, a magnesium clarifying barrel or an air flotation device, a crude magnesium filter, a calcium removal reactor, a calcium clarifying barrel, a belt filter, a primary brine barrel, a gypsum drying furnace, a refined magnesium filter and a refined magnesium drying furnace; the salt dissolving barrel is connected with the magnesium removal reactor, the magnesium removal reactor is connected with the magnesium clarifying barrel or the air flotation device, the magnesium clarifying barrel or the air flotation device is respectively connected with the crude magnesium filter and the calcium removal reactor, the calcium removal reactor is connected with the calcium clarifying barrel, the calcium clarifying barrel is respectively connected with the primary brine barrel and the belt filter, and the belt filter is respectively connected with the gypsum drying furnace, the calcium clarifying barrel and the salt dissolving barrel; the coarse magnesium filter is respectively connected with a magnesium clarifying barrel or an air flotation device and a coarse magnesium dissolving barrel, the coarse magnesium dissolving barrel is connected with a filter press, the filter press is connected with a fine magnesium reactor, the fine magnesium reactor is connected with a fine magnesium filter, and the fine magnesium filter is respectively connected with a fine magnesium drying furnace, a salt dissolving barrel and a calcium removing reactor.
Compared with the prior art, the device has the beneficial effects that: the device is respectively provided with the calcium removal reactor and the magnesium removal reactor for step-by-step refining, and the filtrate and washing device is connected to the clarifying barrel and the salt dissolving barrel, so that the complete recycling of byproducts is realized, and the comprehensive utilization rate of salt mud resource is improved.
Furthermore, the belt filter is respectively connected with a calcium mother liquid barrel and a calcium washing water barrel, the calcium mother liquid barrel is connected with the calcium clarifying barrel, and the calcium washing water barrel is connected with the salt dissolving barrel.
Furthermore, the refined magnesium filter is respectively connected with a refined magnesium washing water barrel and a refined magnesium mother liquor barrel, the refined magnesium washing water barrel is connected with the salt dissolving barrel, and the refined magnesium mother liquor barrel is connected with the calcium removal reactor.
In order to realize the technical purpose, the method adopts the following scheme:
a brine refining method for by-product gypsum and magnesium compounds comprises the following steps:
a. preparation of crude brine: dissolving raw salt by utilizing seawater desalination strong brine, and sending prepared crude brine to a magnesium removal reactor;
b. magnesium removal reaction: mixing the crude salt water and the lime milk in a magnesium removal reactor, carrying out chemical reaction to form mixed slurry of magnesium hydroxide precipitate and sodium chloride solution, settling the mixed slurry by a magnesium clarifying barrel or realizing preliminary solid-liquid separation by adopting an auxiliary air floatation device, feeding clear liquid into the calcium removal reactor, and conveying the magnesium sludge to a crude magnesium filter by a magnesium sludge pump;
c. production of magnesium compound: filtering magnesium slurry by a crude magnesium filter, then sending the filtered magnesium slurry to a crude magnesium dissolving barrel, mixing the filtered magnesium slurry with sulfuric acid in the crude magnesium dissolving barrel, carrying out chemical reaction to form mixed slurry of calcium sulfate dihydrate precipitates and a magnesium sulfate solution, carrying out solid-liquid separation on the mixed slurry by a filter press, transporting a crude calcium filter cake, sending the magnesium sulfate solution to a refined magnesium reactor, mixing the mixed slurry with sodium carbonate or caustic soda in the refined magnesium reactor, carrying out chemical reaction to form mixed slurry of magnesium hydroxide or magnesium carbonate precipitates and a sodium sulfate solution, sending the mixed slurry into a refined magnesium filter, carrying out solid-liquid separation and washing, reducing impurities and purifying, then sending a filter cake into a refined magnesium drying furnace to produce a magnesium compound, sending the magnesium compound into a refined magnesium packaging machine by refined magnesium grinding and winnowing and conveying equipment, and then carrying out product packaging;
d. treatment of magnesium compound filtrate and washing water: conveying the mother liquor filtered by the crude magnesium filter to a magnesium clarifying barrel; mother liquor filtered by the fine magnesium filter is conveyed to a calcium removal reactor, and washed water filtered by the fine magnesium filter is conveyed to a salt dissolving barrel;
e. calcium removal reaction: b, mixing the magnesium-removed crude brine obtained in the step b with mirabilite and mother liquor conveyed by a refined magnesium filter in a calcium removal reactor, carrying out chemical reaction to form mixed slurry of calcium sulfate dihydrate precipitate and sodium chloride solution, settling the mixed slurry by a calcium clarifying barrel, overflowing supernatant into a primary brine barrel for continuously carrying out a secondary refining process, and conveying bottom calcium slurry to a belt filter;
f. gypsum production: after the calcium slurry enters a belt filter, carrying out solid-liquid separation and washing to obtain dihydrate gypsum, conveying the dihydrate gypsum to a gypsum drying furnace to produce semi-hydrated gypsum, grinding and winnowing the semi-hydrated gypsum, conveying the semi-hydrated gypsum to a gypsum packaging machine through conveying equipment, and then packaging the product;
g. and (3) treating gypsum filtrate and washing water: conveying the mother liquor filtered by the belt filter to a calcium clarifying barrel; conveying the washed water filtered by the belt filter to a salt dissolving barrel.
Compared with the prior art, the method has the beneficial effects that: the strong brine and the washing water generated in the process are recycled for the production system, and no secondary waste is discharged. The prepared gypsum has the whiteness of more than 90 percent and the purity of more than 96 percent; the whiteness of the magnesium compound is more than 92 percent, and the purity is more than 95 percent. On the premise of guaranteeing the quality of primary brine, the process of step-by-step refining is carried out in the brine refining process, crude magnesium hydroxide and calcium sulfate dihydrate are primarily separated, and crude materials are purified by methods of dissolution, precipitation, washing, drying and the like, so that the salt mud which occupies a large amount of land for storage is recycled and comprehensively utilized to produce magnesium series compounds with high added value and semi-hydrated gypsum, waste is changed into valuable, and the problem of salt mud storage in the production of soda ash is greatly relieved.
Furthermore, in the step a, the NaCl content in the raw salt is more than or equal to 93%, and the sodium chloride content in the prepared crude brine is more than or equal to 310 g/L.
Further, in the step b, the content of effective calcium oxide in the lime milk is 224-252 g/L, and the stirring speed of the magnesium removal reactor is 5-11 rpm; the magnesium mud sedimentation rate at the bottom of the magnesium clarifying barrel is more than or equal to 95 percent, and the height of the supernatant layer is more than or equal to 4 m.
Furthermore, the air pressure of the air flotation device in the step b is 0.3-0.5 MPa, and the sedimentation rate of the floating mud is more than or equal to 90%.
Further, in the step c, the water mass content of the crude magnesium filter cake is less than or equal to 30 percent, the sulfuric acid concentration is 60 percent, the water mass content of the crude calcium filter cake after filter pressing is less than or equal to 50 percent, and Na in sodium carbonate2CO3Or the NaOH content in the caustic soda is more than or equal to 98 percent, and the stirring speed of the refined magnesium reactor is 5-11 rpm; the mass content of water in the refined magnesium filter cake is less than or equal to 30 percent, the content of sodium chloride is less than or equal to 0.07 percent, and the discharging temperature of the refined magnesium drying furnace is 120-140 ℃.
Furthermore, in the step e, the concentration of mirabilite is 142-213 g/L, and the stirring speed of the calcium removal reactor is 5-11 rpm; the sedimentation rate of the magnesium slurry at the bottom of the calcium clarifying barrel is more than or equal to 90 percent, and the height of the supernatant layer is more than or equal to 4 m.
And furthermore, in the step f, the mass content of the water in the dihydrate gypsum filter cake is less than or equal to 25%, the content of sodium chloride is less than or equal to 0.07%, and the discharging temperature of the gypsum drying furnace is 125-150 ℃.
Drawings
FIG. 1 is a schematic diagram showing the apparatus connection of a brine refining apparatus for gypsum and magnesium compounds as by-products according to an embodiment of the present invention;
FIG. 2 is a flow chart of a brine refining process for by-product gypsum and magnesium compounds provided in the embodiment of the present invention;
labeled as: 1. a salt dissolving barrel; 2. a crude brine buffer tank; 3. a crude brine pump; 4. a magnesium removal reactor; 5. a magnesium clarifying barrel; 6. a calcium removal reactor; 7. a calcium clarifying tank; 8. a primary brine barrel; 9. a primary brine pump; 10. a magnesium slurry pump; 11. a coarse magnesium filter; 12. a crude magnesium mother liquor barrel; 13. a crude magnesium mother liquor pump; 14. a coarse magnesium conveyor belt; 15. a sulfuric acid bucket; 16. adding an acid pump; 17. a crude magnesium dissolving barrel; 18. a feeding pump; 19. a filter press; 20. a coarse calcium conveying belt; 21. a magnesium sulfate buffer barrel; 22. a magnesium sulfate pump; 23. a storage bin; 24. a refined magnesium reactor; 25. a refined magnesium filter; 26. a refined magnesium washing bucket; 27. a refined magnesium washing water pump; 28. a refined magnesium mother liquor barrel; 29. a refined magnesium mother liquor pump; 30. a refined magnesium conveying belt; 31. a refined magnesium drying furnace; 32. fine magnesium grinding, winnowing and conveying equipment; 33. a refined magnesium packaging machine; 34. a calcium slurry pump; 35. a belt filter; 36. a calcium mother liquor barrel; 37. a calcium mother liquor pump; 38. a calcium washing bucket; 39. a calcium wash pump; 40. a dihydrate gypsum conveyor belt; 41. a gypsum drying furnace; 42. gypsum grinding, winnowing and conveying equipment; 43. a gypsum packaging machine.
Detailed Description
The present invention will be described in detail with reference to the following embodiments in order to fully understand the objects, features and effects of the invention, but the present invention is not limited thereto.
As shown in figure 1, the invention provides a brine refining device for by-product gypsum and magnesium compounds, which comprises a salt dissolving barrel 1, a crude brine buffer barrel 2, a crude brine pump 3, a magnesium removal reactor 4, a magnesium clarifying barrel 5, a calcium removal reactor 6, a calcium clarifying barrel 7, a primary brine barrel 8, a primary brine pump 9, a magnesium slurry pump 10, a crude magnesium filter 11, a crude magnesium mother liquor barrel 12, a crude magnesium mother liquor pump 13, a crude magnesium conveying belt 14, a sulfuric acid barrel 15, an acid adding pump 16, a crude magnesium dissolving barrel 17, a feeding pump 18, a pressure filter 19, a crude calcium conveying belt 20, a magnesium sulfate buffer barrel 21, a magnesium sulfate pump 22, a storage bin 23, a refined magnesium reactor 24, a refined magnesium filter 25, a refined magnesium washing water barrel 26, a refined magnesium washing water pump 27, a refined magnesium mother liquor barrel 28, a refined magnesium mother liquor pump 29, a refined magnesium conveying belt 30, a refined magnesium drying furnace 31, a refined magnesium grinding and conveying device 32, a refined magnesium packing machine 33, a calcium 34, a refined magnesium packing machine 34, The device comprises a belt filter 35, a calcium mother liquor barrel 36, a calcium mother liquor pump 37, a calcium washing water barrel 38, a calcium washing water pump 39, a dihydrate gypsum conveying belt 40, a gypsum drying furnace 41, gypsum grinding, winnowing and conveying equipment 42 and a gypsum packing machine 43.
The salt dissolving barrel 1 is connected with the crude salt water buffer barrel 2 through a pipeline, the crude salt water buffer barrel 2 is connected with the magnesium removal reactor 4 through a crude salt water pump 3 and a matched pipeline, and the magnesium removal reactor 4 is connected with the magnesium clarifying barrel 5 (or an air flotation device) through a pipeline. Magnesium clarification tank 5 (or air supporting device) is connected with calcium removal reactor 6 through the pipeline, and calcium removal reactor 6 passes through the chute and is connected with calcium clarification tank 7, and calcium clarification tank 7 passes through the pipeline and is connected with primary brine bucket 8, and primary brine bucket 8 passes through the pipeline and is connected with primary brine pump 9.
The calcium clarifying barrel 7 is also connected with a belt filter 35 through a calcium slurry pump 34 and a matched pipeline, the belt filter 35 is connected with a gypsum drying furnace 41 through a dihydrate gypsum conveying belt 40, and the gypsum drying furnace 41 is connected with a gypsum packing machine 43 through gypsum grinding, winnowing and conveying equipment 42.
The belt filter 35 is also connected with a calcium mother liquor barrel 36 and a calcium washing water barrel 38 through pipelines respectively, and the calcium mother liquor barrel 36 is connected with the calcium clarifying barrel 7 through a calcium mother liquor pump 37. The calcium washing water barrel 38 is connected with the salt dissolving barrel 1 through a calcium washing water pump 39.
The magnesium clarifying barrel 5 (or an air flotation device) is connected with a crude magnesium filter 11 through a magnesium slurry pump 10, the crude magnesium filter 11 is connected with a crude magnesium mother liquor barrel 12 through a pipeline, and the crude magnesium mother liquor barrel 12 is connected with the magnesium clarifying barrel 5 (or the air flotation device) through a crude magnesium mother liquor pump 13. The crude magnesium filter 11 is also connected with a crude magnesium conveying belt 14, the crude magnesium conveying belt 14 is connected with a crude magnesium dissolving barrel 17, and a sulfuric acid barrel 15 is connected with the crude magnesium dissolving barrel 17 through an acid adding pump 16. The crude magnesium dissolving barrel 17 is also connected with a filter press 19 through a feeding pump 18, and the filter press 19 is respectively connected with a crude calcium conveying belt 20 and a magnesium sulfate buffer barrel 21. The magnesium sulfate buffer barrel 21 is connected with a refined magnesium reactor 24 through a magnesium sulfate pump 22 and a matched pipeline. The stock bin 23 is connected with a refined magnesium reactor 24 through a blanking device and a matched pipeline, and the refined magnesium reactor 24 is connected with a refined magnesium filter 25. The refined magnesium filter 25 is connected with a refined magnesium drying furnace 31 through a refined magnesium conveying belt 30, and the refined magnesium drying furnace 31 is connected with a refined magnesium packing machine 33 through a refined magnesium grinding, winnowing and conveying device 32.
The refined magnesium filter 25 is also connected with a refined magnesium washing water barrel 26 and a refined magnesium mother liquor barrel 28 through pipelines respectively, and the refined magnesium washing water barrel 26 is connected with the salt dissolving barrel 1 through a refined magnesium washing water pump 27 and a matched pipeline; the refined magnesium mother liquor barrel 28 is connected with the calcium removal reactor 6 through a refined magnesium mother liquor pump 29 and a matched pipeline.
A brine refining method for by-product gypsum and magnesium compounds is disclosed, the process flow is shown in figure 2, and the method comprises the following steps:
a. the method comprises the steps of dissolving raw salt in a salt dissolving barrel 1 by utilizing seawater desalination strong brine to prepare crude salt water with the sodium chloride content of 313 g/L, and conveying the crude salt water to a magnesium removal reactor 4 through a crude salt water pump 3 after the crude salt water overflows to a crude salt water buffer barrel 2.
b. Magnesium removal reaction: the crude salt water and the ash milk with the effective calcium oxide content of 231g/L enter the magnesium removal reactor 4 according to the flow ratio of 60:1, are mixed in the magnesium removal reactor 4 through continuous stirring, and carry out chemical reaction to form mixed slurry of magnesium hydroxide precipitate and sodium chloride solution. The mixed slurry is subjected to primary solid-liquid separation by a magnesium clarifying barrel 5 or an air floatation device, and the mud sedimentation rate at the bottom of the magnesium clarifying barrel 5 is controlled to be more than or equal to 95 percent, the height of a clear liquid layer is controlled to be more than or equal to 4m, or the mud sedimentation rate of the air floatation device is controlled to be more than or equal to 90 percent. Clear liquid in the magnesium clarifying barrel 5 is magnesium-removed crude brine, the magnesium-removed crude brine flows to the calcium removal reactor 6, and magnesium slurry is conveyed to the crude magnesium filter 11 through a magnesium slurry pump 10.
c. Production of magnesium compound: the magnesium slurry is filtered by a crude magnesium filter 11, the water content of a crude magnesium filter cake is controlled to be less than or equal to 30%, the crude magnesium filter cake is conveyed to a crude magnesium dissolving bucket 17 through a crude magnesium conveying belt 14 and sulfuric acid with the mass fraction of 60% added by an acid adding pump 16 according to the mass ratio of 1:3.5, and the crude magnesium dissolving bucket 17 is continuously stirred to realize mixing and carry out chemical reaction to form mixed slurry of calcium sulfate dihydrate precipitate and magnesium sulfate solution. The mixed slurry enters a filter press 19 through a filter press feeding pump 18, solid-liquid separation is carried out in the filter press 19, the pressure maintaining pressure of the filter press 19 is controlled to be 0.5-0.6 MPa, and the water content of a filter cake is controlled to be less than or equal to 50%. The crude calcium filter cake is transported outside by a crude calcium conveying belt 20, the magnesium sulfate solution overflows to a magnesium sulfate buffer barrel 21, the magnesium sulfate solution and soda ash under a storage bin 23 are conveyed to a refined magnesium reactor 24 by a magnesium sulfate pump 22 in a molar ratio of 1:0.525 (or 1: 1.05), and mixing and chemical reaction are realized in the refined magnesium reactor 24 through continuous stirring to form mixed slurry of magnesium hydroxide or magnesium carbonate precipitate and the sodium sulfate solution. The mixed slurry enters a refined magnesium filter 25 for solid-liquid separation and washing, and the water content of a refined magnesium filter cake is controlled to be less than or equal to 30 percent and the sodium chloride content is controlled to be less than or equal to 0.07 percent. And (3) feeding the washed filter cake into a refined magnesium drying furnace 31 through a refined magnesium conveying belt 30, producing a magnesium compound in the refined magnesium drying furnace 31 by utilizing steam through indirect heating, controlling the discharging temperature of the refined magnesium drying furnace 31 to be 120-140 ℃, feeding the magnesium compound into a refined magnesium packaging machine 33 through refined magnesium grinding, winnowing and conveying equipment 32, and packaging the product.
d. Treatment of magnesium compound filtrate and washing water: the mother liquor filtered by the crude magnesium filter 11 enters a crude magnesium mother liquor barrel 12 and is conveyed to a magnesium clarifying barrel 5 by a crude magnesium mother liquor pump 13; mother liquor filtered by the refined magnesium filter 25 enters a refined magnesium mother liquor barrel 28 and is conveyed to the calcium removal reactor 6 through a refined magnesium mother liquor pump 29, and washed water filtered by the refined magnesium filter 25 enters a refined magnesium washing water barrel 26 and is conveyed to the salt dissolving barrel 1 through a refined magnesium washing water pump 27.
e. Calcium removal reaction: and c, feeding the magnesium-removed crude salt water obtained in the step b, 178g/L of mirabilite and mother liquor conveyed by a refined magnesium mother liquor pump 29 into a calcium removal reactor 6 according to the flow ratio of 14:1, and mixing and carrying out chemical reaction in the calcium removal reactor 6 through continuous stirring to form mixed slurry of calcium sulfate dihydrate sediment and a sodium chloride solution. The mixed slurry is settled by a calcium clarifying barrel 7, the settling rate of the slurry at the bottom is controlled to be more than or equal to 90 percent, the thickness of a clear liquid layer is controlled to be more than or equal to 4m, the clear liquid at the upper layer overflows to a primary brine barrel 8 and is conveyed to a secondary refining process by a primary brine pump 9, and the calcium slurry at the bottom is conveyed to a belt filter 35 by a calcium slurry pump 34.
f. Gypsum production: the calcium slurry enters a belt filter 35 to carry out solid-liquid separation and washing to obtain dihydrate gypsum, and the water content of a dihydrate gypsum filter cake is controlled to be less than or equal to 25 percent and the sodium chloride content is controlled to be less than or equal to 0.07 percent. Conveying the washed dihydrate gypsum 40 to a gypsum drying furnace 41 through a dihydrate gypsum conveying belt, indirectly heating the dihydrate gypsum in the gypsum drying furnace 41 by using steam to produce semi-hydrated gypsum, controlling the discharging temperature of the gypsum drying furnace 41 to be 125-150 ℃, and conveying the semi-hydrated gypsum into a gypsum packaging machine 43 through gypsum grinding, winnowing and conveying equipment 42 to package the semi-hydrated gypsum.
g. And (3) treating gypsum filtrate and washing water: mother liquor filtered by the belt filter 35 enters a calcium mother liquor barrel 36 and is conveyed to a calcium clarifying barrel 7 through a calcium mother liquor pump 37; the washed water filtered by the belt filter 35 enters a calcium washing water barrel 38 and is conveyed to the salt dissolving barrel 1 through a calcium washing water pump 39.
Gypsum and magnesium compounds are respectively obtained by removing calcium and magnesium step by step and are packaged, magnesium compound filtrate and gypsum filtrate generated in the reaction process are respectively returned to a magnesium clarifying barrel 5 and a calcium clarifying barrel 7, magnesium compound washing water and gypsum washing water are returned to a salt dissolving barrel 1, and by-products in the production process are completely recycled, so that comprehensive utilization of resources is effectively realized.
Finally, it is noted that: the above-mentioned list is only the preferred embodiment of the present invention, and naturally those skilled in the art can make modifications and variations to the present invention, which should be considered as the protection scope of the present invention provided they are within the scope of the claims of the present invention and their equivalents.
Claims (10)
1. A brine refining device for byproduct gypsum and magnesium compounds comprises a salt dissolving barrel, a magnesium removal reactor, a magnesium clarifying barrel or an air flotation device, a crude magnesium filter, a calcium removal reactor, a calcium clarifying barrel, a belt filter, a primary brine barrel, a gypsum drying furnace, a refined magnesium filter and a refined magnesium drying furnace; it is characterized in that the preparation method is characterized in that,
the salt dissolving barrel is connected with the magnesium removal reactor, the magnesium removal reactor is connected with the magnesium clarifying barrel or the air flotation device, the magnesium clarifying barrel or the air flotation device is respectively connected with the crude magnesium filter and the calcium removal reactor, the calcium removal reactor is connected with the calcium clarifying barrel, the calcium clarifying barrel is respectively connected with the primary brine barrel and the belt filter, and the belt filter is respectively connected with the gypsum drying furnace, the calcium clarifying barrel and the salt dissolving barrel;
the coarse magnesium filter is respectively connected with a magnesium clarifying barrel or an air flotation device and a coarse magnesium dissolving barrel, the coarse magnesium dissolving barrel is connected with a filter press, the filter press is connected with a fine magnesium reactor, the fine magnesium reactor is connected with a fine magnesium filter, and the fine magnesium filter is respectively connected with a fine magnesium drying furnace, a salt dissolving barrel and a calcium removing reactor.
2. The apparatus of claim 1, wherein the belt filter is connected to a calcium mother liquor tank and a calcium washing tank, respectively, the calcium mother liquor tank is connected to a calcium clarifying tank, and the calcium washing tank is connected to a salt dissolving tank.
3. The brine refining device for byproduct gypsum and magnesium compound as claimed in claim 1, wherein the refined magnesium filter is connected to a refined magnesium washing tank and a refined magnesium mother liquor tank, respectively, the refined magnesium washing tank is connected to the salt dissolving tank, and the refined magnesium mother liquor tank is connected to the calcium removal reactor.
4. A method for purifying brine by producing gypsum and magnesium compounds as by-products, using the brine purification apparatus according to any one of claims 1 to 3, characterized by comprising the steps of:
a. preparation of crude brine: dissolving raw salt by utilizing seawater desalination strong brine, and sending prepared crude brine to a magnesium removal reactor;
b. magnesium removal reaction: mixing the crude salt water and the lime milk in a magnesium removal reactor, carrying out chemical reaction to form mixed slurry of magnesium hydroxide precipitate and sodium chloride solution, settling the mixed slurry by a magnesium clarifying barrel or realizing preliminary solid-liquid separation by adopting an auxiliary air floatation device, feeding clear liquid into the calcium removal reactor, and conveying the magnesium sludge to a crude magnesium filter by a magnesium sludge pump;
c. production of magnesium compound: filtering magnesium slurry by a crude magnesium filter, then sending the filtered magnesium slurry to a crude magnesium dissolving barrel, mixing the filtered magnesium slurry with sulfuric acid in the crude magnesium dissolving barrel, carrying out chemical reaction to form mixed slurry of calcium sulfate dihydrate precipitates and a magnesium sulfate solution, carrying out solid-liquid separation on the mixed slurry by a filter press, transporting a crude calcium filter cake, sending the magnesium sulfate solution to a refined magnesium reactor, mixing the mixed slurry with sodium carbonate or caustic soda in the refined magnesium reactor, carrying out chemical reaction to form mixed slurry of magnesium hydroxide or magnesium carbonate precipitates and a sodium sulfate solution, sending the mixed slurry into a refined magnesium filter, carrying out solid-liquid separation and washing, reducing impurities and purifying, then sending a filter cake into a refined magnesium drying furnace to produce a magnesium compound, sending the magnesium compound into a refined magnesium packaging machine by refined magnesium grinding and winnowing and conveying equipment, and then carrying out product packaging;
d. treatment of magnesium compound filtrate and washing water: conveying the mother liquor filtered by the crude magnesium filter to a magnesium clarifying barrel; mother liquor filtered by the fine magnesium filter is conveyed to a calcium removal reactor, and washed water filtered by the fine magnesium filter is conveyed to a salt dissolving barrel;
e. calcium removal reaction: b, mixing the magnesium-removed crude brine obtained in the step b with mirabilite and mother liquor conveyed by a refined magnesium filter in a calcium removal reactor, carrying out chemical reaction to form mixed slurry of calcium sulfate dihydrate precipitate and sodium chloride solution, settling the mixed slurry by a calcium clarifying barrel, overflowing supernatant into a primary brine barrel for continuously carrying out a secondary refining process, and conveying bottom calcium slurry to a belt filter;
f. gypsum production: after the calcium slurry enters a belt filter, carrying out solid-liquid separation and washing to obtain dihydrate gypsum, conveying the dihydrate gypsum to a gypsum drying furnace to produce semi-hydrated gypsum, grinding and winnowing the semi-hydrated gypsum, conveying the semi-hydrated gypsum to a gypsum packaging machine through conveying equipment, and then packaging the product;
g. and (3) treating gypsum filtrate and washing water: conveying the mother liquor filtered by the belt filter to a calcium clarifying barrel; conveying the washed water filtered by the belt filter to a salt dissolving barrel.
5. The method for refining by-product gypsum and magnesium compound brine as claimed in claim 4, wherein the NaCl content in the raw salt in step a is not less than 93%, and the sodium chloride content in the prepared crude brine is not less than 310 g/L.
6. The brine refining method of by-product gypsum and magnesium compound as claimed in claim 4, wherein in step b, the content of effective calcium oxide in lime milk is 224-252 g/L, and the stirring speed of the magnesium removal reactor is 5-11 rpm; the magnesium mud sedimentation rate at the bottom of the magnesium clarifying barrel is more than or equal to 95 percent, and the height of the supernatant layer is more than or equal to 4 m.
7. The method for refining by-product gypsum and magnesium compound brine as claimed in claim 4, wherein the pressure of the compressed air in the air floating device in step b is 0.3-0.5 MPa, and the mud sedimentation rate is not less than 90%.
8. The brine refining method for by-product gypsum and magnesium compound as claimed in claim 4, wherein in step c, the water content of the crude magnesium filter cake is less than or equal to 30% by mass, the concentration of sulfuric acid is 60%, the water content of the crude calcium filter cake after filter pressing is less than or equal to 50%, and Na in sodium carbonate is2CO3Or the NaOH content in the caustic soda is more than or equal to 98 percent, and the stirring speed of the refined magnesium reactor is 5-11 rpm; the mass content of water in the refined magnesium filter cake is less than or equal to 30 percent, the mass content of sodium chloride is less than or equal to 0.07 percent, and the discharging temperature of the refined magnesium drying furnace is 120-140 ℃.
9. The brine refining method for the byproduct gypsum and the magnesium compound according to claim 4, wherein in the step e, the concentration of mirabilite is 142-213 g/L, and the stirring speed of the calcium removal reactor is 5-11 rpm; the sedimentation rate of the magnesium slurry at the bottom of the calcium clarifying barrel is more than or equal to 90 percent, and the height of the supernatant layer is more than or equal to 4 m.
10. The brine refining method of byproduct gypsum and magnesium compound according to claim 4, wherein the mass content of water in the dihydrate gypsum filter cake in step f is less than or equal to 25%, the mass content of sodium chloride is less than or equal to 0.07%, and the discharge temperature of the gypsum drying furnace is 125-150 ℃.
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