Crystallization device for magnesium chloride production

Abstract

The utility model discloses a crystallization device for magnesium chloride production, and relates to the technical field of magnesium chloride production devices, an outlet of a magnesium chloride solution tank is communicated with a first evaporation tank, an outlet of the first evaporation tank is communicated with a settling tank, and a solid phase outlet of the settling tank is communicated with a first crude product tank; a liquid phase outlet of the settling tank is communicated with a clear liquid tank, an outlet of the clear liquid tank is communicated with a second evaporation tank, and an outlet of the second evaporation tank is communicated with a second crude product tank; outlets of the first crude product tank and the second crude product tank are respectively communicated with a crystallizing tank, and an outlet of the crystallizing tank is communicated with a magnesium chloride finished product tank. The magnesium chloride solution is concentrated twice and then recrystallized, so that the obtained magnesium chloride product is higher in purity and lower in water content, and the quality of the product is improved. In addition, through multiple purification, the yield of the magnesium chloride product is improved, the waste of raw materials is reduced, and the whole process is less in hazardous waste and environment-friendly.

Description

Technical Field

[0001] The utility model relates to the technical field of magnesium chloride production devices, in particular to a crystallization device for magnesium chloride production. Background Art

[0002] Magnesium chloride is an inorganic substance with the chemical formula MgCl 2 , molecular weight 95.211, colorless flaky crystals, slightly soluble in acetone, soluble in water, ethanol, methanol, pyridine. It deliquesces and smokes in moist air, and sublimes when white-hot in a hydrogen gas stream. This substance can form a hexahydrate, i.e. magnesium chloride hexahydrate.

[0003] Whether it is anhydrous magnesium chloride or magnesium chloride hexahydrate, they have a common property that they are easily deliquescent and soluble in water. Crystallization is a very important process in the production of magnesium chloride. The current crystallization process usually involves directly stirring and cooling the magnesium chloride solution to obtain magnesium chloride crystals containing magnesium chloride hexahydrate, which has poor purity and seriously affects product quality. At the same time, the yield of magnesium chloride crystals is low, resulting in a waste of raw materials. Summary of the invention

[0004] The technical problem to be solved by the utility model is: in view of the deficiencies in the prior art, a crystallization device for producing magnesium chloride is provided, and the product has high purity, good quality and high yield.

[0005] In order to solve the above technical problems, the technical solution of the utility model is:

[0006] A crystallization device for magnesium chloride production, comprising a magnesium chloride solution tank, the outlet of the magnesium chloride solution tank is connected to a first evaporation tank through a pipeline, the outlet of the first evaporation tank is connected to a sedimentation tank through a pipeline, and the solid phase outlet of the sedimentation tank is connected to a first crude product tank;

[0007] The liquid phase outlet of the settling tank is connected to a clear liquid tank through a pipeline, the outlet of the clear liquid tank is connected to a second evaporation tank through a pipeline, and the outlet of the second evaporation tank is connected to a second crude product tank;

[0008] The outlets of the first crude product tank and the second crude product tank are respectively connected to a crystallization tank through pipelines, and the outlet of the crystallization tank is connected to a magnesium chloride finished product tank.

[0009] As an improved technical solution, the outlet of the crystallization tank is connected to a centrifuge, the solid phase outlet of the centrifuge is connected to a dryer, and the outlet of the dryer is connected to the magnesium chloride finished product tank.

[0010] As an improved technical solution, a circulation pump is provided at the outlet of the clear liquid tank, the outlet of the circulation pump is connected to a preheater, and the outlet of the preheater is connected to the second evaporation tank through a pipeline.

[0011] As an improved technical solution, the liquid phase outlet of the centrifuge is connected to a mother liquid tank, and the outlet of the mother liquid tank is connected to the second evaporation tank through a pipeline.

[0012] As an improved technical solution, the gas phase outlet of the first evaporation tank is connected to a first condenser, and the outlet of the first condenser is connected to a first condensed water tank.

[0013] As an improved technical solution, the outlet of the preheater is connected to the inlet of the circulation through a pipeline.

[0014] As a preferred technical solution, the gas phase outlet of the second evaporation tank is connected to a second condenser, and the outlet of the second condenser is connected to a second condensed water tank.

[0015] As a preferred technical solution, the outlets of the first condensed water tank and the second condensed water tank are respectively connected to the jacket inlet of the preheater through pipelines.

[0016] Due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0017] The utility model is a crystallization device for magnesium chloride production, comprising a magnesium chloride solution tank, the outlet of the magnesium chloride solution tank is connected to a first evaporation tank through a pipeline, the outlet of the first evaporation tank is connected to a sedimentation tank through a pipeline, the solid phase outlet of the sedimentation tank is connected to a first crude product tank; the liquid phase outlet of the sedimentation tank is connected to a clear liquid tank through a pipeline, the outlet of the clear liquid tank is connected to a second evaporation tank through a pipeline, the outlet of the second evaporation tank is connected to a second crude product tank; the outlets of the first crude product tank and the second crude product tank are respectively connected to a crystallization tank through pipelines, and the outlet of the crystallization tank is connected to a magnesium chloride finished product tank. The magnesium chloride solution enters the first evaporation tank, evaporates part of the water under vacuum to be concentrated and crystallized, then the crystallization liquid enters the sedimentation tank for separation, the upper liquid phase enters the clear liquid tank and is concentrated and purified again under vacuum distillation of the second evaporation tank, then the crude magnesium chloride obtained after two distillations of the first evaporation tank and the second evaporation tank enters the crystallization tank for heat preservation and crystallization, and finally the magnesium chloride product is obtained. By concentrating the magnesium chloride solution twice and then recrystallizing it, the obtained magnesium chloride product has higher purity and lower water content, which improves the quality of the product. In addition, through multiple purifications, the yield of the magnesium chloride product is increased, the waste of raw materials is reduced, and the whole process generates less hazardous waste, which is environmentally friendly.

[0018] The outlet of the crystallization tank of the utility model is connected with a centrifuge, the solid phase outlet of the centrifuge is connected with a dryer, and the outlet of the dryer is connected to the magnesium chloride finished product tank. By centrifuging and drying the crystallized magnesium chloride again, the water content in the magnesium chloride product is further reduced, and the quality of the product is improved.

[0019] The outlet of the clear liquid tank is provided with a circulation pump, the outlet of the circulation pump is connected to a preheater, and the outlet of the preheater is connected to the second evaporation tank through a pipeline. By preheating the material entering the second evaporation tank, the time required for material concentration is reduced, shortening the entire process cycle.

[0020] The liquid phase outlet of the centrifuge is connected to a mother liquid tank, and the outlet of the mother liquid tank is connected to the second evaporation tank through a pipeline. By returning the centrifuged mother liquid to the second evaporation tank, the yield of the magnesium chloride product is further improved and the waste of raw materials is reduced.

[0021] The gas phase outlet of the first evaporation tank is connected to a first condenser, the outlet of the first condenser is connected to a first condensed water tank, the gas phase outlet of the second evaporation tank is connected to a second condenser, and the outlet of the second condenser is connected to a second condensed water tank. The water vapor generated during the distillation of magnesium chloride is condensed and recovered to avoid waste.

[0022] The outlet of the preheater is connected to the inlet of the circulation through a pipeline, and the preheater is circulated externally by a circulation pump, so that the heat exchange effect of the material in the preheater is better.

[0023] The outlets of the first condensed water tank and the second condensed water tank are respectively connected to the jacket inlet of the preheater through pipelines. The water vapor generated during the distillation of magnesium chloride has a high temperature after condensation and recovery, and can be used as a heat source for the preheater to heat the materials in the preheater, thereby fully utilizing energy and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0025] Figure 1 It is a structural schematic diagram of an embodiment of the utility model;

[0026] Among them: 1. magnesium chloride solution tank; 2. first evaporation tank; 3. sedimentation tank; 4. first crude product tank; 5. clear liquid tank; 6. second evaporation tank; 7. second crude product tank; 8. crystallization tank; 9. magnesium chloride finished product tank; 10. centrifuge; 11. dryer; 12. circulation pump; 13. preheater; 14. mother liquid tank; 15. first condenser; 16. first condensed water tank; 17. second condenser; 18. second condensed water tank. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0028] like Figure 1As shown, a crystallization device for magnesium chloride production includes a magnesium chloride solution tank 1, the outlet of the magnesium chloride solution tank 1 is connected to a first evaporation tank 2 through a pipeline, the outlet of the first evaporation tank 2 is connected to a settling tank 3 through a pipeline, and the solid phase outlet of the settling tank 3 is connected to a first crude product tank 4; the liquid phase outlet of the settling tank 3 is connected to a clear liquid tank 5 through a pipeline, the outlet of the clear liquid tank 5 is connected to a second evaporation tank 6 through a pipeline, and the outlet of the second evaporation tank 6 is connected to a second crude product tank 7; the outlets of the first crude product tank 4 and the second crude product tank 7 are respectively connected to a crystallization tank 8 through pipelines, and the outlet of the crystallization tank 8 is connected to a magnesium chloride finished product tank 9. The magnesium chloride solution enters the first evaporation tank 2, evaporates part of the water under vacuum to be concentrated and crystallized, and then the crystallization liquid enters the settling tank 3 for separation, the upper liquid phase enters the clear liquid tank 5 and is concentrated and purified again under vacuum distillation of the second evaporation tank 6, and then the crude magnesium chloride obtained after two distillations of the first evaporation tank 2 and the second evaporation tank 6 enters the crystallization tank 8 for heat preservation and crystallization, and finally the magnesium chloride product is obtained. By concentrating the magnesium chloride solution twice and then recrystallizing it, the obtained magnesium chloride product has higher purity and lower water content, which improves the quality of the product. In addition, through multiple purifications, the yield of the magnesium chloride product is increased, the waste of raw materials is reduced, and the whole process generates less hazardous waste, which is environmentally friendly.

[0029] The outlet of the crystallization tank 8 is connected to a centrifuge 10, and the solid phase outlet of the centrifuge 10 is connected to a dryer 11, and the outlet of the dryer 11 is connected to the magnesium chloride finished product tank 9. By centrifuging and drying the crystallized magnesium chloride again, the water content in the magnesium chloride product is further reduced, and the quality of the product is improved.

[0030] The outlet of the clear liquid tank 5 is provided with a circulation pump 12, the outlet of the circulation pump 12 is connected to a preheater 13, and the outlet of the preheater 13 is connected to the second evaporation tank through a pipeline. By preheating the material entering the second evaporation tank 6, the time required for material concentration is reduced, shortening the entire process cycle.

[0031] The liquid phase outlet of the centrifuge 10 is connected to a mother liquid tank 14, and the outlet of the mother liquid tank 14 is connected to the second evaporation tank 6 through a pipeline. By returning the centrifuged mother liquid to the second evaporation tank 6, the yield of the magnesium chloride product is further improved and the waste of raw materials is reduced.

[0032] The gas phase outlet of the first evaporation tank 2 is connected to a first condenser 15, the outlet of the first condenser 15 is connected to a first condensed water tank 16, the gas phase outlet of the second evaporation tank 6 is connected to a second condenser 17, and the outlet of the second condenser 17 is connected to a second condensed water tank 18. The water vapor generated during the distillation of magnesium chloride is condensed and recovered to avoid waste.

[0033] The outlet of the preheater 13 is connected to the inlet of the circulation through a pipeline, and the preheater 13 is circulated externally by the circulation pump 12, so that the heat exchange effect of the material in the preheater 13 is better.

[0034] The outlets of the first condensed water tank 16 and the second condensed water tank 18 are respectively connected to the jacket inlet of the preheater 13 through pipelines. The water vapor generated during the distillation of magnesium chloride has a high temperature after condensation and recovery, and can be used as a heat source for the preheater 13 to heat the materials in the preheater 13, thereby fully utilizing energy and reducing production costs.

[0035] It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

Claims

1. A crystallization device for magnesium chloride production, comprising a magnesium chloride solution tank, characterized in that: The outlet of the magnesium chloride solution tank is connected to a first evaporation tank through a pipeline, the outlet of the first evaporation tank is connected to a sedimentation tank through a pipeline, and the solid phase outlet of the sedimentation tank is connected to a first crude product tank; The liquid phase outlet of the settling tank is connected to a clear liquid tank through a pipeline, the outlet of the clear liquid tank is connected to a second evaporation tank through a pipeline, and the outlet of the second evaporation tank is connected to a second crude product tank; The outlets of the first crude product tank and the second crude product tank are respectively connected to a crystallization tank through pipelines, and the outlet of the crystallization tank is connected to a magnesium chloride finished product tank.

2. A crystallization device for producing magnesium chloride as claimed in claim 1, characterized in that: The outlet of the crystallization tank is connected to a centrifuge, the solid phase outlet of the centrifuge is connected to a dryer, and the outlet of the dryer is connected to the magnesium chloride finished product tank.

3. A crystallization device for producing magnesium chloride as claimed in claim 1, characterized in that: The outlet of the clear liquid tank is provided with a circulation pump, the outlet of the circulation pump is connected with a preheater, and the outlet of the preheater is connected to the second evaporation tank through a pipeline.

4. A crystallization device for producing magnesium chloride as claimed in claim 2, characterized in that: The liquid phase outlet of the centrifuge is connected to a mother liquid tank, and the outlet of the mother liquid tank is connected to the second evaporation tank through a pipeline.

5. A crystallization device for magnesium chloride production as claimed in claim 3, characterized in that: The gas phase outlet of the first evaporation tank is connected to the first condenser, and the outlet of the first condenser is connected to the first condensed water tank.

6. A crystallization device for magnesium chloride production as claimed in claim 3, characterized in that: The outlet of the preheater is connected to the inlet of the circulation through a pipeline.

7. A crystallization device for magnesium chloride production as claimed in claim 5, characterized in that: The gas phase outlet of the second evaporation tank is connected to a second condenser, and the outlet of the second condenser is connected to a second condensed water tank.

8. A crystallization device for magnesium chloride production as claimed in claim 7, characterized in that: The outlets of the first condensed water tank and the second condensed water tank are respectively connected to the jacket inlet of the preheater through pipelines.

Images