CN112777633B - A kind of method for melting crystallization and purifying vanadyl sulfate - Google Patents
A kind of method for melting crystallization and purifying vanadyl sulfate Download PDFInfo
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- 229910000352 vanadyl sulfate Inorganic materials 0.000 title claims abstract description 118
- UUUGYDOQQLOJQA-UHFFFAOYSA-L vanadyl sulfate Chemical compound [V+2]=O.[O-]S([O-])(=O)=O UUUGYDOQQLOJQA-UHFFFAOYSA-L 0.000 title claims abstract description 117
- 229940041260 vanadyl sulfate Drugs 0.000 title claims abstract description 117
- 238000002425 crystallisation Methods 0.000 title claims abstract description 83
- 230000008025 crystallization Effects 0.000 title claims abstract description 77
- 238000002844 melting Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000008018 melting Effects 0.000 title claims abstract description 28
- 239000000047 product Substances 0.000 claims abstract description 57
- 230000035900 sweating Effects 0.000 claims abstract description 51
- 238000000746 purification Methods 0.000 claims abstract description 37
- 238000001914 filtration Methods 0.000 claims abstract description 36
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 239000013078 crystal Substances 0.000 claims abstract description 10
- 239000006227 byproduct Substances 0.000 claims abstract description 7
- 210000004243 sweat Anatomy 0.000 claims abstract description 6
- 238000001816 cooling Methods 0.000 claims description 34
- 238000010438 heat treatment Methods 0.000 claims description 16
- 239000012535 impurity Substances 0.000 abstract description 15
- 230000004907 flux Effects 0.000 abstract description 13
- 239000000126 substance Substances 0.000 abstract description 6
- 239000000463 material Substances 0.000 abstract description 3
- 239000000155 melt Substances 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 description 61
- GNTDGMZSJNCJKK-UHFFFAOYSA-N divanadium pentaoxide Chemical compound O=[V](=O)O[V](=O)=O GNTDGMZSJNCJKK-UHFFFAOYSA-N 0.000 description 8
- 238000007670 refining Methods 0.000 description 8
- 229910052720 vanadium Inorganic materials 0.000 description 8
- 238000002360 preparation method Methods 0.000 description 7
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 6
- 238000000605 extraction Methods 0.000 description 6
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 238000011084 recovery Methods 0.000 description 4
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 3
- 239000011651 chromium Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000012074 organic phase Substances 0.000 description 3
- 238000004321 preservation Methods 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- -1 new energy Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- XHCLAFWTIXFWPH-UHFFFAOYSA-N [O-2].[O-2].[O-2].[O-2].[O-2].[V+5].[V+5] Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[V+5].[V+5] XHCLAFWTIXFWPH-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 229910000272 alkali metal oxide Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 229910001430 chromium ion Inorganic materials 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000005191 phase separation Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
- 229910001935 vanadium oxide Inorganic materials 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G31/00—Compounds of vanadium
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
Abstract
一种熔融结晶提纯硫酸氧钒的方法，属于化工、材料技术领域。将低纯度硫酸氧钒原料先加热至熔融状态，进行一级结晶和一级过滤得到粗硫酸氧钒结晶产物和结晶残液，之后将粗硫酸氧钒结晶产物进行发汗提纯和离心过滤得到高纯硫酸氧钒产物和发汗残液，最后将上述结晶残液和发汗残液收集并冷却，得到粗硫酸氧钒副产品。整个过程不使用其他熔剂，避免了二次污染。本发明熔融结晶方法包含结晶提纯和发汗提纯两个阶段，可分阶段地去除硫酸氧钒中的高熔点和低熔点杂质，发汗提纯后结合离心过滤，可有效分离高纯硫酸氧钒结晶产品，避免了夹杂、包藏、粘附在结晶产品内部、表面的杂质残液，降低了成本，缩短了流程；达到了高效、清洁、节能提纯的目的。
A method for purifying vanadyl sulfate by melting crystallization belongs to the technical fields of chemical industry and materials. The low-purity vanadyl sulfate raw material is first heated to a molten state, and primary crystallization and primary filtration are performed to obtain a crude vanadyl sulfate crystalline product and a crystallization residue, and then the crude vanadyl sulfate crystalline product is subjected to sweat purification and centrifugal filtration to obtain high-purity vanadyl sulfate. The vanadyl sulfate product and the perspiration residue are finally collected and cooled to obtain the crude vanadyl sulfate by-product. No other flux is used in the whole process, which avoids secondary pollution. The melt crystallization method of the invention includes two stages of crystallization purification and sweating purification, and can remove high-melting point and low-melting point impurities in vanadyl sulfate in stages. After sweating and purification, combined with centrifugal filtration, high-purity vanadyl sulfate crystal products can be effectively separated. It avoids the impurity residue that is mixed, occluded, and adhered to the inside and surface of the crystalline product, reduces the cost, shortens the process, and achieves the purpose of efficient, clean, energy-saving purification.
Description
Technical Field
The invention relates to the technical field of chemical engineering and materials, in particular to a method for purifying vanadyl sulfate by melt crystallization.
Background
Vanadyl sulfate (VOSO)4) The vanadium oxide is an important industrial vanadium product, is an important raw material for preparing vanadium battery electrolyte and advanced glass manufacture, and is widely applied to the fields of chemical industry, materials, new energy, medicines and the like. At present, vanadyl sulfate is mostly prepared from industrial vanadic anhydride, and has low quality and high impurity content, so that the vanadyl sulfate can not meet the high standard requirements in the fields of batteries and the like. Therefore, how to prepare high-purity vanadyl sulfate with low cost and high efficiency becomes one of the key points of sustainable development in multiple fields such as new energy and the like.
At present, the preparation method of high-purity vanadyl sulfate is mainly a solution purification method. The Chinese patent application number is searched as follows: CN201510698603.8, application date: 20151023, inventive name: the application discloses a preparation method of a high-purity vanadyl sulfate solution, which comprises the following steps: a) fe2+Oxidation of (2); b) fe3+Removing; c) removing chromium ions and preparing vanadyl hydroxide; d) preparing a high-purity vanadyl sulfate solution; the crude vanadyl sulfate solution is vanadyl sulfate solution with chromium content being more than or equal to 550.3mg/L and iron content being more than or equal to 269.6 mg/L. The vanadyl sulfate solution obtained by the method has the chromium content of less than or equal to 0.002 percent and the iron content of less than or equal to 0.0027 g/L.
The Chinese patent application number is searched as follows: CN201210108878.8, application date: 20120412, title of invention: a method for preparing vanadyl sulfate electrolyte of an all-vanadium redox flow battery. The method is characterized in that vanadyl sulfate solution obtained by leaching, back-extracting and resin analysis of vanadium slag and stone coal is adjusted in pH by using alkali metal or alkaline earth metal oxide or hydroxide, and an inorganic reducing agent is added; performing multi-stage countercurrent extraction by using P204 or P507, TBP and sulfonated kerosene extraction agent, and washing a vanadium-loaded organic phase after two-phase separation; carrying out multistage countercurrent back extraction on the vanadium-loaded organic phase by using a sulfuric acid solution at 2-5 stages to prepare vanadyl sulfate back extraction liquid; adjusting the pH value of the vanadyl sulfate back-extraction liquid, adding an organic reducing agent to adjust the potential value of the solution, extracting by using the extracting agent, separating two phases, washing the vanadium-loaded organic phase by using a sulfuric acid solution, and carrying out multi-stage counter-current back extraction by using the sulfuric acid solution to obtain a vanadyl sulfate solution; distilling to the concentration required by the all-vanadium redox flow battery. The method can prepare vanadyl sulfate with certain purity, but has a long preparation process, and simultaneously needs to add additives, reducing agents and the like with certain content, so that the improvement of the product purity is limited.
In addition, the melting crystallization method can also purify the substance, and the principle is that the property of the substance to be purified, which is different from the melting point of the impurity, is utilized, and the crystallization of the substance and the separation of the impurity are promoted under the driving force of the supersaturation degree or the supercooling degree in the crystallization process, so that the effect of improving the purity is achieved. The method does not need to add any dissolving (melting) agent and is environment-friendlyHigh efficiency, low energy consumption, short process flow and high product purity, and can be widely applied to the field of chemical industry. The vanadyl sulfate has a melting point as low as 105 ℃, contains impurity elements such as Fe, Al, Mn, Cr, Si and the like, and has a melting point with VOSO4The melting points are different greatly, the high-efficiency purification can be realized by adopting a melt crystallization method, and the high-efficiency separation can be realized by adopting centrifugal filtration on the sweating liquid, so that the impurity removal is enhanced.
Disclosure of Invention
1. Technical problem to be solved by the invention
The invention aims to solve the problems of long and complicated technological process, high cost and the like of vanadyl sulfate purification in the prior art, and provides a method for purifying vanadyl sulfate by melting crystallization. Meanwhile, collecting and cooling the crystallization residual liquid and the sweating liquid to obtain a crude vanadyl sulfate byproduct.
2. Technical scheme
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
heating a vanadyl sulfate raw material to a molten state, performing primary crystallization and primary filtration to obtain a crude vanadyl sulfate crystallization product and a crystallization residual liquid, performing sweating purification and centrifugal filtration on the crude vanadyl sulfate crystallization product to obtain a high-purity vanadyl sulfate product and a sweating residual liquid, and finally collecting and cooling the crystallization residual liquid and the sweating residual liquid to obtain a crude vanadyl sulfate byproduct.
Preferably, the specific steps are as follows:
the first step is as follows: melting
Heating vanadyl sulfate to temperature T1And keeping the temperature t at the temperature1Obtaining a molten liquid;
the second step is that: purification by crystallization
Cooling the molten liquid obtained in the step one at a cooling speed V1Cooling to a temperature T2And keeping the temperature t2Time; then filtering, separating to obtain knotCrystal products and crystallization residual liquid;
the third step: purification of sweating
Sweating and purifying the crystallized product obtained in the step two at the temperature of T2Rise to T3Temperature rise rate is V2And at T3Temperature t at temperature3Time; then carrying out centrifugal filtration treatment, and separating to obtain high-purity vanadyl sulfate and sweat-producing residues;
the fourth step: cooling down
And (4) collecting and cooling the crystallization residual liquid obtained in the step two and the sweating residual liquid obtained in the step three to obtain a cooling crystallization product, namely crude vanadyl sulfate.
Preferably, the temperature T in the first step1Between 105 and 120 ℃ and the heat preservation time t1The range is 30-120 min.
Preferably, the temperature T in the second step2At a cooling rate V of 50-104 DEG C10.01-5 ℃/min, and the heat preservation time t2The range is 5-120 min.
Preferably, the temperature T in the third step3At a temperature of 100-150 deg.C and a temperature raising rate V20.01-5 ℃/min, and the heat preservation time t3The range is 5-120 min.
Preferably, the purity of the vanadyl sulfate is 95-98%.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following remarkable effects:
(1) heating a vanadyl sulfate raw material to a molten state, crystallizing and filtering to obtain a crystallized product, namely crude vanadyl sulfate and a crystallized residual liquid, sweating, purifying and centrifugally filtering the crystallized product, namely the crude vanadyl sulfate to obtain a high-purity vanadyl sulfate crystallized product and a sweating residual liquid, and finally collecting and cooling the crystallized residual liquid and the sweating residual liquid to obtain the crude vanadyl sulfate; the vanadyl sulfate with low purity is used as a raw material for carrying out melting crystallization refining, other fluxes are not used in the whole process, so that the secondary pollution caused by other fluxes is avoided, the problems of cost and recovery of the added fluxes are not considered, the preparation cost of the vanadyl sulfate with high purity is effectively reduced, and the flow is shortened;
(2) the invention relates to a method for purifying vanadyl sulfate by melt crystallization, which comprises two stages of crystallization purification and sweating purification, can remove high-melting-point and low-melting-point impurities in vanadyl sulfate in stages, and can effectively separate high-purity vanadyl sulfate crystal products by combining centrifugal filtration after sweating purification, thereby avoiding impurity residual liquid which is mixed, occluded and adhered to the inner part and the surface of the crystal products, avoiding cost increase caused by repeated melt refining, and achieving the purposes of high efficiency, cleanness and energy-saving purification;
drawings
FIG. 1 is a flow chart of a method for purifying vanadyl sulfate by melt crystallization according to the invention.
Detailed Description
The detailed description and exemplary embodiments of the invention will be better understood when read in conjunction with the appended drawings, where the elements and features of the invention are identified by reference numerals.
Example 1
Referring to fig. 1, the method for separating vanadyl sulfate by two-stage melting crystallization in this embodiment includes the following steps: heating vanadyl sulfate raw materials to a molten state, performing primary crystallization and primary filtration to obtain a crude vanadyl sulfate crystallization product and a crystallization residual liquid, then performing sweating purification and centrifugal filtration on the crude vanadyl sulfate crystallization product to obtain a high-purity vanadyl sulfate product and a sweating residual liquid, and finally collecting and cooling the crystallization residual liquid and the sweating residual liquid to obtain a crude vanadyl sulfate byproduct. The method comprises the following specific steps:
the first step is as follows: melting
Heating vanadyl sulfate to 105 ℃, and preserving heat at the temperature for 30min to obtain molten liquid;
the second step is that: purification by crystallization
Cooling the molten liquid obtained in the step one to 104 ℃ at a cooling speed of 5 ℃/min, and preserving heat for 10 min; then filtering, and separating to obtain a crystallization product and a crystallization residual liquid;
the third step: purification of sweating
Sweating and purifying the crystallization product obtained in the step two, heating the temperature from 104 ℃ to 150 ℃, heating at the speed of 0.01 ℃/min, and keeping the temperature at 150 ℃ for 5 min; then carrying out centrifugal filtration treatment, and separating to obtain high-purity vanadyl sulfate and sweat-producing residues;
the fourth step: cooling down
And (4) collecting and cooling the crystallization residual liquid obtained in the step two and the sweating residual liquid obtained in the step three to obtain a cooling crystallization product, namely crude vanadyl sulfate. Crystallizing and filtering to obtain a crystallized product, namely crude vanadyl sulfate and a crystallized residual liquid, then sweating, purifying and centrifugally filtering the crystallized product, namely the crude vanadyl sulfate to obtain a high-purity vanadyl sulfate crystallized product and a sweating residual liquid, and finally collecting and cooling the crystallized residual liquid and the sweating residual liquid to obtain the crude vanadyl sulfate; the vanadyl sulfate with low purity is used as a raw material for carrying out melting crystallization refining, other fluxes are not used in the whole process, so that the secondary pollution caused by other fluxes is avoided, the problems of cost and recovery of the added fluxes are not considered, the preparation cost of the vanadyl sulfate with high purity is effectively reduced, and the flow is shortened; meanwhile, the melting crystallization method provided by the invention comprises two stages of crystallization purification and sweating purification, and can remove high-melting-point and low-melting-point impurities in vanadyl sulfate in stages, and further, the high-purity vanadyl sulfate crystal product can be effectively separated by combining centrifugal filtration after sweating purification, so that impurity residual liquid which is mixed, occluded and adhered to the inner part and the surface of the crystal product is avoided, the cost increase caused by repeated melting refining is also avoided, and the purposes of high efficiency, cleanness and energy-saving purification are achieved; the purity of the high-purity vanadyl sulfate extracted by the embodiment reaches 99.999%, and the yield of the high-purity vanadium pentoxide is 95%.
Example 2
Referring to fig. 1, the method for separating vanadyl sulfate by two-stage melting crystallization in this embodiment includes the following steps: heating vanadyl sulfate raw materials to a molten state, performing primary crystallization and primary filtration to obtain a crude vanadyl sulfate crystallization product and a crystallization residual liquid, then performing sweating purification and centrifugal filtration on the crude vanadyl sulfate crystallization product to obtain a high-purity vanadyl sulfate product and a sweating residual liquid, and finally collecting and cooling the crystallization residual liquid and the sweating residual liquid to obtain a crude vanadyl sulfate byproduct. The method comprises the following specific steps:
the first step is as follows: melting
Heating vanadyl sulfate to 110 ℃, and preserving heat at the temperature for 60min to obtain molten liquid;
the second step is that: purification by crystallization
Cooling the molten liquid obtained in the step one to 100 ℃ at a cooling speed of 0.1 ℃/min, and keeping the temperature for 100 min; then filtering, and separating to obtain a crystallization product and a crystallization residual liquid;
the third step: purification of sweating
Sweating and purifying the crystallization product obtained in the step two, heating the temperature from 100 ℃ to 120 ℃, heating the temperature at the speed of 0.1 ℃/min, and keeping the temperature at 150 ℃ for 30 min; then carrying out centrifugal filtration treatment, and separating to obtain high-purity vanadyl sulfate and sweat-producing residues;
the fourth step: cooling down
And (4) collecting and cooling the crystallization residual liquid obtained in the step two and the sweating residual liquid obtained in the step three to obtain a cooling crystallization product, namely crude vanadyl sulfate. Crystallizing and filtering to obtain a crystallized product, namely crude vanadyl sulfate and a crystallized residual liquid, then sweating, purifying and centrifugally filtering the crystallized product, namely the crude vanadyl sulfate to obtain a high-purity vanadyl sulfate crystallized product and a sweating residual liquid, and finally collecting and cooling the crystallized residual liquid and the sweating residual liquid to obtain the crude vanadyl sulfate; the vanadyl sulfate with low purity is used as a raw material for carrying out melting crystallization refining, other fluxes are not used in the whole process, so that the secondary pollution caused by other fluxes is avoided, the problems of cost and recovery of the added fluxes are not considered, the preparation cost of the vanadyl sulfate with high purity is effectively reduced, and the flow is shortened; meanwhile, the melting crystallization method provided by the invention comprises two stages of crystallization purification and sweating purification, and can remove high-melting-point and low-melting-point impurities in vanadyl sulfate in stages, and further, the high-purity vanadyl sulfate crystal product can be effectively separated by combining centrifugal filtration after sweating purification, so that impurity residual liquid which is mixed, occluded and adhered to the inner part and the surface of the crystal product is avoided, the cost increase caused by repeated melting refining is also avoided, and the purposes of high efficiency, cleanness and energy-saving purification are achieved; the purity of the high-purity vanadyl sulfate extracted by the embodiment reaches 99.999%, and the yield of the high-purity vanadium pentoxide is 98%.
Example 3
Referring to fig. 1, the method for separating vanadyl sulfate by two-stage melting crystallization in this embodiment includes the following steps: heating vanadyl sulfate raw materials to a molten state, performing primary crystallization and primary filtration to obtain a crude vanadyl sulfate crystallization product and a crystallization residual liquid, then performing sweating purification and centrifugal filtration on the crude vanadyl sulfate crystallization product to obtain a high-purity vanadyl sulfate product and a sweating residual liquid, and finally collecting and cooling the crystallization residual liquid and the sweating residual liquid to obtain a crude vanadyl sulfate byproduct. The method comprises the following specific steps:
the first step is as follows: melting
Heating vanadyl sulfate to 117 ℃, and preserving heat at the temperature for 105min to obtain molten liquid;
the second step is that: purification by crystallization
Cooling the molten liquid obtained in the step one to 85 ℃ at a cooling speed of 4.5 ℃/min, and preserving the temperature for 45 min; then filtering, and separating to obtain a crystallization product and a crystallization residual liquid;
the third step: purification of sweating
Sweating and purifying the crystallization product obtained in the step two, heating the temperature from 85 ℃ to 135 ℃, heating at the speed of 4.5 ℃/min, and keeping the temperature at 135 ℃ for 100 min; then carrying out centrifugal filtration treatment, and separating to obtain high-purity vanadyl sulfate and sweat-producing residues;
the fourth step: cooling down
And (4) collecting and cooling the crystallization residual liquid obtained in the step two and the sweating residual liquid obtained in the step three to obtain a cooling crystallization product, namely crude vanadyl sulfate. Crystallizing and filtering to obtain a crystallized product, namely crude vanadyl sulfate and a crystallized residual liquid, then sweating, purifying and centrifugally filtering the crystallized product, namely the crude vanadyl sulfate to obtain a high-purity vanadyl sulfate crystallized product and a sweating residual liquid, and finally collecting and cooling the crystallized residual liquid and the sweating residual liquid to obtain the crude vanadyl sulfate; the vanadyl sulfate with low purity is used as a raw material for carrying out melting crystallization refining, other fluxes are not used in the whole process, so that the secondary pollution caused by other fluxes is avoided, the problems of cost and recovery of the added fluxes are not considered, the preparation cost of the vanadyl sulfate with high purity is effectively reduced, and the flow is shortened; meanwhile, the melting crystallization method provided by the invention comprises two stages of crystallization purification and sweating purification, and can remove high-melting-point and low-melting-point impurities in vanadyl sulfate in stages, and further, the high-purity vanadyl sulfate crystal product can be effectively separated by combining centrifugal filtration after sweating purification, so that impurity residual liquid which is mixed, occluded and adhered to the inner part and the surface of the crystal product is avoided, the cost increase caused by repeated melting refining is also avoided, and the purposes of high efficiency, cleanness and energy-saving purification are achieved; the purity of the high-purity vanadyl sulfate extracted by the embodiment reaches 99.999%, and the yield of the high-purity vanadium pentoxide is 96.5%.
The invention has been described in detail hereinabove with reference to specific exemplary embodiments thereof. It will, however, be understood that various modifications and changes may be made without departing from the scope of the invention as defined in the appended claims. The detailed description and drawings are to be regarded as illustrative rather than restrictive, and any such modifications and variations are intended to be included within the scope of the present invention as described herein. Furthermore, the background is intended to be illustrative of the state of the art as developed and the meaning of the present technology and is not intended to limit the scope of the invention or the application and field of application of the invention.
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