CN117488061A - Method for removing iron from carbonated leaching solution - Google Patents
Method for removing iron from carbonated leaching solution Download PDFInfo
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- CN117488061A CN117488061A CN202311612012.5A CN202311612012A CN117488061A CN 117488061 A CN117488061 A CN 117488061A CN 202311612012 A CN202311612012 A CN 202311612012A CN 117488061 A CN117488061 A CN 117488061A
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- iron
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- leach liquor
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 230
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 113
- 238000000034 method Methods 0.000 title claims abstract description 72
- 238000002386 leaching Methods 0.000 title claims abstract description 56
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 36
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims abstract description 36
- 238000006243 chemical reaction Methods 0.000 claims abstract description 32
- 239000007788 liquid Substances 0.000 claims abstract description 31
- VTIIJXUACCWYHX-UHFFFAOYSA-L disodium;carboxylatooxy carbonate Chemical group [Na+].[Na+].[O-]C(=O)OOC([O-])=O VTIIJXUACCWYHX-UHFFFAOYSA-L 0.000 claims abstract description 23
- 229940045872 sodium percarbonate Drugs 0.000 claims abstract description 23
- 239000002893 slag Substances 0.000 claims abstract description 15
- 238000000926 separation method Methods 0.000 claims abstract description 13
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 10
- 238000003756 stirring Methods 0.000 claims abstract description 6
- 238000001556 precipitation Methods 0.000 claims description 10
- 230000035484 reaction time Effects 0.000 claims description 7
- -1 iron ions Chemical class 0.000 abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 17
- 150000002500 ions Chemical class 0.000 abstract description 8
- 239000012535 impurity Substances 0.000 abstract description 6
- 238000004064 recycling Methods 0.000 abstract description 6
- 238000000605 extraction Methods 0.000 abstract description 4
- 238000005272 metallurgy Methods 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 59
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 10
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 10
- 239000000047 product Substances 0.000 description 9
- 239000011734 sodium Substances 0.000 description 8
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical group C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 7
- 229910052708 sodium Inorganic materials 0.000 description 7
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 5
- 235000017557 sodium bicarbonate Nutrition 0.000 description 5
- 229910000029 sodium carbonate Inorganic materials 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 159000000000 sodium salts Chemical class 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000001590 oxidative effect Effects 0.000 description 3
- 230000001502 supplementing effect Effects 0.000 description 3
- 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 2
- UNTBPXHCXVWYOI-UHFFFAOYSA-O azanium;oxido(dioxo)vanadium Chemical compound [NH4+].[O-][V](=O)=O UNTBPXHCXVWYOI-UHFFFAOYSA-O 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- GNTDGMZSJNCJKK-UHFFFAOYSA-N divanadium pentaoxide Chemical compound O=[V](=O)O[V](=O)=O GNTDGMZSJNCJKK-UHFFFAOYSA-N 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 239000006228 supernatant Substances 0.000 description 2
- 229910001935 vanadium oxide Inorganic materials 0.000 description 2
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 description 2
- ONDPHDOFVYQSGI-UHFFFAOYSA-N zinc nitrate Chemical compound [Zn+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ONDPHDOFVYQSGI-UHFFFAOYSA-N 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 229910021586 Nickel(II) chloride Inorganic materials 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910052770 Uranium Inorganic materials 0.000 description 1
- WFISYBKOIKMYLZ-UHFFFAOYSA-N [V].[Cr] Chemical compound [V].[Cr] WFISYBKOIKMYLZ-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 239000001099 ammonium carbonate Substances 0.000 description 1
- 235000012501 ammonium carbonate Nutrition 0.000 description 1
- 230000002308 calcification Effects 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 159000000007 calcium salts Chemical class 0.000 description 1
- JYYOBHFYCIDXHH-UHFFFAOYSA-N carbonic acid;hydrate Chemical compound O.OC(O)=O JYYOBHFYCIDXHH-UHFFFAOYSA-N 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- QMMRZOWCJAIUJA-UHFFFAOYSA-L nickel dichloride Chemical compound Cl[Ni]Cl QMMRZOWCJAIUJA-UHFFFAOYSA-L 0.000 description 1
- LGQLOGILCSXPEA-UHFFFAOYSA-L nickel sulfate Chemical compound [Ni+2].[O-]S([O-])(=O)=O LGQLOGILCSXPEA-UHFFFAOYSA-L 0.000 description 1
- 229910000363 nickel(II) sulfate Inorganic materials 0.000 description 1
- KBJMLQFLOWQJNF-UHFFFAOYSA-N nickel(ii) nitrate Chemical compound [Ni+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O KBJMLQFLOWQJNF-UHFFFAOYSA-N 0.000 description 1
- YPJKMVATUPSWOH-UHFFFAOYSA-N nitrooxidanyl Chemical compound [O][N+]([O-])=O YPJKMVATUPSWOH-UHFFFAOYSA-N 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- MSFGZHUJTJBYFA-UHFFFAOYSA-M sodium dichloroisocyanurate Chemical compound [Na+].ClN1C(=O)[N-]C(=O)N(Cl)C1=O MSFGZHUJTJBYFA-UHFFFAOYSA-M 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- VQBIMXHWYSRDLF-UHFFFAOYSA-M sodium;azane;hydrogen carbonate Chemical compound [NH4+].[Na+].[O-]C([O-])=O VQBIMXHWYSRDLF-UHFFFAOYSA-M 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 235000005074 zinc chloride Nutrition 0.000 description 1
- 239000011592 zinc chloride Substances 0.000 description 1
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 1
- 229910000368 zinc sulfate Inorganic materials 0.000 description 1
- 229960001763 zinc sulfate Drugs 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/005—Preliminary treatment of scrap
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B34/00—Obtaining refractory metals
- C22B34/20—Obtaining niobium, tantalum or vanadium
- C22B34/22—Obtaining vanadium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/006—Wet processes
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention belongs to the technical field of vanadium extraction metallurgy, and particularly relates to a method for removing iron from carbonating leaching liquid. The invention provides a method for removing iron from carbonated leaching solution, which comprises the following steps: a, adding an iron removing agent into the carbonatated leaching solution, stirring, and carrying out iron removal reaction; b, after the iron removal reaction is finished, carrying out solid-liquid separation to obtain iron-removed liquid and iron-removed slag; in the step a, the iron remover is sodium percarbonate. The method utilizes sodium percarbonate to remove iron ions in the leaching solution, thereby solving the influence of the iron ions on the quality of vanadium products; harmful ions are not introduced in the impurity removal process, and the recycling of the process water is not influenced.
Description
Technical Field
The invention belongs to the technical field of vanadium extraction metallurgy, and particularly relates to a method for removing iron from carbonating leaching liquid.
Background
Vanadium slag isThe traditional industrialization technology is sodium roasting-water leaching vanadium extraction. The process has the advantages that the roasting additive sodium carbonate is large in dosage and high in water treatment cost, so that the production cost of vanadium oxide is high; in the process of treating vanadium precipitation wastewater, a large amount of refractory solid wastes such as vanadium-chromium filter cakes, sodium sulfate and the like can be generated, and the environmental protection risk is high. In order to solve the problems of high production cost, high environmental protection risk and the like of the existing vanadium oxide, a technological thought for extracting vanadium by calcified roasting-carbonating leaching of vanadium slag is provided, such as: a. uniformly mixing vanadium slag with calcium salt and roasting to obtain roasting clinker; b. adding water, sodium carbonate and ammonium carbonate into the roasted clinker for leaching, and carrying out solid-liquid separation to obtain leaching liquid; the dosage of the sodium carbonate is 1.0 to 1.5 times of the molar quantity of vanadium in the roasting clinker calculated by Na; the ammonium-containing carbonate is used in the form of CO 3 2- 1.5 to 2.5 times of the molar weight of vanadium in the roasting clinker; c. adding a desilication agent into the leaching solution, carrying out solid-liquid separation to obtain a solution after desilication, precipitating vanadium, carrying out solid-liquid separation to obtain ammonium metavanadate and a vanadium precipitation supernatant, and calcining the ammonium metavanadate to obtain vanadium pentoxide. See the invention patent application with publication number CN110106344A for specific technical process. In the carbonation leaching process of the vanadium-containing clinker, as the concentration of liquid ammonia at the upper layer of the vanadium-precipitating leaching agent is higher, a small amount of iron is dissolved into the leaching liquid and stably exists, which is not beneficial to preparing the vanadium product with low iron content and affects the application of the vanadium product in non-steel fields.
Aiming at the problem of iron removal of carbonated leaching liquid, the invention patent application with publication number of CN116555591A provides an iron removal method of carbonated vanadium leaching liquid, wherein one or a mixture of nickel sulfate, nickel chloride and nickel nitrate in any ratio is added for iron removal; the invention patent application with publication number of CN116656949A provides a method for removing impurities from a carbonated vanadium immersion liquid, which comprises the step of adding reagents such as zinc sulfate, zinc chloride, zinc nitrate and the like to remove iron. Because the iron removing reagent introduces sulfate radical, chloride radical, nitrate radical and other ions into a solution system, the technical requirement of recycling process water in the vanadium slag calcification roasting-carbonation leaching vanadium extraction process cannot be met.
Aiming at the problem of iron removal of neutral and alkaline solutions, the publication discloses a research on iron removal of neutral leaching uranium leaching solution, which adopts sodium dichloroisocyanurate as an oxidant and polyaluminium chloride as a flocculant to reduce the iron concentration in the leaching solution to below 1 mg/L. The method can reduce the iron concentration in the solution, but has the problem of low treatment efficiency, and is difficult to be applied to large-scale industry.
Aiming at the technical problem of how to remove iron ions under the condition of not influencing the cyclic utilization of process water of alkaline carbonation leaching solution, no related technical report which can effectively solve the problem and has industrialized application prospect is yet seen.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for removing iron from carbonated leaching solution, which at least can solve the problem of poor iron removing effect of the existing method for removing iron from the leaching solution.
According to the method for removing iron from the carbonated leaching solution, disclosed by the invention, iron ions in the leaching solution are removed by using sodium percarbonate, so that the influence of the iron ions on the quality of vanadium products is solved; and no harmful ions are introduced in the impurity removal process, so that the recycling of the process water is not affected. The method specifically comprises the following steps:
a, adding an iron removing agent into the carbonatated leaching solution, stirring, and carrying out iron removal reaction;
b, after the iron removal reaction is finished, carrying out solid-liquid separation to obtain iron-removed liquid and iron-removed slag;
in the step a, the iron remover is sodium percarbonate. Because the process for extracting vanadium by calcified roasting-carbonating leaching of vanadium slag takes away a small amount of sodium by the residue, a small amount of sodium carbonate or sodium bicarbonate needs to be supplemented to a process system to maintain the stability of the concentration of sodium in solution.
Further, in step a of the method for removing iron from a carbonated leach solution, the iron removal reaction is performed under alkaline conditions. Tool withIn bulk, the pH value of the carbonated leaching solution is between 9 and 10. The concentration of hydroxide ions is high in an alkaline environment. When hydroxyl ions react with iron ions, fe (OH) insoluble in water is produced 3 Precipitation, thereby achieving the aim of removing iron.
Further, in the step a of the method for removing iron from the carbonated leaching solution, the carbonated leaching solution is obtained by reacting vanadium slag blank or calcified roasting clinker with vanadium precipitation upper layer liquid. The carbonatated leaching liquid contains a small amount of Fe 2+ . Sodium percarbonate is selected to remove iron, firstly, the sodium percarbonate has oxidizing property, and Fe can be added under alkaline condition 2+ Oxidation to Fe 3+ Due to Fe (OH) 3 Specific Fe (OH) 2 The pH of the precipitate is low, the solubility product is small, and therefore, the oxidized Fe 3+ The purpose of removal can be achieved by precipitation. Secondly, the introduction of sodium percarbonate does not affect the harmful ions of the process water circulation, and a special sodium salt supplementing process can be omitted.
Further, in the step a of the method for removing iron from the carbonated leaching solution, the reaction temperature for removing iron from the carbonated leaching solution is 30-60 ℃. The effect is to avoid the influence of too high decomposition speed of sodium bicarbonate on Fe due to high temperature of the leaching solution 2+ Is a combination of the oxidation effect of (a) and (b).
Further, in the step a of the method for removing iron from the carbonated leaching solution, the iron removal reaction time is 20-60 min, and the iron removal reaction time is used for ensuring Fe in the leaching solution 2+ Fully oxidized into Fe by sodium percarbonate 3+ The iron element in the material can be effectively removed.
Further, in step a of the method for removing iron from the carbonated leaching solution, the amount of the iron remover in step a is 2-4 times of the theoretical amount.
Further, in step a of the method for removing iron from a carbonated leach solution, an iron removal reaction is required when TFe in the carbonated leach solution reaches 0.05 g/L.
Further, in step a of the method for deironing a carbonated leach solution, the pH of the carbonated leach solution is between 9 and 10.
Further, in the step a of the method for removing iron from the carbonated leach solution, the higher the reaction temperature is, the more sodium percarbonate is added and the stirring reaction time is reduced.
Further, in the step b of the method for removing iron from the carbonated leaching solution, standing for a preset time after the iron removal reaction is finished, so as to realize solid-liquid separation.
The beneficial effects of the invention are as follows: the method utilizes sodium percarbonate to remove iron ions in the leaching solution, thereby solving the influence of the iron ions on the quality of vanadium products; harmful ions are not introduced in the impurity removal process, and the recycling of the process water is not influenced. Because the process for extracting vanadium by calcified roasting-carbonating leaching of vanadium slag takes away a small amount of sodium by the residue, a small amount of sodium carbonate or sodium bicarbonate needs to be supplemented to a process system to maintain the stability of the concentration of sodium in solution.
Drawings
Fig. 1 shows a schematic flow chart of a method for removing iron from a carbonated leach solution provided by the present invention.
Detailed Description
It should be understood that the embodiments of the invention shown in the exemplary embodiments are only illustrative. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art will readily appreciate that many modifications are possible without materially departing from the teachings of the subject matter of this disclosure. Accordingly, all such modifications are intended to be included within the scope of present invention. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and parameters of the exemplary embodiments without departing from the spirit of the present inventions.
The method for removing iron from the carbonatated leaching solution provided by the embodiment of the invention, as shown in figure 1, comprises the following steps:
a, adding an iron removing agent into the carbonatated leaching solution, stirring, and carrying out iron removal reaction;
b, after the iron removal reaction is finished, carrying out solid-liquid separation to obtain iron-removed liquid and iron-removed slag;
in the step a, the iron remover is sodium percarbonate.
According to the scheme, the sodium percarbonate is used for removing iron ions in the leaching solution, so that the influence of the iron ions on the quality of vanadium products is solved; compared with the prior art, no harmful ions are introduced in the impurity removal process, and the recycling of the process water is not influenced. Because the process for extracting vanadium by calcified roasting-carbonating leaching of vanadium slag takes away a small amount of sodium by the residue, a small amount of sodium carbonate or sodium bicarbonate needs to be supplemented to a process system to maintain the stability of the concentration of sodium in solution.
In some embodiments, in step a of the method of removing iron from a carbonated leach solution, the iron removal reaction is performed under alkaline conditions. The concentration of hydroxide ions is high in an alkaline environment. When hydroxyl ions react with iron ions, fe (OH) insoluble in water is produced 3 Precipitation, thereby achieving the aim of removing iron.
In some embodiments, in step a of the method for removing iron from a carbonated leach solution, the carbonated leach solution is obtained by reacting a vanadium slag blank or calcified roasting clinker with a vanadium precipitation supernatant. The carbonatated leaching liquid contains a small amount of Fe 2+ . Sodium percarbonate is selected to remove iron, firstly, the sodium percarbonate has oxidizing property, and Fe can be added under alkaline condition 2+ Oxidation to Fe 3+ Due to Fe (OH) 3 Specific Fe (OH) 2 The precipitation pH is low, and the solubility product is small, so that the iron removal purpose can be achieved by a precipitation mode. Secondly, the introduction of sodium percarbonate does not affect harmful ions of process water circulation, and simultaneously, a special sodium salt supplementing process can be omitted.
In some embodiments, in step a of the method for removing iron from a carbonated leach solution, the carbonated leach solution is subjected to a reaction temperature of 30-60 ℃ in order to avoid the influence of excessive sodium bicarbonate decomposition rate on Fe due to high leach solution temperature 2+ Is a combination of the oxidation effect of (a) and (b).
In some embodiments, in step a of the method for removing iron from a carbonated leach solution, the iron removal reaction time is between 20 and 60 minutes, which is used to ensure that the Fe in the leach solution is 2+ Fully oxidized into Fe by sodium percarbonate 3+ 。
In some embodiments, in the step a of the method for removing iron from the carbonated leaching solution, the amount of the iron remover is 2-4 times of the theoretical amount, so as to ensure that the iron removal reaction can be fully performed and improve the iron removal efficiency. Wherein the theoretical amount is the amount of the iron removing agent calculated according to the mole ratio of substances in the chemical reaction equation. However, the actual amount is usually larger than the theoretical amount because in the actual operation, various factors such as reaction efficiency, equipment loss, operation failure, etc. need to be considered. If the design amount and the theoretical amount are different, the product quality may be unstable and even a quality problem may occur. Therefore, when the theoretical amount is used as a production guide, it is necessary to adjust the amount in accordance with the actual situation. The consumption of the iron removing agent is increased, so that the loss in actual operation can be made up, the iron removing reaction is ensured to be fully carried out, and the iron removing efficiency is improved.
In some embodiments, in step a of the method of deferrizing a carbonated leach solution, the deferrization reaction is required when TFe in the carbonated leach solution reaches 0.05 g/L.
In some embodiments, in step a of the method of deironing a carbonated leach solution, the pH of the carbonated leach solution is between 9 and 10.
In some embodiments, in step a of the method of iron removal from a carbonated leach solution, the higher the reaction temperature, the more sodium percarbonate addition is required and the agitation reaction time is reduced for an equivalent amount of carbonated leach solution.
In some embodiments, in step b of the method of removing iron from a carbonated leach solution, the leach solution is left for a predetermined period of time, such as 30 minutes, after the iron removal reaction is completed, to facilitate separation of the iron-removed slag from the post-iron liquor.
For ease of illustration, the invention is further described in detail by the following specific examples:
example 1
400mL of carbonated leaching solution (TFe 0.25g/L, pH 9.43) is kept at a constant temperature of 35 ℃ by utilizing a water bath, 0.23g of sodium percarbonate is added and stirred for reaction for 60min; standing for 30min after the reaction is finished, and carrying out solid-liquid separation to obtain a liquid TFe after iron removal which is less than 0.01g/L and has the iron removal rate of more than 96%.
Example 2
400mL of carbonated leaching solution (TFe 0.25g/L, pH 9.43) is kept at a constant temperature of 45 ℃ by utilizing a water bath, 0.28g of sodium percarbonate is added and stirred for reaction for 40min; standing for 30min after the reaction is finished, and carrying out solid-liquid separation to obtain a liquid TFe after iron removal which is less than 0.01g/L and has the iron removal rate of more than 96%.
Example 3
400mL of carbonated leaching solution (TFe 0.25g/L, pH 9.43) is kept at a constant temperature of 55 ℃ by utilizing a water bath, 0.37g of sodium percarbonate is added and stirred for reaction for 20min; standing for 30min after the reaction is finished, and carrying out solid-liquid separation to obtain a liquid TFe after iron removal which is less than 0.01g/L and has the iron removal rate of more than 96%.
In summary, according to the method for removing iron from the carbonated leaching solution, the sodium percarbonate is used for removing iron ions in the carbonated leaching solution, so that the influence of the iron ions on the quality of vanadium products is solved; harmful ions are not introduced in the impurity removal process, so that the recycling of the process water is not influenced; the invention supplements sodium salt while removing iron, and omits the special sodium salt supplementing process.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention; modifications and equivalent substitutions are intended to be included in the scope of the claims without departing from the spirit and scope of the present invention.
It is to be understood that the technical features listed above for the different embodiments may be combined with each other, where technically feasible, to form further embodiments within the scope of the invention.
The above examples are possible examples of embodiments of the present invention and are given only for the purpose of clearly understanding the principle of the present invention to those skilled in the art. Those skilled in the art will appreciate that: the above discussion of any embodiment is merely exemplary and is not intended to imply that the scope of the disclosure of embodiments of the invention, including the claims, is limited to such examples. The technical features of the above embodiments or in different embodiments can also be combined with each other under the general inventive concept and many other variations of the different aspects of the embodiments of the invention as described above are produced, which are not provided in the detailed description for the sake of brevity. Therefore, any omissions, modifications, equivalents, improvements and others that are within the spirit and principles of the embodiments are intended to be included within the scope of the invention as claimed.
Claims (10)
1. A method for removing iron from a carbonated leach solution, comprising the steps of:
a, adding an iron removing agent into the carbonatated leaching solution, stirring, and carrying out iron removal reaction;
b, after the iron removal reaction is finished, carrying out solid-liquid separation to obtain iron-removed liquid and iron-removed slag;
in the step a, the iron removing agent is sodium percarbonate.
2. The method for removing iron from carbonated leach liquor of claim 1, wherein,
in step a, the iron removal reaction is performed under alkaline conditions.
3. The method for removing iron from carbonated leach liquor of claim 1, wherein,
in the step a, the carbonation leaching liquid is obtained by reacting vanadium slag blank or calcified roasting clinker with vanadium precipitation upper layer liquid.
4. The method for removing iron from carbonated leach liquor of claim 1, wherein,
in the step a, the iron removal reaction temperature of the carbonated leaching solution is 30-60 ℃.
5. The method for removing iron from carbonated leach liquor of claim 1, wherein,
in the step a, the iron removal reaction time is 20-60 min.
6. The method for removing iron from carbonated leach liquor of claim 1, wherein,
in the step a, the dosage of the iron removing agent is 2-4 times of the theoretical dosage.
7. The method for removing iron from carbonated leach liquor of claim 1, wherein,
in step a, iron removal is required when TFe > 0.05g/L in the carbonated leach solution.
8. The method for removing iron from carbonated leach liquor of claim 1, wherein,
in the step a, the pH of the carbonatated leaching solution is between 9 and 10.
9. The method for removing iron from carbonated leach liquor according to claim 1, wherein in step a, the higher the reaction temperature, the more sodium percarbonate is added and the stirring reaction time is reduced for the same amount of carbonated leach liquor.
10. The method for removing iron from carbonated leach liquor of claim 1, wherein,
in the step b, standing for a preset time after the iron removal reaction is finished, so as to realize solid-liquid separation.
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