CN113912095A - Precipitation desulfurization method for high-sulfur bauxite leaching solution - Google Patents
Precipitation desulfurization method for high-sulfur bauxite leaching solution Download PDFInfo
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- CN113912095A CN113912095A CN202111230466.7A CN202111230466A CN113912095A CN 113912095 A CN113912095 A CN 113912095A CN 202111230466 A CN202111230466 A CN 202111230466A CN 113912095 A CN113912095 A CN 113912095A
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- sulfur
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- calcium
- leaching
- sulfur bauxite
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- 239000011593 sulfur Substances 0.000 title claims abstract description 112
- 229910052717 sulfur Inorganic materials 0.000 title claims abstract description 112
- 229910001570 bauxite Inorganic materials 0.000 title claims abstract description 49
- 238000002386 leaching Methods 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000006477 desulfuration reaction Methods 0.000 title claims description 17
- 230000023556 desulfurization Effects 0.000 title claims description 17
- 238000001556 precipitation Methods 0.000 title claims description 14
- 239000000243 solution Substances 0.000 claims abstract description 66
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 56
- 239000007788 liquid Substances 0.000 claims abstract description 39
- 239000002244 precipitate Substances 0.000 claims abstract description 25
- 239000000706 filtrate Substances 0.000 claims abstract description 19
- 239000012716 precipitator Substances 0.000 claims abstract description 15
- 238000003756 stirring Methods 0.000 claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000005406 washing Methods 0.000 claims abstract description 9
- 238000001816 cooling Methods 0.000 claims abstract description 7
- 238000001914 filtration Methods 0.000 claims abstract description 7
- 238000009835 boiling Methods 0.000 claims abstract description 3
- 239000011259 mixed solution Substances 0.000 claims abstract description 3
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 claims description 6
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 6
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 3
- VSGNNIFQASZAOI-UHFFFAOYSA-L calcium acetate Chemical compound [Ca+2].CC([O-])=O.CC([O-])=O VSGNNIFQASZAOI-UHFFFAOYSA-L 0.000 claims description 3
- 239000001639 calcium acetate Substances 0.000 claims description 3
- 229960005147 calcium acetate Drugs 0.000 claims description 3
- 235000011092 calcium acetate Nutrition 0.000 claims description 3
- 239000001110 calcium chloride Substances 0.000 claims description 3
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 3
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 3
- 229910001634 calcium fluoride Inorganic materials 0.000 claims description 3
- 239000000920 calcium hydroxide Substances 0.000 claims description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 3
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 3
- 239000000292 calcium oxide Substances 0.000 claims description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 3
- 239000001506 calcium phosphate Substances 0.000 claims description 3
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 3
- 239000001095 magnesium carbonate Substances 0.000 claims description 3
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 3
- 239000000395 magnesium oxide Substances 0.000 claims description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 3
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 3
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 claims description 3
- 229940078499 tricalcium phosphate Drugs 0.000 claims description 3
- 229910000391 tricalcium phosphate Inorganic materials 0.000 claims description 3
- 235000019731 tricalcium phosphate Nutrition 0.000 claims description 3
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 claims description 3
- 229960001763 zinc sulfate Drugs 0.000 claims description 3
- 229910000368 zinc sulfate Inorganic materials 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- 239000010439 graphite Substances 0.000 claims description 2
- 229910002804 graphite Inorganic materials 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 6
- 230000001376 precipitating effect Effects 0.000 abstract description 6
- 229910052782 aluminium Inorganic materials 0.000 abstract description 5
- 238000003723 Smelting Methods 0.000 abstract description 3
- 238000004131 Bayer process Methods 0.000 abstract description 2
- 230000008569 process Effects 0.000 abstract description 2
- 238000000926 separation method Methods 0.000 abstract description 2
- 150000002500 ions Chemical class 0.000 description 46
- -1 sulfur ions Chemical class 0.000 description 12
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 description 10
- 229910001388 sodium aluminate Inorganic materials 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 5
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 4
- UISHMWJBGGDOII-UHFFFAOYSA-L S(=S)(=O)([O-])[O-].[Na+].[I+] Chemical compound S(=S)(=O)([O-])[O-].[Na+].[I+] UISHMWJBGGDOII-UHFFFAOYSA-L 0.000 description 4
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000007654 immersion Methods 0.000 description 4
- 239000011630 iodine Substances 0.000 description 4
- 229910052740 iodine Inorganic materials 0.000 description 4
- 238000004448 titration Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 3
- 239000000084 colloidal system Substances 0.000 description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- DHCDFWKWKRSZHF-UHFFFAOYSA-L thiosulfate(2-) Chemical compound [O-]S([S-])(=O)=O DHCDFWKWKRSZHF-UHFFFAOYSA-L 0.000 description 3
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- RQPZNWPYLFFXCP-UHFFFAOYSA-L barium dihydroxide Chemical compound [OH-].[OH-].[Ba+2] RQPZNWPYLFFXCP-UHFFFAOYSA-L 0.000 description 2
- 229910001863 barium hydroxide Inorganic materials 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound 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 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229960004887 ferric hydroxide Drugs 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- IEECXTSVVFWGSE-UHFFFAOYSA-M iron(3+);oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Fe+3] IEECXTSVVFWGSE-UHFFFAOYSA-M 0.000 description 1
- 239000011344 liquid material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 150000004763 sulfides Chemical class 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical compound [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/46—Purification of aluminium oxide, aluminium hydroxide or aluminates
- C01F7/47—Purification of aluminium oxide, aluminium hydroxide or aluminates of aluminates, e.g. removal of compounds of Si, Fe, Ga or of organic compounds from Bayer process liquors
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a method for precipitating and removing sulfur in a leaching solution of a high-sulfur bauxite Bayer process, belonging to the technical field of aluminum smelting. Placing the leaching solution of the high-sulfur bauxite in a U-shaped container, and taking out the feed liquid connected to one end of the positive electrode after direct current is applied for 5-6 hours; dissolving a precipitator in water according to the proportion of 5-50g/L, dropwise adding the precipitator solution into the feed liquid, and stirring to fully precipitate; heating and boiling the obtained mixed solution for 0.5-1 hour, and stirring continuously; and cooling and filtering the heated solution, washing the precipitate with water to obtain sulfur-containing filter residue, and feeding the filtrate into a subsequent aluminum smelting process. The method disclosed by the invention is simple to operate, has high separation efficiency, can reduce the burden of subsequent treatment of the leaching tail liquid, and reduces the production cost.
Description
Technical Field
The invention relates to a precipitation desulfurization method for a high-sulfur bauxite leaching solution, belonging to the technical field of aluminum smelting.
Background
With the increasing demand of China for metallic aluminum in recent years, the improvement of the yield of aluminum oxide which is a raw material for producing aluminum becomes extremely critical, bauxite is a main ore source of aluminum oxide, but the bauxite has the problem of high sulfur content, and when the bauxite is used for producing the aluminum oxide, a large amount of S exists in a sodium aluminate solution obtained by leaching high-sulfur bauxite through a Bayer process2-、SO3 2-、S2O3 2-The content of sulfur-containing ions in the leaching solution is about 3g/L, so that the viscosity of the leaching solution is increased, the production process of alumina is influenced, and the yield of the alumina is reduced. In the immersion liquid environment, sulfur ions and alkali generate sodium sulfate to decompose main components of the immersion liquid, thiosulfate radical oxidizes metals to generate ferric hydroxide colloid to increase the solution viscosity, so that the red mud separation and sedimentation speed is reduced, sulfite radical is converted into sulfate radical in the solution environment to increase the acidity of the immersion liquid, and the corrosion of production equipment is caused.
In order to effectively remove sulfur in high-sulfur bauxite, improve the production efficiency of aluminum and save the production cost, a patent (CN 105460962A) carries out desulfurization by adding barium hydroxide solution in the production process, but the added barium hydroxide is high in amount, the reagent consumption is large, and the production cost is high. In addition, in a patent (CN 102897812 a), the method of activating high-sulfur bauxite by a low-temperature roasting desulfurization method is adopted to desulfurize the mineral powder by introducing 650-900 ℃ hot air into the environment of 500-600 ℃ so as to change sulfur in the high-sulfur bauxite into sulfur dioxide to remove sulfur. In another patent (see patent CN 102534189A for details), desulfurization is carried out by microwave heating roasting, but the problem of environmental pollution caused by sulfur dioxide generated after roasting is solved, and the subsequent flow is complicated. Other bauxite immersion fluid desulfurization methods have the problems of large reagent amount, complicated steps, large environmental pollution and the like.
Disclosure of Invention
The invention aims to provide a precipitation desulfurization method for a high-sulfur bauxite leaching solution, which aims to solve the problem of high sulfur content in the bauxite leaching solution.
In order to achieve the purpose, the invention adopts the following technical scheme:
(1) and (3) placing the leaching solution of the high-sulfur bauxite in a U-shaped container, respectively connecting graphite electrodes with direct current to two ends of the U-shaped container, electrifying for 5-6 hours, and taking out the feed liquid connected to one end of the positive electrode.
(2) Dissolving the precipitant in water at a ratio of 5-50g/L, dripping the precipitant solution into the feed liquid, and stirring to fully precipitate.
(3) And (3) heating and boiling the mixed solution obtained in the step (2) for 0.5-1 hour, and stirring during heating, wherein the temperature is the actual environmental temperature of the high-sulfur bauxite leaching solution.
(4) And cooling and filtering the heated solution, washing the precipitate with water to obtain sulfur-containing filter residue, retaining the first filtrate, and measuring sulfur-containing ions in the solution.
Preferably, the direct current in step (1) of the present invention is 10 to 25V.
After the leaching solution of the high-sulfur bauxite is connected to the electrode, the solution can present different colors after being electrified for a period of time, the solution is reddish black close to the anode and is light red close to the cathode, the reddish black of the anode part is taken as a feed liquid, and the preferred feed liquid is 30-35% of the total volume of the leaching solution of the high-sulfur bauxite.
Preferably, the precipitant used in step (2) of the present invention is one or more of calcium sulfate, calcium oxide, calcium fluoride, tricalcium phosphate, calcium acetate, calcium chloride, calcium hydroxide, magnesium carbonate, magnesium oxide, zinc sulfate, and aluminum chloride, which are mixed in any proportion.
Preferably, the volume ratio of the precipitant solution to the feed liquid in step (2) of the present invention is 1: 1.
Preferably, the number of times of washing the precipitate in step (3) of the present invention with water is not less than 2.
The principle of the invention is as follows: the leaching solution of the high-sulfur bauxite is a sulfur-containing compound colloid, sulfur-containing charged ions in the sodium aluminate solution are enriched by utilizing the electrophoretic property of the colloid after direct current is introduced, a reagent is added according to the difference of solubility products between sulfur indissolvable substances to precipitate the sulfur ions, and the solubility of the indissolvable sulfides is reduced by utilizing the influence of the same ion effect on the solubility of the sulfur indissolvable substances, so that the aim of desulfurization is fulfilled.
The invention has the beneficial effects that:
(1) the invention can effectively precipitate the sulfur-containing ions in the leaching tail liquid of the high-sulfur bauxite by adding the precipitator, thereby reducing the amount of the sulfur-containing ions in the sodium metaaluminate solution.
(2) The invention relates to a feed liquid pretreatment process flow, but the operation is simple and easy, and the cost is greatly saved; the used precipitator has small dosage, low price, strong stability and small toxicity, is beneficial to large-scale application, and the reaction temperature environment is similar to the actual leaching temperature of the ore pulp, thereby being beneficial to large-scale application.
The leachate of the invention enriches sulfur-containing ions through direct current, and the precipitator is added to generate sulfur-containing precipitates, so that the mutual cooperation of the two can efficiently and quickly realize the desulfurization effect.
Detailed Description
The present invention will be further described with reference to the following detailed description, but the scope of the present invention is not limited to the description.
Example 1
In this embodiment, different precipitants and different concentrations are used for removing sulfur ions in the sodium aluminate solution after leaching of the high-sulfur bauxite, and the method comprises the following steps:
(1) taking the positive electrode part solution as feed liquid after the high-sulfur bauxite leaching tail liquid passes through 25V direct current for 6 hours,
(2) different precipitants are weighed to prepare a precipitant solution, and the precipitant solution is dripped into 1L of feed liquid and stirred to form precipitate.
(3) Heating the precipitate to boil for 0.5-1 hr while stirring.
(4) And cooling and filtering the heated solution, washing the precipitate with water twice to obtain sulfur-containing filter residues, and reserving the original filtrate for measuring sulfur-containing ions in the filtrate.
Measuring the raw filtrate in the step (4) by using an iodine-sodium thiosulfate titration method, and calculating the sulfur-containing ions (S) in the high-sulfur bauxite leaching tail liquid by using the difference of the reaction conditions of the three ions and iodine2-、SO3-、S2O3 2-) Concentration; and (4) comparing the concentration of the sulfur-containing ions in the feed liquid (the calculation method is the same as that of the original filtrate), and calculating to obtain the removal rate of the sulfur-containing ions.
In this example, different precipitants are used for removing sulfur ions in the sodium aluminate solution after leaching of the high-sulfur bauxite, and the removal rates of the sulfur ions by the different precipitants are shown in table 1.
TABLE 1
It can be seen from table 1 that the selection of the precipitating agent has a great influence on the removal rate of the sulfur-containing ions, the concentration of the precipitating agent also has a certain influence on the removal rate of the sulfur-containing ions, some precipitating agents have high concentration but low removal rate of the sulfur-containing ions, and some precipitating agents have low concentration but high removal rate of the sulfur-containing ions, which is determined by the difference of solubility products between the sulfide precipitate and the added precipitating agent.
Example 2
The method adopts different concentrations of the same precipitant for removing sulfur ions in the sodium aluminate solution after leaching the high-sulfur bauxite, and comprises the following steps:
(1) taking the positive electrode part solution as feed liquid after the high-sulfur bauxite leaching tail liquid passes through 25V direct current for 6 hours,
(2) weighing precipitant to prepare precipitant solutions with different concentrations, adding dropwise into 1L of the solution, and stirring to form precipitate.
(3) Heating the precipitate to boil for 0.5-1 hr while stirring.
(4) And cooling and filtering the heated solution, washing the precipitate with water twice to obtain sulfur-containing filter residues, and reserving the original filtrate for measuring sulfur-containing ions in the filtrate.
Measuring the raw filtrate in the step (4) by using an iodine-sodium thiosulfate titration method, and calculating the sulfur-containing ions (S) in the high-sulfur bauxite leaching tail liquid by using the difference of the reaction conditions of the three ions and iodine2-、SO3-、S2O3 2-) Concentration; and (4) comparing the concentration of the sulfur-containing ions in the feed liquid (the calculation method is the same as that of the original filtrate), and calculating to obtain the removal rate of the sulfur-containing ions.
In this example, the same precipitant with different concentrations is used for removing sulfur ions from the leached sodium aluminate solution of high-sulfur bauxite, and the removal rate of the sulfur ions by the same precipitant with different concentrations is shown in table 2.
TABLE 2
As can be seen from Table 2, the concentration of the precipitant greatly affects the removal rate of the sulfur-containing ions, because the precipitant provides the ions required for the precipitation of the sulfur-containing ions, the higher the concentration of the sulfur-containing ions in the feed liquid is, the higher the precipitant ions to be provided are, the two react with each other to form a precipitate, and no precipitate is generated when the precipitation dissolution balance is reached, at which time the removal rate of the sulfur-containing ions reaches the highest.
Example 3
In this embodiment, whether the leaching solution of the high-sulfur bauxite is electrified or not and whether a precipitator is added for removing sulfur ions in the sodium aluminate solution after the leaching of the high-sulfur bauxite or not is adopted, includes the following steps:
(1) one part of the high-sulfur bauxite leaching tail liquid is subjected to 25V direct current for 6 hours, then the positive electrode part of the solution is taken as feed liquid, and the other part of the high-sulfur bauxite leaching tail liquid is not electrified and is taken as raw material liquid
(2) Weighing a certain amount of precipitant to prepare solution, dripping the solution into 1L of feed liquid or raw material liquid, stirring to form precipitate,
(3) heating the precipitation solution to boil for 1 hour, and stirring in due time during heating;
(4) and cooling and filtering the heated solution, washing the precipitate with water twice to obtain sulfur-containing filter residues, and reserving the original filtrate for measuring sulfur-containing ions in the filtrate.
Measuring the original filtrate in the step (4) by using an iodine-sodium thiosulfate titration method, and calculating the concentration of sulfur-containing ions (S2-, SO 3-and S2O32-) in the tail liquor of the high-sulfur bauxite leaching by using the difference of the reaction conditions of the three ions and iodine; and (4) comparing the concentration of the sulfur-containing ions in the feed liquid (the calculation method is the same as that of the original filtrate), and calculating to obtain the removal rate of the sulfur-containing ions.
In this embodiment, whether the leaching solution of the high-sulfur bauxite is electrified or not and whether a precipitator is added for removing sulfur-containing ions in the sodium aluminate solution after the leaching of the high-sulfur bauxite are adopted is shown in table 3.
TABLE 3
As can be seen from Table 3, the high-sulfur bauxite leaching solution has no good effect on removing sulfur-containing ions only by electrifying and not adding a precipitator; compared with the method of only electrifying, the method has the advantages that the removal rate of the sulfur-containing ions is slightly improved by only adding the precipitator into the leachate, but the removal rate of the sulfur-containing ions is obviously improved by electrifying the leachate and adding the precipitator into the leachate, because the leachate is electrified to enrich the sulfur-containing ions, the precipitator is added into the leachate after the concentration of the sulfur-containing ions is increased to form sulfide precipitates, and the removal rate of the sulfur-containing ions is obviously improved by the mutual cooperation of the two precipitates.
Example 4
In the embodiment, a plurality of precipitants are used together for removing sulfur ions in sodium aluminate solution after leaching of high-sulfur bauxite, and the method comprises the following steps:
(1) taking the positive electrode part solution as feed liquid after the high-sulfur bauxite leaching tail liquid passes through 25V direct current for 6 hours,
(2) preparing the precipitant into a solution of 5g/L, dripping the solution into the feed liquid, stirring to form precipitate,
(3) heating the precipitation solution for 1 hour, and stirring in due time during heating;
(4) and cooling and filtering the heated solution, washing the precipitate with water twice to obtain sulfur-containing filter residues, and reserving the original filtrate for measuring sulfur-containing ions in the filtrate.
And (4) measuring the original filtrate in the step (4) by using an iodine-sodium thiosulfate titration method, and calculating the concentration of sulfur-containing ions (S2-, SO 3-and S2O32-) in the high-sulfur bauxite leaching tail liquid by using the difference of the reaction conditions of the three ions and iodine. And (4) comparing the concentration of the sulfur-containing ions in the feed liquid (the calculation method is the same as that of the original filtrate), and calculating to obtain the removal rate of the sulfur-containing ions.
In this example, a plurality of precipitants are used together to remove sulfur ions in the sodium aluminate solution after leaching of the high-sulfur bauxite, and the removal rate of the sulfur ions by the method is shown in table 4.
TABLE 4
As can be seen from Table 4, in order to achieve a high removal rate of sulfur-containing ions from the leachate, a plurality of precipitants can be mixed for use, and the method utilizes the combined action of the plurality of precipitants, has a small dosage of the precipitants and a good removal effect on the sulfur-containing ions, and is a high-efficiency and economical desulfurization method.
While the present invention has been described in detail with reference to the specific embodiments thereof, the present invention is not limited to the embodiments described above, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (6)
1. A precipitation desulfurization method for a high-sulfur bauxite leaching solution is characterized by comprising the following steps:
(1) putting the high-sulfur bauxite leaching solution into a U-shaped container, respectively inserting graphite electrodes into two ends of the U-shaped container, introducing 10-25V direct current for 5-6h, and taking out the feed liquid at the positive electrode end;
(2) dissolving a precipitator in water according to the proportion of 5-50g/L, dropwise adding the precipitator solution into the feed liquid, and stirring to fully precipitate;
(3) heating and boiling the mixed solution obtained in the step (2) for 0.5-1 hour, and stirring during heating;
(4) cooling and filtering the heated solution, washing the precipitate with water to obtain sulfur-containing filter residue, and reserving the primary filtrate;
the precipitator is one of calcium sulfate, calcium oxide, calcium fluoride, tricalcium phosphate, calcium acetate, calcium chloride, calcium hydroxide, magnesium carbonate, magnesium oxide, zinc sulfate and aluminum chloride.
2. The method for precipitation desulfurization of the leaching solution of the high-sulfur bauxite according to claim 1, characterized in that: the direct current in the step (1) is 10-25V.
3. The method for precipitation desulfurization of the leaching solution of the high-sulfur bauxite according to claim 1, characterized in that: the anode end feed liquid taken out in the step (1) is 30-35% of the total volume of the high-sulfur bauxite leaching liquid.
4. The method for precipitation desulfurization of the leaching solution of the high-sulfur bauxite according to claim 1, characterized in that: the precipitator used in the step (2) is one or more of calcium sulfate, calcium oxide, calcium fluoride, tricalcium phosphate, calcium acetate, calcium chloride, calcium hydroxide, magnesium carbonate, magnesium oxide, zinc sulfate and aluminum chloride which are mixed according to any proportion.
5. The method for precipitation desulfurization of the leaching solution of the high-sulfur bauxite according to claim 1, characterized in that: in the step (2), the volume ratio of the precipitant solution to the feed liquid is 1: 1.
6. The method for precipitation desulfurization of the leaching solution of the high-sulfur bauxite according to claim 1, characterized in that: and (4) washing the precipitate for not less than 2 times.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1323741A (en) * | 2000-05-12 | 2001-11-28 | 张至德 | Technological process of preparing aluminium hydroxide from sodium hydroxide fused bauxite |
| CN101302020A (en) * | 2008-06-26 | 2008-11-12 | 贵州大学 | High-sulphur alumyte desulfuration method |
| CN102286661A (en) * | 2011-08-25 | 2011-12-21 | 云南锡业集团（控股）有限责任公司 | Method for direct electrolysis of laterite nickel ore by sulfuric acid leaching |
| WO2012145797A1 (en) * | 2011-04-29 | 2012-11-01 | Commonwealth Scientific And Industrial Research Organisation | Recovery of soda from bauxite residue |
| CN103173608A (en) * | 2013-03-25 | 2013-06-26 | 中国科学院过程工程研究所 | Electrolysis- desulphurization method of high-sulfur monohydrallite |
| CN103820634A (en) * | 2014-02-17 | 2014-05-28 | 中国科学院过程工程研究所 | High-sulfur bauxite electrolytic desulfurization method under ultrasonic enhanced alkaline system |
| CN108545764A (en) * | 2018-07-03 | 2018-09-18 | 贵州大学 | A kind of method of ardealite and high-sulfur bauxite electric cable material with low smoke and halogen free coproduction acid |
-
2021
- 2021-10-22 CN CN202111230466.7A patent/CN113912095B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1323741A (en) * | 2000-05-12 | 2001-11-28 | 张至德 | Technological process of preparing aluminium hydroxide from sodium hydroxide fused bauxite |
| CN101302020A (en) * | 2008-06-26 | 2008-11-12 | 贵州大学 | High-sulphur alumyte desulfuration method |
| WO2012145797A1 (en) * | 2011-04-29 | 2012-11-01 | Commonwealth Scientific And Industrial Research Organisation | Recovery of soda from bauxite residue |
| CN102286661A (en) * | 2011-08-25 | 2011-12-21 | 云南锡业集团（控股）有限责任公司 | Method for direct electrolysis of laterite nickel ore by sulfuric acid leaching |
| CN103173608A (en) * | 2013-03-25 | 2013-06-26 | 中国科学院过程工程研究所 | Electrolysis- desulphurization method of high-sulfur monohydrallite |
| CN103820634A (en) * | 2014-02-17 | 2014-05-28 | 中国科学院过程工程研究所 | High-sulfur bauxite electrolytic desulfurization method under ultrasonic enhanced alkaline system |
| CN108545764A (en) * | 2018-07-03 | 2018-09-18 | 贵州大学 | A kind of method of ardealite and high-sulfur bauxite electric cable material with low smoke and halogen free coproduction acid |
Non-Patent Citations (1)
| Title |
|---|
| 郑立聪;谢克强;刘战伟;马文会;: "一水硬铝石型高硫铝土矿脱硫研究进展" * |
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