CN116213130A - Iron extraction and sulfur reduction process for high-sulfur iron ore - Google Patents
Iron extraction and sulfur reduction process for high-sulfur iron ore Download PDFInfo
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- CN116213130A CN116213130A CN202310157481.6A CN202310157481A CN116213130A CN 116213130 A CN116213130 A CN 116213130A CN 202310157481 A CN202310157481 A CN 202310157481A CN 116213130 A CN116213130 A CN 116213130A
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 191
- 229910052717 sulfur Inorganic materials 0.000 title claims abstract description 118
- 239000011593 sulfur Substances 0.000 title claims abstract description 118
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 title claims abstract description 97
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 95
- 238000011946 reduction process Methods 0.000 title claims abstract description 14
- 238000000605 extraction Methods 0.000 title claims abstract description 11
- 239000012141 concentrate Substances 0.000 claims abstract description 56
- 238000003756 stirring Methods 0.000 claims abstract description 42
- 238000005188 flotation Methods 0.000 claims abstract description 30
- 238000007667 floating Methods 0.000 claims abstract description 28
- 229910000365 copper sulfate Inorganic materials 0.000 claims abstract description 16
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 claims abstract description 16
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 claims abstract description 16
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims abstract description 16
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims abstract description 16
- 239000006260 foam Substances 0.000 claims abstract description 14
- 239000004088 foaming agent Substances 0.000 claims abstract description 13
- 238000007885 magnetic separation Methods 0.000 claims abstract description 11
- 230000003213 activating effect Effects 0.000 claims abstract description 9
- 238000005273 aeration Methods 0.000 claims abstract description 9
- 238000002156 mixing Methods 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 25
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 24
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 claims description 24
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 20
- 230000008569 process Effects 0.000 claims description 12
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 10
- 230000004913 activation Effects 0.000 claims description 8
- -1 sodium phenyl disulfide propane sulfonate Chemical compound 0.000 claims description 6
- 238000004513 sizing Methods 0.000 claims description 4
- 229910052952 pyrrhotite Inorganic materials 0.000 abstract description 15
- 229910052683 pyrite Inorganic materials 0.000 abstract description 13
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 abstract description 13
- 239000011028 pyrite Substances 0.000 abstract description 13
- 239000003795 chemical substances by application Substances 0.000 abstract description 11
- 238000003912 environmental pollution Methods 0.000 abstract description 3
- 230000002209 hydrophobic effect Effects 0.000 abstract description 2
- 238000006477 desulfuration reaction Methods 0.000 description 12
- 230000023556 desulfurization Effects 0.000 description 12
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 6
- 239000003245 coal Substances 0.000 description 6
- 230000003009 desulfurizing effect Effects 0.000 description 5
- JTEQZWNDYJRHSC-UHFFFAOYSA-N C1(=CC=CC=C1)OS(=S)(=S)CCC.[Na] Chemical compound C1(=CC=CC=C1)OS(=S)(=S)CCC.[Na] JTEQZWNDYJRHSC-UHFFFAOYSA-N 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- YQCIWBXEVYWRCW-UHFFFAOYSA-N methane;sulfane Chemical compound C.S YQCIWBXEVYWRCW-UHFFFAOYSA-N 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 238000006722 reduction reaction Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 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
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000012190 activator Substances 0.000 description 1
- 229910052925 anhydrite Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000010494 dissociation reaction Methods 0.000 description 1
- 230000005593 dissociations Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- UAGGVDVXSRGPRP-UHFFFAOYSA-M n,n-diethylcarbamothioate Chemical compound CCN(CC)C([O-])=S UAGGVDVXSRGPRP-UHFFFAOYSA-M 0.000 description 1
- 231100000957 no side effect Toxicity 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- YIBBMDDEXKBIAM-UHFFFAOYSA-M potassium;pentoxymethanedithioate Chemical compound [K+].CCCCCOC([S-])=S YIBBMDDEXKBIAM-UHFFFAOYSA-M 0.000 description 1
- 238000004537 pulping Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000002000 scavenging effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 238000010301 surface-oxidation reaction Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/02—Froth-flotation processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/001—Flotation agents
- B03D1/018—Mixtures of inorganic and organic compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/14—Flotation machines
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D2201/00—Specified effects produced by the flotation agents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D2201/00—Specified effects produced by the flotation agents
- B03D2201/02—Collectors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D2201/00—Specified effects produced by the flotation agents
- B03D2201/04—Frothers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D2203/00—Specified materials treated by the flotation agents; specified applications
- B03D2203/02—Ores
-
- 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
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- Life Sciences & Earth Sciences (AREA)
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- Biotechnology (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses an iron extraction and sulfur reduction process for high-sulfur iron ores, and relates to the technical field of iron ore dressing. The invention at least comprises the following steps: s1: sodium hexametaphosphate and copper sulfate are added into the weak magnetic separation iron ore concentrate pulp; s2: stirring and mixing the mixed materials, and then stirring and activating to prepare flotation pulp; s3: adding a floating sulfur collector into the flotation pulp, and stirring for 4min; s4: adding a foaming agent
Stirring for 1min at 40g/t, and carrying out roughing by a flotation machine after aeration for 5min to obtain foam product sulfur concentrate and desulfurized rough iron concentrate; s5: introducing the desulfurized rough iron concentrate into a treatment tank, adding the floating sulfur collector into the treatment tank again, and stirring for 4min. According to the invention, pyrite in the iron concentrate is activated through the combination of the activating agents, the passivated surface oxide film is removed, a fresh surface is formed, and then the collecting agent is selectively adsorbed on the surface of pyrrhotite, so that the pyrrhotite is hydrophobic and floats upwards, the purpose of reducing sulfur is achieved, high-requirement equipment is not needed, and environmental pollution is reduced.
Description
Technical Field
The invention relates to the technical field of iron ore dressing, in particular to an iron extraction and sulfur reduction process for high-sulfur iron ores.
Background
It is known that exceeding sulfur content in iron ore concentrate can seriously affect subsequent smelting procedures and quality. According to statistics, the sulfur content in the iron ore concentrate is increased by 0.1%, and the blast furnace smelting coke ratio is increased by 5%.
Referring to the Chinese patent document with the patent number of CN102974469A, a floating sulfur collector and a method for reducing sulfur by floatation of iron concentrate are disclosed, wherein the floating sulfur collector consists of potassium amyl xanthate and sodium N, N-diethyl thiocarbamate in a mass ratio of 1-3:1, the method for reducing sulfur by floatation of the iron concentrate by using the floating sulfur collector is characterized in that a regulator is added into ore pulp of the iron concentrate with weak magnetic separation to adjust the pH value, and then the floating sulfur collector is added for one-time roughing and one-time concentration, so that pyrrhotite with better dissociation can be obtained by roughing, pyrrhotite can be further obtained by concentration, the sulfur content in the iron concentrate obtained after concentration can reach below 0.1 percent, and the iron loss is less than 5 percent;
the method for reducing sulfur in the iron ore concentrate by floatation is simple in steps, high in operability and capable of reducing sulfur to 0.1% under the condition that the sulfur content in the ore is up to 1%, can meet the raw material requirements of various large steel companies, and improves the overall quality of steel.
Referring to the Chinese patent document with the patent number of CN115007327A, a beneficiation method of high-carbon refractory pyrite is disclosed, and comprises the following steps: grinding the ore to obtain raw ore pulp, and then adding a carbonaceous collecting agent and a foaming agent to perform floatable operations such as carbon sulfur and the like to obtain floatable ore concentrate pulp such as carbon sulfur and the like and floatable tailings such as carbon sulfur and the like; separating carbon and sulfur from the ore pulp of the floatable concentrate such as carbon and sulfur by a gravity separation method to obtain carbonaceous and first sulfur concentrate; mixing floatable tailings such as carbon and sulfur with a pyrite activator, adding a pyrite collector and a foaming agent for sulfur asynchronous flotation to obtain sulfur roughing concentrate and sulfur roughing tailings; regrinding the sulfur roughing concentrate, and adding gangue inhibitors for concentration to obtain second sulfur concentrate; scavenging the sulfur roughing tailings;
the beneficiation method for the high-carbon refractory pyrite provided by the application effectively realizes the efficient recycling of the high-carbon refractory pyrite resources, has the characteristics of simple and reasonable flow, easiness in management operation, good beneficiation index and the like, and is beneficial to popularization and application.
Referring to the Chinese patent document with the patent number of CN115537549A, the application relates to the field of solid pollutant treatment, in particular to a method for solid desulfurization treatment of a desulfurizing agent and high-sulfur iron ore, which is disclosed as a method for solid desulfurization treatment of the desulfurizing agent and the high-sulfur iron ore; the desulfurizing agent comprises desulfurized ash and coal, and the mass ratio of the desulfurized ash to the coal is 1.5-2.5:1; the method comprises the following steps: mixing high-sulfur iron ore and the desulfurizing agent in the first aspect, and roasting to enable the desulfurization of the high-sulfur iron ore and the iron reduction process to be carried out simultaneously, so as to obtain an iron-containing mixture; carrying out magnetic separation on the iron-containing mixture to obtain metallic iron; the method has the advantages that the desulfurization ash and coal are matched, the CaSO4 of the desulfurization ash is used as an oxygen carrier to carry out oxidation desulfurization on sulfur in a medium-low valence state in high-sulfur iron ore, meanwhile, the coal can carry out reduction reaction with iron ore phases after desulfurization is completed, and the proportion of the desulfurization ash and the coal is controlled, so that sufficient coal participates in the reduction reaction on the premise that desulfurization is sufficient, and synchronous desulfurization and reduction of the high-sulfur iron ore can be completed only through a desulfurizing agent.
However, the above patent has problems in that when the content of ca2+ and mg2+ in the flotation water is too high, ca2+ and mg2+ are adsorbed on the surface of the iron ore, so that the surface is hydrophilic, surface oxidation is more likely to occur, floatability is deteriorated, a flotation effect is reduced, strong acid such as sulfuric acid, hydrochloric acid and the like is required for activation, high requirements are put on equipment, and environmental pollution is also likely to be caused.
Disclosure of Invention
The invention aims to provide an iron extraction and sulfur reduction process for high-sulfur iron ores, which aims to solve the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions: the iron-extracting and sulfur-reducing process for high-sulfur iron ore at least comprises the following steps:
s1: sodium hexametaphosphate and copper sulfate are added into the weak magnetic separation iron ore concentrate pulp;
s2: stirring and mixing the mixed materials, and then stirring and activating to prepare flotation pulp;
s3: adding a floating sulfur collector into the flotation pulp, and stirring for 4min;
s4: adding a foaming agent
Stirring for 1min at 40g/t, and roughing by a flotation machine after aeration for 5min to float out the main sulfur phase, and feeding the main sulfur phase into a foam product to roughe to obtain foam product sulfur concentrate and desulfurized rough iron concentrate;
s5: introducing the desulfurized rough iron concentrate into a treatment tank, adding a floating sulfur collector into the treatment tank again, and stirring for 4min;
s6: adding a foaming agent
And (3) carrying out concentration on 20g/t of oil by adopting a flotation machine after aeration for 3min to finally obtain iron concentrate and sulfur concentrate.
Preferably, sodium hexametaphosphate and copper sulfate are added into the ore pulp of the low-intensity magnetic separation iron concentrate, wherein the addition amount of the sodium hexametaphosphate is 60-100 g/t, and the addition amount of the copper sulfate is 30-50 g/t.
Preferably, the stirring and activating after the stirring and sizing of the mixed materials at least comprises the following steps:
stirring the ore pulp, sodium hexametaphosphate and copper sulfate for 3-5 min to obtain pulp;
adding 200-300 g/t sodium carbonate into the size mixing;
after adding sodium carbonate, stirring is carried out for 3min to complete activation.
Preferably, the floating sulfur collector at least comprises sodium phenyl disulfide propane sulfonate, triethylamine and ethylene glycol, and the mass ratio of the sodium phenyl disulfide propane sulfonate to the triethylamine to the ethylene glycol is 3:1:1.
Preferably, the rougher flotation machine linear velocity and the beneficiated flotation machine linear velocity are both 7.2m/s.
Preferably, the addition amount of the floating sulfur collector in the step S3 is 80-120 g/t.
Preferably, the addition amount of the floating sulfur collector in the step S5 is 60-80 g/t.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, pyrite in the iron concentrate is activated through the combination of the activating agents, the passivated surface oxide film is removed, a fresh surface is formed, and then the collecting agent is selectively adsorbed on the surface of pyrrhotite, so that the pyrrhotite is hydrophobic and floats upwards, the purpose of reducing sulfur is achieved, high-requirement equipment is not needed, and environmental pollution is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of the whole process of the present invention.
Description of the embodiments
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
Examples
Referring to fig. 1, a process for extracting iron and reducing sulfur from high-sulfur iron ore at least comprises the following steps:
s1: sodium hexametaphosphate and copper sulfate are added into the weak magnetic separation iron ore concentrate pulp;
s2: stirring and mixing the mixed materials, and then stirring and activating to prepare flotation pulp;
s3: adding a floating sulfur collector into the flotation pulp, and stirring for 4min;
s4: adding a foaming agent
Stirring for 1min at 40g/t, and roughing by a flotation machine after aeration for 5min to float out the main sulfur phase, and feeding the main sulfur phase into a foam product to roughe to obtain foam product sulfur concentrate and desulfurized rough iron concentrate;
s5: introducing the desulfurized rough iron concentrate into a treatment tank, adding a floating sulfur collector into the treatment tank again, and stirring for 4min;
s6: adding a foaming agent
The oil is 20g/t, and is selected by a flotation machine after aeration for 3min, so that iron concentrate and sulfur concentrate are finally obtained;
in this embodiment, the iron fines are iron fines having a sulfur content of 0.065% and a foam product having a sulfur content of 37.6%, wherein the foam product having a sulfur content of 37.6% may be sold as a sulfur concentrate.
Sodium hexametaphosphate and copper sulfate are added into the weak magnetic separation iron ore concentrate pulp, wherein the addition amount of the sodium hexametaphosphate is 60-100 g/t, and the addition amount of the copper sulfate is 30-50 g/t.
Stirring and activating the mixed materials after stirring and sizing, wherein the method at least comprises the following steps:
stirring the ore pulp, sodium hexametaphosphate and copper sulfate for 3-5 min to obtain pulp;
adding 200-300 g/t sodium carbonate into the size mixing;
after adding sodium carbonate, stirring is carried out for 3min to complete activation.
The floating sulfur collector at least comprises sodium phenyl dithiopropane sulfonate, triethylamine and ethylene glycol, and the mass ratio of the sodium phenyl dithiopropane sulfonate to the triethylamine to the ethylene glycol is 3:1:1.
The rougher flotation line speed and the cleaner flotation line speed were 7.2m/s.
The addition amount of the floating sulfur collector in the S3 is 80-120 g/t.
And S5, the addition amount of the floating sulfur collector is 60-80 g/t.
Sodium hexametaphosphate, copper sulfate and sodium carbonate are added into pyrrhotite to be used as combined agents to activate pyrrhotite, so that oxide films on the surface of high-sulfur iron ore can be removed, the floatability of the pyrite is ensured, the pH value of ore pulp is between 5.0 and 6.0, under the acidic condition, the sodium carbonate can be automatically decomposed to form CO2 microbubbles to adhere to the mud pyrrhotite, and therefore, compared with the traditional method, the floatability of micro-fine particles can be greatly improved, the recovery rate of the pyrrhotite is improved, and the sulfur content of iron concentrate is reduced;
after activation, the fresh surface of the pyrrhotite is easy to be selectively adsorbed by the floating sulfur collector, so that the problem of poor floatability of the pyrrhotite by the traditional method is solved;
the process has the advantages of high activation efficiency of the combined medicament, no side effect, simple process flow and easy realization, when the sulfur content in the ore feeding is less than 1.3%, the sulfur content in the iron concentrate can be reduced to about 0.07%, when the sulfur content in the ore feeding is up to 2.2%, the sulfur content in the iron concentrate can be reduced to below 0.15%, and the iron recovery rate is more than 95%.
Examples
The embodiment is used for further providing a mineral sample from a foreign import of certain iron ore on the premise of the first embodiment;
the mineral samples are from foreign importation of certain iron ores, and the chemical multi-element analysis and chemical phase results of sulfur are shown in Table 1:
TABLE 1 chemical multi-element analysis results (%)
| Component (A) | TFe | FeO | Fe 2 O 3 | Cu | Pb | Zn | Co | SiO 2 |
| Content of | 58.13 | 27.22 | 52.86 | 0.20 | 0.19 | 0.0099 | 7.82 | |
| Component (A) | TiO 2 | Al 2 O 3 | CaO | MgO | MnO | Na 2 O | K 2 O | P |
| Content of | 0.064 | 1.23 | 2.43 | 2.48 | 0.057 | 0.20 | 0.23 | 0.084 |
| Component (A) | As | S | CO 2 | Loss of burning | TFe/FeO | |||
| Content of | 0.0387 | 2.20 | 0.84 | 3.73 | 2.14 |
Table 2 chemical phase analysis results (%)
| Sulfur phase | Sulfur in pyrrhotite | Sulfur in pyrite | Sulfur in other phases | Combination meter |
| Content of | 1.55 | 0.43 | 0.22 | 2.20 |
| Distribution ratio | 70.45 | 20.45 | 10 | 100.00 |
The iron ore has high sulfur content, sulfur elements are mainly distributed in pyrrhotite and pyrite, and the iron ore concentrate flotation sulfur reduction process in the first embodiment is adopted for desulfurization treatment, and specifically comprises the following steps:
adding 100g/t of sodium hexametaphosphate and 50g/t of copper sulfate into the weak magnetic separation iron ore concentrate pulp with the ore grinding fineness of-0.075 mm accounting for 82%, stirring and pulping for 5min, adding 300g/t of sodium carbonate, and stirring for 3min to complete activation;
adding a floating sulfur collector consisting of sodium phenyl disulfide propane sulfonate, triethylamine and ethylene glycol in a mass ratio of 3:1:1 into the floating ore pulp, wherein the addition amount is 100g/t, and stirring for 4min; adding a foaming agent
40g/t of oil, stirring for 1min, carrying out air inflation for roughing, wherein the roughing time is 5min, the pyrite is floated out and enters a foam product, and the roughing is carried out to obtain foam product sulfur concentrate and desulphurized rough iron concentrate, wherein in the step, the linear speed of a flotation machine is 7m/s;
adding a floating sulfur collector consisting of sodium phenyl dithiopropane sulfonate, ethylenediamine and propylene glycol into the desulfurized rough iron concentrate product in the roughing trough again, stirring for 4min, and adding a foaming agent
The oil is 20g/t, aeration is carried out for concentration, the concentration time is 3min, the linear speed of a flotation machine is 7m/s, the sulfur content in the obtained iron concentrate powder is 0.14%, the quality standard is reached, the sulfur content in the foam product is 39.5%, and the iron recovery rate is 95.3%.
Embodiment III:
the embodiment is used for further providing a mineral sample from some iron ore of Shaanxi on the premise of the first embodiment;
the ore sample comes from certain iron ore of Shaanxi, the iron content of the iron ore is 49.2 percent, the sulfur content is 1.1 percent, and sulfur elements are mainly distributed in pyrrhotite and pyrite, and the iron concentrate flotation sulfur reduction process in the first embodiment is adopted for desulfurization treatment, and specifically comprises the following steps:
adding 80g/t of sodium hexametaphosphate and 40g/t of copper sulfate into the ore pulp of the low-intensity magnetic separation iron ore concentrate with the ore concentration of 35%, stirring and sizing for 5min, adding 280g/t of sodium carbonate, and stirring for 3min to finish activation;
adding a floating sulfur collector consisting of sodium phenyl disulfide propane sulfonate, triethylamine and ethylene glycol in a mass ratio of 3:1:1 into the floating ore pulp, wherein the adding amount is 80g/t, and stirring for 4min; adding a foaming agent
And (3) stirring 30g/t of oil for 1min, carrying out air inflation for roughing, wherein the roughing time is 5min, and the pyrite is floated out and enters a foam product to obtain foam product sulfur concentrate and desulfurized rough iron concentrate through roughing. In the step, the linear speed of the flotation machine is 7m/s;
adding a floating sulfur collector consisting of sodium phenyl dithiopropane sulfonate, ethylenediamine and propylene glycol into the desulfurized rough iron concentrate product in the roughing trough again, stirring for 4min, and adding a foaming agent
The oil is 20g/t, aeration is carried out for concentration, the concentration time is 3min, the linear speed of a flotation machine is 7m/s, the sulfur content in the obtained iron concentrate powder is 0.07%, the quality standard is reached, the sulfur content in the foam product is 37.2%, and the iron recovery rate is 96.2%.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (7)
1. A process for extracting iron and reducing sulfur from high-sulfur iron ore is characterized by comprising the following steps: at least comprises the following steps:
s1: sodium hexametaphosphate and copper sulfate are added into the weak magnetic separation iron ore concentrate pulp;
s2: stirring and mixing the mixed materials, and then stirring and activating to prepare flotation pulp;
s3: adding a floating sulfur collector into the flotation pulp, and stirring for 4min;
s4: adding a foaming agent
Stirring for 1min at 40g/t, and carrying out roughing by a flotation machine after aeration for 5min to obtain foam product sulfur concentrate and desulfurized rough iron concentrate;
s5: introducing the desulfurized rough iron concentrate into a treatment tank, adding a floating sulfur collector into the treatment tank again, and stirring for 4min;
s6: adding a foaming agent
And (3) carrying out concentration on 20g/t of oil by adopting a flotation machine after aeration for 3min to finally obtain iron concentrate and sulfur concentrate.
2. The iron and sulfur extraction and reduction process for high-sulfur iron ores according to claim 1, wherein the process comprises the following steps of: sodium hexametaphosphate and copper sulfate are added into the weak magnetic separation iron ore concentrate pulp, wherein the addition amount of the sodium hexametaphosphate is 60-100 g/t, and the addition amount of the copper sulfate is 30-50 g/t.
3. The iron and sulfur extraction and reduction process for high-sulfur iron ores according to claim 1, wherein the process comprises the following steps of: the step of stirring and activating the mixed materials after stirring and sizing at least comprises the following steps:
stirring the ore pulp, sodium hexametaphosphate and copper sulfate for 3-5 min to obtain pulp;
adding 200-300 g/t sodium carbonate into the size mixing;
after adding sodium carbonate, stirring is carried out for 3min to complete activation.
4. The iron and sulfur extraction and reduction process for high-sulfur iron ores according to claim 1, wherein the process comprises the following steps of: the floating sulfur collector at least comprises sodium phenyl disulfide propane sulfonate, triethylamine and ethylene glycol, wherein the mass ratio of the sodium phenyl disulfide propane sulfonate to the triethylamine to the ethylene glycol is 3:1:1.
5. The iron and sulfur extraction and reduction process for high-sulfur iron ores according to claim 1, wherein the process comprises the following steps of: the rougher flotation machine linear velocity and the beneficiated flotation machine linear velocity were 7.2m/s.
6. The iron and sulfur extraction and reduction process for high-sulfur iron ores according to claim 1, wherein the process comprises the following steps of: the addition amount of the floating sulfur collector in the step S3 is 80-120 g/t.
7. The iron and sulfur extraction and reduction process for high-sulfur iron ores according to claim 1, wherein the process comprises the following steps of: the addition amount of the floating sulfur collector in the step S5 is 60-80 g/t.
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