WO2014208504A1 - 低硫黄含有鉄鉱石の製造方法 - Google Patents
低硫黄含有鉄鉱石の製造方法 Download PDFInfo
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- WO2014208504A1 WO2014208504A1 PCT/JP2014/066581 JP2014066581W WO2014208504A1 WO 2014208504 A1 WO2014208504 A1 WO 2014208504A1 JP 2014066581 W JP2014066581 W JP 2014066581W WO 2014208504 A1 WO2014208504 A1 WO 2014208504A1
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- iron ore
- sulfur
- flotation
- xanthate
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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
- B03D1/001—Flotation agents
- B03D1/004—Organic compounds
- B03D1/012—Organic compounds containing sulfur
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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
- B03D1/001—Flotation agents
- B03D1/004—Organic compounds
- B03D1/01—Organic compounds containing nitrogen
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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
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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
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
- B03B5/28—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation
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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
- B03D2201/00—Specified effects produced by the flotation agents
- B03D2201/02—Collectors
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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
- B03D2203/00—Specified materials treated by the flotation agents; specified applications
- B03D2203/02—Ores
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- 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
- C22B1/11—Removing sulfur, phosphorus or arsenic other than by roasting
Definitions
- the present invention relates to a method for producing iron ore having a sulfur content reduced to 0.08% or less by flotation of iron ore containing sulfur.
- Iron ore is abundant and high-grade iron ore with few impurities such as sulfur has been used.
- the demand for iron ore is increasing and it is becoming difficult to obtain high-grade iron ore, and it is necessary to refine and use low-grade iron ore with many impurities such as sulfur.
- Flotation is known as a technique for reducing impurities contained in low-grade iron ore.
- Flotation is a beneficiation method in which bubbles are supplied to an aqueous suspension containing fine iron ore, and only specific types of particles are attached to the bubbles to selectively float and separate.
- Non-Patent Document 1 discloses a technique for performing flotation of pyrrhotite (substance represented by FeSx) containing 36.73% sulfur using xanthate as a collecting agent.
- Non-Patent Document 2 discloses a technology for flotation of pyrrhotite containing sulfur in a range of 39.0 to 42.5% using xanthate or RADA (Rosin Amine D Acetate) as a collection agent. Has been.
- Patent Document 1 also uses a combination of xanthate reacted with a carbohydrate and an amine to make the pH of the aqueous solution around 8, and to improve the iron concentration in taconite, which is a poor mineral, from about 30% to about 60%.
- a flotation technique is disclosed.
- Some low-grade iron ores contain a small amount of sulfur in the range of more than 0.08% and 2% or less. If a technology capable of reducing the amount of small amount of sulfur contained in such low-grade iron ore to 0.08% or less can be provided, it is considered useful as an alternative technology for iron ore having an amount of sulfur of 0.08% or less originally.
- Non-Patent Document 1 and Non-Patent Document 2 described above as described above, a technique for performing flotation of pyrrhotite containing a large amount of sulfur in the range of 36.73 to 42.5% is studied. No attempt has been made to produce iron ore with a sulfur content reduced to 0.08% or less by flotation of iron ore containing a small amount of sulfur over 0.08% and 2% or less. . Moreover, in the said nonpatent literature 1 and the nonpatent literature 2, in order to reduce sulfur content to 0.08% or less, it is necessary to use a lot of collection agents, and it becomes high cost.
- the component composition of iron ore is not disclosed in Patent Document 1, and the amount of sulfur contained in the iron ore is unknown, and this document includes a combination of xanthate reacted with a carbohydrate and an amine. Only the method of refining the iron ore used is described.
- the present invention has been made paying attention to the above-described circumstances, and the object thereof is iron ore containing sulfur in a range of more than 0.08% and not more than 2% (that is, 0.08% of sulfur). It is an object of the present invention to provide a method capable of producing iron ore having a sulfur content reduced to 0.08% or less at low cost by flotation of the iron ore containing pyrrhotite containing in the range of 2% or less.
- the method for producing a low sulfur content iron ore according to the present invention that has solved the above-mentioned problems is the flotation of iron ore containing more than 0.08% and 2% or less of sulfur, and the sulfur content is 0.08.
- % Of iron ore reduced to less than or equal to (1) As a collecting agent, a xanthate compound and a salt of an amine compound are used, (2) A xanthate compound is used as a collector, and a substance that releases sulfur ions in water is used as an activator, or (3) a xanthate compound and a salt of an amine compound are used as a collector. The main point is that a substance that releases sulfur ions in water is used as an activator.
- the xanthate compound and the salt of the amine compound may be added simultaneously.
- the substance that releases sulfur ions in water for example, at least one selected from the group consisting of sodium sulfide, sodium hydrosulfide, and sodium thiosulfate can be used.
- the flotation is preferably performed in a pH range of 4 or more and less than 7.
- a xanthate compound is used as a collecting agent at the time of flotation, and further, Since a salt of an amine compound is used as the agent and / or a substance that releases sulfur ions in water is used as the activator, sulfur is efficiently removed. As a result, iron ore having a sulfur content reduced to 0.08% or less can be produced at low cost.
- the amount of xanthate compound used can be reduced as compared with the prior art, it is possible to reduce the processing load of the waste liquid generated by flotation.
- FIG. 1 is a drawing-substituting photograph in which a cross section of iron ore is photographed.
- iron ore containing more than 0.08% and less than 2% sulfur ie, iron ore containing pyrrhotite containing more than 0.08% and less than 2% sulfur.
- S sulfur
- a salt of an amine compound is used as a collector and / or a substance that releases sulfur ions in water as an activator.
- the sulfur removal rate was further increased, and it was found that the amount of sulfur contained in iron ore could be reduced to 0.08% or less, and the present invention was completed.
- the amount of sulfur contained in iron ore is included in iron ore when the entire iron ore containing sulfur is used as a standard (100%).
- the percentage of sulfur is expressed as a percentage (%).
- the percentage (%) shows the percentage (mass%) on the basis of mass in detail.
- the percentage based on mass is the same as the percentage based on weight (% by weight).
- pyrrhotite is easy to oxidize, and if it is oxidized, it becomes difficult to perform flotation with a collector; a xanthate compound is used as a collector during flotation and sulfur ions in water are used as an activator. If a substance that releases selenium is used, oxidation of pyrrhotite contained in iron ore can be prevented by the action of the activator, so that flotation can be reliably performed on pyrrhotite, and the amount of sulfur contained in iron ore is reduced to 0.08% or less It became clear that it could be reduced.
- FIG. 1 shows a drawing-substituting photograph taken by embedding iron ore in a resin and polishing the cross section.
- a xanthate compound that effectively acts on the flotation of FeS and FeSx and an amine compound salt that acts on the flotation of SiO 2 are used in combination.
- SiO 2 can be subjected to flotation by using a salt of an amine compound together.
- the S component coexisting with SiO 2 is also flotated, so that the amount of S contained in the iron ore is 0.08. % Or less.
- xanthate compound means a dithiocarbamate in addition to xanthate.
- Xanthate refers to a xanthate having the chemical structure —OC ( ⁇ S) —S—.
- An example of xanthate is R—OC ( ⁇ S) —SM— (wherein R represents an alkyl group having 1 to 20 carbon atoms, M represents an alkali metal such as Na or K, NH 4 or the like).
- R represents an alkyl group having 1 to 20 carbon atoms
- M represents an alkali metal such as Na or K, NH 4 or the like.
- xanthate known ones can be used, for example, potassium amyl xanthate, potassium ethyl xanthate, sodium ethyl xanthate, sodium isopropyl xanthate, potassium isobutyl xanthate, sodium isobutyl xanthate, etc. it can.
- These xanthates may use two or more kinds selected arbitrarily.
- dithiocarbamate a commercially available product (for example, can be purchased from Tokyo Chemical Industry Co., Ltd.) can be used.
- the xanthate compound is preferably added so as to be 10 to 250 g per ton of iron ore at the time of flotation.
- the amount of the xanthate compound added is more preferably 50 to 225 g per ton of iron ore. If the amount of the xanthate compound added is less than 10 g per ton of iron ore, the amount of the xanthate compound is too small to sufficiently react with FeSx (pyramite) contained in the iron ore, and the iron ore There is a possibility that the amount of sulfur contained cannot be sufficiently reduced. On the other hand, if the xanthate compound is added in an amount exceeding 250 g per ton of iron ore, the cost may increase excessively.
- an amine compound salt for example, an amine compound acetate, an amine compound hydrochloride, an amine compound sulfate, an amine compound nitrate, or the like can be used.
- an amine compound acetate is preferably used. be able to.
- an amine having an alkyl group can be used as the amine compound.
- the number of carbon atoms of the alkyl group is not particularly limited.
- the number of carbon atoms may be 6 to 18, and more preferably 8 to 18.
- the amine may be any of primary amine, secondary amine, tertiary amine, and quaternary amine.
- the salt of the amine compound is preferably a dodecylamine salt, more preferably dodecylamine acetate.
- the amine compound salt is preferably added in an amount of 1 to 100 g per ton of iron ore during flotation.
- the amount of the amine compound salt added is more preferably 5 to 20 g per ton of iron ore.
- the amount of the amine compound salt added is less than 1 g per ton of iron ore, the amount of the amine compound salt is too small to sufficiently separate and remove SiO 2 contained in the iron ore. There is a possibility that the amount of sulfur contained cannot be sufficiently reduced.
- the salt of the amine compound is added in an amount exceeding 100 g per ton of iron ore, the amount of the amine compound becomes excessive, and the amount of sulfur contained in the iron ore is sufficiently increased when performing flotation. May not be reduced.
- the xanthate compound and the salt of the amine compound may be added separately or at the same time during the flotation, but it is preferable to add them simultaneously.
- iron ore containing more than 0.08% and 2% or less of sulfur is put into a container containing water.
- the iron ore is preferably pulverized in advance so that the average particle size is about 10 to 250 ⁇ m.
- the pulp concentration is preferably 10% or more.
- the pulp concentration is preferably 70% or less, more preferably 60% or less.
- the pH of the aqueous solution in the container charged with iron ore is an important condition for determining the charge on the surface of the iron ore.
- a pH adjusting agent such as an aqueous NaOH solution or an aqueous sulfuric acid solution may be used.
- a xanthate compound and an amine compound salt are used as the collecting agent.
- the xanthate compound and the salt of the amine compound may be added separately or simultaneously, but are preferably added simultaneously.
- a predetermined amount of the xanthate compound and the salt of the amine compound may be added at once, or may be added in a plurality of times, but is preferably added in a plurality of times.
- a foaming agent is a substance that enhances the stability of foam generated during flotation, and a known one may be used.
- methyl isobutyl carbinol, methyl isobutyl ketone, ethanol, pine oil, Huntsman's “W55 (trade name)” and the like can be used.
- the step of adding iron ore into water, the step of adjusting the pH of the aqueous solution, the step of adding a collection agent, and the step of adding a foaming agent are generally referred to as conditioning.
- the supply time of the foam is not particularly limited, and may be a time until the amount of S contained in the iron ore remaining in the water is 0.08% or less by floating and removing the iron ore containing S.
- the pyrrhotite that has started floating flotation and has floated in the water may be recovered using a scraper and separated.
- the above collecting agent and foaming agent may be added in several steps during the flotation.
- the iron oxide produced by oxidation is sulfided (that is, the reaction proceeds in the direction opposite to the arrow in the above reaction formula), and the produced pyrrhotite is floated using a collector. Therefore, a xanthate compound is used as the collecting agent, and a substance that releases sulfur ions in water is used as the activator.
- xanthate compound known compounds can be used, and those exemplified in the column (1) above can be used.
- Examples of the substance that releases sulfur ions in water include at least one selected from the group consisting of sodium sulfide (Na 2 S), sodium hydrosulfide (NaSH), and sodium thiosulfate (Na 2 S 2 O 3 ). Can be used. Preferably, sodium sulfide (Na 2 S) or sodium hydrosulfide (NaSH) is used.
- the substance that releases sulfur ions in water is preferably added so as to be 10 to 1000 g per ton of iron ore during flotation. More preferably, it is 50 to 250 g per ton of iron ore.
- iron oxide that originally existed in the iron ore as Fe 3 O 4 in addition to iron oxide (Fe 3 O 4 ) generated by oxidation of pyrrhotite. It reacts together, and the yield of iron ore whose sulfur content is reduced to 0.08% or less is lowered.
- a substance that releases sulfur ions in water is added to the aqueous solution in the container charged with iron ore.
- a pH adjuster is added to adjust the pH of the aqueous solution.
- a collection agent and a foaming agent are added, and flotation is performed.
- a collecting agent a xanthate compound can be used, and those exemplified in the column (1) can be used. What is necessary is just to use a well-known thing as a foaming agent, and can use what was illustrated in the column of said (1).
- the obtained iron ore has a sulfur content reduced to 0.08% or less.
- the collector that is, a salt of a xanthate compound and an amine compound
- the activator that is, a substance that releases sulfur ions in water
- the removal rate of sulfur can be increased, so that the amount of sulfur contained in iron ore can be further reduced.
- sulfur is more than 0.08% and 2% or less.
- a method for producing iron ore with the sulfur content reduced to 0.08% or less by flotation of the containing iron ore will be described.
- the description which overlaps with said (1) and (2) is abbreviate
- the pH of the aqueous solution is adjusted by adding a pH adjuster as in (1) above.
- a collection agent and a foaming agent are added, and flotation is performed.
- a collecting agent as in (1) above, a xanthate compound and a salt of an amine compound are used. What is necessary is just to use a well-known thing as a foaming agent, and can use what was illustrated in the column of said (1).
- the obtained iron ore has a sulfur content reduced to 0.08% or less.
- the type of flotation machine to which these chemicals can be applied is not particularly limited, and an agitaire type flotation machine (available from CMT Co., Ltd.), Kyoto University flotation machine, column type flotation machine Etc. can be used.
- Example 1 In Experimental Example 1, flotation of iron ore was performed using a Kyoto University type flotation machine using a xanthate compound and a salt of an amine compound as a collection agent. This will be specifically described below.
- a frozen product of iron ore containing iron as an impurity iron ore containing pyrrhotite
- the reason for using the frozen product is to suppress the oxidation of the pyrrhotite surface as much as possible.
- the average particle size of the prepared pyrrhotite-containing iron ore was about 30 ⁇ m (50% particle size).
- the prepared pyrrhotite-containing iron ore was thawed and the amount of water contained in the pyrrhotite-containing iron ore was measured, it was found to be about 20 g. Therefore, it was found that the frozen product of pyrrhotite-containing iron ore contained 160 g of pyrrhotite by dry mass.
- the component composition of pyrrhotite-containing iron ore is shown in Table 1 below.
- T.W. Fe is the total amount of Fe; S means the total amount of S.
- the prepared pyrrhotite-containing iron ore is found to contain 0.29% of sulfur.
- the prepared frozen product of pyrrhotite-containing iron ore was placed in 360 g of water and stirred. After stirring, the pH of the aqueous solution was measured and found to be about 6.
- sulfuric acid adjusted to a concentration of 0.1 mol / L was added to adjust the pH of the aqueous solution to 5.
- the pH was adjusted by adding sulfuric acid over 3 minutes.
- an aqueous solution containing a xanthate compound was prepared and added to the aqueous solution adjusted in pH.
- potassium amyl xanthate manufactured by Tokyo Chemical Industry Co., Ltd. was used as the xanthate compound.
- Potassium amyl xanthate (180 mg) was added to 50 mL of water to prepare an aqueous potassium amyl xanthate solution. 2 mL of this aqueous solution was sampled and added to the above-adjusted pH solution, and held for 1 minute.
- the mass of the potassium amyl xanthate used is about 45 g per ton of pyrrhotite-containing iron ore.
- an aqueous solution containing a salt of an amine compound was prepared, and further added to the aqueous solution to which the potassium amyl xanthate aqueous solution was added.
- dodecylamine acetate manufactured by Tokyo Chemical Industry Co., Ltd. was used as the salt of the amine compound. 16 mg of dodecylamine acetate was added to 50 mL of water to prepare a dodecylamine acetate aqueous solution, and 2 mL of this aqueous solution was sampled and added to the aqueous solution to which the potassium amyl xanthate aqueous solution was added.
- the mass of the dodecylamine acetate used is about 4 g per ton of pyrrhotite-containing iron ore.
- the amount of sulfur contained in the pyrrhotite-containing iron ore is reduced from 0.29% to 0.04% by performing flotation using a xanthate compound and a salt of an amine compound as a collector. It was found that it can be reduced.
- Example 2 In Experimental Example 2, flotation was performed using a xanthate compound as a collection agent and a substance that releases sulfur ions in water as an activator. This will be specifically described below.
- an aqueous solution containing NaSH as a substance (activator) that releases sulfur ions in water was prepared and added to the stirred aqueous solution.
- NaSH manufactured by Nacalai Tesque was used as a substance (activator) that releases sulfur ions in water.
- 180 mg of NaSH was added to 50 mL of water to prepare an aqueous solution of NaSH, and 2 mL of this aqueous solution was sampled and added to the aqueous solution after stirring, and held for 2.5 minutes.
- sulfur contained in pyrrhotite-containing iron ore is obtained by performing flotation using a xanthate compound as a collection agent and a substance that releases sulfur ions in water such as NaSH as an activator. It has been found that the amount can be reduced from 0.29% to 0.06%.
- Example 3 In Experimental Example 3, flotation was performed under the same conditions as in Experimental Example 2 except that Na 2 S was used instead of NaSH as a substance (activator) that releases sulfur ions in water. That is, in Experimental Example 3, Na 2 S made by Nacalai Tesque was prepared as a substance (activator) that releases sulfur ions in water. 180 mg of this Na 2 S was added to 50 mL of water to prepare an aqueous Na 2 S solution, and 2 mL of this aqueous solution was sampled and added to the stirred aqueous solution in the same manner as in Experimental Example 2 and held for 2.5 minutes.
- the sample remaining in the container was collected, dried, and then subjected to chemical analysis to measure the amount of sulfur contained in the sample. As a result, the sulfur content was 0.06%.
- Example 4 In Experimental Example 4, flotation was performed under the same conditions as in Experimental Example 2 except that the amount of the NaSH aqueous solution used was reduced to 0.5 mL instead of 2 mL. That is, in Experimental Example 4, 180 mg of NaSH was added to 50 mL of water to prepare an aqueous solution of NaSH, 0.5 mL of this aqueous solution was sampled and added to the stirred aqueous solution in the same manner as in Experimental Example 2, and then 2.5 Hold for a minute.
- the sample remaining in the container was collected, dried, and then subjected to chemical analysis to measure the amount of sulfur contained in the sample. As a result, the sulfur content was 0.07%.
- Example 5 In Experimental Example 5, flotation was performed using a xanthate compound and a salt of an amine compound as a collection agent and NaSH as a substance (activator) that releases sulfur ions in water. This will be specifically described below.
- an aqueous solution containing NaSH was prepared as a substance (activator) that releases sulfur ions in water, as in Experimental Example 2, and added to the stirred aqueous solution.
- the sample remaining in the container was collected, dried, and then subjected to chemical analysis to measure the amount of sulfur contained in the sample. As a result, the sulfur content was 0.03%.
- the xanthate compound and the amine compound salt were used in combination with the xanthate compound, rather than using either the amine compound salt or a substance that releases sulfur ions in water (activator). Furthermore, by using a substance (activator) that releases sulfur ions in water, the sulfur content can be further reduced, and the sulfur content in the pyrrhotite-containing iron ore can be reduced from 0.29% to 0.03%. I understood.
- Example 6 In Experimental Example 6, flotation was performed under the same conditions except that the amount of dodecylamine acetate used in Experimental Example 1 was increased to 45 mg. That is, in Experimental Example 6, 45 mg of dodecylamine acetate was placed in 50 mL of water to prepare an aqueous solution of dodecylamine acetate, and 2 mL of this aqueous solution was sampled and added with an aqueous potassium amyl xanthate solution as in Experimental Example 1 above. To the aqueous solution. The calculated mass of dodecylamine acetate is about 55 g per ton of pyrrhotite-containing iron ore.
- the sample remaining in the container was collected, dried, and then subjected to chemical analysis to measure the amount of sulfur contained in the sample. As a result, the sulfur content was 0.07%.
- the amount of sulfur contained in the finally obtained sample could be reduced to 0.08% or less. Even if about 55 g per 1 ton of pyrrhotite containing iron ore is not used, the amount of sulfur can be reduced to 0.08 by using only about 20 g of the amine compound salt per ton of pyrrhotite containing iron ore as in Experimental Example 1. It was found that it can be reduced to less than%.
- Example 7 In Experimental Example 7, flotation was performed under the same conditions except that Acetamine 24 (trade name) manufactured by Kao Corporation was used instead of the dodecylamine acetate used in Experimental Example 1. That is, in Experimental Example 7, Acetamine 24 manufactured by Kao Corporation was used as the salt of the amine compound. Acetamine 24 is a mixture of amine compound salts having a hydrocarbon group having 8 to 18 carbon atoms. 32 mg of acetamine 24 was added to 50 mL of water to prepare an aqueous solution of acetamine 24. 1 mL of this aqueous solution was collected and added to an aqueous solution to which an aqueous potassium amyl xanthate solution was added in the same manner as in Experimental Example 1. About 10 grams of acetamine 24 is added per 1 ton of pyrrhotite-containing iron ore.
- the sample remaining in the container was collected, dried, and then subjected to chemical analysis to measure the amount of sulfur contained in the sample. As a result, the sulfur content was 0.07%.
- the amount of sulfur contained in the finally obtained sample could be reduced to 0.08% or less. It was found that the amount of sulfur contained in the sample can be reduced to 0.08% or less by using a mixture of a salt of an amine compound such as acetamine 24 instead of using a pure product of the salt.
- Example 8 flotation was performed under the same conditions except that the pH of the aqueous solution was 6.5 in Experimental Example 1. That is, in Experimental Example 8, after adjusting the pH of the aqueous solution to 6.5 by adding sulfuric acid adjusted to a concentration of 0.1 mol / L in Experimental Example 1, potassium amyl xanthate was used as in Experimental Example 1. After adding an aqueous solution and an aqueous dodecylamine acetate solution, a foaming agent was added, and flotation was performed.
- the sample remaining in the container was collected, dried, and then subjected to chemical analysis to measure the amount of sulfur contained in the sample. As a result, the sulfur content was 0.076%.
- Example 9 In Experimental Example 9, the flotation was performed using only the xanthate compound as the collection agent in Experimental Example 1. That is, in Experimental Example 9, sulfuric acid adjusted to a concentration of 0.1 mol / L in Experimental Example 1 was added to adjust the pH of the aqueous solution to 5, and then an aqueous potassium amyl xanthate solution was added. The foaming agent was added without adding the salt aqueous solution, and the flotation was performed. The aqueous potassium amyl xanthate solution was added over 1 minute.
- the sample remaining in the container was collected, dried, and then subjected to chemical analysis to measure the amount of sulfur contained in the sample. As a result, the sulfur content was 0.10%.
- Example 10 flotation was performed using only the salt of the amine compound as the collection agent in Experimental Example 1. That is, in Experimental Example 10, after adjusting the pH of the aqueous solution to 5 by adding sulfuric acid adjusted to a concentration of 0.1 mol / L in Experimental Example 1, dodecylamine without adding potassium amyl xanthate aqueous solution. After adding the acetate aqueous solution, the foaming agent was added, and flotation was performed. In addition, after adding dodecylamine acetate aqueous solution, it hold
- the sample remaining in the container was collected, dried, and then subjected to chemical analysis to measure the amount of sulfur contained in the sample. As a result, the sulfur content was 0.13%.
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Abstract
Description
(1)捕収剤として、ザンセート系化合物と、アミン化合物の塩とを用いるか、
(2)捕収剤として、ザンセート系化合物を用い、活性剤として、水中で硫黄イオンを放出する物質を用いるか、或いは
(3)捕収剤として、ザンセート系化合物と、アミン化合物の塩とを用い、活性剤として、水中で硫黄イオンを放出する物質を用いる
点に要旨を有する。
まず、本発明者らは、不純物として少量の硫黄を含有する鉄鉱石を浮遊選鉱して精製するにあたり、一般的に鉄鉱石中で硫黄がどのような形態で存在するかを確認するため、電子顕微鏡(SEM/EDX)による観察を行った。鉄鉱石を樹脂に埋め込み、断面を研磨して撮影した図面代用写真を図1に示す。
磁硫鉄鉱(FeSx)は、空気に触れると容易に表面が酸化する。表面が酸化すると、次の反応が起こり、酸化鉄(Fe3O4)と区別が付かなくなるため、捕収剤を用いた浮遊選鉱による分離は困難となる。
FeSx+O2→Fe3O4+SO2
上記(3)では、上記捕収剤(即ち、ザンセート系化合物とアミン化合物の塩)と、上記活性剤(即ち、水中で硫黄イオンを放出する物質)を併用する。ザンセート系化合物、アミン化合物の塩、および水中で硫黄イオンを放出する物質を用いることによって、硫黄の除去率を高めることができるため、鉄鉱石に含まれる硫黄量を一層低減できる。
実験例1では、捕収剤として、ザンセート系化合物と、アミン化合物の塩を用い、京大式浮選機を用いて鉄鉱石の浮遊選鉱を行った。以下、具体的に説明する。
実験例2では、捕収剤として、ザンセート系化合物を用い、活性剤として水中で硫黄イオンを放出する物質を用いて浮遊選鉱を行った。以下、具体的に説明する。
実験例3では、上記実験例2において、水中で硫黄イオンを放出する物質(活性剤)としてNaSHを用いる代わりにNa2Sを用いる点以外は、同じ条件で浮遊選鉱を行った。即ち、実験例3では、水中で硫黄イオンを放出する物質(活性剤)として、ナカライテスク社製のNa2Sを準備した。このNa2S180mgを、水50mLに入れてNa2S水溶液を調製し、この水溶液を2mL採取して、上記実験例2と同様、攪拌後の水溶液に添加してから2.5分間保持した。
実験例4では、上記実験例2において、用いたNaSH水溶液の量を2mLとする代わりに0.5mLに減らした点以外は、同じ条件で浮遊選鉱を行った。即ち、実験例4では、NaSH180mgを、水50mLに入れてNaSH水溶液を調製し、この水溶液を0.5mL採取して、上記実験例2と同様、攪拌後の水溶液に添加してから2.5分間保持した。
実験例5では、捕収剤として、ザンセート系化合物と、アミン化合物の塩を用い、水中で硫黄イオンを放出する物質(活性剤)としてNaSHを用いて浮遊選鉱を行った。以下、具体的に説明する。
実験例6では、上記実験例1において用いたドデシルアミン酢酸塩の量を45mgに増量する点以外は、同じ条件で浮遊選鉱を行った。即ち、実験例6では、ドデシルアミン酢酸塩45mgを、水50mLに入れてドデシルアミン酢酸塩水溶液を調製し、この水溶液を2mL採取して、上記実験例1と同様、カリウムアミルザンセート水溶液を加えた水溶液に添加した。用いたドデシルアミン酢酸塩の質量は、計算上、磁硫鉄鉱含有鉄鉱石1トンあたり約55gとなる。
実験例7では、上記実験例1において用いたドデシルアミン酢酸塩の代わりに、花王株式会社製のアセタミン24(商品名)を用いる点以外は、同じ条件で浮遊選鉱を行った。即ち、実験例7では、アミン化合物の塩として花王株式会社製のアセタミン24を用いた。アセタミン24は、炭素数が8~18個の炭化水素基を有するアミン化合物の塩の混合物である。32mgのアセタミン24を、水50mLに入れてアセタミン24水溶液を調製し、この水溶液を1mL採取して、上記実験例1と同様、カリウムアミルザンセート水溶液を加えた水溶液に添加した。アセタミン24は、計算上、磁硫鉄鉱含有鉄鉱石1トンあたり約10g添加したことになる。
実験例8では、上記実験例1において水溶液のpHを6.5にする点以外は、同じ条件で浮遊選鉱を行った。即ち、実験例8では、上記実験例1において、濃度0.1mol/Lに調整した硫酸を添加して水溶液のpHを6.5に調整した後、上記実験例1と同様、カリウムアミルザンセート水溶液およびドデシルアミン酢酸塩水溶液を添加してから起泡剤を添加し、浮遊選鉱を行った。
実験例9では、上記実験例1において、捕収剤として、ザンセート系化合物のみを用いて浮遊選鉱を行った。即ち、実験例9では、上記実験例1において、濃度0.1mol/Lに調整した硫酸を添加して水溶液のpHを5に調整した後、カリウムアミルザンセート水溶液を加えたが、ドデシルアミン酢酸塩水溶液は添加せずに、起泡剤を添加し、浮遊選鉱を行った。なお、カリウムアミルザンセート水溶液は、1分間かけて添加した。
実験例10では、上記実験例1において、捕収剤として、アミン化合物の塩のみを用いて浮遊選鉱を行った。即ち、実験例10では、上記実験例1において、濃度0.1mol/Lに調整した硫酸を添加して水溶液のpHを5に調整した後、カリウムアミルザンセート水溶液は添加せずに、ドデシルアミン酢酸塩水溶液を添加してから起泡剤を添加し、浮遊選鉱を行った。なお、ドデシルアミン酢酸塩水溶液を添加してから1分間保持した。
なお、本出願は、2013年6月27日付けで出願された日本特許出願(特願2013-134905)に基づいており、その全体が引用により援用される。
Claims (5)
- 硫黄を0.08%超、2%以下含有する鉄鉱石を浮遊選鉱して硫黄含有量が0.08%以下に低減された鉄鉱石を製造する方法であって、
浮遊選鉱する際に、
(1)捕収剤として、ザンセート系化合物と、アミン化合物の塩とを用いるか、
(2)捕収剤として、ザンセート系化合物を用い、活性剤として、水中で硫黄イオンを放出する物質を用いるか、或いは
(3)捕収剤として、ザンセート系化合物と、アミン化合物の塩とを用い、活性剤として、水中で硫黄イオンを放出する物質を用いる
ことを特徴とする硫黄含有鉄鉱石の製造方法。 - 前記ザンセート系化合物と、前記アミン化合物の塩とを同時に添加する請求項1に記載の製造方法。
- 前記水中で硫黄イオンを放出する物質として、硫化ナトリウム、水硫化ナトリウム、およびチオ硫酸ナトリウムよりなる群から選ばれる少なくとも1種を用いる請求項1に記載の製造方法。
- 前記水中で硫黄イオンを放出する物質として、硫化ナトリウム、水硫化ナトリウム、およびチオ硫酸ナトリウムよりなる群から選ばれる少なくとも1種を用いる請求項2に記載の製造方法。
- 前記浮遊選鉱を、pHが4以上7未満の範囲で行う請求項1~4のいずれか一項に記載の製造方法。
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