WO2021186964A1 - スラグ製品の製造方法及びスラグ製品 - Google Patents
スラグ製品の製造方法及びスラグ製品 Download PDFInfo
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- WO2021186964A1 WO2021186964A1 PCT/JP2021/005095 JP2021005095W WO2021186964A1 WO 2021186964 A1 WO2021186964 A1 WO 2021186964A1 JP 2021005095 W JP2021005095 W JP 2021005095W WO 2021186964 A1 WO2021186964 A1 WO 2021186964A1
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- Prior art keywords
- slag
- steel slag
- boron
- mass
- steel
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- 239000002893 slag Substances 0.000 title claims abstract description 189
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 112
- 239000010959 steel Substances 0.000 claims abstract description 112
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims abstract description 34
- 229910052796 boron Inorganic materials 0.000 claims abstract description 34
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052810 boron oxide Inorganic materials 0.000 claims abstract description 15
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 42
- 239000002994 raw material Substances 0.000 claims description 7
- 230000005606 hygroscopic expansion Effects 0.000 abstract 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 124
- 239000000395 magnesium oxide Substances 0.000 description 65
- 239000000047 product Substances 0.000 description 32
- 238000006703 hydration reaction Methods 0.000 description 14
- 238000007670 refining Methods 0.000 description 14
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 12
- 239000000292 calcium oxide Substances 0.000 description 12
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 12
- 230000036571 hydration Effects 0.000 description 12
- 230000032683 aging Effects 0.000 description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 238000005259 measurement Methods 0.000 description 8
- 239000000523 sample Substances 0.000 description 8
- 229910004298 SiO 2 Inorganic materials 0.000 description 7
- 238000003723 Smelting Methods 0.000 description 5
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 5
- 238000000691 measurement method Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000002131 composite material Substances 0.000 description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 239000011707 mineral Substances 0.000 description 4
- 238000009628 steelmaking Methods 0.000 description 4
- 239000006227 byproduct Substances 0.000 description 3
- 239000004035 construction material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000003628 erosive effect Effects 0.000 description 3
- 238000007572 expansion measurement Methods 0.000 description 3
- 239000011777 magnesium Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000010298 pulverizing process Methods 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000004453 electron probe microanalysis Methods 0.000 description 2
- VGTPKLINSHNZRD-UHFFFAOYSA-N oxoborinic acid Chemical compound OB=O VGTPKLINSHNZRD-UHFFFAOYSA-N 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 238000002411 thermogravimetry Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical group C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000002969 artificial stone Substances 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- UYANAUSDHIFLFQ-UHFFFAOYSA-N borinic acid Chemical compound OB UYANAUSDHIFLFQ-UHFFFAOYSA-N 0.000 description 1
- ZADPBFCGQRWHPN-UHFFFAOYSA-N boronic acid Chemical compound OBO ZADPBFCGQRWHPN-UHFFFAOYSA-N 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- UQGFMSUEHSUPRD-UHFFFAOYSA-N disodium;3,7-dioxido-2,4,6,8,9-pentaoxa-1,3,5,7-tetraborabicyclo[3.3.1]nonane Chemical compound [Na+].[Na+].O1B([O-])OB2OB([O-])OB1O2 UQGFMSUEHSUPRD-UHFFFAOYSA-N 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- -1 for example Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000010801 sewage sludge Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B5/00—Treatment of metallurgical slag ; Artificial stone from molten metallurgical slag
- C04B5/06—Ingredients, other than water, added to the molten slag or to the granulating medium or before remelting; Treatment with gases or gas generating compounds, e.g. to obtain porous slag
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D15/00—Handling or treating discharged material; Supports or receiving chambers therefor
-
- 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
Definitions
- the present invention relates to a method for manufacturing a slag product and a slag product.
- a steel slag hydrated solidified body which is a material mainly composed of steelmaking slag and blast furnace slag fine powder, can be produced by using a kneading facility in the same manner as concrete.
- the steel slag hydrated solidified material may be used as an artificial stone material such as a harbor civil engineering material or a roadbed material. Civil engineering and construction materials and steel slag hydrated solidified products made from such slag are called slag products.
- magnesium may be used. Further, in the steelmaking process, in order to prevent erosion and erosion of the refractory refractory, a required amount of magnesium oxide is usually added to the molten slag. Some of the MgO in the slag cooled from this state forms a composite oxide with CaO, Al 2 O 3 , SiO 2, and the like, but the others exist in the state of MgO as they are.
- the composite oxide formed from CaO, Al 2 O 3 , SiO 2, etc. and MgO is a stable compound that hardly reacts at room temperature.
- MgO hereinafter, also referred to as free MgO
- slag containing a simple magnesium oxide phase may be pulverized due to volume expansion when used as a hydrated solidified steel slag, and cannot be effectively used.
- CaO in the slag also causes volume expansion associated with the hydration reaction like MgO.
- steam aging in which slag is steamed with steam at 100 ° C.
- pressurized steam aging in which slag is steamed at 100 ° C. or higher (equivalent to 180 ° C. at 10 atm) in a high-pressure autoclave tank. .. All of these methods correspond to the accelerated aging described in JIS A 5015 “Road Steel Slag”.
- the volume expansion associated with hydration in MgO and CaO is also referred to as "hydration expansion”.
- Patent Document 1 proposes a method of suppressing pulverization due to ⁇ transformation of 2CaO ⁇ SiO 2 by setting the boron concentration to 0.010 to 0.050% by mass with respect to the molten slag. ing. This is a technique aimed at suppressing pulverization, and its upper limit corresponds to 0.16% when converted to boron oxide.
- MgO has a lower hydration rate than CaO. Therefore, when trying to suppress the hydration expansion of MgO by using the above-mentioned steam aging or pressurized steam aging, a long-term aging treatment is required, which requires a large processing cost and time. Further, in the method of Patent Document 1, as a result of investigation by the present inventor, it was confirmed that the hydration and expansion of free MgO may not be sufficiently suppressed for slag containing free MgO.
- an object of the present invention is to provide a method for producing a slag product and a slag product in which the hydration and expansion of slag containing free MgO is suppressed. ..
- a method for producing a slag product using steel slag when the slag product is produced using the slag obtained by cooling and solidifying the molten steel slag as a raw material, the above. After adding boron corresponding to 30 parts by mass or more in terms of boron oxide to 100 parts by mass of free MgO contained in the steel slag to the molten steel slag and mixing the steel slag to which the boron is added. , A method for producing a slag product, which cools and solidifies the steel slag, is provided.
- the present invention is a slag product manufactured by using steel slag, and the amount of boron contained is 30 parts by mass or more in terms of boron oxide with respect to 100 parts by mass of free MgO contained. Slag products are provided.
- a method for producing a slag product and a slag product in which the hydration and expansion of slag containing free MgO is suppressed is provided.
- the target slag in this embodiment is steel slag generated in various refining processes performed in refining equipment such as converters, electric furnaces, and melt reduction furnaces. Further, this steel slag contains free MgO. Free MgO is MgO that exists as a single magnesium oxide phase that does not form a composite oxide, that is, MgO that is a mineral phase at room temperature, and is also called free magnesium oxide. Further, the steel slag may contain free MgO, and may contain other components (for example, basicity, which is the ratio of CaO concentration to SiO 2 concentration, or free CaO (mineral phase CaO at room temperature, free calcium oxide). The content rate, etc.) is not particularly limited.
- the steel slag targeted in the present embodiment is preferably steel slag generated in a refining process including reduction refining used in the production of stainless steel and the like.
- Such steel slag has a higher content of MgO and free MgO and a lower content of free CaO than the steel slag generated in the refining process used in the production of general ordinary steel.
- steel slag generated by refining processing including reduction refining has a lower effect of suppressing hydration expansion due to steam aging and pressurized steam aging than other steel slags, and is therefore particularly applicable to slag products. It was difficult.
- boron is added to the molten steel slag and mixed (addition step).
- boron is added according to the mass of free MgO of steel slag.
- Boron added is boron oxide (B 2 O 3), boric acid (H 3 BO 3), boronic acid (H 3 BO 2), borinic acid (H 3 BO), metaboric acid (HBO 2), metaboric acid It is sodium (NaBO 2 ) or sodium tetraborate (Na 2 B 4 O 7 ).
- boron corresponding to 30 parts by mass or more in terms of boron oxide is added to 100 parts by mass of free MgO. More preferably, boron corresponding to 45 parts by mass or more in terms of boron oxide is added to 100 parts by mass of free MgO.
- the upper limit of the amount of boron added is not particularly limited, but it may be appropriately set according to the specifications and specifications of the target slag product.
- the mass of free MgO in steel slag is determined based on the mass ratio (content rate) of free MgO in steel slag measured or estimated by the following method and the mass of steel slag.
- the measurement is performed by the following method. In the measurement of the mass ratio of free MgO, a part of the molten steel slag is sampled and cooled to prepare a sample. Next, the mass ratio of free MgO in this sample is measured. At this time, the measurement method described in "Development of free-MgO analysis technology in slag" (Iron and Steel, The Iron and Steel Institute of Japan, 2016, Vol.102, No.1, p.24-28) is used.
- the mass ratio of free MgO is calculated by combining the dissolution of slag using ethylene glycol and the quantification of Mg (OH) 2 by the thermal weight measurement method.
- steel slag is collected at multiple points, and the steel slag is mixed and crushed to prepare a sample, thereby improving the reliability of measurement.
- the estimation is performed by the following method. If the operating conditions are the same, it can be assumed that the steel slag has almost the same slag composition. Therefore, if a part of the sample is taken as needed and the mass ratio of free MgO is measured, the mass ratio of free MgO of steel slag generated under the same operating conditions can be estimated. Further, as the operating conditions used in estimating the mass ratio of free MgO, conditions that generally affect the slag composition can be used. For example, as operating conditions, conditions such as the type and amount of auxiliary raw materials (slag slag, etc.) used, the composition of components before and after the treatment of molten iron, and the mass of molten iron can be considered.
- the mass of the steel slag can be obtained from the difference by measuring the mass of the slag pot before and after discharging the molten steel slag into the slag pot, which is a dedicated pot.
- the mass of the generated steel slag may be obtained from the mass balance between the raw material to be added and the auxiliary raw material. .. Then, by multiplying the obtained mass of the steel slag by the measured or estimated mass ratio of the free MgO, the mass of the free MgO in the target steel slag can be obtained.
- a method of adding boron to the molten steel slag in the addition step there are a method of adding it into the furnace of various smelting furnaces, a method of adding it to the steel slag transferred or stored in the smelting pot, and the like. ..
- boron is added in the furnace at the final stage of refining in the smelting furnace.
- the boron-added steel slag is mixed according to the refining process in the refining furnace.
- the steel slag is cooled to solidify (cool and solidify) (cooling process).
- the steel slag may be subjected to an aging treatment. For example, in the case of steel slag generated in a refining process including reduction refining used in the production of stainless steel, it is judged that the suppression of hydration expansion of free CaO is sufficient because the basicity of the steel slag is low. If so, the aging process may not be performed.
- slag products are manufactured using the cooled and solidified steel slag as a raw material.
- the cooled and solidified steel slag may be pulverized and, if necessary, magnetically separated and then processed to a predetermined particle size (for example, 40 mm or less or 25 mm or less) as a raw material for the slag product.
- a method for producing slag products from cooled and solidified steel slag a well-known method for producing slag products such as civil engineering and construction materials and steel slag hydrated solidified products can be used. Since the hydration reaction of MgO is suppressed in the steel slag produced in this manner, it can be used as an aggregate for a steel slag hydrated solidified body having less volume expansion, for example.
- the slag product manufactured by the above method for manufacturing the slag product has the following features.
- the slag product according to the present embodiment is a slag product manufactured by using steel slag, and the amount of boron contained is 30 parts by mass or more in terms of boron oxide with respect to 100 parts by mass of free MgO contained. More preferably, the steel slag product contains 45 parts by mass or more of boron in terms of boron oxide with respect to 100 parts by mass of free MgO contained.
- the measurement is performed by a method using ethylene glycol and a thermogravimetric analysis method, but the present invention is not limited to such an example.
- a method for measuring free MgO a method of identifying a peak derived from free MgO from the X-ray peak of steel slag and quantifying the peak, or a method of embedding particulate steel slag in a resin or the like and polishing it is performed.
- Other methods such as a method of identifying the MgO mineral phase with an electron probe microanalyzer (EPMA method) and calculating the weight ratio from the area ratio may be used.
- EPMA method electron probe microanalyzer
- the method for measuring the mass ratio of free MgO is preferably a measurement method using ethylene glycol and a thermogravimetric measurement method, as in the above embodiment.
- the method for producing a slag product according to one aspect of the present invention is a method for producing a slag product using steel slag, wherein the slag product is made from slag obtained by cooling and solidifying molten steel slag.
- boron corresponding to 30 parts by mass or more in terms of boron oxide with respect to 100 parts by mass of free MgO contained in the steel slag is added to the molten steel slag, and the steel slag to which boron is added is mixed. After that, the steel slag is cooled and solidified.
- the added boron suppresses the hydration expansion of free MgO in the steel slag. This is because when the steel slag is exposed to an environment containing water, a layer containing boron is formed on the surface of the free MgO in the steel slag, and this layer suppresses the contact between the free MgO and water. Presumed. Further, in the configuration of (1) above, since it is only necessary to add boron to the molten steel slag and mix it, the hydration expansion of free MgO can be suppressed easily and in a short time.
- the slag product according to one aspect of the present invention is a slag product manufactured using steel slag, and the amount of boron contained is 30 parts by mass in terms of boron oxide with respect to 100 parts by mass of free MgO contained. It is more than a part. According to the configuration of the above (2), the same effect as the above (1) can be obtained.
- the mass ratio of free MgO of various steel slags generated in a steel mill was investigated. Further, the mass ratio of the free MgO was calculated by a method using ethylene glycol and a thermogravimetric analysis method. Table 1 shows the measurement results of the basicity (CaO / SiO 2 ), the mass ratio of MgO, and the mass ratio of free MgO of the six types of steel slags A to D investigated. Further, a predetermined amount of boron oxide B 2 O 3 was put into each steel slag into the refining furnace at the final stage of refining. Then, the obtained steel slag was cooled and solidified and crushed to have a size of 25 mm under. Then, the following expansion measurement was performed on the obtained steel slag.
- the obtained steel slag was crushed and sieved to 2 mm and 1.2 mm.
- 15 g of 2 to 1.2 mm steel slag and 15 g of 1.2 to 0 mm steel slag were mixed to prepare 3 samples per condition.
- each sample was compression-molded into a cylinder having a diameter of 25 mm.
- each compression-molded sample was immersed in water at 80 ° C., and the amount of expansion was measured for 10 days.
- the expansion rate tended to decrease as the amount of boron added increased.
- a steel slag hydrated solidified body was prepared using the same steel slag. After that, the obtained solidified body is immersed in water at 80 ° C., and the specimen is observed after 30 days, and the one that cracks is "bad” and the one that produces a very slight pop-out within 10 mm in diameter. Was evaluated as "good”, and a healthy one with no abnormality in appearance was evaluated as "excellent”. The results are shown in Table 2 and FIG. In FIG. 1, the evaluation results of bad, good, and excellent are indicated by ⁇ , ⁇ , and ⁇ , respectively.
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Abstract
Description
このため、単体の酸化マグネシウム相を含有するスラグは、鉄鋼スラグ水和固化体として使用する時に体積膨張により粉化することがあり、有効に使用することができない。
また、例えば、特許文献1には、溶融スラグに対してホウ素濃度を0.010~0.050質量%とすることで、2CaO・SiO2のγ変態に伴う粉化を抑制する手法が提案されている。これは粉化抑制を目的とした技術であり、酸化ホウ素に換算するとその上限は0.16%に相当する。
また、特許文献1の方法では、本発明者が調べたところ、フリーMgOを含有するスラグに対しては、フリーMgOの水和膨張が十分に抑制されない場合があることが確認された。
本発明の一態様によれば、鉄鋼スラグを用いて製造されるスラグ製品であって、含有されるフリーMgO100質量部に対して、含有されるホウ素が酸化ホウ素換算で30質量部以上である、スラグ製品が提供される。
本実施形態において対象とするスラグは、転炉や電気炉、溶融還元炉などの精錬設備で行われる各種の精錬処理にて発生する鉄鋼スラグである。また、この鉄鋼スラグには、フリーMgOが含まれる。フリーMgOは、複合酸化物を形成しない単体の酸化マグネシウム相として存在するMgO、つまり常温で鉱物相のMgOであり、遊離酸化マグネシウムともいう。また、鉄鋼スラグは、フリーMgOを含んでいればよく、他の成分(例えば、SiO2濃度に対するCaO濃度の比である塩基度や、フリーCaO(常温で鉱物相のCaO、遊離酸化カルシウム)の含有率等)については特に限定されない。
鉄鋼スラグ中のフリーMgOの質量割合を測定する場合、以下の方法によって測定が行われる。フリーMgOの質量割合の測定では、溶融状態の鉄鋼スラグの一部を採取し、冷却することでサンプルとする。次いで、このサンプル中のフリーMgOの質量割合を測定する。この際、「スラグ中free-MgO分析技術の開発」(鉄と鋼、日本鉄鋼協会、2016年、Vol.102、No.1、p.24-28)に記載の測定方法を用いる。この測定方法では、エチレングリコールを用いたスラグの溶解と、熱重量測定法によるMg(OH)2の定量とを組み合わせることで、フリーMgOの質量割合が算出される。なお、この測定方法では、鉄鋼スラグの採取を多点で行い、それらの鉄鋼スラグを混合して破砕することで試料を作製することによって、測定の信頼性が向上する。
そして、求められた鉄鋼スラグの質量に、測定又は推定したフリーMgOの質量割合を掛けることで、対象とする鉄鋼スラグ中のフリーMgOの質量を求めることができる。
上記のスラグ製品の製造方法にて製造されるスラグ製品は、以下の特徴を有する。本実施形態に係るスラグ製品は、鉄鋼スラグを用いて製造されるスラグ製品であって、含有されるフリーMgO100質量部に対して、含有されるホウ素が酸化ホウ素換算で30質量部以上である。より好ましくは、鉄鋼スラグ製品は、含有されるフリーMgO100質量部に対して、含有されるホウ素が酸化ホウ素換算で45質量部以上である。
以上で、特定の実施形態を参照して本発明を説明したが、これら説明によって発明を限定することを意図するものではない。本発明の説明を参照することにより、当業者には、開示された実施形態とともに種々の変形例を含む本発明の別の実施形態も明らかである。従って、特許請求の範囲に記載された発明の実施形態には、本明細書に記載したこれらの変形例を単独または組み合わせて含む実施形態も網羅すると解すべきである。
(1)本発明の一態様に係るスラグ製品の製造方法は、鉄鋼スラグを用いたスラグ製品の製造方法であって、溶融状態の鉄鋼スラグを冷却して固化させたスラグを原料としてスラグ製品を製造する際に、鉄鋼スラグに含有されるフリーMgO100質量部に対して酸化ホウ素換算で30質量部以上に相当するホウ素を、溶融状態の鉄鋼スラグに添加し、ホウ素が添加された鉄鋼スラグを混合した後、鉄鋼スラグを冷却固化する。
上記(2)の構成によれば、上記(1)と同様な効果が得られる。
なお、2CaO・SiO2のγ変態に伴う粉化の抑制という観点から考えると、本実施例の割合で添加される酸化ホウ素は十分な量である。本実施例のスラグを25mmアンダーに破砕した段階でその外観を観察したところ、粉状のスラグは観察されなかった。またX線にて鉱物相を確認したところγ形態の2CaO・SiO2はいずれも全く確認されなかった。
Claims (2)
- 鉄鋼スラグを用いたスラグ製品の製造方法であって、
溶融状態の前記鉄鋼スラグを冷却して固化させたスラグを原料として前記スラグ製品を製造する際に、
前記鉄鋼スラグに含有されるフリーMgO100質量部に対して酸化ホウ素換算で30質量部以上に相当するホウ素を、溶融状態の前記鉄鋼スラグに添加し、
前記ホウ素が添加された前記鉄鋼スラグを混合した後、前記鉄鋼スラグを冷却固化する、スラグ製品の製造方法。 - 鉄鋼スラグを用いて製造されるスラグ製品であって、
含有されるフリーMgO100質量部に対して、含有されるホウ素が酸化ホウ素換算で30質量部以上である、スラグ製品。
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TWI817604B (zh) * | 2022-07-11 | 2023-10-01 | 中國鋼鐵股份有限公司 | 耐火材料調質轉爐石及其製造方法 |
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TWI817604B (zh) * | 2022-07-11 | 2023-10-01 | 中國鋼鐵股份有限公司 | 耐火材料調質轉爐石及其製造方法 |
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