CN105219920A - Boron-containing sphere additive and preparation method thereof - Google Patents
Boron-containing sphere additive and preparation method thereof Download PDFInfo
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- CN105219920A CN105219920A CN201410284723.9A CN201410284723A CN105219920A CN 105219920 A CN105219920 A CN 105219920A CN 201410284723 A CN201410284723 A CN 201410284723A CN 105219920 A CN105219920 A CN 105219920A
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- 239000000654 additive Substances 0.000 title claims abstract description 33
- 230000000996 additive effect Effects 0.000 title claims abstract description 33
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 229910052796 boron Inorganic materials 0.000 title abstract description 97
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 title abstract description 91
- 239000002994 raw material Substances 0.000 claims abstract description 23
- 239000011230 binding agent Substances 0.000 claims abstract description 19
- 239000000203 mixture Substances 0.000 claims abstract description 9
- 239000000843 powder Substances 0.000 claims abstract description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 41
- 229910052742 iron Inorganic materials 0.000 claims description 19
- 239000011257 shell material Substances 0.000 claims description 18
- 238000002791 soaking Methods 0.000 claims description 14
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 10
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 9
- 239000004568 cement Substances 0.000 claims description 9
- 238000005453 pelletization Methods 0.000 claims description 9
- 239000004927 clay Substances 0.000 claims description 7
- 239000004567 concrete Substances 0.000 claims description 7
- 239000000440 bentonite Substances 0.000 claims description 6
- 229910000278 bentonite Inorganic materials 0.000 claims description 6
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 5
- 235000019353 potassium silicate Nutrition 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 abstract description 67
- 239000010959 steel Substances 0.000 abstract description 67
- 238000003723 Smelting Methods 0.000 abstract description 22
- 239000000853 adhesive Substances 0.000 abstract description 2
- 230000001070 adhesive effect Effects 0.000 abstract description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L calcium carbonate Substances [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 abstract 1
- 229910000019 calcium carbonate Inorganic materials 0.000 abstract 1
- 238000001816 cooling Methods 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 abstract 1
- 229910052595 hematite Inorganic materials 0.000 abstract 1
- 239000011019 hematite Substances 0.000 abstract 1
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 abstract 1
- 238000011084 recovery Methods 0.000 description 35
- 238000000034 method Methods 0.000 description 20
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 229910045601 alloy Inorganic materials 0.000 description 7
- 239000000956 alloy Substances 0.000 description 7
- 238000007670 refining Methods 0.000 description 7
- 241001417490 Sillaginidae Species 0.000 description 6
- 229910000712 Boron steel Inorganic materials 0.000 description 5
- 238000005275 alloying Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 239000002893 slag Substances 0.000 description 3
- 238000009628 steelmaking Methods 0.000 description 3
- 239000004115 Sodium Silicate Substances 0.000 description 2
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052911 sodium silicate Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 229910052726 zirconium Inorganic materials 0.000 description 2
- 229910000521 B alloy Inorganic materials 0.000 description 1
- 229910014458 Ca-Si Inorganic materials 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- ZDVYABSQRRRIOJ-UHFFFAOYSA-N boron;iron Chemical compound [Fe]#B ZDVYABSQRRRIOJ-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009847 ladle furnace Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention provides a boron-containing sphere additive and a preparation method thereof, the additive consists of a shell and a core, wherein the shell comprises B in percentage by weight4C90-95% and a binder 5-10%; core composition wt% B4C20-60%, hematite 10-40%, CaCO310 to 40 percent of binder and 3 to 5 percent of adhesive. Preparing the uniformly mixed core raw material powder into a core ball with the diameter of 20-25 mm, wrapping shell raw material powder with the thickness of 3-5 mm outside the ball, placing the prepared ball in the air for 12-24 h, roasting, correspondingly selecting the heating rate according to the roasting temperature, keeping the temperature for 1-2 h at constant temperature after the roasting temperature reaches 600 ℃, and taking out and cooling to room temperature when the temperature is reduced to be less than or equal to 100 ℃. The boron-containing spherical additive has the advantages of easily available raw materials and low price, can improve the stability of boron in steel when used for producing boron-containing steel, has the boron yield of 70-90 percent, has the boron content deviation of less than 0.0003 percent among each tank time, and can simultaneously reduce the smelting cost.
Description
Technical field
The invention belongs to ferrous metallurgy raw material field, particularly a kind of boracic spheroid additive that accurately can control trace B add-on in boron-containing steel and preparation method thereof.
Background technology
Add trace B (general control is 0.0005% ~ 0.0030%) in steel, its object mainly improves the hardening capacity of steel.Because the chemical property of boron is very active, be easy to the oxygen in steel, nitrogen is combined, make boron ineffective, and Boron contents in steel is few again, so how to ensure that in the smelting of boron steel it is very important for stably obtaining appropriate acid-soluble boron and being evenly distributed in steel.
Tradition smelts the technique of boron-containing steel normally in the middle and later periods of steel-making external refining (LF stove, VD stove, RH stove), by adding the abundant deoxidation of the alloy such as aluminium, zirconium, add the abundant fixed nitrogen of titanium alloy, carry out boron alloyed afterwards again, the feed postition of boron has two kinds: one to be add with ferroboron form; Another kind adds with boracic cored-wire form.Feeding boracic cored-wire mode is adopted to carry out boron alloyed in patent CN1309856C disclosed " production method of continuous small-billet casting low-carbon boron-containing steel ", difference first feeds Ca-Si cored-wire before feeding boracic cored-wire, carry out inclusions class, cleaning molten steel, but the rate of recovery of boron is only 40% ~ 50% after this operation process, be not improved, and need the Mn/S in strict restriction molten steel to be not less than 13.Patent CN101445855A discloses " composite core-spun yarn of a kind of ferro-boron and ferrotianium and application thereof ", describe the preparation method of containing boron, iron and ferrotianium cored-wire, described cored-wire pulvis is the mixture of ferro-boron and ferrotianium, wherein the boron-containing quantity of ferro-boron is not less than 9%, the titaniferous amount of ferrotianium is not less than 25%, and be broken for the granularity being not more than 3mm, make cored-wire, feed after steel liquid deoxidation terminates in molten steel, its effect can make the boron rate of recovery reach more than 90%, Boron contents deviation between stove and stove is less than 0.0003%, the described method of this invention improves the rate of recovery of boron to consume ferrotianium for cost, make cored-wire and require that cored-wire pulvis must have certain granularity, otherwise cannot envelope curve, therefore, in this cored-wire ferro-boron can not completely surround by ferrotianium, so add the scaling loss inherently causing boron in molten steel, affect its recovery rate.Though the cored-wire described in this patent of invention can improve the rate of recovery of boron, there is the common problem of molten steel line feeding equally, namely feed the instability problems such as the degree of depth of molten steel, recovery rate, homogeneity.In addition, the technique making cored-wire is more complicated, and cost is higher.Related documents describes the rate of recovery situation of smelting boron-containing steel boron: describe application traditional technology in document " special steel " the 5th phase in 1992 " metallurgy factor is on the impact of the B rate of recovery in boron steel " and smelt boron-containing steel, adopt the alloy feed postition of deoxidation fixed nitrogen, its optimum content should control at Al:0.02% ~ 0.05%, Ti:0.03% ~ 0.05%, addition sequence is Al-Ti-B, and this kind of technique can make the rate of recovery of boron reach 10% ~ 65%.Adopt in document " special steel " the 2nd phase in 1997 " Application and Development of 60t ladle furnace wire injection procedure " and add boron in LF stove refining later stage feeding boracic cored-wire mode, the boron rate of recovery can be made to reach 85%.Though adopt line feeding mode can improve the rate of recovery of boron in steel, relatively stricter to the specification of quality of cored-wire, its cost is also larger equally.Therefore, traditional smelting process controls very strict to each station processing requirement, and the distribution that the recovery rate of boron is low, boron is in steel is also unstable.
Be different from above-mentioned traditional smelting technology method, " a kind of vacuum metling boron-containing steel improves and stablizes the method for the boron rate of recovery " (CN100580117C) disclose carry out before molten steel vacuum-treat boron alloyed, vacuum-treat post analysis, the boron rate of recovery is more than 90%, and between each stove, Boron contents deviation is less than 0.0002%.Though this technique can stabilize and increase the recovery rate of boron, strict restriction is carried out to slag composition: (%FeO)+(%MnO) <1.50%, (%SiO
2) <15.00%, in addition, the iron alloy such as titanium, zirconium that same consumption is a large amount of, to reduce oxygen, the nitrogen content in molten steel, prevents boron over oxidation." method with the direct smelting boron steel of pig iron containing boron " (CN1296504C) then provides with the method for boracic molten iron for the direct smelting boron steel of raw material, and boracic molten iron adopts blast furnace separating boron iron ore to extract B
2o
3time the one nature boracic metallic product that obtains.But, because in boracic molten iron, silicon and sulphur content are very high, be respectively 2.0% ~ 2.5% and 0.06% ~ 0.1%, so cause the quantity of slag that produces in steelmaking process large, production cost increased.In addition, boron is with B
2o
3form exists, and in steelmaking process, will float up in slag and remove, and reduce the recovery rate of boron.The rate of recovery of boron can be made to reach 69.4% ~ 91.8% in the method for the converter smelting boron-containing steel that " method of boron steel producing converter smelting " (CN100519769) introduces, use ferro-boron to carry out boron alloyed equally, difference in converter tapping process, adds pre-deoxidant carry out pre-deoxidation, is strict with the physical and chemical index of reductor.
In sum, adopting ferro-boron or boracic cored-wire to carry out, molten steel is boron alloyed all there is the problems such as boron recovery rate instability, skewness, therefore, is badly in need of working out a kind of boron alloyed additive newly to improve boron recovery rate and stability problem.Thus, not only improve the recovery rate of boron but also can production cost be reduced.
Summary of the invention
The present invention is intended to solve the problems such as the boron recovery rate of producing boron-containing steel existence is at present low and unstable, uneven, and then provide a kind of raw material to be easy to get, make simple, boron in steel can be made to have higher stability and recovery rate, and boracic spheroid additive that can reduce smelting cost and preparation method thereof.
For this reason, the solution that the present invention takes is:
A kind of boracic spheroid additive, it is characterized in that, described boracic spheroid additive is made up of shell and core two portions, and its shell composition wt% is: B
4c90% ~ 95%, binding agent 5% ~ 10%; Core composition wt% is: B
4c20% ~ 60%, rhombohedral iron ore 10% ~ 40%; CaCO
310% ~ 40%, binding agent 3% ~ 5%;
Described B
4c purity>=90%, CaCO
3purity>=90%; Fe in rhombohedral iron ore
2o
3>=85%, FeO≤1%; And B
4c, rhombohedral iron ore, CaCO
3three kinds of powder granularity≤75 μm;
Described binding agent is one or more mixtures in clay, bentonite, high-alumina cement, wilkinite, water glass, granularity≤100 μm.
A preparation method for boracic spheroid additive, its concrete preparation process is:
1, batch mixing
According to B
4shell material pulvis mixes by the ratio of C90% ~ 95%, binding agent 5% ~ 10%; Again according to B
4c20% ~ 60%, rhombohedral iron ore 10% ~ 40%; CaCO
310% ~ 40%, core raw material pulvis mixes by the ratio of binding agent 3% ~ 5%.
2, pelletizing
First the core raw material pulvis of mixing is carried out pelletizing, make the core ball that diameter is 20 ~ 25mm; Then at the shell material pulvis that spheroid outer layer covers 3 ~ 5mm is thick, forming diameter is the spheroid of 26 ~ 35mm.
The spheroid made is placed 12 ~ 24h in atmosphere to carry out air-dry.
3, roasting
Spheroid feeding stoving oven after air-dry is carried out roasting, and spheroid heats up with stove, and its maturing temperature, temperature rise rate and soaking time are:
Maturing temperature < 200 DEG C, temperature rise rate is 1 ~ 3 DEG C/min;
Maturing temperature 200 DEG C ~ 600 DEG C, temperature rise rate is 3 ~ 5 DEG C/min;
Carry out constant temperature isothermal holding after maturing temperature reaches 600 DEG C, soaking time is 1h ~ 2h, carries out temperature-fall period afterwards, when temperature be down to≤100 DEG C time, take out spheroid, be cooled to room temperature, be i.e. obtained boracic spheroid additive.
Beneficial effect of the present invention is:
Boracic spheroid additive raw material of the present invention is easily produced, and price is low, and preparation method is simple, is convenient to control; Use Additive Production boron-containing steel of the present invention, boron in steel can be made to have higher stability and recovery rate, and boron recovery rate is 70 ~ 90%, and between each tank is secondary, Boron contents deviation is less than 0.0003%, not only can save boron alloy resource, and can reduce smelting cost.Therefore, the present invention no matter from production cost, or boron recovery rate and stability all will be far superior to traditional boron smelting technology method, has good application prospect.
Embodiment
During embodiment is raw materials used, B
4c purity>=90%, CaCO
3purity>=90%; Fe in rhombohedral iron ore
2o
3>=85%, FeO≤1%; And B
4c, rhombohedral iron ore, CaCO
3three kinds of powder granularity≤75 μm; Binding agent granularity≤100 μm.Proportioning raw materials involved by embodiment is wt%.
Embodiment 1:
1. join, batch mixing: by B
4c20%, rhombohedral iron ore 40%, CaCO
335% and 5% clay bond mixes, and forms core raw material pulvis.Meanwhile, by B
4c90% mixes with 10% clay bond, makes shell material pulvis.For subsequent use.
2. pelletizing: first core raw material pulvis is made the ball core that diameter is 20mm, and then outside ball core, wrap up in the shell material pulvis that a layer thickness is 4mm, make the spheroid that diameter is 28mm.The spheroid made is placed 15h in atmosphere air-dry.
3. roasting: the spheroid feeding stoving oven after air-dry is carried out roasting, and concrete maturing temperature, temperature rise rate and soaking time are:
Maturing temperature < 200 DEG C, temperature rise rate is 1 DEG C/min.
Maturing temperature is at 200 ~ 600 DEG C, and temperature rise rate is 3 DEG C/min.
Carry out constant temperature isothermal holding after maturing temperature reaches 600 DEG C, soaking time is 1h, lowers the temperature afterwards, when temperature is down to 100 DEG C, takes out spheroid, is cooled to room temperature, i.e. obtained boracic spheroid additive.
Be the steel for engineering mechanism purpose of 0.0005% ~ 0.0035% by boracic spheroid additive application obtained for embodiment 1 in smelting boron-containing quantity, originally water and time produce 3 tank boron-containing steels altogether.Refining station (LF stove, VD stove, RH stove) transported to by ladle, adopt conventional deoxidation, degassed, alloying process smelts, when N≤0.0020% in molten steel, add 20kg boracic spheroid additive from alloy feed bin after, molten steel samples after only circulating 1 minute and analyzes.Smelting molten steel weight 102t, adds front molten steel Boron contents 0.0004%, adds rear Boron contents 0.0026%, and obtain boron recovery rate 78.8% as calculated, all the other 2 tank steel boron recovery rates are respectively 77.3% and 80.4%.
Embodiment 2
1. join, batch mixing: by B
4c30%, rhombohedral iron ore 30%, CaCO
335% and 5% high-alumina cement binding agent mixes, and forms core raw material pulvis.Meanwhile, by B
4c92% mixes with 8% high-alumina cement binding agent, makes shell material pulvis.For subsequent use.
2. pelletizing: first core raw material pulvis is made the ball core that diameter is 22mm, and then outside ball core, wrap up in the shell material pulvis that a layer thickness is 4mm, make the spheroid that diameter is 30mm.The spheroid made is placed 18h in atmosphere air-dry.
3. roasting: the spheroid feeding stoving oven after air-dry is carried out roasting, and concrete maturing temperature, temperature rise rate and soaking time are:
Maturing temperature < 200 DEG C, temperature rise rate is 2 DEG C/min.
Maturing temperature is at 200 ~ 600 DEG C, and temperature rise rate is 4 DEG C/min.
Carry out constant temperature isothermal holding after maturing temperature reaches 600 DEG C, soaking time is 1.5h, lowers the temperature afterwards, when temperature is down to 80 DEG C, takes out spheroid, is cooled to room temperature, i.e. obtained boracic spheroid additive.
Be the steel for engineering mechanism purpose of 0.0005% ~ 0.0035% by boracic spheroid additive application obtained for embodiment 2 in smelting boron-containing quantity, originally water and time produce 3 tank boron-containing steels altogether.Refining station (LF stove, VD stove, RH stove) transported to by ladle, adopt conventional deoxidation, degassed, alloying process smelts, when N≤0.0020% in molten steel, from alloy feed bin, add 14kg boracic spheroid additive, molten steel samples after only circulating 1 minute and analyzes.Smelting molten steel weight 99t, adds front molten steel Boron contents 0.0003%, adds rear Boron contents 0.0028%, and obtain boron recovery rate 86.7% as calculated, all the other 2 tank steel boron recovery rates are respectively 83.6% and 85.4%.
Embodiment 3
1. join, batch mixing: by B
4c40%, rhombohedral iron ore 30%, CaCO
327%, clay 2%+ water glass 1% mixes, and forms core raw material pulvis.Meanwhile, by B
4c92% mixes with 8% high-alumina cement binding agent, makes shell material pulvis.For subsequent use.
2. pelletizing: first core raw material pulvis is made the ball core that diameter is 23mm, and then outside ball core, wrap up in the shell material pulvis that a layer thickness is 5mm, make the spheroid that diameter is 33mm.The spheroid made is placed 20h in atmosphere air-dry.
3. roasting: the spheroid feeding stoving oven after air-dry is carried out roasting, and concrete maturing temperature, temperature rise rate and soaking time are:
Maturing temperature < 200 DEG C, temperature rise rate is 3 DEG C/min.
Maturing temperature is at 200 ~ 600 DEG C, and temperature rise rate is 5 DEG C/min.
Carry out constant temperature isothermal holding after maturing temperature reaches 600 DEG C, soaking time is 1.5h, lowers the temperature afterwards, when temperature is down to 100 DEG C, takes out spheroid, is cooled to room temperature, i.e. obtained boracic spheroid additive.
Be the steel for engineering mechanism purpose of 0.0005% ~ 0.0035% by boracic spheroid additive application obtained for embodiment 3 in smelting boron-containing quantity, originally water and time produce 3 tank boron-containing steels altogether.Refining station (LF stove, VD stove, RH stove) transported to by ladle, adopt conventional deoxidation, degassed, alloying process smelts, when N≤0.0020% in molten steel, from alloy feed bin, add 11kg boracic spheroid additive, molten steel samples after only circulating 1 minute and analyzes.Smelting molten steel weight 101t, adds front molten steel Boron contents 0.0004%, adds rear Boron contents 0.0030%, and obtain boron recovery rate 89.3% as calculated, all the other 2 tank steel boron recovery rates are respectively 87.2% and 88.6%.
Embodiment 4
1. join, batch mixing: by B
4c50%, rhombohedral iron ore 25%, CaCO
322% and 2% bentonite+1% high-alumina cement binding agent mixes, and forms core raw material pulvis.Meanwhile, by B
4c93% mixes with 2% clay+2% bentonite+2% high-alumina cement+1% bentonite adhesive, makes shell material pulvis.For subsequent use.
2. pelletizing: first core raw material pulvis is made the ball core that diameter is 25mm, and then outside ball core, wrap up in the shell material pulvis that a layer thickness is 4mm, make the spheroid that diameter is 33mm.The spheroid made is placed 18h in atmosphere air-dry.
3. roasting: the spheroid feeding stoving oven after air-dry is carried out roasting, and concrete maturing temperature, temperature rise rate and soaking time are:
Maturing temperature < 200 DEG C, temperature rise rate is 3 DEG C/min.
Maturing temperature is at 200 ~ 600 DEG C, and temperature rise rate is 5 DEG C/min.
Carry out constant temperature isothermal holding after maturing temperature reaches 600 DEG C, soaking time is 2h, lowers the temperature afterwards, when temperature is down to 90 DEG C, takes out spheroid, is cooled to room temperature, i.e. obtained boracic spheroid additive.
Be the steel for engineering mechanism purpose of 0.0005% ~ 0.0035% by boracic spheroid additive application obtained for embodiment 4 in smelting boron-containing quantity, originally water and time produce 3 tank boron-containing steels altogether.Refining station (LF stove, VD stove, RH stove) transported to by ladle, adopt conventional deoxidation, degassed, alloying process smelts, when N≤0.0020% in molten steel, from alloy feed bin, add 9kg boracic spheroid additive, molten steel samples after only circulating 1 minute and analyzes.Smelting molten steel weight 100.3t, adds front molten steel Boron contents 0.0004%, adds rear Boron contents 0.0029%, and obtain boron recovery rate 84.3% as calculated, all the other 2 tank steel boron recovery rates are respectively 82.5% and 85.8%.
Embodiment 5
1. join, batch mixing: by B
4c60%, rhombohedral iron ore 20%, CaCO
315% and 2% wilkinite+2% high-alumina cement+1% sodium silicate binder mixes, and forms core raw material pulvis.Meanwhile, by B
4c93% mixes with 2% clay+2% bentonite+1% high-alumina cement+1% wilkinite+1% sodium silicate binder, makes shell material pulvis.For subsequent use.
2. pelletizing: first core raw material pulvis is made the ball core that diameter is 25mm, and then outside ball core, wrap up in the shell material pulvis that a layer thickness is 3mm, make the spheroid that diameter is 31mm.The spheroid made is placed 18h in atmosphere air-dry.
3. roasting: the spheroid feeding stoving oven after air-dry is carried out roasting, and concrete maturing temperature, temperature rise rate and soaking time are:
Maturing temperature < 200 DEG C, temperature rise rate is 3 DEG C/min.
Maturing temperature is at 200 ~ 600 DEG C, and temperature rise rate is 5 DEG C/min.
Carry out constant temperature isothermal holding after maturing temperature reaches 600 DEG C, soaking time is 2h, lowers the temperature afterwards, when temperature is down to 100 DEG C, takes out spheroid, is cooled to room temperature, i.e. obtained boracic spheroid additive.
Be the steel for engineering mechanism purpose of 0.0005% ~ 0.0035% by boracic spheroid additive application obtained for embodiment 5 in smelting boron-containing quantity, originally water and time produce 3 tank boron-containing steels altogether.Refining station (LF stove, VD stove, RH stove) transported to by ladle, adopt conventional deoxidation, degassed, alloying process smelts, when N≤0.0020% in molten steel, from alloy feed bin, add 7kg boracic spheroid additive, molten steel samples after only circulating 1 minute and analyzes.Smelting molten steel weight 102t, adds front molten steel Boron contents 0.0003%, adds rear Boron contents 0.0026%, and obtain boron recovery rate 82.7% as calculated, all the other 2 tank steel boron recovery rates are respectively 83.8% and 84.3%.
Claims (2)
1. a boracic spheroid additive, is characterized in that, described boracic spheroid additive is made up of shell and core two portions, and its shell composition wt% is: B
4c90% ~ 95%, binding agent 5% ~ 10%; Core composition wt% is: B
4c20% ~ 60%, rhombohedral iron ore 10% ~ 40%; CaCO
310% ~ 40%, binding agent 3% ~ 5%;
Described B
4c purity>=90%, CaCO
3purity>=90%; Fe in rhombohedral iron ore
2o
3>=85%, FeO≤1%; And B
4c, rhombohedral iron ore, CaCO
3three kinds of powder granularity≤75 μm;
Described binding agent is one or more mixtures in clay, bentonite, high-alumina cement, wilkinite, water glass, granularity≤100 μm.
2. a preparation method for boracic spheroid additive as claimed in claim 1, it is characterized in that, concrete preparation process is:
(1) batch mixing
According to B
4shell material pulvis mixes by the ratio of C90% ~ 95%, binding agent 5% ~ 10%; Again according to B
4c20% ~ 60%, rhombohedral iron ore 10% ~ 40%; CaCO
310% ~ 40%, core raw material pulvis mixes by the ratio of binding agent 3% ~ 5%;
(2) pelletizing
First the core raw material pulvis of mixing is carried out pelletizing, make the core ball that diameter is 20 ~ 25mm; Then at the shell material pulvis that spheroid outer layer covers 3 ~ 5mm is thick, forming diameter is the spheroid of 26 ~ 35mm;
The spheroid made is placed 12 ~ 24h in atmosphere to carry out air-dry;
(3) roasting
Spheroid feeding stoving oven after air-dry is carried out roasting, and spheroid heats up with stove, and its maturing temperature, temperature rise rate and soaking time are:
Maturing temperature < 200 DEG C, temperature rise rate is 1 ~ 3 DEG C/min;
Maturing temperature 200 DEG C ~ 600 DEG C, temperature rise rate is 3 ~ 5 DEG C/min;
Carry out constant temperature isothermal holding after maturing temperature reaches 600 DEG C, soaking time is 1h ~ 2h, carries out temperature-fall period afterwards, when temperature be down to≤100 DEG C time, take out spheroid, be cooled to room temperature, be i.e. obtained boracic spheroid additive.
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| CN1245219A (en) * | 1998-08-18 | 2000-02-23 | 李绍兵 | Technology for making compound B-Mg balls and its usage |
| CN101319260A (en) * | 2008-07-17 | 2008-12-10 | 鞍钢股份有限公司 | Process method for controlling accurate addition of trace elements in steel |
| CN102304597A (en) * | 2011-08-26 | 2012-01-04 | 沈阳博联特熔融还原科技有限公司 | Method for smelting iron by utilizing sulfuric acid slag |
| CN103820598A (en) * | 2013-11-25 | 2014-05-28 | 江苏大学 | Slag-regulating and converter-protecting method of boric sludge for slag-splashing converter protection |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1245219A (en) * | 1998-08-18 | 2000-02-23 | 李绍兵 | Technology for making compound B-Mg balls and its usage |
| CN101319260A (en) * | 2008-07-17 | 2008-12-10 | 鞍钢股份有限公司 | Process method for controlling accurate addition of trace elements in steel |
| CN102304597A (en) * | 2011-08-26 | 2012-01-04 | 沈阳博联特熔融还原科技有限公司 | Method for smelting iron by utilizing sulfuric acid slag |
| CN103820598A (en) * | 2013-11-25 | 2014-05-28 | 江苏大学 | Slag-regulating and converter-protecting method of boric sludge for slag-splashing converter protection |
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