CN105483327A - Chrome ore direct alloying ball and manufacturing method and application of chrome ore direct alloying ball - Google Patents

Chrome ore direct alloying ball and manufacturing method and application of chrome ore direct alloying ball Download PDF

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Publication number
CN105483327A
CN105483327A CN201610033806.XA CN201610033806A CN105483327A CN 105483327 A CN105483327 A CN 105483327A CN 201610033806 A CN201610033806 A CN 201610033806A CN 105483327 A CN105483327 A CN 105483327A
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China
Prior art keywords
chrome ore
direct alloying
ore direct
alloying ball
ball
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CN201610033806.XA
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CN105483327B (en
Inventor
陈均
曾建华
张彦恒
杨森祥
杨晓东
王建
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Pangang Group Panzhihua Iron and Steel Research Institute Co Ltd
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Pangang Group Panzhihua Iron and Steel Research Institute Co Ltd
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    • 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
    • C21C7/0068—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by introducing material into a current of streaming metal
    • 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
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24—Binding; Briquetting ; Granulating
    • C22B1/242—Binding; Briquetting ; Granulating with binders
    • C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
    • 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
    • C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
    • C21C2007/0062—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires with introduction of alloying or treating agents under a compacted form different from a wire, e.g. briquette, pellet

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geology (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Manufacturing & Machinery (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Multimedia (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

The invention relates to a chrome ore direct alloying ball and a manufacturing method and application of the chrome ore direct alloying ball and belongs to the technical field of metallurgy. The technical purpose that the chrome ore direct alloying ball is supplied is achieved. The chrome ore direct alloying ball is composed of, by weight percentage, 38% to 45% of Cr2O3, 11% to 15% of C, 2% to 5% of CaO, 3% to 8% of MgO, 15% to 25% of iron and oxide of iron, 3% to 6% of Al2O3, 1% to 3% of CaF2 and the balance impurities. The chrome ore direct alloying ball can be fused rapidly after being added to molten steel, the yield is high, refining time is not prolonged, and the refining effect is not affected.

Description

Chrome ore DIRECT ALLOYING ball and its preparation method and application
Technical field
The present invention relates to chrome ore DIRECT ALLOYING ball and its preparation method and application, belong to metallurgical technology field.
Background technology
Chromium is the important alloying element of smelting stainless steel, interior hot steel, alloy tool steel, structural alloy steel and broad variety cast iron.Along with the development of national economy, need the steel of more stainless, interior heat, high strength, the consumption of Chrome metal powder also increases sharply.And produce these stainless, interior heat, high strength steel product time, often by the alloying adding ferrochrome and carry out chromium, when this makes STEELMAKING PRODUCTION, ferrochrome consumption is large, and cost of alloy is high.In smelting, utilize primary raw materials melting direct-reduction to replace expensive iron alloy, be reduce steel-making cost, one of approach of save energy.Therefore, adopt chrome ore DIRECT ALLOYING to substitute (high-carbon, low-carbon (LC)) ferrochrome and can significantly reduce steelmaking alloy cost.But adopting chrome ore directly to add electric furnace or converter, to there is recovery rate low, and processing parameter is difficult to the problems such as control.
CN104878159A discloses a kind of method improving chrome ore DIRECT ALLOYING molten steel chromium recovery rate, the method is chrome ore, Wingdale, hard coal or coke, ferrosilicon makes powder, add water glass by a certain percentage and become compound, and make cored-wire, in the molten steel be fed in the refining procedure of steel-making, can ensure that compound reacts rapidly under high-temperature molten steel, promote the balance of reaction and the contact area of pulvis and molten steel, contribute to the rate of recovery improving chromium, fusing is difficult to after this invention chrome ore adds, affect recovery rate, and containing C in compound, Si two kinds of reductive agents, use for there being the steel grade of requirement to silicone content and may cause increasing silicon, use has limitation.
CN103509911A discloses a kind of method to chrome-bearing steel DIRECT ALLOYING, comprise the following steps: (1) will according to formula: m1=m0/w, m2=3M (1+t) m0/152, t are 0.2 ~ 0.4 chromite ore fine, the reductive agent mixing calculating quality; (2) add to the molten steel of converter tapping, and pressure be 0.5 ~ 1.5MPa, flow be 150 ~ 300L/min part blowing down reducing gas stir; (3) described ladle is proceeded to LF station, pressure be 0.1 ~ 0.5MPa, flow is that the condition of 60 ~ 150L/min is blown described reducing gas and stirred, and carries out LF ladle furnace refining 10 ~ 50min at temperature 1500 ~ 1700 DEG C.The method adopts chromite ore fine smelting reduction process directly to carry out alloying in refining process, but the method complex steps, complex process, the recovery rate of chromium is only about 90%, and chromite ore fine directly adds, be difficult to fusing after adding, affect the recovery rate of refining effect and chromium.
Summary of the invention
The technical problem that the present invention solves is to provide chrome ore DIRECT ALLOYING ball.
Chrome ore DIRECT ALLOYING ball of the present invention, is made up of the component of following weight percent: Cr 2o 3: 38 ~ 45%, C:11 ~ 15%, CaO:2 ~ 5%, MgO:3 ~ 8%, the oxide compound of iron and iron: 15 ~ 25%, Al 2o 3: 3 ~ 6%, CaF 2: 1 ~ 3%, all the other are impurity.
Wherein, the granularity of described chrome ore DIRECT ALLOYING ball is 10 ~ 25mm.
Second technical problem that the present invention solves is to provide the preparation method of chrome ore DIRECT ALLOYING ball of the present invention.
The preparation method of chrome ore DIRECT ALLOYING ball of the present invention, mixes according to a certain percentage by chromite ore fine, reductive agent, solubility promoter and caking agent, pressure ball drying, obtained chrome ore DIRECT ALLOYING ball.
Wherein, in described chromite ore fine, Cr 2o 3content is not less than 60wt%, and granularity is less than 100 orders.
Conventional reductive agent is all applicable to the present invention, and preferably, described reductive agent is hard coal carburelant, containing the carbon being not less than 90wt%; Described solubility promoter is preferably Fluorspar Powder; Described caking agent is preferably water glass.
The present invention also provides the application of chrome ore DIRECT ALLOYING ball of the present invention in smelting molten steel.
In smelting molten steel, the using method of chrome ore DIRECT ALLOYING ball of the present invention is: the first deoxidation of converter tapping, add ladle with steel stream after deoxidation, add-on is 5 ~ 8kg/t steel.
Chrome ore DIRECT ALLOYING ball of the present invention adds after molten steel can rapid melting, and recovery rate is high, and alloyage process is simple, does not extend refining time, does not affect refining effect.
Embodiment
Chrome ore DIRECT ALLOYING ball of the present invention, is made up of the component of following weight percent: Cr 2o 3: 38 ~ 45%, C:11 ~ 15%, CaO:2 ~ 5%, MgO:3 ~ 8%, the oxide compound of iron and iron: 15 ~ 25%, Al 2o 3: 3 ~ 6%, CaF 2: 1 ~ 3%, all the other are impurity.
The oxide compound of described iron and iron is the summation of the oxide compound of iron and iron, and available general formula FexO represents.
Wherein, the granularity of described chrome ore DIRECT ALLOYING ball is 10 ~ 25mm.
Chrome ore DIRECT ALLOYING ball of the present invention, required component can be adopted conventional method mixing, pressure ball is also dried and is obtained.
In order to reduce costs, preferably adopt and obtaining with the following method: chromite ore fine, reductive agent, solubility promoter and caking agent are mixed according to a certain percentage, also oven dry is obtained for pressure ball.
Wherein, in described chromite ore fine, Cr 2o 3content is not less than 60wt%, and granularity is less than 100 orders.
Conventional reductive agent is all applicable to the present invention, and preferably, described reductive agent is hard coal carburelant, containing the carbon being not less than 90wt%; Described solubility promoter is preferably Fluorspar Powder; Described caking agent is preferably water glass.
The present invention also provides the application of chrome ore DIRECT ALLOYING ball of the present invention in smelting molten steel.
In smelting molten steel, the using method of chrome ore DIRECT ALLOYING ball of the present invention is: the first deoxidation of converter tapping, add ladle with steel stream after deoxidation, add-on is 5 ~ 8kg/t steel.
Below in conjunction with embodiment, the specific embodiment of the present invention is further described, does not therefore limit the present invention among described scope of embodiments.
Embodiment 1
After the deoxidation of certain factory 120t converter tapping, add chrome ore DIRECT ALLOYING ball (Cr with molten steel 2o 3: 38%, C:15%, CaO:5%, MgO:8%, the oxide compound (FexO) of iron and iron: 25%, Al 2o 3: 6%, CaF 2: 3%, all the other are a small amount of impurity, granularity 10 ~ 25mm), add-on is 8kg/t steel, and to LF refining after tapping, better, refining effect is also uninfluenced, and obtaining chromium recovery rate after normal refinery terminates is 92% in refining slag fusing.
Embodiment 2
After the deoxidation of certain factory 120t converter tapping, add chrome ore DIRECT ALLOYING ball (Cr with molten steel 2o 3: 45%, C:11%, CaO:2%, MgO:3%, the oxide compound (FexO) of iron and iron: 15%, Al 2o 3: 3%, CaF 2: 1%, all the other are impurity, granularity 10 ~ 25mm), add-on is 5kg/t steel, and to LF refining after tapping, better, refining effect is also uninfluenced, and obtaining chromium recovery rate after normal refinery terminates is 92% in refining slag fusing.
Embodiment 3
By chromite ore fine, hard coal carburelant, Fluorspar Powder with water glass mixes according to a certain percentage, pressure ball dry obtained chrome ore DIRECT ALLOYING ball, the composition of the chrome ore DIRECT ALLOYING ball obtained is: Cr 2o 3: 40%, C:13%, CaO:4%, MgO:5%, the oxide compound (FexO) of iron and iron: 20%, Al 2o 3: 5%, CaF 2: 2%, all the other are impurity, granularity 10 ~ 25mm.
After the deoxidation of certain factory 120t converter tapping, add chrome ore DIRECT ALLOYING ball (Cr with molten steel 2o 3: 40%, C:13%, CaO:4%, MgO:5%, the oxide compound (FexO) of iron and iron: 20%, Al 2o 3: 5%, CaF 2: 2%, all the other are impurity, granularity 10 ~ 25mm), add-on is 7kg/t steel, and to LF refining after tapping, better, refining effect is also uninfluenced, and obtaining chromium recovery rate after normal refinery terminates is 92% in refining slag fusing.

Claims (6)

1. chrome ore DIRECT ALLOYING ball, is characterized in that, is made up of: Cr the component of following weight percent 2o 3: 38 ~ 45%, C:11 ~ 15%, CaO:2 ~ 5%, MgO:3 ~ 8%, the oxide compound of iron and iron: 15 ~ 25%, Al 2o 3: 3 ~ 6%, CaF 2: 1 ~ 3%, all the other are impurity.
2. chrome ore DIRECT ALLOYING ball according to claim 1, is characterized in that: the granularity of described chrome ore DIRECT ALLOYING ball is 10 ~ 25mm.
3. the preparation method of the chrome ore DIRECT ALLOYING ball described in claim 1 or 2, is characterized in that: chromite ore fine, reductive agent, solubility promoter and caking agent are mixed, pressure ball drying, obtained chrome ore DIRECT ALLOYING ball.
4. the preparation method of chrome ore DIRECT ALLOYING ball according to claim 3, is characterized in that: in described chromite ore fine, Cr 2o 3content is not less than 60wt%, and granularity is less than 100 orders; Described reductive agent is hard coal carburelant, containing the carbon being not less than 90wt%; Described solubility promoter is Fluorspar Powder; Described caking agent is water glass.
5. the application of chrome ore DIRECT ALLOYING ball in smelting molten steel described in claim 1 or 2.
6. the application of chrome ore DIRECT ALLOYING ball according to claim 5 in smelting molten steel, is characterized in that: the using method of described chrome ore DIRECT ALLOYING ball is: the first deoxidation of converter tapping, add ladle with steel stream after deoxidation, add-on is 5 ~ 8kg/t steel.
CN201610033806.XA 2016-01-19 2016-01-19 Chrome ore DIRECT ALLOYING ball and its preparation method and application Active CN105483327B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111455169A (en) * 2020-05-29 2020-07-28 攀钢集团攀枝花钢铁研究院有限公司 Manganese ore directly-alloyed ball and preparation method thereof
CN113699311A (en) * 2021-09-02 2021-11-26 马鞍山市兴达冶金新材料有限公司 Product and method for directly performing chromium alloying on molten steel

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104878159A (en) * 2015-06-02 2015-09-02 钢铁研究总院 Method for increasing yield of molten steel chromium in chromium ore direct-alloying

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104878159A (en) * 2015-06-02 2015-09-02 钢铁研究总院 Method for increasing yield of molten steel chromium in chromium ore direct-alloying

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111455169A (en) * 2020-05-29 2020-07-28 攀钢集团攀枝花钢铁研究院有限公司 Manganese ore directly-alloyed ball and preparation method thereof
CN113699311A (en) * 2021-09-02 2021-11-26 马鞍山市兴达冶金新材料有限公司 Product and method for directly performing chromium alloying on molten steel

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