CN107385213A - A kind of method that chromite ore fine directly enters stove smelting high carbon ferrochrome - Google Patents
A kind of method that chromite ore fine directly enters stove smelting high carbon ferrochrome Download PDFInfo
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- CN107385213A CN107385213A CN201710533344.2A CN201710533344A CN107385213A CN 107385213 A CN107385213 A CN 107385213A CN 201710533344 A CN201710533344 A CN 201710533344A CN 107385213 A CN107385213 A CN 107385213A
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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
- C22B4/00—Electrothermal treatment of ores or metallurgical products for obtaining metals or alloys
- C22B4/06—Alloys
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- 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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
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Abstract
The invention provides a kind of method that chromite ore fine directly enters stove smelting high carbon ferrochrome, and chromite ore fine, chromium lump ore, silica, coke are well mixed and obtain compound, MgO and Al in compound2O3Mass ratio be 0.8 ~ 1.3；Mineral hot furnace is added mixture into, and as the sinking of furnace charge in stove supplements virgin material in time, keeps charge level concordant with fire door；In smelting process, in-furnace temperature is controlled at 1650~1700 DEG C, interval goes out an iron in 2~3 hours；Molten iron casts after skimming, is granulated and obtains high carbon ferro-chrome.The present invention is by adjusting MgO and Al during high-carbon chrome iron for smelting2O3Ratio, the energy of control in-furnace slag is uniformly distributed, material suspension phenomenon will not be produced, avoid and material spray is produced in smelting process, solve the technical barrier that high-carbon chrome iron for smelting directly uses fine ore, without pelletizing, sintering, pressure ball etc., technique is simple, equipment investment is reduced, for one ton of high carbon ferro-chrome of production than low 300~400 yuan or so of powder mine sintering, pellet forming process, economic benefit is fairly obvious.
Description
Technical field
The present invention relates to a kind of high carbon ferro-chrome, and in particular to a kind of method of chromite ore fine smelting high carbon ferrochrome.
Background technology
The raw material of smelting chromium irons is mainly chromium lump ore and chromite ore fine.Wanted because smelting process has to the gas permeability of furnace charge
Ask, chromium lump ore is more suitable for smelting.As chromium ore resource demand increasingly increases, it is adapted to the chromium lump ore for directly entering stove fewer and fewer,
Price is also climbed to a higher point therewith.
Chromite ore fine is better than chromium lump ore in grade and in price, but chromite ore fine directly enters stove smelting, can make mineral hot furnace
Gas permeability can be deteriorated, and working of a furnace fluctuation is big, easily cause material spray, the fiery phenomenon of thorn, cause unit consumption, the power consumption increase of raw material, meeting when serious
Cause industrial accident.Therefore it is the effective way that solution chromite ore fine utilizes chromite ore fine to be carried out into agglomeration processing, at present generally
The agglomeration method of use has briquetting, sintering and pelletizing etc..
Application for a patent for invention " CN101608261A " discloses a kind of method of producing high carbon ferro-chrome by using chromite powder, by single chromium
Fine ore carries out mix with binding agent and slag former, carries out cold pressing pelletizing, and Balling time is 10~15 minutes, the ball by caused by
Group carries out screening separation, and qualified pelletizing is that finished product is put in storage, use to be produced, while the powder recycling sifted out is returned and mixed
Material, will be finished pellet after manufactured pelletizing natural air drying, and finished pellet is directly added into mineral hot furnace production with solvent, reducing agent
Obtain high carbon ferro-chrome.The patent is had the advantage that using chromite ore fine, advance slag making, is directly entered mineral hot furnace production high carbon ferro-chrome, still
Need to add binding agent cold pressing pelletizing, complex process, while pressure ball cost is high.
The content of the invention
Goal of the invention：It is an object of the invention to for problems of the prior art, there is provided a kind of chromite ore fine is straight
The method for accessing stove smelting high carbon ferrochrome, makes full use of chromite ore fine, can both meet production requirement, and and can simplifies technique, reduces and throw
Provide, increase economic efficiency.
Technical scheme：A kind of method that chromite ore fine directly enters stove smelting high carbon ferrochrome, comprises the following steps：
(1) chromite ore fine, chromium lump ore, silica, coke are well mixed and obtain compound, MgO and Al in compound2O3Matter
Amount is than being 0.8~1.3；
(2) mineral hot furnace is added mixture into, and as the sinking of furnace charge in stove supplements virgin material in time, keeps charge level and fire door
Concordantly；
(3) in smelting process, in-furnace temperature is controlled at 1650~1700 DEG C, interval goes out an iron in 2~3 hours；
(4) molten iron casts after skimming, is granulated and obtains high carbon ferro-chrome.
In order to further improve the gas permeability of furnace charge, the granularity of chromite ore fine is less than 2mm, and the granularity of coke is 15~30mm,
The granularity of silica is 20~60mm；Per 750~850kg of 1000kg chromite ore fines collocation chromium lump ore, silica in step (1) compound
100~150kg, 210~230kg of coke.
Inventive principle：During high-carbon chrome iron for smelting, the resistance of slag is the principal element for influenceing inputing power distribution,
And MgO and Al3O2Ratio determine the size of slag resistance, by regulating and controlling slag composition, priority control MgO and Al2O3Ratio
Value, is uniformly distributed the power in mineral hot furnace molten bath, does not produce power concentrated area, make the Energy distribution of slag in molten bath more
Uniformly, the balanced condition declined of stock column is created, furnace charge will not be accumulated upwards in vertical direction, but in flat in molten bath zone
Shape is uniformly distributed, and local material suspension phenomenon does not occur, so as to technically ensure that not material spray, is provided for mineral hot furnace using fine ore
Necessary condition.
Beneficial effect：The present invention is by adjusting MgO and Al during high-carbon chrome iron for smelting2O3Ratio, control in-furnace slag
Energy be uniformly distributed, material suspension phenomenon will not be produced, avoid and material spray is produced in smelting process, it is straight to solve high-carbon chrome iron for smelting
The technical barrier using fine ore is connect, without pelletizing, sintering, pressure ball etc., technique is simple, reduces equipment investment, produces one ton of high-carbon
For ferrochrome than low 300~400 yuan or so of powder mine sintering, pellet forming process, economic benefit is fairly obvious.
Brief description of the drawings
Fig. 1 is the furnace charge distribution of shapes figure in present invention smelting molten bath.
Embodiment
Technical solution of the present invention is described in detail below, but protection scope of the present invention is not limited to the implementation
Example.
Embodiment：
Embodiment 1：A kind of method that chromite ore fine directly enters stove smelting high carbon ferrochrome, concrete operations are as follows：
(1) chromite ore fine, chromium lump ore, silica, coke are pressed into the dispensing of table 1, it is well mixed to obtain compound, wherein, compound
Middle MgO and Al2O3Mass ratio be 0.93；
The dispensing detail list of 1 embodiment of table 1
(2) compound adds mineral hot furnace through tremie pipe, and as the sinking of furnace charge in stove supplements virgin material in time, to keep expecting
Face is concordant with fire door；
(3) in smelting process, in-furnace temperature is controlled at 1650~1700 DEG C, interval goes out an iron, molten iron in 2~3 hours
Released simultaneously from tapping hole with clinker；
(4) molten iron casts after skimming, is granulated and obtains high carbon ferro-chrome, and high carbon ferro-chrome composition is shown in Table 2：
The alloying component table of 2 embodiment of table 1
Through measuring and calculating, 1 ton of 400 yuan lower than powder mine sintering or pellet forming process or so of high carbon ferro-chrome is produced, economic benefit is obvious.
Embodiment 2：A kind of method that chromite ore fine directly enters stove smelting high carbon ferrochrome, concrete operations are as follows：
(1) chromite ore fine, chromium lump ore, silica, coke are pressed into the dispensing of table 3, it is well mixed to obtain compound, wherein, compound
Middle MgO and Al2O3Mass ratio be 1.06；
The dispensing detail list of 3 embodiment of table 2
(2) compound adds mineral hot furnace through tremie pipe, and as the sinking of furnace charge in stove supplements virgin material in time, to keep expecting
Face is concordant with fire door；
(3) in smelting process, in-furnace temperature is controlled at 1650~1700 DEG C, interval goes out an iron, molten iron in 2~3 hours
Released simultaneously from tapping hole with clinker；
(4) molten iron casts after skimming, is granulated and obtains high carbon ferro-chrome, and high carbon ferro-chrome composition is shown in Table 4：
The 2-in-1 golden component list of the embodiment of table 4
Through measuring and calculating, 1 ton of 350 yuan lower than powder mine sintering or pellet forming process or so of high carbon ferro-chrome is produced, economic benefit is obvious.
Embodiment 3：A kind of method that chromite ore fine directly enters stove smelting high carbon ferrochrome, concrete operations are as follows：
(1) chromite ore fine, chromium lump ore, silica, coke are pressed into the dispensing of table 1, it is well mixed to obtain compound, wherein, compound
Middle MgO and Al2O3Mass ratio be 0.8；
The dispensing detail list of 5 embodiment of table 3
(2) compound adds mineral hot furnace through tremie pipe, and as the sinking of furnace charge in stove supplements virgin material in time, to keep expecting
Face is concordant with fire door；
(3) in smelting process, in-furnace temperature is controlled at 1650~1700 DEG C, interval goes out an iron, molten iron in 2~3 hours
Released simultaneously from tapping hole with clinker；
(4) molten iron casts after skimming, is granulated and obtains high carbon ferro-chrome, and high carbon ferro-chrome composition is shown in Table 6：
The alloying component table of 6 embodiment of table 3
Through measuring and calculating, 1 ton of 300 yuan lower than powder mine sintering or pellet forming process or so of high carbon ferro-chrome is produced, economic benefit is obvious.
Embodiment 4：A kind of method that chromite ore fine directly enters stove smelting high carbon ferrochrome, concrete operations are as follows：
(1) chromite ore fine, chromium lump ore, silica, coke are pressed into the dispensing of table 1, it is well mixed to obtain compound, wherein, compound
Middle MgO and Al2O3Mass ratio be 1.3；
The dispensing detail list of 7 embodiment of table 4
(2) compound adds mineral hot furnace through tremie pipe, and as the sinking of furnace charge in stove supplements virgin material in time, to keep expecting
Face is concordant with fire door；
(3) in smelting process, in-furnace temperature is controlled at 1650~1700 DEG C, interval goes out an iron, molten iron in 2~3 hours
Released simultaneously from tapping hole with clinker；
(4) molten iron casts after skimming, is granulated and obtains high carbon ferro-chrome, and high carbon ferro-chrome composition is shown in Table 8：
The alloying component table of 8 embodiment of table 4
Through measuring and calculating, 1 ton of 420 yuan lower than powder mine sintering or pellet forming process or so of high carbon ferro-chrome is produced, economic benefit is obvious.
Four embodiments of the above are all by MgO/Al2O3Ratio control is in the zone of reasonableness of setting, smelting process furnace charge 1
Form in molten bath 2 is in as shown in Figure 1 flat, is produced a desired effect.
Claims (3)
1. a kind of method that chromite ore fine directly enters stove smelting high carbon ferrochrome, it is characterised in that：Comprise the following steps：
（1）Chromite ore fine, chromium lump ore, silica, coke are well mixed and obtain compound, MgO and Al in compound2O3Mass ratio
For 0.8 ~ 1.3；
（2）Mineral hot furnace is added mixture into, and as the sinking of furnace charge in stove supplements virgin material in time, keeps charge level to be put down with fire door
Together；
（3）In smelting process, in-furnace temperature is controlled at 1650~1700 DEG C, interval goes out an iron in 2~3 hours；
（4）Molten iron casts after skimming, is granulated and obtains high carbon ferro-chrome.
2. the method that chromite ore fine according to claim 1 directly enters stove smelting high carbon ferrochrome, it is characterised in that：Chromite ore fine
Granularity is less than 2mm, and the granularity of coke is 15 ~ 30mm, and the granularity of silica is 20 ~ 60mm.
3. the method that chromite ore fine according to claim 1 directly enters stove smelting high carbon ferrochrome, it is characterised in that：Step（1）
Per 750~850kg of 1000kg chromite ore fines collocation chromium lump ore, 100~150kg of silica, 210~230kg of coke in compound.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710533344.2A CN107385213A (en) | 2017-07-03 | 2017-07-03 | A kind of method that chromite ore fine directly enters stove smelting high carbon ferrochrome |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710533344.2A CN107385213A (en) | 2017-07-03 | 2017-07-03 | A kind of method that chromite ore fine directly enters stove smelting high carbon ferrochrome |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| PL425299A1 (en) * | 2018-04-20 | 2019-10-21 | Pedmo Spółka Akcyjna | Powder backfill for slide locks and method for producing them |
| CN111876592A (en) * | 2020-08-06 | 2020-11-03 | 徐州宏阳新材料科技有限公司 | Environment-friendly ferrochrome smelting furnace burden and preparation method thereof |
| CN112029995A (en) * | 2020-08-09 | 2020-12-04 | 徐州宏阳新材料科技有限公司 | Method for smelting ferrochrome by using ore-smelting furnace added with silica |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1035137A (en) * | 1988-02-06 | 1989-08-30 | 东北工学院 | Method with the top and bottom combined blown converter smelting extra low carbon ferrochromium |
| CN101608261A (en) * | 2009-06-28 | 2009-12-23 | 杨国尧 | The method of producing high carbon ferro-chrome by using chromite powder |
| CN104294002A (en) * | 2014-10-23 | 2015-01-21 | 北京科技大学 | Method for smelting medium- and low-carbon ferrochromium by introducing one-step method of carbon dioxide converter |
-
2017
- 2017-07-03 CN CN201710533344.2A patent/CN107385213A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1035137A (en) * | 1988-02-06 | 1989-08-30 | 东北工学院 | Method with the top and bottom combined blown converter smelting extra low carbon ferrochromium |
| CN101608261A (en) * | 2009-06-28 | 2009-12-23 | 杨国尧 | The method of producing high carbon ferro-chrome by using chromite powder |
| CN104294002A (en) * | 2014-10-23 | 2015-01-21 | 北京科技大学 | Method for smelting medium- and low-carbon ferrochromium by introducing one-step method of carbon dioxide converter |
Non-Patent Citations (1)
| Title |
|---|
| 刘岩等著: "《转炉铬矿熔融还原法不锈钢直接合金化技术》", 31 March 2009 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| PL425299A1 (en) * | 2018-04-20 | 2019-10-21 | Pedmo Spółka Akcyjna | Powder backfill for slide locks and method for producing them |
| CN111876592A (en) * | 2020-08-06 | 2020-11-03 | 徐州宏阳新材料科技有限公司 | Environment-friendly ferrochrome smelting furnace burden and preparation method thereof |
| CN112029995A (en) * | 2020-08-09 | 2020-12-04 | 徐州宏阳新材料科技有限公司 | Method for smelting ferrochrome by using ore-smelting furnace added with silica |
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