CN101608261A - The method of producing high carbon ferro-chrome by using chromite powder - Google Patents

The method of producing high carbon ferro-chrome by using chromite powder Download PDF

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Publication number
CN101608261A
CN101608261A CNA200910117344XA CN200910117344A CN101608261A CN 101608261 A CN101608261 A CN 101608261A CN A200910117344X A CNA200910117344X A CN A200910117344XA CN 200910117344 A CN200910117344 A CN 200910117344A CN 101608261 A CN101608261 A CN 101608261A
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Prior art keywords
ore
chrome
pelletizing
ore deposit
carbon ferro
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CNA200910117344XA
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Chinese (zh)
Inventor
杨国尧
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杨国尧
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Publication of CN101608261A publication Critical patent/CN101608261A/en

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Abstract

The invention discloses a kind of method of using single chromium powder ore deposit to produce high carbon ferro-chrome.The present invention includes the following step: single chromium powder ore deposit and binding agent and slag former are carried out mix, cold pressing and make ball, making the ball time is 10~15 minutes, the pelletizing that causes is sieved separation, qualified pelletizing is that finished product is put in storage, use to be produced, and the meal that sifts out simultaneously reclaims and returns batch mixing, to be finished pellet behind the pelletizing natural air drying of making, finished pellet and solvent, reductive agent directly add the hot stove in ore deposit produce high carbon ferro-chrome.The present invention utilizes 100% single fine ore, and slag making in advance directly enters the hot stove in ore deposit and produces high carbon ferro-chrome, need be with addition of chromium lump ore or other fine ore.Bring very big facility to production, improved the production electric furnace working of a furnace, improved productivity, reduced product cost, technology is simple, has promptly solved resource problem, satisfied the requirement of producing again, and productive capacity is improved.The purposes prospect is extensive.

Description

The method of producing high carbon ferro-chrome by using chromite powder
Technical field
The present invention relates to the method for producing high carbon ferro-chrome by using chromite powder.
Background technology
At present, because the scarcity of resources and the price of chromium lump ore are higher, cause production cost higher.Though the price in chromium powder ore deposit is lower, all use fine ore to produce high carbon ferro-chrome, then the electric furnace ventilation property is poor, causes that the working of a furnace worsens, productive capacity is poor.
Traditional method has only solved fine ore and has made the strength problem of ball, so must arrange in pairs or groups with other lump ore in using, and it is required to satisfy production.Because, then be difficult to adjust slag composition, thereby greatly reduce the rate of recovery of chromium element if all use fine ore.Therefore, general high carbon ferro-chrome production method is to adopt different lump ore collocation fine ores or fine ore is made the use of ball collocation lump ore now.
Summary of the invention
The purpose of this invention is to provide a kind of method of using single chromium powder ore deposit to produce high carbon ferro-chrome.
The present invention includes the following step:
(1) single chromium powder ore deposit and binding agent and slag former are carried out mix, the weight percentage in chromium powder ore deposit is 90~96%, the weight percentage of binding agent and slag former is 4~10%, binding agent is classified 4: 6 as with the ratio of slag former, binding agent is that bath of glass and wilkinite mix, bath of glass and bentonitic ratio are classified 4: 6 as, and slag former is a kind of in silicon powder, ferrochrome dedusting dust, magnesia powder or the quartz sand powder
(2) batching that will mix is delivered to pelletizer through belt and colds pressing and make ball, and making the ball time is 10~15 minutes,
(3) pelletizing that causes is sieved separation, qualified pelletizing is that finished product is put in storage, use to be produced, and the meal that sifts out simultaneously reclaims and returns batch mixing,
(4) will be finished pellet behind the pelletizing natural air drying of making,
(5) finished pellet and solvent, reductive agent directly add the hot stove in ore deposit produce high carbon ferro-chrome, solvent is silica and rhombspar, reductive agent is a coke, every 1000Kg finished pellet is with addition of silica 30~40Kg, with addition of rhombspar 10~20Kg, with addition of coke 250~300Kg.
It is chrome ore, alloy Jiao that high carbon ferro-chrome is produced main raw material(s).Chrome ore is a lump ore, sometimes for some fine ores of collocation that reduce cost.In high carbon ferro-chrome was produced, different mineral collocation were used, be for:
(1) improves Gr in the chrome ore 2O 3Content and slag iron ratio;
(2) adjust SiO in the slag 2, Al 2O 3, MgO content, the slag composition that guarantee to produce needs;
(3) adjust furnace charge air permeability;
(4) reduce the raw material use cost.
Therefore, according to producing needs, in order to guarantee SiO suitable in the slag 2, Al 2O 3, MgO content (SiO in the slag 2Content should be 30~36%, MgO, Al in the slag 2O 3Total amount should be 56~60%).
Use different mineral to produce high carbon ferro-chrome, there are the following problems:
(1) every kind of ore deposit all needs independent stockyard,
(2) since every kind of ore deposit from country variant or area, laboratory reagent consumes high;
(3), the charge proportioning is influenced greatly (changing frequent as mixed carbon comtent) because the composition fluctuation is big;
(4) frequently change proportioning, easily operation brings disadvantageous effect to the working of a furnace.As easily fluctuating because of mixed carbon comtent changes secondary current, electrode is difficult for dark slotting, operational difficulty;
(5) the each adjustment of charge, the variation that all can bring the quantity of slag had not only influenced the recovery rate of chromium but also had influenced the subsequent disposal of chromium slag.
It is higher to the present invention is directed to chromium lump ore shortage of resources and price, and the present situation that the fine ore resource is many, the lump ore resource is few is utilized 100% single fine ore, and slag making in advance directly enters the hot stove in ore deposit and produces high carbon ferro-chrome, need be with addition of chromium lump ore or other fine ore.Therefore the problems referred to above are all solved, and bring very big facility to production, have improved the production electric furnace working of a furnace, improved productivity, reduced product cost, technology is simple, promptly solved resource problem, satisfied the requirement of producing again, and productive capacity has been improved.The purposes prospect is extensive.
The emphasis that the present invention makes the ball way is: both guaranteed the intensity of pelletizing, fundamentally solved the problem that single fine ore can not residue adjustment of using again.
Chromite ore fine of the present invention is colded pressing and is made the average composition Cr of pelletizing thing that chromite ore fine is made behind the ball 2O 3Be 41.5%, make the preceding average composition 45% of ball and descend about 3.5 percentage points, but use in industrial production that chromium is that much variations do not take place the product power consumption, makes furnace operation easy on the contrary.Simultaneously, after coal-pressing ball added electric furnace, its hot strength had improved (see figure 3).
Description of drawings
Fig. 1 is the process flow sheet that fine ore of the present invention is produced high carbon ferro-chrome;
Fig. 2 is the cold pressing strength figure of finished pellet of the present invention;
Fig. 3 is the hot strength figure of finished pellet of the present invention.
Embodiment
The following examples can make those skilled in the art more fully understand the present invention, but do not limit the present invention in any way.
Embodiment 1
(1) 1980 kilograms production is carried out mix with chromite ore fine and 35 kilograms of baths of glass and 53 kilograms of wilkinites, 132 kilograms of silicon powders,
(2) batching that will mix is delivered to pelletizer through belt and colds pressing and make ball, and making the ball time is 10~15 minutes,
(3) pelletizing that causes is sieved separation, qualified pelletizing is that finished product is put in storage, use to be produced, and the meal that sifts out simultaneously reclaims and returns batch mixing,
(4) will be finished pellet behind the pelletizing natural air drying of making,
(5) 2200 kilograms of finished pellets and 77Kg silica, 20Kg rhombspar, 660 kg coke directly add the hot stove in ore deposit and produce high carbon ferro-chrome.
Embodiment 2
(1) 2090Kg produces with chromite ore fine and 18 kilograms of baths of glass and 26 kilograms of wilkinites, 66Kg ferrochrome dedusting dust and carries out mix,
(2) batching that will mix is delivered to pelletizer through belt and colds pressing and make ball, and making the ball time is 13 minutes,
(3) pelletizing that causes is sieved separation, qualified pelletizing is that finished product is put in storage, use to be produced, and the meal that sifts out simultaneously reclaims and returns batch mixing,
(4) will be finished pellet (2200 kilograms) behind the pelletizing natural air drying of making,
(5) 2200 kilograms of finished pellets, directly add the hot stove in ore deposit with 83.6Kg silica, 26.4Kg rhombspar, 520Kg coke and produce high carbon ferro-chrome.
Embodiment 3
(1) 2046Kg is produced with chromite ore fine and 25 kilograms of baths of glass and 37 kilograms of wilkinites, 92Kg magnesia powders and carries out mix,
(2) batching that will mix is delivered to pelletizer through belt and colds pressing and make ball, and making the ball time is 14 minutes,
(3) pelletizing that causes is sieved separation, qualified pelletizing is that finished product is put in storage, use to be produced, and the meal that sifts out simultaneously reclaims and returns batch mixing,
(4) will be finished pellet (2200 kilograms) behind the pelletizing natural air drying of making,
(5) 2200Kg finished pellet and 88Kg silica, 33Kg rhombspar, 530Kg reductive agent are directly added the hot stove production in ore deposit high carbon ferro-chrome,
Embodiment 4
(1) 2046Kg is produced with chromite ore fine and 25 kilograms of baths of glass and 37 kilograms of wilkinites, 92Kg quartz sand powders and carries out mix,
(2) batching that will mix is delivered to pelletizer through belt and colds pressing and make ball, and making the ball time is 15 minutes,
(3) pelletizing that causes is sieved separation, qualified pelletizing is that finished product is put in storage, use to be produced, and the meal that sifts out simultaneously reclaims and returns batch mixing,
(4) will be finished pellet (2200 kilograms) behind the pelletizing natural air drying of making,
(5) 2200Kg finished pellet and 66Kg silica, 44Kg rhombspar, 550Kg reductive agent are directly added the hot stove production in ore deposit high carbon ferro-chrome.
The present invention and the contrast of traditional high carbon ferro-chrome production method are as follows
1) material condition
The raw material that tradition high carbon ferro-chrome production method is used is:
Tibet chromium lump ore: Gr 2O 3=46% granularity 5~50mm,
Turkey's chromium lump ore: Gr 2O 3=42% granularity 5~50mm,
Turkey chromium powder ore deposit: Gr 2O 3=46%;
Reductive agent coke of the present invention: C Gu=82% volatile matter=10% ash content=8% moisture=10% granularity, 5~20mm; Solvent silica: SiO 2=97.5% granularity 30~100mm;
The raw material that the present invention uses is that the chromium powder ore deposit is made ball and become chromium pelletizing: Gr 2O 3=43.5% granularity 25~40mm.
2) electric furnace parameter
Transformer: rated capacity 6300KVA
Primary voltage 35KV
Common voltage 112V
Rated current 32500A
Voltage regulating mode is a No-load changer
Electrode diameter: 800mm
Utmost point heart garden diameter: 1900mm
Furnace diameter: 4600mm
Furnace depth: 1900mm
Furnace shell diameter: 6300mm
Furnace shell height: 3700mm
3) productive capacity
Chromium lump ore, the collocation of chromium powder ore deposit are adopted in the production of tradition high carbon ferro-chrome.For easy operation, generally speaking, the ratio of fine ore and the chrome ore piece amount of allocating into is 30% :/70% to the maximum, the production cost height, and the chromium element loss is big, sees (table 1) for details.
Table 1 traditional method chromite ore fine, chromium lump ore cooperate smelting high carbon ferrochrome index
Product specification The chromite ore fine amount of allocating into (%) The lump ore amount of allocating into (%) Output (t/ days) Chromium element recovery rate (%) Unit power consumption (kwh/t)
FeCr 67C 6.0 30 70 ???44.78 93.85 3460
Annotate: this table data in July, 2007 is one month average data of ordinary production
Adopt the present invention's technology, all use and make fine ore behind the ball, technical indicator is as shown in table 2.
Table 2 the present invention uses productive capacity behind the fine ore
Product specification The coal-pressing ball amount of allocating into The lump ore amount of allocating into (%) Output (t/ days) Chromium element recovery rate (%) Unit power consumption (kwh/t)
FeCr 67C 6.0 100 0 ??45.87 94.57 3395
Annotate: this table data are 2 months average data of 8-9 ordinary production in 2007
4) produce analysis
4.1 cost of material:
Conventional production methods cost of material: Tibet chromium lump ore: 45 yuan of/ton degree, Turkey's chromium lump ore: 48 yuan of/ton degree, Turkey chromium powder ore deposit: 44 yuan of/ton degree.
Production method cost of material of the present invention: pelletizing chrome ore: 45 yuan of/ton degree
4.2 produce the chrome ore consumption and the power consumption of one ton of product:
(1), traditional method uses lump ore and fine ore to produce the calculating of high carbon ferro-chrome unit cost:
One ton of FeCr of every production 67C 6.0Need the raw ore amount to be:
1000Kg * products C r content ÷ Cr recovery rate * (Gr 2O 3Nucleidic mass ÷ Gr 2O 3Middle Cr amount) ÷ raw ore average grade=1000 * 0.67 ÷, 93.85% * 152/104 ÷ 44.6%=2339 (kg)
The raw ore cost is:
Ore deposit consumption * (each ore deposit is with addition of amount * each ore deposit price unit/degree ton) * raw ore Gr 2O 3Measure=2.339 tons * (30% * 44 yuan/degree ton+35% * 45 yuan/degree ton+35% * 48 yuan/degree ton) * 44.6%/ton=4772 (units)
Electrisity consumption is:
Product unit power consumption KWH/ ton * electricity price unit/KWH=3460KWH/ ton * 0.35 yuan/KWH=1211 (unit)
Cost accounting is (only considering ore deposit valency and electricity price):
4772 (unit)+1211 (unit)=5983 (unit)
(2), the present invention uses the chromium powder ore deposit to produce the calculating of high carbon ferro-chrome unit cost:
One ton of FeCr of every production 67C 6.0Need the raw ore amount to be:
1000Kg * products C r content ÷ Cr recovery rate * (Gr 2O 3Nucleidic mass ÷ Gr 2O 3Middle Cr amount) ÷ raw ore average grade=1000 * 0.670 ÷, 94.57% * 152/104 ÷ 43.5%=2380 (kg)
The raw ore cost is: ore deposit consumption * (each ore deposit is with addition of amount * each ore deposit price unit/degree ton) * raw ore Gr 2O 3Amount=2.339 * 45 * 44.6=4694 (unit)
Electrisity consumption is:
Product unit power consumption KWH/ ton * electricity price unit/KWH
3395KWH/ ton * 0.35 yuan/KWH=1188 (unit)
Cost accounting is (only considering ore deposit valency and electricity price):
4694 (unit)+1188 (unit)=5882 (unit)
(3), it is lower than using lump ore and fine ore to produce to use 100% chromium powder ore deposit production cost:
(4772+1211)-(4694+1188)=101 (unit)
5, conclusion
(1) to use 100% fine ore to produce high carbon ferro-chrome feasible fully in the present invention.
(2) one of emphasis of the present invention is to adopt with addition of slag former to produce pelletizing.And the pelletizing of other explained hereafter can't resolve the residue adjustment problem at all, and the lump ore of must arranging in pairs or groups could be produced high carbon ferro-chrome.
(3) another emphasis of the present invention is, whole high carbon ferro-chrome production technique is improved and simplified, and has improved output and has reduced production cost, remarkable benefit.
In the embodiment of the present invention, the shaping thing is the pelletizing shape.The pelletizing of making of colding pressing is of a size of 25~40mm, and the pelletizing that makes is after solidifying, and cold strength reaches the above (see figure 2) of 15 MPas.
Chromite ore fine of the present invention is colded pressing and is made the average composition Cr of pelletizing thing that chromite ore fine is made behind the ball 2O 3Be 41.5%, make the preceding average composition 45% of ball and descend about 3.5 percentage points, but use in industrial production that chromium is that much variations do not take place the product power consumption, makes furnace operation easy on the contrary.Simultaneously, after coal-pressing ball added electric furnace, its hot strength had improved (see figure 3).

Claims (1)

1, a kind of method of producing high carbon ferro-chrome by using chromite powder is characterized in that it comprises the following steps:
(1) single chromium powder ore deposit and binding agent and slag former are carried out mix, the weight percentage in chromium powder ore deposit is 90~96%, the weight percentage of binding agent and slag former is 4~10%, binding agent is classified 4: 6 as with the ratio of slag former, binding agent is that bath of glass and wilkinite mix, bath of glass and bentonitic ratio are classified 4: 6 as, and slag former is a kind of in silicon powder, ferrochrome dedusting dust, magnesia powder or the quartz sand powder
(2) batching that will mix is delivered to pelletizer through belt and colds pressing and make ball, and making the ball time is 10~15 minutes,
(3) pelletizing that causes is sieved separation, qualified pelletizing is that finished product is put in storage, use to be produced, and the meal that sifts out simultaneously reclaims and returns batch mixing,
(4) will be finished pellet behind the pelletizing natural air drying of making,
(5) finished pellet and solvent, reductive agent directly add the hot stove in ore deposit produce high carbon ferro-chrome, solvent is silica and rhombspar, reductive agent is a coke, every 1000Kg finished pellet is with addition of silica 30~40Kg, with addition of rhombspar 10~20Kg, with addition of coke 250~300Kg.
CNA200910117344XA 2009-06-28 2009-06-28 The method of producing high carbon ferro-chrome by using chromite powder CN101608261A (en)

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101962714A (en) * 2010-10-25 2011-02-02 中钢集团吉林铁合金股份有限公司 Production method of low-silicon low-titanium and high-carbon ferrochrome smelted by submerged arc furnace
CN102051474A (en) * 2010-12-17 2011-05-11 兰州三普电力有限公司 Cr-Fe powder ore cold-hardened pellet binder and process for pelleting by using same
CN103436694A (en) * 2013-09-04 2013-12-11 宁夏天元锰业有限公司 Method for preparing chrome ore pellets
CN103468943A (en) * 2013-09-27 2013-12-25 中信大锰(钦州)新材料有限公司 Cold-pressing pallet production process of chromium fine ore
CN104451131A (en) * 2015-01-09 2015-03-25 山东鑫海科技股份有限公司 Powder chrome ore reducing sintering agglomeration technique
CN106048213A (en) * 2016-08-25 2016-10-26 青海金广镍铬材料有限公司 Method for smelting high carbon ferro-chrome containing nickel from chlorite powder sinter
CN106521148A (en) * 2016-12-01 2017-03-22 中冶东方工程技术有限公司 Method for preparing high carbon ferro-chrome by fusible chrome fine ore
CN107267854A (en) * 2017-06-19 2017-10-20 徐州宏阳新材料科技有限公司 The smelting process and product of a kind of high carbon ferro-chrome
CN107385213A (en) * 2017-07-03 2017-11-24 江苏省冶金设计院有限公司 A kind of method that chromite ore fine directly enters stove smelting high carbon ferrochrome
CN108977621A (en) * 2018-08-02 2018-12-11 山东济钢合金材料科技有限公司 A kind of smelting process of high carbon ferro-chrome
CN109136440A (en) * 2018-08-06 2019-01-04 万国雄 A kind of high carbon ferro-chrome composition and its smelting process
CN110055453A (en) * 2019-05-24 2019-07-26 丰镇市新太新材料科技有限公司 A kind of smelting process of closed open arc electric furnace high carbon ferro-chrome
CN110218865A (en) * 2019-06-04 2019-09-10 甘肃酒钢集团宏兴钢铁股份有限公司 A kind of processing method of ferrochrome mineral hot furnace dedusting ash

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101962714A (en) * 2010-10-25 2011-02-02 中钢集团吉林铁合金股份有限公司 Production method of low-silicon low-titanium and high-carbon ferrochrome smelted by submerged arc furnace
CN102051474A (en) * 2010-12-17 2011-05-11 兰州三普电力有限公司 Cr-Fe powder ore cold-hardened pellet binder and process for pelleting by using same
CN102051474B (en) * 2010-12-17 2012-03-21 兰州三普电力有限公司 Cr-Fe powder ore cold-hardened pellet binder and process for pelleting by using same
CN103436694A (en) * 2013-09-04 2013-12-11 宁夏天元锰业有限公司 Method for preparing chrome ore pellets
CN103468943A (en) * 2013-09-27 2013-12-25 中信大锰(钦州)新材料有限公司 Cold-pressing pallet production process of chromium fine ore
CN104451131A (en) * 2015-01-09 2015-03-25 山东鑫海科技股份有限公司 Powder chrome ore reducing sintering agglomeration technique
CN106048213A (en) * 2016-08-25 2016-10-26 青海金广镍铬材料有限公司 Method for smelting high carbon ferro-chrome containing nickel from chlorite powder sinter
CN106521148A (en) * 2016-12-01 2017-03-22 中冶东方工程技术有限公司 Method for preparing high carbon ferro-chrome by fusible chrome fine ore
CN107267854A (en) * 2017-06-19 2017-10-20 徐州宏阳新材料科技有限公司 The smelting process and product of a kind of high carbon ferro-chrome
CN107385213A (en) * 2017-07-03 2017-11-24 江苏省冶金设计院有限公司 A kind of method that chromite ore fine directly enters stove smelting high carbon ferrochrome
CN108977621A (en) * 2018-08-02 2018-12-11 山东济钢合金材料科技有限公司 A kind of smelting process of high carbon ferro-chrome
CN109136440A (en) * 2018-08-06 2019-01-04 万国雄 A kind of high carbon ferro-chrome composition and its smelting process
CN110055453A (en) * 2019-05-24 2019-07-26 丰镇市新太新材料科技有限公司 A kind of smelting process of closed open arc electric furnace high carbon ferro-chrome
CN110218865A (en) * 2019-06-04 2019-09-10 甘肃酒钢集团宏兴钢铁股份有限公司 A kind of processing method of ferrochrome mineral hot furnace dedusting ash

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Open date: 20091223